Re: [Qemu-devel] [PULL 44/50] scripts: let checkpatch.pl process an entire GIT branch

["Daniel P. Berrange" <berrange@redhat.com>]

On Tue, Oct 03, 2017 at 04:07:06PM -0600, Alex Williamson wrote:
> On Tue, 19 Sep 2017 14:29:33 +0200
> Paolo Bonzini <pbonzini@redhat.com> wrote:
> 
> > From: "Daniel P. Berrange" <berrange@redhat.com>
> > 
> > Currently before submitting a series, devs should run checkpatch.pl
> > across each patch to be submitted. This can be automated using a
> > command such as:
> > 
> >   git rebase -i master -x 'git show | ./scripts/checkpatch.pl -'
> > 
> > This is rather long winded to type, so this patch introduces a way
> > to tell checkpatch.pl to validate a series of GIT revisions.
> > 
> > There are now three modes it can operate in 1) check a patch 2) check a source
> > file, or 3) check a git branch.
> > 
> > If no flags are given, the mode is determined by checking the args passed to
> > the command. If the args contain a literal ".." it is treated as a GIT revision
> > list. If the args end in ".patch" or equal "-" it is treated as a patch file.
> > Otherwise it is treated as a source file.
> > 
> > This automatic guessing can be overridden using --[no-]patch --[no-]file or
> > --[no-]branch
> > 
> > For example to check a GIT revision list:
> > 
> >     $ ./scripts/checkpatch.pl master..
> >     total: 0 errors, 0 warnings, 297 lines checked
> > 
> >     b886d352a2bf58f0996471fb3991a138373a2957 has no obvious style problems and is ready for submission.
> >     total: 0 errors, 0 warnings, 182 lines checked
> > 
> >     2a731f9a9ce145e0e0df6d42dd2a3ce4dfc543fa has no obvious style problems and is ready for submission.
> >     total: 0 errors, 0 warnings, 102 lines checked
> > 
> >     11844169bcc0c8ed4449eb3744a69877ed329dd7 has no obvious style problems and is ready for submission.
> > 
> > If a genuine patch filename contains the characters '..' it is
> > possible to force interpretation of the arg as a patch
> > 
> >   $ ./scripts/checkpatch.pl --patch master..
> > 
> > will force it to load a patch file called "master..", or equivalently
> > 
> >   $ ./scripts/checkpatch.pl --no-branch master..
> > 
> > will simply turn off guessing of GIT revision lists.
> > 
> > Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
> > Message-Id: <20170913091000.9005-1-berrange@redhat.com>
> > Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> > ---
> >  scripts/checkpatch.pl | 138 ++++++++++++++++++++++++++++++++++++++++----------
> >  1 file changed, 111 insertions(+), 27 deletions(-)
> 
> 
> This introduces the following regression for me:
> 
> $ ./scripts/checkpatch.pl patches-next/vfio-pci-add-virtual
> ERROR: trailing whitespace
> #44: FILE: vfio-pci-add-virtual:44:

IIUC, it is treating 'patches-next/vfio-pci-add-virtual' as a plain
source file, rather than a patch file because its filename doesn't
include .patch at the end.

I the heuristic based on the idea that there's always be a .patch
at the end of patch files. git format-patch at least will do this
by default - is there a particular reason you've not got any file
extension ?

BTW, assuming this diagnosis is correct, if you use --patch
it should work. eg try

./scripts/checkpatch.pl --patch patches-next/vfio-pci-add-virtual

Regards,
Daniel
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