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sparse-index: add ensure_correct_sparsity function 

The `ensure_correct_sparsity` function is intended to provide a means of
aligning the in-core index with the sparsity required by the repository
settings and other properties of the index. The function first checks
whether a sparse index is allowed (per repository & sparse checkout pattern
settings). If the sparse index may be used, the index is converted to
sparse; otherwise, it is explicitly expanded with `ensure_full_index`.

Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Victoria Dye <vdye@github.com>
Reviewed-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Victoria Dye 2021-11-23 00:20:32 +00:00 committed by Junio C Hamano
parent 13f69f3082
commit b93fea08d2
2 changed files with 30 additions and 4 deletions
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33
sparse-index.c
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@ -122,17 +122,17 @@ static int index_has_unmerged_entries(struct index_state *istate)
return 0;
}
int convert_to_sparse(struct index_state *istate, int flags)
static int is_sparse_index_allowed(struct index_state *istate, int flags)
{
int test_env;
if (istate->sparse_index || !istate->cache_nr ||
!core_apply_sparse_checkout || !core_sparse_checkout_cone)
if (!core_apply_sparse_checkout || !core_sparse_checkout_cone)
return 0;
if (!istate->repo)
istate->repo = the_repository;
if (!(flags & SPARSE_INDEX_MEMORY_ONLY)) {
int test_env;
/*
* The sparse index is not (yet) integrated with a split index.
*/
@ -168,6 +168,19 @@ int convert_to_sparse(struct index_state *istate, int flags)
if (!istate->sparse_checkout_patterns->use_cone_patterns)
return 0;
return 1;
}
int convert_to_sparse(struct index_state *istate, int flags)
{
/*
* If the index is already sparse, empty, or otherwise
* cannot be converted to sparse, do not convert.
*/
if (istate->sparse_index || !istate->cache_nr ||
!is_sparse_index_allowed(istate, flags))
return 0;
/*
* NEEDSWORK: If we have unmerged entries, then stay full.
* Unmerged entries prevent the cache-tree extension from working.
@ -316,6 +329,18 @@ void ensure_full_index(struct index_state *istate)
trace2_region_leave("index", "ensure_full_index", istate->repo);
}
void ensure_correct_sparsity(struct index_state *istate)
{
/*
* If the index can be sparse, make it sparse. Otherwise,
* ensure the index is full.
*/
if (is_sparse_index_allowed(istate, 0))
convert_to_sparse(istate, 0);
else
ensure_full_index(istate);
}
/*
* This static global helps avoid infinite recursion between
* expand_to_path() and index_file_exists().

1
sparse-index.h
View File

@ -4,6 +4,7 @@
struct index_state;
#define SPARSE_INDEX_MEMORY_ONLY (1 << 0)
int convert_to_sparse(struct index_state *istate, int flags);
void ensure_correct_sparsity(struct index_state *istate);
/*
* Some places in the codebase expect to search for a specific path.