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![Derrick Stolee](/assets/img/avatar_default.png)
While parsing a .rev file, we check the header information to be sure it makes sense. This happens before doing any additional validation such as a checksum or value check. In order to differentiate between a bad header and a non-existent file, we need to update the API for loading a reverse index. Make load_pack_revindex_from_disk() non-static and specify that a positive value means "the file does not exist" while other errors during parsing are negative values. Since an invalid header prevents setting up the structures we would use for further validations, we can stop at that point. The place where we can distinguish between a missing file and a corrupt file is inside load_revindex_from_disk(), which is used both by pack rev-indexes and multi-pack-index rev-indexes. Some tests in t5326 demonstrate that it is critical to take some conditions to allow positive error signals. Add tests that check the three header values. Signed-off-by: Derrick Stolee <derrickstolee@github.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
209 lines
5.1 KiB
Bash
Executable file
209 lines
5.1 KiB
Bash
Executable file
#!/bin/sh
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test_description='on-disk reverse index'
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TEST_PASSES_SANITIZE_LEAK=true
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. ./test-lib.sh
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# The below tests want control over the 'pack.writeReverseIndex' setting
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# themselves to assert various combinations of it with other options.
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sane_unset GIT_TEST_NO_WRITE_REV_INDEX
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packdir=.git/objects/pack
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test_expect_success 'setup' '
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test_commit base &&
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test_config pack.writeReverseIndex false &&
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pack=$(git pack-objects --all $packdir/pack) &&
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rev=$packdir/pack-$pack.rev &&
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test_path_is_missing $rev
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'
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test_index_pack () {
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rm -f $rev &&
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conf=$1 &&
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shift &&
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# remove the index since Windows won't overwrite an existing file
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rm $packdir/pack-$pack.idx &&
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git -c pack.writeReverseIndex=$conf index-pack "$@" \
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$packdir/pack-$pack.pack
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}
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test_expect_success 'index-pack with pack.writeReverseIndex' '
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test_index_pack "" &&
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test_path_is_missing $rev &&
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test_index_pack false &&
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test_path_is_missing $rev &&
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test_index_pack true &&
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test_path_is_file $rev
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'
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test_expect_success 'index-pack with --[no-]rev-index' '
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for conf in "" true false
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do
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test_index_pack "$conf" --rev-index &&
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test_path_exists $rev &&
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test_index_pack "$conf" --no-rev-index &&
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test_path_is_missing $rev || return 1
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done
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'
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test_expect_success 'index-pack can verify reverse indexes' '
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test_when_finished "rm -f $rev" &&
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test_index_pack true &&
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test_path_is_file $rev &&
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git index-pack --rev-index --verify $packdir/pack-$pack.pack &&
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# Intentionally corrupt the reverse index.
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chmod u+w $rev &&
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printf "xxxx" | dd of=$rev bs=1 count=4 conv=notrunc &&
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test_must_fail git index-pack --rev-index --verify \
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$packdir/pack-$pack.pack 2>err &&
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grep "validation error" err
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'
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test_expect_success 'index-pack infers reverse index name with -o' '
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git index-pack --rev-index -o other.idx $packdir/pack-$pack.pack &&
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test_path_is_file other.idx &&
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test_path_is_file other.rev
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'
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test_expect_success 'pack-objects respects pack.writeReverseIndex' '
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test_when_finished "rm -fr pack-1-*" &&
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git -c pack.writeReverseIndex= pack-objects --all pack-1 &&
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test_path_is_missing pack-1-*.rev &&
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git -c pack.writeReverseIndex=false pack-objects --all pack-1 &&
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test_path_is_missing pack-1-*.rev &&
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git -c pack.writeReverseIndex=true pack-objects --all pack-1 &&
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test_path_is_file pack-1-*.rev
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'
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test_expect_success 'reverse index is not generated when available on disk' '
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test_index_pack true &&
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test_path_is_file $rev &&
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git rev-parse HEAD >tip &&
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GIT_TEST_REV_INDEX_DIE_IN_MEMORY=1 git cat-file \
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--batch-check="%(objectsize:disk)" <tip
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'
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test_expect_success 'reverse index is ignored when pack.readReverseIndex is false' '
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test_index_pack true &&
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test_path_is_file $rev &&
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test_config pack.readReverseIndex false &&
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git rev-parse HEAD >tip &&
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GIT_TEST_REV_INDEX_DIE_ON_DISK=1 git cat-file \
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--batch-check="%(objectsize:disk)" <tip
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'
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test_expect_success 'revindex in-memory vs on-disk' '
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git init repo &&
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test_when_finished "rm -fr repo" &&
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(
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cd repo &&
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test_commit commit &&
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git rev-list --objects --no-object-names --all >objects &&
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git -c pack.writeReverseIndex=false repack -ad &&
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test_path_is_missing $packdir/pack-*.rev &&
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git cat-file --batch-check="%(objectsize:disk) %(objectname)" \
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<objects >in-core &&
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git -c pack.writeReverseIndex=true repack -ad &&
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test_path_is_file $packdir/pack-*.rev &&
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git cat-file --batch-check="%(objectsize:disk) %(objectname)" \
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<objects >on-disk &&
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test_cmp on-disk in-core
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)
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'
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test_expect_success 'fsck succeeds on good rev-index' '
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test_when_finished rm -fr repo &&
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git init repo &&
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(
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cd repo &&
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test_commit commit &&
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git -c pack.writeReverseIndex=true repack -ad &&
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git fsck 2>err &&
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test_must_be_empty err
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)
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'
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test_expect_success 'set up rev-index corruption tests' '
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git init corrupt &&
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(
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cd corrupt &&
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test_commit commit &&
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git -c pack.writeReverseIndex=true repack -ad &&
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revfile=$(ls .git/objects/pack/pack-*.rev) &&
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chmod a+w $revfile &&
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cp $revfile $revfile.bak
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)
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'
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corrupt_rev_and_verify () {
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(
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pos="$1" &&
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value="$2" &&
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error="$3" &&
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cd corrupt &&
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revfile=$(ls .git/objects/pack/pack-*.rev) &&
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# Reset to original rev-file.
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cp $revfile.bak $revfile &&
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printf "$value" | dd of=$revfile bs=1 seek="$pos" conv=notrunc &&
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test_must_fail git fsck 2>err &&
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grep "$error" err
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)
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}
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test_expect_success 'fsck catches invalid checksum' '
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revfile=$(ls corrupt/.git/objects/pack/pack-*.rev) &&
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orig_size=$(wc -c <$revfile) &&
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hashpos=$((orig_size - 10)) &&
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corrupt_rev_and_verify $hashpos bogus \
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"invalid checksum"
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'
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test_expect_success 'fsck catches invalid row position' '
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corrupt_rev_and_verify 14 "\07" \
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"invalid rev-index position"
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'
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test_expect_success 'fsck catches invalid header: magic number' '
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corrupt_rev_and_verify 1 "\07" \
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"reverse-index file .* has unknown signature"
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'
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test_expect_success 'fsck catches invalid header: version' '
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corrupt_rev_and_verify 7 "\02" \
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"reverse-index file .* has unsupported version"
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'
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test_expect_success 'fsck catches invalid header: hash function' '
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corrupt_rev_and_verify 11 "\03" \
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"reverse-index file .* has unsupported hash id"
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'
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test_done
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