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|
#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 "../lockfile.h"
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;
/* The metadata from when this packed-refs cache was read */
struct stat_validity validity;
};
/*
* 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;
}
}
/*
* A container for `packed-refs`-related data. It is not (yet) a
* `ref_store`.
*/
struct packed_ref_store {
struct ref_store base;
unsigned int store_flags;
/* The path of the "packed-refs" file: */
char *path;
/*
* A cache of the values read from the `packed-refs` file, if
* it might still be current; otherwise, NULL.
*/
struct packed_ref_cache *cache;
/*
* Lock used for the "packed-refs" file. Note that this (and
* thus the enclosing `packed_ref_store`) must not be freed.
*/
struct lock_file lock;
/*
* Temporary file used when rewriting new contents to the
* "packed-refs" file. Note that this (and thus the enclosing
* `packed_ref_store`) must not be freed.
*/
struct tempfile tempfile;
};
struct ref_store *packed_ref_store_create(const char *path,
unsigned int store_flags)
{
struct packed_ref_store *refs = xcalloc(1, sizeof(*refs));
struct ref_store *ref_store = (struct ref_store *)refs;
base_ref_store_init(ref_store, &refs_be_packed);
refs->store_flags = store_flags;
refs->path = xstrdup(path);
return ref_store;
}
/*
* Die if refs is not the main ref store. caller is used in any
* necessary error messages.
*/
static void packed_assert_main_repository(struct packed_ref_store *refs,
const char *caller)
{
if (refs->store_flags & REF_STORE_MAIN)
return;
die("BUG: operation %s only allowed for main ref store", caller);
}
/*
* Downcast `ref_store` to `packed_ref_store`. Die if `ref_store` is
* not a `packed_ref_store`. Also die if `packed_ref_store` doesn't
* support at least the flags specified in `required_flags`. `caller`
* is used in any necessary error messages.
*/
static struct packed_ref_store *packed_downcast(struct ref_store *ref_store,
unsigned int required_flags,
const char *caller)
{
struct packed_ref_store *refs;
if (ref_store->be != &refs_be_packed)
die("BUG: ref_store is type \"%s\" not \"packed\" in %s",
ref_store->be->name, caller);
refs = (struct packed_ref_store *)ref_store;
if ((refs->store_flags & required_flags) != required_flags)
die("BUG: unallowed operation (%s), requires %x, has %x\n",
caller, required_flags, refs->store_flags);
return refs;
}
static void clear_packed_ref_cache(struct packed_ref_store *refs)
{
if (refs->cache) {
struct packed_ref_cache *cache = refs->cache;
refs->cache = NULL;
release_packed_ref_cache(cache);
}
}
/* The length of a peeled reference line in packed-refs, including EOL: */
#define PEELED_LINE_LENGTH 42
/*
* 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, struct object_id *oid)
{
const char *ref;
if (parse_oid_hex(line->buf, oid, &ref) < 0)
return NULL;
if (!isspace(*ref++))
return NULL;
if (isspace(*ref))
return NULL;
if (line->buf[line->len - 1] != '\n')
return NULL;
line->buf[--line->len] = 0;
return ref;
}
/*
* Read from `packed_refs_file` into a newly-allocated
* `packed_ref_cache` and return it. The return value will already
* have its reference count incremented.
*
* 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 struct packed_ref_cache *read_packed_refs(const char *packed_refs_file)
{
FILE *f;
struct packed_ref_cache *packed_refs = xcalloc(1, sizeof(*packed_refs));
struct ref_entry *last = NULL;
struct strbuf line = STRBUF_INIT;
enum { PEELED_NONE, PEELED_TAGS, PEELED_FULLY } peeled = PEELED_NONE;
struct ref_dir *dir;
acquire_packed_ref_cache(packed_refs);
packed_refs->cache = create_ref_cache(NULL, NULL);
packed_refs->cache->root->flag &= ~REF_INCOMPLETE;
f = fopen(packed_refs_file, "r");
if (!f) {
if (errno == ENOENT) {
/*
* This is OK; it just means that no
* "packed-refs" file has been written yet,
* which is equivalent to it being empty.
