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git/t/t5310-pack-bitmaps.sh
Taylor Blau b0afdce5da pack-bitmap.c: use commit boundary during bitmap traversal 
When reachability bitmap coverage exists in a repository, Git will use a
different (and hopefully faster) traversal to compute revision walks.

Consider a set of positive and negative tips (which we'll refer to with
their standard bitmap parlance by "wants", and "haves"). In order to
figure out what objects exist between the tips, the existing traversal
in `prepare_bitmap_walk()` does something like:

  1. Consider if we can even compute the set of objects with bitmaps,
     and fall back to the usual traversal if we cannot. For example,
     pathspec limiting traversals can't be computed using bitmaps (since
     they don't know which objects are at which paths). The same is true
     of certain kinds of non-trivial object filters.

  2. If we can compute the traversal with bitmaps, partition the
     (dereferenced) tips into two object lists, "haves", and "wants",
     based on whether or not the objects have the UNINTERESTING flag,
     respectively.

  3. Fall back to the ordinary object traversal if either (a) there are
     more than zero haves, none of which are in the bitmapped pack or
     MIDX, or (b) there are no wants.

  4. Construct a reachability bitmap for the "haves" side by walking
     from the revision tips down to any existing bitmaps, OR-ing in any
     bitmaps as they are found.

  5. Then do the same for the "wants" side, stopping at any objects that
     appear in the "haves" bitmap.

  6. Filter the results if any object filter (that can be easily
     computed with bitmaps alone) was given, and then return back to the
     caller.

When there is good bitmap coverage relative to the traversal tips, this
walk is often significantly faster than an ordinary object traversal
because it can visit far fewer objects.

But in certain cases, it can be significantly *slower* than the usual
object traversal. Why? Because we need to compute complete bitmaps on
either side of the walk. If either one (or both) of the sides require
walking many (or all!) objects before they get to an existing bitmap,
the extra bitmap machinery is mostly or all overhead.

One of the benefits, however, is that even if the walk is slower, bitmap
traversals are guaranteed to provide an *exact* answer. Unlike the
traditional object traversal algorithm, which can over-count the results
by not opening trees for older commits, the bitmap walk builds an exact
reachability bitmap for either side, meaning the results are never
over-counted.

But producing non-exact results is OK for our traversal here (both in
the bitmap case and not), as long as the results are over-counted, not
under.

Relaxing the bitmap traversal to allow it to produce over-counted
results gives us the opportunity to make some significant improvements.
Instead of the above, the new algorithm only has to walk from the
*boundary* down to the nearest bitmap, instead of from each of the
UNINTERESTING tips.

The boundary-based approach still has degenerate cases, but we'll show
in a moment that it is often a significant improvement.

The new algorithm works as follows:

  1. Build a (partial) bitmap of the haves side by first OR-ing any
     bitmap(s) that already exist for UNINTERESTING commits between the
     haves and the boundary.

  2. For each commit along the boundary, add it as a fill-in traversal
     tip (where the traversal terminates once an existing bitmap is
     found), and perform fill-in traversal.

  3. Build up a complete bitmap of the wants side as usual, stopping any
     time we intersect the (partial) haves side.

  4. Return the results.

And is more-or-less equivalent to using the *old* algorithm with this
invocation:

    $ git rev-list --objects --use-bitmap-index $WANTS --not \
        $(git rev-list --objects --boundary $WANTS --not $HAVES |
          perl -lne 'print $1 if /^-(.*)/')

The new result performs significantly better in many cases, particularly
when the distance from the boundary commit(s) to an existing bitmap is
shorter than the distance from (all of) the have tips to the nearest
bitmapped commit.

Note that when using the old bitmap traversal algorithm, the results can
be *slower* than without bitmaps! Under the new algorithm, the result is
computed faster with bitmaps than without (at the cost of over-counting
the true number of objects in a similar fashion as the non-bitmap
traversal):

    # (Computing the number of tagged objects not on any branches
    # without bitmaps).
    $ time git rev-list --count --objects --tags --not --branches
    20

    real	0m1.388s
    user	0m1.092s
    sys	0m0.296s

    # (Computing the same query using the old bitmap traversal).
    $ time git rev-list --count --objects --tags --not --branches --use-bitmap-index
    19

    real	0m22.709s
    user	0m21.628s
    sys	0m1.076s

    # (this commit)
    $ time git.compile rev-list --count --objects --tags --not --branches --use-bitmap-index
    19

    real	0m1.518s
    user	0m1.234s
    sys	0m0.284s

The new algorithm is still slower than not using bitmaps at all, but it
is nearly a 15-fold improvement over the existing traversal.

