#include "../cache.h"
+#include "../config.h"
#include "../refs.h"
#include "refs-internal.h"
#include "ref-cache.h"
+#include "packed-backend.h"
#include "../iterator.h"
#include "../dir-iterator.h"
#include "../lockfile.h"
struct object_id old_oid;
};
-/*
- * Return true if refname, which has the specified oid and flags, can
- * be resolved to an object in the database. If the referred-to object
- * does not exist, emit a warning and return false.
- */
-static int ref_resolves_to_object(const char *refname,
- const struct object_id *oid,
- unsigned int flags)
-{
- if (flags & REF_ISBROKEN)
- return 0;
- if (!has_sha1_file(oid->hash)) {
- error("%s does not point to a valid object!", refname);
- return 0;
- }
- return 1;
-}
-
-struct packed_ref_cache {
- struct ref_cache *cache;
-
- /*
- * Count of references to the data structure in this instance,
- * including the pointer from files_ref_store::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.
char *gitdir;
char *gitcommondir;
- char *packed_refs_path;
struct ref_cache *loose;
- struct packed_ref_cache *packed;
-};
-
-/* 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_cache(packed_refs->cache);
- stat_validity_clear(&packed_refs->validity);
- free(packed_refs);
- return 1;
- } else {
- return 0;
- }
-}
-
-static void clear_packed_ref_cache(struct files_ref_store *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);
- }
-}
+ struct ref_store *packed_ref_store;
+};
static void clear_loose_ref_cache(struct files_ref_store *refs)
{
get_common_dir_noenv(&sb, gitdir);
refs->gitcommondir = strbuf_detach(&sb, NULL);
strbuf_addf(&sb, "%s/packed-refs", refs->gitcommondir);
- refs->packed_refs_path = strbuf_detach(&sb, NULL);
+ refs->packed_ref_store = packed_ref_store_create(sb.buf, flags);
+ strbuf_release(&sb);
return ref_store;
}
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_entry(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);
-}
-
-static const char *files_packed_refs_path(struct files_ref_store *refs)
-{
- return refs->packed_refs_path;
-}
-
static void files_reflog_path(struct files_ref_store *refs,
struct strbuf *sb,
const char *refname)
}
}
-/*
- * Get the packed_ref_cache for the specified files_ref_store,
- * creating it if necessary.
- */
-static struct packed_ref_cache *get_packed_ref_cache(struct files_ref_store *refs)
-{
- const char *packed_refs_file = files_packed_refs_path(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->cache = create_ref_cache(&refs->base, NULL);
- refs->packed->cache->root->flag &= ~REF_INCOMPLETE;
- 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->cache->root));
- fclose(f);
- }
- }
- 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->cache->root);
-}
-
-static struct ref_dir *get_packed_refs(struct files_ref_store *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(struct files_ref_store *refs,
- const char *refname, const unsigned char *sha1)
-{
- struct packed_ref_cache *packed_ref_cache = get_packed_ref_cache(refs);
-
- if (!packed_ref_cache->lock)
- die("internal error: packed refs not locked");
- add_ref_entry(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
strbuf_add(&refname, dirname, dirnamelen);
while ((de = readdir(d)) != NULL) {
- unsigned char sha1[20];
+ struct object_id oid;
struct stat st;
int flag;
if (!refs_resolve_ref_unsafe(&refs->base,
refname.buf,
RESOLVE_REF_READING,
- sha1, &flag)) {
- hashclr(sha1);
+ oid.hash, &flag)) {
+ oidclr(&oid);
flag |= REF_ISBROKEN;
- } else if (is_null_sha1(sha1)) {
+ } else if (is_null_oid(&oid)) {
/*
* It is so astronomically unlikely
* that NULL_SHA1 is the SHA-1 of an
REFNAME_ALLOW_ONELEVEL)) {
if (!refname_is_safe(refname.buf))
die("loose refname is dangerous: %s", refname.buf);
- hashclr(sha1);
+ oidclr(&oid);
flag |= REF_BAD_NAME | REF_ISBROKEN;
}
add_entry_to_dir(dir,
- create_ref_entry(refname.buf, sha1, flag, 0));
+ create_ref_entry(refname.buf, &oid, flag));
}
strbuf_setlen(&refname, dirnamelen);
strbuf_setlen(&path, path_baselen);
return refs->loose;
}
-/*
- * 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(struct files_ref_store *refs,
- const char *refname)
-{
- return find_ref_entry(get_packed_refs(refs), refname);
-}
-
-/*
- * A loose ref file doesn't exist; check for a packed ref.
- */
-static int resolve_packed_ref(struct files_ref_store *refs,
- const char *refname,
- unsigned char *sha1, unsigned int *flags)
-{
- struct ref_entry *entry;
-
- /*
- * The loose reference file does not exist; check for a packed
- * reference.
