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| author |  Jeff Hostetler <jeffhost@microsoft.com> | 2017-04-14 20:32:21 +0000 |
|---|---|---|
| committer |  Junio C Hamano <gitster@pobox.com> | 2017-04-15 00:58:36 -0700 |
| commit | a33fc72fe911fdb8e284c94e08e8f1dafe4d3187 (patch) | |
| tree | cda596575083fbfb2ad1c30ad449926931abe669 /t | |
| parent | Ninth batch for 2.13 (diff) | |
| download | tgif-a33fc72fe911fdb8e284c94e08e8f1dafe4d3187.tar.xz | |
read-cache: force_verify_index_checksum
Teach git to skip verification of the SHA1-1 checksum at the end of
the index file in verify_hdr() which is called from read_index()
unless the "force_verify_index_checksum" global variable is set.
Teach fsck to force this verification.
The checksum verification is for detecting disk corruption, and for
small projects, the time it takes to compute SHA-1 is not that
significant, but for gigantic repositories this calculation adds
significant time to every command.
These effect can be seen using t/perf/p0002-read-cache.sh:
Test HEAD~1 HEAD
--------------------------------------------------------------------------------------
0002.1: read_cache/discard_cache 1000 times 0.66(0.44+0.20) 0.30(0.27+0.02) -54.5%
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 't')
| -rwxr-xr-x | t/t1450-fsck.sh | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/t/t1450-fsck.sh b/t/t1450-fsck.sh index 33a51c9a67..677e15a7a4 100755 --- a/t/t1450-fsck.sh +++ b/t/t1450-fsck.sh @@ -689,4 +689,17 @@ test_expect_success 'bogus head does not fallback to all heads' ' ! grep $blob out ' +test_expect_success 'detect corrupt index file in fsck' ' + cp .git/index .git/index.backup && + test_when_finished "mv .git/index.backup .git/index" && + echo zzzzzzzz >zzzzzzzz && + git add zzzzzzzz && + sed -e "s/zzzzzzzz/yyyyyyyy/" .git/index >.git/index.yyy && + mv .git/index.yyy .git/index && + # Confirm that fsck detects invalid checksum + test_must_fail git fsck --cache && + # Confirm that status no longer complains about invalid checksum + git status +' + test_done |