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https://github.com/git/git
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c8a45eb66e
In17c35c8969(packfile: skip loading index if in multi-pack-index, 2018-07-12) we stopped loading the .idx file for packs that are contained within a multi-pack index. This saves us the effort of loading an .idx and doing some lightweight validity checks by way of 'packfile.c:load_idx()', but introduces a race between processes that need to load the index (e.g., to generate a reverse index) and processes that can delete the index. For example, running the following in your shell: $ git init repo && cd repo $ git commit --allow-empty -m 'base' $ git repack -ad && git multi-pack-index write followed by: $ rm -f .git/objects/pack/pack-*.idx $ git rev-parse HEAD | git cat-file --batch-check='%(objectsize:disk)' will result in a segfault prior to this patch. What's happening here is that we notice that the pack is in the multi-pack index, and so don't check that it still has a .idx. When we then try and load that index to generate a reverse index, we don't have it, so the call to 'find_pack_revindex()' in 'packfile.c:packed_object_info()' returns NULL, and then dereferencing it causes a segfault. Of course, we don't ever expect someone to remove the index file by hand, or to be in a state where we never wrote it to begin with (yet find that pack in the multi-pack-index). But, this can happen in a timing race with 'git repack -ad', which removes all existing packs after writing a new pack containing all of their objects. Avoid this by reverting the hunk of17c35c8969which stops loading the index when the pack is contained in a MIDX. This makes the latter half of17c35c8969useless, since we'll always have a non-NULL 'p->index_data', in which case that if statement isn't guarding anything. These two together effectively revert17c35c8969, and avoid the race explained above. Co-authored-by: Jeff King <peff@peff.net> Signed-off-by: Taylor Blau <me@ttaylorr.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
570 lines
16 KiB
Bash
Executable file
570 lines
16 KiB
Bash
Executable file
#!/bin/sh
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test_description='multi-pack-indexes'
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. ./test-lib.sh
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objdir=.git/objects
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midx_read_expect () {
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NUM_PACKS=$1
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NUM_OBJECTS=$2
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NUM_CHUNKS=$3
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OBJECT_DIR=$4
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EXTRA_CHUNKS="$5"
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{
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cat <<-EOF &&
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header: 4d494458 1 $NUM_CHUNKS $NUM_PACKS
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chunks: pack-names oid-fanout oid-lookup object-offsets$EXTRA_CHUNKS
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num_objects: $NUM_OBJECTS
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packs:
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EOF
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if test $NUM_PACKS -ge 1
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then
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ls $OBJECT_DIR/pack/ | grep idx | sort
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fi &&
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printf "object-dir: $OBJECT_DIR\n"
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} >expect &&
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test-tool read-midx $OBJECT_DIR >actual &&
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test_cmp expect actual
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}
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test_expect_success 'write midx with no packs' '
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test_when_finished rm -f pack/multi-pack-index &&
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git multi-pack-index --object-dir=. write &&
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midx_read_expect 0 0 4 .
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'
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generate_objects () {
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i=$1
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iii=$(printf '%03i' $i)
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{
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test-tool genrandom "bar" 200 &&
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test-tool genrandom "baz $iii" 50
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} >wide_delta_$iii &&
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{
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test-tool genrandom "foo"$i 100 &&
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test-tool genrandom "foo"$(( $i + 1 )) 100 &&
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test-tool genrandom "foo"$(( $i + 2 )) 100
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} >deep_delta_$iii &&
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{
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echo $iii &&
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test-tool genrandom "$iii" 8192
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} >file_$iii &&
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git update-index --add file_$iii deep_delta_$iii wide_delta_$iii
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}
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commit_and_list_objects () {
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{
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echo 101 &&
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test-tool genrandom 100 8192;
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} >file_101 &&
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git update-index --add file_101 &&
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tree=$(git write-tree) &&
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commit=$(git commit-tree $tree -p HEAD</dev/null) &&
