Subject: Re: [RFC/PATCH] Re: git submodule -b ... of current HEAD fails

From: Jens Lehmann <[email-masked]>
Date: Thu, 02 Dec 2010 22:11:13 +0100

Am 01.12.2010 19:50, schrieb Jonathan Nieder:
> 	git submodule add -b $branch $repository
> 
> fails when HEAD already points to $branch in $repository.
> 
> Reported-by: Klaus Ethgen <[email-masked]>
> Signed-off-by: Jonathan Nieder <[email-masked]>
> ---
> Hi Klaus,
> 
> Klaus Ethgen wrote at <http://bugs.debian.org/605600>:
> 
>> Strange problem, if I create a submodule of an other repository giving
>> the currently used HEAD branch I get the error: »fatal: git checkout:
>> branch myimbabranch already exists« while when giving other branch
>> work well.
> 
> Interesting.  The problem is in cmd_add of git-submodule.sh; this
> patch demonstrates a quick fix.  Jens, any idea why git submodule
> is not using "clone --branch" directly?

Nope, these lines date back to the time before I got involved in the
submodule business ... Seems like this "git checkout" was added in
March 2008 by Mark Levedahl (CCed), maybe he can shed some light on
that.

But to me your change looks good, so feel free to add:
Acked-by: Jens Lehmann <[email-masked]>

> diff --git a/git-submodule.sh b/git-submodule.sh
> index 33bc41f..6242d7f 100755
> --- a/git-submodule.sh
> +++ b/git-submodule.sh
> @@ -241,7 +241,7 @@ cmd_add()
>  			# ash fails to wordsplit ${branch:+-b "$branch"...}
>  			case "$branch" in
>  			'') git checkout -f -q ;;
> -			?*) git checkout -f -q -b "$branch" "origin/$branch" ;;
> +			?*) git checkout -f -q -B "$branch" "origin/$branch" ;;
>  			esac
>  		) || die "Unable to checkout submodule '$path'"
>  	fi
>