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pack-objects: introduce pack.allowPackReuse

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Let's make it possible to configure if we want pack reuse or not.

The main reason it might not be wanted is probably debugging and
performance testing, though pack reuse _might_ cause larger packs,
because we wouldn't consider the reused objects as bases for
finding new deltas.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2019-12-18 12:25:43 +01:00 committed by Junio C Hamano
parent 2f4af77699
commit e704fc7978
2 changed files with 14 additions and 1 deletions
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7
Documentation/config/pack.txt
View file

@ -27,6 +27,13 @@ Note that changing the compression level will not automatically recompress
all existing objects. You can force recompression by passing the -F option
to linkgit:git-repack[1].
pack.allowPackReuse::
When true, and when reachability bitmaps are enabled,
pack-objects will try to send parts of the bitmapped packfile
verbatim. This can reduce memory and CPU usage to serve fetches,
but might result in sending a slightly larger pack. Defaults to
true.
pack.island::
An extended regular expression configuring a set of delta
islands. See "DELTA ISLANDS" in linkgit:git-pack-objects[1]

8
builtin/pack-objects.c
View file

@ -96,6 +96,7 @@ static off_t reuse_packfile_offset;
static int use_bitmap_index_default = 1;
static int use_bitmap_index = -1;
static int allow_pack_reuse = 1;
static enum {
WRITE_BITMAP_FALSE = 0,
WRITE_BITMAP_QUIET,
@ -2715,6 +2716,10 @@ static int git_pack_config(const char *k, const char *v, void *cb)
use_bitmap_index_default = git_config_bool(k, v);
return 0;
}
if (!strcmp(k, "pack.allowpackreuse")) {
allow_pack_reuse = git_config_bool(k, v);
return 0;
}
if (!strcmp(k, "pack.usesparse")) {
sparse = git_config_bool(k, v);
return 0;
@ -3050,7 +3055,8 @@ static void loosen_unused_packed_objects(void)
*/
static int pack_options_allow_reuse(void)
{
return pack_to_stdout &&
return allow_pack_reuse &&
pack_to_stdout &&
allow_ofs_delta &&
!ignore_packed_keep_on_disk &&
!ignore_packed_keep_in_core &&