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git/t/t5319-multi-pack-index.sh
Jeff King 7538f9d89b t5319: make corrupted large-offset test more robust 
The test t5319.88 ("reader bounds-checks large offset table") can fail
intermittently. The failure mode looks like this:

  1. An earlier test sets up "objects64", a directory that can be used
     to produce a midx with a corrupted large-offsets table. To get the
     large offsets, it corrupts the normal ".idx" file to have a fake
     large offset, and then builds a midx from that.

     That midx now has a large offset table, which is what we want. But
     we also have a .idx on disk that has a corrupted entry. We'll call
     the object with the corrupted large-offset "X".

  2. In t5319.88, we further corrupt the midx by reducing the size of
     the large-offset chunk (because our goal is to make sure we do not
     do an out-of-bounds read on it).

  3. We then enumerate all of the objects with "cat-file --batch-check
     --batch-all-objects", expecting to see a complaint when we try to
     show object X. We use --batch-all-objects because our objects64
     repo doesn't actually have any refs (but if we check them all, one
     of them will be the failing one). The default batch-check format
     includes %(objecttype) and %(objectsize), both of which require us
     to access the actual pack data (and thus requires looking at the
     offset).

  4a. Usually, this succeeds. We try to output object X, do a lookup via
      the midx for the type/size lookup, and run into the corrupt
      large-offset table.

  4b. But sometimes we hit a different error. If another object points
      to X as a delta base, then trying to find the type of that object
      requires walking the delta chain to the base entry (since only the
      base has the concrete type; deltas themselves are either OFS_DELTA
      or REF_DELTA).

      Normally this would not require separate offset lookups at all, as
      deltas are usually stored as OFS_DELTA, specifying the relative
      offset to the base. But the corrupt idx created in step 1 is done
      directly with "git pack-objects" and does not pass the
      --delta-base-offset option, meaning we have REF_DELTA entries!
      Those do have to consult an index to find the location of the base
      object, and they use the pack .idx to do this. The same pack .idx
      that we know is corrupted from step 1!

      Git does notice the error, but it does so by seeing the corrupt
      .idx file, not the corrupt midx file, and the error it reports is
      different, causing the test to fail.

The set of objects created in the test is deterministic. But the delta
selection seems not to be (which is not too surprising, as it is
multi-threaded). I have seen the failure in Windows CI but haven't
reproduced it locally (not even with --stress). Re-running a failed
Windows CI job tends to work. But when I download and examine the trash
directory from a failed run, it shows a different set of deltas than I
get locally. But the exact source of non-determinism isn't that
important; our test should be robust against any order.

There are a few options to fix this:

  a. It would be OK for the "objects64" setup to "unbreak" the .idx file
     after generating the midx. But then it would be hard for subsequent
     tests to reuse it, since it is the corrupted idx that forces the
     midx to have a large offset table.

  b. The "objects64" setup could use --delta-base-offset. This would fix
     our problem, but earlier tests have many hard-coded offsets. Using
     OFS_DELTA would change the locations of objects in the pack (this
     might even be OK because I think most of the offsets are within the
     .idx file, but it seems brittle and I'm afraid to touch it).

  c. Our cat-file output is in oid order by default. Since we store
     bases before deltas, if we went in pack order (using the
     "--unordered" flag), we'd always see our corrupt X before any delta
     which depends on it. But using "--unordered" means we skip the midx
     entirely. That makes sense, since it is just enumerating all of
     the packs, using the offsets found in their .idx files directly.
     So it doesn't work for our test.

  d. We could ask directly about object X, rather than enumerating all
     of them. But that requires further hard-coding of the oid (both
     sha1 and sha256) of object X. I'd prefer not to introduce more
     brittleness.

  e. We can use a --batch-check format that looks at the pack data, but
     doesn't have to chase deltas. The problem in this case is
     %(objecttype), which has to walk to the base. But %(objectsize)
     does not; we can get the value directly from the delta itself.
     Another option would be %(deltabase), where we report the REF_DELTA
     name but don't look at its data.

I've gone with option (e) here. It's kind of subtle, but it's simple and
has no side effects.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-10-14 10:17:25 -07:00

