Re: [PATCH 12/14] revert: Introduce --reset to cleanup sequencer data

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Ramkumar Ramachandra wrote:

>> --- a/t/t3507-cherry-pick-conflict.sh
>> +++ b/t/t3507-cherry-pick-conflict.sh
[...]
> As you can see, there is no "reset --hard" in these

In this one, there's "git checkout -f && git read-tree -u --reset HEAD
&& git clean -fdx", which is almost the same thing.

>> --- a/t/t3505-cherry-pick-empty.sh
>> +++ b/t/t3505-cherry-pick-empty.sh

This one is not a typical script, I think --- if you knew the
cherry-pick was going to be empty, why did you try it in the first
place?  I think it would make sense to make it "git reset --hard" at
the beginning of each test as a separate, preparatory patch with
explanation.

[...]
> There is however, one other thing I can do: if there is
> nothing left to cherry-pick after a successful conflict resolution +
> git commit, I can modify commit.c to blow away the sequencer state
> after checking appropriately.  This will also have a nice end-user
> experience side-effect:
> $ git cherry-pick moo
> fatal: Conflict in foo!
> $ echo "Resolved" > foo
> $ git add moo
> $ git commit
> $ git cherry-pick --continue # This no-op will be unnecessary

Though it's not obvious to me how this would affect the scripts above,
it sounds like a nice enhancement to me independently, fwiw.

> Then again, teaching commit about the sequencer is inelegant,

It's possible to add some hook-like thing to do this, or to structure
the code as if a hook was used.

> and it's
> possible to achieve this effect in another way: when a conflict is
> encountered in the sequencer && length(todo_file) == 1, throw away the
> sequencer state.

Yep, that seems like basically the same effect.  Are there downsides?
(Maybe years from now when a "git cherry-pick --rewind" is introduced
we would regret this?  But that can be figured out years from now.)
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