#include "../cache.h"
+#include "../config.h"
#include "../refs.h"
#include "refs-internal.h"
+#include "ref-cache.h"
+#include "packed-backend.h"
+#include "../iterator.h"
+#include "../dir-iterator.h"
#include "../lockfile.h"
#include "../object.h"
#include "../dir.h"
struct ref_lock {
char *ref_name;
- char *orig_ref_name;
struct lock_file *lk;
struct object_id old_oid;
};
-struct ref_entry;
-
-/*
- * Information used (along with the information in ref_entry) to
- * describe a single cached reference. This data structure only
- * occurs embedded in a union in struct ref_entry, and only when
- * (ref_entry->flag & REF_DIR) is zero.
- */
-struct ref_value {
- /*
- * The name of the object to which this reference resolves
- * (which may be a tag object). If REF_ISBROKEN, this is
- * null. If REF_ISSYMREF, then this is the name of the object
- * referred to by the last reference in the symlink chain.
- */
- struct object_id oid;
-
- /*
- * If REF_KNOWS_PEELED, then this field holds the peeled value
- * of this reference, or null if the reference is known not to
- * be peelable. See the documentation for peel_ref() for an
- * exact definition of "peelable".
- */
- struct object_id peeled;
-};
-
-struct ref_cache;
-
-/*
- * Information used (along with the information in ref_entry) to
- * describe a level in the hierarchy of references. This data
- * structure only occurs embedded in a union in struct ref_entry, and
- * only when (ref_entry.flag & REF_DIR) is set. In that case,
- * (ref_entry.flag & REF_INCOMPLETE) determines whether the references
- * in the directory have already been read:
- *
- * (ref_entry.flag & REF_INCOMPLETE) unset -- a directory of loose
- * or packed references, already read.
- *
- * (ref_entry.flag & REF_INCOMPLETE) set -- a directory of loose
- * references that hasn't been read yet (nor has any of its
- * subdirectories).
- *
- * Entries within a directory are stored within a growable array of
- * pointers to ref_entries (entries, nr, alloc). Entries 0 <= i <
- * sorted are sorted by their component name in strcmp() order and the
- * remaining entries are unsorted.
- *
- * Loose references are read lazily, one directory at a time. When a
- * directory of loose references is read, then all of the references
- * in that directory are stored, and REF_INCOMPLETE stubs are created
- * for any subdirectories, but the subdirectories themselves are not
- * read. The reading is triggered by get_ref_dir().
- */
-struct ref_dir {
- int nr, alloc;
-
- /*
- * Entries with index 0 <= i < sorted are sorted by name. New
- * entries are appended to the list unsorted, and are sorted
- * only when required; thus we avoid the need to sort the list
- * after the addition of every reference.
- */
- int sorted;
-
- /* A pointer to the ref_cache that contains this ref_dir. */
- struct ref_cache *ref_cache;
-
- struct ref_entry **entries;
-};
-
-/*
- * Bit values for ref_entry::flag. REF_ISSYMREF=0x01,
- * REF_ISPACKED=0x02, REF_ISBROKEN=0x04 and REF_BAD_NAME=0x08 are
- * public values; see refs.h.
- */
-
-/*
- * The field ref_entry->u.value.peeled of this value entry contains
- * the correct peeled value for the reference, which might be
- * null_sha1 if the reference is not a tag or if it is broken.
- */
-#define REF_KNOWS_PEELED 0x10
-
-/* ref_entry represents a directory of references */
-#define REF_DIR 0x20
-
-/*
- * Entry has not yet been read from disk (used only for REF_DIR
- * entries representing loose references)
- */
-#define REF_INCOMPLETE 0x40
-
-/*
- * A ref_entry represents either a reference or a "subdirectory" of
- * references.
- *
- * Each directory in the reference namespace is represented by a
- * ref_entry with (flags & REF_DIR) set and containing a subdir member
- * that holds the entries in that directory that have been read so
- * far. If (flags & REF_INCOMPLETE) is set, then the directory and
- * its subdirectories haven't been read yet. REF_INCOMPLETE is only
- * used for loose reference directories.
- *
- * References are represented by a ref_entry with (flags & REF_DIR)
- * unset and a value member that describes the reference's value. The
- * flag member is at the ref_entry level, but it is also needed to
- * interpret the contents of the value field (in other words, a
- * ref_value object is not very much use without the enclosing
- * ref_entry).
- *
- * Reference names cannot end with slash and directories' names are
- * always stored with a trailing slash (except for the top-level
- * directory, which is always denoted by ""). This has two nice
- * consequences: (1) when the entries in each subdir are sorted
- * lexicographically by name (as they usually are), the references in
- * a whole tree can be generated in lexicographic order by traversing
- * the tree in left-to-right, depth-first order; (2) the names of
- * references and subdirectories cannot conflict, and therefore the
- * presence of an empty subdirectory does not block the creation of a
- * similarly-named reference. (The fact that reference names with the
- * same leading components can conflict *with each other* is a
- * separate issue that is regulated by verify_refname_available().)
- *
- * Please note that the name field contains the fully-qualified
- * reference (or subdirectory) name. Space could be saved by only
- * storing the relative names. But that would require the full names
- * to be generated on the fly when iterating in do_for_each_ref(), and
- * would break callback functions, who have always been able to assume
- * that the name strings that they are passed will not be freed during
- * the iteration.
- */
-struct ref_entry {
- unsigned char flag; /* ISSYMREF? ISPACKED? */
- union {
- struct ref_value value; /* if not (flags&REF_DIR) */
- struct ref_dir subdir; /* if (flags&REF_DIR) */
- } u;
- /*
- * The full name of the reference (e.g., "refs/heads/master")
- * or the full name of the directory with a trailing slash
- * (e.g., "refs/heads/"):
- */
- char name[FLEX_ARRAY];
-};
-
-static void read_loose_refs(const char *dirname, struct ref_dir *dir);
-static int search_ref_dir(struct ref_dir *dir, const char *refname, size_t len);
-static struct ref_entry *create_dir_entry(struct ref_cache *ref_cache,
- const char *dirname, size_t len,
- int incomplete);
-static void add_entry_to_dir(struct ref_dir *dir, struct ref_entry *entry);
-
-static struct ref_dir *get_ref_dir(struct ref_entry *entry)
-{
- struct ref_dir *dir;
- assert(entry->flag & REF_DIR);
- dir = &entry->u.subdir;
- if (entry->flag & REF_INCOMPLETE) {
- read_loose_refs(entry->name, dir);
-
- /*
- * Manually add refs/bisect, which, being
- * per-worktree, might not appear in the directory
- * listing for refs/ in the main repo.
- */
- if (!strcmp(entry->name, "refs/")) {
- int pos = search_ref_dir(dir, "refs/bisect/", 12);
- if (pos < 0) {
- struct ref_entry *child_entry;
- child_entry = create_dir_entry(dir->ref_cache,
- "refs/bisect/",
- 12, 1);
- add_entry_to_dir(dir, child_entry);
- read_loose_refs("refs/bisect",
- &child_entry->u.subdir);
- }
- }
- entry->flag &= ~REF_INCOMPLETE;
- }
- return dir;
-}
-
-static struct ref_entry *create_ref_entry(const char *refname,
- const unsigned char *sha1, int flag,
- int check_name)
-{
- struct ref_entry *ref;
-
- if (check_name &&
- check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
- die("Reference has invalid format: '%s'", refname);
- FLEX_ALLOC_STR(ref, name, refname);
- hashcpy(ref->u.value.oid.hash, sha1);
- oidclr(&ref->u.value.peeled);
- ref->flag = flag;
- return ref;
-}
-
-static void clear_ref_dir(struct ref_dir *dir);
-
-static void free_ref_entry(struct ref_entry *entry)
-{
- if (entry->flag & REF_DIR) {
- /*
- * Do not use get_ref_dir() here, as that might
- * trigger the reading of loose refs.
- */
- clear_ref_dir(&entry->u.subdir);
- }
- free(entry);
-}
-
-/*
- * Add a ref_entry to the end of dir (unsorted). Entry is always
- * stored directly in dir; no recursion into subdirectories is
- * done.
- */
-static void add_entry_to_dir(struct ref_dir *dir, struct ref_entry *entry)
-{
- ALLOC_GROW(dir->entries, dir->nr + 1, dir->alloc);
- dir->entries[dir->nr++] = entry;
- /* optimize for the case that entries are added in order */
- if (dir->nr == 1 ||
- (dir->nr == dir->sorted + 1 &&
- strcmp(dir->entries[dir->nr - 2]->name,
- dir->entries[dir->nr - 1]->name) < 0))
- dir->sorted = dir->nr;
-}
-
/*
- * Clear and free all entries in dir, recursively.
- */
-static void clear_ref_dir(struct ref_dir *dir)
-{
- int i;
- for (i = 0; i < dir->nr; i++)
- free_ref_entry(dir->entries[i]);
- free(dir->entries);
- dir->sorted = dir->nr = dir->alloc = 0;
- dir->entries = NULL;
-}
-
-/*
- * Create a struct ref_entry object for the specified dirname.
- * dirname is the name of the directory with a trailing slash (e.g.,
- * "refs/heads/") or "" for the top-level directory.
+ * Future: need to be in "struct repository"
+ * when doing a full libification.
*/
-static struct ref_entry *create_dir_entry(struct ref_cache *ref_cache,
- const char *dirname, size_t len,
- int incomplete)
-{
- struct ref_entry *direntry;
- FLEX_ALLOC_MEM(direntry, name, dirname, len);
- direntry->u.subdir.ref_cache = ref_cache;
- direntry->flag = REF_DIR | (incomplete ? REF_INCOMPLETE : 0);
- return direntry;
-}
+struct files_ref_store {
+ struct ref_store base;
+ unsigned int store_flags;
-static int ref_entry_cmp(const void *a, const void *b)
-{
- struct ref_entry *one = *(struct ref_entry **)a;
- struct ref_entry *two = *(struct ref_entry **)b;
- return strcmp(one->name, two->name);
-}
+ char *gitdir;
+ char *gitcommondir;
-static void sort_ref_dir(struct ref_dir *dir);
+ struct ref_cache *loose;
-struct string_slice {
- size_t len;
- const char *str;
+ struct ref_store *packed_ref_store;
};
-static int ref_entry_cmp_sslice(const void *key_, const void *ent_)
+static void clear_loose_ref_cache(struct files_ref_store *refs)
{
- const struct string_slice *key = key_;
- const struct ref_entry *ent = *(const struct ref_entry * const *)ent_;
- int cmp = strncmp(key->str, ent->name, key->len);
- if (cmp)
- return cmp;
- return '\0' - (unsigned char)ent->name[key->len];
-}
-
-/*
- * Return the index of the entry with the given refname from the
- * ref_dir (non-recursively), sorting dir if necessary. Return -1 if
- * no such entry is found. dir must already be complete.
- */
-static int search_ref_dir(struct ref_dir *dir, const char *refname, size_t len)
-{
- struct ref_entry **r;
- struct string_slice key;
-
- if (refname == NULL || !dir->nr)
- return -1;
-
- sort_ref_dir(dir);
- key.len = len;
- key.str = refname;
- r = bsearch(&key, dir->entries, dir->nr, sizeof(*dir->entries),
- ref_entry_cmp_sslice);
-
- if (r == NULL)
- return -1;
-
- return r - dir->entries;
-}
-
-/*
- * Search for a directory entry directly within dir (without
- * recursing). Sort dir if necessary. subdirname must be a directory
- * name (i.e., end in '/'). If mkdir is set, then create the
- * directory if it is missing; otherwise, return NULL if the desired
- * directory cannot be found. dir must already be complete.
- */
-static struct ref_dir *search_for_subdir(struct ref_dir *dir,
- const char *subdirname, size_t len,
- int mkdir)
-{
- int entry_index = search_ref_dir(dir, subdirname, len);
- struct ref_entry *entry;
- if (entry_index == -1) {
- if (!mkdir)
- return NULL;
- /*
- * Since dir is complete, the absence of a subdir
- * means that the subdir really doesn't exist;
- * therefore, create an empty record for it but mark
- * the record complete.
- */
- entry = create_dir_entry(dir->ref_cache, subdirname, len, 0);
- add_entry_to_dir(dir, entry);
- } else {
- entry = dir->entries[entry_index];
- }
- return get_ref_dir(entry);
-}
-
-/*
- * If refname is a reference name, find the ref_dir within the dir
- * tree that should hold refname. If refname is a directory name
- * (i.e., ends in '/'), then return that ref_dir itself. dir must
- * represent the top-level directory and must already be complete.
- * Sort ref_dirs and recurse into subdirectories as necessary. If
- * mkdir is set, then create any missing directories; otherwise,
- * return NULL if the desired directory cannot be found.
- */
-static struct ref_dir *find_containing_dir(struct ref_dir *dir,
- const char *refname, int mkdir)
-{
- const char *slash;
- for (slash = strchr(refname, '/'); slash; slash = strchr(slash + 1, '/')) {
- size_t dirnamelen = slash - refname + 1;
- struct ref_dir *subdir;
- subdir = search_for_subdir(dir, refname, dirnamelen, mkdir);
- if (!subdir) {
- dir = NULL;
- break;
- }
- dir = subdir;
- }
-
- return dir;
-}
-
-/*
- * Find the value entry with the given name in dir, sorting ref_dirs
- * and recursing into subdirectories as necessary. If the name is not
- * found or it corresponds to a directory entry, return NULL.
- */
-static struct ref_entry *find_ref(struct ref_dir *dir, const char *refname)
-{
- int entry_index;
- struct ref_entry *entry;
- dir = find_containing_dir(dir, refname, 0);
- if (!dir)
- return NULL;
- entry_index = search_ref_dir(dir, refname, strlen(refname));
- if (entry_index == -1)
- return NULL;
- entry = dir->entries[entry_index];
- return (entry->flag & REF_DIR) ? NULL : entry;
-}
-
-/*
- * Remove the entry with the given name from dir, recursing into
- * subdirectories as necessary. If refname is the name of a directory
- * (i.e., ends with '/'), then remove the directory and its contents.
- * If the removal was successful, return the number of entries
- * remaining in the directory entry that contained the deleted entry.
- * If the name was not found, return -1. Please note that this
- * function only deletes the entry from the cache; it does not delete
- * it from the filesystem or ensure that other cache entries (which
- * might be symbolic references to the removed entry) are updated.
- * Nor does it remove any containing dir entries that might be made
- * empty by the removal. dir must represent the top-level directory
- * and must already be complete.
- */
-static int remove_entry(struct ref_dir *dir, const char *refname)
-{
- int refname_len = strlen(refname);
- int entry_index;
- struct ref_entry *entry;
- int is_dir = refname[refname_len - 1] == '/';
- if (is_dir) {
- /*
- * refname represents a reference directory. Remove
- * the trailing slash; otherwise we will get the
- * directory *representing* refname rather than the
- * one *containing* it.
- */
- char *dirname = xmemdupz(refname, refname_len - 1);
- dir = find_containing_dir(dir, dirname, 0);
- free(dirname);
- } else {
- dir = find_containing_dir(dir, refname, 0);
+ if (refs->loose) {
+ free_ref_cache(refs->loose);
+ refs->loose = NULL;
}
- if (!dir)
- return -1;
- entry_index = search_ref_dir(dir, refname, refname_len);
- if (entry_index == -1)
- return -1;
- entry = dir->entries[entry_index];
-
- memmove(&dir->entries[entry_index],
- &dir->entries[entry_index + 1],
- (dir->nr - entry_index - 1) * sizeof(*dir->entries)
- );
- dir->nr--;
- if (dir->sorted > entry_index)
- dir->sorted--;
- free_ref_entry(entry);
- return dir->nr;
-}
-
-/*
- * Add a ref_entry to the ref_dir (unsorted), recursing into
- * subdirectories as necessary. dir must represent the top-level
- * directory. Return 0 on success.
- */
-static int add_ref(struct ref_dir *dir, struct ref_entry *ref)
-{
- dir = find_containing_dir(dir, ref->name, 1);
- if (!dir)
- return -1;
- add_entry_to_dir(dir, ref);
- return 0;
}
/*
- * Emit a warning and return true iff ref1 and ref2 have the same name
- * and the same sha1. Die if they have the same name but different
- * sha1s.
+ * Create a new submodule ref cache and add it to the internal
+ * set of caches.
*/
-static int is_dup_ref(const struct ref_entry *ref1, const struct ref_entry *ref2)
+static struct ref_store *files_ref_store_create(const char *gitdir,
+ unsigned int flags)
{
- if (strcmp(ref1->name, ref2->name))
- return 0;
-
- /* Duplicate name; make sure that they don't conflict: */
+ struct files_ref_store *refs = xcalloc(1, sizeof(*refs));
+ struct ref_store *ref_store = (struct ref_store *)refs;
+ struct strbuf sb = STRBUF_INIT;
- if ((ref1->flag & REF_DIR) || (ref2->flag & REF_DIR))
- /* This is impossible by construction */
- die("Reference directory conflict: %s", ref1->name);
+ base_ref_store_init(ref_store, &refs_be_files);
+ refs->store_flags = flags;
- if (oidcmp(&ref1->u.value.oid, &ref2->u.value.oid))
- die("Duplicated ref, and SHA1s don't match: %s", ref1->name);
+ refs->gitdir = xstrdup(gitdir);
+ get_common_dir_noenv(&sb, gitdir);
+ refs->gitcommondir = strbuf_detach(&sb, NULL);
+ strbuf_addf(&sb, "%s/packed-refs", refs->gitcommondir);
+ refs->packed_ref_store = packed_ref_store_create(sb.buf, flags);
+ strbuf_release(&sb);
- warning("Duplicated ref: %s", ref1->name);
- return 1;
+ return ref_store;
}
/*
- * Sort the entries in dir non-recursively (if they are not already
- * sorted) and remove any duplicate entries.
+ * Die if refs is not the main ref store. caller is used in any
+ * necessary error messages.
*/
-static void sort_ref_dir(struct ref_dir *dir)
+static void files_assert_main_repository(struct files_ref_store *refs,
+ const char *caller)
{
- int i, j;
- struct ref_entry *last = NULL;
-
- /*
- * This check also prevents passing a zero-length array to qsort(),
- * which is a problem on some platforms.
- */
- if (dir->sorted == dir->nr)
+ if (refs->store_flags & REF_STORE_MAIN)
return;
- qsort(dir->entries, dir->nr, sizeof(*dir->entries), ref_entry_cmp);
-
- /* Remove any duplicates: */
- for (i = 0, j = 0; j < dir->nr; j++) {
- struct ref_entry *entry = dir->entries[j];
- if (last && is_dup_ref(last, entry))
- free_ref_entry(entry);
- else
- last = dir->entries[i++] = entry;
- }
- dir->sorted = dir->nr = i;
+ die("BUG: operation %s only allowed for main ref store", caller);
}
-/* Include broken references in a do_for_each_ref*() iteration: */
-#define DO_FOR_EACH_INCLUDE_BROKEN 0x01
-
/*
- * Return true iff the reference described by entry can be resolved to
- * an object in the database. Emit a warning if the referred-to
- * object does not exist.
+ * Downcast ref_store to files_ref_store. Die if ref_store is not a
+ * files_ref_store. required_flags is compared with ref_store's
+ * store_flags to ensure the ref_store has all required capabilities.
+ * "caller" is used in any necessary error messages.
*/
-static int ref_resolves_to_object(struct ref_entry *entry)
+static struct files_ref_store *files_downcast(struct ref_store *ref_store,
+ unsigned int required_flags,
+ const char *caller)
{
- if (entry->flag & REF_ISBROKEN)
- return 0;
- if (!has_sha1_file(entry->u.value.oid.hash)) {
- error("%s does not point to a valid object!", entry->name);
- return 0;
- }
- return 1;
-}
-
-/*
- * current_ref is a performance hack: when iterating over references
- * using the for_each_ref*() functions, current_ref is set to the
- * current reference's entry before calling the callback function. If
- * the callback function calls peel_ref(), then peel_ref() first
- * checks whether the reference to be peeled is the current reference
- * (it usually is) and if so, returns that reference's peeled version
- * if it is available. This avoids a refname lookup in a common case.
- */
-static struct ref_entry *current_ref;
-
-typedef int each_ref_entry_fn(struct ref_entry *entry, void *cb_data);
-
-struct ref_entry_cb {
- const char *base;
- int trim;
- int flags;
- each_ref_fn *fn;
- void *cb_data;
-};
+ struct files_ref_store *refs;
-/*
- * Handle one reference in a do_for_each_ref*()-style iteration,
- * calling an each_ref_fn for each entry.
- */
-static int do_one_ref(struct ref_entry *entry, void *cb_data)
-{
- struct ref_entry_cb *data = cb_data;
- struct ref_entry *old_current_ref;
- int retval;
-
- if (!starts_with(entry->name, data->base))
- return 0;
-
- if (!(data->flags & DO_FOR_EACH_INCLUDE_BROKEN) &&
- !ref_resolves_to_object(entry))
- return 0;
+ if (ref_store->be != &refs_be_files)
+ die("BUG: ref_store is type \"%s\" not \"files\" in %s",
+ ref_store->be->name, caller);
- /* Store the old value, in case this is a recursive call: */
- old_current_ref = current_ref;
- current_ref = entry;
- retval = data->fn(entry->name + data->trim, &entry->u.value.oid,
- entry->flag, data->cb_data);
- current_ref = old_current_ref;
- return retval;
-}
+ refs = (struct files_ref_store *)ref_store;
-/*
- * Call fn for each reference in dir that has index in the range
- * offset <= index < dir->nr. Recurse into subdirectories that are in
- * that index range, sorting them before iterating. This function
- * does not sort dir itself; it should be sorted beforehand. fn is
- * called for all references, including broken ones.
