git-commit-vandalism/t/t5326-multi-pack-bitmaps.sh
Taylor Blau 61fd31a179 t5326: demonstrate bitmap corruption after permutation
This patch demonstrates a cause of bitmap corruption that can occur when
the contents of the multi-pack index does not change, but the underlying
object order does.

In this example, we have a MIDX containing two packs, each with a
distinct set of objects (pack A corresponds to the tree, blob, and
commit from the first patch, and pack B corresponds to the second
patch).

First, a MIDX is written where the 'A' pack is preferred. As expected,
the bitmaps generated there are in-tact. But then, we generate an
identical MIDX with a different object order: this time preferring pack
'B'.

Due to a bug which will be explained and fixed in the following commit,
the MIDX is updated, but the .rev file is not, causing the .bitmap file
to be read incorrectly. Specifically, the .bitmap file will contain
correct data, but the auxiliary object order in the .rev file is stale,
causing readers to get confused by reading the new bitmaps using the old
object order.

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 12:07:52 -08:00

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#!/bin/sh
test_description='exercise basic multi-pack bitmap functionality'
. ./test-lib.sh
. "${TEST_DIRECTORY}/lib-bitmap.sh"
# We'll be writing our own midx and bitmaps, so avoid getting confused by the
# automatic ones.
GIT_TEST_MULTI_PACK_INDEX=0
GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP=0
objdir=.git/objects
midx=$objdir/pack/multi-pack-index
# midx_pack_source <obj>
midx_pack_source () {
test-tool read-midx --show-objects .git/objects | grep "^$1 " | cut -f2
}
setup_bitmap_history
test_expect_success 'enable core.multiPackIndex' '
git config core.multiPackIndex true
'
test_expect_success 'create single-pack midx with bitmaps' '
git repack -ad &&
git multi-pack-index write --bitmap &&
test_path_is_file $midx &&
test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
test_path_is_file $midx-$(midx_checksum $objdir).rev
'
basic_bitmap_tests
test_expect_success 'create new additional packs' '
for i in $(test_seq 1 16)
do
test_commit "$i" &&
git repack -d || return 1
done &&
git checkout -b other2 HEAD~8 &&
for i in $(test_seq 1 8)
do
test_commit "side-$i" &&
git repack -d || return 1
done &&
git checkout second
'
test_expect_success 'create multi-pack midx with bitmaps' '
git multi-pack-index write --bitmap &&
ls $objdir/pack/pack-*.pack >packs &&
test_line_count = 25 packs &&
test_path_is_file $midx &&
test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
test_path_is_file $midx-$(midx_checksum $objdir).rev
'
basic_bitmap_tests
test_expect_success '--no-bitmap is respected when bitmaps exist' '
git multi-pack-index write --bitmap &&
test_commit respect--no-bitmap &&
git repack -d &&
test_path_is_file $midx &&
test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
test_path_is_file $midx-$(midx_checksum $objdir).rev &&
git multi-pack-index write --no-bitmap &&
test_path_is_file $midx &&
test_path_is_missing $midx-$(midx_checksum $objdir).bitmap &&
test_path_is_missing $midx-$(midx_checksum $objdir).rev
'
test_expect_success 'setup midx with base from later pack' '
# Write a and b so that "a" is a delta on top of base "b", since Git
# prefers to delete contents out of a base rather than add to a shorter
# object.
test_seq 1 128 >a &&
test_seq 1 130 >b &&
git add a b &&
git commit -m "initial commit" &&
a=$(git rev-parse HEAD:a) &&
b=$(git rev-parse HEAD:b) &&
# In the first pack, "a" is stored as a delta to "b".
p1=$(git pack-objects .git/objects/pack/pack <<-EOF
$a
$b
EOF
) &&
# In the second pack, "a" is missing, and "b" is not a delta nor base to
# any other object.
p2=$(git pack-objects .git/objects/pack/pack <<-EOF