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{
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echo $tree &&
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git ls-tree $tree | sed -e "s/.* \\([0-9a-f]*\\) .*/\\1/"
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} >obj-list &&
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git reset --hard $commit
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}
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test_expect_success 'create objects' '
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test_commit initial &&
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for i in $(test_seq 1 5)
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do
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generate_objects $i
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done &&
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commit_and_list_objects
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'
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test_expect_success 'write midx with one v1 pack' '
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pack=$(git pack-objects --index-version=1 $objdir/pack/test <obj-list) &&
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test_when_finished rm $objdir/pack/test-$pack.pack \
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$objdir/pack/test-$pack.idx $objdir/pack/multi-pack-index &&
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git multi-pack-index --object-dir=$objdir write &&
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midx_read_expect 1 18 4 $objdir
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'
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midx_git_two_modes () {
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git -c core.multiPackIndex=false $1 >expect &&
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git -c core.multiPackIndex=true $1 >actual &&
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if [ "$2" = "sorted" ]
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then
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sort <expect >expect.sorted &&
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mv expect.sorted expect &&
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sort <actual >actual.sorted &&
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mv actual.sorted actual
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fi &&
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test_cmp expect actual
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}
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compare_results_with_midx () {
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MSG=$1
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test_expect_success "check normal git operations: $MSG" '
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midx_git_two_modes "rev-list --objects --all" &&
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midx_git_two_modes "log --raw" &&
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midx_git_two_modes "count-objects --verbose" &&
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midx_git_two_modes "cat-file --batch-all-objects --batch-check" &&
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midx_git_two_modes "cat-file --batch-all-objects --batch-check --unordered" sorted
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'
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}
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test_expect_success 'write midx with one v2 pack' '
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git pack-objects --index-version=2,0x40 $objdir/pack/test <obj-list &&
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git multi-pack-index --object-dir=$objdir write &&
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midx_read_expect 1 18 4 $objdir
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'
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compare_results_with_midx "one v2 pack"
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test_expect_success 'corrupt idx reports errors' '
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idx=$(test-tool read-midx $objdir | grep "\.idx\$") &&
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mv $objdir/pack/$idx backup-$idx &&
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test_when_finished "mv backup-\$idx \$objdir/pack/\$idx" &&
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# This is the minimum size for a sha-1 based .idx; this lets
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# us pass perfunctory tests, but anything that actually opens and reads
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# the idx file will complain.
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test_copy_bytes 1064 <backup-$idx >$objdir/pack/$idx &&
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git -c core.multiPackIndex=true rev-list --objects --all 2>err &&
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grep "index unavailable" err
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'
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test_expect_success 'add more objects' '
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for i in $(test_seq 6 10)
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do
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generate_objects $i
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done &&
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commit_and_list_objects
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'
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test_expect_success 'write midx with two packs' '
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git pack-objects --index-version=1 $objdir/pack/test-2 <obj-list &&
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git multi-pack-index --object-dir=$objdir write &&
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midx_read_expect 2 34 4 $objdir
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'
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compare_results_with_midx "two packs"
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test_expect_success 'add more packs' '
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for j in $(test_seq 11 20)
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do
