+/*
+ * The backend-independent part of the reference module.
+ */
+
#include "cache.h"
#include "lockfile.h"
#include "refs.h"
+#include "refs/refs-internal.h"
#include "object.h"
#include "tag.h"
-#include "dir.h"
-#include "string-list.h"
-
-struct ref_lock {
- char *ref_name;
- char *orig_ref_name;
- struct lock_file *lk;
- struct object_id old_oid;
-};
/*
* How to handle various characters in refnames:
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 4, 4
};
-/*
- * Flag passed to lock_ref_sha1_basic() telling it to tolerate broken
- * refs (i.e., because the reference is about to be deleted anyway).
- */
-#define REF_DELETING 0x02
-
-/*
- * Used as a flag in ref_update::flags when a loose ref is being
- * pruned.
- */
-#define REF_ISPRUNING 0x04
-
-/*
- * Used as a flag in ref_update::flags when the reference should be
- * updated to new_sha1.
- */
-#define REF_HAVE_NEW 0x08
-
-/*
- * Used as a flag in ref_update::flags when old_sha1 should be
- * checked.
- */
-#define REF_HAVE_OLD 0x10
-
-/*
- * Used as a flag in ref_update::flags when the lockfile needs to be
- * committed.
- */
-#define REF_NEEDS_COMMIT 0x20
-
-/*
- * 0x40 is REF_FORCE_CREATE_REFLOG, so skip it if you're adding a
- * value to ref_update::flags
- */
-
/*
* Try to read one refname component from the front of refname.
* Return the length of the component found, or -1 if the component is
return 0;
}
-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;
-}
-
-/*
- * Check if a refname is safe.
- * For refs that start with "refs/" we consider it safe as long they do
- * not try to resolve to outside of refs/.
- *
- * For all other refs we only consider them safe iff they only contain
- * upper case characters and '_' (like "HEAD" AND "MERGE_HEAD", and not like
- * "config").
- */
-static int refname_is_safe(const char *refname)
+int refname_is_safe(const char *refname)
{
if (starts_with(refname, "refs/")) {
char *buf;
return 1;
}
-static struct ref_entry *create_ref_entry(const char *refname,
- const unsigned char *sha1, int flag,
- int check_name)
+char *resolve_refdup(const char *refname, int resolve_flags,
+ unsigned char *sha1, int *flags)
{
- int len;
- struct ref_entry *ref;
-
- if (check_name &&
- check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
- die("Reference has invalid format: '%s'", refname);
- len = strlen(refname) + 1;
- ref = xmalloc(sizeof(struct ref_entry) + len);
- hashcpy(ref->u.value.oid.hash, sha1);
- oidclr(&ref->u.value.peeled);
- memcpy(ref->name, refname, len);
- ref->flag = flag;
- return ref;
+ return xstrdup_or_null(resolve_ref_unsafe(refname, resolve_flags,
+ sha1, flags));
}
-static void clear_ref_dir(struct ref_dir *dir);
+/* The argument to filter_refs */
+struct ref_filter {
+ const char *pattern;
+ each_ref_fn *fn;
+ void *cb_data;
+};
-static void free_ref_entry(struct ref_entry *entry)
+int read_ref_full(const char *refname, int resolve_flags, unsigned char *sha1, int *flags)
{
- 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);
+ if (resolve_ref_unsafe(refname, resolve_flags, sha1, flags))
+ return 0;
+ return -1;
}
-/*
- * 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)
+int read_ref(const char *refname, unsigned char *sha1)
{
- 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;
+ return read_ref_full(refname, RESOLVE_REF_READING, sha1, NULL);
}
-/*
- * Clear and free all entries in dir, recursively.
- */
-static void clear_ref_dir(struct ref_dir *dir)
+int ref_exists(const char *refname)
{
- 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;
+ unsigned char sha1[20];
+ return !!resolve_ref_unsafe(refname, RESOLVE_REF_READING, sha1, 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.
- */
-static struct ref_entry *create_dir_entry(struct ref_cache *ref_cache,
- const char *dirname, size_t len,
- int incomplete)
+static int filter_refs(const char *refname, const struct object_id *oid,
+ int flags, void *data)
{
- struct ref_entry *direntry;
- direntry = xcalloc(1, sizeof(struct ref_entry) + len + 1);
- memcpy(direntry->name, dirname, len);
- direntry->name[len] = '\0';
- direntry->u.subdir.ref_cache = ref_cache;
- direntry->flag = REF_DIR | (incomplete ? REF_INCOMPLETE : 0);
- return direntry;
+ struct ref_filter *filter = (struct ref_filter *)data;
+
+ if (wildmatch(filter->pattern, refname, 0, NULL))
+ return 0;
+ return filter->fn(refname, oid, flags, filter->cb_data);
}
-static int ref_entry_cmp(const void *a, const void *b)
+enum peel_status peel_object(const unsigned char *name, unsigned char *sha1)
{
- struct ref_entry *one = *(struct ref_entry **)a;
- struct ref_entry *two = *(struct ref_entry **)b;
- return strcmp(one->name, two->name);
-}
+ struct object *o = lookup_unknown_object(name);
-static void sort_ref_dir(struct ref_dir *dir);
+ if (o->type == OBJ_NONE) {
+ int type = sha1_object_info(name, NULL);
+ if (type < 0 || !object_as_type(o, type, 0))
+ return PEEL_INVALID;
+ }
-struct string_slice {
- size_t len;
- const char *str;
-};
+ if (o->type != OBJ_TAG)
+ return PEEL_NON_TAG;
-static int ref_entry_cmp_sslice(const void *key_, const void *ent_)
-{
- 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];
+ o = deref_tag_noverify(o);
+ if (!o)
+ return PEEL_INVALID;
+
- hashcpy(sha1, o->sha1);
++ hashcpy(sha1, o->oid.hash);
+ return PEEL_PEELED;
}
-/*
- * 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;
+struct warn_if_dangling_data {
+ FILE *fp;
+ const char *refname;
+ const struct string_list *refnames;
+ const char *msg_fmt;
+};
- if (refname == NULL || !dir->nr)
- return -1;
+static int warn_if_dangling_symref(const char *refname, const struct object_id *oid,
+ int flags, void *cb_data)
+{
+ struct warn_if_dangling_data *d = cb_data;
+ const char *resolves_to;
+ struct object_id junk;
- 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 (!(flags & REF_ISSYMREF))
+ return 0;
- if (r == NULL)
- return -1;
+ resolves_to = resolve_ref_unsafe(refname, 0, junk.hash, NULL);
+ if (!resolves_to
+ || (d->refname
+ ? strcmp(resolves_to, d->refname)
+ : !string_list_has_string(d->refnames, resolves_to))) {
+ return 0;
+ }
- return r - dir->entries;
+ fprintf(d->fp, d->msg_fmt, refname);
+ fputc('\n', d->fp);
+ return 0;
}
-/*
- * 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)
+void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname)
{
- 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);
+ struct warn_if_dangling_data data;
+
+ data.fp = fp;
+ data.refname = refname;
+ data.refnames = NULL;
+ data.msg_fmt = msg_fmt;
+ for_each_rawref(warn_if_dangling_symref, &data);
}
-/*
- * 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)
+void warn_dangling_symrefs(FILE *fp, const char *msg_fmt, const struct string_list *refnames)
{
- 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;
- }
+ struct warn_if_dangling_data data;
- return dir;
+ data.fp = fp;
+ data.refname = NULL;
+ data.refnames = refnames;
+ data.msg_fmt = msg_fmt;
+ for_each_rawref(warn_if_dangling_symref, &data);
}
-/*
- * 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 for_each_tag_ref(each_ref_fn fn, void *cb_data)
{
- 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;
+ return for_each_ref_in("refs/tags/", fn, cb_data);
}
-/*
- * 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 for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
{
- 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 (!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;
+ return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data);
}
-/*
- * 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)
+int for_each_branch_ref(each_ref_fn fn, void *cb_data)
{
- dir = find_containing_dir(dir, ref->name, 1);
- if (!dir)
- return -1;
- add_entry_to_dir(dir, ref);
- return 0;
+ return for_each_ref_in("refs/heads/", fn, cb_data);
}
-/*
- * 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.