In a more realistic setting (using my local copy of git.git), I can
observe a similar (if more modest) speed-up:

    $ argv="--count --objects --branches --not --tags"
    hyperfine \
      -n 'no bitmaps' "git.compile rev-list $argv" \
      -n 'existing traversal' "git.compile rev-list --use-bitmap-index $argv" \
      -n 'boundary traversal' "git.compile -c pack.useBitmapBoundaryTraversal=true rev-list --use-bitmap-index $argv"
    Benchmark 1: no bitmaps
      Time (mean ± σ):     124.6 ms ±   2.1 ms    [User: 103.7 ms, System: 20.8 ms]
      Range (min … max):   122.6 ms … 133.1 ms    22 runs

    Benchmark 2: existing traversal
      Time (mean ± σ):     368.6 ms ±   3.0 ms    [User: 325.3 ms, System: 43.1 ms]
      Range (min … max):   365.1 ms … 374.8 ms    10 runs

    Benchmark 3: boundary traversal
      Time (mean ± σ):     167.6 ms ±   0.9 ms    [User: 139.5 ms, System: 27.9 ms]
      Range (min … max):   166.1 ms … 169.2 ms    17 runs

    Summary
      'no bitmaps' ran
        1.34 ± 0.02 times faster than 'boundary traversal'
        2.96 ± 0.05 times faster than 'existing traversal'

Here, the new algorithm is also still slower than not using bitmaps, but
represents a more than 2-fold improvement over the existing traversal in
a more modest example.

Since this algorithm was originally written (nearly a year and a half
ago, at the time of writing), the bitmap lookup table shipped, making
the new algorithm's result more competitive. A few other future
directions for improving bitmap traversal times beyond not using bitmaps
at all:

  - Decrease the cost to decompress and OR together many bitmaps
    together (particularly when enumerating the uninteresting side of
    the walk). Here we could explore more efficient bitmap storage
    techniques, like Roaring+Run and/or use SIMD instructions to speed
    up ORing them together.

  - Store pseudo-merge bitmaps, which could allow us to OR together
    fewer "summary" bitmaps (which would also help with the above).

Helped-by: Jeff King <peff@peff.net>
Helped-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-05-08 12:05:55 -07:00