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#!/bin/sh
test_description='multi-pack-indexes'
. ./test-lib.sh
. "$TEST_DIRECTORY"/lib-chunk.sh
GIT_TEST_MULTI_PACK_INDEX=0
objdir=.git/objects
HASH_LEN=$(test_oid rawsz)
midx_read_expect () {
NUM_PACKS=$1
NUM_OBJECTS=$2
NUM_CHUNKS=$3
OBJECT_DIR=$4
EXTRA_CHUNKS="$5"
{
cat <<-EOF &&
header: 4d494458 1 $HASH_LEN $NUM_CHUNKS $NUM_PACKS
chunks: pack-names oid-fanout oid-lookup object-offsets$EXTRA_CHUNKS
num_objects: $NUM_OBJECTS
packs:
EOF
if test $NUM_PACKS -ge 1
then
ls $OBJECT_DIR/pack/ | grep idx | sort
fi &&
printf "object-dir: $OBJECT_DIR\n"
} >expect &&
test-tool read-midx $OBJECT_DIR >actual &&
test_cmp expect actual
}
test_expect_success 'setup' '
test_oid_cache <<-EOF
idxoff sha1:2999
idxoff sha256:3739
packnameoff sha1:652
packnameoff sha256:940
fanoutoff sha1:1
fanoutoff sha256:3
EOF
'
test_expect_success "don't write midx with no packs" '
test_must_fail git multi-pack-index --object-dir=. write &&
test_path_is_missing pack/multi-pack-index
'
test_expect_success SHA1 'warn if a midx contains no oid' '
cp "$TEST_DIRECTORY"/t5319/no-objects.midx $objdir/pack/multi-pack-index &&
test_must_fail git multi-pack-index verify &&
rm $objdir/pack/multi-pack-index
'
generate_objects () {
i=$1
iii=$(printf '%03i' $i)
{
test-tool genrandom "bar" 200 &&
test-tool genrandom "baz $iii" 50
} >wide_delta_$iii &&
{
test-tool genrandom "foo"$i 100 &&
test-tool genrandom "foo"$(( $i + 1 )) 100 &&
test-tool genrandom "foo"$(( $i + 2 )) 100
} >deep_delta_$iii &&
{
echo $iii &&
test-tool genrandom "$iii" 8192
} >file_$iii &&
git update-index --add file_$iii deep_delta_$iii wide_delta_$iii
}
commit_and_list_objects () {
{
echo 101 &&
test-tool genrandom 100 8192;
} >file_101 &&
git update-index --add file_101 &&
tree=$(git write-tree) &&
commit=$(git commit-tree $tree -p HEAD</dev/null) &&
{
echo $tree &&
git ls-tree $tree | sed -e "s/.* \\([0-9a-f]*\\) .*/\\1/"
} >obj-list &&
git reset --hard $commit
}
test_expect_success 'create objects' '
test_commit initial &&
for i in $(test_seq 1 5)
do
generate_objects $i || return 1
done &&
commit_and_list_objects
'
test_expect_success 'write midx with one v1 pack' '
pack=$(git pack-objects --index-version=1 $objdir/pack/test <obj-list) &&
test_when_finished rm $objdir/pack/test-$pack.pack \
$objdir/pack/test-$pack.idx $objdir/pack/multi-pack-index &&
git multi-pack-index --object-dir=$objdir write &&
midx_read_expect 1 18 4 $objdir
'
midx_git_two_modes () {
git -c core.multiPackIndex=false $1 >expect &&
git -c core.multiPackIndex=true $1 >actual &&
if [ "$2" = "sorted" ]
then
sort <expect >expect.sorted &&
mv expect.sorted expect &&
sort <actual >actual.sorted &&
mv actual.sorted actual
fi &&
test_cmp expect actual
}
compare_results_with_midx () {
MSG=$1
test_expect_success "check normal git operations: $MSG" '
midx_git_two_modes "rev-list --objects --all" &&
midx_git_two_modes "log --raw" &&
midx_git_two_modes "count-objects --verbose" &&
midx_git_two_modes "cat-file --batch-all-objects --batch-check" &&
midx_git_two_modes "cat-file --batch-all-objects --batch-check --unordered" sorted
'
}
test_expect_success 'write midx with one v2 pack' '
git pack-objects --index-version=2,0x40 $objdir/pack/test <obj-list &&
git multi-pack-index --object-dir=$objdir write &&
midx_read_expect 1 18 4 $objdir
'
compare_results_with_midx "one v2 pack"
test_expect_success 'corrupt idx reports errors' '
idx=$(test-tool read-midx $objdir | grep "\.idx\$") &&
mv $objdir/pack/$idx backup-$idx &&
test_when_finished "mv backup-\$idx \$objdir/pack/\$idx" &&
# This is the minimum size for a sha-1 based .idx; this lets
# us pass perfunctory tests, but anything that actually opens and reads
# the idx file will complain.
test_copy_bytes 1064 <backup-$idx >$objdir/pack/$idx &&
git -c core.multiPackIndex=true rev-list --objects --all 2>err &&
grep "index unavailable" err
'
test_expect_success 'add more objects' '
for i in $(test_seq 6 10)
do
generate_objects $i || return 1
done &&
commit_and_list_objects
'
test_expect_success 'write midx with two packs' '
git pack-objects --index-version=1 $objdir/pack/test-2 <obj-list &&
git multi-pack-index --object-dir=$objdir write &&
midx_read_expect 2 34 4 $objdir
'
compare_results_with_midx "two packs"
test_expect_success 'write midx with --stdin-packs' '
