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git-commit-vandalism/t/t5310-pack-bitmaps.sh
Taylor Blau f8b60cf99b pack-bitmap.c: gracefully fallback after opening pack/MIDX 
When opening a MIDX/pack-bitmap, we call open_midx_bitmap_1() or
open_pack_bitmap_1() respectively in a loop over the set of MIDXs/packs.
By design, these functions are supposed to be called over every pack and
MIDX, since only one of them should have a valid bitmap.

Ordinarily we return '0' from these two functions in order to indicate
that we successfully loaded a bitmap To signal that we couldn't load a
bitmap corresponding to the MIDX/pack (either because one doesn't exist,
or because there was an error with loading it), we can return '-1'. In
either case, the callers each enumerate all MIDXs/packs to ensure that
at most one bitmap per-kind is present.

But when we fail to load a bitmap that does exist (for example, loading
a MIDX bitmap without finding a corresponding reverse index), we'll
return -1 but leave the 'midx' field non-NULL. So when we fallback to
loading a pack bitmap, we'll complain that the bitmap we're trying to
populate already is "opened", even though it isn't.

Rectify this by setting the '->pack' and '->midx' field back to NULL as
appropriate. Two tests are added: one to ensure that the MIDX-to-pack
bitmap fallback works, and another to ensure we still complain when
there are multiple pack bitmaps in a repository.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Reviewed-by: Derrick Stolee <dstolee@microsoft.com>
Reviewed-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-01-27 12:07:53 -08:00

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#!/bin/sh
test_description='exercise basic bitmap functionality'
. ./test-lib.sh
. "$TEST_DIRECTORY"/lib-bitmap.sh
# t5310 deals only with single-pack bitmaps, so don't write MIDX bitmaps in
# their place.
GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP=0
objpath () {
echo ".git/objects/$(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" "$2"
}
setup_bitmap_history
test_expect_success 'setup writing bitmaps during repack' '
git config repack.writeBitmaps true
'
test_expect_success 'full repack creates bitmaps' '
GIT_TRACE2_EVENT="$(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 '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 '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 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
>${i%.pack}.keep || return 1
done &&
reusable_pack --honor-pack-keep >empty.pack &&
git index-pack empty.pack &&
git show-index <empty.idx >actual &&
test_must_be_empty actual
'
test_expect_success 'pack reuse respects --local' '
mv .git/objects/pack/* alt.git/objects/pack/ &&
test_when_finished "mv alt.git/objects/pack/* .git/objects/pack/" &&
reusable_pack --local >empty.pack &&
git index-pack empty.pack &&
git show-index <empty.idx >actual &&
test_must_be_empty actual
'
test_expect_success 'pack reuse respects --incremental' '
reusable_pack --incremental >empty.pack &&
git index-pack empty.pack &&
git show-index <empty.idx >actual &&
test_must_be_empty actual
'
test_expect_success 'truncated bitmap fails gracefully (ewah)' '
test_config pack.writebitmaphashcache false &&
git repack -ad &&
git rev-list --use-bitmap-index --count --all >expect &&
bitmap=$(ls .git/objects/pack/*.bitmap) &&
test_when_finished "rm -f $bitmap" &&
test_copy_bytes 256 <$bitmap >$bitmap.tmp &&
mv -f $bitmap.tmp $bitmap &&
git rev-list --use-bitmap-index --count --all >actual 2>stderr &&
test_cmp expect actual &&
test_i18ngrep corrupt.ewah.bitmap stderr
'
test_expect_success 'truncated bitmap fails gracefully (cache)' '
git repack -ad &&
git rev-list --use-bitmap-index --count --all >expect &&
bitmap=$(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 $base
)
'
test_expect_success 'pack.preferBitmapTips' '
git init repo &&
test_when_finished "rm -fr repo" &&
(
cd repo &&
# create enough commits that not all are receive bitmap
# coverage even if they are all at the tip of some reference.
test_commit_bulk --message="%s" 103 &&
git rev-list HEAD >commits.raw &&
sort <commits.raw >commits &&
git log --format="create refs/tags/%s %H" HEAD >refs &&
git update-ref --stdin <refs &&
git repack -adb &&
test-tool bitmap list-commits | sort >bitmaps &&
# remember which commits did not receive bitmaps
comm -13 bitmaps commits >before &&
test_file_not_empty before &&
# mark the commits which did not receive bitmaps as preferred,
# and generate the bitmap again
perl -pe "s{^}{create refs/tags/include/$. }" <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 'complains about multiple pack bitmaps' '
rm -fr repo &&
git init repo &&
test_when_finished "rm -fr repo" &&
(
cd repo &&
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 rev-list --use-bitmap-index HEAD 2>err &&
grep "ignoring extra bitmap file" err
)
'
test_done
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