On Fri, Sep 21 2018, Junio C Hamano wrote:
> * ds/reachable (2018-08-28) 19 commits
> (merged to 'next' on 2018-08-28 at b1634b371d)
> + commit-reach: correct accidental #include of C file
> (merged to 'next' on 2018-08-22 at 17f3275afb)
> + commit-reach: use can_all_from_reach
> + commit-reach: make can_all_from_reach... linear
> + commit-reach: replace ref_newer logic
> + test-reach: test commit_contains
> + test-reach: test can_all_from_reach_with_flags
> + test-reach: test reduce_heads
> + test-reach: test get_merge_bases_many
> + test-reach: test is_descendant_of
> + test-reach: test in_merge_bases
> + test-reach: create new test tool for ref_newer
> + commit-reach: move can_all_from_reach_with_flags
> + upload-pack: generalize commit date cutoff
> + upload-pack: refactor ok_to_give_up()
> + upload-pack: make reachable() more generic
> + commit-reach: move commit_contains from ref-filter
> + commit-reach: move ref_newer from remote.c
> + commit.h: remove method declarations
> + commit-reach: move walk methods from commit.c
>
> The code for computing history reachability has been shuffled,
> obtained a bunch of new tests to cover them, and then being
> improved.
There's a segfault now in master when fetching because of 4fbcca4eff
("commit-reach: make can_all_from_reach... linear", 2018-07-20). I have
not had time to debug this, or found an easy isolated test case, but
this script will reliably make it segfault for me:
#!/bin/sh
git_dot_git=/home/avar/g/git
old=v0.99
new=v0.99.1
rm -rf /tmp/srv
rm -rf /tmp/cln
git init --bare /tmp/srv
git init --bare /tmp/cln
$git_dot_git/git --exec-path=$git_dot_git push file:///tmp/srv $old:refs/whatever/ref
$git_dot_git/git --exec-path=$git_dot_git -C /tmp/cln fetch file:///tmp/srv 'refs/*:refs/*'
$git_dot_git/git --exec-path=$git_dot_git push file:///tmp/srv $new:refs/whatever/ref
if GIT_TRACE=1 $git_dot_git/git --exec-path=$git_dot_git -C /tmp/cln fetch file:///tmp/srv 'refs/*:refs/*'
then
exit 0
else
exit 1
fi
I.e. you need to push the v0.99 tag to its own repo, fetch that from
another one, then push v0.99.1, fetch everything, and you'll get a
segfault:
remote: Resolving deltas: 100% (187/187), completed with 48 local objects.
To file:///tmp/srv
d6602ec519..f25a265a34 v0.99.1 -> refs/whatever/ref
14:26:44.505787 git.c:415 trace: built-in: git fetch file:///tmp/srv 'refs/*:refs/*'
14:26:44.506708 run-command.c:637 trace: run_command: unset GIT_DIR GIT_IMPLICIT_WORK_TREE GIT_PREFIX; 'git-upload-pack '\''/tmp/srv'\'''
14:26:44.508831 git.c:415 trace: built-in: git upload-pack /tmp/srv
14:26:44.509953 run-command.c:637 trace: run_command: git rev-list --objects --stdin --not --all --quiet
Segmentation fault
fatal: The remote end hung up unexpectedly
Same with refs/tags/ref b.t.w., not just refs/whatever/ref, I just was
initially testing this for some follow-up work on my series for checking
how fetching to various non-heads/tags namespaces works.