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#!/bin/sh
test_description='exercise basic bitmap functionality'
. ./test-lib.sh
. "$TEST_DIRECTORY"/lib-bitmap.sh
# t5310 deals only with single-pack bitmaps, so don't write MIDX bitmaps in
# their place.
GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP=0
# Likewise, allow individual tests to control whether or not they use
# the boundary-based traversal.
sane_unset GIT_TEST_PACK_USE_BITMAP_BOUNDARY_TRAVERSAL
objpath () {
echo ".git/objects/$(echo "$1" | sed -e 's|\(..\)|\1/|')"
}
# show objects present in pack ($1 should be associated *.idx)
list_packed_objects () {
git show-index <"$1" >object-list &&
cut -d' ' -f2 object-list
}
# has_any pattern-file content-file
# tests whether content-file has any entry from pattern-file with entries being
# whole lines.
has_any () {
grep -Ff "$1" "$2"
}
test_bitmap_cases () {
writeLookupTable=false
for i in "$@"
do
case "$i" in
"pack.writeBitmapLookupTable") writeLookupTable=true;;
esac
done
test_expect_success 'setup test repository' '
rm -fr * .git &&
git init &&
git config pack.writeBitmapLookupTable '"$writeLookupTable"'
'
setup_bitmap_history
test_expect_success 'setup writing bitmaps during repack' '
git config repack.writeBitmaps true
'
test_expect_success 'full repack creates bitmaps' '
GIT_TRACE2_EVENT="$(pwd)/trace" \
git repack -ad &&
ls .git/objects/pack/ | grep bitmap >output &&
test_line_count = 1 output &&
grep "\"key\":\"num_selected_commits\",\"value\":\"106\"" trace &&
grep "\"key\":\"num_maximal_commits\",\"value\":\"107\"" trace
'
basic_bitmap_tests
test_expect_success 'pack-objects respects --local (non-local loose)' '
git init --bare alt.git &&
echo $(pwd)/alt.git/objects >.git/objects/info/alternates &&
echo content1 >file1 &&
# non-local loose object which is not present in bitmapped pack
altblob=$(GIT_DIR=alt.git git hash-object -w file1) &&
# non-local loose object which is also present in bitmapped pack
git cat-file blob $blob | GIT_DIR=alt.git git hash-object -w --stdin &&
git add file1 &&
test_tick &&
git commit -m commit_file1 &&
echo HEAD | git pack-objects --local --stdout --revs >1.pack &&
git index-pack 1.pack &&
list_packed_objects 1.idx >1.objects &&
printf "%s\n" "$altblob" "$blob" >nonlocal-loose &&
! has_any nonlocal-loose 1.objects
'
test_expect_success 'pack-objects respects --honor-pack-keep (local non-bitmapped pack)' '
echo content2 >file2 &&
blob2=$(git hash-object -w file2) &&
git add file2 &&
test_tick &&
git commit -m commit_file2 &&
printf "%s\n" "$blob2" "$bitmaptip" >keepobjects &&
pack2=$(git pack-objects pack2 <keepobjects) &&
mv pack2-$pack2.* .git/objects/pack/ &&
>.git/objects/pack/pack2-$pack2.keep &&
rm $(objpath $blob2) &&
echo HEAD | git pack-objects --honor-pack-keep --stdout --revs >2a.pack &&
git index-pack 2a.pack &&
list_packed_objects 2a.idx >2a.objects &&
! has_any keepobjects 2a.objects
'
test_expect_success 'pack-objects respects --local (non-local pack)' '
mv .git/objects/pack/pack2-$pack2.* alt.git/objects/pack/ &&
echo HEAD | git pack-objects --local --stdout --revs >2b.pack &&
git index-pack 2b.pack &&
list_packed_objects 2b.idx >2b.objects &&
! has_any keepobjects 2b.objects
'
test_expect_success 'pack-objects respects --honor-pack-keep (local bitmapped pack)' '
ls .git/objects/pack/ | grep bitmap >output &&
test_line_count = 1 output &&
packbitmap=$(basename $(cat output) .bitmap) &&
list_packed_objects .git/objects/pack/$packbitmap.idx >packbitmap.objects &&
test_when_finished "rm -f .git/objects/pack/$packbitmap.keep" &&
>.git/objects/pack/$packbitmap.keep &&
echo HEAD | git pack-objects --honor-pack-keep --stdout --revs >3a.pack &&
git index-pack 3a.pack &&
list_packed_objects 3a.idx >3a.objects &&
! has_any packbitmap.objects 3a.objects
'
test_expect_success 'pack-objects respects --local (non-local bitmapped pack)' '
mv .git/objects/pack/$packbitmap.* alt.git/objects/pack/ &&
rm -f .git/objects/pack/multi-pack-index &&
test_when_finished "mv alt.git/objects/pack/$packbitmap.* .git/objects/pack/" &&
echo HEAD | git pack-objects --local --stdout --revs >3b.pack &&
