Re: [PATCH/RFC 04/20] rebase: remove unused rebase state 'prev_head'

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Michael J Gruber <git@xxxxxxxxxxxxxxxxxxxx> writes:

> Martin von Zweigbergk venit, vidit, dixit 25.11.2010 20:57:
>> The rebase state 'prev_head' is not used. Remove it.
>> 
>> Signed-off-by: Martin von Zweigbergk <martin.von.zweigbergk@xxxxxxxxx>
>> ---
>
> The actual value of prev_head was never used. But the check for its
> non-nullness made sure that git-rev-parse HEAD^0 succeeded when
> $merge_dir was created. Have you made sure that we don't need that check?

I think we are Ok.

It was a bit sloppy of 9e4bc7d (rebase: cleanup rebasing with --merge,
2006-06-24) to use the output from `git-rev-parse HEAD^0`, which would
give you "HEAD^0" as string when HEAD does not exist.  Even though the
command itself will exit with non-zero status, the exit status was never
checked.  After 9e4bc7d (rebase: cleanup rebasing with --merge,
2006-06-24), we didn't seem to have any reason to use $prev_head, iow,
this change was probably way overdue.
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