*/
return packed_refs;
} else {
die_errno("couldn't read %s", packed_refs_file);
}
}
stat_validity_update(&packed_refs->validity, fileno(f));
dir = get_ref_dir(packed_refs->cache->root);
while (strbuf_getwholeline(&line, f, '\n') != EOF) {
struct object_id oid;
const char *refname;
const char *traits;
if (!line.len || line.buf[line.len - 1] != '\n')
die("unterminated line in %s: %s", packed_refs_file, line.buf);
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, &oid);
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);
oidclr(&oid);
flag |= REF_BAD_NAME | REF_ISBROKEN;
}
last = create_ref_entry(refname, &oid, flag);
if (peeled == PEELED_FULLY ||
(peeled == PEELED_TAGS && starts_with(refname, "refs/tags/")))
last->flag |= REF_KNOWS_PEELED;
add_ref_entry(dir, last);
} else if (last &&
line.buf[0] == '^' &&
line.len == PEELED_LINE_LENGTH &&
line.buf[PEELED_LINE_LENGTH - 1] == '\n' &&
!get_oid_hex(line.buf + 1, &oid)) {
oidcpy(&last->u.value.peeled, &oid);
/*
* Regardless of what the file header said,
* we definitely know the value of *this*
* reference:
*/
last->flag |= REF_KNOWS_PEELED;
} else {
strbuf_setlen(&line, line.len - 1);
die("unexpected line in %s: %s", packed_refs_file, line.buf);
}
}
fclose(f);
strbuf_release(&line);
return packed_refs;
}
/*
* Check that the packed refs cache (if any) still reflects the
* contents of the file. If not, clear the cache.
*/
static void validate_packed_ref_cache(struct packed_ref_store *refs)
{
if (refs->cache &&
!stat_validity_check(&refs->cache->validity, refs->path))
clear_packed_ref_cache(refs);
}
/*
* Get the packed_ref_cache for the specified packed_ref_store,
* creating and populating it if it hasn't been read before or if the
* file has been changed (according to its `validity` field) since it
* was last read. On the other hand, if we hold the lock, then assume
* that the file hasn't been changed out from under us, so skip the
* extra `stat()` call in `stat_validity_check()`.
*/
static struct packed_ref_cache *get_packed_ref_cache(struct packed_ref_store *refs)
{
if (!is_lock_file_locked(&refs->lock))
validate_packed_ref_cache(refs);
if (!refs->cache)
refs->cache = read_packed_refs(refs->path);
return refs->cache;
}
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 packed_ref_store *refs)
{
return get_packed_ref_dir(get_packed_ref_cache(refs));
}
/*
* Add or overwrite a reference in the in-memory packed reference
* cache. This may only be called while the packed-refs file is locked
* (see packed_refs_lock()). To actually write the packed-refs file,
* call commit_packed_refs().
*/
void add_packed_ref(struct ref_store *ref_store,
const char *refname, const struct object_id *oid)
{
struct packed_ref_store *refs =
packed_downcast(ref_store, REF_STORE_WRITE,
"add_packed_ref");
struct ref_dir *packed_refs;
struct ref_entry *packed_entry;
if (!is_lock_file_locked(&refs->lock))
die("BUG: packed refs not locked");
if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
die("Reference has invalid format: '%s'", refname);
packed_refs = get_packed_refs(refs);
packed_entry = find_ref_entry(packed_refs, refname);
if (packed_entry) {
/* Overwrite the existing entry: */
oidcpy(&packed_entry->u.value.oid, oid);
packed_entry->flag = REF_ISPACKED;
oidclr(&packed_entry->u.value.peeled);
} else {
packed_entry = create_ref_entry(refname, oid, REF_ISPACKED);
add_ref_entry(packed_refs, packed_entry);
}
}
/*
* 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 packed_ref_store *refs,
const char *refname)
{
return find_ref_entry(get_packed_refs(refs), refname);
}
static int packed_read_raw_ref(struct ref_store *ref_store,
const char *refname, unsigned char *sha1,
struct strbuf *referent, unsigned int *type)
{
struct packed_ref_store *refs =
packed_downcast(ref_store, REF_STORE_READ, "read_raw_ref");
struct ref_entry *entry;
*type = 0;
entry = get_packed_ref(refs, refname);
