[PATCH v3 4/6] read-cache: set sparsity when index is new
- From
Victoria Dye via GitGitGadget <gitgitgadget@gmail.com>
- Date
- May 10, 2022, 23:32 UTC
- Message-ID
- <bb092c075f499acd5aa86debee0a23fa66ac523d.1652225552.git.gitgitgadget@gmail.com>
- In-Reply-To
- <pull.1171.v3.git.1652225552.gitgitgadget@gmail.com>
From: Victoria Dye <vdye@github.com>
When the index read in 'do_read_index()' does not exist on-disk, mark the index "sparse" if the executing command does not require a full index and sparse index is otherwise enabled.
Some commands (such as 'git stash -u') implicitly create a new index (when the 'GIT_INDEX_FILE' variable points to a non-existent file) and perform some operation on it. However, when this index is created, it isn't created with the same sparsity settings as the repo index. As a result, while these indexes may be sparse during the operation, they are always expanded before being written to disk. We can avoid that expansion by defaulting the index to "sparse", in which case it will only be expanded if the full index is needed.
Note that the function 'set_new_index_sparsity()' is created despite having only a single caller because additional callers will be added in a subsequent patch.
Signed-off-by: Victoria Dye <vdye@github.com> --- read-cache.c | 18 +++++++++++++++++- t/t1092-sparse-checkout-compatibility.sh | 2 +- 2 files changed, 18 insertions(+), 2 deletions(-)
diff --git a/read-cache.c b/read-cache.c index 4df97e185e9..60355f5ad6a 100644 --- a/read-cache.c +++ b/read-cache.c @@ -2260,6 +2260,20 @@ static unsigned long load_cache_entries_threaded(struct index_state *istate, con return consumed; } +static void set_new_index_sparsity(struct index_state *istate) +{ + /* + * If the index's repo exists, mark it sparse according to + * repo settings. + */ + if (istate->repo) { + prepare_repo_settings(istate->repo); + if (!istate->repo->settings.command_requires_full_index && + is_sparse_index_allowed(istate, 0)) + istate->sparse_index = 1; + } +} + /* remember to discard_cache() before reading a different cache! */ int do_read_index(struct index_state *istate, const char *path, int must_exist) { @@ -2281,8 +2295,10 @@ int do_read_index(struct index_state *istate, const char *path, int must_exist) istate->timestamp.nsec = 0; fd = open(path, O_RDONLY); if (fd < 0) { - if (!must_exist && errno == ENOENT) + if (!must_exist && errno == ENOENT) { + set_new_index_sparsity(istate); return 0; + } die_errno(_("%s: index file open failed"), path); } diff --git a/t/t1092-sparse-checkout-compatibility.sh b/t/t1092-sparse-checkout-compatibility.sh index 75d844cd71d..85c6a56f1b7 100755 --- a/t/t1092-sparse-checkout-compatibility.sh +++ b/t/t1092-sparse-checkout-compatibility.sh @@ -1389,7 +1389,7 @@ test_expect_success 'sparse-index is not expanded: stash' ' ensure_not_expanded stash drop stash@{0} && echo >>sparse-index/deep/new && - ! ensure_not_expanded stash -u && + ensure_not_expanded stash -u && ( WITHOUT_UNTRACKED_TXT=1 && ! ensure_not_expanded stash pop
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