- */
-static int do_for_each_entry_in_dir(struct ref_dir *dir, int offset,
- each_ref_entry_fn fn, void *cb_data)
-{
- int i;
- assert(dir->sorted == dir->nr);
- for (i = offset; i < dir->nr; i++) {
- struct ref_entry *entry = dir->entries[i];
- int retval;
- if (entry->flag & REF_DIR) {
- struct ref_dir *subdir = get_ref_dir(entry);
- sort_ref_dir(subdir);
- retval = do_for_each_entry_in_dir(subdir, 0, fn, cb_data);
- } else {
- retval = fn(entry, cb_data);
- }
- if (retval)
- return retval;
- }
- return 0;
-}
+ if ((refs->store_flags & required_flags) != required_flags)
+ die("BUG: operation %s requires abilities 0x%x, but only have 0x%x",
+ caller, required_flags, refs->store_flags);
-/*
- * Call fn for each reference in the union of dir1 and dir2, in order
- * by refname. Recurse into subdirectories. If a value entry appears
- * in both dir1 and dir2, then only process the version that is in
- * dir2. The input dirs must already be sorted, but subdirs will be
- * sorted as needed. fn is called for all references, including
- * broken ones.
- */
-static int do_for_each_entry_in_dirs(struct ref_dir *dir1,
- struct ref_dir *dir2,
- each_ref_entry_fn fn, void *cb_data)
-{
- int retval;
- int i1 = 0, i2 = 0;
-
- assert(dir1->sorted == dir1->nr);
- assert(dir2->sorted == dir2->nr);
- while (1) {
- struct ref_entry *e1, *e2;
- int cmp;
- if (i1 == dir1->nr) {
- return do_for_each_entry_in_dir(dir2, i2, fn, cb_data);
- }
- if (i2 == dir2->nr) {
- return do_for_each_entry_in_dir(dir1, i1, fn, cb_data);
- }
- e1 = dir1->entries[i1];
- e2 = dir2->entries[i2];
- cmp = strcmp(e1->name, e2->name);
- if (cmp == 0) {
- if ((e1->flag & REF_DIR) && (e2->flag & REF_DIR)) {
- /* Both are directories; descend them in parallel. */
- struct ref_dir *subdir1 = get_ref_dir(e1);
- struct ref_dir *subdir2 = get_ref_dir(e2);
- sort_ref_dir(subdir1);
- sort_ref_dir(subdir2);
- retval = do_for_each_entry_in_dirs(
- subdir1, subdir2, fn, cb_data);
- i1++;
- i2++;
- } else if (!(e1->flag & REF_DIR) && !(e2->flag & REF_DIR)) {
- /* Both are references; ignore the one from dir1. */
- retval = fn(e2, cb_data);
- i1++;
- i2++;
- } else {
- die("conflict between reference and directory: %s",
- e1->name);
- }
- } else {
- struct ref_entry *e;
- if (cmp < 0) {
- e = e1;
- i1++;
- } else {
- e = e2;
- i2++;
- }
- if (e->flag & REF_DIR) {
- struct ref_dir *subdir = get_ref_dir(e);
- sort_ref_dir(subdir);
- retval = do_for_each_entry_in_dir(
- subdir, 0, fn, cb_data);
- } else {
- retval = fn(e, cb_data);
- }
- }
- if (retval)
- return retval;
- }
-}
-
-/*
- * Load all of the refs from the dir into our in-memory cache. The hard work
- * of loading loose refs is done by get_ref_dir(), so we just need to recurse
- * through all of the sub-directories. We do not even need to care about
- * sorting, as traversal order does not matter to us.
- */
-static void prime_ref_dir(struct ref_dir *dir)
-{
- int i;
- for (i = 0; i < dir->nr; i++) {
- struct ref_entry *entry = dir->entries[i];
- if (entry->flag & REF_DIR)
- prime_ref_dir(get_ref_dir(entry));
- }
+ return refs;
}
-struct nonmatching_ref_data {
- const struct string_list *skip;
- const char *conflicting_refname;
-};
-
-static int nonmatching_ref_fn(struct ref_entry *entry, void *vdata)
+static void files_reflog_path(struct files_ref_store *refs,
+ struct strbuf *sb,
+ const char *refname)
{
- struct nonmatching_ref_data *data = vdata;
-
- if (data->skip && string_list_has_string(data->skip, entry->name))
- return 0;
-
- data->conflicting_refname = entry->name;
- return 1;
-}
-
-/*
- * Return 0 if a reference named refname could be created without
- * conflicting with the name of an existing reference in dir.
- * See verify_refname_available for more information.
- */
-static int verify_refname_available_dir(const char *refname,
- const struct string_list *extras,
- const struct string_list *skip,
- struct ref_dir *dir,
- struct strbuf *err)
-{
- const char *slash;
- const char *extra_refname;
- int pos;
- struct strbuf dirname = STRBUF_INIT;
- int ret = -1;
-
- /*
- * For the sake of comments in this function, suppose that
- * refname is "refs/foo/bar".
- */
-
- assert(err);
-
- strbuf_grow(&dirname, strlen(refname) + 1);
- for (slash = strchr(refname, '/'); slash; slash = strchr(slash + 1, '/')) {
- /* Expand dirname to the new prefix, not including the trailing slash: */
- strbuf_add(&dirname, refname + dirname.len, slash - refname - dirname.len);
-
- /*
- * We are still at a leading dir of the refname (e.g.,
- * "refs/foo"; if there is a reference with that name,
- * it is a conflict, *unless* it is in skip.
- */
- if (dir) {
- pos = search_ref_dir(dir, dirname.buf, dirname.len);
- if (pos >= 0 &&
- (!skip || !string_list_has_string(skip, dirname.buf))) {
- /*
- * We found a reference whose name is
- * a proper prefix of refname; e.g.,
- * "refs/foo", and is not in skip.
- */
- strbuf_addf(err, "'%s' exists; cannot create '%s'",
- dirname.buf, refname);
- goto cleanup;
- }
- }
-
- if (extras && string_list_has_string(extras, dirname.buf) &&
- (!skip || !string_list_has_string(skip, dirname.buf))) {
- strbuf_addf(err, "cannot process '%s' and '%s' at the same time",
- refname, dirname.buf);
- goto cleanup;
- }
-
+ if (!refname) {
/*
- * Otherwise, we can try to continue our search with
- * the next component. So try to look up the
- * directory, e.g., "refs/foo/". If we come up empty,
- * we know there is nothing under this whole prefix,
- * but even in that case we still have to continue the
- * search for conflicts with extras.
+ * FIXME: of course this is wrong in multi worktree
+ * setting. To be fixed real soon.
*/
- strbuf_addch(&dirname, '/');
- if (dir) {
- pos = search_ref_dir(dir, dirname.buf, dirname.len);
- if (pos < 0) {
- /*
- * There was no directory "refs/foo/",
- * so there is nothing under this
- * whole prefix. So there is no need
- * to continue looking for conflicting
- * references. But we need to continue
- * looking for conflicting extras.
- */
- dir = NULL;
- } else {
- dir = get_ref_dir(dir->entries[pos]);
- }
- }
- }
-
- /*
- * We are at the leaf of our refname (e.g., "refs/foo/bar").
- * There is no point in searching for a reference with that
- * name, because a refname isn't considered to conflict with
- * itself. But we still need to check for references whose
- * names are in the "refs/foo/bar/" namespace, because they
- * *do* conflict.
- */
- strbuf_addstr(&dirname, refname + dirname.len);
- strbuf_addch(&dirname, '/');
-
- if (dir) {
- pos = search_ref_dir(dir, dirname.buf, dirname.len);
-
- if (pos >= 0) {
- /*
- * We found a directory named "$refname/"
- * (e.g., "refs/foo/bar/"). It is a problem
- * iff it contains any ref that is not in
- * "skip".
- */
- struct nonmatching_ref_data data;
-
- data.skip = skip;
- data.conflicting_refname = NULL;
- dir = get_ref_dir(dir->entries[pos]);
- sort_ref_dir(dir);
- if (do_for_each_entry_in_dir(dir, 0, nonmatching_ref_fn, &data)) {
- strbuf_addf(err, "'%s' exists; cannot create '%s'",
- data.conflicting_refname, refname);
- goto cleanup;
- }
- }
- }
-
- extra_refname = find_descendant_ref(dirname.buf, extras, skip);
- if (extra_refname)
- strbuf_addf(err, "cannot process '%s' and '%s' at the same time",
- refname, extra_refname);
- else
- ret = 0;
-
-cleanup:
- strbuf_release(&dirname);
- return ret;
-}
-
-struct packed_ref_cache {
- struct ref_entry *root;
-
- /*
- * Count of references to the data structure in this instance,
- * including the pointer from ref_cache::packed if any. The
- * data will not be freed as long as the reference count is
- * nonzero.
- */
- unsigned int referrers;
-
- /*
- * Iff the packed-refs file associated with this instance is
- * currently locked for writing, this points at the associated
- * lock (which is owned by somebody else). The referrer count
- * is also incremented when the file is locked and decremented
- * when it is unlocked.
- */
- struct lock_file *lock;
-
- /* The metadata from when this packed-refs cache was read */
- struct stat_validity validity;
-};
-
-/*
- * Future: need to be in "struct repository"
- * when doing a full libification.
- */
-static struct ref_cache {
- struct ref_cache *next;
- struct ref_entry *loose;
- struct packed_ref_cache *packed;
- /*
- * The submodule name, or "" for the main repo. We allocate
- * length 1 rather than FLEX_ARRAY so that the main ref_cache
- * is initialized correctly.
- */
- char name[1];
-} ref_cache, *submodule_ref_caches;
-
-/* Lock used for the main packed-refs file: */
-static struct lock_file packlock;
-
-/*
- * Increment the reference count of *packed_refs.
- */
-static void acquire_packed_ref_cache(struct packed_ref_cache *packed_refs)
-{
- packed_refs->referrers++;
-}
-
-/*
- * Decrease the reference count of *packed_refs. If it goes to zero,
- * free *packed_refs and return true; otherwise return false.
- */
-static int release_packed_ref_cache(struct packed_ref_cache *packed_refs)
-{
- if (!--packed_refs->referrers) {
- free_ref_entry(packed_refs->root);
- stat_validity_clear(&packed_refs->validity);
- free(packed_refs);
- return 1;
- } else {
- return 0;
- }
-}
-
-static void clear_packed_ref_cache(struct ref_cache *refs)
-{
- if (refs->packed) {
- struct packed_ref_cache *packed_refs = refs->packed;
-
- if (packed_refs->lock)
- die("internal error: packed-ref cache cleared while locked");
- refs->packed = NULL;
- release_packed_ref_cache(packed_refs);
- }
-}
-
-static void clear_loose_ref_cache(struct ref_cache *refs)
-{
- if (refs->loose) {
- free_ref_entry(refs->loose);
- refs->loose = NULL;
+ strbuf_addf(sb, "%s/logs", refs->gitcommondir);
+ return;
}
-}
-
-/*
- * Create a new submodule ref cache and add it to the internal
- * set of caches.
- */
-static struct ref_cache *create_ref_cache(const char *submodule)
-{
- struct ref_cache *refs;
- if (!submodule)
- submodule = "";
- FLEX_ALLOC_STR(refs, name, submodule);
- refs->next = submodule_ref_caches;
- submodule_ref_caches = refs;
- return refs;
-}
-
-static struct ref_cache *lookup_ref_cache(const char *submodule)
-{
- struct ref_cache *refs;
-
- if (!submodule || !*submodule)
- return &ref_cache;
- for (refs = submodule_ref_caches; refs; refs = refs->next)
- if (!strcmp(submodule, refs->name))
- return refs;
- return NULL;
-}
-
-/*
- * Return a pointer to a ref_cache for the specified submodule. For
- * the main repository, use submodule==NULL. The returned structure
- * will be allocated and initialized but not necessarily populated; it
- * should not be freed.
- */
-static struct ref_cache *get_ref_cache(const char *submodule)
-{
- struct ref_cache *refs = lookup_ref_cache(submodule);
- if (!refs)
- refs = create_ref_cache(submodule);
- return refs;
-}
-
-/* The length of a peeled reference line in packed-refs, including EOL: */
-#define PEELED_LINE_LENGTH 42
-
-/*
- * The packed-refs header line that we write out. Perhaps other
- * traits will be added later. The trailing space is required.
- */
-static const char PACKED_REFS_HEADER[] =
- "# pack-refs with: peeled fully-peeled \n";
-
-/*
- * Parse one line from a packed-refs file. Write the SHA1 to sha1.
- * Return a pointer to the refname within the line (null-terminated),
- * or NULL if there was a problem.
- */
-static const char *parse_ref_line(struct strbuf *line, unsigned char *sha1)
-{
- const char *ref;
-
- /*
- * 42: the answer to everything.
- *
- * In this case, it happens to be the answer to
- * 40 (length of sha1 hex representation)
- * +1 (space in between hex and name)
- * +1 (newline at the end of the line)
- */
- if (line->len <= 42)
- return NULL;
-
- if (get_sha1_hex(line->buf, sha1) < 0)
- return NULL;
- if (!isspace(line->buf[40]))
- return NULL;
-
- ref = line->buf + 41;
- if (isspace(*ref))
- return NULL;
-
- if (line->buf[line->len - 1] != '\n')
- return NULL;
- line->buf[--line->len] = 0;
-
- return ref;
-}
-
-/*
- * Read f, which is a packed-refs file, into dir.
- *
- * A comment line of the form "# pack-refs with: " may contain zero or
- * more traits. We interpret the traits as follows:
- *
- * No traits:
- *
- * Probably no references are peeled. But if the file contains a
- * peeled value for a reference, we will use it.
- *
- * peeled:
- *
- * References under "refs/tags/", if they *can* be peeled, *are*
- * peeled in this file. References outside of "refs/tags/" are
- * probably not peeled even if they could have been, but if we find
- * a peeled value for such a reference we will use it.
- *
- * fully-peeled:
- *
- * All references in the file that can be peeled are peeled.
- * Inversely (and this is more important), any references in the
- * file for which no peeled value is recorded is not peelable. This
- * trait should typically be written alongside "peeled" for
- * compatibility with older clients, but we do not require it
- * (i.e., "peeled" is a no-op if "fully-peeled" is set).
- */
-static void read_packed_refs(FILE *f, struct ref_dir *dir)
-{
- struct ref_entry *last = NULL;
- struct strbuf line = STRBUF_INIT;
- enum { PEELED_NONE, PEELED_TAGS, PEELED_FULLY } peeled = PEELED_NONE;
-
- while (strbuf_getwholeline(&line, f, '\n') != EOF) {
- unsigned char sha1[20];
- const char *refname;
- const char *traits;
-
- if (skip_prefix(line.buf, "# pack-refs with:", &traits)) {
- if (strstr(traits, " fully-peeled "))
- peeled = PEELED_FULLY;
- else if (strstr(traits, " peeled "))
- peeled = PEELED_TAGS;
- /* perhaps other traits later as well */
- continue;
- }
-
- refname = parse_ref_line(&line, sha1);
- if (refname) {
- int flag = REF_ISPACKED;
-
- if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
- if (!refname_is_safe(refname))
- die("packed refname is dangerous: %s", refname);
- hashclr(sha1);
- flag |= REF_BAD_NAME | REF_ISBROKEN;
- }
- last = create_ref_entry(refname, sha1, flag, 0);
- if (peeled == PEELED_FULLY ||
- (peeled == PEELED_TAGS && starts_with(refname, "refs/tags/")))
- last->flag |= REF_KNOWS_PEELED;
- add_ref(dir, last);
- continue;
- }
- if (last &&
- line.buf[0] == '^' &&
- line.len == PEELED_LINE_LENGTH &&
- line.buf[PEELED_LINE_LENGTH - 1] == '\n' &&
- !get_sha1_hex(line.buf + 1, sha1)) {
- hashcpy(last->u.value.peeled.hash, sha1);
- /*
- * Regardless of what the file header said,
- * we definitely know the value of *this*
- * reference:
- */
- last->flag |= REF_KNOWS_PEELED;
- }
+ switch (ref_type(refname)) {
+ case REF_TYPE_PER_WORKTREE:
+ case REF_TYPE_PSEUDOREF:
+ strbuf_addf(sb, "%s/logs/%s", refs->gitdir, refname);
+ break;
+ case REF_TYPE_NORMAL:
+ strbuf_addf(sb, "%s/logs/%s", refs->gitcommondir, refname);
+ break;
+ default:
+ die("BUG: unknown ref type %d of ref %s",
+ ref_type(refname), refname);
}
-
- strbuf_release(&line);
}
-/*
- * Get the packed_ref_cache for the specified ref_cache, creating it
- * if necessary.
- */
-static struct packed_ref_cache *get_packed_ref_cache(struct ref_cache *refs)
+static void files_ref_path(struct files_ref_store *refs,
+ struct strbuf *sb,
+ const char *refname)
{
- char *packed_refs_file;
-
- if (*refs->name)
- packed_refs_file = git_pathdup_submodule(refs->name, "packed-refs");
- else
- packed_refs_file = git_pathdup("packed-refs");
-
- if (refs->packed &&
- !stat_validity_check(&refs->packed->validity, packed_refs_file))
- clear_packed_ref_cache(refs);
-
- if (!refs->packed) {
- FILE *f;
-
- refs->packed = xcalloc(1, sizeof(*refs->packed));
- acquire_packed_ref_cache(refs->packed);
- refs->packed->root = create_dir_entry(refs, "", 0, 0);
- f = fopen(packed_refs_file, "r");
- if (f) {
- stat_validity_update(&refs->packed->validity, fileno(f));
- read_packed_refs(f, get_ref_dir(refs->packed->root));
- fclose(f);
- }
+ switch (ref_type(refname)) {
+ case REF_TYPE_PER_WORKTREE:
+ case REF_TYPE_PSEUDOREF:
+ strbuf_addf(sb, "%s/%s", refs->gitdir, refname);
+ break;
+ case REF_TYPE_NORMAL:
+ strbuf_addf(sb, "%s/%s", refs->gitcommondir, refname);
+ break;
+ default:
+ die("BUG: unknown ref type %d of ref %s",
+ ref_type(refname), refname);
}
- free(packed_refs_file);
- return refs->packed;
-}
-
-static struct ref_dir *get_packed_ref_dir(struct packed_ref_cache *packed_ref_cache)
-{
- return get_ref_dir(packed_ref_cache->root);
-}
-
-static struct ref_dir *get_packed_refs(struct ref_cache *refs)
-{
- return get_packed_ref_dir(get_packed_ref_cache(refs));
-}
-
-/*
- * Add a reference to the in-memory packed reference cache. This may
- * only be called while the packed-refs file is locked (see
- * lock_packed_refs()). To actually write the packed-refs file, call
- * commit_packed_refs().
- */
-static void add_packed_ref(const char *refname, const unsigned char *sha1)
-{
- struct packed_ref_cache *packed_ref_cache =
- get_packed_ref_cache(&ref_cache);
-
- if (!packed_ref_cache->lock)
- die("internal error: packed refs not locked");
- add_ref(get_packed_ref_dir(packed_ref_cache),
- create_ref_entry(refname, sha1, REF_ISPACKED, 1));
}
/*
* (without recursing). dirname must end with '/'. dir must be the
* directory entry corresponding to dirname.
*/
-static void read_loose_refs(const char *dirname, struct ref_dir *dir)
+static void loose_fill_ref_dir(struct ref_store *ref_store,
+ struct ref_dir *dir, const char *dirname)
{
- struct ref_cache *refs = dir->ref_cache;
+ struct files_ref_store *refs =
+ files_downcast(ref_store, REF_STORE_READ, "fill_ref_dir");
DIR *d;
struct dirent *de;
int dirnamelen = strlen(dirname);
struct strbuf path = STRBUF_INIT;
size_t path_baselen;
- if (*refs->name)
- strbuf_git_path_submodule(&path, refs->name, "%s", dirname);
- else
- strbuf_git_path(&path, "%s", dirname);
+ files_ref_path(refs, &path, dirname);
path_baselen = path.len;
d = opendir(path.buf);
strbuf_add(&refname, dirname, dirnamelen);
while ((de = readdir(d)) != NULL) {
- unsigned char sha1[20];
+ struct object_id oid;
struct stat st;
int flag;
} else if (S_ISDIR(st.st_mode)) {
strbuf_addch(&refname, '/');
add_entry_to_dir(dir,
- create_dir_entry(refs, refname.buf,
+ create_dir_entry(dir->cache, refname.buf,
refname.len, 1));
} else {
- int read_ok;
-
- if (*refs->name) {
- hashclr(sha1);
- flag = 0;
- read_ok = !resolve_gitlink_ref(refs->name,
- refname.buf, sha1);
- } else {
- read_ok = !read_ref_full(refname.buf,
- RESOLVE_REF_READING,
- sha1, &flag);
- }
-
- if (!read_ok) {
- hashclr(sha1);
+ if (!refs_resolve_ref_unsafe(&refs->base,
+ refname.buf,
+ RESOLVE_REF_READING,
+ oid.hash, &flag)) {
+ oidclr(&oid);
flag |= REF_ISBROKEN;
- } else if (is_null_sha1(sha1)) {
+ } else if (is_null_oid(&oid)) {
/*
* It is so astronomically unlikely
* that NULL_SHA1 is the SHA-1 of an
REFNAME_ALLOW_ONELEVEL)) {
if (!refname_is_safe(refname.buf))
die("loose refname is dangerous: %s", refname.buf);
- hashclr(sha1);
+ oidclr(&oid);
flag |= REF_BAD_NAME | REF_ISBROKEN;
}
add_entry_to_dir(dir,
- create_ref_entry(refname.buf, sha1, flag, 0));
+ create_ref_entry(refname.buf, &oid, flag));
}
strbuf_setlen(&refname, dirnamelen);
strbuf_setlen(&path, path_baselen);
strbuf_release(&refname);
strbuf_release(&path);
closedir(d);
+
+ /*
+ * Manually add refs/bisect, which, being per-worktree, might
+ * not appear in the directory listing for refs/ in the main
+ * repo.
