Re: [PATCH] rebase --interactive: Compute upstream SHA1 before switching branches

> Johannes Schindelin <Johannes.Schindelin@gmx.de> writes:
> 
> >> BTW, methinks, this checkout is unnecessary, since before the rebase 
> >> begins, there is a 'git checkout $ONTO', and the branch switching is 
> >> certainly not needed to compute the todo list...
> >
> > It is needed to determine which branch to update after finish.
> 
> I'll apply Hannes's patch for now as I do not want to leave an obvious fix
> out of -rc1.
> 
> I think Hannes is referring to the same issue as the one dealt with with
> 0cb0664 (rebase [--onto O] A B: omit needless checkout, 2008-03-15) for
> the non-interactive codepath.
> 
> You certainly "need to determine which branch to update after finish", 
> and you do need to remember what branch you were on (if you were not 
> called with the <branch> parameter), or what branch were given from the 
> command line (if you got one as <branch> parameter) in order to do so, 
> but the way to remember these values does not have to involve an extra 
> checkout.
> 
> By doing an extra checkout of "the original HEAD", before switching to a 
> detached HEAD state at the $ONTO commit to "clean the slate" to apply 
> the sequence on top, more work tree entries will be smudged, forcinging 
> more recompilations than necessary if the tracked contents are "source" 
> files.