Here is a small replacement for a series that Stolee and I worked on
together to make the behavior of `collect_pack_filenames()` consistent
with the rest of Git's pack liveness rules.

Nothing much has changed since v1, with the exception of removing
unnecessary conversions from 'ls' -> 'find ... | sort'. As always, a
range-diff is included below for convenience.

Thanks in advance for another look.

Derrick Stolee (1):
  builtin/repack.c: only repack `.pack`s that exist

Taylor Blau (1):
  builtin/repack.c: avoid dir traversal in `collect_pack_filenames()`

 builtin/repack.c  | 38 +++++++++++++++-----------------------
 t/t7700-repack.sh | 36 +++++++++++++++++++++++++++++++++++-
 2 files changed, 50 insertions(+), 24 deletions(-)

Range-diff against v1:
1:  f14a88f107 ! 1:  410d2f0165 builtin/repack.c: only repack `.pack`s that exist
    @@ t/t7700-repack.sh: test_expect_success 'repack --keep-pack' '
      		git config pack.window 0 &&
      		P1=$(commit_and_pack 1) &&
      		P2=$(commit_and_pack 2) &&
    - 		P3=$(commit_and_pack 3) &&
    - 		P4=$(commit_and_pack 4) &&
    --		ls .git/objects/pack/*.pack >old-counts &&
    -+		find .git/objects/pack -name "*.pack" -type f | sort >old-counts &&
    - 		test_line_count = 4 old-counts &&
    - 		git repack -a -d --keep-pack $P1 --keep-pack $P4 &&
    --		ls .git/objects/pack/*.pack >new-counts &&
    -+		find .git/objects/pack -name "*.pack" -type f | sort >new-counts &&
    - 		grep -q $P1 new-counts &&
    - 		grep -q $P4 new-counts &&
    - 		test_line_count = 3 new-counts &&
     @@ t/t7700-repack.sh: test_expect_success 'repack --keep-pack' '
      			mv "$from" "$to" || return 1
      		done &&
    @@ t/t7700-repack.sh: test_expect_success 'repack --keep-pack' '
     +		# repacking what we can.
     +		touch .git/objects/pack/pack-does-not-exist.idx &&
     +
    -+		find .git/objects/pack -name "*.pack" -type f | sort >packs.before &&
      		git repack --cruft -d --keep-pack $P1 --keep-pack $P4 &&
    -+		find .git/objects/pack -name "*.pack" -type f | sort >packs.after &&
      
    --		ls .git/objects/pack/*.pack >newer-counts &&
    --		test_cmp new-counts newer-counts &&
    -+		test_cmp packs.before packs.after &&
    - 		git fsck
    + 		ls .git/objects/pack/*.pack >newer-counts &&
    +@@ t/t7700-repack.sh: test_expect_success 'repack --keep-pack' '
      	)
      '
      
    @@ t/t7700-repack.sh: test_expect_success 'repack --keep-pack' '
     +		P2=$(commit_and_pack 2) &&
     +		P3=$(commit_and_pack 3) &&
     +		P4=$(commit_and_pack 4) &&
    -+		find .git/objects/pack -name "*.pack" -type f | sort >old-counts &&
    ++		ls .git/objects/pack/*.pack >old-counts &&
     +		test_line_count = 4 old-counts &&
     +
     +		# Remove one .pack file
     +		rm .git/objects/pack/$P2 &&
     +
    -+		find .git/objects/pack -name "*.pack" -type f |
    -+			sort >before-pack-dir &&
    ++		ls .git/objects/pack/*.pack >before-pack-dir &&
     +
     +		test_must_fail git fsck &&
     +		test_must_fail git repack --cruft -d 2>err &&
    @@ t/t7700-repack.sh: test_expect_success 'repack --keep-pack' '
     +
     +		# Before failing, the repack did not modify the
     +		# pack directory.
    -+		find .git/objects/pack -name "*.pack" -type f |
    -+			sort >after-pack-dir &&
    ++		ls .git/objects/pack/*.pack >after-pack-dir &&
     +		test_cmp before-pack-dir after-pack-dir
     +	)
     +'
2:  b3d0d9308e = 2:  ffdf85f6d3 builtin/repack.c: avoid dir traversal in `collect_pack_filenames()`
-- 
2.41.0.329.gffdf85f6d39