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generate_objects $j &&
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commit_and_list_objects &&
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git pack-objects --index-version=2 $objdir/pack/test-pack <obj-list
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done
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'
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compare_results_with_midx "mixed mode (two packs + extra)"
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test_expect_success 'write midx with twelve packs' '
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git multi-pack-index --object-dir=$objdir write &&
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midx_read_expect 12 74 4 $objdir
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'
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compare_results_with_midx "twelve packs"
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test_expect_success 'verify multi-pack-index success' '
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git multi-pack-index verify --object-dir=$objdir
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'
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# usage: corrupt_midx_and_verify <pos> <data> <objdir> <string>
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corrupt_midx_and_verify() {
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POS=$1 &&
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DATA="${2:-\0}" &&
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OBJDIR=$3 &&
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GREPSTR="$4" &&
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COMMAND="$5" &&
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if test -z "$COMMAND"
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then
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COMMAND="git multi-pack-index verify --object-dir=$OBJDIR"
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fi &&
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FILE=$OBJDIR/pack/multi-pack-index &&
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chmod a+w $FILE &&
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test_when_finished mv midx-backup $FILE &&
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cp $FILE midx-backup &&
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printf "$DATA" | dd of="$FILE" bs=1 seek="$POS" conv=notrunc &&
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test_must_fail $COMMAND 2>test_err &&
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grep -v "^+" test_err >err &&
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test_i18ngrep "$GREPSTR" err
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}
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test_expect_success 'verify bad signature' '
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corrupt_midx_and_verify 0 "\00" $objdir \
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"multi-pack-index signature"
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'
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HASH_LEN=20
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NUM_OBJECTS=74
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MIDX_BYTE_VERSION=4
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MIDX_BYTE_OID_VERSION=5
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MIDX_BYTE_CHUNK_COUNT=6
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MIDX_HEADER_SIZE=12
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MIDX_BYTE_CHUNK_ID=$MIDX_HEADER_SIZE
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MIDX_BYTE_CHUNK_OFFSET=$(($MIDX_HEADER_SIZE + 4))
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MIDX_NUM_CHUNKS=5
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MIDX_CHUNK_LOOKUP_WIDTH=12
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MIDX_OFFSET_PACKNAMES=$(($MIDX_HEADER_SIZE + \
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$MIDX_NUM_CHUNKS * $MIDX_CHUNK_LOOKUP_WIDTH))
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MIDX_BYTE_PACKNAME_ORDER=$(($MIDX_OFFSET_PACKNAMES + 2))
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MIDX_OFFSET_OID_FANOUT=$(($MIDX_OFFSET_PACKNAMES + 652))
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MIDX_OID_FANOUT_WIDTH=4
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MIDX_BYTE_OID_FANOUT_ORDER=$((MIDX_OFFSET_OID_FANOUT + 250 * $MIDX_OID_FANOUT_WIDTH + 1))
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MIDX_OFFSET_OID_LOOKUP=$(($MIDX_OFFSET_OID_FANOUT + 256 * $MIDX_OID_FANOUT_WIDTH))
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MIDX_BYTE_OID_LOOKUP=$(($MIDX_OFFSET_OID_LOOKUP + 16 * $HASH_LEN))
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MIDX_OFFSET_OBJECT_OFFSETS=$(($MIDX_OFFSET_OID_LOOKUP + $NUM_OBJECTS * $HASH_LEN))
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MIDX_OFFSET_WIDTH=8
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MIDX_BYTE_PACK_INT_ID=$(($MIDX_OFFSET_OBJECT_OFFSETS + 16 * $MIDX_OFFSET_WIDTH + 2))
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MIDX_BYTE_OFFSET=$(($MIDX_OFFSET_OBJECT_OFFSETS + 16 * $MIDX_OFFSET_WIDTH + 6))
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test_expect_success 'verify bad version' '
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corrupt_midx_and_verify $MIDX_BYTE_VERSION "\00" $objdir \
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"multi-pack-index version"
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'
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test_expect_success 'verify bad OID version' '
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corrupt_midx_and_verify $MIDX_BYTE_OID_VERSION "\02" $objdir \
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"hash version"
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'
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test_expect_success 'verify truncated chunk count' '
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corrupt_midx_and_verify $MIDX_BYTE_CHUNK_COUNT "\01" $objdir \
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"missing required"
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'
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test_expect_success 'verify extended chunk count' '