- */
- entry = get_packed_ref(refs, refname);
- if (entry) {
- hashcpy(sha1, entry->u.value.oid.hash);
- *flags |= REF_ISPACKED;
- return 0;
- }
- /* refname is not a packed reference. */
- return -1;
-}
-
static int files_read_raw_ref(struct ref_store *ref_store,
const char *refname, unsigned char *sha1,
struct strbuf *referent, unsigned int *type)
if (lstat(path, &st) < 0) {
if (errno != ENOENT)
goto out;
- if (resolve_packed_ref(refs, refname, sha1, type)) {
+ if (refs_read_raw_ref(refs->packed_ref_store, refname,
+ sha1, referent, type)) {
errno = ENOENT;
goto out;
}
* ref is supposed to be, there could still be a
* packed ref:
*/
- if (resolve_packed_ref(refs, refname, sha1, type)) {
+ if (refs_read_raw_ref(refs->packed_ref_store, refname,
+ sha1, referent, type)) {
errno = EISDIR;
goto out;
}
/*
* If the ref did not exist and we are creating it,
- * make sure there is no existing ref that conflicts
- * with refname:
+ * make sure there is no existing packed ref that
+ * conflicts with refname:
*/
if (refs_verify_refname_available(
- &refs->base, refname,
+ refs->packed_ref_store, refname,
extras, skip, err))
goto error_return;
}
* 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(refs, refname);
- if (r) {
- if (peel_entry(r, 0))
- return -1;
- hashcpy(sha1, r->u.value.peeled.hash);
- return 0;
- }
- }
+ if (flag & REF_ISPACKED &&
+ !refs_peel_ref(refs->packed_ref_store, refname, sha1))
+ return 0;
return peel_object(base, sha1);
}
struct files_ref_iterator {
struct ref_iterator base;
- struct packed_ref_cache *packed_ref_cache;
struct ref_iterator *iter0;
unsigned int flags;
};
if (iter->iter0)
ok = ref_iterator_abort(iter->iter0);
- release_packed_ref_cache(iter->packed_ref_cache);
base_ref_iterator_free(ref_iterator);
return ok;
}
struct ref_iterator *loose_iter, *packed_iter;
struct files_ref_iterator *iter;
struct ref_iterator *ref_iterator;
+ unsigned int required_flags = REF_STORE_READ;
- if (ref_paranoia < 0)
- ref_paranoia = git_env_bool("GIT_REF_PARANOIA", 0);
- if (ref_paranoia)
- flags |= DO_FOR_EACH_INCLUDE_BROKEN;
+ if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN))
+ required_flags |= REF_STORE_ODB;
- refs = files_downcast(ref_store,
- REF_STORE_READ | (ref_paranoia ? 0 : REF_STORE_ODB),
- "ref_iterator_begin");
+ refs = files_downcast(ref_store, required_flags, "ref_iterator_begin");
iter = xcalloc(1, sizeof(*iter));
ref_iterator = &iter->base;
* (If they've already been read, that's OK; we only need to
* guarantee that they're read before the packed refs, not
* *how much* before.) After that, we call
- * get_packed_ref_cache(), which internally checks whether the
- * packed-ref cache is up to date with what is on disk, and
- * re-reads it if not.
+ * packed_ref_iterator_begin(), which internally checks
+ * whether the packed-ref cache is up to date with what is on
+ * disk, and re-reads it if not.
*/
loose_iter = cache_ref_iterator_begin(get_loose_ref_cache(refs),
prefix, 1);
- iter->packed_ref_cache = get_packed_ref_cache(refs);
- acquire_packed_ref_cache(iter->packed_ref_cache);
- packed_iter = cache_ref_iterator_begin(iter->packed_ref_cache->cache,
- prefix, 0);
+ /*
+ * The packed-refs file might contain broken references, for
+ * example an old version of a reference that points at an
+ * object that has since been garbage-collected. This is OK as
+ * long as there is a corresponding loose reference that
+ * overrides it, and we don't want to emit an error message in
+ * this case. So ask the packed_ref_store for all of its
+ * references, and (if needed) do our own check for broken
+ * ones in files_ref_iterator_advance(), after we have merged
+ * the packed and loose references.
+ */
+ packed_iter = refs_ref_iterator_begin(
+ refs->packed_ref_store, prefix, 0,
+ DO_FOR_EACH_INCLUDE_BROKEN);
iter->iter0 = overlay_ref_iterator_begin(loose_iter, packed_iter);
iter->flags = flags;
* our refname.
