[U-Boot] Banner -> git co target?

[Tom Rini]

On Mon, Apr 01, 2013 at 04:07:56PM +0200, Anatolij Gustschin wrote:
> Hello,
> 
> On Mon, 1 Apr 2013 09:16:06 -0400
> Michael Cashwell <mboards at prograde.net> wrote:
> 
> > Greetings,
> > 
> > My u-boot work area got messed up recently when I pulled from master. I'm having trouble figuring out what's wrong.
> > 
> > I have this banner "U-Boot SPL 2013.04-rc1-00024-ga268170-dirty (Mar 15 2013 - 10:24:41)" from a recently working state. A corresponding banner that's broken for me is "U-Boot SPL 2013.04-rc1-00292-g417c558-dirty (Apr 01 2013 - 08:10:25)"

Note that in both of these cases "-dirty" means that you have
uncommitted local changes.

> > I'd like to go through and methodically compare these two but I can't figure out what git command would rewind the work area back to a state that corresponds to a known u-boot banner.
> > 
> > I assume the key bits are "00024-ga268170" but I expect I need a commit ID or branch name and that doesn't seem to be either.
> > 
> > Any pointers?
> 
> Commit ID is "a268170" (remove 'g'), with 24 new patches committed
> after v2013.04-rc1 tag. So
> 
>   git checkout -b working-state a268170
> 
> should work.

And to try and track things do you can do:
$ git stash save "My changes to do..."
$ git bisect start
$ git bisect good a268170
$ git bisect bad

And then 'git bisect good' or 'git bisect bad' as a particular revision
works or fails.  If you need the local changes to boot your platform,
you can do a git stash pop to apply your local changes on top of the new
rev, build, git stash save (without a "describe the changes string" git
stash still saves your changes, it just doesn't have a helpful a month
later string telling you what you did, just what rev you have stashed
changes on top of).

-- 
Tom
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