Re: [PATCH] git-subtree.sh: Use --allow-unrelated-histories when splitting with --rejoin

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[cc'd Roberto for submitGit q's]

On Thu, Jul 21, 2016 at 12:56:51AM +0000, Brett Cundal wrote:
> ---

<emtpy commit message>

The message on the pull request[1] has a better justification
for this change, which would have been nice in the commit
message itself:


	Git 2.9 added a check against merging unrelated histories, which
	is exactly what git subtree with --rejoin does. Adding the
	--allow-unrelated-histories flag to merge will override this
	check.


Is it possible that maybe submitGit can detect an empty commit
message for single-commit PRs and transplant that message onto it?

As-is, the commit itself should probably be amended to contain
that information.

>  contrib/subtree/git-subtree.sh | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/contrib/subtree/git-subtree.sh b/contrib/subtree/git-subtree.sh
> index 7a39b30..556cd92 100755
> --- a/contrib/subtree/git-subtree.sh
> +++ b/contrib/subtree/git-subtree.sh
> @@ -661,7 +661,7 @@ cmd_split()
>  	if [ -n "$rejoin" ]; then
>  		debug "Merging split branch into HEAD..."
>  		latest_old=$(cache_get latest_old)
> -		git merge -s ours \
> +		git merge -s ours --allow-unrelated-histories \
>  			-m "$(rejoin_msg "$dir" $latest_old $latest_new)" \
>  			$latest_new >&2 || exit $?
>  	fi
> 
> --

With the above description this change makes more sense,
but it seems that the existing tests do not detect the breakage
fixed by this patch.

Can you please add a test case in t/t7900-subtree.sh
demonstrating the breakage?

Looks good otherwise.

[1] https://github.com/git/git/pull/274
-- 
David
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