*/
if (is_null_oid(&lock->old_oid) &&
- refs_verify_refname_available(&refs->base, refname,
+ refs_verify_refname_available(refs->packed_ref_store, refname,
extras, skip, err)) {
last_errno = ENOTDIR;
goto error_return;
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, const char *refname,
- const unsigned char *sha1,
- const 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));
-}
-
-/*
- * 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(struct files_ref_store *refs, int flags)
-{
- static int timeout_configured = 0;
- static int timeout_value = 1000;
- struct packed_ref_cache *packed_ref_cache;
-
- files_assert_main_repository(refs, "lock_packed_refs");
-
- if (!timeout_configured) {
- git_config_get_int("core.packedrefstimeout", &timeout_value);
- timeout_configured = 1;
- }
-
- if (hold_lock_file_for_update_timeout(
- &packlock, files_packed_refs_path(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(refs);
- 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(struct files_ref_store *refs)
-{
- struct packed_ref_cache *packed_ref_cache =
- get_packed_ref_cache(refs);
- int ok, error = 0;
- int save_errno = 0;
- FILE *out;
- struct ref_iterator *iter;
-
- files_assert_main_repository(refs, "commit_packed_refs");
-
- 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);
-
- iter = cache_ref_iterator_begin(packed_ref_cache->cache, NULL, 0);
- while ((ok = ref_iterator_advance(iter)) == ITER_OK) {
- struct object_id peeled;
- int peel_error = ref_iterator_peel(iter, &peeled);
-
- write_packed_entry(out, iter->refname, iter->oid->hash,
- peel_error ? NULL : peeled.hash);
- }
-
- if (ok != ITER_DONE)
- die("error while iterating over references");
-
- 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(struct files_ref_store *refs)
-{
- struct packed_ref_cache *packed_ref_cache =
- get_packed_ref_cache(refs);
-
- files_assert_main_repository(refs, "rollback_packed_refs");
-
- 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(refs);
-}
-
struct ref_to_prune {
struct ref_to_prune *next;
unsigned char sha1[20];
}
}
+/*
+ * Return true if the specified reference should be packed.
+ */
+static int should_pack_ref(const char *refname,
+ const struct object_id *oid, unsigned int ref_flags,
+ unsigned int pack_flags)
+{
+ /* Do not pack per-worktree refs: */
+ if (ref_type(refname) != REF_TYPE_NORMAL)
+ return 0;
+
+ /* Do not pack non-tags unless PACK_REFS_ALL is set: */
+ if (!(pack_flags & PACK_REFS_ALL) && !starts_with(refname, "refs/tags/"))
+ return 0;
+
+ /* Do not pack symbolic refs: */
+ if (ref_flags & REF_ISSYMREF)
+ return 0;
+
+ /* Do not pack broken refs: */
+ if (!ref_resolves_to_object(refname, oid, ref_flags))
+ return 0;
+
+ return 1;
+}
+
static int files_pack_refs(struct ref_store *ref_store, unsigned int flags)
{
struct files_ref_store *refs =
files_downcast(ref_store, REF_STORE_WRITE | REF_STORE_ODB,
"pack_refs");
struct ref_iterator *iter;
- struct ref_dir *packed_refs;
int ok;
struct ref_to_prune *refs_to_prune = NULL;
+ struct strbuf err = STRBUF_INIT;
- lock_packed_refs(refs, LOCK_DIE_ON_ERROR);
- packed_refs = get_packed_refs(refs);
+ packed_refs_lock(refs->packed_ref_store, LOCK_DIE_ON_ERROR, &err);
iter = cache_ref_iterator_begin(get_loose_ref_cache(refs), NULL, 0);
while ((ok = ref_iterator_advance(iter)) == ITER_OK) {
* in the packed ref cache. If the reference should be
* pruned, also add it to refs_to_prune.
*/
- struct ref_entry *packed_entry;
- int is_tag_ref = starts_with(iter->refname, "refs/tags/");
-
- /* Do not pack per-worktree refs: */
- if (ref_type(iter->refname) != REF_TYPE_NORMAL)
- continue;
-
- /* ALWAYS pack tags */
- if (!(flags & PACK_REFS_ALL) && !is_tag_ref)
- continue;
-
- /* Do not pack symbolic or broken refs: */
- if (iter->flags & REF_ISSYMREF)
- continue;
-
- if (!ref_resolves_to_object(iter->refname, iter->oid, iter->flags))
+ if (!should_pack_ref(iter->refname, iter->oid, iter->flags,
+ flags))
continue;
/*
* we don't copy the peeled status, because we want it
* to be re-peeled.
*/
- packed_entry = find_ref_entry(packed_refs, iter->refname);
- if (packed_entry) {
- /* Overwrite existing packed entry with info from loose entry */
- packed_entry->flag = REF_ISPACKED;
- oidcpy(&packed_entry->u.value.oid, iter->oid);
- } else {
- packed_entry = create_ref_entry(iter->refname, iter->oid->hash,
- REF_ISPACKED, 0);
- add_ref_entry(packed_refs, packed_entry);
- }
- oidclr(&packed_entry->u.value.peeled);
+ add_packed_ref(refs->packed_ref_store, iter->refname, iter->oid);
/* Schedule the loose reference for pruning if requested. */
if ((flags & PACK_REFS_PRUNE)) {
if (ok != ITER_DONE)
die("error while iterating over references");
- if (commit_packed_refs(refs))
- die_errno("unable to overwrite old ref-pack file");
+ if (commit_packed_refs(refs->packed_ref_store, &err))
+ die("unable to overwrite old ref-pack file: %s", err.buf);
+ packed_refs_unlock(refs->packed_ref_store);
prune_refs(refs, refs_to_prune);
+ strbuf_release(&err);
return 0;
}
-/*
- * 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 files_ref_store *refs,
- struct string_list *refnames, struct strbuf *err)
-{
- struct ref_dir *packed;
- struct string_list_item *refname;
- int ret, needs_repacking = 0, removed = 0;
-
- files_assert_main_repository(refs, "repack_without_refs");
- assert(err);
-
- /* Look for a packed ref */
- for_each_string_list_item(refname, refnames) {
- if (get_packed_ref(refs, 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(refs, 0)) {
- unable_to_lock_message(files_packed_refs_path(refs), errno, err);
- return -1;
- }
- packed = get_packed_refs(refs);
-
- /* Remove refnames from the cache */
- for_each_string_list_item(refname, refnames)
- if (remove_entry_from_dir(packed, refname->string) != -1)
- removed = 1;
- if (!removed) {
- /*
- * All packed entries disappeared while we were
- * acquiring the lock.
