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Merge branch 'jk/delta-islands-with-bitmap-reuse-delta-fix' 

Fix interactions between two recent topics.

* jk/delta-islands-with-bitmap-reuse-delta-fix:
  pack-objects: handle island check for "external" delta base
This commit is contained in:
Junio C Hamano 2018-10-16 16:16:00 +09:00
parent eea5e03a5a 2fa233a554
commit 73b9c6f583
1 changed files with 52 additions and 16 deletions
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68
builtin/pack-objects.c
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@ -1469,6 +1469,57 @@ static void cleanup_preferred_base(void)
done_pbase_paths_num = done_pbase_paths_alloc = 0;
}
/*
* Return 1 iff the object specified by "delta" can be sent
* literally as a delta against the base in "base_sha1". If
* so, then *base_out will point to the entry in our packing
* list, or NULL if we must use the external-base list.
*
* Depth value does not matter - find_deltas() will
* never consider reused delta as the base object to
* deltify other objects against, in order to avoid
* circular deltas.
*/
static int can_reuse_delta(const unsigned char *base_sha1,
struct object_entry *delta,
struct object_entry **base_out)
{
struct object_entry *base;
if (!base_sha1)
return 0;
/*
* First see if we're already sending the base (or it's explicitly in
* our "excluded" list).
*/
base = packlist_find(&to_pack, base_sha1, NULL);
if (base) {
if (!in_same_island(&delta->idx.oid, &base->idx.oid))
return 0;
*base_out = base;
return 1;
}
/*
* Otherwise, reachability bitmaps may tell us if the receiver has it,
* even if it was buried too deep in history to make it into the
* packing list.
*/
if (thin && bitmap_has_sha1_in_uninteresting(bitmap_git, base_sha1)) {
if (use_delta_islands) {
struct object_id base_oid;
hashcpy(base_oid.hash, base_sha1);
if (!in_same_island(&delta->idx.oid, &base_oid))
return 0;
}
*base_out = NULL;
return 1;
}
return 0;
}
static void check_object(struct object_entry *entry)
{
unsigned long canonical_size;
@ -1555,22 +1606,7 @@ static void check_object(struct object_entry *entry)
break;
}
if (base_ref && (
(base_entry = packlist_find(&to_pack, base_ref, NULL)) ||
(thin &&
bitmap_has_sha1_in_uninteresting(bitmap_git, base_ref))) &&
in_same_island(&entry->idx.oid, &base_entry->idx.oid)) {
/*
* If base_ref was set above that means we wish to
* reuse delta data, and either we found that object in
* the list of objects we want to pack, or it's one we
* know the receiver has.
*
* Depth value does not matter - find_deltas() will
* never consider reused delta as the base object to
* deltify other objects against, in order to avoid
* circular deltas.
*/
if (can_reuse_delta(base_ref, entry, &base_entry)) {
oe_set_type(entry, entry->in_pack_type);
SET_SIZE(entry, in_pack_size); /* delta size */
SET_DELTA_SIZE(entry, in_pack_size);