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corrupt_midx_and_verify $MIDX_BYTE_CHUNK_COUNT "\07" $objdir \
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"terminating multi-pack-index chunk id appears earlier than expected"
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'
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test_expect_success 'verify missing required chunk' '
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corrupt_midx_and_verify $MIDX_BYTE_CHUNK_ID "\01" $objdir \
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"missing required"
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'
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test_expect_success 'verify invalid chunk offset' '
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corrupt_midx_and_verify $MIDX_BYTE_CHUNK_OFFSET "\01" $objdir \
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"invalid chunk offset (too large)"
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'
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test_expect_success 'verify packnames out of order' '
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corrupt_midx_and_verify $MIDX_BYTE_PACKNAME_ORDER "z" $objdir \
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"pack names out of order"
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'
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test_expect_success 'verify packnames out of order' '
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corrupt_midx_and_verify $MIDX_BYTE_PACKNAME_ORDER "a" $objdir \
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"failed to load pack"
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'
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test_expect_success 'verify oid fanout out of order' '
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corrupt_midx_and_verify $MIDX_BYTE_OID_FANOUT_ORDER "\01" $objdir \
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"oid fanout out of order"
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'
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test_expect_success 'verify oid lookup out of order' '
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corrupt_midx_and_verify $MIDX_BYTE_OID_LOOKUP "\00" $objdir \
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"oid lookup out of order"
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'
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test_expect_success 'verify incorrect pack-int-id' '
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corrupt_midx_and_verify $MIDX_BYTE_PACK_INT_ID "\07" $objdir \
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"bad pack-int-id"
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'
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test_expect_success 'verify incorrect offset' '
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corrupt_midx_and_verify $MIDX_BYTE_OFFSET "\07" $objdir \
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"incorrect object offset"
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'
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test_expect_success 'git-fsck incorrect offset' '
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corrupt_midx_and_verify $MIDX_BYTE_OFFSET "\07" $objdir \
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"incorrect object offset" \
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"git -c core.multipackindex=true fsck"
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'
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test_expect_success 'repack removes multi-pack-index' '
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test_path_is_file $objdir/pack/multi-pack-index &&
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GIT_TEST_MULTI_PACK_INDEX=0 git repack -adf &&
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test_path_is_missing $objdir/pack/multi-pack-index
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'
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compare_results_with_midx "after repack"
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test_expect_success 'multi-pack-index and pack-bitmap' '
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git -c repack.writeBitmaps=true repack -ad &&
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git multi-pack-index write &&
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git rev-list --test-bitmap HEAD
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'
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test_expect_success 'multi-pack-index and alternates' '
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git init --bare alt.git &&
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echo $(pwd)/alt.git/objects >.git/objects/info/alternates &&
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echo content1 >file1 &&
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altblob=$(GIT_DIR=alt.git git hash-object -w file1) &&
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git cat-file blob $altblob &&
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git rev-list --all
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'
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compare_results_with_midx "with alternate (local midx)"
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test_expect_success 'multi-pack-index in an alternate' '
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mv .git/objects/pack/* alt.git/objects/pack &&
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test_commit add_local_objects &&
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git repack --local &&
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git multi-pack-index write &&
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midx_read_expect 1 3 4 $objdir &&
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git reset --hard HEAD~1 &&
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rm -f .git/objects/pack/*
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'
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compare_results_with_midx "with alternate (remote midx)"
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# usage: corrupt_data <file> <pos> [<data>]
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corrupt_data () {
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file=$1