- */
- rollback_packed_refs(refs);
- return 0;
- }
-
- /* Write what remains */
- ret = commit_packed_refs(refs);
- if (ret)
- strbuf_addf(err, "unable to overwrite old ref-pack file: %s",
- strerror(errno));
- return ret;
-}
-
-static int files_delete_refs(struct ref_store *ref_store,
+static int files_delete_refs(struct ref_store *ref_store, const char *msg,
struct string_list *refnames, unsigned int flags)
{
struct files_ref_store *refs =
if (!refnames->nr)
return 0;
- result = repack_without_refs(refs, refnames, &err);
- if (result) {
- /*
- * If we failed to rewrite the packed-refs file, then
- * it is unsafe to try to remove loose refs, because
- * doing so might expose an obsolete packed value for
- * a reference that might even point at an object that
- * has been garbage collected.
- */
- if (refnames->nr == 1)
- error(_("could not delete reference %s: %s"),
- refnames->items[0].string, err.buf);
- else
- error(_("could not delete references: %s"), err.buf);
+ if (packed_refs_lock(refs->packed_ref_store, 0, &err))
+ goto error;
- goto out;
+ if (repack_without_refs(refs->packed_ref_store, refnames, &err)) {
+ packed_refs_unlock(refs->packed_ref_store);
+ goto error;
}
+ packed_refs_unlock(refs->packed_ref_store);
+
for (i = 0; i < refnames->nr; i++) {
const char *refname = refnames->items[i].string;
- if (refs_delete_ref(&refs->base, NULL, refname, NULL, flags))
+ if (refs_delete_ref(&refs->base, msg, refname, NULL, flags))
result |= error(_("could not remove reference %s"), refname);
}
-out:
strbuf_release(&err);
return result;
+
+error:
+ /*
+ * If we failed to rewrite the packed-refs file, then it is
+ * unsafe to try to remove loose refs, because doing so might
+ * expose an obsolete packed value for a reference that might
+ * even point at an object that has been garbage collected.
+ */
+ if (refnames->nr == 1)
+ error(_("could not delete reference %s: %s"),
+ refnames->items[0].string, err.buf);
+ else
+ error(_("could not delete references: %s"), err.buf);
+
+ strbuf_release(&err);
+ return -1;
}
/*
}
static int write_ref_to_lockfile(struct ref_lock *lock,
- const unsigned char *sha1, struct strbuf *err);
+ const struct object_id *oid, struct strbuf *err);
static int commit_ref_update(struct files_ref_store *refs,
struct ref_lock *lock,
- const unsigned char *sha1, const char *logmsg,
+ const struct object_id *oid, const char *logmsg,
struct strbuf *err);
static int files_rename_ref(struct ref_store *ref_store,
{
struct files_ref_store *refs =
files_downcast(ref_store, REF_STORE_WRITE, "rename_ref");
- unsigned char sha1[20], orig_sha1[20];
+ struct object_id oid, orig_oid;
int flag = 0, logmoved = 0;
struct ref_lock *lock;
struct stat loginfo;
if (!refs_resolve_ref_unsafe(&refs->base, oldrefname,
RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE,
- orig_sha1, &flag)) {
+ orig_oid.hash, &flag)) {
ret = error("refname %s not found", oldrefname);
goto out;
}
}
if (refs_delete_ref(&refs->base, logmsg, oldrefname,
- orig_sha1, REF_NODEREF)) {
+ orig_oid.hash, REF_NODEREF)) {
error("unable to delete old %s", oldrefname);
goto rollback;
}
/*
- * Since we are doing a shallow lookup, sha1 is not the
- * correct value to pass to delete_ref as old_sha1. But that
- * doesn't matter, because an old_sha1 check wouldn't add to
+ * Since we are doing a shallow lookup, oid is not the
+ * correct value to pass to delete_ref as old_oid. But that
+ * doesn't matter, because an old_oid check wouldn't add to
* the safety anyway; we want to delete the reference whatever
* its current value.
