Re: [PATCH] rebase: write script before initializing state

> If rebase.instructionFormat is invalid the repository is left in a
> strange state when the interactive rebase fails. `git status` outputs
> boths the same as it would in the normal case *and* something related to
> interactive rebase:
>
>     $ git -c rebase.instructionFormat=blah rebase -i
>     fatal: invalid --pretty format: blah
>     $ git status
>     On branch master
>     Your branch is ahead of 'upstream/master' by 1 commit.
>       (use "git push" to publish your local commits)
>
>     git-rebase-todo is missing.
>     No commands done.
>     No commands remaining.
>     You are currently editing a commit while rebasing branch 'master' on '8db3019401'.
>       (use "git commit --amend" to amend the current commit)
>       (use "git rebase --continue" once you are satisfied with your changes)
>
> By attempting to write the rebase script before initializing the state
> this potential scenario is avoided.
> ---
> The diff looks perhaps more messy than required. The only required
> change is the filling in of make_script_args and the call to
> sequencer_make_script() above the call to init_basic_state(). But then
> the `if (ret)` looks out of place, and moving that up means adding `goto
> cleanup` which means the code that was previously the else case can be
> dedented.
>
> get_commit_format() calls die() in this case, so cleaning up the
> sequencer state isn't an option. Maybe it shouldn't call die in the
> first place, but that looks to be much larger change.