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pos=$2
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data="${3:-\0}"
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printf "$data" | dd of="$file" bs=1 seek="$pos" conv=notrunc
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}
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# Force 64-bit offsets by manipulating the idx file.
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# This makes the IDX file _incorrect_ so be careful to clean up after!
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test_expect_success 'force some 64-bit offsets with pack-objects' '
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mkdir objects64 &&
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mkdir objects64/pack &&
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for i in $(test_seq 1 11)
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do
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generate_objects 11
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done &&
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commit_and_list_objects &&
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pack64=$(git pack-objects --index-version=2,0x40 objects64/pack/test-64 <obj-list) &&
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idx64=objects64/pack/test-64-$pack64.idx &&
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chmod u+w $idx64 &&
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corrupt_data $idx64 2999 "\02" &&
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midx64=$(git multi-pack-index --object-dir=objects64 write) &&
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midx_read_expect 1 63 5 objects64 " large-offsets"
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'
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test_expect_success 'verify multi-pack-index with 64-bit offsets' '
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git multi-pack-index verify --object-dir=objects64
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'
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NUM_OBJECTS=63
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MIDX_OFFSET_OID_FANOUT=$((MIDX_OFFSET_PACKNAMES + 54))
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MIDX_OFFSET_OID_LOOKUP=$((MIDX_OFFSET_OID_FANOUT + 256 * $MIDX_OID_FANOUT_WIDTH))
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MIDX_OFFSET_OBJECT_OFFSETS=$(($MIDX_OFFSET_OID_LOOKUP + $NUM_OBJECTS * $HASH_LEN))
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MIDX_OFFSET_LARGE_OFFSETS=$(($MIDX_OFFSET_OBJECT_OFFSETS + $NUM_OBJECTS * $MIDX_OFFSET_WIDTH))
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MIDX_BYTE_LARGE_OFFSET=$(($MIDX_OFFSET_LARGE_OFFSETS + 3))
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test_expect_success 'verify incorrect 64-bit offset' '
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corrupt_midx_and_verify $MIDX_BYTE_LARGE_OFFSET "\07" objects64 \
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"incorrect object offset"
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'
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test_expect_success 'setup expire tests' '
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mkdir dup &&
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(
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cd dup &&
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git init &&
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test-tool genrandom "data" 4096 >large_file.txt &&
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git update-index --add large_file.txt &&
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for i in $(test_seq 1 20)
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do
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test_commit $i
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done &&
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git branch A HEAD &&
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git branch B HEAD~8 &&
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git branch C HEAD~13 &&
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git branch D HEAD~16 &&
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git branch E HEAD~18 &&
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git pack-objects --revs .git/objects/pack/pack-A <<-EOF &&
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refs/heads/A
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^refs/heads/B
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EOF
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git pack-objects --revs .git/objects/pack/pack-B <<-EOF &&
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refs/heads/B
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^refs/heads/C
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EOF
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git pack-objects --revs .git/objects/pack/pack-C <<-EOF &&
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refs/heads/C
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^refs/heads/D
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EOF
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git pack-objects --revs .git/objects/pack/pack-D <<-EOF &&
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refs/heads/D
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^refs/heads/E
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EOF
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git pack-objects --revs .git/objects/pack/pack-E <<-EOF &&
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refs/heads/E
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EOF
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git multi-pack-index write &&
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cp -r .git/objects/pack .git/objects/pack-backup
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)
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'
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test_expect_success 'expire does not remove any packs' '
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(
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cd dup &&
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ls .git/objects/pack >expect &&
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git multi-pack-index expire &&
