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t7300: add testcase showing unnecessary traversal into ignored directory

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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>
This commit is contained in:
Elijah Newren 2021-05-12 17:28:17 +00:00 committed by Junio C Hamano
parent b338e9f668
commit 2e4e43a691
1 changed files with 23 additions and 0 deletions
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23
t/t7300-clean.sh
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@ -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