Re: Problems with ra/rebase-i-more-options - should we revert it?

Hi Dscho

On 12/01/2020 18:41, Johannes Schindelin wrote:

Hi Phillip,

On Sun, 12 Jan 2020, Phillip Wood wrote:

quoted

On 12/01/2020 16:12, Phillip Wood wrote:

quoted

I'm concerned that there are some bugs in this series and think
it may be best to revert it before releasing 2.25.0. Jonathan
Nieder posted a bug report on Friday [1] which I think is caused
by this series. While trying to reproduce Jonathan's bug I came
up with the test below which fails, but not in the same way.

Thank you so much for your thoughts and your work on this. For what it's
worth, I totally agree with your assessment and your suggestion to revert
those patches _before_ releasing v2.25.0. (I seem to remember vaguely that
there were repeated requests for better test coverage and that those
requests went unaddressed, so I would not be surprised if there were more
unfortunate surprises waiting for us.)

Yes there were more surprises - when we fork `git merge` 
--committer-date-is-author-date is broken. That was tested but with a 
commit where the author date was the current time so it did not detect 
the failure.

[...]

quoted

--- >8 ---
diff --git a/sequencer.c b/sequencer.c
index 763ccbbc45..22a38de47b 100644
--- a/sequencer.c
+++ b/sequencer.c

@@ -988,7 +988,7 @@ static int run_git_commit(struct repository *r,
                 if (!date)
                         return -1;

-               strbuf_addf(&datebuf, "@%s", date);
+               strbuf_addf(&datebuf, "%s", date);

I have to admit that I have not analyzed the code before this hunk (it
would be much easier to increase the context in a non-static reviewing
environment, e.g. on GitHub, but the mailing list does not allow for
that), so I do not know just _how_ likely our `date` here is going to
change or remain prefixed by a `@`. Therefore, this suggestion might be
totally stupid: `"@%s", date + (*date == '@')`

The date was read from the author-script so I think we should leave it 
as is in case the user has edited it and is using a different date 
format. Having said that I'm keen to make a bigger change to Rohit's 
implementation and just get the author date out of the argv_array 
holding the child's environment as this avoids re-reading the 
author-script file. It has taken a bit longer than I planned so it'll be 
next week before I post the fixes.

Best Wishes

Phillip

Thanks again,
Dscho

quoted

                 res = setenv("GIT_COMMITTER_DATE",
                              opts->ignore_date ? "" : datebuf.buf, 1);

quoted

The
test coverage of this series has always been pretty poor and I
think it needs improving for us to have confidence in it. I'm
also concerned that at least one of the
tests ('--committer-date-is-author-date works with rebase -r')
does not detect failures properly in the code below

	while read HASH
	do
		git show $HASH --pretty="format:%ai" >authortime
		git show $HASH --pretty="format:%ci" >committertime
		test_cmp authortime committertime
	done <rev_list


Best Wishes

Phillip

[1] https://lore.kernel.org/git/20200110231436.GA24315@google.com/ (local)

--- >8 ---
diff --git a/t/t3433-rebase-options-compatibility.sh b/t/t3433-rebase-options-compatibility.sh
index 5166f158dd..c81e1d7167 100755
--- a/t/t3433-rebase-options-compatibility.sh
+++ b/t/t3433-rebase-options-compatibility.sh

@@ -6,6 +6,7 @@
   test_description='tests to ensure compatibility between am and interactive backends'

   . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-rebase.sh

   GIT_AUTHOR_DATE="1999-04-02T08:03:20+05:30"
   export GIT_AUTHOR_DATE

@@ -99,6 +100,22 @@ test_expect_success '--committer-date-is-author-date works with rebase -r' '
          done <rev_list
   '

+test_expect_success '--committer-date-is-author-date works when committing conflict resolution' '
+       git checkout commit2 &&
+       (
+               set_fake_editor &&
+               FAKE_LINES=2 &&
+               export FAKE_LINES &&
+               test_must_fail git rebase -i HEAD^^
+       ) &&
+       echo resolved > foo &&
+       git add foo &&
+       git rebase --continue &&
+       git log -1 --format=%at commit2 >expect &&
+       git log -1 --format=%ct HEAD >actual &&
+       test_cmp expect actual
+'
+
   # Checking for +0000 in author time is enough since default
   # timezone is UTC, but the timezone used while committing
   # sets to +0530.