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ls .git/objects/pack >actual &&
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test_cmp expect actual
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)
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'
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test_expect_success 'expire removes unreferenced packs' '
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(
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cd dup &&
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git pack-objects --revs .git/objects/pack/pack-combined <<-EOF &&
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refs/heads/A
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^refs/heads/C
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EOF
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git multi-pack-index write &&
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ls .git/objects/pack | grep -v -e pack-[AB] >expect &&
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git multi-pack-index expire &&
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ls .git/objects/pack >actual &&
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test_cmp expect actual &&
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ls .git/objects/pack/ | grep idx >expect-idx &&
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test-tool read-midx .git/objects | grep idx >actual-midx &&
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test_cmp expect-idx actual-midx &&
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git multi-pack-index verify &&
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git fsck
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)
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'
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test_expect_success 'repack with minimum size does not alter existing packs' '
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(
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cd dup &&
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rm -rf .git/objects/pack &&
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mv .git/objects/pack-backup .git/objects/pack &&
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touch -m -t 201901010000 .git/objects/pack/pack-D* &&
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|
touch -m -t 201901010001 .git/objects/pack/pack-C* &&
|
|
touch -m -t 201901010002 .git/objects/pack/pack-B* &&
|
|
touch -m -t 201901010003 .git/objects/pack/pack-A* &&
|
|
ls .git/objects/pack >expect &&
|
|
MINSIZE=$(test-tool path-utils file-size .git/objects/pack/*pack | sort -n | head -n 1) &&
|
|
git multi-pack-index repack --batch-size=$MINSIZE &&
|
|
ls .git/objects/pack >actual &&
|
|
test_cmp expect actual
|
|
)
|
|
'
|
|
|
|
test_expect_success 'repack creates a new pack' '
|
|
(
|
|
cd dup &&
|
|
ls .git/objects/pack/*idx >idx-list &&
|
|
test_line_count = 5 idx-list &&
|
|
THIRD_SMALLEST_SIZE=$(test-tool path-utils file-size .git/objects/pack/*pack | sort -n | head -n 3 | tail -n 1) &&
|
|
BATCH_SIZE=$(($THIRD_SMALLEST_SIZE + 1)) &&
|
|
git multi-pack-index repack --batch-size=$BATCH_SIZE &&
|
|
ls .git/objects/pack/*idx >idx-list &&
|
|
test_line_count = 6 idx-list &&
|
|
test-tool read-midx .git/objects | grep idx >midx-list &&
|
|
test_line_count = 6 midx-list
|
|
)
|
|
'
|
|
|
|
test_expect_success 'expire removes repacked packs' '
|
|
(
|
|
cd dup &&
|
|
ls -al .git/objects/pack/*pack &&
|
|
ls -S .git/objects/pack/*pack | head -n 4 >expect &&
|
|
git multi-pack-index expire &&
|
|
ls -S .git/objects/pack/*pack >actual &&
|
|
test_cmp expect actual &&
|
|
test-tool read-midx .git/objects | grep idx >midx-list &&
|
|
test_line_count = 4 midx-list
|
|
)
|
|
'
|
|
|
|
test_expect_success 'expire works when adding new packs' '
|
|
(
|
|
cd dup &&
|
|
git pack-objects --revs .git/objects/pack/pack-combined <<-EOF &&
|
|
refs/heads/A
|
|
^refs/heads/B
|
|
EOF
|
|
git pack-objects --revs .git/objects/pack/pack-combined <<-EOF &&
|
|
refs/heads/B
|
|
^refs/heads/C
|
|
EOF
|
|
git pack-objects --revs .git/objects/pack/pack-combined <<-EOF &&
|
|
refs/heads/C
|
|
^refs/heads/D
|
|
EOF
|
|
git multi-pack-index write &&
|
|
git pack-objects --revs .git/objects/pack/a-pack <<-EOF &&
|
|
refs/heads/D
|
|
^refs/heads/E
|
|
EOF
|
|
git multi-pack-index write &&
|
|
git pack-objects --revs .git/objects/pack/z-pack <<-EOF &&
|
|
refs/heads/E
|
|
EOF
|
|
git multi-pack-index expire &&
|
|
ls .git/objects/pack/ | grep idx >expect &&
|
|
test-tool read-midx .git/objects | grep idx >actual &&
|
|
test_cmp expect actual &&
|
|
git multi-pack-index verify
|
|
)
|
|
'
|
|
|
|
test_expect_success 'expire respects .keep files' '
|
|
(
|
|
cd dup &&
|
|
git pack-objects --revs .git/objects/pack/pack-all <<-EOF &&
|
|
refs/heads/A
|
|
EOF
|
|
git multi-pack-index write &&
|
|
PACKA=$(ls .git/objects/pack/a-pack*\.pack | sed s/\.pack\$//) &&
|
|
touch $PACKA.keep &&
|
|
git multi-pack-index expire &&
|
|
ls -S .git/objects/pack/a-pack* | grep $PACKA >a-pack-files &&
|
|
test_line_count = 3 a-pack-files &&
|
|
test-tool read-midx .git/objects | grep idx >midx-list &&
|
|
test_line_count = 2 midx-list
|
|
)
|
|
'
|
|
|
|
test_expect_success 'repack --batch-size=0 repacks everything' '
|
|
(
|
|
cd dup &&
|
|
rm .git/objects/pack/*.keep &&
|
|
ls .git/objects/pack/*idx >idx-list &&
|
|
test_line_count = 2 idx-list &&
|
|
git multi-pack-index repack --batch-size=0 &&
|
|
ls .git/objects/pack/*idx >idx-list &&
|
|
test_line_count = 3 idx-list &&
|
|
test-tool read-midx .git/objects | grep idx >midx-list &&
|
|
test_line_count = 3 midx-list &&
|
|
git multi-pack-index expire &&
|
|
ls -al .git/objects/pack/*idx >idx-list &&
|
|
test_line_count = 1 idx-list &&
|
|
git multi-pack-index repack --batch-size=0 &&
|
|
ls -al .git/objects/pack/*idx >new-idx-list &&
|
|
test_cmp idx-list new-idx-list
|
|
)
|
|
'
|
|
|
|
test_expect_success 'load reverse index when missing .idx' '
|
|
git init repo &&
|
|
test_when_finished "rm -fr repo" &&
|
|
(
|
|
cd repo &&
|
|
|
|
git config core.multiPackIndex true &&
|
|
|
|
test_commit base &&
|
|
git repack -ad &&
|
|
git multi-pack-index write &&
|
|
|
|
git rev-parse HEAD >tip &&
|
|
idx=$(ls .git/objects/pack/pack-*.idx) &&
|
|
|
|
mv $idx $idx.bak &&
|
|
git cat-file --batch-check="%(objectsize:disk)" <tip
|
|
)
|
|
'
|
|
|
|
test_done
|