Re: [PATCH] pwm: Replace license and copyright boilerplate by SPDX identfiers

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Hallo Ahmad,

On Wed, May 20, 2020 at 04:59:21PM +0200, Ahmad Fatoum wrote:
> On 5/20/20 3:59 PM, Uwe Kleine-König wrote:
> > Hello,
> > 
> > On Wed, May 20, 2020 at 02:10:47PM +0200, Ahmad Fatoum wrote:
> >> On 5/19/20 6:52 PM, Uwe Kleine-König wrote:
> >>> This adapts all files that were identifed by licensecheck
> >>> (https://salsa.debian.org/build-common-team/licensecheck.git) as
> >>> licensed under the GPL and that have a (IMHO) clear copyright statement.
> >>>
> >>> The advantage is that these specifiers are machine-parseable which helps
> >>> license conformance, e.g. for packaging barebox in Debian.
> >>>
> >>> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
> >>> ---
> >>>  drivers/pwm/core.c    | 15 +++------------
> >>>  drivers/pwm/pwm-mxs.c | 12 ++----------
> >>>  drivers/pwm/pxa_pwm.c |  6 ++----
> >>>  3 files changed, 7 insertions(+), 26 deletions(-)
> >>>
> >>> diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
> >>> index 05dad93e5ce3..878f4d72bbf5 100644
> >>> --- a/drivers/pwm/core.c
> >>> +++ b/drivers/pwm/core.c
> >>> @@ -1,17 +1,8 @@
> >>> +// SPDX-License-Identifier: GPL-2.0-or-later
> >>> +// SPDX-FileCopyrightText: 2011 Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
> >>> +
> >>>  /*
> >>>   * Generic pwmlib implementation
> >>> - *
> >>> - * Copyright (C) 2011 Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
> >>> - *
> >>> - *  This program is free software; you can redistribute it and/or modify
> >>> - *  it under the terms of the GNU General Public License as published by
> >>> - *  the Free Software Foundation; either version 2, or (at your option)
> >>> - *  any later version.
> >>> - *
> >>> - *  This program is distributed in the hope that it will be useful,
> >>> - *  but WITHOUT ANY WARRANTY; without even the implied warranty of
> >>> - *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> >>> - *  GNU General Public License for more details.
> >>>   */
> >>>  #include <common.h>
> >>>  #include <errno.h>
> >>> diff --git a/drivers/pwm/pwm-mxs.c b/drivers/pwm/pwm-mxs.c
> >>> index a06040ac3268..1e2db39def22 100644
> >>> --- a/drivers/pwm/pwm-mxs.c
> >>> +++ b/drivers/pwm/pwm-mxs.c
> >>> @@ -1,13 +1,5 @@
> >>> -/*
> >>> - * Copyright 2012 Freescale Semiconductor, Inc.
> >>> - *
> >>> - * The code contained herein is licensed under the GNU General Public
> >>> - * License. You may obtain a copy of the GNU General Public License
> >>> - * Version 2 or later at the following locations:
> >>> - *
> >>> - * http://www.opensource.org/licenses/gpl-license.html
> >>> - * http://www.gnu.org/copyleft/gpl.html
> >>> - */
> >>> +// SPDX-License-Identifier: GPL-2.0-only
> >>
> >> The deleted text says "or later"
> > 
> > Strange as I didn't do this manually. My scratch-pad has:
> > 
> > 	add_license() {
> > 		git grep -L SPDX-License-Identifier | grep -E '\.(c|cpp|h)$' | xargs licensecheck | awk -F: '$2 == " '"$1"'" {print $1}' | xargs sed -i "1i // SPDX-License-Identifier: $2"
> > 	}
> > 
> > 	add_license "GPL (v2)" "GPL-2.0-only"
> > 	add_license "GPL (v2 or later)" "GPL-2.0-or-later"
> > 
> > which does the right thing when I rety it.
> 
> You could verify your changes by checking whether /later/ appears
> in pairs for each hunk:
> 
> perl -0777 -F'/^@/gm' -ne 'for (@F) { @m = /later/g; print if @m & 1 }' spdx.patch

I had to read quite some perl docs to understand that. *impressed*

> > I just rechecked the other patches I created and this is the only
> > problematic change.

Applied on all my patches this only finds the above issue if I use
--inter-hunk-context=3 (e.g.:

	git show --format=fuller --inter-hunk-context=3 1a546e28341b | perl -0777 -F'/^@/gm' -ne 'for (@F) { @m = /later/g; print if @m & 1 }

). Without --inter-hunk-context=2 some files have more than one hunk and
so trigger your test.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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