t7300: add testcase showing unnecessary traversal into ignored directory
The PNPM package manager is apparently creating deeply nested (but ignored) directory structures; traversing them is costly performance-wise, unnecessary, and in some cases is even throwing warnings/errors because the paths are too long to handle on various platforms. Add a testcase that checks for such unnecessary directory traversal. Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Elijah Newren committed
May 12, 2021 at 17:28 UTC
2e4e43a6910393d681d095f515d41232c2372966
1 file changed
+23
t/t7300-clean.sh
+23
index a74816ca8b..07e8ba2d4b 100755
--- a/t/t7300-clean.sh
+++ b/t/t7300-clean.sh
@@ -746,4 +746,27 @@ test_expect_success 'clean untracked paths by pathspec' '
test_must_be_empty actual
'
+test_expect_failure 'avoid traversing into ignored directories' '
+ test_when_finished rm -f output error trace.* &&
+ test_create_repo avoid-traversing-deep-hierarchy &&
+ (
+ cd avoid-traversing-deep-hierarchy &&
+
+ mkdir -p untracked/subdir/with/a &&
+ >untracked/subdir/with/a/random-file.txt &&
+
+ GIT_TRACE2_PERF="$TRASH_DIRECTORY/trace.output" \
+ git clean -ffdxn -e untracked
+ ) &&
+
+ # Make sure we only visited into the top-level directory, and did
+ # not traverse into the "untracked" subdirectory since it was excluded
+ grep data.*read_directo.*directories-visited trace.output |
+ cut -d "|" -f 9 >trace.relevant &&
+ cat >trace.expect <<-EOF &&
+ ..directories-visited:1
+ EOF
+ test_cmp trace.expect trace.relevant
+'
+
test_done