rm -fr $objdir/pack/multi-pack-index &&
idx="$(find $objdir/pack -name "test-2-*.idx")" &&
basename "$idx" >in &&
git multi-pack-index write --stdin-packs <in &&
test-tool read-midx $objdir | grep "\.idx$" >packs &&
test_cmp packs in
'
compare_results_with_midx "mixed mode (one pack + extra)"
test_expect_success 'write with no objects and preferred pack' '
test_when_finished "rm -rf empty" &&
git init empty &&
test_must_fail git -C empty multi-pack-index write \
--stdin-packs --preferred-pack=does-not-exist </dev/null 2>err &&
cat >expect <<-EOF &&
warning: unknown preferred pack: ${SQ}does-not-exist${SQ}
error: no pack files to index.
EOF
test_cmp expect err
'
test_expect_success 'write progress off for redirected stderr' '
git multi-pack-index --object-dir=$objdir write 2>err &&
test_line_count = 0 err
'
test_expect_success 'write force progress on for stderr' '
GIT_PROGRESS_DELAY=0 git multi-pack-index --object-dir=$objdir write --progress 2>err &&
test_file_not_empty err
'
test_expect_success 'write with the --no-progress option' '
GIT_PROGRESS_DELAY=0 git multi-pack-index --object-dir=$objdir write --no-progress 2>err &&
test_line_count = 0 err
'
test_expect_success 'add more packs' '
for j in $(test_seq 11 20)
do
generate_objects $j &&
commit_and_list_objects &&
git pack-objects --index-version=2 $objdir/pack/test-pack <obj-list || return 1
done
'
compare_results_with_midx "mixed mode (two packs + extra)"
test_expect_success 'write midx with twelve packs' '
git multi-pack-index --object-dir=$objdir write &&
midx_read_expect 12 74 4 $objdir
'
compare_results_with_midx "twelve packs"
test_expect_success 'multi-pack-index *.rev cleanup with --object-dir' '
git init repo &&
git clone -s repo alternate &&
test_when_finished "rm -rf repo alternate" &&
(
cd repo &&
test_commit base &&
git repack -d
) &&
ours="alternate/.git/objects/pack/multi-pack-index-123.rev" &&
theirs="repo/.git/objects/pack/multi-pack-index-abc.rev" &&
touch "$ours" "$theirs" &&
(
cd alternate &&
git multi-pack-index --object-dir ../repo/.git/objects write
) &&
# writing a midx in "repo" should not remove the .rev file in the
# alternate
test_path_is_file repo/.git/objects/pack/multi-pack-index &&
test_path_is_file $ours &&
test_path_is_missing $theirs
'
test_expect_success 'warn on improper hash version' '
git init --object-format=sha1 sha1 &&
(
cd sha1 &&
git config core.multiPackIndex true &&
test_commit 1 &&
git repack -a &&
git multi-pack-index write &&
mv .git/objects/pack/multi-pack-index ../mpi-sha1
) &&
git init --object-format=sha256 sha256 &&
(
cd sha256 &&
git config core.multiPackIndex true &&
test_commit 1 &&
git repack -a &&
git multi-pack-index write &&
mv .git/objects/pack/multi-pack-index ../mpi-sha256
) &&
(
cd sha1 &&
mv ../mpi-sha256 .git/objects/pack/multi-pack-index &&
git log -1 2>err &&
test_i18ngrep "multi-pack-index hash version 2 does not match version 1" err
) &&
(
cd sha256 &&
mv ../mpi-sha1 .git/objects/pack/multi-pack-index &&
git log -1 2>err &&
test_i18ngrep "multi-pack-index hash version 1 does not match version 2" err
)
'
test_expect_success 'midx picks objects from preferred pack' '
test_when_finished rm -rf preferred.git &&
git init --bare preferred.git &&
(
cd preferred.git &&
a=$(echo "a" | git hash-object -w --stdin) &&
b=$(echo "b" | git hash-object -w --stdin) &&
c=$(echo "c" | git hash-object -w --stdin) &&
# Set up two packs, duplicating the object "B" at different
# offsets.
#
# Note that the "BC" pack (the one we choose as preferred) sorts
# lexically after the "AB" pack, meaning that omitting the
# --preferred-pack argument would cause this test to fail (since
# the MIDX code would select the copy of "b" in the "AB" pack).
git pack-objects objects/pack/test-AB <<-EOF &&
$a
$b
EOF
bc=$(git pack-objects objects/pack/test-BC <<-EOF
$b
$c
EOF
) &&
git multi-pack-index --object-dir=objects \
write --preferred-pack=test-BC-$bc.idx 2>err &&
test_must_be_empty err &&
test-tool read-midx --show-objects objects >out &&
ofs=$(git show-index <objects/pack/test-BC-$bc.idx | grep $b |
cut -d" " -f1) &&
printf "%s %s\tobjects/pack/test-BC-%s.pack\n" \
"$b" "$ofs" "$bc" >expect &&
grep ^$b out >actual &&
test_cmp expect actual
)
'
test_expect_success 'preferred packs must be non-empty' '
test_when_finished rm -rf preferred.git &&
git init preferred.git &&
