Update 'git write-tree' to allow using the sparse-index in memory
without expanding to a full one.
The recursive algorithm for update_one() was already updated in 2de37c5
(cache-tree: integrate with sparse directory entries, 2021-03-03) to
handle sparse directory entries in the index. Hence we can just set the
requires-full-index to false for "write-tree".
The `p2000` tests demonstrate a ~96% execution time reduction for 'git
write-tree' using a sparse index:
Test before after
-----------------------------------------------------------------
2000.78: git write-tree (full-v3) 0.34 0.33 -2.9%
2000.79: git write-tree (full-v4) 0.32 0.30 -6.3%
2000.80: git write-tree (sparse-v3) 0.47 0.02 -95.8%
2000.81: git write-tree (sparse-v4) 0.45 0.02 -95.6%
Signed-off-by: Shuqi Liang <cheskaqiqi@xxxxxxxxx>
---
* Modified the code to ensure prepare_repo_settings() is called only
when inside a repository.
* Change 'write-tree on all' to just 'write-tree'.
* Have a baseline 'test_all_match git write-tree' before making any
changes to the index.
* Add 'git status --porcelain=v2'.
* Ensuring that SKIP_WORKTREE files weren't materialized on disk by
using "test_path_is_missing".
* Use 'test_all_match' on the 'git update-index'.
builtin/write-tree.c | 9 ++++++---
t/t1092-sparse-checkout-compatibility.sh | 20 +++++++++++++++-----
2 files changed, 21 insertions(+), 8 deletions(-)
diff --git a/builtin/write-tree.c b/builtin/write-tree.c
index 32e302a813..a9d5c20cde 100644
--- a/builtin/write-tree.c
+++ b/builtin/write-tree.c
@@ -38,12 +38,15 @@ int cmd_write_tree(int argc, const char **argv, const char *cmd_prefix)
};
git_config(git_default_config, NULL);
+
+ if (the_repository->gitdir) {
+ prepare_repo_settings(the_repository);
+ the_repository->settings.command_requires_full_index = 0;
+ }
+
argc = parse_options(argc, argv, cmd_prefix, write_tree_options,
write_tree_usage, 0);
- prepare_repo_settings(the_repository);
- the_repository->settings.command_requires_full_index = 0;
-
ret = write_index_as_tree(&oid, &the_index, get_index_file(), flags,
tree_prefix);
switch (ret) {
diff --git a/t/t1092-sparse-checkout-compatibility.sh b/t/t1092-sparse-checkout-compatibility.sh
index 9bbc0d646b..d3eb31326b 100755
--- a/t/t1092-sparse-checkout-compatibility.sh
+++ b/t/t1092-sparse-checkout-compatibility.sh
@@ -2055,22 +2055,32 @@ test_expect_success 'grep sparse directory within submodules' '
test_cmp actual expect
'
-test_expect_success 'write-tree on all' '
+test_expect_success 'write-tree' '
init_repos &&
+ test_all_match git write-tree &&
+
write_script edit-contents <<-\EOF &&
echo text >>"$1"
EOF
+ # make a change inside the sparse cone
run_on_all ../edit-contents deep/a &&
- run_on_all git update-index deep/a &&
+ test_all_match git update-index deep/a &&
test_all_match git write-tree &&
+ test_all_match git status --porcelain=v2 &&
+ # make a change outside the sparse cone
run_on_all mkdir -p folder1 &&
run_on_all cp a folder1/a &&
run_on_all ../edit-contents folder1/a &&
- run_on_all git update-index folder1/a &&
- test_all_match git write-tree
+ test_all_match git update-index folder1/a &&
+ test_all_match git write-tree &&
+ test_all_match git status --porcelain=v2 &&
+
+ # check that SKIP_WORKTREE files are not materialized
+ test_path_is_missing sparse-checkout/folder2/a &&
+ test_path_is_missing sparse-index/folder2/a
'
test_expect_success 'sparse-index is not expanded: write-tree' '
@@ -2080,7 +2090,7 @@ test_expect_success 'sparse-index is not expanded: write-tree' '
echo "test1" >>sparse-index/a &&
git -C sparse-index update-index a &&
- ensure_not_expanded write-tree
+ ensure_not_expanded write-tree
'
test_done
--
2.39.0
