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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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5
midx.h
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@ -1,7 +1,11 @@
#ifndef __MIDX_H__
#define __MIDX_H__
#include "repository.h"
struct multi_pack_index {
struct multi_pack_index *next;
int fd;
const unsigned char *data;
@ -25,6 +29,7 @@ struct multi_pack_index {
};
struct multi_pack_index *load_multi_pack_index(const char *object_dir);
int prepare_multi_pack_index_one(struct repository *r, const char *object_dir);
int write_midx_file(const char *object_dir);