(
cd preferred.git &&
test_commit base &&
git repack -ad &&
empty="$(git pack-objects $objdir/pack/pack </dev/null)" &&
test_must_fail git multi-pack-index write \
--preferred-pack=pack-$empty.pack 2>err &&
grep "with no objects" err
)
'
test_expect_success 'verify multi-pack-index success' '
git multi-pack-index verify --object-dir=$objdir
'
test_expect_success 'verify progress off for redirected stderr' '
git multi-pack-index verify --object-dir=$objdir 2>err &&
test_line_count = 0 err
'
test_expect_success 'verify force progress on for stderr' '
git multi-pack-index verify --object-dir=$objdir --progress 2>err &&
test_file_not_empty err
'
test_expect_success 'verify with the --no-progress option' '
git multi-pack-index verify --object-dir=$objdir --no-progress 2>err &&
test_line_count = 0 err
'
# usage: corrupt_midx_and_verify <pos> <data> <objdir> <string>
corrupt_midx_and_verify() {
POS=$1 &&
DATA="${2:-\0}" &&
OBJDIR=$3 &&
GREPSTR="$4" &&
COMMAND="$5" &&
if test -z "$COMMAND"
then
COMMAND="git multi-pack-index verify --object-dir=$OBJDIR"
fi &&
FILE=$OBJDIR/pack/multi-pack-index &&
chmod a+w $FILE &&
test_when_finished mv midx-backup $FILE &&
cp $FILE midx-backup &&
printf "$DATA" | dd of="$FILE" bs=1 seek="$POS" conv=notrunc &&
test_must_fail $COMMAND 2>test_err &&
grep -v "^+" test_err >err &&
test_i18ngrep "$GREPSTR" err
}
test_expect_success 'verify bad signature' '
corrupt_midx_and_verify 0 "\00" $objdir \
"multi-pack-index signature"
'
NUM_OBJECTS=74
MIDX_BYTE_VERSION=4
MIDX_BYTE_OID_VERSION=5
MIDX_BYTE_CHUNK_COUNT=6
MIDX_HEADER_SIZE=12
MIDX_BYTE_CHUNK_ID=$MIDX_HEADER_SIZE
MIDX_BYTE_CHUNK_OFFSET=$(($MIDX_HEADER_SIZE + 4))
MIDX_NUM_CHUNKS=5
MIDX_CHUNK_LOOKUP_WIDTH=12
MIDX_OFFSET_PACKNAMES=$(($MIDX_HEADER_SIZE + \
$MIDX_NUM_CHUNKS * $MIDX_CHUNK_LOOKUP_WIDTH))
MIDX_BYTE_PACKNAME_ORDER=$(($MIDX_OFFSET_PACKNAMES + 2))
MIDX_OFFSET_OID_FANOUT=$(($MIDX_OFFSET_PACKNAMES + $(test_oid packnameoff)))
MIDX_OID_FANOUT_WIDTH=4
MIDX_BYTE_OID_FANOUT_ORDER=$((MIDX_OFFSET_OID_FANOUT + 250 * $MIDX_OID_FANOUT_WIDTH + $(test_oid fanoutoff)))
MIDX_OFFSET_OID_LOOKUP=$(($MIDX_OFFSET_OID_FANOUT + 256 * $MIDX_OID_FANOUT_WIDTH))
MIDX_BYTE_OID_LOOKUP=$(($MIDX_OFFSET_OID_LOOKUP + 16 * $HASH_LEN))
MIDX_OFFSET_OBJECT_OFFSETS=$(($MIDX_OFFSET_OID_LOOKUP + $NUM_OBJECTS * $HASH_LEN))
MIDX_OFFSET_WIDTH=8
MIDX_BYTE_PACK_INT_ID=$(($MIDX_OFFSET_OBJECT_OFFSETS + 16 * $MIDX_OFFSET_WIDTH + 2))
MIDX_BYTE_OFFSET=$(($MIDX_OFFSET_OBJECT_OFFSETS + 16 * $MIDX_OFFSET_WIDTH + 6))
test_expect_success 'verify bad version' '
corrupt_midx_and_verify $MIDX_BYTE_VERSION "\00" $objdir \
"multi-pack-index version"
'
test_expect_success 'verify bad OID version' '
corrupt_midx_and_verify $MIDX_BYTE_OID_VERSION "\03" $objdir \
"hash version"
'
test_expect_success 'verify truncated chunk count' '
corrupt_midx_and_verify $MIDX_BYTE_CHUNK_COUNT "\01" $objdir \
"final chunk has non-zero id"
'
test_expect_success 'verify extended chunk count' '
corrupt_midx_and_verify $MIDX_BYTE_CHUNK_COUNT "\07" $objdir \
"terminating chunk id appears earlier than expected"
'
test_expect_success 'verify missing required chunk' '
corrupt_midx_and_verify $MIDX_BYTE_CHUNK_ID "\01" $objdir \
"required pack-name chunk missing"
'
test_expect_success 'verify invalid chunk offset' '
corrupt_midx_and_verify $MIDX_BYTE_CHUNK_OFFSET "\01" $objdir \
"improper chunk offset(s)"
'
test_expect_success 'verify packnames out of order' '
corrupt_midx_and_verify $MIDX_BYTE_PACKNAME_ORDER "z" $objdir \
"pack names out of order"
'
test_expect_success 'verify packnames out of order' '
corrupt_midx_and_verify $MIDX_BYTE_PACKNAME_ORDER "a" $objdir \
"failed to load pack"
'
test_expect_success 'verify oid fanout out of order' '
corrupt_midx_and_verify $MIDX_BYTE_OID_FANOUT_ORDER "\01" $objdir \
"oid fanout out of order"
'
test_expect_success 'verify oid lookup out of order' '
corrupt_midx_and_verify $MIDX_BYTE_OID_LOOKUP "\00" $objdir \
"oid lookup out of order"
'
test_expect_success 'verify incorrect pack-int-id' '
corrupt_midx_and_verify $MIDX_BYTE_PACK_INT_ID "\07" $objdir \
"bad pack-int-id"
'
test_expect_success 'verify incorrect offset' '
corrupt_midx_and_verify $MIDX_BYTE_OFFSET "\377" $objdir \
"incorrect object offset"
'
test_expect_success 'git-fsck incorrect offset' '
corrupt_midx_and_verify $MIDX_BYTE_OFFSET "\377" $objdir \