git index-pack 3b.pack &&
list_packed_objects 3b.idx >3b.objects &&
! has_any packbitmap.objects 3b.objects
'
test_expect_success 'pack-objects to file can use bitmap' '
# make sure we still have 1 bitmap index from previous tests
ls .git/objects/pack/ | grep bitmap >output &&
test_line_count = 1 output &&
# verify equivalent packs are generated with/without using bitmap index
packasha1=$(git pack-objects --no-use-bitmap-index --all packa </dev/null) &&
packbsha1=$(git pack-objects --use-bitmap-index --all packb </dev/null) &&
list_packed_objects packa-$packasha1.idx >packa.objects &&
list_packed_objects packb-$packbsha1.idx >packb.objects &&
test_cmp packa.objects packb.objects
'
test_expect_success 'full repack, reusing previous bitmaps' '
git repack -ad &&
ls .git/objects/pack/ | grep bitmap >output &&
test_line_count = 1 output
'
test_expect_success 'fetch (full bitmap)' '
git --git-dir=clone.git fetch origin second:second &&
git rev-parse HEAD >expect &&
git --git-dir=clone.git rev-parse HEAD >actual &&
test_cmp expect actual
'
test_expect_success 'create objects for missing-HAVE tests' '
blob=$(echo "missing have" | git hash-object -w --stdin) &&
tree=$(printf "100644 blob $blob\tfile\n" | git mktree) &&
parent=$(echo parent | git commit-tree $tree) &&
commit=$(echo commit | git commit-tree $tree -p $parent) &&
cat >revs <<-EOF
HEAD
^HEAD^
^$commit
EOF
'
test_expect_success 'pack-objects respects --incremental' '
cat >revs2 <<-EOF &&
HEAD
$commit
EOF
git pack-objects --incremental --stdout --revs <revs2 >4.pack &&
git index-pack 4.pack &&
list_packed_objects 4.idx >4.objects &&
test_line_count = 4 4.objects &&
git rev-list --objects $commit >revlist &&
cut -d" " -f1 revlist |sort >objects &&
test_cmp 4.objects objects
'
test_expect_success 'pack with missing blob' '
rm $(objpath $blob) &&
git pack-objects --stdout --revs <revs >/dev/null
'
test_expect_success 'pack with missing tree' '
rm $(objpath $tree) &&
git pack-objects --stdout --revs <revs >/dev/null
'
test_expect_success 'pack with missing parent' '
rm $(objpath $parent) &&
git pack-objects --stdout --revs <revs >/dev/null
'
test_expect_success JGIT,SHA1 'we can read jgit bitmaps' '
git clone --bare . compat-jgit.git &&
(
cd compat-jgit.git &&
rm -f objects/pack/*.bitmap &&
jgit gc &&
git rev-list --test-bitmap HEAD
)
'
test_expect_success JGIT,SHA1 'jgit can read our bitmaps' '
git clone --bare . compat-us.git &&
(
cd compat-us.git &&
git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
git repack -adb &&
# jgit gc will barf if it does not like our bitmaps
jgit gc
)
'
test_expect_success 'splitting packs does not generate bogus bitmaps' '
test-tool genrandom foo $((1024 * 1024)) >rand &&
git add rand &&
git commit -m "commit with big file" &&
git -c pack.packSizeLimit=500k repack -adb &&
git init --bare no-bitmaps.git &&
git -C no-bitmaps.git fetch .. HEAD
'
test_expect_success 'set up reusable pack' '
rm -f .git/objects/pack/*.keep &&
git repack -adb &&
reusable_pack () {
git for-each-ref --format="%(objectname)" |
git pack-objects --delta-base-offset --revs --stdout "$@"
}
'
test_expect_success 'pack reuse respects --honor-pack-keep' '
test_when_finished "rm -f .git/objects/pack/*.keep" &&
for i in .git/objects/pack/*.pack
do
>${i%.pack}.keep || return 1
done &&
reusable_pack --honor-pack-keep >empty.pack &&
git index-pack empty.pack &&
git show-index <empty.idx >actual &&
test_must_be_empty actual
'
test_expect_success 'pack reuse respects --local' '
mv .git/objects/pack/* alt.git/objects/pack/ &&
test_when_finished "mv alt.git/objects/pack/* .git/objects/pack/" &&
reusable_pack --local >empty.pack &&
git index-pack empty.pack &&
git show-index <empty.idx >actual &&
test_must_be_empty actual
'
test_expect_success 'pack reuse respects --incremental' '
reusable_pack --incremental >empty.pack &&
git index-pack empty.pack &&
git show-index <empty.idx >actual &&
test_must_be_empty actual
'
test_expect_success 'truncated bitmap fails gracefully (ewah)' '
test_config pack.writebitmaphashcache false &&
test_config pack.writebitmaplookuptable false &&
git repack -ad &&
