Subject: [PATCH v2 0/2] refs: a couple of --exclude fixes

From: Taylor Blau <[email-masked]>
Date: Thu, 6 Mar 2025 10:34:44 -0500

Here is a small reroll of my series to fix a couple of quirks with the
--exclude pattern matching.

The changes since last time are fairly minor: the second patch's subject
line was reworded (thanks to a suggestion by Patrick). Likewise, its
test script changed slightly to reflect that "refs/heads/ba" and
"refs/heads/bar" are no longer considered overlapping regions.

For convenience, a range-diff is below. Thanks again for your review
:-).

Taylor Blau (2):
  refs.c: remove empty '--exclude' patterns
  refs.c: stop matching non-directory prefixes in exclude patterns

 refs.c                  | 20 ++++++++++++++++++++
 t/t1419-exclude-refs.sh | 26 ++++++++++++++++++++++++--
 2 files changed, 44 insertions(+), 2 deletions(-)

Range-diff against v1:
1:  c3b5ca5973 = 1:  c3b5ca5973 refs.c: remove empty '--exclude' patterns
2:  7e6a5e020b ! 2:  67c8c5f797 refs.c: unify '--exclude' behavior between files and packed backends
    @@ Metadata
     Author: Taylor Blau <[email-masked]>

      ## Commit message ##
    -    refs.c: unify '--exclude' behavior between files and packed backends
    +    refs.c: stop matching non-directory prefixes in exclude patterns

         In the packed-refs backend, our implementation of '--exclude' (dating
         back to 59c35fac54 (refs/packed-backend.c: implement jump lists to avoid
    @@ Commit message

         But that test fallout is expected, because the test was codifying the
         buggy behavior to begin with, and should have never been written that
    -    way.
    +    way. Split that into its own test (since the range is no longer
    +    overlapping under the stricter interpretation of --exclude patterns
    +    presented here). Create a new test which does have overlapping
    +    regions by using a refs/heads/bar/4/... hierarchy and excluding both
    +    "refs/heads/bar" and "refs/heads/bar/4".

         Reported-by: SURA <[email-masked]>
         Helped-by: Jeff King <[email-masked]>
    @@ refs.c: struct ref_iterator *refs_ref_iterator_begin(
      		exclude_patterns = normalized_exclude_patterns.v;

      ## t/t1419-exclude-refs.sh ##
    +@@ t/t1419-exclude-refs.sh: test_expect_success 'setup' '
    + 			echo "create refs/heads/$name/$i $base" || return 1
    + 		done || return 1
    + 	done >in &&
    ++	for i in 5 6 7
    ++	do
    ++		echo "create refs/heads/bar/4/$i $base" || return 1
    ++	done >>in &&
    + 	echo "delete refs/heads/main" >>in &&
    +
    + 	git update-ref --stdin <in &&
     @@ t/t1419-exclude-refs.sh: test_expect_success 'adjacent, non-overlapping excluded regions' '
    + 	esac
    + '

    - test_expect_success 'overlapping excluded regions' '
    +-test_expect_success 'overlapping excluded regions' '
    ++test_expect_success 'non-directory excluded regions' '
      	for_each_ref__exclude refs/heads refs/heads/ba refs/heads/baz >actual 2>perf &&
     -	for_each_ref refs/heads/foo refs/heads/quux >expect &&
     +	for_each_ref refs/heads/bar refs/heads/foo refs/heads/quux >expect &&
    ++
    ++	test_cmp expect actual &&
    ++	assert_jumps 1 perf
    ++'
    ++
    ++test_expect_success 'overlapping excluded regions' '
    ++	for_each_ref__exclude refs/heads refs/heads/bar refs/heads/bar/4 >actual 2>perf &&
    ++	for_each_ref refs/heads/baz refs/heads/foo refs/heads/quux >expect &&

      	test_cmp expect actual &&
      	assert_jumps 1 perf

base-commit: 6a64ac7b014fa2cfa7a69af3c253bcd53a94b428
--
2.49.0.rc1.2.g67c8c5f7978