"incorrect object offset" \
"git -c core.multiPackIndex=true fsck" &&
test_unconfig core.multiPackIndex &&
test_must_fail git fsck &&
git -c core.multiPackIndex=false fsck
'
test_expect_success 'git fsck shows MIDX output with --progress' '
git fsck --progress 2>err &&
grep "Verifying OID order in multi-pack-index" err &&
grep "Verifying object offsets" err
'
test_expect_success 'git fsck suppresses MIDX output with --no-progress' '
git fsck --no-progress 2>err &&
! grep "Verifying OID order in multi-pack-index" err &&
! grep "Verifying object offsets" err
'
test_expect_success 'corrupt MIDX is not reused' '
corrupt_midx_and_verify $MIDX_BYTE_OFFSET "\377" $objdir \
"incorrect object offset" &&
git multi-pack-index write 2>err &&
test_i18ngrep checksum.mismatch err &&
git multi-pack-index verify
'
test_expect_success 'verify incorrect checksum' '
pos=$(($(wc -c <$objdir/pack/multi-pack-index) - 10)) &&
corrupt_midx_and_verify $pos \
"\377\377\377\377\377\377\377\377\377\377" \
$objdir "incorrect checksum"
'
test_expect_success 'repack progress off for redirected stderr' '
GIT_PROGRESS_DELAY=0 git multi-pack-index --object-dir=$objdir repack 2>err &&
test_line_count = 0 err
'
test_expect_success 'repack force progress on for stderr' '
GIT_PROGRESS_DELAY=0 git multi-pack-index --object-dir=$objdir repack --progress 2>err &&
test_file_not_empty err
'
test_expect_success 'repack with the --no-progress option' '
GIT_PROGRESS_DELAY=0 git multi-pack-index --object-dir=$objdir repack --no-progress 2>err &&
test_line_count = 0 err
'
test_expect_success 'repack removes multi-pack-index when deleting packs' '
test_path_is_file $objdir/pack/multi-pack-index &&
# Set GIT_TEST_MULTI_PACK_INDEX to 0 to avoid writing a new
# multi-pack-index after repacking, but set "core.multiPackIndex" to
# true so that "git repack" can read the existing MIDX.
GIT_TEST_MULTI_PACK_INDEX=0 git -c core.multiPackIndex repack -adf &&
test_path_is_missing $objdir/pack/multi-pack-index
'
test_expect_success 'repack preserves multi-pack-index when creating packs' '
git init preserve &&
test_when_finished "rm -fr preserve" &&
(
cd preserve &&
packdir=.git/objects/pack &&
midx=$packdir/multi-pack-index &&
test_commit 1 &&
pack1=$(git pack-objects --all $packdir/pack) &&
touch $packdir/pack-$pack1.keep &&
test_commit 2 &&
pack2=$(git pack-objects --revs $packdir/pack) &&
touch $packdir/pack-$pack2.keep &&
git multi-pack-index write &&
cp $midx $midx.bak &&
cat >pack-input <<-EOF &&
HEAD
^HEAD~1
EOF
test_commit 3 &&
pack3=$(git pack-objects --revs $packdir/pack <pack-input) &&
test_commit 4 &&
pack4=$(git pack-objects --revs $packdir/pack <pack-input) &&
GIT_TEST_MULTI_PACK_INDEX=0 git -c core.multiPackIndex repack -ad &&
ls -la $packdir &&
test_path_is_file $packdir/pack-$pack1.pack &&
test_path_is_file $packdir/pack-$pack2.pack &&
test_path_is_missing $packdir/pack-$pack3.pack &&
test_path_is_missing $packdir/pack-$pack4.pack &&
test_cmp_bin $midx.bak $midx
)
'
compare_results_with_midx "after repack"
test_expect_success 'multi-pack-index and pack-bitmap' '
GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP=0 \
git -c repack.writeBitmaps=true repack -ad &&
git multi-pack-index write &&
git rev-list --test-bitmap HEAD
'
test_expect_success 'multi-pack-index and alternates' '
git init --bare alt.git &&
echo $(pwd)/alt.git/objects >.git/objects/info/alternates &&
echo content1 >file1 &&
altblob=$(GIT_DIR=alt.git git hash-object -w file1) &&
git cat-file blob $altblob &&
git rev-list --all
'
compare_results_with_midx "with alternate (local midx)"
test_expect_success 'multi-pack-index in an alternate' '
mv .git/objects/pack/* alt.git/objects/pack &&
test_commit add_local_objects &&
git repack --local &&
git multi-pack-index write &&
midx_read_expect 1 3 4 $objdir &&
git reset --hard HEAD~1 &&
rm -f .git/objects/pack/*
'
compare_results_with_midx "with alternate (remote midx)"
# usage: corrupt_data <file> <pos> [<data>]
corrupt_data () {
file=$1
pos=$2
data="${3:-\0}"
printf "$data" | dd of="$file" bs=1 seek="$pos" conv=notrunc
}
# Force 64-bit offsets by manipulating the idx file.
# This makes the IDX file _incorrect_ so be careful to clean up after!
test_expect_success 'force some 64-bit offsets with pack-objects' '
mkdir objects64 &&
mkdir objects64/pack &&
for i in $(test_seq 1 11)
do
