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Merge branch 'bc/push-match-many-refs'

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Pushing to repositories with many refs employed O(m*n) algorithm
where n is the number of refs on the receiving end.

* bc/push-match-many-refs:
  remote.c: avoid O(m*n) behavior in match_push_refs
This commit is contained in:
Junio C Hamano 2013-07-18 12:48:25 -07:00
commit db1a848421
1 changed files with 25 additions and 2 deletions
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27
remote.c
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@ -1302,6 +1302,14 @@ static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***ds
free(sent_tips.tip);
}
static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
{
for ( ; ref; ref = ref->next)
string_list_append_nodup(ref_index, ref->name)->util = ref;
sort_string_list(ref_index);
}
/*
* Given the set of refs the local repository has, the set of refs the
* remote repository has, and the refspec used for push, determine
@ -1320,6 +1328,7 @@ int match_push_refs(struct ref *src, struct ref **dst,
int errs;
static const char *default_refspec[] = { ":", NULL };
struct ref *ref, **dst_tail = tail_ref(dst);
struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
if (!nr_refspec) {
nr_refspec = 1;
@ -1330,6 +1339,7 @@ int match_push_refs(struct ref *src, struct ref **dst,
/* pick the remainder */
for (ref = src; ref; ref = ref->next) {
struct string_list_item *dst_item;
struct ref *dst_peer;
const struct refspec *pat = NULL;
char *dst_name;
@ -1338,7 +1348,11 @@ int match_push_refs(struct ref *src, struct ref **dst,
if (!dst_name)
continue;
dst_peer = find_ref_by_name(*dst, dst_name);
if (!dst_ref_index.nr)
prepare_ref_index(&dst_ref_index, *dst);
dst_item = string_list_lookup(&dst_ref_index, dst_name);
dst_peer = dst_item ? dst_item->util : NULL;
if (dst_peer) {
if (dst_peer->peer_ref)
/* We're already sending something to this ref. */
@ -1355,6 +1369,8 @@ int match_push_refs(struct ref *src, struct ref **dst,
/* Create a new one and link it */
dst_peer = make_linked_ref(dst_name, &dst_tail);
hashcpy(dst_peer->new_sha1, ref->new_sha1);
string_list_insert(&dst_ref_index,
dst_peer->name)->util = dst_peer;
}
dst_peer->peer_ref = copy_ref(ref);
dst_peer->force = pat->force;
@ -1362,10 +1378,13 @@ int match_push_refs(struct ref *src, struct ref **dst,
free(dst_name);
}
string_list_clear(&dst_ref_index, 0);
if (flags & MATCH_REFS_FOLLOW_TAGS)
add_missing_tags(src, dst, &dst_tail);
if (send_prune) {
struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
/* check for missing refs on the remote */
for (ref = *dst; ref; ref = ref->next) {
char *src_name;
@ -1376,11 +1395,15 @@ int match_push_refs(struct ref *src, struct ref **dst,
src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
if (src_name) {
if (!find_ref_by_name(src, src_name))
if (!src_ref_index.nr)
prepare_ref_index(&src_ref_index, src);
if (!string_list_has_string(&src_ref_index,
src_name))
ref->peer_ref = alloc_delete_ref();
free(src_name);
}
}
string_list_clear(&src_ref_index, 0);
}
if (errs)
return -1;