if (!entry) {
errno = ENOENT;
return -1;
}
hashcpy(sha1, entry->u.value.oid.hash);
*type = REF_ISPACKED;
return 0;
}
static int packed_peel_ref(struct ref_store *ref_store,
const char *refname, unsigned char *sha1)
{
struct packed_ref_store *refs =
packed_downcast(ref_store, REF_STORE_READ | REF_STORE_ODB,
"peel_ref");
struct ref_entry *r = get_packed_ref(refs, refname);
if (!r || peel_entry(r, 0))
return -1;
hashcpy(sha1, r->u.value.peeled.hash);
return 0;
}
struct packed_ref_iterator {
struct ref_iterator base;
struct packed_ref_cache *cache;
struct ref_iterator *iter0;
unsigned int flags;
};
static int packed_ref_iterator_advance(struct ref_iterator *ref_iterator)
{
struct packed_ref_iterator *iter =
(struct packed_ref_iterator *)ref_iterator;
int ok;
while ((ok = ref_iterator_advance(iter->iter0)) == ITER_OK) {
if (iter->flags & DO_FOR_EACH_PER_WORKTREE_ONLY &&
ref_type(iter->iter0->refname) != REF_TYPE_PER_WORKTREE)
continue;
if (!(iter->flags & DO_FOR_EACH_INCLUDE_BROKEN) &&
!ref_resolves_to_object(iter->iter0->refname,
iter->iter0->oid,
iter->iter0->flags))
continue;
iter->base.refname = iter->iter0->refname;
iter->base.oid = iter->iter0->oid;
iter->base.flags = iter->iter0->flags;
return ITER_OK;
}
iter->iter0 = NULL;
if (ref_iterator_abort(ref_iterator) != ITER_DONE)
ok = ITER_ERROR;
return ok;
}
static int packed_ref_iterator_peel(struct ref_iterator *ref_iterator,
struct object_id *peeled)
{
struct packed_ref_iterator *iter =
(struct packed_ref_iterator *)ref_iterator;
return ref_iterator_peel(iter->iter0, peeled);
}
static int packed_ref_iterator_abort(struct ref_iterator *ref_iterator)
{
struct packed_ref_iterator *iter =
(struct packed_ref_iterator *)ref_iterator;
int ok = ITER_DONE;
if (iter->iter0)
ok = ref_iterator_abort(iter->iter0);
release_packed_ref_cache(iter->cache);
base_ref_iterator_free(ref_iterator);
return ok;
}
static struct ref_iterator_vtable packed_ref_iterator_vtable = {
packed_ref_iterator_advance,
packed_ref_iterator_peel,
packed_ref_iterator_abort
};
static struct ref_iterator *packed_ref_iterator_begin(
struct ref_store *ref_store,
const char *prefix, unsigned int flags)
{
struct packed_ref_store *refs;
struct packed_ref_iterator *iter;
struct ref_iterator *ref_iterator;
unsigned int required_flags = REF_STORE_READ;
if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN))
required_flags |= REF_STORE_ODB;
refs = packed_downcast(ref_store, required_flags, "ref_iterator_begin");
iter = xcalloc(1, sizeof(*iter));
ref_iterator = &iter->base;
base_ref_iterator_init(ref_iterator, &packed_ref_iterator_vtable);
/*
* Note that get_packed_ref_cache() internally checks whether
* the packed-ref cache is up to date with what is on disk,
* and re-reads it if not.
*/
iter->cache = get_packed_ref_cache(refs);
acquire_packed_ref_cache(iter->cache);
iter->iter0 = cache_ref_iterator_begin(iter->cache->cache, prefix, 0);
iter->flags = flags;
return ref_iterator;
}
/*
* 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. On
* error, return a nonzero value and leave errno set at the value left
* by the failing call to `fprintf()`.
*/
static int write_packed_entry(FILE *fh, const char *refname,
const unsigned char *sha1,
const unsigned char *peeled)
{
if (fprintf(fh, "%s %s\n", sha1_to_hex(sha1), refname) < 0 ||
(peeled && fprintf(fh, "^%s\n", sha1_to_hex(peeled)) < 0))
return -1;
return 0;
}
int packed_refs_lock(struct ref_store *ref_store, int flags, struct strbuf *err)
{
struct packed_ref_store *refs =
packed_downcast(ref_store, REF_STORE_WRITE | REF_STORE_MAIN,
"packed_refs_lock");
static int timeout_configured = 0;
static int timeout_value = 1000;
if (!timeout_configured) {
git_config_get_int("core.packedrefstimeout", &timeout_value);
timeout_configured = 1;
}
/*
* Note that we close the lockfile immediately because we
* don't write new content to it, but rather to a separate
* tempfile.