generate_objects 11 || return 1
done &&
commit_and_list_objects &&
pack64=$(git pack-objects --index-version=2,0x40 objects64/pack/test-64 <obj-list) &&
idx64=objects64/pack/test-64-$pack64.idx &&
chmod u+w $idx64 &&
corrupt_data $idx64 $(test_oid idxoff) "\02" &&
# objects64 is not a real repository, but can serve as an alternate
# anyway so we can write a MIDX into it
git init repo &&
test_when_finished "rm -fr repo" &&
(
cd repo &&
( cd ../objects64 && pwd ) >.git/objects/info/alternates &&
midx64=$(git multi-pack-index --object-dir=../objects64 write)
) &&
midx_read_expect 1 63 5 objects64 " large-offsets"
'
test_expect_success 'verify multi-pack-index with 64-bit offsets' '
git multi-pack-index verify --object-dir=objects64
'
NUM_OBJECTS=63
MIDX_OFFSET_OID_FANOUT=$((MIDX_OFFSET_PACKNAMES + 54))
MIDX_OFFSET_OID_LOOKUP=$((MIDX_OFFSET_OID_FANOUT + 256 * $MIDX_OID_FANOUT_WIDTH))
MIDX_OFFSET_OBJECT_OFFSETS=$(($MIDX_OFFSET_OID_LOOKUP + $NUM_OBJECTS * $HASH_LEN))
MIDX_OFFSET_LARGE_OFFSETS=$(($MIDX_OFFSET_OBJECT_OFFSETS + $NUM_OBJECTS * $MIDX_OFFSET_WIDTH))
MIDX_BYTE_LARGE_OFFSET=$(($MIDX_OFFSET_LARGE_OFFSETS + 3))
test_expect_success 'verify incorrect 64-bit offset' '
corrupt_midx_and_verify $MIDX_BYTE_LARGE_OFFSET "\07" objects64 \
"incorrect object offset"
'
test_expect_success 'setup expire tests' '
mkdir dup &&
(
cd dup &&
git init &&
test-tool genrandom "data" 4096 >large_file.txt &&
git update-index --add large_file.txt &&
for i in $(test_seq 1 20)
do
test_commit $i || exit 1
done &&
git branch A HEAD &&
git branch B HEAD~8 &&
git branch C HEAD~13 &&
git branch D HEAD~16 &&
git branch E HEAD~18 &&
git pack-objects --revs .git/objects/pack/pack-A <<-EOF &&
refs/heads/A
^refs/heads/B
EOF
git pack-objects --revs .git/objects/pack/pack-B <<-EOF &&
refs/heads/B
^refs/heads/C
EOF
git pack-objects --revs .git/objects/pack/pack-C <<-EOF &&
refs/heads/C
^refs/heads/D
EOF
git pack-objects --revs .git/objects/pack/pack-D <<-EOF &&
refs/heads/D
^refs/heads/E
EOF
git pack-objects --revs .git/objects/pack/pack-E <<-EOF &&
refs/heads/E
EOF
git multi-pack-index write &&
cp -r .git/objects/pack .git/objects/pack-backup
)
'
test_expect_success 'expire does not remove any packs' '
(
cd dup &&
ls .git/objects/pack >expect &&
git multi-pack-index expire &&
ls .git/objects/pack >actual &&
test_cmp expect actual
)
'
test_expect_success 'expire progress off for redirected stderr' '
(
cd dup &&
git multi-pack-index expire 2>err &&
test_line_count = 0 err
)
'
test_expect_success 'expire force progress on for stderr' '
(
cd dup &&
GIT_PROGRESS_DELAY=0 git multi-pack-index expire --progress 2>err &&
test_file_not_empty err
)
'
test_expect_success 'expire with the --no-progress option' '
(
cd dup &&
GIT_PROGRESS_DELAY=0 git multi-pack-index expire --no-progress 2>err &&
test_line_count = 0 err
)
'
test_expect_success 'expire removes unreferenced packs' '
(
cd dup &&
git pack-objects --revs .git/objects/pack/pack-combined <<-EOF &&
refs/heads/A
^refs/heads/C
EOF
git multi-pack-index write &&
ls .git/objects/pack | grep -v -e pack-[AB] >expect &&
git multi-pack-index expire &&
ls .git/objects/pack >actual &&
test_cmp expect actual &&
ls .git/objects/pack/ | grep idx >expect-idx &&
test-tool read-midx .git/objects | grep idx >actual-midx &&
test_cmp expect-idx actual-midx &&
git multi-pack-index verify &&
git fsck
)
'
test_expect_success 'repack with minimum size does not alter existing packs' '
(
cd dup &&
rm -rf .git/objects/pack &&
mv .git/objects/pack-backup .git/objects/pack &&
test-tool chmtime =-5 .git/objects/pack/pack-D* &&
test-tool chmtime =-4 .git/objects/pack/pack-C* &&
test-tool chmtime =-3 .git/objects/pack/pack-B* &&
test-tool chmtime =-2 .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 respects repack.packKeptObjects=false' '
test_when_finished rm -f dup/.git/objects/pack/*keep &&
(
cd dup &&
ls .git/objects/pack/*idx >idx-list &&
test_line_count = 5 idx-list &&
ls .git/objects/pack/*.pack | sed "s/\.pack/.keep/" >keep-list &&
test_line_count = 5 keep-list &&
for keep in $(cat keep-list)
do
touch $keep || return 1
done &&
git multi-pack-index repack --batch-size=0 &&
ls .git/objects/pack/*idx >idx-list &&
test_line_count = 5 idx-list &&
test-tool read-midx .git/objects | grep idx >midx-list &&
test_line_count = 5 midx-list &&
