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>
---
* change the position of "settings.command_requires_full_index = 0"
Range-diff against v1:
1: d8a9ccd0b3 ! 1: 8873c79759 write-tree: integrate with sparse index
@@ Commit message
## builtin/write-tree.c ##
@@ builtin/write-tree.c: int cmd_write_tree(int argc, const char **argv, const char *cmd_prefix)
- };
-
- git_config(git_default_config, NULL);
-+
-+ 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_cache_as_tree(&oid, flags, tree_prefix);
+ switch (ret) {
+ case 0:
## t/perf/p2000-sparse-operations.sh ##
@@ t/perf/p2000-sparse-operations.sh: test_perf_on_all git checkout-index -f --all
builtin/write-tree.c | 3 +++
t/perf/p2000-sparse-operations.sh | 1 +
t/t1092-sparse-checkout-compatibility.sh | 28 ++++++++++++++++++++++++
3 files changed, 32 insertions(+)
diff --git a/builtin/write-tree.c b/builtin/write-tree.c
index 45d61707e7..4492da0912 100644
--- a/builtin/write-tree.c
+++ b/builtin/write-tree.c
@@ -38,6 +38,9 @@ int cmd_write_tree(int argc, const char **argv, const char *cmd_prefix)
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_cache_as_tree(&oid, flags, tree_prefix);
switch (ret) {
case 0:
diff --git a/t/perf/p2000-sparse-operations.sh b/t/perf/p2000-sparse-operations.sh
index 3242cfe91a..9924adfc26 100755
--- a/t/perf/p2000-sparse-operations.sh
+++ b/t/perf/p2000-sparse-operations.sh
@@ -125,5 +125,6 @@ test_perf_on_all git checkout-index -f --all
test_perf_on_all git update-index --add --remove $SPARSE_CONE/a
test_perf_on_all "git rm -f $SPARSE_CONE/a && git checkout HEAD -- $SPARSE_CONE/a"
test_perf_on_all git grep --cached --sparse bogus -- "f2/f1/f1/*"
+test_perf_on_all git write-tree
test_done
diff --git a/t/t1092-sparse-checkout-compatibility.sh b/t/t1092-sparse-checkout-compatibility.sh
index 801919009e..3b8191b390 100755
--- a/t/t1092-sparse-checkout-compatibility.sh
+++ b/t/t1092-sparse-checkout-compatibility.sh
@@ -2055,4 +2055,32 @@ test_expect_success 'grep sparse directory within submodules' '
test_cmp actual expect
'
+test_expect_success 'write-tree on all' '
+ init_repos &&
+
+ write_script edit-contents <<-\EOF &&
+ echo text >>"$1"
+ EOF
+
+ run_on_all ../edit-contents deep/a &&
+ run_on_all git update-index deep/a &&
+ test_all_match git write-tree &&
+
+ 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_expect_success 'sparse-index is not expanded: write-tree' '
+ init_repos &&
+
+ ensure_not_expanded write-tree &&
+
+ echo "test1" >>sparse-index/a &&
+ git -C sparse-index update-index a &&
+ ensure_not_expanded write-tree
+'
+
test_done
--
2.39.0
