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midx: enable core.multiPackIndex by default 

The core.multiPackIndex setting has been around since c4d25228eb
(config: create core.multiPackIndex setting, 2018-07-12), but has been
disabled by default. If a user wishes to use the multi-pack-index
feature, then they must enable this config and run 'git multi-pack-index
write'.

The multi-pack-index feature is relatively stable now, so make the
config option true by default. For users that do not use a
multi-pack-index, the only extra cost will be a file lookup to see if a
multi-pack-index file exists (once per process, per object directory).

Also, this config option will be referenced by an upcoming
"incremental-repack" task in the maintenance builtin, so move the config
option into the repository settings struct. Note that if
GIT_TEST_MULTI_PACK_INDEX=1, then we want to ignore the config option
and treat core.multiPackIndex as enabled.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee 2020-09-25 12:33:34 +00:00 committed by Junio C Hamano
parent 3e220e6069
commit 18e449f86b
4 changed files with 13 additions and 10 deletions
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4
Documentation/config/core.txt
View File

@ -606,8 +606,8 @@ core.useReplaceRefs::
core.multiPackIndex::
Use the multi-pack-index file to track multiple packfiles using a
single index. See link:technical/multi-pack-index.html[the
multi-pack-index design document].
single index. See linkgit:git-multi-pack-index[1] for more
information. Defaults to true.
core.sparseCheckout::
Enable "sparse checkout" feature. See linkgit:git-sparse-checkout[1]

11
midx.c
View File

@ -10,6 +10,7 @@
#include "progress.h"
#include "trace2.h"
#include "run-command.h"
#include "repository.h"
#define MIDX_SIGNATURE 0x4d494458 /* "MIDX" */
#define MIDX_VERSION 1
@ -384,15 +385,9 @@ int prepare_multi_pack_index_one(struct repository *r, const char *object_dir, i
{
struct multi_pack_index *m;
struct multi_pack_index *m_search;
int config_value;
static int env_value = -1;
if (env_value < 0)
env_value = git_env_bool(GIT_TEST_MULTI_PACK_INDEX, 0);
if (!env_value &&
(repo_config_get_bool(r, "core.multipackindex", &config_value) ||
!config_value))
prepare_repo_settings(r);
if (!r->settings.core_multi_pack_index)
return 0;
for (m_search = r->objects->multi_pack_index; m_search; m_search = m_search->next)

6
repo-settings.c
View File

@ -1,6 +1,7 @@
#include "cache.h"
#include "config.h"
#include "repository.h"
#include "midx.h"
#define UPDATE_DEFAULT_BOOL(s,v) do { if (s == -1) { s = v; } } while(0)
@ -47,6 +48,11 @@ void prepare_repo_settings(struct repository *r)
r->settings.pack_use_sparse = value;
UPDATE_DEFAULT_BOOL(r->settings.pack_use_sparse, 1);
value = git_env_bool(GIT_TEST_MULTI_PACK_INDEX, 0);
if (value || !repo_config_get_bool(r, "core.multipackindex", &value))
r->settings.core_multi_pack_index = value;
UPDATE_DEFAULT_BOOL(r->settings.core_multi_pack_index, 1);
if (!repo_config_get_bool(r, "feature.manyfiles", &value) && value) {
UPDATE_DEFAULT_BOOL(r->settings.index_version, 4);
UPDATE_DEFAULT_BOOL(r->settings.core_untracked_cache, UNTRACKED_CACHE_WRITE);

2
repository.h
View File

@ -37,6 +37,8 @@ struct repo_settings {
int pack_use_sparse;
enum fetch_negotiation_setting fetch_negotiation_algorithm;
int core_multi_pack_index;
};
struct repository {