linux-kernel - Re: merging other repos into linux-2.6

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Date:	Fri, 31 Oct 2008 08:57:45 -0400
From:	"J.R. Mauro" <jrm8005@...il.com>
To:	"Kyle Moffett" <kyle@...fetthome.net>
Cc:	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Greg KH" <greg@...ah.com>, linux-kernel@...r.kernel.org
Subject: Re: merging other repos into linux-2.6

On Fri, Oct 31, 2008 at 12:08 AM, Kyle Moffett <kyle@...fetthome.net> wrote:
> On Thu, Oct 30, 2008 at 10:38 PM, J.R. Mauro <jrm8005@...il.com> wrote:
>> I agree. The only viable automated approach would be something akin to
>> git-submodule but with the ability to integrate the submodule'd
>> project upon import in such a way that things like bisection would
>> follow the main project's ancestry and ignore the submodule's. But
>> that's not possible right now and probably won't be in the foreseeable
>> future.
>
> Here's one relatively easy solution:
>
> (1)  Fetch the to-be-merged branch of the "child" project into a
> repository with the parent project ($KIDBRANCH)
>
> (2)  Find a branch on which you are going to rebase the child
> project's history ($BASEBRANCH)
>
> (3)  Determine a directory into which you are going to put the child
> project's history ($SUBDIR)
>
> (4)  Identify the first revision of the child project by looking at
> the last (first-in-time) entry in "git log" of that branch.
> ($KIDSTART)
>
> (5)  Graft the kid's history onto the parent's history at that point:
> echo "$KIDSTART $(git rev-parse --verify $BASEBRANCH)" >.git/info/grafts
>
> (6)  Rewrite the kid's history as a subdir of that version of the parent:
> git filter-branch --index-filter 'git read-tree master && git
> read-tree --prefix=drivers/newkiddriver/ "$GIT_COMMIT"' --
> "$BASEBRANCH..$KIDBRANCH"
>
> Now the history of $KIDBRANCH will appear to be a series of commits
> which add files in $SUBDIR of the parent project, without any changes
> at all to the parent project's tree.  You can then do a merge of what
> appears to be a normal development branch into the main repository.
>
> Since none of the files are even remotely referenced, there can be no
> possible build failures (hence bisection is not broken).  You may then
> add commits which add Kconfig options and Makefile references and
> happily develop away.
>
> Cheers,
> Kyle Moffett
>


So this would keep their history but make it look like their first
commit (years ago) happened today? Or do I misunderstand you?

If it is, this is basically what I was trying to propose, except I
didn't have nearly enough git-fu to put it like that.

But then if Greg thinks the history is rubbish, I doubt it will get
imported, although I think these methods are worth experimenting with
for the future.

~J.R.
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