Date:	Wed, 28 Nov 2007 20:10:52 +0100
From:	willem <wli222@...ema.nl>
To:	Dave Quigley <dpquigl@...ho.nsa.gov>
CC:	Tilman Schmidt <tilman@...p.cc>,
	Jan Engelhardt <jengelh@...putergmbh.de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: git guidance

Dave Quigley wrote:
> On Wed, 2007-11-28 at 16:57 +0100, Tilman Schmidt wrote:
>   
>> Dave Quigley schrieb:
>>     
>>> There is a project listed on the kernel.org git page called guilt. I
>>> find it very useful. It is much more responsive than stgit and it
>>> actually has a git backend which quilt does not.
>>>
>>> On Wed, 2007-11-28 at 00:20 +0100, Jan Engelhardt wrote:
>>>       
>>>> On Nov 27 2007 23:33, Tilman Schmidt wrote:
>>>>         
>>>>> Well, it did. So now I'm back to keeping a virgin kernel source tree
>>>>> alongside my development area in order to produce diffs. That can't
>>>>> be right?
>>>>>
>>>>>           
>>>> No, it can't. Use stgit/quilt ;p
>>>>         
>> In which respect would stgit/quilt/guilt help me? At first glance
>> they just seem to add another level of complexity.
>>
>> Thanks,
>> Tilman
>>
>>     
>
> These tools allow you to maintain a set of patches with very little
> effort. More importantly it removes a lot of the git specifics from your
> development process. For example this is how I use guilt for a new patch
> set.
>
> I take my fresh tree and do a guilt-init in the base. This will create a
> new patch series. I then need to create a patch to modify something LSM
> related (guilt-new <patch_name>). Things like stgit/quilt/git use the
> idea of a stack of patches. At this point if you were to type
> guilt-series you would only see the one patch we just created. This
> patch is going to be one logical set of changes (it should also produce
> a compilable and working kernel). You can make whatever modifications
> you need to make to your files and at this point you need to do one of
> two things. If they were already in the tree you just type guilt-refresh
> and under your .git/patches/<branch_name> directory you will see a file
> named <patch_name> which contains your patch. Otherwise you need to do a
> guilt-add <file_name> and then a guilt-refresh. The idea here is that
> you have a moved your workflow from managing a series of commits and
> then breaking out patches from a final version to one where you think in
> terms of the patches and make modifications to them instead. In my
> example I said I was doing something LSM related. Lets say the first
> patch added a new hook and its implementation in the various modules. We
> can now add a second patch using the guilt-new command and this one will
> add uses of that new hook. At this point we have a stack that looks like
> this.
>
> <patch that adds users>
> <patch that adds hook>
>
> I can pop and push patches onto this stack to have a version of my
> kernel tree at any state within the patch set. At this point lets say we
> have posted the patch set and have feedback. I need to apply this
> feedback to the patch that adds the LSM hook. Since my top patch
> (guilt-top) is currently at the one that adds the users of the hook I
> need to pop off that patch and get to the one that creates the hook
> (guilt-pop). After doing this I'm at a kernel tree state which just has
> the changes which add the hook. I make my modifications, type
> guilt-refresh to create a new patch and then guilt-push my second patch
> on and make sure everything is still working.
>
> As you can see there is almost no git knowledge required to use this
> system and it allows you to focus on development instead of the
> versioning system. One useful feature is that when Linus adds new
> patches and I want to rebase my set against the current tree It only
> takes 3 commands to rebase the patch set (Assuming all goes well).
>
> guilt-push -a #push all patches onto the stack
> git-fetch #pull down the index
> guilt-rebase FETCH_HEAD #Rebase our patches should do a merge and
> #reapply all patches
>
> These are just some basics about guilt. Jeff has written a better
> tutorial with a sample repository for you to work with if your
> interested. I don't know if this will help your development process but
> I can tell you from experience breaking patches by hand was a pain in
> the ass and a huge waste of time and I'm glad to have a tool like this
>   
Where can I find that tutorial ?

regards
> now.
>
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>   

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