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sparse-index: add index.sparse config option 

When enabled, this config option signals that index writes should
attempt to use sparse-directory entries.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee 2021-03-30 13:10:59 +00:00 committed by Junio C Hamano
parent 0938e6ff55
commit 58300f4743
5 changed files with 44 additions and 6 deletions
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5
Documentation/config/index.txt
View File

@ -14,6 +14,11 @@ index.recordOffsetTable::
Defaults to 'true' if index.threads has been explicitly enabled,
'false' otherwise.
index.sparse::
When enabled, write the index using sparse-directory entries. This
has no effect unless `core.sparseCheckout` and
`core.sparseCheckoutCone` are both enabled. Defaults to 'false'.
index.threads::
Specifies the number of threads to spawn when loading the index.
This is meant to reduce index load time on multiprocessor machines.

1
cache.h
View File

@ -1059,6 +1059,7 @@ struct repository_format {
int worktree_config;
int is_bare;
int hash_algo;
int sparse_index;
char *work_tree;
struct string_list unknown_extensions;
struct string_list v1_only_extensions;

7
repo-settings.c
View File

@ -85,4 +85,11 @@ void prepare_repo_settings(struct repository *r)
* removed.
*/
r->settings.command_requires_full_index = 1;
/*
* Initialize this as off.
*/
r->settings.sparse_index = 0;
if (!repo_config_get_bool(r, "index.sparse", &value) && value)
r->settings.sparse_index = 1;
}

3
repository.h
View File

@ -42,7 +42,8 @@ struct repo_settings {
int core_multi_pack_index;
unsigned command_requires_full_index:1;
unsigned command_requires_full_index:1,
sparse_index:1;
};
struct repository {

34
sparse-index.c
View File

@ -102,19 +102,43 @@ static int convert_to_sparse_rec(struct index_state *istate,
return num_converted - start_converted;
}
static int enable_sparse_index(struct repository *repo)
{
const char *config_path = repo_git_path(repo, "config.worktree");
git_config_set_in_file_gently(config_path,
"index.sparse",
"true");
prepare_repo_settings(repo);
repo->settings.sparse_index = 1;
return 0;
}
int convert_to_sparse(struct index_state *istate)
{
if (istate->split_index || istate->sparse_index ||
!core_apply_sparse_checkout || !core_sparse_checkout_cone)
return 0;
if (!istate->repo)
istate->repo = the_repository;
/*
* For now, only create a sparse index with the
* GIT_TEST_SPARSE_INDEX environment variable. We will relax
* this once we have a proper way to opt-in (and later still,
* opt-out).
* The GIT_TEST_SPARSE_INDEX environment variable triggers the
* index.sparse config variable to be on.
*/
if (!git_env_bool("GIT_TEST_SPARSE_INDEX", 0))
if (git_env_bool("GIT_TEST_SPARSE_INDEX", 0)) {
int err = enable_sparse_index(istate->repo);
if (err < 0)
return err;
}
/*
* Only convert to sparse if index.sparse is set.
*/
prepare_repo_settings(istate->repo);
if (!istate->repo->settings.sparse_index)
return 0;
if (!istate->sparse_checkout_patterns) {