+ */
+ if (!strcmp(dirname, "refs/")) {
+ int pos = search_ref_dir(dir, "refs/bisect/", 12);
+
+ if (pos < 0) {
+ struct ref_entry *child_entry = create_dir_entry(
+ dir->cache, "refs/bisect/", 12, 1);
+ add_entry_to_dir(dir, child_entry);
+ }
+ }
}
-static struct ref_dir *get_loose_refs(struct ref_cache *refs)
+static struct ref_cache *get_loose_ref_cache(struct files_ref_store *refs)
{
if (!refs->loose) {
/*
* are about to read the only subdirectory that can
* hold references:
*/
- refs->loose = create_dir_entry(refs, "", 0, 0);
+ refs->loose = create_ref_cache(&refs->base, loose_fill_ref_dir);
+
+ /* We're going to fill the top level ourselves: */
+ refs->loose->root->flag &= ~REF_INCOMPLETE;
+
/*
- * Create an incomplete entry for "refs/":
+ * Add an incomplete entry for "refs/" (to be filled
+ * lazily):
*/
- add_entry_to_dir(get_ref_dir(refs->loose),
- create_dir_entry(refs, "refs/", 5, 1));
+ add_entry_to_dir(get_ref_dir(refs->loose->root),
+ create_dir_entry(refs->loose, "refs/", 5, 1));
}
- return get_ref_dir(refs->loose);
+ return refs->loose;
}
-/* We allow "recursive" symbolic refs. Only within reason, though */
-#define MAXDEPTH 5
-#define MAXREFLEN (1024)
-
-/*
- * Called by resolve_gitlink_ref_recursive() after it failed to read
- * from the loose refs in ref_cache refs. Find <refname> in the
- * packed-refs file for the submodule.
- */
-static int resolve_gitlink_packed_ref(struct ref_cache *refs,
- const char *refname, unsigned char *sha1)
+static int files_read_raw_ref(struct ref_store *ref_store,
+ const char *refname, unsigned char *sha1,
+ struct strbuf *referent, unsigned int *type)
{
- struct ref_entry *ref;
- struct ref_dir *dir = get_packed_refs(refs);
+ struct files_ref_store *refs =
+ files_downcast(ref_store, REF_STORE_READ, "read_raw_ref");
+ struct strbuf sb_contents = STRBUF_INIT;
+ struct strbuf sb_path = STRBUF_INIT;
+ const char *path;
+ const char *buf;
+ struct stat st;
+ int fd;
+ int ret = -1;
+ int save_errno;
+ int remaining_retries = 3;
- ref = find_ref(dir, refname);
- if (ref == NULL)
- return -1;
+ *type = 0;
+ strbuf_reset(&sb_path);
- hashcpy(sha1, ref->u.value.oid.hash);
- return 0;
-}
+ files_ref_path(refs, &sb_path, refname);
-static int resolve_gitlink_ref_recursive(struct ref_cache *refs,
- const char *refname, unsigned char *sha1,
- int recursion)
-{
- int fd, len;
- char buffer[128], *p;
- char *path;
+ path = sb_path.buf;
- if (recursion > MAXDEPTH || strlen(refname) > MAXREFLEN)
- return -1;
- path = *refs->name
- ? git_pathdup_submodule(refs->name, "%s", refname)
- : git_pathdup("%s", refname);
- fd = open(path, O_RDONLY);
- free(path);
- if (fd < 0)
- return resolve_gitlink_packed_ref(refs, refname, sha1);
+stat_ref:
+ /*
+ * We might have to loop back here to avoid a race
+ * condition: first we lstat() the file, then we try
+ * to read it as a link or as a file. But if somebody
+ * changes the type of the file (file <-> directory
+ * <-> symlink) between the lstat() and reading, then
+ * we don't want to report that as an error but rather
+ * try again starting with the lstat().
+ *
+ * We'll keep a count of the retries, though, just to avoid
+ * any confusing situation sending us into an infinite loop.
+ */
- len = read(fd, buffer, sizeof(buffer)-1);
- close(fd);
- if (len < 0)
- return -1;
- while (len && isspace(buffer[len-1]))
- len--;
- buffer[len] = 0;
+ if (remaining_retries-- <= 0)
+ goto out;
- /* Was it a detached head or an old-fashioned symlink? */
- if (!get_sha1_hex(buffer, sha1))
- return 0;
+ if (lstat(path, &st) < 0) {
+ if (errno != ENOENT)
+ goto out;
+ if (refs_read_raw_ref(refs->packed_ref_store, refname,
+ sha1, referent, type)) {
+ errno = ENOENT;
+ goto out;
+ }
+ ret = 0;
+ goto out;
+ }
- /* Symref? */
- if (strncmp(buffer, "ref:", 4))
- return -1;
- p = buffer + 4;
- while (isspace(*p))
- p++;
+ /* Follow "normalized" - ie "refs/.." symlinks by hand */
+ if (S_ISLNK(st.st_mode)) {
+ strbuf_reset(&sb_contents);
+ if (strbuf_readlink(&sb_contents, path, 0) < 0) {
+ if (errno == ENOENT || errno == EINVAL)
+ /* inconsistent with lstat; retry */
+ goto stat_ref;
+ else
+ goto out;
+ }
+ if (starts_with(sb_contents.buf, "refs/") &&
+ !check_refname_format(sb_contents.buf, 0)) {
+ strbuf_swap(&sb_contents, referent);
+ *type |= REF_ISSYMREF;
+ ret = 0;
+ goto out;
+ }
+ /*
+ * It doesn't look like a refname; fall through to just
+ * treating it like a non-symlink, and reading whatever it
+ * points to.
+ */
+ }
- return resolve_gitlink_ref_recursive(refs, p, sha1, recursion+1);
-}
+ /* Is it a directory? */
+ if (S_ISDIR(st.st_mode)) {
+ /*
+ * Even though there is a directory where the loose
+ * ref is supposed to be, there could still be a
+ * packed ref:
+ */
+ if (refs_read_raw_ref(refs->packed_ref_store, refname,
+ sha1, referent, type)) {
+ errno = EISDIR;
+ goto out;
+ }
+ ret = 0;
+ goto out;
+ }
-int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *sha1)
-{
- int len = strlen(path), retval;
- struct strbuf submodule = STRBUF_INIT;
- struct ref_cache *refs;
+ /*
+ * Anything else, just open it and try to use it as
+ * a ref
+ */
+ fd = open(path, O_RDONLY);
+ if (fd < 0) {
+ if (errno == ENOENT && !S_ISLNK(st.st_mode))
+ /* inconsistent with lstat; retry */
+ goto stat_ref;
+ else
+ goto out;
+ }
+ strbuf_reset(&sb_contents);
+ if (strbuf_read(&sb_contents, fd, 256) < 0) {
+ int save_errno = errno;
+ close(fd);
+ errno = save_errno;
+ goto out;
+ }
+ close(fd);
+ strbuf_rtrim(&sb_contents);
+ buf = sb_contents.buf;
+ if (starts_with(buf, "ref:")) {
+ buf += 4;
+ while (isspace(*buf))
+ buf++;
- while (len && path[len-1] == '/')
- len--;
- if (!len)
- return -1;
+ strbuf_reset(referent);
+ strbuf_addstr(referent, buf);
+ *type |= REF_ISSYMREF;
+ ret = 0;
+ goto out;
+ }
- strbuf_add(&submodule, path, len);
- refs = lookup_ref_cache(submodule.buf);
- if (!refs) {
- if (!is_nonbare_repository_dir(&submodule)) {
- strbuf_release(&submodule);
- return -1;
- }
- refs = create_ref_cache(submodule.buf);
+ /*
+ * Please note that FETCH_HEAD has additional
+ * data after the sha.
+ */
+ if (get_sha1_hex(buf, sha1) ||
+ (buf[40] != '\0' && !isspace(buf[40]))) {
+ *type |= REF_ISBROKEN;
+ errno = EINVAL;
+ goto out;
}
- strbuf_release(&submodule);
- retval = resolve_gitlink_ref_recursive(refs, refname, sha1, 0);
- return retval;
+ ret = 0;
+
+out:
+ save_errno = errno;
+ strbuf_release(&sb_path);
+ strbuf_release(&sb_contents);
+ errno = save_errno;
+ return ret;
}
-/*
- * Return the ref_entry for the given refname from the packed
- * references. If it does not exist, return NULL.
- */
-static struct ref_entry *get_packed_ref(const char *refname)
+static void unlock_ref(struct ref_lock *lock)
{
- return find_ref(get_packed_refs(&ref_cache), refname);
+ /* Do not free lock->lk -- atexit() still looks at them */
+ if (lock->lk)
+ rollback_lock_file(lock->lk);
+ free(lock->ref_name);
+ free(lock);
}
/*
- * A loose ref file doesn't exist; check for a packed ref. The
- * options are forwarded from resolve_safe_unsafe().
+ * Lock refname, without following symrefs, and set *lock_p to point
+ * at a newly-allocated lock object. Fill in lock->old_oid, referent,
+ * and type similarly to read_raw_ref().
+ *
+ * The caller must verify that refname is a "safe" reference name (in
+ * the sense of refname_is_safe()) before calling this function.
+ *
+ * If the reference doesn't already exist, verify that refname doesn't
+ * have a D/F conflict with any existing references. extras and skip
+ * are passed to refs_verify_refname_available() for this check.
+ *
+ * If mustexist is not set and the reference is not found or is
+ * broken, lock the reference anyway but clear sha1.
+ *
+ * Return 0 on success. On failure, write an error message to err and
+ * return TRANSACTION_NAME_CONFLICT or TRANSACTION_GENERIC_ERROR.
+ *
+ * Implementation note: This function is basically
+ *
+ * lock reference
+ * read_raw_ref()
+ *
+ * but it includes a lot more code to
+ * - Deal with possible races with other processes
+ * - Avoid calling refs_verify_refname_available() when it can be
+ * avoided, namely if we were successfully able to read the ref
+ * - Generate informative error messages in the case of failure
*/
-static int resolve_missing_loose_ref(const char *refname,
- int resolve_flags,
- unsigned char *sha1,
- int *flags)
-{
- struct ref_entry *entry;
-
- /*
- * The loose reference file does not exist; check for a packed
- * reference.
- */
- entry = get_packed_ref(refname);
- if (entry) {
- hashcpy(sha1, entry->u.value.oid.hash);
- if (flags)
- *flags |= REF_ISPACKED;
- return 0;
- }
- /* The reference is not a packed reference, either. */
- if (resolve_flags & RESOLVE_REF_READING) {
- errno = ENOENT;
- return -1;
- } else {
- hashclr(sha1);
- return 0;
- }
-}
-
-/* This function needs to return a meaningful errno on failure */
-static const char *resolve_ref_1(const char *refname,
- int resolve_flags,
- unsigned char *sha1,
- int *flags,
- struct strbuf *sb_refname,
- struct strbuf *sb_path,
- struct strbuf *sb_contents)
+static int lock_raw_ref(struct files_ref_store *refs,
+ const char *refname, int mustexist,
+ const struct string_list *extras,
+ const struct string_list *skip,
+ struct ref_lock **lock_p,
+ struct strbuf *referent,
+ unsigned int *type,
+ struct strbuf *err)
{
- int depth = MAXDEPTH;
- int bad_name = 0;
+ struct ref_lock *lock;
+ struct strbuf ref_file = STRBUF_INIT;
+ int attempts_remaining = 3;
+ int ret = TRANSACTION_GENERIC_ERROR;
- if (flags)
- *flags = 0;
+ assert(err);
+ files_assert_main_repository(refs, "lock_raw_ref");
- if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
- if (flags)
- *flags |= REF_BAD_NAME;
+ *type = 0;
- if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) ||
- !refname_is_safe(refname)) {
- errno = EINVAL;
- return NULL;
- }
- /*
- * dwim_ref() uses REF_ISBROKEN to distinguish between
- * missing refs and refs that were present but invalid,
- * to complain about the latter to stderr.
- *
- * We don't know whether the ref exists, so don't set
- * REF_ISBROKEN yet.
- */
- bad_name = 1;
- }
- for (;;) {
- const char *path;
- struct stat st;
- char *buf;
- int fd;
+ /* First lock the file so it can't change out from under us. */
- if (--depth < 0) {
- errno = ELOOP;
- return NULL;
- }
+ *lock_p = lock = xcalloc(1, sizeof(*lock));
- strbuf_reset(sb_path);
- strbuf_git_path(sb_path, "%s", refname);
- path = sb_path->buf;
+ lock->ref_name = xstrdup(refname);
+ files_ref_path(refs, &ref_file, refname);
+retry:
+ switch (safe_create_leading_directories(ref_file.buf)) {
+ case SCLD_OK:
+ break; /* success */
+ case SCLD_EXISTS:
/*
- * We might have to loop back here to avoid a race
- * condition: first we lstat() the file, then we try
- * to read it as a link or as a file. But if somebody
- * changes the type of the file (file <-> directory
- * <-> symlink) between the lstat() and reading, then
- * we don't want to report that as an error but rather
- * try again starting with the lstat().
+ * Suppose refname is "refs/foo/bar". We just failed
+ * to create the containing directory, "refs/foo",
+ * because there was a non-directory in the way. This
+ * indicates a D/F conflict, probably because of
+ * another reference such as "refs/foo". There is no
+ * reason to expect this error to be transitory.
*/
- stat_ref:
- if (lstat(path, &st) < 0) {
- if (errno != ENOENT)
- return NULL;
- if (resolve_missing_loose_ref(refname, resolve_flags,
- sha1, flags))
- return NULL;
- if (bad_name) {
- hashclr(sha1);
- if (flags)
- *flags |= REF_ISBROKEN;
+ if (refs_verify_refname_available(&refs->base, refname,
+ extras, skip, err)) {
+ if (mustexist) {
+ /*
+ * To the user the relevant error is
+ * that the "mustexist" reference is
+ * missing:
+ */
+ strbuf_reset(err);
+ strbuf_addf(err, "unable to resolve reference '%s'",
+ refname);
+ } else {
+ /*
+ * The error message set by
+ * refs_verify_refname_available() is
+ * OK.
+ */
+ ret = TRANSACTION_NAME_CONFLICT;
}
- return refname;
+ } else {
+ /*
+ * The file that is in the way isn't a loose
+ * reference. Report it as a low-level
+ * failure.
+ */
+ strbuf_addf(err, "unable to create lock file %s.lock; "
+ "non-directory in the way",
+ ref_file.buf);
}
+ goto error_return;
+ case SCLD_VANISHED:
+ /* Maybe another process was tidying up. Try again. */
+ if (--attempts_remaining > 0)
+ goto retry;
+ /* fall through */
+ default:
+ strbuf_addf(err, "unable to create directory for %s",
+ ref_file.buf);
+ goto error_return;
+ }
- /* Follow "normalized" - ie "refs/.." symlinks by hand */
- if (S_ISLNK(st.st_mode)) {
- strbuf_reset(sb_contents);
- if (strbuf_readlink(sb_contents, path, 0) < 0) {
- if (errno == ENOENT || errno == EINVAL)
- /* inconsistent with lstat; retry */
- goto stat_ref;
- else
- return NULL;
- }
- if (starts_with(sb_contents->buf, "refs/") &&
- !check_refname_format(sb_contents->buf, 0)) {
- strbuf_swap(sb_refname, sb_contents);
- refname = sb_refname->buf;
- if (flags)
- *flags |= REF_ISSYMREF;
- if (resolve_flags & RESOLVE_REF_NO_RECURSE) {
- hashclr(sha1);
- return refname;
- }
- continue;
- }
- }
+ if (!lock->lk)
+ lock->lk = xcalloc(1, sizeof(struct lock_file));
- /* Is it a directory? */
- if (S_ISDIR(st.st_mode)) {
- errno = EISDIR;
- return NULL;
+ if (hold_lock_file_for_update(lock->lk, ref_file.buf, LOCK_NO_DEREF) < 0) {
+ if (errno == ENOENT && --attempts_remaining > 0) {
+ /*
+ * Maybe somebody just deleted one of the
+ * directories leading to ref_file. Try
+ * again:
+ */
+ goto retry;
+ } else {
+ unable_to_lock_message(ref_file.buf, errno, err);
+ goto error_return;
}
+ }
- /*
- * Anything else, just open it and try to use it as
- * a ref
- */
- fd = open(path, O_RDONLY);
- if (fd < 0) {
- if (errno == ENOENT)
- /* inconsistent with lstat; retry */
- goto stat_ref;
- else
- return NULL;
- }
- strbuf_reset(sb_contents);
- if (strbuf_read(sb_contents, fd, 256) < 0) {
- int save_errno = errno;
- close(fd);
- errno = save_errno;
- return NULL;
- }
- close(fd);
- strbuf_rtrim(sb_contents);
+ /*
+ * Now we hold the lock and can read the reference without
+ * fear that its value will change.
+ */
- /*
- * Is it a symbolic ref?
- */
- if (!starts_with(sb_contents->buf, "ref:")) {
+ if (files_read_raw_ref(&refs->base, refname,
+ lock->old_oid.hash, referent, type)) {
+ if (errno == ENOENT) {
+ if (mustexist) {
+ /* Garden variety missing reference. */
+ strbuf_addf(err, "unable to resolve reference '%s'",
+ refname);
+ goto error_return;
+ } else {
+ /*
+ * Reference is missing, but that's OK. We
+ * know that there is not a conflict with
+ * another loose reference because
+ * (supposing that we are trying to lock
+ * reference "refs/foo/bar"):
+ *
+ * - We were successfully able to create
+ * the lockfile refs/foo/bar.lock, so we
+ * know there cannot be a loose reference
+ * named "refs/foo".
+ *
+ * - We got ENOENT and not EISDIR, so we
+ * know that there cannot be a loose
+ * reference named "refs/foo/bar/baz".
+ */
+ }
+ } else if (errno == EISDIR) {
/*
- * Please note that FETCH_HEAD has a second
- * line containing other data.
+ * There is a directory in the way. It might have
+ * contained references that have been deleted. If
+ * we don't require that the reference already
+ * exists, try to remove the directory so that it
+ * doesn't cause trouble when we want to rename the
+ * lockfile into place later.
*/
- if (get_sha1_hex(sb_contents->buf, sha1) ||
- (sb_contents->buf[40] != '\0' && !isspace(sb_contents->buf[40]))) {
- if (flags)
- *flags |= REF_ISBROKEN;
- errno = EINVAL;
- return NULL;
- }
- if (bad_name) {
- hashclr(sha1);
- if (flags)
- *flags |= REF_ISBROKEN;
- }
- return refname;
- }
- if (flags)
- *flags |= REF_ISSYMREF;
- buf = sb_contents->buf + 4;
- while (isspace(*buf))
- buf++;
- strbuf_reset(sb_refname);
- strbuf_addstr(sb_refname, buf);
- refname = sb_refname->buf;
- if (resolve_flags & RESOLVE_REF_NO_RECURSE) {
- hashclr(sha1);
- return refname;
- }
- if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) {
- if (flags)
- *flags |= REF_ISBROKEN;
-
- if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) ||
- !refname_is_safe(buf)) {
- errno = EINVAL;
- return NULL;
+ if (mustexist) {
+ /* Garden variety missing reference. */
+ strbuf_addf(err, "unable to resolve reference '%s'",
+ refname);
+ goto error_return;
+ } else if (remove_dir_recursively(&ref_file,
+ REMOVE_DIR_EMPTY_ONLY)) {
+ if (refs_verify_refname_available(
+ &refs->base, refname,
+ extras, skip, err)) {
+ /*
+ * The error message set by
+ * verify_refname_available() is OK.
+ */
+ ret = TRANSACTION_NAME_CONFLICT;
+ goto error_return;
+ } else {
+ /*
+ * We can't delete the directory,
+ * but we also don't know of any
+ * references that it should
+ * contain.
+ */
+ strbuf_addf(err, "there is a non-empty directory '%s' "
+ "blocking reference '%s'",
+ ref_file.buf, refname);
+ goto error_return;
+ }
}
- bad_name = 1;
+ } else if (errno == EINVAL && (*type & REF_ISBROKEN)) {
+ strbuf_addf(err, "unable to resolve reference '%s': "
+ "reference broken", refname);
+ goto error_return;
+ } else {
+ strbuf_addf(err, "unable to resolve reference '%s': %s",
+ refname, strerror(errno));
+ goto error_return;
}
- }
-}
-
-const char *resolve_ref_unsafe(const char *refname, int resolve_flags,
- unsigned char *sha1, int *flags)
-{
- static struct strbuf sb_refname = STRBUF_INIT;
- struct strbuf sb_contents = STRBUF_INIT;
- struct strbuf sb_path = STRBUF_INIT;
- const char *ret;
- ret = resolve_ref_1(refname, resolve_flags, sha1, flags,
- &sb_refname, &sb_path, &sb_contents);
- strbuf_release(&sb_path);
- strbuf_release(&sb_contents);
- return ret;
-}
+ /*
+ * If the ref did not exist and we are creating it,
+ * make sure there is no existing packed ref that
+ * conflicts with refname:
+ */
+ if (refs_verify_refname_available(
+ refs->packed_ref_store, refname,
+ extras, skip, err))
+ goto error_return;
+ }
-/*
- * Peel the entry (if possible) and return its new peel_status. If
- * repeel is true, re-peel the entry even if there is an old peeled
- * value that is already stored in it.