*/
if (!refs_read_ref_full(&refs->base, newrefname,
RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE,
- sha1, NULL) &&
+ oid.hash, NULL) &&
refs_delete_ref(&refs->base, NULL, newrefname,
NULL, REF_NODEREF)) {
if (errno == EISDIR) {
strbuf_release(&err);
goto rollback;
}
- hashcpy(lock->old_oid.hash, orig_sha1);
+ oidcpy(&lock->old_oid, &orig_oid);
- if (write_ref_to_lockfile(lock, orig_sha1, &err) ||
- commit_ref_update(refs, lock, orig_sha1, logmsg, &err)) {
+ if (write_ref_to_lockfile(lock, &orig_oid, &err) ||
+ commit_ref_update(refs, lock, &orig_oid, logmsg, &err)) {
error("unable to write current sha1 into %s: %s", newrefname, err.buf);
strbuf_release(&err);
goto rollback;
flag = log_all_ref_updates;
log_all_ref_updates = LOG_REFS_NONE;
- if (write_ref_to_lockfile(lock, orig_sha1, &err) ||
- commit_ref_update(refs, lock, orig_sha1, NULL, &err)) {
+ if (write_ref_to_lockfile(lock, &orig_oid, &err) ||
+ commit_ref_update(refs, lock, &orig_oid, NULL, &err)) {
error("unable to write current sha1 into %s: %s", oldrefname, err.buf);
strbuf_release(&err);
}
return 0;
}
-static int log_ref_write_fd(int fd, const unsigned char *old_sha1,
- const unsigned char *new_sha1,
+static int log_ref_write_fd(int fd, const struct object_id *old_oid,
+ const struct object_id *new_oid,
const char *committer, const char *msg)
{
int msglen, written;
maxlen = strlen(committer) + msglen + 100;
logrec = xmalloc(maxlen);
len = xsnprintf(logrec, maxlen, "%s %s %s\n",
- sha1_to_hex(old_sha1),
- sha1_to_hex(new_sha1),
+ oid_to_hex(old_oid),
+ oid_to_hex(new_oid),
committer);
if (msglen)
len += copy_reflog_msg(logrec + len - 1, msg) - 1;
}
static int files_log_ref_write(struct files_ref_store *refs,
- const char *refname, const unsigned char *old_sha1,
- const unsigned char *new_sha1, const char *msg,
+ const char *refname, const struct object_id *old_oid,
+ const struct object_id *new_oid, const char *msg,
int flags, struct strbuf *err)
{
int logfd, result;
if (logfd < 0)
return 0;
- result = log_ref_write_fd(logfd, old_sha1, new_sha1,
+ result = log_ref_write_fd(logfd, old_oid, new_oid,
git_committer_info(0), msg);
if (result) {
struct strbuf sb = STRBUF_INIT;
* return -1.
*/
static int write_ref_to_lockfile(struct ref_lock *lock,
- const unsigned char *sha1, struct strbuf *err)
+ const struct object_id *oid, struct strbuf *err)
{
static char term = '\n';
struct object *o;
int fd;
- o = parse_object(sha1);
+ o = parse_object(oid);
if (!o) {
strbuf_addf(err,
"trying to write ref '%s' with nonexistent object %s",
- lock->ref_name, sha1_to_hex(sha1));
+ lock->ref_name, oid_to_hex(oid));
unlock_ref(lock);
return -1;
}
if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
strbuf_addf(err,
"trying to write non-commit object %s to branch '%s'",
- sha1_to_hex(sha1), lock->ref_name);
+ oid_to_hex(oid), lock->ref_name);
unlock_ref(lock);
return -1;
}
fd = get_lock_file_fd(lock->lk);
- if (write_in_full(fd, sha1_to_hex(sha1), 40) != 40 ||
+ if (write_in_full(fd, oid_to_hex(oid), GIT_SHA1_HEXSZ) != GIT_SHA1_HEXSZ ||
write_in_full(fd, &term, 1) != 1 ||
close_ref(lock) < 0) {
strbuf_addf(err,
*/
static int commit_ref_update(struct files_ref_store *refs,
struct ref_lock *lock,
- const unsigned char *sha1, const char *logmsg,
+ const struct object_id *oid, const char *logmsg,
struct strbuf *err)
{
files_assert_main_repository(refs, "commit_ref_update");
clear_loose_ref_cache(refs);
if (files_log_ref_write(refs, lock->ref_name,
- lock->old_oid.hash, sha1,
+ &lock->old_oid, oid,
logmsg, 0, err)) {
char *old_msg = strbuf_detach(err, NULL);
strbuf_addf(err, "cannot update the ref '%s': %s",
* check with HEAD only which should cover 99% of all usage
* scenarios (even 100% of the default ones).