- */
-static int is_dup_ref(const struct ref_entry *ref1, const struct ref_entry *ref2)
+int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
{
- if (strcmp(ref1->name, ref2->name))
- return 0;
-
- /* Duplicate name; make sure that they don't conflict: */
-
- if ((ref1->flag & REF_DIR) || (ref2->flag & REF_DIR))
- /* This is impossible by construction */
- die("Reference directory conflict: %s", ref1->name);
-
- if (oidcmp(&ref1->u.value.oid, &ref2->u.value.oid))
- die("Duplicated ref, and SHA1s don't match: %s", ref1->name);
+ return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data);
+}
- warning("Duplicated ref: %s", ref1->name);
- return 1;
+int for_each_remote_ref(each_ref_fn fn, void *cb_data)
+{
+ return for_each_ref_in("refs/remotes/", fn, cb_data);
}
-/*
- * Sort the entries in dir non-recursively (if they are not already
- * sorted) and remove any duplicate entries.
- */
-static void sort_ref_dir(struct ref_dir *dir)
+int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
{
- int i, j;
- struct ref_entry *last = NULL;
+ return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data);
+}
- /*
- * This check also prevents passing a zero-length array to qsort(),
- * which is a problem on some platforms.
- */
- if (dir->sorted == dir->nr)
- return;
+int head_ref_namespaced(each_ref_fn fn, void *cb_data)
+{
+ struct strbuf buf = STRBUF_INIT;
+ int ret = 0;
+ struct object_id oid;
+ int flag;
- qsort(dir->entries, dir->nr, sizeof(*dir->entries), ref_entry_cmp);
+ strbuf_addf(&buf, "%sHEAD", get_git_namespace());
+ if (!read_ref_full(buf.buf, RESOLVE_REF_READING, oid.hash, &flag))
+ ret = fn(buf.buf, &oid, flag, cb_data);
+ strbuf_release(&buf);
- /* 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;
+ return ret;
}
-/* 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.
- */
-static int ref_resolves_to_object(struct ref_entry *entry)
+int for_each_glob_ref_in(each_ref_fn fn, const char *pattern,
+ const char *prefix, void *cb_data)
{
- 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;
-};
-
-/*
- * 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;
-
- /* 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;
-}
-
-/*
- * 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;
-}
-
-/*
- * 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));
- }
-}
-
-struct nonmatching_ref_data {
- const struct string_list *skip;
- const char *conflicting_refname;
-};
-
-static int nonmatching_ref_fn(struct ref_entry *entry, void *vdata)
-{
- 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.
- * Otherwise, return a negative value and write an explanation to err.
- * If extras is non-NULL, it is a list of additional refnames with
- * which refname is not allowed to conflict. If skip is non-NULL,
- * ignore potential conflicts with refs in skip (e.g., because they
- * are scheduled for deletion in the same operation). Behavior is
- * undefined if the same name is listed in both extras and skip.
- *
- * Two reference names conflict if one of them exactly matches the
- * leading components of the other; e.g., "refs/foo/bar" conflicts
- * with both "refs/foo" and with "refs/foo/bar/baz" but not with
- * "refs/foo/bar" or "refs/foo/barbados".
- *
- * extras and skip must be sorted.
- */
-static int verify_refname_available(const char *refname,
- const struct string_list *extras,
- const struct string_list *skip,
- struct ref_dir *dir,
- struct strbuf *err)
-{
- const char *slash;
- 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;
- }
-
- /*
- * 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.
- */
- 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 "$refname/"
- * (e.g., "refs/foo/bar/"). It is a problem
- * iff it contains any ref that is not in
- * "skip".
- */
- struct nonmatching_ref_data data;
-
- data.skip = skip;
- data.conflicting_refname = NULL;
- dir = get_ref_dir(dir->entries[pos]);
- sort_ref_dir(dir);
- if (do_for_each_entry_in_dir(dir, 0, nonmatching_ref_fn, &data)) {
- strbuf_addf(err, "'%s' exists; cannot create '%s'",
- data.conflicting_refname, refname);
- goto cleanup;
- }
- }
- }
-
- if (extras) {
- /*
- * Check for entries in extras that start with
- * "$refname/". We do that by looking for the place
- * where "$refname/" would be inserted in extras. If
- * there is an entry at that position that starts with
- * "$refname/" and is not in skip, then we have a
- * conflict.
- */
- for (pos = string_list_find_insert_index(extras, dirname.buf, 0);
- pos < extras->nr; pos++) {
- const char *extra_refname = extras->items[pos].string;
-
- if (!starts_with(extra_refname, dirname.buf))
- break;
-
- if (!skip || !string_list_has_string(skip, extra_refname)) {
- strbuf_addf(err, "cannot process '%s' and '%s' at the same time",
- refname, extra_refname);
- goto cleanup;
- }
- }
- }
-
- /* No conflicts were found */
- 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;
- }
-}
-
-static struct ref_cache *create_ref_cache(const char *submodule)
-{
- int len;
- struct ref_cache *refs;
- if (!submodule)
- submodule = "";
- len = strlen(submodule) + 1;
- refs = xcalloc(1, sizeof(struct ref_cache) + len);
- memcpy(refs->name, submodule, len);
- return refs;
-}
-
-/*
- * 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;
-
- if (!submodule || !*submodule)
- return &ref_cache;
-
- for (refs = submodule_ref_caches; refs; refs = refs->next)
- if (!strcmp(submodule, refs->name))
- return refs;
-
- refs = create_ref_cache(submodule);
- refs->next = submodule_ref_caches;
- submodule_ref_caches = refs;
- 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;
- }
- }
-
- 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)
-{
- 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);
- }
- }
- 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));
-}
-
-/*
- * Read the loose references from the namespace dirname into dir
- * (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)
-{
- struct ref_cache *refs = dir->ref_cache;
- DIR *d;
- struct dirent *de;
- int dirnamelen = strlen(dirname);
- struct strbuf refname;
- 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);
- path_baselen = path.len;
-
- d = opendir(path.buf);
- if (!d) {
- strbuf_release(&path);
- return;
- }
-
- strbuf_init(&refname, dirnamelen + 257);
- strbuf_add(&refname, dirname, dirnamelen);
-
- while ((de = readdir(d)) != NULL) {
- unsigned char sha1[20];
- struct stat st;
- int flag;
-
- if (de->d_name[0] == '.')
- continue;
- if (ends_with(de->d_name, ".lock"))
- continue;
- strbuf_addstr(&refname, de->d_name);
- strbuf_addstr(&path, de->d_name);
- if (stat(path.buf, &st) < 0) {
- ; /* silently ignore */
- } else if (S_ISDIR(st.st_mode)) {
- strbuf_addch(&refname, '/');
- add_entry_to_dir(dir,
- create_dir_entry(refs, 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);
- flag |= REF_ISBROKEN;
- } else if (is_null_sha1(sha1)) {
- /*
- * It is so astronomically unlikely
- * that NULL_SHA1 is the SHA-1 of an
- * actual object that we consider its
- * appearance in a loose reference
- * file to be repo corruption
- * (probably due to a software bug).