- *
- * It is OK to call this function with a packed reference entry that
- * might be stale and might even refer to an object that has since
- * been garbage-collected. In such a case, if the entry has
- * REF_KNOWS_PEELED then leave the status unchanged and return
- * PEEL_PEELED or PEEL_NON_TAG; otherwise, return PEEL_INVALID.
- */
-static enum peel_status peel_entry(struct ref_entry *entry, int repeel)
-{
- enum peel_status status;
+ ret = 0;
+ goto out;
- if (entry->flag & REF_KNOWS_PEELED) {
- if (repeel) {
- entry->flag &= ~REF_KNOWS_PEELED;
- oidclr(&entry->u.value.peeled);
- } else {
- return is_null_oid(&entry->u.value.peeled) ?
- PEEL_NON_TAG : PEEL_PEELED;
- }
- }
- if (entry->flag & REF_ISBROKEN)
- return PEEL_BROKEN;
- if (entry->flag & REF_ISSYMREF)
- return PEEL_IS_SYMREF;
+error_return:
+ unlock_ref(lock);
+ *lock_p = NULL;
- status = peel_object(entry->u.value.oid.hash, entry->u.value.peeled.hash);
- if (status == PEEL_PEELED || status == PEEL_NON_TAG)
- entry->flag |= REF_KNOWS_PEELED;
- return status;
+out:
+ strbuf_release(&ref_file);
+ return ret;
}
-int peel_ref(const char *refname, unsigned char *sha1)
+static int files_peel_ref(struct ref_store *ref_store,
+ const char *refname, unsigned char *sha1)
{
+ struct files_ref_store *refs =
+ files_downcast(ref_store, REF_STORE_READ | REF_STORE_ODB,
+ "peel_ref");
int flag;
unsigned char base[20];
- if (current_ref && (current_ref->name == refname
- || !strcmp(current_ref->name, refname))) {
- if (peel_entry(current_ref, 0))
+ if (current_ref_iter && current_ref_iter->refname == refname) {
+ struct object_id peeled;
+
+ if (ref_iterator_peel(current_ref_iter, &peeled))
return -1;
- hashcpy(sha1, current_ref->u.value.peeled.hash);
+ hashcpy(sha1, peeled.hash);
return 0;
}
- if (read_ref_full(refname, RESOLVE_REF_READING, base, &flag))
+ if (refs_read_ref_full(ref_store, refname,
+ RESOLVE_REF_READING, base, &flag))
return -1;
/*
* be expensive and (b) loose references anyway usually do not
* have REF_KNOWS_PEELED.
*/
- if (flag & REF_ISPACKED) {
- struct ref_entry *r = get_packed_ref(refname);
- if (r) {
- if (peel_entry(r, 0))
- return -1;
- hashcpy(sha1, r->u.value.peeled.hash);
- return 0;
- }
- }
+ if (flag & REF_ISPACKED &&
+ !refs_peel_ref(refs->packed_ref_store, refname, sha1))
+ return 0;
return peel_object(base, sha1);
}
-/*
- * Call fn for each reference in the specified ref_cache, omitting
- * references not in the containing_dir of base. fn is called for all
- * references, including broken ones. If fn ever returns a non-zero
- * value, stop the iteration and return that value; otherwise, return
- * 0.
- */
-static int do_for_each_entry(struct ref_cache *refs, const char *base,
- each_ref_entry_fn fn, void *cb_data)
-{
- struct packed_ref_cache *packed_ref_cache;
- struct ref_dir *loose_dir;
- struct ref_dir *packed_dir;
- int retval = 0;
-
- /*
- * We must make sure that all loose refs are read before accessing the
- * packed-refs file; this avoids a race condition in which loose refs
- * are migrated to the packed-refs file by a simultaneous process, but
- * our in-memory view is from before the migration. get_packed_ref_cache()
- * takes care of making sure our view is up to date with what is on
- * disk.
- */
- loose_dir = get_loose_refs(refs);
- if (base && *base) {
- loose_dir = find_containing_dir(loose_dir, base, 0);
- }
- if (loose_dir)
- prime_ref_dir(loose_dir);
-
- packed_ref_cache = get_packed_ref_cache(refs);
- acquire_packed_ref_cache(packed_ref_cache);
- packed_dir = get_packed_ref_dir(packed_ref_cache);
- if (base && *base) {
- packed_dir = find_containing_dir(packed_dir, base, 0);
- }
-
- if (packed_dir && loose_dir) {
- sort_ref_dir(packed_dir);
- sort_ref_dir(loose_dir);
- retval = do_for_each_entry_in_dirs(
- packed_dir, loose_dir, fn, cb_data);
- } else if (packed_dir) {
- sort_ref_dir(packed_dir);
- retval = do_for_each_entry_in_dir(
- packed_dir, 0, fn, cb_data);
- } else if (loose_dir) {
- sort_ref_dir(loose_dir);
- retval = do_for_each_entry_in_dir(
- loose_dir, 0, fn, cb_data);
- }
+struct files_ref_iterator {
+ struct ref_iterator base;
- release_packed_ref_cache(packed_ref_cache);
- return retval;
-}
+ struct ref_iterator *iter0;
+ unsigned int flags;
+};
-/*
- * Call fn for each reference in the specified ref_cache for which the
- * refname begins with base. If trim is non-zero, then trim that many
- * characters off the beginning of each refname before passing the
- * refname to fn. flags can be DO_FOR_EACH_INCLUDE_BROKEN to include
- * broken references in the iteration. If fn ever returns a non-zero
- * value, stop the iteration and return that value; otherwise, return
- * 0.
- */
-static int do_for_each_ref(struct ref_cache *refs, const char *base,
- each_ref_fn fn, int trim, int flags, void *cb_data)
+static int files_ref_iterator_advance(struct ref_iterator *ref_iterator)
{
- struct ref_entry_cb data;
- data.base = base;
- data.trim = trim;
- data.flags = flags;
- data.fn = fn;
- data.cb_data = cb_data;
-
- if (ref_paranoia < 0)
- ref_paranoia = git_env_bool("GIT_REF_PARANOIA", 0);
- if (ref_paranoia)
- data.flags |= DO_FOR_EACH_INCLUDE_BROKEN;
-
- return do_for_each_entry(refs, base, do_one_ref, &data);
-}
+ struct files_ref_iterator *iter =
+ (struct files_ref_iterator *)ref_iterator;
+ int ok;
-static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data)
-{
- struct object_id oid;
- int flag;
+ while ((ok = ref_iterator_advance(iter->iter0)) == ITER_OK) {
+ if (iter->flags & DO_FOR_EACH_PER_WORKTREE_ONLY &&
+ ref_type(iter->iter0->refname) != REF_TYPE_PER_WORKTREE)
+ continue;
- if (submodule) {
- if (resolve_gitlink_ref(submodule, "HEAD", oid.hash) == 0)
- return fn("HEAD", &oid, 0, cb_data);
+ if (!(iter->flags & DO_FOR_EACH_INCLUDE_BROKEN) &&
+ !ref_resolves_to_object(iter->iter0->refname,
+ iter->iter0->oid,
+ iter->iter0->flags))
+ continue;
- return 0;
+ iter->base.refname = iter->iter0->refname;
+ iter->base.oid = iter->iter0->oid;
+ iter->base.flags = iter->iter0->flags;
+ return ITER_OK;
}
- if (!read_ref_full("HEAD", RESOLVE_REF_READING, oid.hash, &flag))
- return fn("HEAD", &oid, flag, cb_data);
+ iter->iter0 = NULL;
+ if (ref_iterator_abort(ref_iterator) != ITER_DONE)
+ ok = ITER_ERROR;
- return 0;
+ return ok;
}
-int head_ref(each_ref_fn fn, void *cb_data)
+static int files_ref_iterator_peel(struct ref_iterator *ref_iterator,
+ struct object_id *peeled)
{
- return do_head_ref(NULL, fn, cb_data);
-}
+ struct files_ref_iterator *iter =
+ (struct files_ref_iterator *)ref_iterator;
-int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
-{
- return do_head_ref(submodule, fn, cb_data);
+ return ref_iterator_peel(iter->iter0, peeled);
}
-int for_each_ref(each_ref_fn fn, void *cb_data)
+static int files_ref_iterator_abort(struct ref_iterator *ref_iterator)
{
- return do_for_each_ref(&ref_cache, "", fn, 0, 0, cb_data);
-}
+ struct files_ref_iterator *iter =
+ (struct files_ref_iterator *)ref_iterator;
+ int ok = ITER_DONE;
-int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
-{
- return do_for_each_ref(get_ref_cache(submodule), "", fn, 0, 0, cb_data);
-}
+ if (iter->iter0)
+ ok = ref_iterator_abort(iter->iter0);
-int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data)
-{
- return do_for_each_ref(&ref_cache, prefix, fn, strlen(prefix), 0, cb_data);
+ base_ref_iterator_free(ref_iterator);
+ return ok;
}
-int for_each_fullref_in(const char *prefix, each_ref_fn fn, void *cb_data, unsigned int broken)
+static struct ref_iterator_vtable files_ref_iterator_vtable = {
+ files_ref_iterator_advance,
+ files_ref_iterator_peel,
+ files_ref_iterator_abort
+};
+
+static struct ref_iterator *files_ref_iterator_begin(
+ struct ref_store *ref_store,
+ const char *prefix, unsigned int flags)
{
- unsigned int flag = 0;
+ struct files_ref_store *refs;
+ struct ref_iterator *loose_iter, *packed_iter;
+ struct files_ref_iterator *iter;
+ struct ref_iterator *ref_iterator;
+ unsigned int required_flags = REF_STORE_READ;
- if (broken)
- flag = DO_FOR_EACH_INCLUDE_BROKEN;
- return do_for_each_ref(&ref_cache, prefix, fn, 0, flag, cb_data);
-}
+ if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN))
+ required_flags |= REF_STORE_ODB;
-int for_each_ref_in_submodule(const char *submodule, const char *prefix,
- each_ref_fn fn, void *cb_data)
-{
- return do_for_each_ref(get_ref_cache(submodule), prefix, fn, strlen(prefix), 0, cb_data);
-}
+ refs = files_downcast(ref_store, required_flags, "ref_iterator_begin");
-int for_each_replace_ref(each_ref_fn fn, void *cb_data)
-{
- return do_for_each_ref(&ref_cache, git_replace_ref_base, fn,
- strlen(git_replace_ref_base), 0, cb_data);
-}
+ iter = xcalloc(1, sizeof(*iter));
+ ref_iterator = &iter->base;
+ base_ref_iterator_init(ref_iterator, &files_ref_iterator_vtable);
-int for_each_namespaced_ref(each_ref_fn fn, void *cb_data)
-{
- struct strbuf buf = STRBUF_INIT;
- int ret;
- strbuf_addf(&buf, "%srefs/", get_git_namespace());
- ret = do_for_each_ref(&ref_cache, buf.buf, fn, 0, 0, cb_data);
- strbuf_release(&buf);
- return ret;
-}
+ /*
+ * We must make sure that all loose refs are read before
+ * accessing the packed-refs file; this avoids a race
+ * condition if loose refs are migrated to the packed-refs
+ * file by a simultaneous process, but our in-memory view is
+ * from before the migration. We ensure this as follows:
+ * First, we call start the loose refs iteration with its
+ * `prime_ref` argument set to true. This causes the loose
+ * references in the subtree to be pre-read into the cache.
+ * (If they've already been read, that's OK; we only need to
+ * guarantee that they're read before the packed refs, not
+ * *how much* before.) After that, we call
+ * packed_ref_iterator_begin(), which internally checks
+ * whether the packed-ref cache is up to date with what is on
+ * disk, and re-reads it if not.
+ */
-int for_each_rawref(each_ref_fn fn, void *cb_data)
-{
- return do_for_each_ref(&ref_cache, "", fn, 0,
- DO_FOR_EACH_INCLUDE_BROKEN, cb_data);
-}
+ loose_iter = cache_ref_iterator_begin(get_loose_ref_cache(refs),
+ prefix, 1);
-static void unlock_ref(struct ref_lock *lock)
-{
- /* Do not free lock->lk -- atexit() still looks at them */
- if (lock->lk)
- rollback_lock_file(lock->lk);
- free(lock->ref_name);
- free(lock->orig_ref_name);
- free(lock);
+ /*
+ * The packed-refs file might contain broken references, for
+ * example an old version of a reference that points at an
+ * object that has since been garbage-collected. This is OK as
+ * long as there is a corresponding loose reference that
+ * overrides it, and we don't want to emit an error message in
+ * this case. So ask the packed_ref_store for all of its
+ * references, and (if needed) do our own check for broken
+ * ones in files_ref_iterator_advance(), after we have merged
+ * the packed and loose references.
+ */
+ packed_iter = refs_ref_iterator_begin(
+ refs->packed_ref_store, prefix, 0,
+ DO_FOR_EACH_INCLUDE_BROKEN);
+
+ iter->iter0 = overlay_ref_iterator_begin(loose_iter, packed_iter);
+ iter->flags = flags;
+
+ return ref_iterator;
}
/*
* on success. On error, write an error message to err, set errno, and
* return a negative value.
*/
-static int verify_lock(struct ref_lock *lock,
+static int verify_lock(struct ref_store *ref_store, struct ref_lock *lock,
const unsigned char *old_sha1, int mustexist,
struct strbuf *err)
{
assert(err);
- if (read_ref_full(lock->ref_name,
- mustexist ? RESOLVE_REF_READING : 0,
- lock->old_oid.hash, NULL)) {
+ if (refs_read_ref_full(ref_store, lock->ref_name,
+ mustexist ? RESOLVE_REF_READING : 0,
+ lock->old_oid.hash, NULL)) {
if (old_sha1) {
int save_errno = errno;
- strbuf_addf(err, "can't verify ref %s", lock->ref_name);
+ strbuf_addf(err, "can't verify ref '%s'", lock->ref_name);
errno = save_errno;
return -1;
} else {
- hashclr(lock->old_oid.hash);
+ oidclr(&lock->old_oid);
return 0;
}
}
if (old_sha1 && hashcmp(lock->old_oid.hash, old_sha1)) {
- strbuf_addf(err, "ref %s is at %s but expected %s",
+ strbuf_addf(err, "ref '%s' is at %s but expected %s",
lock->ref_name,
- sha1_to_hex(lock->old_oid.hash),
+ oid_to_hex(&lock->old_oid),
sha1_to_hex(old_sha1));
errno = EBUSY;
return -1;
return remove_dir_recursively(path, REMOVE_DIR_EMPTY_ONLY);
}
+static int create_reflock(const char *path, void *cb)
+{
+ struct lock_file *lk = cb;
+
+ return hold_lock_file_for_update(lk, path, LOCK_NO_DEREF) < 0 ? -1 : 0;
+}
+
/*
* Locks a ref returning the lock on success and NULL on failure.
* On failure errno is set to something meaningful.
*/
-static struct ref_lock *lock_ref_sha1_basic(const char *refname,
+static struct ref_lock *lock_ref_sha1_basic(struct files_ref_store *refs,
+ const char *refname,
const unsigned char *old_sha1,
const struct string_list *extras,
const struct string_list *skip,
- unsigned int flags, int *type_p,
+ unsigned int flags, int *type,
struct strbuf *err)
{
struct strbuf ref_file = STRBUF_INIT;
- struct strbuf orig_ref_file = STRBUF_INIT;
- const char *orig_refname = refname;
struct ref_lock *lock;
int last_errno = 0;
- int type;
- int lflags = 0;
int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
- int resolve_flags = 0;
- int attempts_remaining = 3;
+ int resolve_flags = RESOLVE_REF_NO_RECURSE;
+ int resolved;
+ files_assert_main_repository(refs, "lock_ref_sha1_basic");
assert(err);
lock = xcalloc(1, sizeof(struct ref_lock));
resolve_flags |= RESOLVE_REF_READING;
if (flags & REF_DELETING)
resolve_flags |= RESOLVE_REF_ALLOW_BAD_NAME;
- if (flags & REF_NODEREF) {
- resolve_flags |= RESOLVE_REF_NO_RECURSE;
- lflags |= LOCK_NO_DEREF;
- }
- refname = resolve_ref_unsafe(refname, resolve_flags,
- lock->old_oid.hash, &type);
- if (!refname && errno == EISDIR) {
+ files_ref_path(refs, &ref_file, refname);
+ resolved = !!refs_resolve_ref_unsafe(&refs->base,
+ refname, resolve_flags,
+ lock->old_oid.hash, type);
+ if (!resolved && errno == EISDIR) {
/*
* we are trying to lock foo but we used to
* have foo/bar which now does not exist;
* it is normal for the empty directory 'foo'
* to remain.
*/
- strbuf_git_path(&orig_ref_file, "%s", orig_refname);
- if (remove_empty_directories(&orig_ref_file)) {
+ if (remove_empty_directories(&ref_file)) {
last_errno = errno;
- if (!verify_refname_available_dir(orig_refname, extras, skip,
- get_loose_refs(&ref_cache), err))
+ if (!refs_verify_refname_available(
+ &refs->base,
+ refname, extras, skip, err))
strbuf_addf(err, "there are still refs under '%s'",
- orig_refname);
+ refname);
goto error_return;
}
- refname = resolve_ref_unsafe(orig_refname, resolve_flags,
- lock->old_oid.hash, &type);
+ resolved = !!refs_resolve_ref_unsafe(&refs->base,
+ refname, resolve_flags,
+ lock->old_oid.hash, type);
}
- if (type_p)
- *type_p = type;
- if (!refname) {
+ if (!resolved) {
last_errno = errno;
if (last_errno != ENOTDIR ||
- !verify_refname_available_dir(orig_refname, extras, skip,
- get_loose_refs(&ref_cache), err))
- strbuf_addf(err, "unable to resolve reference %s: %s",
- orig_refname, strerror(last_errno));
+ !refs_verify_refname_available(&refs->base, refname,
+ extras, skip, err))
+ strbuf_addf(err, "unable to resolve reference '%s': %s",
+ refname, strerror(last_errno));
goto error_return;
}
- if (flags & REF_NODEREF)
- refname = orig_refname;
-
/*
* If the ref did not exist and we are creating it, make sure
* there is no existing packed ref whose name begins with our
* refname, nor a packed ref whose name is a proper prefix of
* our refname.
- */
- if (is_null_oid(&lock->old_oid) &&
- verify_refname_available_dir(refname, extras, skip,
- get_packed_refs(&ref_cache), err)) {
- last_errno = ENOTDIR;
- goto error_return;
- }
-
- lock->lk = xcalloc(1, sizeof(struct lock_file));
-
- lock->ref_name = xstrdup(refname);
- lock->orig_ref_name = xstrdup(orig_refname);
- strbuf_git_path(&ref_file, "%s", refname);
-
- retry:
- switch (safe_create_leading_directories_const(ref_file.buf)) {
- case SCLD_OK:
- break; /* success */
- case SCLD_VANISHED:
- if (--attempts_remaining > 0)
- goto retry;
- /* fall through */
- default:
- last_errno = errno;
- strbuf_addf(err, "unable to create directory for %s",
- ref_file.buf);
- goto error_return;
- }
-
- if (hold_lock_file_for_update(lock->lk, ref_file.buf, lflags) < 0) {
- last_errno = errno;
- if (errno == ENOENT && --attempts_remaining > 0)
- /*
- * Maybe somebody just deleted one of the
- * directories leading to ref_file. Try
- * again:
- */
- goto retry;
- else {
- unable_to_lock_message(ref_file.buf, errno, err);
- goto error_return;
- }
- }
- if (verify_lock(lock, old_sha1, mustexist, err)) {
- last_errno = errno;
- goto error_return;
- }
- goto out;
-
- error_return:
- unlock_ref(lock);
- lock = NULL;
-
- out:
- strbuf_release(&ref_file);
- strbuf_release(&orig_ref_file);
- errno = last_errno;
- return lock;
-}
-
-/*
- * Write an entry to the packed-refs file for the specified refname.
- * If peeled is non-NULL, write it as the entry's peeled value.
- */
-static void write_packed_entry(FILE *fh, char *refname, unsigned char *sha1,
- unsigned char *peeled)
-{
- fprintf_or_die(fh, "%s %s\n", sha1_to_hex(sha1), refname);
- if (peeled)
- fprintf_or_die(fh, "^%s\n", sha1_to_hex(peeled));
-}
-
-/*
- * An each_ref_entry_fn that writes the entry to a packed-refs file.
- */
-static int write_packed_entry_fn(struct ref_entry *entry, void *cb_data)
-{
- enum peel_status peel_status = peel_entry(entry, 0);
-
- if (peel_status != PEEL_PEELED && peel_status != PEEL_NON_TAG)
- error("internal error: %s is not a valid packed reference!",
- entry->name);
- write_packed_entry(cb_data, entry->name, entry->u.value.oid.hash,
- peel_status == PEEL_PEELED ?
- entry->u.value.peeled.hash : NULL);
- return 0;
-}
-
-/*
- * Lock the packed-refs file for writing. Flags is passed to
- * hold_lock_file_for_update(). Return 0 on success. On errors, set
- * errno appropriately and return a nonzero value.