*/
if (hold_lock_file_for_update_timeout(
&refs->lock,
refs->path,
flags, timeout_value) < 0) {
unable_to_lock_message(refs->path, errno, err);
return -1;
}
if (close_lock_file(&refs->lock)) {
strbuf_addf(err, "unable to close %s: %s", refs->path, strerror(errno));
return -1;
}
/*
* Now that we hold the `packed-refs` lock, make sure that our
* cache matches the current version of the file. Normally
* `get_packed_ref_cache()` does that for us, but that
* function assumes that when the file is locked, any existing
* cache is still valid. We've just locked the file, but it
* might have changed the moment *before* we locked it.
*/
validate_packed_ref_cache(refs);
/*
* Now make sure that the packed-refs file as it exists in the
* locked state is loaded into the cache:
*/
get_packed_ref_cache(refs);
return 0;
}
void packed_refs_unlock(struct ref_store *ref_store)
{
struct packed_ref_store *refs = packed_downcast(
ref_store,
REF_STORE_READ | REF_STORE_WRITE,
"packed_refs_unlock");
if (!is_lock_file_locked(&refs->lock))
die("BUG: packed_refs_unlock() called when not locked");
rollback_lock_file(&refs->lock);
}
int packed_refs_is_locked(struct ref_store *ref_store)
{
struct packed_ref_store *refs = packed_downcast(
ref_store,
REF_STORE_READ | REF_STORE_WRITE,
"packed_refs_is_locked");
return is_lock_file_locked(&refs->lock);
}
/*
* 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";
/*
* Write the current version of the packed refs cache from memory to
* disk. The packed-refs file must already be locked for writing (see
* packed_refs_lock()). Return zero on success. On errors, rollback
* the lockfile, write an error message to `err`, and return a nonzero
* value.
*/
int commit_packed_refs(struct ref_store *ref_store, struct strbuf *err)
{
struct packed_ref_store *refs =
packed_downcast(ref_store, REF_STORE_WRITE | REF_STORE_MAIN,
"commit_packed_refs");
struct packed_ref_cache *packed_ref_cache =
get_packed_ref_cache(refs);
int ok;
int ret = -1;
struct strbuf sb = STRBUF_INIT;
FILE *out;
struct ref_iterator *iter;
char *packed_refs_path;
if (!is_lock_file_locked(&refs->lock))
die("BUG: commit_packed_refs() called when unlocked");
/*
* If packed-refs is a symlink, we want to overwrite the
* symlinked-to file, not the symlink itself. Also, put the
* staging file next to it:
*/
packed_refs_path = get_locked_file_path(&refs->lock);
strbuf_addf(&sb, "%s.new", packed_refs_path);
if (create_tempfile(&refs->tempfile, sb.buf) < 0) {
strbuf_addf(err, "unable to create file %s: %s",
sb.buf, strerror(errno));
strbuf_release(&sb);
goto out;
}
strbuf_release(&sb);
out = fdopen_tempfile(&refs->tempfile, "w");
if (!out) {
strbuf_addf(err, "unable to fdopen packed-refs tempfile: %s",
strerror(errno));
goto error;
}
if (fprintf(out, "%s", PACKED_REFS_HEADER) < 0) {
strbuf_addf(err, "error writing to %s: %s",
get_tempfile_path(&refs->tempfile), strerror(errno));
goto error;
}
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);
if (write_packed_entry(out, iter->refname, iter->oid->hash,
peel_error ? NULL : peeled.hash)) {
strbuf_addf(err, "error writing to %s: %s",
get_tempfile_path(&refs->tempfile),
strerror(errno));
ref_iterator_abort(iter);
goto error;
}
}
if (ok != ITER_DONE) {
strbuf_addf(err, "unable to rewrite packed-refs file: "
"error iterating over old contents");
goto error;
}
if (rename_tempfile(&refs->tempfile, packed_refs_path)) {
strbuf_addf(err, "error replacing %s: %s",
refs->path, strerror(errno));
goto out;
}
ret = 0;
goto out;
error:
delete_tempfile(&refs->tempfile);
out:
free(packed_refs_path);
return ret;
}
/*
* 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 packed refs lock
* must be held when calling this function; it will still be held when
* the function returns.