- */
- flag |= REF_ISBROKEN;
- }
-
- if (check_refname_format(refname.buf,
- REFNAME_ALLOW_ONELEVEL)) {
- if (!refname_is_safe(refname.buf))
- die("loose refname is dangerous: %s", refname.buf);
- hashclr(sha1);
- flag |= REF_BAD_NAME | REF_ISBROKEN;
- }
- add_entry_to_dir(dir,
- create_ref_entry(refname.buf, sha1, flag, 0));
- }
- strbuf_setlen(&refname, dirnamelen);
- strbuf_setlen(&path, path_baselen);
- }
- strbuf_release(&refname);
- strbuf_release(&path);
- closedir(d);
-}
-
-static struct ref_dir *get_loose_refs(struct ref_cache *refs)
-{
- if (!refs->loose) {
- /*
- * Mark the top-level directory complete because we
- * are about to read the only subdirectory that can
- * hold references:
- */
- refs->loose = create_dir_entry(refs, "", 0, 0);
- /*
- * Create an incomplete entry for "refs/":
- */
- add_entry_to_dir(get_ref_dir(refs->loose),
- create_dir_entry(refs, "refs/", 5, 1));
- }
- return get_ref_dir(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)
-{
- struct ref_entry *ref;
- struct ref_dir *dir = get_packed_refs(refs);
-
- ref = find_ref(dir, refname);
- if (ref == NULL)
- return -1;
-
- hashcpy(sha1, ref->u.value.oid.hash);
- return 0;
-}
-
-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;
-
- 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);
-
- len = read(fd, buffer, sizeof(buffer)-1);
- close(fd);
- if (len < 0)
- return -1;
- while (len && isspace(buffer[len-1]))
- len--;
- buffer[len] = 0;
-
- /* Was it a detached head or an old-fashioned symlink? */
- if (!get_sha1_hex(buffer, sha1))
- return 0;
-
- /* Symref? */
- if (strncmp(buffer, "ref:", 4))
- return -1;
- p = buffer + 4;
- while (isspace(*p))
- p++;
-
- return resolve_gitlink_ref_recursive(refs, p, sha1, recursion+1);
-}
-
-int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *sha1)
-{
- int len = strlen(path), retval;
- char *submodule;
- struct ref_cache *refs;
-
- while (len && path[len-1] == '/')
- len--;
- if (!len)
- return -1;
- submodule = xstrndup(path, len);
- refs = get_ref_cache(submodule);
- free(submodule);
-
- retval = resolve_gitlink_ref_recursive(refs, refname, sha1, 0);
- return retval;
-}
-
-/*
- * 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)
-{
- return find_ref(get_packed_refs(&ref_cache), refname);
-}
-
-/*
- * A loose ref file doesn't exist; check for a packed ref. The
- * options are forwarded from resolve_safe_unsafe().
- */
-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)
-{
- int depth = MAXDEPTH;
- int bad_name = 0;
-
- if (flags)
- *flags = 0;
-
- if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
- if (flags)
- *flags |= REF_BAD_NAME;
-
- 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;
-
- if (--depth < 0) {
- errno = ELOOP;
- return NULL;
- }
-
- strbuf_reset(sb_path);
- strbuf_git_path(sb_path, "%s", refname);
- path = sb_path->buf;
-
- /*
- * 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().
- */
- 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;
- }
- return refname;
- }
-
- /* 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;
- }
- }
-
- /* Is it a directory? */
- if (S_ISDIR(st.st_mode)) {
- errno = EISDIR;
- return NULL;
- }
-
- /*
- * 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);
-
- /*
- * Is it a symbolic ref?
- */
- if (!starts_with(sb_contents->buf, "ref:")) {
- /*
- * Please note that FETCH_HEAD has a second
- * line containing other data.
- */
- 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;
- }
- bad_name = 1;
- }
- }
-}
-
-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;
-}
-
-char *resolve_refdup(const char *refname, int resolve_flags,
- unsigned char *sha1, int *flags)
-{
- return xstrdup_or_null(resolve_ref_unsafe(refname, resolve_flags,
- sha1, flags));
-}
-
-/* The argument to filter_refs */
-struct ref_filter {
- const char *pattern;
- each_ref_fn *fn;
- void *cb_data;
-};
-
-int read_ref_full(const char *refname, int resolve_flags, unsigned char *sha1, int *flags)
-{
- if (resolve_ref_unsafe(refname, resolve_flags, sha1, flags))
- return 0;
- return -1;
-}
-
-int read_ref(const char *refname, unsigned char *sha1)
-{
- return read_ref_full(refname, RESOLVE_REF_READING, sha1, NULL);
-}
-
-int ref_exists(const char *refname)
-{
- unsigned char sha1[20];
- return !!resolve_ref_unsafe(refname, RESOLVE_REF_READING, sha1, NULL);
-}
-
-static int filter_refs(const char *refname, const struct object_id *oid,
- int flags, void *data)
-{
- struct ref_filter *filter = (struct ref_filter *)data;
-
- if (wildmatch(filter->pattern, refname, 0, NULL))
- return 0;
- return filter->fn(refname, oid, flags, filter->cb_data);
-}
-
-enum peel_status {
- /* object was peeled successfully: */
- PEEL_PEELED = 0,
-
- /*
- * object cannot be peeled because the named object (or an
- * object referred to by a tag in the peel chain), does not
- * exist.
- */
- PEEL_INVALID = -1,
-
- /* object cannot be peeled because it is not a tag: */
- PEEL_NON_TAG = -2,
-
- /* ref_entry contains no peeled value because it is a symref: */
- PEEL_IS_SYMREF = -3,
-
- /*
- * ref_entry cannot be peeled because it is broken (i.e., the
- * symbolic reference cannot even be resolved to an object
- * name):
- */
- PEEL_BROKEN = -4
-};
-
-/*
- * Peel the named object; i.e., if the object is a tag, resolve the
- * tag recursively until a non-tag is found. If successful, store the
- * result to sha1 and return PEEL_PEELED. If the object is not a tag
- * or is not valid, return PEEL_NON_TAG or PEEL_INVALID, respectively,
- * and leave sha1 unchanged.
- */
-static enum peel_status peel_object(const unsigned char *name, unsigned char *sha1)
-{
- struct object *o = lookup_unknown_object(name);
-
- if (o->type == OBJ_NONE) {
- int type = sha1_object_info(name, NULL);
- if (type < 0 || !object_as_type(o, type, 0))
- return PEEL_INVALID;
- }
-
- if (o->type != OBJ_TAG)
- return PEEL_NON_TAG;
-
- o = deref_tag_noverify(o);
- if (!o)
- return PEEL_INVALID;
-
- hashcpy(sha1, o->oid.hash);
- return PEEL_PEELED;
-}
-
-/*
- * 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;
-
- 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;
-
- 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;
-}
-
-int peel_ref(const char *refname, unsigned char *sha1)
-{
- int flag;
- unsigned char base[20];
-
- if (current_ref && (current_ref->name == refname
- || !strcmp(current_ref->name, refname))) {
- if (peel_entry(current_ref, 0))
- return -1;
- hashcpy(sha1, current_ref->u.value.peeled.hash);
- return 0;
- }
-
- if (read_ref_full(refname, RESOLVE_REF_READING, base, &flag))
- return -1;
-
- /*
- * If the reference is packed, read its ref_entry from the
- * cache in the hope that we already know its peeled value.