- */
-static int lock_packed_refs(int flags)
-{
- static int timeout_configured = 0;
- static int timeout_value = 1000;
-
- struct packed_ref_cache *packed_ref_cache;
-
- if (!timeout_configured) {
- git_config_get_int("core.packedrefstimeout", &timeout_value);
- timeout_configured = 1;
- }
-
- if (hold_lock_file_for_update_timeout(
- &packlock, git_path("packed-refs"),
- flags, timeout_value) < 0)
- return -1;
- /*
- * Get the current packed-refs while holding the lock. If the
- * packed-refs file has been modified since we last read it,
- * this will automatically invalidate the cache and re-read
- * the packed-refs file.
- */
- packed_ref_cache = get_packed_ref_cache(&ref_cache);
- packed_ref_cache->lock = &packlock;
- /* Increment the reference count to prevent it from being freed: */
- acquire_packed_ref_cache(packed_ref_cache);
- return 0;
-}
-
-/*
- * Write the current version of the packed refs cache from memory to
- * disk. The packed-refs file must already be locked for writing (see
- * lock_packed_refs()). Return zero on success. On errors, set errno
- * and return a nonzero value
- */
-static int commit_packed_refs(void)
-{
- struct packed_ref_cache *packed_ref_cache =
- get_packed_ref_cache(&ref_cache);
- int error = 0;
- int save_errno = 0;
- FILE *out;
+ */
+ if (is_null_oid(&lock->old_oid) &&
+ refs_verify_refname_available(refs->packed_ref_store, refname,
+ extras, skip, err)) {
+ last_errno = ENOTDIR;
+ goto error_return;
+ }
- if (!packed_ref_cache->lock)
- die("internal error: packed-refs not locked");
+ lock->lk = xcalloc(1, sizeof(struct lock_file));
- out = fdopen_lock_file(packed_ref_cache->lock, "w");
- if (!out)
- die_errno("unable to fdopen packed-refs descriptor");
+ lock->ref_name = xstrdup(refname);
- fprintf_or_die(out, "%s", PACKED_REFS_HEADER);
- do_for_each_entry_in_dir(get_packed_ref_dir(packed_ref_cache),
- 0, write_packed_entry_fn, out);
+ if (raceproof_create_file(ref_file.buf, create_reflock, lock->lk)) {
+ last_errno = errno;
+ unable_to_lock_message(ref_file.buf, errno, err);
+ goto error_return;
+ }
- if (commit_lock_file(packed_ref_cache->lock)) {
- save_errno = errno;
- error = -1;
+ if (verify_lock(&refs->base, lock, old_sha1, mustexist, err)) {
+ last_errno = errno;
+ goto error_return;
}
- packed_ref_cache->lock = NULL;
- release_packed_ref_cache(packed_ref_cache);
- errno = save_errno;
- return error;
-}
+ goto out;
-/*
- * Rollback the lockfile for the packed-refs file, and discard the
- * in-memory packed reference cache. (The packed-refs file will be
- * read anew if it is needed again after this function is called.)
- */
-static void rollback_packed_refs(void)
-{
- struct packed_ref_cache *packed_ref_cache =
- get_packed_ref_cache(&ref_cache);
+ error_return:
+ unlock_ref(lock);
+ lock = NULL;
- if (!packed_ref_cache->lock)
- die("internal error: packed-refs not locked");
- rollback_lock_file(packed_ref_cache->lock);
- packed_ref_cache->lock = NULL;
- release_packed_ref_cache(packed_ref_cache);
- clear_packed_ref_cache(&ref_cache);
+ out:
+ strbuf_release(&ref_file);
+ errno = last_errno;
+ return lock;
}
struct ref_to_prune {
char name[FLEX_ARRAY];
};
-struct pack_refs_cb_data {
- unsigned int flags;
- struct ref_dir *packed_refs;
- struct ref_to_prune *ref_to_prune;
+enum {
+ REMOVE_EMPTY_PARENTS_REF = 0x01,
+ REMOVE_EMPTY_PARENTS_REFLOG = 0x02
};
/*
- * An each_ref_entry_fn that is run over loose references only. If
- * the loose reference can be packed, add an entry in the packed ref
- * cache. If the reference should be pruned, also add it to
- * ref_to_prune in the pack_refs_cb_data.
- */
-static int pack_if_possible_fn(struct ref_entry *entry, void *cb_data)
-{
- struct pack_refs_cb_data *cb = cb_data;
- enum peel_status peel_status;
- struct ref_entry *packed_entry;
- int is_tag_ref = starts_with(entry->name, "refs/tags/");
-
- /* Do not pack per-worktree refs: */
- if (ref_type(entry->name) != REF_TYPE_NORMAL)
- return 0;
-
- /* ALWAYS pack tags */
- if (!(cb->flags & PACK_REFS_ALL) && !is_tag_ref)
- return 0;
-
- /* Do not pack symbolic or broken refs: */
- if ((entry->flag & REF_ISSYMREF) || !ref_resolves_to_object(entry))
- return 0;
-
- /* Add a packed ref cache entry equivalent to the loose entry. */
- peel_status = peel_entry(entry, 1);
- if (peel_status != PEEL_PEELED && peel_status != PEEL_NON_TAG)
- die("internal error peeling reference %s (%s)",
- entry->name, oid_to_hex(&entry->u.value.oid));
- packed_entry = find_ref(cb->packed_refs, entry->name);
- if (packed_entry) {
- /* Overwrite existing packed entry with info from loose entry */
- packed_entry->flag = REF_ISPACKED | REF_KNOWS_PEELED;
- oidcpy(&packed_entry->u.value.oid, &entry->u.value.oid);
- } else {
- packed_entry = create_ref_entry(entry->name, entry->u.value.oid.hash,
- REF_ISPACKED | REF_KNOWS_PEELED, 0);
- add_ref(cb->packed_refs, packed_entry);
- }
- oidcpy(&packed_entry->u.value.peeled, &entry->u.value.peeled);
-
- /* Schedule the loose reference for pruning if requested. */
- if ((cb->flags & PACK_REFS_PRUNE)) {
- struct ref_to_prune *n;
- FLEX_ALLOC_STR(n, name, entry->name);
- hashcpy(n->sha1, entry->u.value.oid.hash);
- n->next = cb->ref_to_prune;
- cb->ref_to_prune = n;
- }
- return 0;
-}
-
-/*
- * Remove empty parents, but spare refs/ and immediate subdirs.
- * Note: munges *name.
+ * Remove empty parent directories associated with the specified
+ * reference and/or its reflog, but spare [logs/]refs/ and immediate
+ * subdirs. flags is a combination of REMOVE_EMPTY_PARENTS_REF and/or
+ * REMOVE_EMPTY_PARENTS_REFLOG.
*/
-static void try_remove_empty_parents(char *name)
+static void try_remove_empty_parents(struct files_ref_store *refs,
+ const char *refname,
+ unsigned int flags)
{
+ struct strbuf buf = STRBUF_INIT;
+ struct strbuf sb = STRBUF_INIT;
char *p, *q;
int i;
- p = name;
+
+ strbuf_addstr(&buf, refname);
+ p = buf.buf;
for (i = 0; i < 2; i++) { /* refs/{heads,tags,...}/ */
while (*p && *p != '/')
p++;
while (*p == '/')
p++;
}
- for (q = p; *q; q++)
- ;
- while (1) {
+ q = buf.buf + buf.len;
+ while (flags & (REMOVE_EMPTY_PARENTS_REF | REMOVE_EMPTY_PARENTS_REFLOG)) {
while (q > p && *q != '/')
q--;
while (q > p && *(q-1) == '/')
q--;
if (q == p)
break;
- *q = '\0';
- if (rmdir(git_path("%s", name)))
- break;
+ strbuf_setlen(&buf, q - buf.buf);
+
+ strbuf_reset(&sb);
+ files_ref_path(refs, &sb, buf.buf);
+ if ((flags & REMOVE_EMPTY_PARENTS_REF) && rmdir(sb.buf))
+ flags &= ~REMOVE_EMPTY_PARENTS_REF;
+
+ strbuf_reset(&sb);
+ files_reflog_path(refs, &sb, buf.buf);
+ if ((flags & REMOVE_EMPTY_PARENTS_REFLOG) && rmdir(sb.buf))
+ flags &= ~REMOVE_EMPTY_PARENTS_REFLOG;
}
+ strbuf_release(&buf);
+ strbuf_release(&sb);
}
/* make sure nobody touched the ref, and unlink */
-static void prune_ref(struct ref_to_prune *r)
+static void prune_ref(struct files_ref_store *refs, struct ref_to_prune *r)
{
struct ref_transaction *transaction;
struct strbuf err = STRBUF_INIT;
if (check_refname_format(r->name, 0))
return;
- transaction = ref_transaction_begin(&err);
+ transaction = ref_store_transaction_begin(&refs->base, &err);
if (!transaction ||
ref_transaction_delete(transaction, r->name, r->sha1,
- REF_ISPRUNING, NULL, &err) ||
+ REF_ISPRUNING | REF_NODEREF, NULL, &err) ||
ref_transaction_commit(transaction, &err)) {
ref_transaction_free(transaction);
error("%s", err.buf);
}
ref_transaction_free(transaction);
strbuf_release(&err);
- try_remove_empty_parents(r->name);
}
-static void prune_refs(struct ref_to_prune *r)
+static void prune_refs(struct files_ref_store *refs, struct ref_to_prune *r)
{
while (r) {
- prune_ref(r);
+ prune_ref(refs, r);
r = r->next;
}
}
-int pack_refs(unsigned int flags)
+/*
+ * Return true if the specified reference should be packed.
+ */
+static int should_pack_ref(const char *refname,
+ const struct object_id *oid, unsigned int ref_flags,
+ unsigned int pack_flags)
{
- struct pack_refs_cb_data cbdata;
-
- memset(&cbdata, 0, sizeof(cbdata));
- cbdata.flags = flags;
+ /* Do not pack per-worktree refs: */
+ if (ref_type(refname) != REF_TYPE_NORMAL)
+ return 0;
- lock_packed_refs(LOCK_DIE_ON_ERROR);
- cbdata.packed_refs = get_packed_refs(&ref_cache);
+ /* Do not pack non-tags unless PACK_REFS_ALL is set: */
+ if (!(pack_flags & PACK_REFS_ALL) && !starts_with(refname, "refs/tags/"))
+ return 0;
- do_for_each_entry_in_dir(get_loose_refs(&ref_cache), 0,
- pack_if_possible_fn, &cbdata);
+ /* Do not pack symbolic refs: */
+ if (ref_flags & REF_ISSYMREF)
+ return 0;
- if (commit_packed_refs())
- die_errno("unable to overwrite old ref-pack file");
+ /* Do not pack broken refs: */
+ if (!ref_resolves_to_object(refname, oid, ref_flags))
+ return 0;
- prune_refs(cbdata.ref_to_prune);
- return 0;
+ return 1;
}
-/*
- * Rewrite the packed-refs file, omitting any refs listed in
- * 'refnames'. On error, leave packed-refs unchanged, write an error
- * message to 'err', and return a nonzero value.
- *
- * The refs in 'refnames' needn't be sorted. `err` must not be NULL.
- */
-static int repack_without_refs(struct string_list *refnames, struct strbuf *err)
+static int files_pack_refs(struct ref_store *ref_store, unsigned int flags)
{
- struct ref_dir *packed;
- struct string_list_item *refname;
- int ret, needs_repacking = 0, removed = 0;
-
- assert(err);
-
- /* Look for a packed ref */
- for_each_string_list_item(refname, refnames) {
- if (get_packed_ref(refname->string)) {
- needs_repacking = 1;
- break;
- }
- }
-
- /* Avoid locking if we have nothing to do */
- if (!needs_repacking)
- return 0; /* no refname exists in packed refs */
+ struct files_ref_store *refs =
+ files_downcast(ref_store, REF_STORE_WRITE | REF_STORE_ODB,
+ "pack_refs");
+ struct ref_iterator *iter;
+ int ok;
+ struct ref_to_prune *refs_to_prune = NULL;
+ struct strbuf err = STRBUF_INIT;
- if (lock_packed_refs(0)) {
- unable_to_lock_message(git_path("packed-refs"), errno, err);
- return -1;
- }
- packed = get_packed_refs(&ref_cache);
+ packed_refs_lock(refs->packed_ref_store, LOCK_DIE_ON_ERROR, &err);
- /* Remove refnames from the cache */
- for_each_string_list_item(refname, refnames)
- if (remove_entry(packed, refname->string) != -1)
- removed = 1;
- if (!removed) {
+ iter = cache_ref_iterator_begin(get_loose_ref_cache(refs), NULL, 0);
+ while ((ok = ref_iterator_advance(iter)) == ITER_OK) {
/*
- * All packed entries disappeared while we were
- * acquiring the lock.
+ * If the loose reference can be packed, add an entry
+ * in the packed ref cache. If the reference should be
+ * pruned, also add it to refs_to_prune.
*/
- rollback_packed_refs();
- return 0;
- }
-
- /* Write what remains */
- ret = commit_packed_refs();
- if (ret)
- strbuf_addf(err, "unable to overwrite old ref-pack file: %s",
- strerror(errno));
- return ret;
-}
-
-static int delete_ref_loose(struct ref_lock *lock, int flag, struct strbuf *err)
-{
- assert(err);
+ if (!should_pack_ref(iter->refname, iter->oid, iter->flags,
+ flags))
+ continue;
- if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) {
/*
- * loose. The loose file name is the same as the
- * lockfile name, minus ".lock":
+ * Create an entry in the packed-refs cache equivalent
+ * to the one from the loose ref cache, except that
+ * we don't copy the peeled status, because we want it
+ * to be re-peeled.
*/
- char *loose_filename = get_locked_file_path(lock->lk);
- int res = unlink_or_msg(loose_filename, err);
- free(loose_filename);
- if (res)
- return 1;
+ add_packed_ref(refs->packed_ref_store, iter->refname, iter->oid);
+
+ /* Schedule the loose reference for pruning if requested. */
+ if ((flags & PACK_REFS_PRUNE)) {
+ struct ref_to_prune *n;
+ FLEX_ALLOC_STR(n, name, iter->refname);
+ hashcpy(n->sha1, iter->oid->hash);
+ n->next = refs_to_prune;
+ refs_to_prune = n;
+ }
}
+ if (ok != ITER_DONE)
+ die("error while iterating over references");
+
+ if (commit_packed_refs(refs->packed_ref_store, &err))
+ die("unable to overwrite old ref-pack file: %s", err.buf);
+ packed_refs_unlock(refs->packed_ref_store);
+
+ prune_refs(refs, refs_to_prune);
+ strbuf_release(&err);
return 0;
}
-int delete_refs(struct string_list *refnames)
+static int files_delete_refs(struct ref_store *ref_store, const char *msg,
+ struct string_list *refnames, unsigned int flags)
{
+ struct files_ref_store *refs =
+ files_downcast(ref_store, REF_STORE_WRITE, "delete_refs");
struct strbuf err = STRBUF_INIT;
int i, result = 0;
if (!refnames->nr)
return 0;
- result = repack_without_refs(refnames, &err);
- if (result) {
- /*
- * If we failed to rewrite the packed-refs file, then
- * it is unsafe to try to remove loose refs, because
- * doing so might expose an obsolete packed value for
- * a reference that might even point at an object that
- * has been garbage collected.
- */
- if (refnames->nr == 1)
- error(_("could not delete reference %s: %s"),
- refnames->items[0].string, err.buf);
- else
- error(_("could not delete references: %s"), err.buf);
+ if (packed_refs_lock(refs->packed_ref_store, 0, &err))
+ goto error;
- goto out;
+ if (repack_without_refs(refs->packed_ref_store, refnames, &err)) {
+ packed_refs_unlock(refs->packed_ref_store);
+ goto error;
}
+ packed_refs_unlock(refs->packed_ref_store);
+
for (i = 0; i < refnames->nr; i++) {
const char *refname = refnames->items[i].string;
- if (delete_ref(refname, NULL, 0))
+ if (refs_delete_ref(&refs->base, msg, refname, NULL, flags))
result |= error(_("could not remove reference %s"), refname);
}
-out:
strbuf_release(&err);
return result;
+
+error:
+ /*
+ * If we failed to rewrite the packed-refs file, then it is
+ * unsafe to try to remove loose refs, because doing so might
+ * expose an obsolete packed value for a reference that might
+ * even point at an object that has been garbage collected.
+ */
+ if (refnames->nr == 1)
+ error(_("could not delete reference %s: %s"),
+ refnames->items[0].string, err.buf);
+ else
+ error(_("could not delete references: %s"), err.buf);
+
+ strbuf_release(&err);
+ return -1;
}
/*
* IOW, to avoid cross device rename errors, the temporary renamed log must
* live into logs/refs.
*/
-#define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
+#define TMP_RENAMED_LOG "refs/.tmp-renamed-log"
-static int rename_tmp_log(const char *newrefname)
-{
- int attempts_remaining = 4;
- struct strbuf path = STRBUF_INIT;
- int ret = -1;
+struct rename_cb {
+ const char *tmp_renamed_log;
+ int true_errno;
+};
- retry:
- strbuf_reset(&path);
- strbuf_git_path(&path, "logs/%s", newrefname);
- switch (safe_create_leading_directories_const(path.buf)) {
- case SCLD_OK:
- break; /* success */
- case SCLD_VANISHED:
- if (--attempts_remaining > 0)
- goto retry;
- /* fall through */
- default:
- error("unable to create directory for %s", newrefname);
- goto out;
- }
+static int rename_tmp_log_callback(const char *path, void *cb_data)
+{
+ struct rename_cb *cb = cb_data;
- if (rename(git_path(TMP_RENAMED_LOG), path.buf)) {
- if ((errno==EISDIR || errno==ENOTDIR) && --attempts_remaining > 0) {
- /*
- * rename(a, b) when b is an existing
- * directory ought to result in ISDIR, but
- * Solaris 5.8 gives ENOTDIR. Sheesh.
- */
- if (remove_empty_directories(&path)) {
- error("Directory not empty: logs/%s", newrefname);
- goto out;
- }
- goto retry;
- } else if (errno == ENOENT && --attempts_remaining > 0) {
- /*
- * Maybe another process just deleted one of
- * the directories in the path to newrefname.
- * Try again from the beginning.
- */
- goto retry;
- } else {
- error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s",
- newrefname, strerror(errno));
- goto out;
- }
+ if (rename(cb->tmp_renamed_log, path)) {
+ /*
+ * rename(a, b) when b is an existing directory ought
+ * to result in ISDIR, but Solaris 5.8 gives ENOTDIR.
+ * Sheesh. Record the true errno for error reporting,
+ * but report EISDIR to raceproof_create_file() so
+ * that it knows to retry.
+ */
+ cb->true_errno = errno;
+ if (errno == ENOTDIR)
+ errno = EISDIR;
+ return -1;
+ } else {
+ return 0;
}
- ret = 0;
-out:
- strbuf_release(&path);
- return ret;
}
-int verify_refname_available(const char *newname,
- struct string_list *extras,
- struct string_list *skip,
- struct strbuf *err)
+static int rename_tmp_log(struct files_ref_store *refs, const char *newrefname)
{
- struct ref_dir *packed_refs = get_packed_refs(&ref_cache);
- struct ref_dir *loose_refs = get_loose_refs(&ref_cache);
+ struct strbuf path = STRBUF_INIT;
+ struct strbuf tmp = STRBUF_INIT;
+ struct rename_cb cb;
+ int ret;
- if (verify_refname_available_dir(newname, extras, skip,
- packed_refs, err) ||
- verify_refname_available_dir(newname, extras, skip,
- loose_refs, err))
- return -1;
+ files_reflog_path(refs, &path, newrefname);
+ files_reflog_path(refs, &tmp, TMP_RENAMED_LOG);
+ cb.tmp_renamed_log = tmp.buf;
+ ret = raceproof_create_file(path.buf, rename_tmp_log_callback, &cb);
+ if (ret) {
+ if (errno == EISDIR)
+ error("directory not empty: %s", path.buf);
+ else
+ error("unable to move logfile %s to %s: %s",
+ tmp.buf, path.buf,
+ strerror(cb.true_errno));
+ }
- return 0;
+ strbuf_release(&path);
+ strbuf_release(&tmp);
+ return ret;
}
static int write_ref_to_lockfile(struct ref_lock *lock,
- const unsigned char *sha1, struct strbuf *err);
-static int commit_ref_update(struct ref_lock *lock,
- const unsigned char *sha1, const char *logmsg,
- int flags, struct strbuf *err);
-
-int rename_ref(const char *oldrefname, const char *newrefname, const char *logmsg)
-{
- unsigned char sha1[20], orig_sha1[20];
+ const struct object_id *oid, struct strbuf *err);
+static int commit_ref_update(struct files_ref_store *refs,
+ struct ref_lock *lock,
+ const struct object_id *oid, const char *logmsg,
+ struct strbuf *err);
+
+static int files_rename_ref(struct ref_store *ref_store,
+ const char *oldrefname, const char *newrefname,
+ const char *logmsg)
+{
+ struct files_ref_store *refs =
+ files_downcast(ref_store, REF_STORE_WRITE, "rename_ref");
+ struct object_id oid, orig_oid;
int flag = 0, logmoved = 0;
struct ref_lock *lock;
struct stat loginfo;
- int log = !lstat(git_path("logs/%s", oldrefname), &loginfo);
- const char *symref = NULL;
+ struct strbuf sb_oldref = STRBUF_INIT;
+ struct strbuf sb_newref = STRBUF_INIT;
+ struct strbuf tmp_renamed_log = STRBUF_INIT;
+ int log, ret;
struct strbuf err = STRBUF_INIT;
- if (log && S_ISLNK(loginfo.st_mode))
- return error("reflog for %s is a symlink", oldrefname);
+ files_reflog_path(refs, &sb_oldref, oldrefname);
+ files_reflog_path(refs, &sb_newref, newrefname);
+ files_reflog_path(refs, &tmp_renamed_log, TMP_RENAMED_LOG);
+
+ log = !lstat(sb_oldref.buf, &loginfo);
+ if (log && S_ISLNK(loginfo.st_mode)) {
+ ret = error("reflog for %s is a symlink", oldrefname);
+ goto out;
+ }
- symref = resolve_ref_unsafe(oldrefname, RESOLVE_REF_READING,
- orig_sha1, &flag);
- if (flag & REF_ISSYMREF)
- return error("refname %s is a symbolic ref, renaming it is not supported",
- oldrefname);
- if (!symref)
- return error("refname %s not found", oldrefname);
+ if (!refs_resolve_ref_unsafe(&refs->base, oldrefname,
+ RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE,
+ orig_oid.hash, &flag)) {
+ ret = error("refname %s not found", oldrefname);
+ goto out;
+ }
- if (!rename_ref_available(oldrefname, newrefname))
- return 1;
+ if (flag & REF_ISSYMREF) {
+ ret = error("refname %s is a symbolic ref, renaming it is not supported",
+ oldrefname);
+ goto out;
+ }
+ if (!refs_rename_ref_available(&refs->base, oldrefname, newrefname)) {
+ ret = 1;
+ goto out;
+ }
- if (log && rename(git_path("logs/%s", oldrefname), git_path(TMP_RENAMED_LOG)))
- return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s",
- oldrefname, strerror(errno));
+ if (log && rename(sb_oldref.buf, tmp_renamed_log.buf)) {
+ ret = error("unable to move logfile logs/%s to logs/"TMP_RENAMED_LOG": %s",
+ oldrefname, strerror(errno));
+ goto out;
+ }
- if (delete_ref(oldrefname, orig_sha1, REF_NODEREF)) {
+ if (refs_delete_ref(&refs->base, logmsg, oldrefname,
+ orig_oid.hash, REF_NODEREF)) {
error("unable to delete old %s", oldrefname);
goto rollback;
}
- if (!read_ref_full(newrefname, RESOLVE_REF_READING, sha1, NULL) &&
- delete_ref(newrefname, sha1, REF_NODEREF)) {
- if (errno==EISDIR) {
+ /*
+ * Since we are doing a shallow lookup, oid is not the
+ * correct value to pass to delete_ref as old_oid. But that
+ * doesn't matter, because an old_oid check wouldn't add to
+ * the safety anyway; we want to delete the reference whatever
+ * its current value.