*/
- unsigned char head_sha1[20];
+ struct object_id head_oid;
int head_flag;
const char *head_ref;
head_ref = refs_resolve_ref_unsafe(&refs->base, "HEAD",
RESOLVE_REF_READING,
- head_sha1, &head_flag);
+ head_oid.hash, &head_flag);
if (head_ref && (head_flag & REF_ISSYMREF) &&
!strcmp(head_ref, lock->ref_name)) {
struct strbuf log_err = STRBUF_INIT;
if (files_log_ref_write(refs, "HEAD",
- lock->old_oid.hash, sha1,
+ &lock->old_oid, oid,
logmsg, 0, &log_err)) {
error("%s", log_err.buf);
strbuf_release(&log_err);
const char *target, const char *logmsg)
{
struct strbuf err = STRBUF_INIT;
- unsigned char new_sha1[20];
+ struct object_id new_oid;
if (logmsg &&
!refs_read_ref_full(&refs->base, target,
- RESOLVE_REF_READING, new_sha1, NULL) &&
- files_log_ref_write(refs, refname, lock->old_oid.hash,
- new_sha1, logmsg, 0, &err)) {
+ RESOLVE_REF_READING, new_oid.hash, NULL) &&
+ files_log_ref_write(refs, refname, &lock->old_oid,
+ &new_oid, logmsg, 0, &err)) {
error("%s", err.buf);
strbuf_release(&err);
}
return ret;
}
-int set_worktree_head_symref(const char *gitdir, const char *target, const char *logmsg)
-{
- /*
- * FIXME: this obviously will not work well for future refs
- * backends. This function needs to die.
- */
- struct files_ref_store *refs =
- files_downcast(get_main_ref_store(),
- REF_STORE_WRITE,
- "set_head_symref");
-
- static struct lock_file head_lock;
- struct ref_lock *lock;
- struct strbuf head_path = STRBUF_INIT;
- const char *head_rel;
- int ret;
-
- strbuf_addf(&head_path, "%s/HEAD", absolute_path(gitdir));
- if (hold_lock_file_for_update(&head_lock, head_path.buf,
- LOCK_NO_DEREF) < 0) {
- struct strbuf err = STRBUF_INIT;
- unable_to_lock_message(head_path.buf, errno, &err);
- error("%s", err.buf);
- strbuf_release(&err);
- strbuf_release(&head_path);
- return -1;
- }
-
- /* head_rel will be "HEAD" for the main tree, "worktrees/wt/HEAD" for
- linked trees */
- head_rel = remove_leading_path(head_path.buf,
- absolute_path(get_git_common_dir()));
- /* to make use of create_symref_locked(), initialize ref_lock */
- lock = xcalloc(1, sizeof(struct ref_lock));
- lock->lk = &head_lock;
- lock->ref_name = xstrdup(head_rel);
-
- ret = create_symref_locked(refs, lock, head_rel, target, logmsg);
-
- unlock_ref(lock); /* will free lock */
- strbuf_release(&head_path);
- return ret;
-}
-
static int files_reflog_exists(struct ref_store *ref_store,
const char *refname)
{
{
struct object_id ooid, noid;
char *email_end, *message;
- unsigned long timestamp;
+ timestamp_t timestamp;
int tz;
const char *p = sb->buf;
parse_oid_hex(p, &noid, &p) || *p++ != ' ' ||
!(email_end = strchr(p, '>')) ||
email_end[1] != ' ' ||
- !(timestamp = strtoul(email_end + 2, &message, 10)) ||
+ !(timestamp = parse_timestamp(email_end + 2, &message, 10)) ||
!message || message[0] != ' ' ||
(message[1] != '+' && message[1] != '-') ||
!isdigit(message[2]) || !isdigit(message[3]) ||
return ref_iterator;
}
-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;
-}
-
/*
* If update is a direct update of head_ref (the reference pointed to
* by HEAD), then add an extra REF_LOG_ONLY update for HEAD.
new_update = ref_transaction_add_update(
transaction, "HEAD",
update->flags | REF_LOG_ONLY | REF_NODEREF,
- update->new_sha1, update->old_sha1,
+ update->new_oid.hash, update->old_oid.hash,
update->msg);
item->util = new_update;
new_update = ref_transaction_add_update(
transaction, referent, new_flags,
- update->new_sha1, update->old_sha1,
+ update->new_oid.hash, update->old_oid.hash,
update->msg);
new_update->parent_update = update;
struct strbuf *err)
{
if (!(update->flags & REF_HAVE_OLD) ||
- !hashcmp(oid->hash, update->old_sha1))
+ !oidcmp(oid, &update->old_oid))
return 0;
- if (is_null_sha1(update->old_sha1))
+ if (is_null_oid(&update->old_oid))
strbuf_addf(err, "cannot lock ref '%s': "
"reference already exists",
original_update_refname(update));
strbuf_addf(err, "cannot lock ref '%s': "
"reference is missing but expected %s",
original_update_refname(update),
- sha1_to_hex(update->old_sha1));
+ oid_to_hex(&update->old_oid));
else
strbuf_addf(err, "cannot lock ref '%s': "
"is at %s but expected %s",
original_update_refname(update),
oid_to_hex(oid),
- sha1_to_hex(update->old_sha1));
+ oid_to_hex(&update->old_oid));
return -1;
}
{
struct strbuf referent = STRBUF_INIT;
int mustexist = (update->flags & REF_HAVE_OLD) &&
- !is_null_sha1(update->old_sha1);
+ !is_null_oid(&update->old_oid);
int ret;
struct ref_lock *lock;
files_assert_main_repository(refs, "lock_ref_for_update");
- if ((update->flags & REF_HAVE_NEW) && is_null_sha1(update->new_sha1))
+ if ((update->flags & REF_HAVE_NEW) && is_null_oid(&update->new_oid))
update->flags |= REF_DELETING;
if (head_ref) {
!(update->flags & REF_DELETING) &&
!(update->flags & REF_LOG_ONLY)) {
if (!(update->type & REF_ISSYMREF) &&
- !hashcmp(lock->old_oid.hash, update->new_sha1)) {
+ !oidcmp(&lock->old_oid, &update->new_oid)) {
/*
* The reference already has the desired
* value, so we don't need to write it.