$b
$(git rev-parse HEAD)
$(git rev-parse HEAD^{tree})
EOF
) &&
git prune-packed &&
# Use the second pack as the preferred source, so that "b" occurs
# earlier in the MIDX object order, rendering "a" unusable for pack
# reuse.
git multi-pack-index write --bitmap --preferred-pack=pack-$p2.idx &&
have_delta $a $b &&
test $(midx_pack_source $a) != $(midx_pack_source $b)
'
rev_list_tests 'full bitmap with backwards delta'
test_expect_success 'clone with bitmaps enabled' '
git clone --no-local --bare . clone-reverse-delta.git &&
test_when_finished "rm -fr clone-reverse-delta.git" &&
git rev-parse HEAD >expect &&
git --git-dir=clone-reverse-delta.git rev-parse HEAD >actual &&
test_cmp expect actual
'
bitmap_reuse_tests() {
from=$1
to=$2
test_expect_success "setup pack reuse tests ($from -> $to)" '
rm -fr repo &&
git init repo &&
(
cd repo &&
test_commit_bulk 16 &&
git tag old-tip &&
git config core.multiPackIndex true &&
if test "MIDX" = "$from"
then
git repack -Ad &&
git multi-pack-index write --bitmap
else
git repack -Adb
fi
)
'
test_expect_success "build bitmap from existing ($from -> $to)" '
(
cd repo &&
test_commit_bulk --id=further 16 &&
git tag new-tip &&
if test "MIDX" = "$to"
then
git repack -d &&
git multi-pack-index write --bitmap
else
git repack -Adb
fi
)
'
test_expect_success "verify resulting bitmaps ($from -> $to)" '
(
cd repo &&
git for-each-ref &&
git rev-list --test-bitmap refs/tags/old-tip &&
git rev-list --test-bitmap refs/tags/new-tip
)
'
}
bitmap_reuse_tests 'pack' 'MIDX'
bitmap_reuse_tests 'MIDX' 'pack'
bitmap_reuse_tests 'MIDX' 'MIDX'
test_expect_success 'missing object closure fails gracefully' '
rm -fr repo &&
git init repo &&
test_when_finished "rm -fr repo" &&
(
cd repo &&
test_commit loose &&
test_commit packed &&
# Do not pass "--revs"; we want a pack without the "loose"
# commit.
git pack-objects $objdir/pack/pack <<-EOF &&
$(git rev-parse packed)
EOF
test_must_fail git multi-pack-index write --bitmap 2>err &&
grep "doesn.t have full closure" err &&
test_path_is_missing $midx
)
'
test_expect_success 'setup partial bitmaps' '
test_commit packed &&
git repack &&
test_commit loose &&
git multi-pack-index write --bitmap 2>err &&
test_path_is_file $midx &&
test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
test_path_is_file $midx-$(midx_checksum $objdir).rev
'
basic_bitmap_tests HEAD~
test_expect_success 'removing a MIDX clears stale bitmaps' '
rm -fr repo &&
git init repo &&
test_when_finished "rm -fr repo" &&
(
cd repo &&
test_commit base &&
git repack &&
git multi-pack-index write --bitmap &&
# Write a MIDX and bitmap; remove the MIDX but leave the bitmap.
stale_bitmap=$midx-$(midx_checksum $objdir).bitmap &&
stale_rev=$midx-$(midx_checksum $objdir).rev &&
rm $midx &&
# Then write a new MIDX.
test_commit new &&
git repack &&
git multi-pack-index write --bitmap &&
test_path_is_file $midx &&
test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
test_path_is_file $midx-$(midx_checksum $objdir).rev &&
test_path_is_missing $stale_bitmap &&
test_path_is_missing $stale_rev
)
'
test_expect_success 'pack.preferBitmapTips' '
git init repo &&
test_when_finished "rm -fr repo" &&
(
cd repo &&
test_commit_bulk --message="%s" 103 &&
git log --format="%H" >commits.raw &&
sort <commits.raw >commits &&
git log --format="create refs/tags/%s %H" HEAD >refs &&
git update-ref --stdin <refs &&
git multi-pack-index write --bitmap &&
test_path_is_file $midx &&
test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
test_path_is_file $midx-$(midx_checksum $objdir).rev &&
test-tool bitmap list-commits | sort >bitmaps &&
comm -13 bitmaps commits >before &&
test_line_count = 1 before &&
perl -ne "printf(\"create refs/tags/include/%d \", $.); print" \
<before | git update-ref --stdin &&
