[PATCH inputproto] specs: Set TZ=UTC before calling asciidoc

[Andreas Boll]

2016-03-30 6:26 GMT+02:00 Peter Hutterer <peter.hutterer at who-t.net>:
> On Fri, Dec 11, 2015 at 10:49:33AM +0100, Andreas Boll wrote:
>> Set TZ=UTC before calling asciidoc to make the embedded dates invariant
>> to timezones in order to make the package build reproducibly.
>
> quick check shows that the date embedded includes a timestamp with seconds
> granularity. So unless your build system forces the exact same time for
> every build, the result is still not reproducible. And if the build system
> forces the time, why can't it force the timezone too?
>
> what am I missing here?
>
> Cheers,
>    Peter

>From [1] "The date is based in the last modified date of the source
file, but is sensible to the timezone."

In this case the source files are specs/XI2proto.txt and specs/XIproto.txt.
So the timestamps in the generated html files depend only on the build
system's timezone which could be overridden via TZ=UTC.

An alternate solution which could remove the timestamp from the
generated html file has been proposed to asciidoc but unfortunately
upstream hasn't merged that patch so far [2].

Thanks,
Andreas

[1] https://wiki.debian.org/ReproducibleBuilds/TimestampsInDocumentationGeneratedByAsciidoc
[2] https://github.com/asciidoc/asciidoc/pull/9


>>
>> Fixes bug:
>> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=795981
>>
>> v2: Set TZ=UTC after $(AM_V_GEN) (fixes non-verbose build)
>>
>> Suggested-by: Eduard Sanou <dhole at openmailbox.org>
>> Signed-off-by: Andreas Boll <andreas.boll.dev at gmail.com>
>> ---
>>  specs/Makefile.am | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/specs/Makefile.am b/specs/Makefile.am
>> index a83cf40..f2454bc 100644
>> --- a/specs/Makefile.am
>> +++ b/specs/Makefile.am
>> @@ -6,7 +6,7 @@ doc_DATA = XI2proto.html XIproto.html
>>  dist_doc_DATA = XI2proto.txt XIproto.txt
>>
>>  %.html: %.txt
>> -     $(AM_V_GEN)$(ASCIIDOC) -o $@ $<
>> +     $(AM_V_GEN)TZ=UTC $(ASCIIDOC) -o $@ $<
>>
>>  CLEANFILES = $(doc_DATA)
>>
>> --
>> 2.1.4
>