*/
- } else if (write_ref_to_lockfile(lock, update->new_sha1,
+ } else if (write_ref_to_lockfile(lock, &update->new_oid,
err)) {
char *write_err = strbuf_detach(err, NULL);
return 0;
}
-static int files_transaction_commit(struct ref_store *ref_store,
- struct ref_transaction *transaction,
- struct strbuf *err)
+/*
+ * Unlock any references in `transaction` that are still locked, and
+ * mark the transaction closed.
+ */
+static void files_transaction_cleanup(struct ref_transaction *transaction)
+{
+ size_t i;
+
+ for (i = 0; i < transaction->nr; i++) {
+ struct ref_update *update = transaction->updates[i];
+ struct ref_lock *lock = update->backend_data;
+
+ if (lock) {
+ unlock_ref(lock);
+ update->backend_data = NULL;
+ }
+ }
+
+ transaction->state = REF_TRANSACTION_CLOSED;
+}
+
+static int files_transaction_prepare(struct ref_store *ref_store,
+ struct ref_transaction *transaction,
+ struct strbuf *err)
{
struct files_ref_store *refs =
files_downcast(ref_store, REF_STORE_WRITE,
- "ref_transaction_commit");
- int ret = 0, i;
- struct string_list refs_to_delete = STRING_LIST_INIT_NODUP;
- struct string_list_item *ref_to_delete;
+ "ref_transaction_prepare");
+ size_t i;
+ int ret = 0;
struct string_list affected_refnames = STRING_LIST_INIT_NODUP;
char *head_ref = NULL;
int head_type;
struct object_id head_oid;
- struct strbuf sb = STRBUF_INIT;
assert(err);
- if (transaction->state != REF_TRANSACTION_OPEN)
- die("BUG: commit called for transaction that is not open");
-
- if (!transaction->nr) {
- transaction->state = REF_TRANSACTION_CLOSED;
- return 0;
- }
+ if (!transaction->nr)
+ goto cleanup;
/*
* Fail if a refname appears more than once in the
head_oid.hash, &head_type);
if (head_ref && !(head_type & REF_ISSYMREF)) {
- free(head_ref);
- head_ref = NULL;
+ FREE_AND_NULL(head_ref);
}
/*
* that new values are valid, and write new values to the
* lockfiles, ready to be activated. Only keep one lockfile
* open at a time to avoid running out of file descriptors.
+ * Note that lock_ref_for_update() might append more updates
+ * to the transaction.
*/
for (i = 0; i < transaction->nr; i++) {
struct ref_update *update = transaction->updates[i];
ret = lock_ref_for_update(refs, update, transaction,
head_ref, &affected_refnames, err);
if (ret)
- goto cleanup;
+ break;
+ }
+
+cleanup:
+ free(head_ref);
+ string_list_clear(&affected_refnames, 0);
+
+ if (ret)
+ files_transaction_cleanup(transaction);
+ else
+ transaction->state = REF_TRANSACTION_PREPARED;
+
+ return ret;
+}
+
+static int files_transaction_finish(struct ref_store *ref_store,
+ struct ref_transaction *transaction,
+ struct strbuf *err)
+{
+ struct files_ref_store *refs =
+ files_downcast(ref_store, 0, "ref_transaction_finish");
+ size_t i;
+ int ret = 0;
+ struct string_list refs_to_delete = STRING_LIST_INIT_NODUP;
+ struct string_list_item *ref_to_delete;
+ struct strbuf sb = STRBUF_INIT;
+
+ assert(err);
+
+ if (!transaction->nr) {
+ transaction->state = REF_TRANSACTION_CLOSED;
+ return 0;
}
/* Perform updates first so live commits remain referenced */
update->flags & REF_LOG_ONLY) {
if (files_log_ref_write(refs,
lock->ref_name,
- lock->old_oid.hash,
- update->new_sha1,
+ &lock->old_oid,
+ &update->new_oid,
update->msg, update->flags,
err)) {
char *old_msg = strbuf_detach(err, NULL);
}
}
- if (repack_without_refs(refs, &refs_to_delete, err)) {
+ if (packed_refs_lock(refs->packed_ref_store, 0, err)) {
ret = TRANSACTION_GENERIC_ERROR;
goto cleanup;
}
+ if (repack_without_refs(refs->packed_ref_store, &refs_to_delete, err)) {
+ ret = TRANSACTION_GENERIC_ERROR;
+ packed_refs_unlock(refs->packed_ref_store);
+ goto cleanup;
+ }
+
+ packed_refs_unlock(refs->packed_ref_store);
+