*
* The refs in 'refnames' needn't be sorted. `err` must not be NULL.
*/
int repack_without_refs(struct ref_store *ref_store,
struct string_list *refnames, struct strbuf *err)
{
struct packed_ref_store *refs =
packed_downcast(ref_store, REF_STORE_WRITE | REF_STORE_MAIN,
"repack_without_refs");
struct ref_dir *packed;
struct string_list_item *refname;
int needs_repacking = 0, removed = 0;
packed_assert_main_repository(refs, "repack_without_refs");
assert(err);
if (!is_lock_file_locked(&refs->lock))
die("BUG: repack_without_refs called without holding lock");
/* 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 */
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.
*/
clear_packed_ref_cache(refs);
return 0;
}
/* Write what remains */
return commit_packed_refs(&refs->base, err);
}
static int packed_init_db(struct ref_store *ref_store, struct strbuf *err)
{
/* Nothing to do. */
return 0;
}
static int packed_transaction_prepare(struct ref_store *ref_store,
struct ref_transaction *transaction,
struct strbuf *err)
{
die("BUG: not implemented yet");
}
static int packed_transaction_abort(struct ref_store *ref_store,
struct ref_transaction *transaction,
struct strbuf *err)
{
die("BUG: not implemented yet");
}
static int packed_transaction_finish(struct ref_store *ref_store,
struct ref_transaction *transaction,
struct strbuf *err)
{
die("BUG: not implemented yet");
}
static int packed_initial_transaction_commit(struct ref_store *ref_store,
struct ref_transaction *transaction,
struct strbuf *err)
{
return ref_transaction_commit(transaction, err);
}
static int packed_delete_refs(struct ref_store *ref_store, const char *msg,
struct string_list *refnames, unsigned int flags)
{
die("BUG: not implemented yet");
}
static int packed_pack_refs(struct ref_store *ref_store, unsigned int flags)
{
/*
* Packed refs are already packed. It might be that loose refs
* are packed *into* a packed refs store, but that is done by
* updating the packed references via a transaction.
*/
return 0;
}
static int packed_create_symref(struct ref_store *ref_store,
const char *refname, const char *target,
const char *logmsg)
{
die("BUG: packed reference store does not support symrefs");
}
static int packed_rename_ref(struct ref_store *ref_store,
const char *oldrefname, const char *newrefname,
const char *logmsg)
{
die("BUG: packed reference store does not support renaming references");
}
static struct ref_iterator *packed_reflog_iterator_begin(struct ref_store *ref_store)
{
return empty_ref_iterator_begin();
}
static int packed_for_each_reflog_ent(struct ref_store *ref_store,
const char *refname,
each_reflog_ent_fn fn, void *cb_data)
{
return 0;
}
static int packed_for_each_reflog_ent_reverse(struct ref_store *ref_store,
const char *refname,
each_reflog_ent_fn fn,
void *cb_data)
{
return 0;
}
static int packed_reflog_exists(struct ref_store *ref_store,
const char *refname)
{
return 0;
}
static int packed_create_reflog(struct ref_store *ref_store,
const char *refname, int force_create,
struct strbuf *err)
{
die("BUG: packed reference store does not support reflogs");
}
static int packed_delete_reflog(struct ref_store *ref_store,
const char *refname)
{
return 0;
}
static int packed_reflog_expire(struct ref_store *ref_store,
const char *refname, const unsigned char *sha1,
unsigned int flags,
reflog_expiry_prepare_fn prepare_fn,
reflog_expiry_should_prune_fn should_prune_fn,
reflog_expiry_cleanup_fn cleanup_fn,
void *policy_cb_data)
{
return 0;
}
struct ref_storage_be refs_be_packed = {
NULL,
"packed",
packed_ref_store_create,
packed_init_db,
packed_transaction_prepare,
packed_transaction_finish,
packed_transaction_abort,
packed_initial_transaction_commit,
packed_pack_refs,
packed_peel_ref,
packed_create_symref,
packed_delete_refs,
packed_rename_ref,
packed_ref_iterator_begin,
packed_read_raw_ref,
packed_reflog_iterator_begin,
packed_for_each_reflog_ent,
packed_for_each_reflog_ent_reverse,
packed_reflog_exists,
packed_create_reflog,
packed_delete_reflog,
packed_reflog_expire
};
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