- * We only try this optimization on packed references because
- * (a) forcing the filling of the loose reference cache could
- * 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;
- }
- }
-
- return peel_object(base, sha1);
-}
-
-struct warn_if_dangling_data {
- FILE *fp;
- const char *refname;
- const struct string_list *refnames;
- const char *msg_fmt;
-};
-
-static int warn_if_dangling_symref(const char *refname, const struct object_id *oid,
- int flags, void *cb_data)
-{
- struct warn_if_dangling_data *d = cb_data;
- const char *resolves_to;
- struct object_id junk;
-
- if (!(flags & REF_ISSYMREF))
- return 0;
-
- resolves_to = resolve_ref_unsafe(refname, 0, junk.hash, NULL);
- if (!resolves_to
- || (d->refname
- ? strcmp(resolves_to, d->refname)
- : !string_list_has_string(d->refnames, resolves_to))) {
- return 0;
- }
-
- fprintf(d->fp, d->msg_fmt, refname);
- fputc('\n', d->fp);
- return 0;
-}
-
-void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname)
-{
- struct warn_if_dangling_data data;
-
- data.fp = fp;
- data.refname = refname;
- data.refnames = NULL;
- data.msg_fmt = msg_fmt;
- for_each_rawref(warn_if_dangling_symref, &data);
-}
-
-void warn_dangling_symrefs(FILE *fp, const char *msg_fmt, const struct string_list *refnames)
-{
- struct warn_if_dangling_data data;
-
- data.fp = fp;
- data.refname = NULL;
- data.refnames = refnames;
- data.msg_fmt = msg_fmt;
- for_each_rawref(warn_if_dangling_symref, &data);
-}
-
-/*
- * 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);
- }
-
- release_packed_ref_cache(packed_ref_cache);
- return retval;
-}
-
-/*
- * 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)
-{
- 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);
-}
-
-static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data)
-{
- struct object_id oid;
- int flag;
-
- if (submodule) {
- if (resolve_gitlink_ref(submodule, "HEAD", oid.hash) == 0)
- return fn("HEAD", &oid, 0, cb_data);
-
- return 0;
- }
-
- if (!read_ref_full("HEAD", RESOLVE_REF_READING, oid.hash, &flag))
- return fn("HEAD", &oid, flag, cb_data);
-
- return 0;
-}
-
-int head_ref(each_ref_fn fn, void *cb_data)
-{
- return do_head_ref(NULL, fn, cb_data);
-}
-
-int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
-{
- return do_head_ref(submodule, fn, cb_data);
-}
-
-int for_each_ref(each_ref_fn fn, void *cb_data)
-{
- return do_for_each_ref(&ref_cache, "", fn, 0, 0, cb_data);
-}
-
-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);
-}
-
-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);
-}
-
-int for_each_fullref_in(const char *prefix, each_ref_fn fn, void *cb_data, unsigned int broken)
-{
- unsigned int flag = 0;
-
- if (broken)
- flag = DO_FOR_EACH_INCLUDE_BROKEN;
- return do_for_each_ref(&ref_cache, prefix, fn, 0, flag, cb_data);
-}
-
-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);
-}
-
-int for_each_tag_ref(each_ref_fn fn, void *cb_data)
-{
- return for_each_ref_in("refs/tags/", fn, cb_data);
-}
-
-int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
-{
- return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data);
-}
-
-int for_each_branch_ref(each_ref_fn fn, void *cb_data)
-{
- return for_each_ref_in("refs/heads/", fn, cb_data);
-}
-
-int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
-{
- return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data);
-}
-
-int for_each_remote_ref(each_ref_fn fn, void *cb_data)
-{
- return for_each_ref_in("refs/remotes/", fn, cb_data);
-}
-
-int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
-{
- return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data);
-}
-
-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);
-}
-
-int head_ref_namespaced(each_ref_fn fn, void *cb_data)
-{
- struct strbuf buf = STRBUF_INIT;
- int ret = 0;
- struct object_id oid;
- int flag;
-
- strbuf_addf(&buf, "%sHEAD", get_git_namespace());
- if (!read_ref_full(buf.buf, RESOLVE_REF_READING, oid.hash, &flag))
- ret = fn(buf.buf, &oid, flag, cb_data);
- strbuf_release(&buf);
-
- return ret;
-}
-
-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;
-}
-
-int for_each_glob_ref_in(each_ref_fn fn, const char *pattern,
- const char *prefix, void *cb_data)
-{
- struct strbuf real_pattern = STRBUF_INIT;
- struct ref_filter filter;
- int ret;
+ struct strbuf real_pattern = STRBUF_INIT;
+ struct ref_filter filter;
+ int ret;
if (!prefix && !starts_with(pattern, "refs/"))
strbuf_addstr(&real_pattern, "refs/");
return for_each_glob_ref_in(fn, pattern, NULL, cb_data);
}
-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);
-}
-
const char *prettify_refname(const char *name)
{
return name + (
return 0;
}
-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);
-}
-
-/*
- * Verify that the reference locked by lock has the value old_sha1.
- * Fail if the reference doesn't exist and mustexist is set. Return 0
- * 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,
- 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)) {
- int save_errno = errno;
- strbuf_addf(err, "can't verify ref %s", lock->ref_name);
- errno = save_errno;
- return -1;
- }
- if (hashcmp(lock->old_oid.hash, old_sha1)) {
- strbuf_addf(err, "ref %s is at %s but expected %s",
- lock->ref_name,
- sha1_to_hex(lock->old_oid.hash),
- sha1_to_hex(old_sha1));
- errno = EBUSY;
- return -1;
- }
- return 0;
-}
-
-static int remove_empty_directories(struct strbuf *path)
-{
- /*
- * we want to create a file but there is a directory there;
- * if that is an empty directory (or a directory that contains
- * only empty directories), remove them.
- */
- return remove_dir_recursively(path, REMOVE_DIR_EMPTY_ONLY);
-}
-
/*
* *string and *len will only be substituted, and *string returned (for
* later free()ing) if the string passed in is a magic short-hand form
*log = xstrdup(it);
hashcpy(sha1, hash);
}
- if (!warn_ambiguous_refs)
- break;
- }
- free(last_branch);
- return logs_found;
-}
-
-/*
- * 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,
- const unsigned char *old_sha1,
- const struct string_list *extras,
- const struct string_list *skip,
- unsigned int flags, int *type_p,
- 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, lflags;
- int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
- int resolve_flags = 0;
- int attempts_remaining = 3;
-
- assert(err);
-
- lock = xcalloc(1, sizeof(struct ref_lock));
-
- if (mustexist)
- 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;
- }
-
- refname = resolve_ref_unsafe(refname, resolve_flags,
- lock->old_oid.hash, &type);
- if (!refname && 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)) {
- last_errno = errno;
- if (!verify_refname_available(orig_refname, extras, skip,
- get_loose_refs(&ref_cache), err))
- strbuf_addf(err, "there are still refs under '%s'",
- orig_refname);
- goto error_return;
- }
- refname = resolve_ref_unsafe(orig_refname, resolve_flags,
- lock->old_oid.hash, &type);
- }
- if (type_p)
- *type_p = type;
- if (!refname) {
- last_errno = errno;
- if (last_errno != ENOTDIR ||
- !verify_refname_available(orig_refname, extras, skip,
- get_loose_refs(&ref_cache), err))
- strbuf_addf(err, "unable to resolve reference %s: %s",
- orig_refname, strerror(last_errno));
-
- goto error_return;
- }
- /*
- * 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(refname, extras, skip,
- get_packed_refs(&ref_cache), err)) {
- last_errno = ENOTDIR;
- goto error_return;
- }
-
- lock->lk = xcalloc(1, sizeof(struct lock_file));
-
- lflags = 0;
- if (flags & REF_NODEREF) {
- refname = orig_refname;
- lflags |= LOCK_NO_DEREF;
- }
- 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 (old_sha1 && 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 (!packed_ref_cache->lock)
- die("internal error: packed-refs not locked");
-
- out = fdopen_lock_file(packed_ref_cache->lock, "w");
- if (!out)
- die_errno("unable to fdopen packed-refs descriptor");
-
- 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 (commit_lock_file(packed_ref_cache->lock)) {
- save_errno = errno;
- error = -1;
- }
- packed_ref_cache->lock = NULL;
- release_packed_ref_cache(packed_ref_cache);
- errno = save_errno;
- return error;
-}
-
-/*
- * 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);
-
- 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);
-}
-
-struct ref_to_prune {
- struct ref_to_prune *next;
- unsigned char sha1[20];
- char name[FLEX_ARRAY];
-};
-
-struct pack_refs_cb_data {
- unsigned int flags;
- struct ref_dir *packed_refs;
- struct ref_to_prune *ref_to_prune;
-};
-
-static int is_per_worktree_ref(const char *refname);
-
-/*
- * 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 (is_per_worktree_ref(entry->name))
- 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)) {
- int namelen = strlen(entry->name) + 1;
- struct ref_to_prune *n = xcalloc(1, sizeof(*n) + namelen);
- hashcpy(n->sha1, entry->u.value.oid.hash);
- memcpy(n->name, entry->name, namelen); /* includes NUL */
- 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.