+ */
+ if (!refs_read_ref_full(&refs->base, newrefname,
+ RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE,
+ oid.hash, NULL) &&
+ refs_delete_ref(&refs->base, NULL, newrefname,
+ NULL, REF_NODEREF)) {
+ if (errno == EISDIR) {
struct strbuf path = STRBUF_INIT;
int result;
- strbuf_git_path(&path, "%s", newrefname);
+ files_ref_path(refs, &path, newrefname);
result = remove_empty_directories(&path);
strbuf_release(&path);
}
}
- if (log && rename_tmp_log(newrefname))
+ if (log && rename_tmp_log(refs, newrefname))
goto rollback;
logmoved = log;
- lock = lock_ref_sha1_basic(newrefname, NULL, NULL, NULL, 0, NULL, &err);
+ lock = lock_ref_sha1_basic(refs, newrefname, NULL, NULL, NULL,
+ REF_NODEREF, NULL, &err);
if (!lock) {
error("unable to rename '%s' to '%s': %s", oldrefname, newrefname, err.buf);
strbuf_release(&err);
goto rollback;
}
- hashcpy(lock->old_oid.hash, orig_sha1);
+ oidcpy(&lock->old_oid, &orig_oid);
- if (write_ref_to_lockfile(lock, orig_sha1, &err) ||
- commit_ref_update(lock, orig_sha1, logmsg, 0, &err)) {
+ if (write_ref_to_lockfile(lock, &orig_oid, &err) ||
+ commit_ref_update(refs, lock, &orig_oid, logmsg, &err)) {
error("unable to write current sha1 into %s: %s", newrefname, err.buf);
strbuf_release(&err);
goto rollback;
}
- return 0;
+ ret = 0;
+ goto out;
rollback:
- lock = lock_ref_sha1_basic(oldrefname, NULL, NULL, NULL, 0, NULL, &err);
+ lock = lock_ref_sha1_basic(refs, oldrefname, NULL, NULL, NULL,
+ REF_NODEREF, NULL, &err);
if (!lock) {
error("unable to lock %s for rollback: %s", oldrefname, err.buf);
strbuf_release(&err);
}
flag = log_all_ref_updates;
- log_all_ref_updates = 0;
- if (write_ref_to_lockfile(lock, orig_sha1, &err) ||
- commit_ref_update(lock, orig_sha1, NULL, 0, &err)) {
+ log_all_ref_updates = LOG_REFS_NONE;
+ if (write_ref_to_lockfile(lock, &orig_oid, &err) ||
+ commit_ref_update(refs, lock, &orig_oid, NULL, &err)) {
error("unable to write current sha1 into %s: %s", oldrefname, err.buf);
strbuf_release(&err);
}
log_all_ref_updates = flag;
rollbacklog:
- if (logmoved && rename(git_path("logs/%s", newrefname), git_path("logs/%s", oldrefname)))
+ if (logmoved && rename(sb_newref.buf, sb_oldref.buf))
error("unable to restore logfile %s from %s: %s",
oldrefname, newrefname, strerror(errno));
if (!logmoved && log &&
- rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldrefname)))
- error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s",
+ rename(tmp_renamed_log.buf, sb_oldref.buf))
+ error("unable to restore logfile %s from logs/"TMP_RENAMED_LOG": %s",
oldrefname, strerror(errno));
+ ret = 1;
+ out:
+ strbuf_release(&sb_newref);
+ strbuf_release(&sb_oldref);
+ strbuf_release(&tmp_renamed_log);
- return 1;
+ return ret;
}
static int close_ref(struct ref_lock *lock)
static int commit_ref(struct ref_lock *lock)
{
+ char *path = get_locked_file_path(lock->lk);
+ struct stat st;
+
+ if (!lstat(path, &st) && S_ISDIR(st.st_mode)) {
+ /*
+ * There is a directory at the path we want to rename
+ * the lockfile to. Hopefully it is empty; try to
+ * delete it.
+ */
+ size_t len = strlen(path);
+ struct strbuf sb_path = STRBUF_INIT;
+
+ strbuf_attach(&sb_path, path, len, len);
+
+ /*
+ * If this fails, commit_lock_file() will also fail
+ * and will report the problem.
+ */
+ remove_empty_directories(&sb_path);
+ strbuf_release(&sb_path);
+ } else {
+ free(path);
+ }
+
if (commit_lock_file(lock->lk))
return -1;
return 0;
}
+static int open_or_create_logfile(const char *path, void *cb)
+{
+ int *fd = cb;
+
+ *fd = open(path, O_APPEND | O_WRONLY | O_CREAT, 0666);
+ return (*fd < 0) ? -1 : 0;
+}
+
/*
- * Create a reflog for a ref. If force_create = 0, the reflog will
- * only be created for certain refs (those for which
- * should_autocreate_reflog returns non-zero. Otherwise, create it
- * regardless of the ref name. Fill in *err and return -1 on failure.
+ * Create a reflog for a ref. If force_create = 0, only create the
+ * reflog for certain refs (those for which should_autocreate_reflog
+ * returns non-zero). Otherwise, create it regardless of the reference
+ * name. If the logfile already existed or was created, return 0 and
+ * set *logfd to the file descriptor opened for appending to the file.
+ * If no logfile exists and we decided not to create one, return 0 and
+ * set *logfd to -1. On failure, fill in *err, set *logfd to -1, and
+ * return -1.
*/
-static int log_ref_setup(const char *refname, struct strbuf *logfile, struct strbuf *err, int force_create)
+static int log_ref_setup(struct files_ref_store *refs,
+ const char *refname, int force_create,
+ int *logfd, struct strbuf *err)
{
- int logfd, oflags = O_APPEND | O_WRONLY;
+ struct strbuf logfile_sb = STRBUF_INIT;
+ char *logfile;
- strbuf_git_path(logfile, "logs/%s", refname);
- if (force_create || should_autocreate_reflog(refname)) {
- if (safe_create_leading_directories(logfile->buf) < 0) {
- strbuf_addf(err, "unable to create directory for %s: "
- "%s", logfile->buf, strerror(errno));
- return -1;
- }
- oflags |= O_CREAT;
- }
+ files_reflog_path(refs, &logfile_sb, refname);
+ logfile = strbuf_detach(&logfile_sb, NULL);
- logfd = open(logfile->buf, oflags, 0666);
- if (logfd < 0) {
- if (!(oflags & O_CREAT) && (errno == ENOENT || errno == EISDIR))
- return 0;
+ if (force_create || should_autocreate_reflog(refname)) {
+ if (raceproof_create_file(logfile, open_or_create_logfile, logfd)) {
+ if (errno == ENOENT)
+ strbuf_addf(err, "unable to create directory for '%s': "
+ "%s", logfile, strerror(errno));
+ else if (errno == EISDIR)
+ strbuf_addf(err, "there are still logs under '%s'",
+ logfile);
+ else
+ strbuf_addf(err, "unable to append to '%s': %s",
+ logfile, strerror(errno));
- if (errno == EISDIR) {
- if (remove_empty_directories(logfile)) {
- strbuf_addf(err, "There are still logs under "
- "'%s'", logfile->buf);
- return -1;
- }
- logfd = open(logfile->buf, oflags, 0666);
+ goto error;
}
-
- if (logfd < 0) {
- strbuf_addf(err, "unable to append to %s: %s",
- logfile->buf, strerror(errno));
- return -1;
+ } else {
+ *logfd = open(logfile, O_APPEND | O_WRONLY, 0666);
+ if (*logfd < 0) {
+ if (errno == ENOENT || errno == EISDIR) {
+ /*
+ * The logfile doesn't already exist,
+ * but that is not an error; it only
+ * means that we won't write log
+ * entries to it.
+ */
+ ;
+ } else {
+ strbuf_addf(err, "unable to append to '%s': %s",
+ logfile, strerror(errno));
+ goto error;
+ }
}
}
- adjust_shared_perm(logfile->buf);
- close(logfd);
+ if (*logfd >= 0)
+ adjust_shared_perm(logfile);
+
+ free(logfile);
return 0;
-}
+error:
+ free(logfile);
+ return -1;
+}
-int safe_create_reflog(const char *refname, int force_create, struct strbuf *err)
+static int files_create_reflog(struct ref_store *ref_store,
+ const char *refname, int force_create,
+ struct strbuf *err)
{
- int ret;
- struct strbuf sb = STRBUF_INIT;
+ struct files_ref_store *refs =
+ files_downcast(ref_store, REF_STORE_WRITE, "create_reflog");
+ int fd;
- ret = log_ref_setup(refname, &sb, err, force_create);
- strbuf_release(&sb);
- return ret;
+ if (log_ref_setup(refs, refname, force_create, &fd, err))
+ return -1;
+
+ if (fd >= 0)
+ close(fd);
+
+ return 0;
}
-static int log_ref_write_fd(int fd, const unsigned char *old_sha1,
- const unsigned char *new_sha1,
+static int log_ref_write_fd(int fd, const struct object_id *old_oid,
+ const struct object_id *new_oid,
const char *committer, const char *msg)
{
int msglen, written;
maxlen = strlen(committer) + msglen + 100;
logrec = xmalloc(maxlen);
len = xsnprintf(logrec, maxlen, "%s %s %s\n",
- sha1_to_hex(old_sha1),
- sha1_to_hex(new_sha1),
+ oid_to_hex(old_oid),
+ oid_to_hex(new_oid),
committer);
if (msglen)
len += copy_reflog_msg(logrec + len - 1, msg) - 1;
return 0;
}
-static int log_ref_write_1(const char *refname, const unsigned char *old_sha1,
- const unsigned char *new_sha1, const char *msg,
- struct strbuf *logfile, int flags,
- struct strbuf *err)
+static int files_log_ref_write(struct files_ref_store *refs,
+ const char *refname, const struct object_id *old_oid,
+ const struct object_id *new_oid, const char *msg,
+ int flags, struct strbuf *err)
{
- int logfd, result, oflags = O_APPEND | O_WRONLY;
+ int logfd, result;
- if (log_all_ref_updates < 0)
- log_all_ref_updates = !is_bare_repository();
+ if (log_all_ref_updates == LOG_REFS_UNSET)
+ log_all_ref_updates = is_bare_repository() ? LOG_REFS_NONE : LOG_REFS_NORMAL;
- result = log_ref_setup(refname, logfile, err, flags & REF_FORCE_CREATE_REFLOG);
+ result = log_ref_setup(refs, refname,
+ flags & REF_FORCE_CREATE_REFLOG,
+ &logfd, err);
if (result)
return result;
- logfd = open(logfile->buf, oflags);
if (logfd < 0)
return 0;
- result = log_ref_write_fd(logfd, old_sha1, new_sha1,
+ result = log_ref_write_fd(logfd, old_oid, new_oid,
git_committer_info(0), msg);
if (result) {
- strbuf_addf(err, "unable to append to %s: %s", logfile->buf,
- strerror(errno));
+ struct strbuf sb = STRBUF_INIT;
+ int save_errno = errno;
+
+ files_reflog_path(refs, &sb, refname);
+ strbuf_addf(err, "unable to append to '%s': %s",
+ sb.buf, strerror(save_errno));
+ strbuf_release(&sb);
close(logfd);
return -1;
}
if (close(logfd)) {
- strbuf_addf(err, "unable to append to %s: %s", logfile->buf,
- strerror(errno));
+ struct strbuf sb = STRBUF_INIT;
+ int save_errno = errno;
+
+ files_reflog_path(refs, &sb, refname);
+ strbuf_addf(err, "unable to append to '%s': %s",
+ sb.buf, strerror(save_errno));
+ strbuf_release(&sb);
return -1;
}
return 0;
}
-static int log_ref_write(const char *refname, const unsigned char *old_sha1,
- const unsigned char *new_sha1, const char *msg,
- int flags, struct strbuf *err)
-{
- return files_log_ref_write(refname, old_sha1, new_sha1, msg, flags,
- err);
-}
-
-int files_log_ref_write(const char *refname, const unsigned char *old_sha1,
- const unsigned char *new_sha1, const char *msg,
- int flags, struct strbuf *err)
-{
- struct strbuf sb = STRBUF_INIT;
- int ret = log_ref_write_1(refname, old_sha1, new_sha1, msg, &sb, flags,
- err);
- strbuf_release(&sb);
- return ret;
-}
-
/*
* Write sha1 into the open lockfile, then close the lockfile. On
* errors, rollback the lockfile, fill in *err and
* return -1.
*/
static int write_ref_to_lockfile(struct ref_lock *lock,
- const unsigned char *sha1, struct strbuf *err)
+ const struct object_id *oid, struct strbuf *err)
{
static char term = '\n';
struct object *o;
int fd;
- o = parse_object(sha1);
+ o = parse_object(oid);
if (!o) {
strbuf_addf(err,
- "Trying to write ref %s with nonexistent object %s",
- lock->ref_name, sha1_to_hex(sha1));
+ "trying to write ref '%s' with nonexistent object %s",
+ lock->ref_name, oid_to_hex(oid));
unlock_ref(lock);
return -1;
}
if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
strbuf_addf(err,
- "Trying to write non-commit object %s to branch %s",
- sha1_to_hex(sha1), lock->ref_name);
+ "trying to write non-commit object %s to branch '%s'",
+ oid_to_hex(oid), lock->ref_name);
unlock_ref(lock);
return -1;
}
fd = get_lock_file_fd(lock->lk);
- if (write_in_full(fd, sha1_to_hex(sha1), 40) != 40 ||
+ if (write_in_full(fd, oid_to_hex(oid), GIT_SHA1_HEXSZ) != GIT_SHA1_HEXSZ ||
write_in_full(fd, &term, 1) != 1 ||
close_ref(lock) < 0) {
strbuf_addf(err,
- "Couldn't write %s", get_lock_file_path(lock->lk));
+ "couldn't write '%s'", get_lock_file_path(lock->lk));
unlock_ref(lock);
return -1;
}
* to the loose reference lockfile. Also update the reflogs if
* necessary, using the specified lockmsg (which can be NULL).
*/
-static int commit_ref_update(struct ref_lock *lock,
- const unsigned char *sha1, const char *logmsg,
- int flags, struct strbuf *err)
-{
- clear_loose_ref_cache(&ref_cache);
- if (log_ref_write(lock->ref_name, lock->old_oid.hash, sha1, logmsg, flags, err) < 0 ||
- (strcmp(lock->ref_name, lock->orig_ref_name) &&
- log_ref_write(lock->orig_ref_name, lock->old_oid.hash, sha1, logmsg, flags, err) < 0)) {
+static int commit_ref_update(struct files_ref_store *refs,
+ struct ref_lock *lock,
+ const struct object_id *oid, const char *logmsg,
+ struct strbuf *err)
+{
+ files_assert_main_repository(refs, "commit_ref_update");
+
+ clear_loose_ref_cache(refs);
+ if (files_log_ref_write(refs, lock->ref_name,
+ &lock->old_oid, oid,
+ logmsg, 0, err)) {
char *old_msg = strbuf_detach(err, NULL);
- strbuf_addf(err, "Cannot update the ref '%s': %s",
+ strbuf_addf(err, "cannot update the ref '%s': %s",
lock->ref_name, old_msg);
free(old_msg);
unlock_ref(lock);
return -1;
}
- if (strcmp(lock->orig_ref_name, "HEAD") != 0) {
+
+ if (strcmp(lock->ref_name, "HEAD") != 0) {
/*
* Special hack: If a branch is updated directly and HEAD
* points to it (may happen on the remote side of a push
* check with HEAD only which should cover 99% of all usage
* scenarios (even 100% of the default ones).