THIRD_SMALLEST_SIZE=$(test-tool path-utils file-size .git/objects/pack/*pack | sort -n | sed -n 3p) &&
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 = 5 idx-list &&
test-tool read-midx .git/objects | grep idx >midx-list &&
test_line_count = 5 midx-list
)
'
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 'repack (all) ignores cruft pack' '
git init repo &&
test_when_finished "rm -fr repo" &&
(
cd repo &&
test_commit base &&
test_commit --no-tag unreachable &&
git reset --hard base &&
git reflog expire --all --expire=all &&
git repack --cruft -d &&
git multi-pack-index write &&
find $objdir/pack | sort >before &&
git multi-pack-index repack --batch-size=0 &&
find $objdir/pack | sort >after &&
test_cmp before after
)
'
test_expect_success 'repack (--batch-size) ignores cruft pack' '
git init repo &&
test_when_finished "rm -fr repo" &&
(
cd repo &&
test_commit_bulk 5 &&
test_commit --no-tag unreachable &&
git reset --hard HEAD^ &&
git reflog expire --all --expire=all &&
git repack --cruft -d &&
test_commit four &&
find $objdir/pack -type f -name "*.pack" | sort >before &&
git repack -d &&
find $objdir/pack -type f -name "*.pack" | sort >after &&
pack="$(comm -13 before after)" &&
test_file_size "$pack" >sz &&
# Set --batch-size to twice the size of the pack created
# in the previous step, since this is enough to
# accommodate it and the cruft pack.
#
# This means that the MIDX machinery *could* combine the
# new and cruft packs together.
#
# We ensure that it does not below.
batch="$((($(cat sz) * 2)))" &&
git multi-pack-index write &&
find $objdir/pack | sort >before &&
git multi-pack-index repack --batch-size=$batch &&
find $objdir/pack | sort >after &&
test_cmp before after
)
'
test_expect_success 'expire removes repacked packs' '
(
cd dup &&
ls -al .git/objects/pack/*pack &&
ls -S .git/objects/pack/*pack | head -n 4 >expect &&
git multi-pack-index expire &&
ls -S .git/objects/pack/*pack >actual &&
test_cmp expect actual &&
test-tool read-midx .git/objects | grep idx >midx-list &&
test_line_count = 4 midx-list
)
'
test_expect_success 'expire works when adding new packs' '
(
cd dup &&
git pack-objects --revs .git/objects/pack/pack-combined <<-EOF &&
refs/heads/A
^refs/heads/B
EOF
git pack-objects --revs .git/objects/pack/pack-combined <<-EOF &&
refs/heads/B
^refs/heads/C
EOF
git pack-objects --revs .git/objects/pack/pack-combined <<-EOF &&
refs/heads/C
^refs/heads/D
EOF
git multi-pack-index write &&
git pack-objects --revs .git/objects/pack/a-pack <<-EOF &&
refs/heads/D
^refs/heads/E
EOF
git multi-pack-index write &&
git pack-objects --revs .git/objects/pack/z-pack <<-EOF &&
refs/heads/E
EOF
git multi-pack-index expire &&
ls .git/objects/pack/ | grep idx >expect &&
test-tool read-midx .git/objects | grep idx >actual &&
test_cmp expect actual &&
git multi-pack-index verify
)
'
test_expect_success 'expire respects .keep files' '
(
cd dup &&
git pack-objects --revs .git/objects/pack/pack-all <<-EOF &&
refs/heads/A
EOF
git multi-pack-index write &&
PACKA=$(ls .git/objects/pack/a-pack*\.pack | sed s/\.pack\$//) &&
touch $PACKA.keep &&
git multi-pack-index expire &&
test_path_is_file $PACKA.idx &&
test_path_is_file $PACKA.keep &&
test_path_is_file $PACKA.pack &&
test-tool read-midx .git/objects | grep idx >midx-list &&
test_line_count = 2 midx-list
)
'
test_expect_success 'expiring unreferenced cruft pack retains pack' '
git init repo &&
test_when_finished "rm -fr repo" &&
(
cd repo &&
test_commit base &&
test_commit --no-tag unreachable &&
unreachable=$(git rev-parse HEAD) &&
git reset --hard base &&
git reflog expire --all --expire=all &&
git repack --cruft -d &&
mtimes="$(ls $objdir/pack/pack-*.mtimes)" &&
echo "base..$unreachable" >in &&
pack="$(git pack-objects --revs --delta-base-offset \
$objdir/pack/pack <in)" &&
# Preferring the contents of "$pack" will leave the
# cruft pack unreferenced (ie., none of the objects
# contained in the cruft pack will have their MIDX copy
# selected from the cruft pack).
git multi-pack-index write --preferred-pack="pack-$pack.pack" &&
git multi-pack-index expire &&
test_path_is_file "$mtimes"
)
'
test_expect_success 'repack --batch-size=0 repacks everything' '
cp -r dup dup2 &&
(
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 'repack --batch-size=<large> repacks everything' '
(
cd dup2 &&
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=2000000 &&
