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pack_refs(): split creation of packed refs and entry writing 

Split pack_refs() into multiple passes:

* Iterate over loose refs.  For each one that can be turned into a
  packed ref, create a corresponding entry in the packed refs cache.

* Write the packed refs to the packed-refs file.

This change isolates the mutation of the packed-refs file to a single
place.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Michael Haggerty 2013-06-20 10:37:44 +02:00 committed by Junio C Hamano
parent 7b40d39638
commit 267f9a8cc8
1 changed files with 34 additions and 14 deletions
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48
refs.c
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@ -2023,35 +2023,50 @@ struct ref_to_prune {
struct pack_refs_cb_data {
unsigned int flags;
struct ref_dir *packed_refs;
struct ref_to_prune *ref_to_prune;
int fd;
};
static int pack_one_ref(struct ref_entry *entry, void *cb_data)
/*
* 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 = !prefixcmp(entry->name, "refs/tags/");
/* ALWAYS pack refs that were already packed or are tags */
if (!(cb->flags & PACK_REFS_ALL) && !is_tag_ref &&
!(entry->flag & REF_ISPACKED))
/* 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, sha1_to_hex(entry->u.value.sha1));
write_packed_entry(cb->fd, entry->name, entry->u.value.sha1,
peel_status == PEEL_PEELED ?
entry->u.value.peeled : NULL);
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;
hashcpy(packed_entry->u.value.sha1, entry->u.value.sha1);
} else {
packed_entry = create_ref_entry(entry->name, entry->u.value.sha1,
REF_ISPACKED | REF_KNOWS_PEELED, 0);
add_ref(cb->packed_refs, packed_entry);
}
hashcpy(packed_entry->u.value.peeled, entry->u.value.peeled);
/* If the ref was already packed, there is no need to prune it. */
if ((cb->flags & PACK_REFS_PRUNE) && !(entry->flag & REF_ISPACKED)) {
/* 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.sha1);
@ -2118,16 +2133,21 @@ static struct lock_file packlock;
int pack_refs(unsigned int flags)
{
struct pack_refs_cb_data cbdata;
int fd;
memset(&cbdata, 0, sizeof(cbdata));
cbdata.flags = flags;
cbdata.fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"),
LOCK_DIE_ON_ERROR);
fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"),
LOCK_DIE_ON_ERROR);
cbdata.packed_refs = get_packed_refs(&ref_cache);
write_or_die(cbdata.fd, PACKED_REFS_HEADER, strlen(PACKED_REFS_HEADER));
do_for_each_entry_in_dir(get_loose_refs(&ref_cache), 0,
pack_if_possible_fn, &cbdata);
write_or_die(fd, PACKED_REFS_HEADER, strlen(PACKED_REFS_HEADER));
do_for_each_entry_in_dir(cbdata.packed_refs, 0, write_packed_entry_fn, &fd);
do_for_each_entry(&ref_cache, "", pack_one_ref, &cbdata);
if (commit_lock_file(&packlock) < 0)
die_errno("unable to overwrite old ref-pack file");
prune_refs(cbdata.ref_to_prune);