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config: create core.multiPackIndex setting

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The core.multiPackIndex config setting controls the multi-pack-
index (MIDX) feature. If false, the setting will disable all reads
from the multi-pack-index file.

Read this config setting in the new prepare_multi_pack_index_one()
which is called during prepare_packed_git(). This check is run once
per repository.

Add comparison commands in t5319-multi-pack-index.sh to check
typical Git behavior remains the same as the config setting is turned
on and off. This currently includes 'git rev-list' and 'git log'
commands to trigger several object database reads. Currently, these
would only catch an error in the prepare_multi_pack_index_one(), but
with later commits will catch errors in object lookups, abbreviations,
and approximate object counts.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee
2018-07-12 15:39:33 -04:00
committed by Junio C Hamano
parent 662148c435
commit c4d25228eb
6 changed files with 85 additions and 14 deletions
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6
packfile.c
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@ -15,6 +15,7 @@
#include "tree-walk.h"
#include "tree.h"
#include "object-store.h"
#include "midx.h"
char *odb_pack_name(struct strbuf *buf,
const unsigned char *sha1,
@ -935,10 +936,13 @@ static void prepare_packed_git(struct repository *r)
if (r->objects->packed_git_initialized)
return;
prepare_multi_pack_index_one(r, r->objects->objectdir);
prepare_packed_git_one(r, r->objects->objectdir, 1);
prepare_alt_odb(r);
for (alt = r->objects->alt_odb_list; alt; alt = alt->next)
for (alt = r->objects->alt_odb_list; alt; alt = alt->next) {
prepare_multi_pack_index_one(r, alt->path);
prepare_packed_git_one(r, alt->path, 0);
}
rearrange_packed_git(r);
prepare_packed_git_mru(r);
r->objects->packed_git_initialized = 1;