git rev-list --use-bitmap-index --count --all >expect &&
bitmap=$(ls .git/objects/pack/*.bitmap) &&
test_when_finished "rm -f $bitmap" &&
test_copy_bytes 256 <$bitmap >$bitmap.tmp &&
mv -f $bitmap.tmp $bitmap &&
git rev-list --use-bitmap-index --count --all >actual 2>stderr &&
test_cmp expect actual &&
test_i18ngrep corrupt.ewah.bitmap stderr
'
test_expect_success 'truncated bitmap fails gracefully (cache)' '
git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
git repack -ad &&
git rev-list --use-bitmap-index --count --all >expect &&
bitmap=$(ls .git/objects/pack/*.bitmap) &&
test_when_finished "rm -f $bitmap" &&
test_copy_bytes 512 <$bitmap >$bitmap.tmp &&
mv -f $bitmap.tmp $bitmap &&
git rev-list --use-bitmap-index --count --all >actual 2>stderr &&
test_cmp expect actual &&
test_i18ngrep corrupted.bitmap.index stderr
'
# Create a state of history with these properties:
#
# - refs that allow a client to fetch some new history, while sharing some old
# history with the server; we use branches delta-reuse-old and
# delta-reuse-new here
#
# - the new history contains an object that is stored on the server as a delta
# against a base that is in the old history
#
# - the base object is not immediately reachable from the tip of the old
# history; finding it would involve digging down through history we know the
# other side has
#
# This should result in a state where fetching from old->new would not
# traditionally reuse the on-disk delta (because we'd have to dig to realize
# that the client has it), but we will do so if bitmaps can tell us cheaply
# that the other side has it.
test_expect_success 'set up thin delta-reuse parent' '
# This first commit contains the buried base object.
test-tool genrandom delta 16384 >file &&
git add file &&
git commit -m "delta base" &&
base=$(git rev-parse --verify HEAD:file) &&
# These intermediate commits bury the base back in history.
# This becomes the "old" state.
for i in 1 2 3 4 5
do
echo $i >file &&
git commit -am "intermediate $i" || return 1
done &&
git branch delta-reuse-old &&
# And now our new history has a delta against the buried base. Note
# that this must be smaller than the original file, since pack-objects
# prefers to create deltas from smaller objects to larger.
test-tool genrandom delta 16300 >file &&
git commit -am "delta result" &&
delta=$(git rev-parse --verify HEAD:file) &&
git branch delta-reuse-new &&
# Repack with bitmaps and double check that we have the expected delta
# relationship.
git repack -adb &&
have_delta $delta $base
'
# Now we can sanity-check the non-bitmap behavior (that the server is not able
# to reuse the delta). This isn't strictly something we care about, so this
# test could be scrapped in the future. But it makes sure that the next test is
# actually triggering the feature we want.
#
# Note that our tools for working with on-the-wire "thin" packs are limited. So
# we actually perform the fetch, retain the resulting pack, and inspect the
# result.
test_expect_success 'fetch without bitmaps ignores delta against old base' '
test_config pack.usebitmaps false &&
test_when_finished "rm -rf client.git" &&
git init --bare client.git &&
(
cd client.git &&
git config transfer.unpackLimit 1 &&
git fetch .. delta-reuse-old:delta-reuse-old &&
git fetch .. delta-reuse-new:delta-reuse-new &&
have_delta $delta $ZERO_OID
)
'
# And do the same for the bitmap case, where we do expect to find the delta.
test_expect_success 'fetch with bitmaps can reuse old base' '
test_config pack.usebitmaps true &&
test_when_finished "rm -rf client.git" &&
git init --bare client.git &&
(
cd client.git &&
git config transfer.unpackLimit 1 &&
git fetch .. delta-reuse-old:delta-reuse-old &&
git fetch .. delta-reuse-new:delta-reuse-new &&
have_delta $delta $base
)
'
test_expect_success 'pack.preferBitmapTips' '
git init repo &&
test_when_finished "rm -fr repo" &&
(
cd repo &&
git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
# create enough commits that not all are receive bitmap
# coverage even if they are all at the tip of some reference.
test_commit_bulk --message="%s" 103 &&