- */
-static void try_remove_empty_parents(char *name)
-{
- char *p, *q;
- int i;
- p = name;
- for (i = 0; i < 2; i++) { /* refs/{heads,tags,...}/ */
- while (*p && *p != '/')
- p++;
- /* tolerate duplicate slashes; see check_refname_format() */
- while (*p == '/')
- p++;
- }
- for (q = p; *q; q++)
- ;
- while (1) {
- while (q > p && *q != '/')
- q--;
- while (q > p && *(q-1) == '/')
- q--;
- if (q == p)
- break;
- *q = '\0';
- if (rmdir(git_path("%s", name)))
- break;
- }
-}
-
-/* make sure nobody touched the ref, and unlink */
-static void prune_ref(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);
- if (!transaction ||
- ref_transaction_delete(transaction, r->name, r->sha1,
- REF_ISPRUNING, NULL, &err) ||
- ref_transaction_commit(transaction, &err)) {
- ref_transaction_free(transaction);
- error("%s", err.buf);
- strbuf_release(&err);
- return;
- }
- ref_transaction_free(transaction);
- strbuf_release(&err);
- try_remove_empty_parents(r->name);
-}
-
-static void prune_refs(struct ref_to_prune *r)
-{
- while (r) {
- prune_ref(r);
- r = r->next;
- }
-}
-
-int pack_refs(unsigned int flags)
-{
- struct pack_refs_cb_data cbdata;
-
- memset(&cbdata, 0, sizeof(cbdata));
- cbdata.flags = flags;
-
- lock_packed_refs(LOCK_DIE_ON_ERROR);
- cbdata.packed_refs = get_packed_refs(&ref_cache);
-
- do_for_each_entry_in_dir(get_loose_refs(&ref_cache), 0,
- pack_if_possible_fn, &cbdata);
-
- if (commit_packed_refs())
- die_errno("unable to overwrite old ref-pack file");
-
- prune_refs(cbdata.ref_to_prune);
- return 0;
-}
-
-/*
- * 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)
-{
- 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 */
-
- if (lock_packed_refs(0)) {
- unable_to_lock_message(git_path("packed-refs"), errno, err);
- return -1;
- }
- packed = get_packed_refs(&ref_cache);
-
- /* Remove refnames from the cache */
- for_each_string_list_item(refname, refnames)
- if (remove_entry(packed, refname->string) != -1)
- removed = 1;
- if (!removed) {
- /*
- * All packed entries disappeared while we were
- * acquiring the lock.
- */
- 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 (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) {
- /*
- * loose. The loose file name is the same as the
- * lockfile name, minus ".lock":
- */
- char *loose_filename = get_locked_file_path(lock->lk);
- int res = unlink_or_msg(loose_filename, err);
- free(loose_filename);
- if (res)
- return 1;
+ if (!warn_ambiguous_refs)
+ break;
}
- return 0;
+ free(last_branch);
+ return logs_found;
}
static int is_per_worktree_ref(const char *refname)
fd = hold_lock_file_for_update(&lock, filename,
LOCK_DIE_ON_ERROR);
if (fd < 0)
- die_errno(_("Could not open '%s' for writing"), filename);
- if (read_ref(pseudoref, actual_old_sha1))
- die("could not read ref '%s'", pseudoref);
- if (hashcmp(actual_old_sha1, old_sha1)) {
- warning("Unexpected sha1 when deleting %s", pseudoref);
- rollback_lock_file(&lock);
- return -1;
- }
-
- unlink(filename);
- rollback_lock_file(&lock);
- } else {
- unlink(filename);
- }
-
- return 0;
-}
-
-int delete_ref(const char *refname, const unsigned char *old_sha1,
- unsigned int flags)
-{
- struct ref_transaction *transaction;
- struct strbuf err = STRBUF_INIT;
-
- if (ref_type(refname) == REF_TYPE_PSEUDOREF)
- return delete_pseudoref(refname, old_sha1);
-
- transaction = ref_transaction_begin(&err);
- if (!transaction ||
- ref_transaction_delete(transaction, refname, old_sha1,
- flags, NULL, &err) ||
- ref_transaction_commit(transaction, &err)) {
- error("%s", err.buf);
- ref_transaction_free(transaction);
- strbuf_release(&err);
- return 1;
- }
- ref_transaction_free(transaction);
- strbuf_release(&err);
- return 0;
-}
-
-int delete_refs(struct string_list *refnames)
-{
- 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);
-
- goto out;
- }
-
- for (i = 0; i < refnames->nr; i++) {
- const char *refname = refnames->items[i].string;
-
- if (delete_ref(refname, NULL, 0))
- result |= error(_("could not remove reference %s"), refname);
- }
-
-out:
- strbuf_release(&err);
- return result;
-}
-
-/*
- * People using contrib's git-new-workdir have .git/logs/refs ->
- * /some/other/path/.git/logs/refs, and that may live on another device.
- *
- * 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"
-
-static int rename_tmp_log(const char *newrefname)
-{
- int attempts_remaining = 4;
- struct strbuf path = STRBUF_INIT;
- int ret = -1;
-
- 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;
- }
-
- 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;
- }
- }
- ret = 0;
-out:
- strbuf_release(&path);
- return ret;
-}
-
-static int rename_ref_available(const char *oldname, const char *newname)
-{
- struct string_list skip = STRING_LIST_INIT_NODUP;
- struct strbuf err = STRBUF_INIT;
- int ret;
-
- string_list_insert(&skip, oldname);
- ret = !verify_refname_available(newname, NULL, &skip,
- get_packed_refs(&ref_cache), &err)
- && !verify_refname_available(newname, NULL, &skip,
- get_loose_refs(&ref_cache), &err);
- if (!ret)
- error("%s", err.buf);
-
- string_list_clear(&skip, 0);
- strbuf_release(&err);
- 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];
- 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 err = STRBUF_INIT;
-
- if (log && S_ISLNK(loginfo.st_mode))
- return error("reflog for %s is a symlink", oldrefname);
-
- 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 (!rename_ref_available(oldrefname, newrefname))
- return 1;
-
- 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 (delete_ref(oldrefname, orig_sha1, 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) {
- struct strbuf path = STRBUF_INIT;
- int result;
-
- strbuf_git_path(&path, "%s", newrefname);
- result = remove_empty_directories(&path);
- strbuf_release(&path);
-
- if (result) {
- error("Directory not empty: %s", newrefname);
- goto rollback;
- }
- } else {
- error("unable to delete existing %s", newrefname);
- goto rollback;
- }
- }
-
- if (log && rename_tmp_log(newrefname))
- goto rollback;
-
- logmoved = log;
-
- lock = lock_ref_sha1_basic(newrefname, NULL, NULL, NULL, 0, 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);
-
- if (write_ref_to_lockfile(lock, orig_sha1, &err) ||
- commit_ref_update(lock, orig_sha1, logmsg, 0, &err)) {
- error("unable to write current sha1 into %s: %s", newrefname, err.buf);
- strbuf_release(&err);
- goto rollback;
- }
-
- return 0;
-
- rollback:
- lock = lock_ref_sha1_basic(oldrefname, NULL, NULL, NULL, 0, NULL, &err);
- if (!lock) {
- error("unable to lock %s for rollback: %s", oldrefname, err.buf);
- strbuf_release(&err);
- goto rollbacklog;
- }
-
- 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)) {
- 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)))
- 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",
- oldrefname, strerror(errno));
-
- return 1;
-}
-
-static int close_ref(struct ref_lock *lock)
-{
- if (close_lock_file(lock->lk))
- return -1;
- return 0;
-}
-
-static int commit_ref(struct ref_lock *lock)
-{
- if (commit_lock_file(lock->lk))
- return -1;
- return 0;
-}
-
-/*
- * copy the reflog message msg to buf, which has been allocated sufficiently
- * large, while cleaning up the whitespaces. Especially, convert LF to space,
- * because reflog file is one line per entry.
- */
-static int copy_msg(char *buf, const char *msg)
-{
- char *cp = buf;
- char c;
- int wasspace = 1;
-
- *cp++ = '\t';
- while ((c = *msg++)) {
- if (wasspace && isspace(c))
- continue;
- wasspace = isspace(c);
- if (wasspace)
- c = ' ';
- *cp++ = c;
- }
- while (buf < cp && isspace(cp[-1]))
- cp--;
- *cp++ = '\n';
- return cp - buf;
-}
-
-static int should_autocreate_reflog(const char *refname)
-{
- if (!log_all_ref_updates)
- return 0;
- return starts_with(refname, "refs/heads/") ||
- starts_with(refname, "refs/remotes/") ||
- starts_with(refname, "refs/notes/") ||
- !strcmp(refname, "HEAD");
-}
-
-/*
- * 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.
