# git 2.9 subtree split with rejoin

2 messages from 2016-07-31 to 2016-07-31. Participants: Sylvain Garrigues, Jakub Narębski.
Thread: https://gitlist.dev/t/42980

## Sylvain Garrigues, 2016-07-31 14:32

Subject: git 2.9 subtree split with rejoin
Message-ID: <1BED74C8-2E4C-4CA7-B785-F0666B69C1A7@gmail.com>
URL: https://gitlist.dev/e/1BED74C8-2E4C-4CA7-B785-F0666B69C1A7%40gmail.com

```
Hello,

It seems now with 2.9 you cannot use git subtree split —rejoin without —onto otherwise you get:
fatal: refusing to merge unrelated histories

I wish I could pass --allow-unrelated-histories but that doesn’t work.

Adding —onto makes the split operation much much longer. Could we make a bug fix which allow to pass the --allow-unrelated-histories flag to subtree split?

Thanks,
Sylvain.


```

## Jakub Narębski, 2016-07-31 17:32

Subject: Re: git 2.9 subtree split with rejoin
Message-ID: <ddf95185-0b87-b81b-6583-6e0aab5a6b5a@gmail.com>
URL: https://gitlist.dev/e/ddf95185-0b87-b81b-6583-6e0aab5a6b5a%40gmail.com
In-Reply-To: <1BED74C8-2E4C-4CA7-B785-F0666B69C1A7@gmail.com>

```
W dniu 31.07.2016 o 16:32, Sylvain Garrigues pisze:
> Hello,
> 
> It seems now with 2.9 you cannot use git subtree split —rejoin
> without —onto otherwise you get:
>    fatal: refusing to merge unrelated histories
> 
> I wish I could pass --allow-unrelated-histories but that doesn’t
> work.
> 
> Adding —onto makes the split operation much much longer. Could we
> make a bug fix which allow to pass the --allow-unrelated-histories
> flag to subtree split?

This should be soon in 'master', you can check it in 'next',
and I think it would be present in the new release.

From "What's cooking in git.git (Jul 2016, #09; Fri, 29)":
--------------------------------------------------------------------
[Cooking]

* da/subtree-2.9-regression (2016-07-26) 2 commits
  (merged to 'next' on 2016-07-26 at 9d71562)
 + subtree: fix "git subtree split --rejoin"
 + t7900-subtree.sh: fix quoting and broken && chains
 (this branch is used by da/subtree-modernize.)

 "git merge" in Git v2.9 was taught to forbid merging an unrelated
 lines of history by default, but that is exactly the kind of thing
 the "--rejoin" mode of "git subtree" (in contrib/) wants to do.
 "git subtree" has been taught to use the "--allow-unrelated-histories"
 option to override the default.

 Will merge to 'master'.


```