linux-kernel - Re: [PATCH] perf tools: Use $KBUILD_BUILD

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Date:   Sat, 13 May 2023 20:51:16 +0200
From:   Ben Hutchings <ben@...adent.org.uk>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Salvatore Bonaccorso <carnil@...ian.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf tools: Use $KBUILD_BUILD_TIMESTAMP as man page date

On Wed, 2023-05-10 at 09:59 -0300, Arnaldo Carvalho de Melo wrote:
> Em Tue, May 09, 2023 at 09:03:28PM +0200, Salvatore Bonaccorso escreveu:
> > Hi Peter, Ingo, Arnaldo,
> > 
> > On Tue, May 17, 2016 at 02:28:09PM +0100, Ben Hutchings wrote:
> > > This allows man pages to be built reproducibly.
> > > 
> > > Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
> > > ---
> > > --- a/tools/perf/Documentation/Makefile
> > > +++ b/tools/perf/Documentation/Makefile
> > > @@ -120,6 +120,9 @@ endif
> > >  ifdef DOCBOOK_SUPPRESS_SP
> > >  XMLTO_EXTRA += -m manpage-suppress-sp.xsl
> > >  endif
> > > +ifdef KBUILD_BUILD_TIMESTAMP
> > > +ASCIIDOC_EXTRA += -a revdate=$(shell date -u -d '$(KBUILD_BUILD_TIMESTAMP)' +%Y-%m-%d)
> > > +endif
> > >  
> > >  SHELL_PATH ?= $(SHELL)
> > >  # Shell quote;
> > > --- a/tools/perf/Documentation/asciidoc.conf
> > > +++ b/tools/perf/Documentation/asciidoc.conf
> > > @@ -71,6 +71,9 @@ ifdef::backend-docbook[]
> > >  [header]
> > >  template::[header-declarations]
> > >  <refentry>
> > > +<refentryinfo>
> > > +template::[docinfo]
> > > +</refentryinfo>
> > >  <refmeta>
> > >  <refentrytitle>{mantitle}</refentrytitle>
> > >  <manvolnum>{manvolnum}</manvolnum>
> > 
> > As we do apply the change in Downstream in Debian, I was wondering if
> > it just felt trough the cracks and could still be applied. Is there
> > anything missing?
> 
> Isn't this fixed in:
> 
> commit d586ac10ce56b2381b8e1d8ed74660c1b2b8ab0d
> Author: Ian Rogers <irogers@...gle.com>
> Date:   Fri Sep 20 21:13:27 2019 -0700
> 
>     perf docs: Allow man page date to be specified
> 
>     With this change if a perf_date parameter is provided to asciidoc then
>     it will override the default date written to the man page metadata.
[...]

Not entirely, because the value for perf_date is currently generated
with "git log", and Debian package builds are not done from a Git
checkout.  I'll revise my patch to allow perf_date to be set from
KBUILD_BUILD_TIMESTAMP, which is already used in the kernel build.

Ben.

-- 
Ben Hutchings
Life would be so much easier if we could look at the source code.

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