- */
-static int log_ref_setup(const char *refname, struct strbuf *logfile, struct strbuf *err, int force_create)
-{
- int logfd, oflags = O_APPEND | O_WRONLY;
-
- 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;
- }
-
- logfd = open(logfile->buf, oflags, 0666);
- if (logfd < 0) {
- if (!(oflags & O_CREAT) && (errno == ENOENT || errno == EISDIR))
- return 0;
-
- 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);
- }
-
- if (logfd < 0) {
- strbuf_addf(err, "unable to append to %s: %s",
- logfile->buf, strerror(errno));
- return -1;
- }
- }
-
- adjust_shared_perm(logfile->buf);
- close(logfd);
- return 0;
-}
-
-
-int safe_create_reflog(const char *refname, int force_create, struct strbuf *err)
-{
- int ret;
- struct strbuf sb = STRBUF_INIT;
-
- ret = log_ref_setup(refname, &sb, err, force_create);
- strbuf_release(&sb);
- return ret;
-}
-
-static int log_ref_write_fd(int fd, const unsigned char *old_sha1,
- const unsigned char *new_sha1,
- const char *committer, const char *msg)
-{
- int msglen, written;
- unsigned maxlen, len;
- char *logrec;
-
- msglen = msg ? strlen(msg) : 0;
- 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),
- committer);
- if (msglen)
- len += copy_msg(logrec + len - 1, msg) - 1;
-
- written = len <= maxlen ? write_in_full(fd, logrec, len) : -1;
- free(logrec);
- if (written != len)
- return -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)
-{
- int logfd, result, oflags = O_APPEND | O_WRONLY;
-
- if (log_all_ref_updates < 0)
- log_all_ref_updates = !is_bare_repository();
-
- result = log_ref_setup(refname, logfile, err, flags & REF_FORCE_CREATE_REFLOG);
-
- if (result)
- return result;
-
- logfd = open(logfile->buf, oflags);
- if (logfd < 0)
- return 0;
- result = log_ref_write_fd(logfd, old_sha1, new_sha1,
- git_committer_info(0), msg);
- if (result) {
- strbuf_addf(err, "unable to append to %s: %s", logfile->buf,
- strerror(errno));
- close(logfd);
- return -1;
- }
- if (close(logfd)) {
- strbuf_addf(err, "unable to append to %s: %s", logfile->buf,
- strerror(errno));
- 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)
-{
- 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;
-}
-
-int is_branch(const char *refname)
-{
- return !strcmp(refname, "HEAD") || starts_with(refname, "refs/heads/");
-}
-
-/*
- * 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)
-{
- static char term = '\n';
- struct object *o;
- int fd;
-
- o = parse_object(sha1);
- if (!o) {
- strbuf_addf(err,
- "Trying to write ref %s with nonexistent object %s",
- lock->ref_name, sha1_to_hex(sha1));
- 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);
- unlock_ref(lock);
- return -1;
- }
- fd = get_lock_file_fd(lock->lk);
- if (write_in_full(fd, sha1_to_hex(sha1), 40) != 40 ||
- write_in_full(fd, &term, 1) != 1 ||
- close_ref(lock) < 0) {
- strbuf_addf(err,
- "Couldn't write %s", get_lock_file_path(lock->lk));
- unlock_ref(lock);
- return -1;
- }
- return 0;
-}
-
-/*
- * Commit a change to a loose reference that has already been written
- * 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)) {
- 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);
- return -1;
- }
- if (strcmp(lock->orig_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
- * for example) then logically the HEAD reflog should be
- * updated too.
- * A generic solution implies reverse symref information,
- * but finding all symrefs pointing to the 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).
- */
- unsigned char head_sha1[20];
- int head_flag;
- const char *head_ref;
- head_ref = resolve_ref_unsafe("HEAD", RESOLVE_REF_READING,
- head_sha1, &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)) {
- error("%s", log_err.buf);
- strbuf_release(&log_err);
- }
+ die_errno(_("Could not open '%s' for writing"), filename);
+ if (read_ref(pseudoref, actual_old_sha1))
+ die("could not read ref '%s'", pseudoref);
+ if (hashcmp(actual_old_sha1, old_sha1)) {
+ warning("Unexpected sha1 when deleting %s", pseudoref);
+ rollback_lock_file(&lock);
+ return -1;
}
- }
- if (commit_ref(lock)) {
- error("Couldn't set %s", lock->ref_name);
- unlock_ref(lock);
- return -1;
+
+ unlink(filename);
+ rollback_lock_file(&lock);
+ } else {
+ unlink(filename);
}
- unlock_ref(lock);
return 0;
}
-int create_symref(const char *ref_target, const char *refs_heads_master,
- const char *logmsg)
+int delete_ref(const char *refname, const unsigned char *old_sha1,
+ unsigned int flags)
{
- char *lockpath = NULL;
- char ref[1000];
- int fd, len, written;
- char *git_HEAD = git_pathdup("%s", ref_target);
- unsigned char old_sha1[20], new_sha1[20];
+ struct ref_transaction *transaction;
struct strbuf err = STRBUF_INIT;
- if (logmsg && read_ref(ref_target, old_sha1))
- hashclr(old_sha1);
-
- if (safe_create_leading_directories(git_HEAD) < 0)
- return error("unable to create directory for %s", git_HEAD);
+ if (ref_type(refname) == REF_TYPE_PSEUDOREF)
+ return delete_pseudoref(refname, old_sha1);
-#ifndef NO_SYMLINK_HEAD
- if (prefer_symlink_refs) {
- unlink(git_HEAD);
- if (!symlink(refs_heads_master, git_HEAD))
- goto done;
- fprintf(stderr, "no symlink - falling back to symbolic ref\n");
+ transaction = ref_transaction_begin(&err);
+ if (!transaction ||
+ ref_transaction_delete(transaction, refname, old_sha1,
+ flags, NULL, &err) ||
+ ref_transaction_commit(transaction, &err)) {
+ error("%s", err.buf);
+ ref_transaction_free(transaction);
+ strbuf_release(&err);
+ return 1;
}
-#endif
+ ref_transaction_free(transaction);
+ strbuf_release(&err);
+ return 0;
+}
- len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master);
- if (sizeof(ref) <= len) {
- error("refname too long: %s", refs_heads_master);
- goto error_free_return;
- }
- lockpath = mkpathdup("%s.lock", git_HEAD);
- fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666);
- if (fd < 0) {
- error("Unable to open %s for writing", lockpath);
- goto error_free_return;
- }
- written = write_in_full(fd, ref, len);
- if (close(fd) != 0 || written != len) {
- error("Unable to write to %s", lockpath);
- goto error_unlink_return;
- }
- if (rename(lockpath, git_HEAD) < 0) {
- error("Unable to create %s", git_HEAD);
- goto error_unlink_return;
- }
- if (adjust_shared_perm(git_HEAD)) {
- error("Unable to fix permissions on %s", lockpath);
- error_unlink_return:
- unlink_or_warn(lockpath);
- error_free_return:
- free(lockpath);
- free(git_HEAD);
- return -1;
- }
- free(lockpath);
+int copy_reflog_msg(char *buf, const char *msg)
+{
+ char *cp = buf;
+ char c;
+ int wasspace = 1;
-#ifndef NO_SYMLINK_HEAD
- done:
-#endif
- if (logmsg && !read_ref(refs_heads_master, new_sha1) &&
- log_ref_write(ref_target, old_sha1, new_sha1, logmsg, 0, &err)) {
- error("%s", err.buf);
- strbuf_release(&err);
+ *cp++ = '\t';
+ while ((c = *msg++)) {
+ if (wasspace && isspace(c))
+ continue;
+ wasspace = isspace(c);
+ if (wasspace)
+ c = ' ';
+ *cp++ = c;
}
+ while (buf < cp && isspace(cp[-1]))
+ cp--;
+ *cp++ = '\n';
+ return cp - buf;
+}
- free(git_HEAD);
- return 0;
+int should_autocreate_reflog(const char *refname)
+{
+ if (!log_all_ref_updates)
+ return 0;
+ return starts_with(refname, "refs/heads/") ||
+ starts_with(refname, "refs/remotes/") ||
+ starts_with(refname, "refs/notes/") ||
+ !strcmp(refname, "HEAD");
+}
+
+int is_branch(const char *refname)
+{
+ return !strcmp(refname, "HEAD") || starts_with(refname, "refs/heads/");
}
struct read_ref_at_cb {
return 1;
}
-int reflog_exists(const char *refname)
-{
- struct stat st;
-
- return !lstat(git_path("logs/%s", refname), &st) &&
- S_ISREG(st.st_mode);
-}
-
-int delete_reflog(const char *refname)
-{
- return remove_path(git_path("logs/%s", refname));
-}
-
-static int show_one_reflog_ent(struct strbuf *sb, each_reflog_ent_fn fn, void *cb_data)
-{
- unsigned char osha1[20], nsha1[20];
- char *email_end, *message;
- unsigned long timestamp;
- int tz;
-
- /* 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, '>')) ||
- email_end[1] != ' ' ||
- !(timestamp = strtoul(email_end + 2, &message, 10)) ||
- !message || message[0] != ' ' ||
- (message[1] != '+' && message[1] != '-') ||
- !isdigit(message[2]) || !isdigit(message[3]) ||
- !isdigit(message[4]) || !isdigit(message[5]))
- return 0; /* corrupt? */
- email_end[1] = '\0';
- tz = strtol(message + 1, NULL, 10);
- if (message[6] != '\t')
- message += 6;
- else
- message += 7;
- return fn(osha1, nsha1, sb->buf + 82, timestamp, tz, message, cb_data);
-}
-
-static char *find_beginning_of_line(char *bob, char *scan)
-{
- while (bob < scan && *(--scan) != '\n')
- ; /* keep scanning backwards */
- /*
- * Return either beginning of the buffer, or LF at the end of
- * the previous line.
