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

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Hi Brett,

On Thu, 21 Jul 2016, Brett Cundal wrote:

> [re-sending as plain-text so the list software doesn't reject as
> spam... what decade is this?]

I know it feels good to get frustration off of your chest by ranting. I am
very sympathetic to that. Please note, however, that it puts the people
who are ready to help you immediately into a defensive corner. Probably
unintentional?

> Sorry about the empty commit message... there was one originally (albeit
> not as detailed as the pull request), but I guess it got stripped? As
> you have probably guessed, I have no idea how you guys do patch
> submission.

It is okay. For historical reasons, the patch submission is a bit more
involved than simply opening a Pull Request. We also frown upon
top-posting, among other rules of netiquette. You may dislike it, but you
would have to build more of a "street cred" if you truly wanted to try to
convince the Git developers to change it.

Back to the patch you wanted to submit: since this is an important bug
fix, I spent the time to clean it up. The only missing bit that requires
further effort from your side is that we need your Sign-off. See
https://github.com/git/git/blob/v2.9.2/Documentation/SubmittingPatches#L239-L291
for an explanation. Essentially, you are stating explicitly that you are
not legally prohibited from contributing this patch. If you can say that,
simply reply with a

	Signed-off-by: Brett Cundal <brett.cundal@xxxxxxxxxx>

We can take it from there by inserting it into the following patch:

-- snipsnap --
From: Brett Cundal <brett.cundal@xxxxxxxxxx>
Subject: [PATCH] subtree: allow unrelated histories when splitting with --rejoin

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.
---
 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
-- 
2.9.0.281.g286a8d9


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