Re: Cherry-pick dangles and forgets helpful advice in next

[Junio C Hamano <gitster@pobox.com>]

Phil Hord <hordp@cisco.com> writes:

> In git.git 'master' when I cherry-pick a commit which is eventually
> empty, git gives me a friendly description of my supposed error, leaves
> my cherry-pick "pending" and exits with an error code.
>
>
> $ git cherry-pick a0aff2d                          
> # On branch master
> nothing to commit (working directory clean)
> The previous cherry-pick is now empty, possibly due to conflict resolution.
> If you wish to commit it anyway, use:
>
>     git commit --allow-empty
>
> Otherwise, please use 'git reset'
>
> In 'next' this is broken.  Now git does not tell me anything and it does
> not exit with an error code.

There probably is something else that is broken in _your_ build.  The test
t3505.2 is about failing an attempt to cherry-pick an empty commit:

        test_expect_success 'cherry-pick an empty commit' '
                git checkout master && {
                        git cherry-pick empty-branch^
                        test "$?" = 1
                }
        '

If I insert an "exit" immediately after this test and run the test with
"-i -v" option, it ends like this:

    $ make && cd t && sh t3505-cherry-pick-empty.sh -i -v
    ...
    ok 1 - setup

    expecting success:
            git checkout master && {
                    git cherry-pick empty-branch^
                    test "$?" = 1
            }

    Switched to branch 'master'
    Already up-to-date!
    # On branch master
    nothing to commit (working directory clean)
    The previous cherry-pick is now empty, possibly due to conflict
    resolution.
    If you wish to commit it anyway, use:

        git commit --allow-empty

    Otherwise, please use 'git reset'
    ok 2 - cherry-pick an empty commit

    FATAL: Unexpected exit with code 0

It does fail with non-zero exit code (it might be better to test with
test_expect_failure, but that is a minor point here), and we see the error
message.