From: Russell King - ARM Linux <linux@arm.linux.org.uk>
Date: Sat, 04 Sep 2010 00:03:48 GMT
Subject: Re: [BUG?] rename patch accepted with --dry-run, rejected without (Re: [PATCH V3] arm & sh: factorised duplicated clkdev.c)
Message-ID: <20100904000348.GA7498@n2100.arm.linux.org.uk>
In-Reply-To: <20100903193309.GC29821@pengutronix.de>

On Fri, Sep 03, 2010 at 09:33:09PM +0200, Uwe Kleine-König wrote:
> > git patches include additional metadata for renaming files, which gnu patch
> > will not understand.
> > 
> > If you want GNU patch compatible diffs, don't use -C or -M when generating
> > patches out of git.
> Still GNU patch should then already fail in --dry-run mode.

And now look at the patch - it touches arch/sh/include/asm/clkdev.h twice.
Once to remove it and once as a rename.

GNU patch not in --dry-run mode will first remove arch/sh/include/asm/clkdev.h,
and then not have a file to deal with when it tries to patch the rename
part.  Whereas with --dry-run, the file stays around.

As I say, it's because GNU patch doesn't (currently) understand GIT
patches.  I wouldn't call that a bug in GNU patch.