- */
- return scan;
-}
-
-int for_each_reflog_ent_reverse(const char *refname, each_reflog_ent_fn fn, void *cb_data)
-{
- struct strbuf sb = STRBUF_INIT;
- FILE *logfp;
- long pos;
- int ret = 0, at_tail = 1;
-
- logfp = fopen(git_path("logs/%s", refname), "r");
- 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));
- pos = ftell(logfp);
- while (!ret && 0 < pos) {
- int cnt;
- size_t nread;
- char buf[BUFSIZ];
- char *endp, *scanp;
-
- /* 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));
- nread = fread(buf, cnt, 1, logfp);
- if (nread != 1)
- return error("cannot read %d bytes from reflog for %s: %s",
- cnt, refname, strerror(errno));
- pos -= cnt;
-
- scanp = endp = buf + cnt;
- if (at_tail && scanp[-1] == '\n')
- /* Looking at the final LF at the end of the file */
- scanp--;
- at_tail = 0;
-
- while (buf < scanp) {
- /*
- * terminating LF of the previous line, or the beginning
- * of the buffer.
- */
- char *bp;
-
- bp = find_beginning_of_line(buf, scanp);
-
- if (*bp == '\n') {
- /*
- * The newline is the end of the previous line,
- * so we know we have complete line starting
- * at (bp + 1). Prefix it onto any prior data
- * we collected for the line and process it.
- */
- strbuf_splice(&sb, 0, 0, bp + 1, endp - (bp + 1));
- scanp = bp;
- endp = bp + 1;
- ret = show_one_reflog_ent(&sb, fn, cb_data);
- strbuf_reset(&sb);
- if (ret)
- break;
- } else if (!pos) {
- /*
- * We are at the start of the buffer, and the
- * start of the file; there is no previous
- * line, and we have everything for this one.
- * Process it, and we can end the loop.
- */
- strbuf_splice(&sb, 0, 0, buf, endp - buf);
- ret = show_one_reflog_ent(&sb, fn, cb_data);
- strbuf_reset(&sb);
- break;
- }
-
- if (bp == buf) {
- /*
- * We are at the start of the buffer, and there
- * is more file to read backwards. Which means
- * we are in the middle of a line. Note that we
- * may get here even if *bp was a newline; that
- * just means we are at the exact end of the
- * previous line, rather than some spot in the
- * middle.
- *
- * Save away what we have to be combined with
- * the data from the next read.
- */
- strbuf_splice(&sb, 0, 0, buf, endp - buf);
- break;
- }
- }
-
- }
- if (!ret && sb.len)
- die("BUG: reverse reflog parser had leftover data");
-
- fclose(logfp);
- strbuf_release(&sb);
- return ret;
-}
-
-int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, void *cb_data)
-{
- FILE *logfp;
- struct strbuf sb = STRBUF_INIT;
- int ret = 0;
-
- logfp = fopen(git_path("logs/%s", refname), "r");
- if (!logfp)
- return -1;
-
- while (!ret && !strbuf_getwholeline(&sb, logfp, '\n'))
- ret = show_one_reflog_ent(&sb, fn, cb_data);
- fclose(logfp);
- 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;
-
- while ((de = readdir(d)) != NULL) {
- struct stat st;
-
- if (de->d_name[0] == '.')
- continue;
- if (ends_with(de->d_name, ".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;
- }
- strbuf_setlen(name, oldlen);
- }
- closedir(d);
- return retval;
-}
-
-int for_each_reflog(each_ref_fn fn, void *cb_data)
-{
- int retval;
- struct strbuf name;
- strbuf_init(&name, PATH_MAX);
- retval = do_for_each_reflog(&name, fn, cb_data);
- strbuf_release(&name);
- return retval;
-}
-
-/**
- * Information needed for a single ref update. Set new_sha1 to the new
- * value or to null_sha1 to delete the ref. To check the old value
- * while the ref is locked, set (flags & REF_HAVE_OLD) and set
- * old_sha1 to the old value, or to null_sha1 to ensure the ref does
- * not exist before update.
- */
-struct ref_update {
- /*
- * If (flags & REF_HAVE_NEW), set the reference to this value:
- */
- unsigned char new_sha1[20];
- /*
- * If (flags & REF_HAVE_OLD), check that the reference
- * previously had this value:
- */
- unsigned char old_sha1[20];
- /*
- * One or more of REF_HAVE_NEW, REF_HAVE_OLD, REF_NODEREF,
- * REF_DELETING, and REF_ISPRUNING:
- */
- unsigned int flags;
- struct ref_lock *lock;
- int type;
- char *msg;
- const char refname[FLEX_ARRAY];
-};
-
-/*
- * Transaction states.
- * OPEN: The transaction is in a valid state and can accept new updates.
- * An OPEN transaction can be committed.
- * CLOSED: A closed transaction is no longer active and no other operations
- * than free can be used on it in this state.
- * A transaction can either become closed by successfully committing
- * an active transaction or if there is a failure while building
- * the transaction thus rendering it failed/inactive.
- */
-enum ref_transaction_state {
- REF_TRANSACTION_OPEN = 0,
- REF_TRANSACTION_CLOSED = 1
-};
-
-/*
- * Data structure for holding a reference transaction, which can
- * consist of checks and updates to multiple references, carried out
- * as atomically as possible. This structure is opaque to callers.
- */
-struct ref_transaction {
- struct ref_update **updates;
- size_t alloc;
- size_t nr;
- enum ref_transaction_state state;
-};
-
struct ref_transaction *ref_transaction_begin(struct strbuf *err)
{
assert(err);
return 0;
}
-static int ref_update_reject_duplicates(struct string_list *refnames,
- struct strbuf *err)
-{
- int i, n = refnames->nr;
-
- assert(err);
-
- for (i = 1; i < n; i++)
- if (!strcmp(refnames->items[i - 1].string, refnames->items[i].string)) {
- strbuf_addf(err,
- "Multiple updates for ref '%s' not allowed.",
- refnames->items[i].string);
- return 1;
- }
- return 0;
-}
-
-int ref_transaction_commit(struct ref_transaction *transaction,
- struct strbuf *err)
-{
- 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;
- struct string_list affected_refnames = STRING_LIST_INIT_NODUP;
-
- assert(err);
-
- if (transaction->state != REF_TRANSACTION_OPEN)
- die("BUG: commit called for transaction that is not open");
-
- if (!n) {
- transaction->state = REF_TRANSACTION_CLOSED;
- return 0;
- }
-
- /* 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);
- string_list_sort(&affected_refnames);
- if (ref_update_reject_duplicates(&affected_refnames, err)) {
- ret = TRANSACTION_GENERIC_ERROR;
- goto cleanup;
- }
-
- /*
- * 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.