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
)
'
test_expect_success 'load reverse index when missing .idx, .pack' '
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 &&
pack=$(ls .git/objects/pack/pack-*.pack) &&
idx=$(ls .git/objects/pack/pack-*.idx) &&
mv $idx $idx.bak &&
git cat-file --batch-check="%(objectsize:disk)" <tip &&
mv $idx.bak $idx &&
mv $pack $pack.bak &&
git cat-file --batch-check="%(objectsize:disk)" <tip
)
'
test_expect_success 'usage shown without sub-command' '
test_expect_code 129 git multi-pack-index 2>err &&
! test_i18ngrep "unrecognized subcommand" err
'
test_expect_success 'complains when run outside of a repository' '
nongit test_must_fail git multi-pack-index write 2>err &&
grep "not a git repository" err
'
test_expect_success 'repack with delta islands' '
git init repo &&
test_when_finished "rm -fr repo" &&
(
cd repo &&
test_commit first &&
git repack &&
test_commit second &&
git repack &&
git multi-pack-index write &&
git -c repack.useDeltaIslands=true multi-pack-index repack
)
'
corrupt_chunk () {
midx=.git/objects/pack/multi-pack-index &&
test_when_finished "rm -rf $midx" &&
git repack -ad --write-midx &&
corrupt_chunk_file $midx "$@"
}
test_expect_success 'reader notices too-small oid fanout chunk' '
corrupt_chunk OIDF clear 00000000 &&
test_must_fail git log 2>err &&
cat >expect <<-\EOF &&
error: multi-pack-index OID fanout is of the wrong size
fatal: multi-pack-index required OID fanout chunk missing or corrupted
EOF
test_cmp expect err
'
test_expect_success 'reader notices too-small oid lookup chunk' '
corrupt_chunk OIDL clear 00000000 &&
test_must_fail git log 2>err &&
cat >expect <<-\EOF &&
error: multi-pack-index OID lookup chunk is the wrong size
fatal: multi-pack-index required OID lookup chunk missing or corrupted
EOF
test_cmp expect err
'
test_expect_success 'reader notices too-small pack names chunk' '
# There is no NUL to terminate the name here, so the
# chunk is too short.
corrupt_chunk PNAM clear 70656666 &&
test_must_fail git log 2>err &&
cat >expect <<-\EOF &&
fatal: multi-pack-index pack-name chunk is too short
EOF
test_cmp expect err
'
test_expect_success 'reader handles unaligned chunks' '
# A 9-byte PNAM means all of the subsequent chunks
# will no longer be 4-byte aligned, but it is still
# a valid one-pack chunk on its own (it is "foo.pack\0").
corrupt_chunk PNAM clear 666f6f2e7061636b00 &&
git -c core.multipackindex=false log >expect.out &&
git -c core.multipackindex=true log >out 2>err &&
test_cmp expect.out out &&
cat >expect.err <<-\EOF &&
error: chunk id 4f494446 not 4-byte aligned
EOF
test_cmp expect.err err
'
test_expect_success 'reader notices too-small object offset chunk' '
corrupt_chunk OOFF clear 00000000 &&
test_must_fail git log 2>err &&
cat >expect <<-\EOF &&
error: multi-pack-index object offset chunk is the wrong size
fatal: multi-pack-index required object offsets chunk missing or corrupted
EOF
test_cmp expect err
'
test_expect_success 'reader bounds-checks large offset table' '
# re-use the objects64 dir here to cheaply get access to a midx
# with large offsets.
git init repo &&
test_when_finished "rm -rf repo" &&
(
cd repo &&
(cd ../objects64 && pwd) >.git/objects/info/alternates &&
git multi-pack-index --object-dir=../objects64 write &&
midx=../objects64/pack/multi-pack-index &&
corrupt_chunk_file $midx LOFF clear &&
# using only %(objectsize) is important here; see the commit
# message for more details
test_must_fail git cat-file --batch-all-objects \
--batch-check="%(objectsize)" 2>err &&
cat >expect <<-\EOF &&
fatal: multi-pack-index large offset out of bounds
EOF
test_cmp expect err
)
'
test_expect_success 'reader notices too-small revindex chunk' '
# We only get a revindex with bitmaps (and likewise only
# load it when they are asked for).
test_config repack.writeBitmaps true &&
corrupt_chunk RIDX clear 00000000 &&
git -c core.multipackIndex=false rev-list \
--all --use-bitmap-index >expect.out &&
git -c core.multipackIndex=true rev-list \
--all --use-bitmap-index >out 2>err &&
test_cmp expect.out out &&
cat >expect.err <<-\EOF &&
error: multi-pack-index reverse-index chunk is the wrong size
warning: multi-pack bitmap is missing required reverse index
EOF
test_cmp expect.err err
'
test_done
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