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upload-pack: refactor ok_to_give_up()

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In anticipation of consolidating all commit reachability algorithms,
refactor ok_to_give_up() in order to allow splitting its logic into
an external method.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee 2018-07-20 16:33:11 +00:00 committed by Junio C Hamano
parent f044bb49ad
commit 921bf7734f
1 changed files with 23 additions and 11 deletions
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34
upload-pack.c
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@ -369,34 +369,46 @@ static int reachable(struct commit *from, unsigned int with_flag,
return (from->object.flags & assign_flag);
}
static int ok_to_give_up(void)
/*
* Determine if every commit in 'from' can reach at least one commit
* that is marked with 'with_flag'. As we traverse, use 'assign_flag'
* as a marker for commits that are already visited.
*/
static int can_all_from_reach_with_flag(struct object_array *from,
unsigned int with_flag,
unsigned int assign_flag)
{
int i;
if (!have_obj.nr)
return 0;
for (i = 0; i < from->nr; i++) {
struct object *from_one = from->objects[i].item;
for (i = 0; i < want_obj.nr; i++) {
struct object *want = want_obj.objects[i].item;
if (want->flags & COMMON_KNOWN)
if (from_one->flags & assign_flag)
continue;
want = deref_tag(the_repository, want, "a want line", 0);
if (!want || want->type != OBJ_COMMIT) {
from_one = deref_tag(the_repository, from_one, "a from object", 0);
if (!from_one || from_one->type != OBJ_COMMIT) {
/* no way to tell if this is reachable by
* looking at the ancestry chain alone, so
* leave a note to ourselves not to worry about
* this object anymore.
*/
want_obj.objects[i].item->flags |= COMMON_KNOWN;
from->objects[i].item->flags |= assign_flag;
continue;
}
if (!reachable((struct commit *)want, THEY_HAVE, COMMON_KNOWN))
if (!reachable((struct commit *)from_one, with_flag, assign_flag))
return 0;
}
return 1;
}
static int ok_to_give_up(void)
{
if (!have_obj.nr)
return 0;
return can_all_from_reach_with_flag(&want_obj, THEY_HAVE, COMMON_KNOWN);
}
static int get_common_commits(void)
{
struct object_id oid;