Re: [PATCH] rebase -i: only automatically amend commit if HEAD did not change

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

Johannes Schindelin <Johannes.Schindelin@gmx.de> writes:

> If the user called "rebase -i", marked a commit as "edit", "rebase
> --continue" would automatically amend the commit when there were
> staged changes.
>
> However, this is actively wrong when the current commit is not the
> one marked with "edit".  So guard against this.

At what point in what valid workflow sequence does HEAD become different
from dotest/amend?

> @@ -419,7 +419,9 @@ do
>  		else
>  			. "$DOTEST"/author-script ||
>  				die "Cannot find the author identity"
> -			if test -f "$DOTEST"/amend
> +			if test -f "$DOTEST"/amend &&
> +				test $(git rev-parse HEAD) = \
> +					$(cat "$DOTEST"/amend)
>  			then
>  				git reset --soft HEAD^ ||
>  				die "Cannot rewind the HEAD"

In what way is this "guarding against it"?  It goes on and makes an
unrelated commit without erroring out nor giving indication to the user
what is going on, doesn't it?

I am sure you meant well and the code is good, but I find that the
explanation is a bit lacking...