*/
- unsigned char head_sha1[20];
+ struct object_id head_oid;
int head_flag;
const char *head_ref;
- head_ref = resolve_ref_unsafe("HEAD", RESOLVE_REF_READING,
- head_sha1, &head_flag);
+
+ head_ref = refs_resolve_ref_unsafe(&refs->base, "HEAD",
+ RESOLVE_REF_READING,
+ head_oid.hash, &head_flag);
if (head_ref && (head_flag & REF_ISSYMREF) &&
!strcmp(head_ref, lock->ref_name)) {
struct strbuf log_err = STRBUF_INIT;
- if (log_ref_write("HEAD", lock->old_oid.hash, sha1,
- logmsg, 0, &log_err)) {
+ if (files_log_ref_write(refs, "HEAD",
+ &lock->old_oid, oid,
+ logmsg, 0, &log_err)) {
error("%s", log_err.buf);
strbuf_release(&log_err);
}
}
}
+
if (commit_ref(lock)) {
- error("Couldn't set %s", lock->ref_name);
+ strbuf_addf(err, "couldn't set '%s'", lock->ref_name);
unlock_ref(lock);
return -1;
}
return ret;
}
-static void update_symref_reflog(struct ref_lock *lock, const char *refname,
+static void update_symref_reflog(struct files_ref_store *refs,
+ struct ref_lock *lock, const char *refname,
const char *target, const char *logmsg)
{
struct strbuf err = STRBUF_INIT;
- unsigned char new_sha1[20];
- if (logmsg && !read_ref(target, new_sha1) &&
- log_ref_write(refname, lock->old_oid.hash, new_sha1, logmsg, 0, &err)) {
+ struct object_id new_oid;
+ if (logmsg &&
+ !refs_read_ref_full(&refs->base, target,
+ RESOLVE_REF_READING, new_oid.hash, NULL) &&
+ files_log_ref_write(refs, refname, &lock->old_oid,
+ &new_oid, logmsg, 0, &err)) {
error("%s", err.buf);
strbuf_release(&err);
}
}
-static int create_symref_locked(struct ref_lock *lock, const char *refname,
+static int create_symref_locked(struct files_ref_store *refs,
+ struct ref_lock *lock, const char *refname,
const char *target, const char *logmsg)
{
if (prefer_symlink_refs && !create_ref_symlink(lock, target)) {
- update_symref_reflog(lock, refname, target, logmsg);
+ update_symref_reflog(refs, lock, refname, target, logmsg);
return 0;
}
return error("unable to fdopen %s: %s",
lock->lk->tempfile.filename.buf, strerror(errno));
- update_symref_reflog(lock, refname, target, logmsg);
+ update_symref_reflog(refs, lock, refname, target, logmsg);
/* no error check; commit_ref will check ferror */
fprintf(lock->lk->tempfile.fp, "ref: %s\n", target);
return 0;
}
-int create_symref(const char *refname, const char *target, const char *logmsg)
+static int files_create_symref(struct ref_store *ref_store,
+ const char *refname, const char *target,
+ const char *logmsg)
{
+ struct files_ref_store *refs =
+ files_downcast(ref_store, REF_STORE_WRITE, "create_symref");
struct strbuf err = STRBUF_INIT;
struct ref_lock *lock;
int ret;
- lock = lock_ref_sha1_basic(refname, NULL, NULL, NULL, REF_NODEREF, NULL,
+ lock = lock_ref_sha1_basic(refs, refname, NULL,
+ NULL, NULL, REF_NODEREF, NULL,
&err);
if (!lock) {
error("%s", err.buf);
return -1;
}
- ret = create_symref_locked(lock, refname, target, logmsg);
+ ret = create_symref_locked(refs, lock, refname, target, logmsg);
unlock_ref(lock);
return ret;
}
-int set_worktree_head_symref(const char *gitdir, const char *target)
+static int files_reflog_exists(struct ref_store *ref_store,
+ const char *refname)
{
- static struct lock_file head_lock;
- struct ref_lock *lock;
- struct strbuf head_path = STRBUF_INIT;
- const char *head_rel;
+ struct files_ref_store *refs =
+ files_downcast(ref_store, REF_STORE_READ, "reflog_exists");
+ struct strbuf sb = STRBUF_INIT;
+ struct stat st;
int ret;
- strbuf_addf(&head_path, "%s/HEAD", absolute_path(gitdir));
- if (hold_lock_file_for_update(&head_lock, head_path.buf,
- LOCK_NO_DEREF) < 0) {
- struct strbuf err = STRBUF_INIT;
- unable_to_lock_message(head_path.buf, errno, &err);
- error("%s", err.buf);
- strbuf_release(&err);
- strbuf_release(&head_path);
- return -1;
- }
-
- /* head_rel will be "HEAD" for the main tree, "worktrees/wt/HEAD" for
- linked trees */
- head_rel = remove_leading_path(head_path.buf,
- absolute_path(get_git_common_dir()));
- /* to make use of create_symref_locked(), initialize ref_lock */
- lock = xcalloc(1, sizeof(struct ref_lock));
- lock->lk = &head_lock;
- lock->ref_name = xstrdup(head_rel);
- lock->orig_ref_name = xstrdup(head_rel);
-
- ret = create_symref_locked(lock, head_rel, target, NULL);
-
- unlock_ref(lock); /* will free lock */
- strbuf_release(&head_path);
+ files_reflog_path(refs, &sb, refname);
+ ret = !lstat(sb.buf, &st) && S_ISREG(st.st_mode);
+ strbuf_release(&sb);
return ret;
}
-int reflog_exists(const char *refname)
+static int files_delete_reflog(struct ref_store *ref_store,
+ const char *refname)
{
- struct stat st;
-
- return !lstat(git_path("logs/%s", refname), &st) &&
- S_ISREG(st.st_mode);
-}
+ struct files_ref_store *refs =
+ files_downcast(ref_store, REF_STORE_WRITE, "delete_reflog");
+ struct strbuf sb = STRBUF_INIT;
+ int ret;
-int delete_reflog(const char *refname)
-{
- return remove_path(git_path("logs/%s", refname));
+ files_reflog_path(refs, &sb, refname);
+ ret = remove_path(sb.buf);
+ strbuf_release(&sb);
+ return ret;
}
static int show_one_reflog_ent(struct strbuf *sb, each_reflog_ent_fn fn, void *cb_data)
{
- unsigned char osha1[20], nsha1[20];
+ struct object_id ooid, noid;
char *email_end, *message;
- unsigned long timestamp;
+ timestamp_t timestamp;
int tz;
+ const char *p = sb->buf;
/* old SP new SP name <email> SP time TAB msg LF */
- if (sb->len < 83 || sb->buf[sb->len - 1] != '\n' ||
- get_sha1_hex(sb->buf, osha1) || sb->buf[40] != ' ' ||
- get_sha1_hex(sb->buf + 41, nsha1) || sb->buf[81] != ' ' ||
- !(email_end = strchr(sb->buf + 82, '>')) ||
+ if (!sb->len || sb->buf[sb->len - 1] != '\n' ||
+ parse_oid_hex(p, &ooid, &p) || *p++ != ' ' ||
+ parse_oid_hex(p, &noid, &p) || *p++ != ' ' ||
+ !(email_end = strchr(p, '>')) ||
email_end[1] != ' ' ||
- !(timestamp = strtoul(email_end + 2, &message, 10)) ||
+ !(timestamp = parse_timestamp(email_end + 2, &message, 10)) ||
!message || message[0] != ' ' ||
(message[1] != '+' && message[1] != '-') ||
!isdigit(message[2]) || !isdigit(message[3]) ||
message += 6;
else
message += 7;
- return fn(osha1, nsha1, sb->buf + 82, timestamp, tz, message, cb_data);
+ return fn(&ooid, &noid, p, timestamp, tz, message, cb_data);
}
static char *find_beginning_of_line(char *bob, char *scan)
return scan;
}
-int for_each_reflog_ent_reverse(const char *refname, each_reflog_ent_fn fn, void *cb_data)
+static int files_for_each_reflog_ent_reverse(struct ref_store *ref_store,
+ const char *refname,
+ each_reflog_ent_fn fn,
+ void *cb_data)
{
+ struct files_ref_store *refs =
+ files_downcast(ref_store, REF_STORE_READ,
+ "for_each_reflog_ent_reverse");
struct strbuf sb = STRBUF_INIT;
FILE *logfp;
long pos;
int ret = 0, at_tail = 1;
- logfp = fopen(git_path("logs/%s", refname), "r");
+ files_reflog_path(refs, &sb, refname);
+ logfp = fopen(sb.buf, "r");
+ strbuf_release(&sb);
if (!logfp)
return -1;
/* Jump to the end */
if (fseek(logfp, 0, SEEK_END) < 0)
- return error("cannot seek back reflog for %s: %s",
- refname, strerror(errno));
+ ret = error("cannot seek back reflog for %s: %s",
+ refname, strerror(errno));
pos = ftell(logfp);
while (!ret && 0 < pos) {
int cnt;
/* Fill next block from the end */
cnt = (sizeof(buf) < pos) ? sizeof(buf) : pos;
- if (fseek(logfp, pos - cnt, SEEK_SET))
- return error("cannot seek back reflog for %s: %s",
- refname, strerror(errno));
+ if (fseek(logfp, pos - cnt, SEEK_SET)) {
+ ret = error("cannot seek back reflog for %s: %s",
+ refname, strerror(errno));
+ break;
+ }
nread = fread(buf, cnt, 1, logfp);
- if (nread != 1)
- return error("cannot read %d bytes from reflog for %s: %s",
- cnt, refname, strerror(errno));
+ if (nread != 1) {
+ ret = error("cannot read %d bytes from reflog for %s: %s",
+ cnt, refname, strerror(errno));
+ break;
+ }
pos -= cnt;
scanp = endp = buf + cnt;
return ret;
}
-int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, void *cb_data)
+static int files_for_each_reflog_ent(struct ref_store *ref_store,
+ const char *refname,
+ each_reflog_ent_fn fn, void *cb_data)
{
+ struct files_ref_store *refs =
+ files_downcast(ref_store, REF_STORE_READ,
+ "for_each_reflog_ent");
FILE *logfp;
struct strbuf sb = STRBUF_INIT;
int ret = 0;
- logfp = fopen(git_path("logs/%s", refname), "r");
+ files_reflog_path(refs, &sb, refname);
+ logfp = fopen(sb.buf, "r");
+ strbuf_release(&sb);
if (!logfp)
return -1;
strbuf_release(&sb);
return ret;
}
-/*
- * Call fn for each reflog in the namespace indicated by name. name
- * must be empty or end with '/'. Name will be used as a scratch
- * space, but its contents will be restored before return.
- */
-static int do_for_each_reflog(struct strbuf *name, each_ref_fn fn, void *cb_data)
-{
- DIR *d = opendir(git_path("logs/%s", name->buf));
- int retval = 0;
- struct dirent *de;
- int oldlen = name->len;
- if (!d)
- return name->len ? errno : 0;
+struct files_reflog_iterator {
+ struct ref_iterator base;
- while ((de = readdir(d)) != NULL) {
- struct stat st;
+ struct ref_store *ref_store;
+ struct dir_iterator *dir_iterator;
+ struct object_id oid;
+};
- if (de->d_name[0] == '.')
+static int files_reflog_iterator_advance(struct ref_iterator *ref_iterator)
+{
+ struct files_reflog_iterator *iter =
+ (struct files_reflog_iterator *)ref_iterator;
+ struct dir_iterator *diter = iter->dir_iterator;
+ int ok;
+
+ while ((ok = dir_iterator_advance(diter)) == ITER_OK) {
+ int flags;
+
+ if (!S_ISREG(diter->st.st_mode))
continue;
- if (ends_with(de->d_name, ".lock"))
+ if (diter->basename[0] == '.')
+ continue;
+ if (ends_with(diter->basename, ".lock"))
continue;
- strbuf_addstr(name, de->d_name);
- if (stat(git_path("logs/%s", name->buf), &st) < 0) {
- ; /* silently ignore */
- } else {
- if (S_ISDIR(st.st_mode)) {
- strbuf_addch(name, '/');
- retval = do_for_each_reflog(name, fn, cb_data);
- } else {
- struct object_id oid;
- if (read_ref_full(name->buf, 0, oid.hash, NULL))
- retval = error("bad ref for %s", name->buf);
- else
- retval = fn(name->buf, &oid, 0, cb_data);
- }
- if (retval)
- break;
+ if (refs_read_ref_full(iter->ref_store,
+ diter->relative_path, 0,
+ iter->oid.hash, &flags)) {
+ error("bad ref for %s", diter->path.buf);
+ continue;
}
- strbuf_setlen(name, oldlen);
+
+ iter->base.refname = diter->relative_path;
+ iter->base.oid = &iter->oid;
+ iter->base.flags = flags;
+ return ITER_OK;
}
- closedir(d);
- return retval;
+
+ iter->dir_iterator = NULL;
+ if (ref_iterator_abort(ref_iterator) == ITER_ERROR)
+ ok = ITER_ERROR;
+ return ok;
}
-int for_each_reflog(each_ref_fn fn, void *cb_data)
+static int files_reflog_iterator_peel(struct ref_iterator *ref_iterator,
+ struct object_id *peeled)
{
- int retval;
- struct strbuf name;
- strbuf_init(&name, PATH_MAX);
- retval = do_for_each_reflog(&name, fn, cb_data);
- strbuf_release(&name);
- return retval;
+ die("BUG: ref_iterator_peel() called for reflog_iterator");
}
-static int ref_update_reject_duplicates(struct string_list *refnames,
- struct strbuf *err)
+static int files_reflog_iterator_abort(struct ref_iterator *ref_iterator)
{
- int i, n = refnames->nr;
+ struct files_reflog_iterator *iter =
+ (struct files_reflog_iterator *)ref_iterator;
+ int ok = ITER_DONE;
- assert(err);
+ if (iter->dir_iterator)
+ ok = dir_iterator_abort(iter->dir_iterator);
+
+ base_ref_iterator_free(ref_iterator);
+ return ok;
+}
+
+static struct ref_iterator_vtable files_reflog_iterator_vtable = {
+ files_reflog_iterator_advance,
+ files_reflog_iterator_peel,
+ files_reflog_iterator_abort
+};
+
+static struct ref_iterator *files_reflog_iterator_begin(struct ref_store *ref_store)
+{
+ struct files_ref_store *refs =
+ files_downcast(ref_store, REF_STORE_READ,
+ "reflog_iterator_begin");
+ struct files_reflog_iterator *iter = xcalloc(1, sizeof(*iter));
+ struct ref_iterator *ref_iterator = &iter->base;
+ struct strbuf sb = STRBUF_INIT;
+
+ base_ref_iterator_init(ref_iterator, &files_reflog_iterator_vtable);
+ files_reflog_path(refs, &sb, NULL);
+ iter->dir_iterator = dir_iterator_begin(sb.buf);
+ iter->ref_store = ref_store;
+ strbuf_release(&sb);
+ return ref_iterator;
+}
+
+/*
+ * If update is a direct update of head_ref (the reference pointed to
+ * by HEAD), then add an extra REF_LOG_ONLY update for HEAD.
+ */
+static int split_head_update(struct ref_update *update,
+ struct ref_transaction *transaction,
+ const char *head_ref,
+ struct string_list *affected_refnames,
+ struct strbuf *err)
+{
+ struct string_list_item *item;
+ struct ref_update *new_update;
+
+ if ((update->flags & REF_LOG_ONLY) ||
+ (update->flags & REF_ISPRUNING) ||
+ (update->flags & REF_UPDATE_VIA_HEAD))
+ return 0;
+
+ if (strcmp(update->refname, head_ref))
+ return 0;
+
+ /*
+ * First make sure that HEAD is not already in the
+ * transaction. This insertion is O(N) in the transaction
+ * size, but it happens at most once per transaction.
+ */
+ item = string_list_insert(affected_refnames, "HEAD");
+ if (item->util) {
+ /* An entry already existed */
+ strbuf_addf(err,
+ "multiple updates for 'HEAD' (including one "
+ "via its referent '%s') are not allowed",
+ update->refname);
+ return TRANSACTION_NAME_CONFLICT;
+ }
+
+ new_update = ref_transaction_add_update(
+ transaction, "HEAD",
+ update->flags | REF_LOG_ONLY | REF_NODEREF,
+ update->new_oid.hash, update->old_oid.hash,
+ update->msg);
+
+ item->util = new_update;
+
+ return 0;
+}
+
+/*
+ * update is for a symref that points at referent and doesn't have
+ * REF_NODEREF set. Split it into two updates:
+ * - The original update, but with REF_LOG_ONLY and REF_NODEREF set
+ * - A new, separate update for the referent reference
+ * Note that the new update will itself be subject to splitting when
+ * the iteration gets to it.
+ */
+static int split_symref_update(struct files_ref_store *refs,
+ struct ref_update *update,
+ const char *referent,
+ struct ref_transaction *transaction,
+ struct string_list *affected_refnames,
+ struct strbuf *err)
+{
+ struct string_list_item *item;
+ struct ref_update *new_update;
+ unsigned int new_flags;
+
+ /*
+ * First make sure that referent is not already in the
+ * transaction. This insertion is O(N) in the transaction
+ * size, but it happens at most once per symref in a
+ * transaction.
+ */
+ item = string_list_insert(affected_refnames, referent);
+ if (item->util) {
+ /* An entry already existed */
+ strbuf_addf(err,
+ "multiple updates for '%s' (including one "
+ "via symref '%s') are not allowed",
+ referent, update->refname);
+ return TRANSACTION_NAME_CONFLICT;
+ }
+
+ new_flags = update->flags;
+ if (!strcmp(update->refname, "HEAD")) {
+ /*
+ * Record that the new update came via HEAD, so that
+ * when we process it, split_head_update() doesn't try
+ * to add another reflog update for HEAD. Note that
+ * this bit will be propagated if the new_update
+ * itself needs to be split.
+ */
+ new_flags |= REF_UPDATE_VIA_HEAD;
+ }
+
+ new_update = ref_transaction_add_update(
+ transaction, referent, new_flags,
+ update->new_oid.hash, update->old_oid.hash,
+ update->msg);
+
+ new_update->parent_update = update;
+
+ /*
+ * Change the symbolic ref update to log only. Also, it
+ * doesn't need to check its old SHA-1 value, as that will be
+ * done when new_update is processed.
+ */
+ update->flags |= REF_LOG_ONLY | REF_NODEREF;
+ update->flags &= ~REF_HAVE_OLD;
+
+ item->util = new_update;
+
+ return 0;
+}
+
+/*
+ * Return the refname under which update was originally requested.
+ */
+static const char *original_update_refname(struct ref_update *update)
+{
+ while (update->parent_update)
+ update = update->parent_update;
+
+ return update->refname;
+}
+
+/*
+ * Check whether the REF_HAVE_OLD and old_oid values stored in update
+ * are consistent with oid, which is the reference's current value. If
+ * everything is OK, return 0; otherwise, write an error message to
+ * err and return -1.
+ */
+static int check_old_oid(struct ref_update *update, struct object_id *oid,
+ struct strbuf *err)
+{
+ if (!(update->flags & REF_HAVE_OLD) ||
+ !oidcmp(oid, &update->old_oid))
+ return 0;
+
+ if (is_null_oid(&update->old_oid))
+ strbuf_addf(err, "cannot lock ref '%s': "
+ "reference already exists",
+ original_update_refname(update));
+ else if (is_null_oid(oid))
+ strbuf_addf(err, "cannot lock ref '%s': "
+ "reference is missing but expected %s",
+ original_update_refname(update),
+ oid_to_hex(&update->old_oid));
+ else
+ strbuf_addf(err, "cannot lock ref '%s': "
+ "is at %s but expected %s",
+ original_update_refname(update),
+ oid_to_hex(oid),
+ oid_to_hex(&update->old_oid));
+
+ return -1;
+}
+
+/*
+ * Prepare for carrying out update:
+ * - Lock the reference referred to by update.
+ * - Read the reference under lock.
+ * - Check that its old SHA-1 value (if specified) is correct, and in
+ * any case record it in update->lock->old_oid for later use when
+ * writing the reflog.
+ * - If it is a symref update without REF_NODEREF, split it up into a
+ * REF_LOG_ONLY update of the symref and add a separate update for
+ * the referent to transaction.
+ * - If it is an update of head_ref, add a corresponding REF_LOG_ONLY
+ * update of HEAD.
+ */
+static int lock_ref_for_update(struct files_ref_store *refs,
+ struct ref_update *update,
+ struct ref_transaction *transaction,
+ const char *head_ref,
+ struct string_list *affected_refnames,
+ struct strbuf *err)
+{
+ struct strbuf referent = STRBUF_INIT;
+ int mustexist = (update->flags & REF_HAVE_OLD) &&
+ !is_null_oid(&update->old_oid);
+ int ret;
+ struct ref_lock *lock;
+
+ files_assert_main_repository(refs, "lock_ref_for_update");
+
+ if ((update->flags & REF_HAVE_NEW) && is_null_oid(&update->new_oid))
+ update->flags |= REF_DELETING;
+
+ if (head_ref) {
+ ret = split_head_update(update, transaction, head_ref,
+ affected_refnames, err);
+ if (ret)
+ return ret;
+ }
+
+ ret = lock_raw_ref(refs, update->refname, mustexist,
+ affected_refnames, NULL,
+ &lock, &referent,
+ &update->type, err);
+ if (ret) {
+ char *reason;
+
+ reason = strbuf_detach(err, NULL);
+ strbuf_addf(err, "cannot lock ref '%s': %s",
+ original_update_refname(update), reason);
+ free(reason);
+ return ret;
+ }
+
+ update->backend_data = lock;
+
+ if (update->type & REF_ISSYMREF) {
+ if (update->flags & REF_NODEREF) {
+ /*
+ * We won't be reading the referent as part of
+ * the transaction, so we have to read it here
+ * to record and possibly check old_sha1:
+ */
+ if (refs_read_ref_full(&refs->base,
+ referent.buf, 0,
+ lock->old_oid.hash, NULL)) {
+ if (update->flags & REF_HAVE_OLD) {
+ strbuf_addf(err, "cannot lock ref '%s': "
+ "error reading reference",
+ original_update_refname(update));
+ return -1;
+ }
+ } else if (check_old_oid(update, &lock->old_oid, err)) {
+ return TRANSACTION_GENERIC_ERROR;
+ }
+ } else {
+ /*
+ * Create a new update for the reference this
+ * symref is pointing at. Also, we will record
+ * and verify old_sha1 for this update as part
+ * of processing the split-off update, so we
+ * don't have to do it here.
+ */
+ ret = split_symref_update(refs, update,
+ referent.buf, transaction,
+ affected_refnames, err);
+ if (ret)
+ return ret;
+ }
+ } else {
+ struct ref_update *parent_update;
+
+ if (check_old_oid(update, &lock->old_oid, err))
+ return TRANSACTION_GENERIC_ERROR;
+
+ /*
+ * If this update is happening indirectly because of a
+ * symref update, record the old SHA-1 in the parent
+ * update:
+ */
+ for (parent_update = update->parent_update;
+ parent_update;
+ parent_update = parent_update->parent_update) {
+ struct ref_lock *parent_lock = parent_update->backend_data;
+ oidcpy(&parent_lock->old_oid, &lock->old_oid);
+ }
+ }
- for (i = 1; i < n; i++)
- if (!strcmp(refnames->items[i - 1].string, refnames->items[i].string)) {
+ if ((update->flags & REF_HAVE_NEW) &&
+ !(update->flags & REF_DELETING) &&
+ !(update->flags & REF_LOG_ONLY)) {
+ if (!(update->type & REF_ISSYMREF) &&
+ !oidcmp(&lock->old_oid, &update->new_oid)) {
+ /*
+ * The reference already has the desired
+ * value, so we don't need to write it.
+ */
+ } else if (write_ref_to_lockfile(lock, &update->new_oid,
+ err)) {
+ char *write_err = strbuf_detach(err, NULL);
+
+ /*
+ * The lock was freed upon failure of
+ * write_ref_to_lockfile():
+ */
+ update->backend_data = NULL;
strbuf_addf(err,
- "Multiple updates for ref '%s' not allowed.",
- refnames->items[i].string);
- return 1;
+ "cannot update ref '%s': %s",
+ update->refname, write_err);
+ free(write_err);
+ return TRANSACTION_GENERIC_ERROR;
+ } else {
+ update->flags |= REF_NEEDS_COMMIT;
+ }
+ }
+ if (!(update->flags & REF_NEEDS_COMMIT)) {
+ /*
+ * We didn't call write_ref_to_lockfile(), so
+ * the lockfile is still open. Close it to
+ * free up the file descriptor:
+ */
+ if (close_ref(lock)) {
+ strbuf_addf(err, "couldn't close '%s.lock'",
+ update->refname);
+ return TRANSACTION_GENERIC_ERROR;
}
+ }
return 0;
}
-int ref_transaction_commit(struct ref_transaction *transaction,
- struct strbuf *err)
+/*
+ * Unlock any references in `transaction` that are still locked, and
+ * mark the transaction closed.
