mirror of
https://github.com/git/git
synced 2024-10-30 04:01:21 +00:00
ab292bc4f3
Stop emitting an error message when deleting a packed reference if we find another dangling packed reference that is overridden by a loose reference. See the previous commit for a longer explanation of the issue. We have to be careful to make sure that the invalid packed reference really *is* overridden by a loose reference; otherwise what we have found is repository corruption, which we *should* report. Please note that this approach is vulnerable to a race condition similar to the race conditions already known to affect packed references [1]: * Process 1 tries to peel packed reference X as part of deleting another packed reference. It discovers that X does not refer to a valid object (because the object that it referred to has been garbage collected). * Process 2 tries to delete reference X. It starts by deleting the loose reference X. * Process 1 checks whether there is a loose reference X. There is not (it has just been deleted by process 2), so process 1 reports a spurious error "X does not point to a valid object!" The worst case seems relatively harmless, and the fix is identical to the fix that will be needed for the other race conditions (namely holding a lock on the packed-refs file during *all* reference deletions), so we leave the cleaning up of all of them as a future project. [1] http://thread.gmane.org/gmane.comp.version-control.git/211956 Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Junio C Hamano <gitster@pobox.com>
154 lines
4.1 KiB
Bash
Executable file
154 lines
4.1 KiB
Bash
Executable file
#!/bin/sh
|
|
#
|
|
# Copyright (c) 2005 Amos Waterland
|
|
# Copyright (c) 2006 Christian Couder
|
|
#
|
|
|
|
test_description='git pack-refs should not change the branch semantic
|
|
|
|
This test runs git pack-refs and git show-ref and checks that the branch
|
|
semantic is still the same.
|
|
'
|
|
. ./test-lib.sh
|
|
|
|
echo '[core] logallrefupdates = true' >>.git/config
|
|
|
|
test_expect_success \
|
|
'prepare a trivial repository' \
|
|
'echo Hello > A &&
|
|
git update-index --add A &&
|
|
git commit -m "Initial commit." &&
|
|
HEAD=$(git rev-parse --verify HEAD)'
|
|
|
|
SHA1=
|
|
|
|
test_expect_success \
|
|
'see if git show-ref works as expected' \
|
|
'git branch a &&
|
|
SHA1=`cat .git/refs/heads/a` &&
|
|
echo "$SHA1 refs/heads/a" >expect &&
|
|
git show-ref a >result &&
|
|
test_cmp expect result'
|
|
|
|
test_expect_success \
|
|
'see if a branch still exists when packed' \
|
|
'git branch b &&
|
|
git pack-refs --all &&
|
|
rm -f .git/refs/heads/b &&
|
|
echo "$SHA1 refs/heads/b" >expect &&
|
|
git show-ref b >result &&
|
|
test_cmp expect result'
|
|
|
|
test_expect_success 'git branch c/d should barf if branch c exists' '
|
|
git branch c &&
|
|
git pack-refs --all &&
|
|
rm -f .git/refs/heads/c &&
|
|
test_must_fail git branch c/d
|
|
'
|
|
|
|
test_expect_success \
|
|
'see if a branch still exists after git pack-refs --prune' \
|
|
'git branch e &&
|
|
git pack-refs --all --prune &&
|
|
echo "$SHA1 refs/heads/e" >expect &&
|
|
git show-ref e >result &&
|
|
test_cmp expect result'
|
|
|
|
test_expect_success 'see if git pack-refs --prune remove ref files' '
|
|
git branch f &&
|
|
git pack-refs --all --prune &&
|
|
! test -f .git/refs/heads/f
|
|
'
|
|
|
|
test_expect_success 'see if git pack-refs --prune removes empty dirs' '
|
|
git branch r/s/t &&
|
|
git pack-refs --all --prune &&
|
|
! test -e .git/refs/heads/r
|
|
'
|
|
|
|
test_expect_success \
|
|
'git branch g should work when git branch g/h has been deleted' \
|
|
'git branch g/h &&
|
|
git pack-refs --all --prune &&
|
|
git branch -d g/h &&
|
|
git branch g &&
|
|
git pack-refs --all &&
|
|
git branch -d g'
|
|
|
|
test_expect_success 'git branch i/j/k should barf if branch i exists' '
|
|
git branch i &&
|
|
git pack-refs --all --prune &&
|
|
test_must_fail git branch i/j/k
|
|
'
|
|
|
|
test_expect_success \
|
|
'test git branch k after branch k/l/m and k/lm have been deleted' \
|
|
'git branch k/l &&
|
|
git branch k/lm &&
|
|
git branch -d k/l &&
|
|
git branch k/l/m &&
|
|
git branch -d k/l/m &&
|
|
git branch -d k/lm &&
|
|
git branch k'
|
|
|
|
test_expect_success \
|
|
'test git branch n after some branch deletion and pruning' \
|
|
'git branch n/o &&
|
|
git branch n/op &&
|
|
git branch -d n/o &&
|
|
git branch n/o/p &&
|
|
git branch -d n/op &&
|
|
git pack-refs --all --prune &&
|
|
git branch -d n/o/p &&
|
|
git branch n'
|
|
|
|
test_expect_success \
|
|
'see if up-to-date packed refs are preserved' \
|
|
'git branch q &&
|
|
git pack-refs --all --prune &&
|
|
git update-ref refs/heads/q refs/heads/q &&
|
|
! test -f .git/refs/heads/q'
|
|
|
|
test_expect_success 'pack, prune and repack' '
|
|
git tag foo &&
|
|
git pack-refs --all --prune &&
|
|
git show-ref >all-of-them &&
|
|
git pack-refs &&
|
|
git show-ref >again &&
|
|
test_cmp all-of-them again
|
|
'
|
|
|
|
test_expect_success 'explicit pack-refs with dangling packed reference' '
|
|
git commit --allow-empty -m "soon to be garbage-collected" &&
|
|
git pack-refs --all &&
|
|
git reset --hard HEAD^ &&
|
|
git reflog expire --expire=all --all &&
|
|
git prune --expire=all &&
|
|
git pack-refs --all 2>result &&
|
|
test_cmp /dev/null result
|
|
'
|
|
|
|
test_expect_success 'delete ref with dangling packed version' '
|
|
git checkout -b lamb &&
|
|
git commit --allow-empty -m "future garbage" &&
|
|
git pack-refs --all &&
|
|
git reset --hard HEAD^ &&
|
|
git checkout master &&
|
|
git reflog expire --expire=all --all &&
|
|
git prune --expire=all &&
|
|
git branch -d lamb 2>result &&
|
|
test_cmp /dev/null result
|
|
'
|
|
|
|
test_expect_success 'delete ref while another dangling packed ref' '
|
|
git branch lamb &&
|
|
git commit --allow-empty -m "future garbage" &&
|
|
git pack-refs --all &&
|
|
git reset --hard HEAD^ &&
|
|
git reflog expire --expire=all --all &&
|
|
git prune --expire=all &&
|
|
git branch -d lamb 2>result &&
|
|
test_cmp /dev/null result
|
|
'
|
|
|
|
test_done
|