git rev-list HEAD >commits.raw &&
sort <commits.raw >commits &&
git log --format="create refs/tags/%s %H" HEAD >refs &&
git update-ref --stdin <refs &&
git repack -adb &&
test-tool bitmap list-commits | sort >bitmaps &&
# remember which commits did not receive bitmaps
comm -13 bitmaps commits >before &&
test_file_not_empty before &&
# mark the commits which did not receive bitmaps as preferred,
# and generate the bitmap again
perl -pe "s{^}{create refs/tags/include/$. }" <before |
git update-ref --stdin &&
git -c pack.preferBitmapTips=refs/tags/include repack -adb &&
# finally, check that the commit(s) without bitmap coverage
# are not the same ones as before
test-tool bitmap list-commits | sort >bitmaps &&
comm -13 bitmaps commits >after &&
! test_cmp before after
)
'
test_expect_success 'pack.preferBitmapTips' '
git init repo &&
test_when_finished "rm -rf repo" &&
(
cd repo &&
git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
test_commit_bulk --message="%s" 103 &&
cat >>.git/config <<-\EOF &&
[pack]
preferBitmapTips
EOF
cat >expect <<-\EOF &&
error: missing value for '\''pack.preferbitmaptips'\''
EOF
git repack -adb 2>actual &&
test_cmp expect actual
)
'
test_expect_success 'complains about multiple pack bitmaps' '
rm -fr repo &&
git init repo &&
test_when_finished "rm -fr repo" &&
(
cd repo &&
git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
test_commit base &&
git repack -adb &&
bitmap="$(ls .git/objects/pack/pack-*.bitmap)" &&
mv "$bitmap" "$bitmap.bak" &&
test_commit other &&
git repack -ab &&
mv "$bitmap.bak" "$bitmap" &&
find .git/objects/pack -type f -name "*.pack" >packs &&
find .git/objects/pack -type f -name "*.bitmap" >bitmaps &&
test_line_count = 2 packs &&
test_line_count = 2 bitmaps &&
GIT_TRACE2_EVENT=$(pwd)/trace2.txt git rev-list --use-bitmap-index HEAD &&
grep "opened bitmap" trace2.txt &&
grep "ignoring extra bitmap" trace2.txt
)
'
}
test_bitmap_cases
GIT_TEST_PACK_USE_BITMAP_BOUNDARY_TRAVERSAL=1
export GIT_TEST_PACK_USE_BITMAP_BOUNDARY_TRAVERSAL
test_bitmap_cases
sane_unset GIT_TEST_PACK_USE_BITMAP_BOUNDARY_TRAVERSAL
test_expect_success 'incremental repack fails when bitmaps are requested' '
test_commit more-1 &&
test_must_fail git repack -d 2>err &&
test_i18ngrep "Incremental repacks are incompatible with bitmap" err
'
test_expect_success 'incremental repack can disable bitmaps' '
test_commit more-2 &&
git repack -d --no-write-bitmap-index
'
test_expect_success 'boundary-based traversal is used when requested' '
git repack -a -d --write-bitmap-index &&
for argv in \
"git -c pack.useBitmapBoundaryTraversal=true" \
"git -c feature.experimental=true" \
"GIT_TEST_PACK_USE_BITMAP_BOUNDARY_TRAVERSAL=1 git"
do
eval "GIT_TRACE2_EVENT=1 $argv rev-list --objects \
--use-bitmap-index second..other 2>perf" &&
grep "\"region_enter\".*\"label\":\"haves/boundary\"" perf ||
return 1
done &&
for argv in \
"git -c pack.useBitmapBoundaryTraversal=false" \
"git -c feature.experimental=true -c pack.useBitmapBoundaryTraversal=false" \
"GIT_TEST_PACK_USE_BITMAP_BOUNDARY_TRAVERSAL=0 git -c pack.useBitmapBoundaryTraversal=true" \
"GIT_TEST_PACK_USE_BITMAP_BOUNDARY_TRAVERSAL=0 git -c feature.experimental=true"
do
eval "GIT_TRACE2_EVENT=1 $argv rev-list --objects \
--use-bitmap-index second..other 2>perf" &&
grep "\"region_enter\".*\"label\":\"haves/classic\"" perf ||
return 1
done
'
test_bitmap_cases "pack.writeBitmapLookupTable"
test_expect_success 'verify writing bitmap lookup table when enabled' '
GIT_TRACE2_EVENT="$(pwd)/trace2" \
git repack -ad &&
grep "\"label\":\"writing_lookup_table\"" trace2
'
test_expect_success 'truncated bitmap fails gracefully (lookup table)' '
test_config pack.writebitmaphashcache false &&
git repack -adb &&
git rev-list --use-bitmap-index --count --all >expect &&
bitmap=$(ls .git/objects/pack/*.bitmap) &&
test_when_finished "rm -f $bitmap" &&
test_copy_bytes 512 <$bitmap >$bitmap.tmp &&
mv -f $bitmap.tmp $bitmap &&
git rev-list --use-bitmap-index --count --all >actual 2>stderr &&
test_cmp expect actual &&
test_i18ngrep corrupted.bitmap.index stderr
'
test_done
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