/* Delete the reflogs of any references that were deleted: */
for_each_string_list_item(ref_to_delete, &refs_to_delete) {
strbuf_reset(&sb);
clear_loose_ref_cache(refs);
cleanup:
- strbuf_release(&sb);
- transaction->state = REF_TRANSACTION_CLOSED;
+ files_transaction_cleanup(transaction);
for (i = 0; i < transaction->nr; i++) {
struct ref_update *update = transaction->updates[i];
- struct ref_lock *lock = update->backend_data;
-
- if (lock)
- unlock_ref(lock);
if (update->flags & REF_DELETED_LOOSE) {
/*
}
}
+ strbuf_release(&sb);
string_list_clear(&refs_to_delete, 0);
- free(head_ref);
- string_list_clear(&affected_refnames, 0);
-
return ret;
}
+static int files_transaction_abort(struct ref_store *ref_store,
+ struct ref_transaction *transaction,
+ struct strbuf *err)
+{
+ files_transaction_cleanup(transaction);
+ return 0;
+}
+
static int ref_present(const char *refname,
const struct object_id *oid, int flags, void *cb_data)
{
struct files_ref_store *refs =
files_downcast(ref_store, REF_STORE_WRITE,
"initial_ref_transaction_commit");
- int ret = 0, i;
+ size_t i;
+ int ret = 0;
struct string_list affected_refnames = STRING_LIST_INIT_NODUP;
assert(err);
struct ref_update *update = transaction->updates[i];
if ((update->flags & REF_HAVE_OLD) &&
- !is_null_sha1(update->old_sha1))
+ !is_null_oid(&update->old_oid))
die("BUG: initial ref transaction with old_sha1 set");
if (refs_verify_refname_available(&refs->base, update->refname,
&affected_refnames, NULL,
}
}
- if (lock_packed_refs(refs, 0)) {
- strbuf_addf(err, "unable to lock packed-refs file: %s",
- strerror(errno));
+ if (packed_refs_lock(refs->packed_ref_store, 0, err)) {
ret = TRANSACTION_GENERIC_ERROR;
goto cleanup;
}
struct ref_update *update = transaction->updates[i];
if ((update->flags & REF_HAVE_NEW) &&
- !is_null_sha1(update->new_sha1))
- add_packed_ref(refs, update->refname, update->new_sha1);
+ !is_null_oid(&update->new_oid))
+ add_packed_ref(refs->packed_ref_store, update->refname,
+ &update->new_oid);
}
- if (commit_packed_refs(refs)) {
- strbuf_addf(err, "unable to commit packed-refs file: %s",
- strerror(errno));
+ if (commit_packed_refs(refs->packed_ref_store, err)) {
ret = TRANSACTION_GENERIC_ERROR;
goto cleanup;
}
cleanup:
+ packed_refs_unlock(refs->packed_ref_store);
transaction->state = REF_TRANSACTION_CLOSED;
string_list_clear(&affected_refnames, 0);
return ret;
};
static int expire_reflog_ent(struct object_id *ooid, struct object_id *noid,
- const char *email, unsigned long timestamp, int tz,
+ const char *email, timestamp_t timestamp, int tz,
const char *message, void *cb_data)
{
struct expire_reflog_cb *cb = cb_data;
if (cb->flags & EXPIRE_REFLOGS_REWRITE)
ooid = &cb->last_kept_oid;
- if ((*cb->should_prune_fn)(ooid->hash, noid->hash, email, timestamp, tz,
+ if ((*cb->should_prune_fn)(ooid, noid, email, timestamp, tz,
message, policy_cb)) {
if (!cb->newlog)
printf("would prune %s", message);
printf("prune %s", message);
} else {
if (cb->newlog) {
- fprintf(cb->newlog, "%s %s %s %lu %+05d\t%s",
+ fprintf(cb->newlog, "%s %s %s %"PRItime" %+05d\t%s",
oid_to_hex(ooid), oid_to_hex(noid),
email, timestamp, tz, message);
oidcpy(&cb->last_kept_oid, noid);
int status = 0;
int type;
struct strbuf err = STRBUF_INIT;
+ struct object_id oid;
memset(&cb, 0, sizeof(cb));
cb.flags = flags;
}
}
- (*prepare_fn)(refname, sha1, cb.policy_cb);
+ hashcpy(oid.hash, sha1);
+
+ (*prepare_fn)(refname, &oid, cb.policy_cb);
refs_for_each_reflog_ent(ref_store, refname, expire_reflog_ent, &cb);
(*cleanup_fn)(cb.policy_cb);
"files",
files_ref_store_create,
files_init_db,
- files_transaction_commit,
+ files_transaction_prepare,
+ files_transaction_finish,
+ files_transaction_abort,
files_initial_transaction_commit,
files_pack_refs,