+ */
+static void files_transaction_cleanup(struct ref_transaction *transaction)
{
- int ret = 0, i;
- int n = transaction->nr;
- struct ref_update **updates = transaction->updates;
- struct string_list refs_to_delete = STRING_LIST_INIT_NODUP;
- struct string_list_item *ref_to_delete;
+ size_t i;
+
+ for (i = 0; i < transaction->nr; i++) {
+ struct ref_update *update = transaction->updates[i];
+ struct ref_lock *lock = update->backend_data;
+
+ if (lock) {
+ unlock_ref(lock);
+ update->backend_data = NULL;
+ }
+ }
+
+ transaction->state = REF_TRANSACTION_CLOSED;
+}
+
+static int files_transaction_prepare(struct ref_store *ref_store,
+ struct ref_transaction *transaction,
+ struct strbuf *err)
+{
+ struct files_ref_store *refs =
+ files_downcast(ref_store, REF_STORE_WRITE,
+ "ref_transaction_prepare");
+ size_t i;
+ int ret = 0;
struct string_list affected_refnames = STRING_LIST_INIT_NODUP;
+ char *head_ref = NULL;
+ int head_type;
+ struct object_id head_oid;
assert(err);
- if (transaction->state != REF_TRANSACTION_OPEN)
- die("BUG: commit called for transaction that is not open");
+ if (!transaction->nr)
+ goto cleanup;
- if (!n) {
- transaction->state = REF_TRANSACTION_CLOSED;
- return 0;
- }
+ /*
+ * Fail if a refname appears more than once in the
+ * transaction. (If we end up splitting up any updates using
+ * split_symref_update() or split_head_update(), those
+ * functions will check that the new updates don't have the
+ * same refname as any existing ones.)
+ */
+ for (i = 0; i < transaction->nr; i++) {
+ struct ref_update *update = transaction->updates[i];
+ struct string_list_item *item =
+ string_list_append(&affected_refnames, update->refname);
- /* Fail if a refname appears more than once in the transaction: */
- for (i = 0; i < n; i++)
- string_list_append(&affected_refnames, updates[i]->refname);
+ /*
+ * We store a pointer to update in item->util, but at
+ * the moment we never use the value of this field
+ * except to check whether it is non-NULL.
+ */
+ item->util = update;
+ }
string_list_sort(&affected_refnames);
if (ref_update_reject_duplicates(&affected_refnames, err)) {
ret = TRANSACTION_GENERIC_ERROR;
goto cleanup;
}
+ /*
+ * Special hack: If a branch is updated directly and HEAD
+ * points to it (may happen on the remote side of a push
+ * for example) then logically the HEAD reflog should be
+ * updated too.
+ *
+ * A generic solution would require reverse symref lookups,
+ * but finding all symrefs pointing to a given branch would be
+ * rather costly for this rare event (the direct update of a
+ * branch) to be worth it. So let's cheat and check with HEAD
+ * only, which should cover 99% of all usage scenarios (even
+ * 100% of the default ones).
+ *
+ * So if HEAD is a symbolic reference, then record the name of
+ * the reference that it points to. If we see an update of
+ * head_ref within the transaction, then split_head_update()
+ * arranges for the reflog of HEAD to be updated, too.
+ */
+ head_ref = refs_resolve_refdup(ref_store, "HEAD",
+ RESOLVE_REF_NO_RECURSE,
+ head_oid.hash, &head_type);
+
+ if (head_ref && !(head_type & REF_ISSYMREF)) {
+ FREE_AND_NULL(head_ref);
+ }
+
/*
* Acquire all locks, verify old values if provided, check
* that new values are valid, and write new values to the
* lockfiles, ready to be activated. Only keep one lockfile
* open at a time to avoid running out of file descriptors.
+ * Note that lock_ref_for_update() might append more updates
+ * to the transaction.
*/
- for (i = 0; i < n; i++) {
- struct ref_update *update = updates[i];
+ for (i = 0; i < transaction->nr; i++) {
+ struct ref_update *update = transaction->updates[i];
- if ((update->flags & REF_HAVE_NEW) &&
- is_null_sha1(update->new_sha1))
- update->flags |= REF_DELETING;
- update->lock = lock_ref_sha1_basic(
- update->refname,
- ((update->flags & REF_HAVE_OLD) ?
- update->old_sha1 : NULL),
- &affected_refnames, NULL,
- update->flags,
- &update->type,
- err);
- if (!update->lock) {
- char *reason;
-
- ret = (errno == ENOTDIR)
- ? TRANSACTION_NAME_CONFLICT
- : TRANSACTION_GENERIC_ERROR;
- reason = strbuf_detach(err, NULL);
- strbuf_addf(err, "cannot lock ref '%s': %s",
- update->refname, reason);
- free(reason);
- goto cleanup;
- }
- if ((update->flags & REF_HAVE_NEW) &&
- !(update->flags & REF_DELETING)) {
- int overwriting_symref = ((update->type & REF_ISSYMREF) &&
- (update->flags & REF_NODEREF));
+ ret = lock_ref_for_update(refs, update, transaction,
+ head_ref, &affected_refnames, err);
+ if (ret)
+ break;
+ }
- if (!overwriting_symref &&
- !hashcmp(update->lock->old_oid.hash, update->new_sha1)) {
- /*
- * The reference already has the desired
- * value, so we don't need to write it.
- */
- } else if (write_ref_to_lockfile(update->lock,
- update->new_sha1,
- err)) {
- char *write_err = strbuf_detach(err, NULL);
+cleanup:
+ free(head_ref);
+ string_list_clear(&affected_refnames, 0);
- /*
- * The lock was freed upon failure of
- * write_ref_to_lockfile():
- */
- update->lock = NULL;
- strbuf_addf(err,
- "cannot update the ref '%s': %s",
- update->refname, write_err);
- free(write_err);
+ if (ret)
+ files_transaction_cleanup(transaction);
+ else
+ transaction->state = REF_TRANSACTION_PREPARED;
+
+ return ret;
+}
+
+static int files_transaction_finish(struct ref_store *ref_store,
+ struct ref_transaction *transaction,
+ struct strbuf *err)
+{
+ struct files_ref_store *refs =
+ files_downcast(ref_store, 0, "ref_transaction_finish");
+ size_t i;
+ int ret = 0;
+ struct string_list refs_to_delete = STRING_LIST_INIT_NODUP;
+ struct string_list_item *ref_to_delete;
+ struct strbuf sb = STRBUF_INIT;
+
+ assert(err);
+
+ if (!transaction->nr) {
+ transaction->state = REF_TRANSACTION_CLOSED;
+ return 0;
+ }
+
+ /* Perform updates first so live commits remain referenced */
+ for (i = 0; i < transaction->nr; i++) {
+ struct ref_update *update = transaction->updates[i];
+ struct ref_lock *lock = update->backend_data;
+
+ if (update->flags & REF_NEEDS_COMMIT ||
+ update->flags & REF_LOG_ONLY) {
+ if (files_log_ref_write(refs,
+ lock->ref_name,
+ &lock->old_oid,
+ &update->new_oid,
+ update->msg, update->flags,
+ err)) {
+ char *old_msg = strbuf_detach(err, NULL);
+
+ strbuf_addf(err, "cannot update the ref '%s': %s",
+ lock->ref_name, old_msg);
+ free(old_msg);
+ unlock_ref(lock);
+ update->backend_data = NULL;
ret = TRANSACTION_GENERIC_ERROR;
goto cleanup;
- } else {
- update->flags |= REF_NEEDS_COMMIT;
- }
- }
- if (!(update->flags & REF_NEEDS_COMMIT)) {
- /*
- * We didn't have to write anything to the lockfile.
- * Close it to free up the file descriptor:
- */
- if (close_ref(update->lock)) {
- strbuf_addf(err, "Couldn't close %s.lock",
- update->refname);
- goto cleanup;
}
}
- }
-
- /* Perform updates first so live commits remain referenced */
- for (i = 0; i < n; i++) {
- struct ref_update *update = updates[i];
-
if (update->flags & REF_NEEDS_COMMIT) {
- if (commit_ref_update(update->lock,
- update->new_sha1, update->msg,
- update->flags, err)) {
- /* freed by commit_ref_update(): */
- update->lock = NULL;
+ clear_loose_ref_cache(refs);
+ if (commit_ref(lock)) {
+ strbuf_addf(err, "couldn't set '%s'", lock->ref_name);
+ unlock_ref(lock);
+ update->backend_data = NULL;
ret = TRANSACTION_GENERIC_ERROR;
goto cleanup;
- } else {
- /* freed by commit_ref_update(): */
- update->lock = NULL;
}
}
}
-
/* Perform deletes now that updates are safely completed */
- for (i = 0; i < n; i++) {
- struct ref_update *update = updates[i];
-
- if (update->flags & REF_DELETING) {
- if (delete_ref_loose(update->lock, update->type, err)) {
- ret = TRANSACTION_GENERIC_ERROR;
- goto cleanup;
+ for (i = 0; i < transaction->nr; i++) {
+ struct ref_update *update = transaction->updates[i];
+ struct ref_lock *lock = update->backend_data;
+
+ if (update->flags & REF_DELETING &&
+ !(update->flags & REF_LOG_ONLY)) {
+ if (!(update->type & REF_ISPACKED) ||
+ update->type & REF_ISSYMREF) {
+ /* It is a loose reference. */
+ strbuf_reset(&sb);
+ files_ref_path(refs, &sb, lock->ref_name);
+ if (unlink_or_msg(sb.buf, err)) {
+ ret = TRANSACTION_GENERIC_ERROR;
+ goto cleanup;
+ }
+ update->flags |= REF_DELETED_LOOSE;
}
if (!(update->flags & REF_ISPRUNING))
string_list_append(&refs_to_delete,
- update->lock->ref_name);
+ lock->ref_name);
}
}
- if (repack_without_refs(&refs_to_delete, err)) {
+ if (packed_refs_lock(refs->packed_ref_store, 0, err)) {
ret = TRANSACTION_GENERIC_ERROR;
goto cleanup;
}
- for_each_string_list_item(ref_to_delete, &refs_to_delete)
- unlink_or_warn(git_path("logs/%s", ref_to_delete->string));
- clear_loose_ref_cache(&ref_cache);
+
+ if (repack_without_refs(refs->packed_ref_store, &refs_to_delete, err)) {
+ ret = TRANSACTION_GENERIC_ERROR;
+ packed_refs_unlock(refs->packed_ref_store);
+ goto cleanup;
+ }
+
+ packed_refs_unlock(refs->packed_ref_store);
+
+ /* Delete the reflogs of any references that were deleted: */
+ for_each_string_list_item(ref_to_delete, &refs_to_delete) {
+ strbuf_reset(&sb);
+ files_reflog_path(refs, &sb, ref_to_delete->string);
+ if (!unlink_or_warn(sb.buf))
+ try_remove_empty_parents(refs, ref_to_delete->string,
+ REMOVE_EMPTY_PARENTS_REFLOG);
+ }
+
+ clear_loose_ref_cache(refs);
cleanup:
- transaction->state = REF_TRANSACTION_CLOSED;
+ files_transaction_cleanup(transaction);
+
+ for (i = 0; i < transaction->nr; i++) {
+ struct ref_update *update = transaction->updates[i];
+
+ if (update->flags & REF_DELETED_LOOSE) {
+ /*
+ * The loose reference was deleted. Delete any
+ * empty parent directories. (Note that this
+ * can only work because we have already
+ * removed the lockfile.)
+ */
+ try_remove_empty_parents(refs, update->refname,
+ REMOVE_EMPTY_PARENTS_REF);
+ }
+ }
- for (i = 0; i < n; i++)
- if (updates[i]->lock)
- unlock_ref(updates[i]->lock);
+ strbuf_release(&sb);
string_list_clear(&refs_to_delete, 0);
- string_list_clear(&affected_refnames, 0);
return ret;
}
+static int files_transaction_abort(struct ref_store *ref_store,
+ struct ref_transaction *transaction,
+ struct strbuf *err)
+{
+ files_transaction_cleanup(transaction);
+ return 0;
+}
+
static int ref_present(const char *refname,
const struct object_id *oid, int flags, void *cb_data)
{
return string_list_has_string(affected_refnames, refname);
}
-int initial_ref_transaction_commit(struct ref_transaction *transaction,
- struct strbuf *err)
+static int files_initial_transaction_commit(struct ref_store *ref_store,
+ struct ref_transaction *transaction,
+ struct strbuf *err)
{
- int ret = 0, i;
- int n = transaction->nr;
- struct ref_update **updates = transaction->updates;
+ struct files_ref_store *refs =
+ files_downcast(ref_store, REF_STORE_WRITE,
+ "initial_ref_transaction_commit");
+ size_t i;
+ int ret = 0;
struct string_list affected_refnames = STRING_LIST_INIT_NODUP;
assert(err);
die("BUG: commit called for transaction that is not open");
/* Fail if a refname appears more than once in the transaction: */
- for (i = 0; i < n; i++)
- string_list_append(&affected_refnames, updates[i]->refname);
+ for (i = 0; i < transaction->nr; i++)
+ string_list_append(&affected_refnames,
+ transaction->updates[i]->refname);
string_list_sort(&affected_refnames);
if (ref_update_reject_duplicates(&affected_refnames, err)) {
ret = TRANSACTION_GENERIC_ERROR;
* so here we really only check that none of the references
* that we are creating already exists.
*/
- if (for_each_rawref(ref_present, &affected_refnames))
+ if (refs_for_each_rawref(&refs->base, ref_present,
+ &affected_refnames))
die("BUG: initial ref transaction called with existing refs");
- for (i = 0; i < n; i++) {
- struct ref_update *update = updates[i];
+ for (i = 0; i < transaction->nr; i++) {
+ struct ref_update *update = transaction->updates[i];
if ((update->flags & REF_HAVE_OLD) &&
- !is_null_sha1(update->old_sha1))
+ !is_null_oid(&update->old_oid))
die("BUG: initial ref transaction with old_sha1 set");
- if (verify_refname_available(update->refname,
- &affected_refnames, NULL,
- err)) {
+ if (refs_verify_refname_available(&refs->base, update->refname,
+ &affected_refnames, NULL,
+ err)) {
ret = TRANSACTION_NAME_CONFLICT;
goto cleanup;
}
}
- if (lock_packed_refs(0)) {
- strbuf_addf(err, "unable to lock packed-refs file: %s",
- strerror(errno));
+ if (packed_refs_lock(refs->packed_ref_store, 0, err)) {
ret = TRANSACTION_GENERIC_ERROR;
goto cleanup;
}
- for (i = 0; i < n; i++) {
- struct ref_update *update = updates[i];
+ for (i = 0; i < transaction->nr; i++) {
+ struct ref_update *update = transaction->updates[i];
if ((update->flags & REF_HAVE_NEW) &&
- !is_null_sha1(update->new_sha1))
- add_packed_ref(update->refname, update->new_sha1);
+ !is_null_oid(&update->new_oid))
+ add_packed_ref(refs->packed_ref_store, update->refname,
+ &update->new_oid);
}
- if (commit_packed_refs()) {
- strbuf_addf(err, "unable to commit packed-refs file: %s",
- strerror(errno));
+ if (commit_packed_refs(refs->packed_ref_store, err)) {
ret = TRANSACTION_GENERIC_ERROR;
goto cleanup;
}
cleanup:
+ packed_refs_unlock(refs->packed_ref_store);
transaction->state = REF_TRANSACTION_CLOSED;
string_list_clear(&affected_refnames, 0);
return ret;
reflog_expiry_should_prune_fn *should_prune_fn;
void *policy_cb;
FILE *newlog;
- unsigned char last_kept_sha1[20];
+ struct object_id last_kept_oid;
};
-static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
- const char *email, unsigned long timestamp, int tz,
+static int expire_reflog_ent(struct object_id *ooid, struct object_id *noid,
+ const char *email, timestamp_t timestamp, int tz,
const char *message, void *cb_data)
{
struct expire_reflog_cb *cb = cb_data;
struct expire_reflog_policy_cb *policy_cb = cb->policy_cb;
if (cb->flags & EXPIRE_REFLOGS_REWRITE)
- osha1 = cb->last_kept_sha1;
+ ooid = &cb->last_kept_oid;
- if ((*cb->should_prune_fn)(osha1, nsha1, email, timestamp, tz,
+ if ((*cb->should_prune_fn)(ooid, noid, email, timestamp, tz,
message, policy_cb)) {
if (!cb->newlog)
printf("would prune %s", message);
printf("prune %s", message);
} else {
if (cb->newlog) {
- fprintf(cb->newlog, "%s %s %s %lu %+05d\t%s",
- sha1_to_hex(osha1), sha1_to_hex(nsha1),
+ fprintf(cb->newlog, "%s %s %s %"PRItime" %+05d\t%s",
+ oid_to_hex(ooid), oid_to_hex(noid),
email, timestamp, tz, message);
- hashcpy(cb->last_kept_sha1, nsha1);
+ oidcpy(&cb->last_kept_oid, noid);
}
if (cb->flags & EXPIRE_REFLOGS_VERBOSE)
printf("keep %s", message);
return 0;
}
-int reflog_expire(const char *refname, const unsigned char *sha1,
- unsigned int flags,
- reflog_expiry_prepare_fn prepare_fn,
- reflog_expiry_should_prune_fn should_prune_fn,
- reflog_expiry_cleanup_fn cleanup_fn,
- void *policy_cb_data)
+static int files_reflog_expire(struct ref_store *ref_store,
+ const char *refname, const unsigned char *sha1,
+ unsigned int flags,
+ reflog_expiry_prepare_fn prepare_fn,
+ reflog_expiry_should_prune_fn should_prune_fn,
+ reflog_expiry_cleanup_fn cleanup_fn,
+ void *policy_cb_data)
{
+ struct files_ref_store *refs =
+ files_downcast(ref_store, REF_STORE_WRITE, "reflog_expire");
static struct lock_file reflog_lock;
struct expire_reflog_cb cb;
struct ref_lock *lock;
+ struct strbuf log_file_sb = STRBUF_INIT;
char *log_file;
int status = 0;
int type;
struct strbuf err = STRBUF_INIT;
+ struct object_id oid;
memset(&cb, 0, sizeof(cb));
cb.flags = flags;
* reference itself, plus we might need to update the
* reference if --updateref was specified:
*/
- lock = lock_ref_sha1_basic(refname, sha1, NULL, NULL, 0, &type, &err);
+ lock = lock_ref_sha1_basic(refs, refname, sha1,
+ NULL, NULL, REF_NODEREF,
+ &type, &err);
if (!lock) {
error("cannot lock ref '%s': %s", refname, err.buf);
strbuf_release(&err);
return -1;
}
- if (!reflog_exists(refname)) {
+ if (!refs_reflog_exists(ref_store, refname)) {
unlock_ref(lock);
return 0;
}
- log_file = git_pathdup("logs/%s", refname);
+ files_reflog_path(refs, &log_file_sb, refname);
+ log_file = strbuf_detach(&log_file_sb, NULL);
if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) {
/*
* Even though holding $GIT_DIR/logs/$reflog.lock has
}
}
- (*prepare_fn)(refname, sha1, cb.policy_cb);
- for_each_reflog_ent(refname, expire_reflog_ent, &cb);
+ hashcpy(oid.hash, sha1);
+
+ (*prepare_fn)(refname, &oid, cb.policy_cb);
+ refs_for_each_reflog_ent(ref_store, refname, expire_reflog_ent, &cb);
(*cleanup_fn)(cb.policy_cb);
if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) {
*/
int update = (flags & EXPIRE_REFLOGS_UPDATE_REF) &&
!(type & REF_ISSYMREF) &&
- !is_null_sha1(cb.last_kept_sha1);
+ !is_null_oid(&cb.last_kept_oid);
if (close_lock_file(&reflog_lock)) {
status |= error("couldn't write %s: %s", log_file,
strerror(errno));
} else if (update &&
(write_in_full(get_lock_file_fd(lock->lk),
- sha1_to_hex(cb.last_kept_sha1), 40) != 40 ||
+ oid_to_hex(&cb.last_kept_oid), GIT_SHA1_HEXSZ) != GIT_SHA1_HEXSZ ||
write_str_in_full(get_lock_file_fd(lock->lk), "\n") != 1 ||
close_ref(lock) < 0)) {
status |= error("couldn't write %s",
unlock_ref(lock);
return -1;
}
+
+static int files_init_db(struct ref_store *ref_store, struct strbuf *err)
+{
+ struct files_ref_store *refs =
+ files_downcast(ref_store, REF_STORE_WRITE, "init_db");
+ struct strbuf sb = STRBUF_INIT;
+
+ /*
+ * Create .git/refs/{heads,tags}
+ */
+ files_ref_path(refs, &sb, "refs/heads");
+ safe_create_dir(sb.buf, 1);
+
+ strbuf_reset(&sb);
+ files_ref_path(refs, &sb, "refs/tags");
+ safe_create_dir(sb.buf, 1);
+
+ strbuf_release(&sb);
+ return 0;
+}
+
+struct ref_storage_be refs_be_files = {
+ NULL,
+ "files",
+ files_ref_store_create,
+ files_init_db,
+ files_transaction_prepare,
+ files_transaction_finish,
+ files_transaction_abort,
+ files_initial_transaction_commit,
+
+ files_pack_refs,
+ files_peel_ref,
+ files_create_symref,
+ files_delete_refs,
+ files_rename_ref,
+
+ files_ref_iterator_begin,
+ files_read_raw_ref,
+
+ files_reflog_iterator_begin,
+ files_for_each_reflog_ent,
+ files_for_each_reflog_ent_reverse,
+ files_reflog_exists,
+ files_create_reflog,
+ files_delete_reflog,
+ files_reflog_expire
+};