rm -fr $midx-$(midx_checksum $objdir).bitmap &&
rm -fr $midx-$(midx_checksum $objdir).rev &&
rm -fr $midx &&
git -c pack.preferBitmapTips=refs/tags/include \
multi-pack-index write --bitmap &&
test-tool bitmap list-commits | sort >bitmaps &&
comm -13 bitmaps commits >after &&
! test_cmp before after
)
'
test_expect_success 'writing a bitmap with --refs-snapshot' '
git init repo &&
test_when_finished "rm -fr repo" &&
(
cd repo &&
test_commit one &&
test_commit two &&
git rev-parse one >snapshot &&
git repack -ad &&
# First, write a MIDX which see both refs/tags/one and
# refs/tags/two (causing both of those commits to receive
# bitmaps).
git multi-pack-index write --bitmap &&
test_path_is_file $midx &&
test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
test-tool bitmap list-commits | sort >bitmaps &&
grep "$(git rev-parse one)" bitmaps &&
grep "$(git rev-parse two)" bitmaps &&
rm -fr $midx-$(midx_checksum $objdir).bitmap &&
rm -fr $midx-$(midx_checksum $objdir).rev &&
rm -fr $midx &&
# Then again, but with a refs snapshot which only sees
# refs/tags/one.
git multi-pack-index write --bitmap --refs-snapshot=snapshot &&
test_path_is_file $midx &&
test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
test-tool bitmap list-commits | sort >bitmaps &&
grep "$(git rev-parse one)" bitmaps &&
! grep "$(git rev-parse two)" bitmaps
)
'
test_expect_success 'write a bitmap with --refs-snapshot (preferred tips)' '
git init repo &&
test_when_finished "rm -fr repo" &&
(
cd repo &&
test_commit_bulk --message="%s" 103 &&
git log --format="%H" >commits.raw &&
sort <commits.raw >commits &&
git log --format="create refs/tags/%s %H" HEAD >refs &&
git update-ref --stdin <refs &&
git multi-pack-index write --bitmap &&
test_path_is_file $midx &&
test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
test-tool bitmap list-commits | sort >bitmaps &&
comm -13 bitmaps commits >before &&
test_line_count = 1 before &&
(
grep -vf before commits.raw &&
# mark missing commits as preferred
sed "s/^/+/" before
) >snapshot &&
rm -fr $midx-$(midx_checksum $objdir).bitmap &&
rm -fr $midx-$(midx_checksum $objdir).rev &&
rm -fr $midx &&
git multi-pack-index write --bitmap --refs-snapshot=snapshot &&
test-tool bitmap list-commits | sort >bitmaps &&
comm -13 bitmaps commits >after &&
! test_cmp before after
)
'
test_expect_success 'hash-cache values are propagated from pack bitmaps' '
rm -fr repo &&
git init repo &&
test_when_finished "rm -fr repo" &&
(
cd repo &&
test_commit base &&
test_commit base2 &&
git repack -adb &&
test-tool bitmap dump-hashes >pack.raw &&
test_file_not_empty pack.raw &&
sort pack.raw >pack.hashes &&
test_commit new &&
git repack &&
git multi-pack-index write --bitmap &&
test-tool bitmap dump-hashes >midx.raw &&
sort midx.raw >midx.hashes &&
# ensure that every namehash in the pack bitmap can be found in
# the midx bitmap (i.e., that there are no oid-namehash pairs
# unique to the pack bitmap).
comm -23 pack.hashes midx.hashes >dropped.hashes &&
test_must_be_empty dropped.hashes
)
'
test_expect_failure 'changing the preferred pack does not corrupt bitmaps' '
rm -fr repo &&
git init repo &&
test_when_finished "rm -fr repo" &&
(
cd repo &&
test_commit A &&
test_commit B &&
git rev-list --objects --no-object-names HEAD^ >A.objects &&
git rev-list --objects --no-object-names HEAD^.. >B.objects &&
A=$(git pack-objects $objdir/pack/pack <A.objects) &&
B=$(git pack-objects $objdir/pack/pack <B.objects) &&
cat >indexes <<-EOF &&
pack-$A.idx
pack-$B.idx
EOF
git multi-pack-index write --bitmap --stdin-packs \
--preferred-pack=pack-$A.pack <indexes &&
git rev-list --test-bitmap A &&
git multi-pack-index write --bitmap --stdin-packs \
--preferred-pack=pack-$B.pack <indexes &&
git rev-list --test-bitmap A
)
'
test_done