- */
- for (i = 0; i < n; i++) {
- struct ref_update *update = 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));
-
- 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);
-
- /*
- * 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);
- 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;
- 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;
- }
-
- if (!(update->flags & REF_ISPRUNING))
- string_list_append(&refs_to_delete,
- update->lock->ref_name);
- }
- }
-
- if (repack_without_refs(&refs_to_delete, 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);
-
-cleanup:
- transaction->state = REF_TRANSACTION_CLOSED;
-
- for (i = 0; i < n; i++)
- if (updates[i]->lock)
- unlock_ref(updates[i]->lock);
- string_list_clear(&refs_to_delete, 0);
- string_list_clear(&affected_refnames, 0);
- return ret;
-}
-
-static int ref_present(const char *refname,
- const struct object_id *oid, int flags, void *cb_data)
-{
- struct string_list *affected_refnames = cb_data;
-
- return string_list_has_string(affected_refnames, refname);
-}
-
-int initial_ref_transaction_commit(struct ref_transaction *transaction,
- struct strbuf *err)
-{
- struct ref_dir *loose_refs = get_loose_refs(&ref_cache);
- struct ref_dir *packed_refs = get_packed_refs(&ref_cache);
- int ret = 0, i;
- int n = transaction->nr;
- struct ref_update **updates = transaction->updates;
- struct string_list affected_refnames = STRING_LIST_INIT_NODUP;
-
- assert(err);
-
- if (transaction->state != REF_TRANSACTION_OPEN)
- 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);
- string_list_sort(&affected_refnames);
- if (ref_update_reject_duplicates(&affected_refnames, err)) {
- ret = TRANSACTION_GENERIC_ERROR;
- goto cleanup;
- }
-
- /*
- * It's really undefined to call this function in an active
- * repository or when there are existing references: we are
- * only locking and changing packed-refs, so (1) any
- * simultaneous processes might try to change a reference at
- * the same time we do, and (2) any existing loose versions of
- * the references that we are setting would have precedence
- * over our values. But some remote helpers create the remote
- * "HEAD" and "master" branches before calling this function,
- * 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))
- die("BUG: initial ref transaction called with existing refs");
-
- for (i = 0; i < n; i++) {
- struct ref_update *update = updates[i];
-
- if ((update->flags & REF_HAVE_OLD) &&
- !is_null_sha1(update->old_sha1))
- die("BUG: initial ref transaction with old_sha1 set");
- if (verify_refname_available(update->refname,
- &affected_refnames, NULL,
- loose_refs, err) ||
- verify_refname_available(update->refname,
- &affected_refnames, NULL,
- packed_refs, err)) {
- ret = TRANSACTION_NAME_CONFLICT;
- goto cleanup;
- }
- }
-
- if (lock_packed_refs(0)) {
- strbuf_addf(err, "unable to lock packed-refs file: %s",
- strerror(errno));
- ret = TRANSACTION_GENERIC_ERROR;
- goto cleanup;
- }
-
- for (i = 0; i < n; i++) {
- struct ref_update *update = updates[i];
-
- if ((update->flags & REF_HAVE_NEW) &&
- !is_null_sha1(update->new_sha1))
- add_packed_ref(update->refname, update->new_sha1);
- }
-
- if (commit_packed_refs()) {
- strbuf_addf(err, "unable to commit packed-refs file: %s",
- strerror(errno));
- ret = TRANSACTION_GENERIC_ERROR;
- goto cleanup;
- }
-
-cleanup:
- transaction->state = REF_TRANSACTION_CLOSED;
- string_list_clear(&affected_refnames, 0);
- return ret;
-}
-
char *shorten_unambiguous_ref(const char *refname, int strict)
{
int i;
return 0;
}
-struct expire_reflog_cb {
- unsigned int flags;
- reflog_expiry_should_prune_fn *should_prune_fn;
- void *policy_cb;
- FILE *newlog;
- unsigned char last_kept_sha1[20];
-};
-
-static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
- const char *email, unsigned long 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;
-
- if ((*cb->should_prune_fn)(osha1, nsha1, email, timestamp, tz,
- message, policy_cb)) {
- if (!cb->newlog)
- printf("would prune %s", message);
- else if (cb->flags & EXPIRE_REFLOGS_VERBOSE)
- 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),
- email, timestamp, tz, message);
- hashcpy(cb->last_kept_sha1, nsha1);
- }
- 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)
+const char *find_descendant_ref(const char *dirname,
+ const struct string_list *extras,
+ const struct string_list *skip)
{
- static struct lock_file reflog_lock;
- struct expire_reflog_cb cb;
- struct ref_lock *lock;
- char *log_file;
- int status = 0;
- int type;
- struct strbuf err = STRBUF_INIT;
+ int pos;
- memset(&cb, 0, sizeof(cb));
- cb.flags = flags;
- cb.policy_cb = policy_cb_data;
- cb.should_prune_fn = should_prune_fn;
+ if (!extras)
+ return NULL;
/*
- * The reflog file is locked by holding the lock on the
- * reference itself, plus we might need to update the
- * reference if --updateref was specified:
+ * Look at the place where dirname would be inserted into
+ * extras. If there is an entry at that position that starts
+ * with dirname (remember, dirname includes the trailing
+ * slash) and is not in skip, then we have a conflict.
*/
- lock = lock_ref_sha1_basic(refname, sha1, NULL, NULL, 0, &type, &err);
- if (!lock) {
- error("cannot lock ref '%s': %s", refname, err.buf);
- strbuf_release(&err);
- return -1;
- }
- if (!reflog_exists(refname)) {
- unlock_ref(lock);
- return 0;
- }
+ for (pos = string_list_find_insert_index(extras, dirname, 0);
+ pos < extras->nr; pos++) {
+ const char *extra_refname = extras->items[pos].string;
- log_file = git_pathdup("logs/%s", refname);
- if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) {
- /*
- * Even though holding $GIT_DIR/logs/$reflog.lock has
- * no locking implications, we use the lock_file
- * machinery here anyway because it does a lot of the
- * work we need, including cleaning up if the program
- * exits unexpectedly.
- */
- if (hold_lock_file_for_update(&reflog_lock, log_file, 0) < 0) {
- struct strbuf err = STRBUF_INIT;
- unable_to_lock_message(log_file, errno, &err);
- error("%s", err.buf);
- strbuf_release(&err);
- goto failure;
- }
- cb.newlog = fdopen_lock_file(&reflog_lock, "w");
- if (!cb.newlog) {
- error("cannot fdopen %s (%s)",
- get_lock_file_path(&reflog_lock), strerror(errno));
- goto failure;
- }
+ if (!starts_with(extra_refname, dirname))
+ break;
+
+ if (!skip || !string_list_has_string(skip, extra_refname))
+ return extra_refname;
}
+ return NULL;
+}
- (*prepare_fn)(refname, sha1, cb.policy_cb);
- for_each_reflog_ent(refname, expire_reflog_ent, &cb);
- (*cleanup_fn)(cb.policy_cb);
+int rename_ref_available(const char *oldname, const char *newname)
+{
+ struct string_list skip = STRING_LIST_INIT_NODUP;
+ struct strbuf err = STRBUF_INIT;
+ int ret;
- if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) {
- /*
- * It doesn't make sense to adjust a reference pointed
- * to by a symbolic ref based on expiring entries in
- * the symbolic reference's reflog. Nor can we update
- * a reference if there are no remaining reflog
- * entries.
- */
- int update = (flags & EXPIRE_REFLOGS_UPDATE_REF) &&
- !(type & REF_ISSYMREF) &&
- !is_null_sha1(cb.last_kept_sha1);
-
- 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 ||
- write_str_in_full(get_lock_file_fd(lock->lk), "\n") != 1 ||
- close_ref(lock) < 0)) {
- status |= error("couldn't write %s",
- get_lock_file_path(lock->lk));
- rollback_lock_file(&reflog_lock);
- } else if (commit_lock_file(&reflog_lock)) {
- status |= error("unable to commit reflog '%s' (%s)",
- log_file, strerror(errno));
- } else if (update && commit_ref(lock)) {
- status |= error("couldn't set %s", lock->ref_name);
- }
- }
- free(log_file);
- unlock_ref(lock);
- return status;
-
- failure:
- rollback_lock_file(&reflog_lock);
- free(log_file);
- unlock_ref(lock);
- return -1;
+ string_list_insert(&skip, oldname);
+ ret = !verify_refname_available(newname, NULL, &skip, &err);
+ if (!ret)
+ error("%s", err.buf);
+
+ string_list_clear(&skip, 0);
+ strbuf_release(&err);
+ return ret;
}