From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
Subject: bug#27563: [PATCH v3 0/2] Make ghostscript reproducible.
Date: Fri, 07 Jul 2017 17:18:15 +0200
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	<20170706103216.25939-1-dannym@scratchpost.org>
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To: Danny Milosavljevic <dannym@scratchpost.org>
Cc: 27563@debbugs.gnu.org

Danny Milosavljevic <dannym@scratchpost.org> skribis:

> Hi Ludo,
>
> On Fri, 07 Jul 2017 14:00:09 +0200
> ludo@gnu.org (Ludovic Court=C3=A8s) wrote:
>
>> Danny Milosavljevic <dannym@scratchpost.org> skribis:
>>=20
>> > Also, newer PDF files have an RDF header specifying some extra informa=
tion
>> > in an XML-like format.  For example there's an instance UUID (PDF/A sp=
ecifies
>> > that it's recommended to set this to an empty string), and a document =
UUID.
>> > The latter again is time-based.=20=20
>>=20
>> If it=E2=80=99s time-based, then the solution may be to honor SOURCE_DAT=
E_EPOCH.
>
> Upstream says definitely not.  The UUIDs are supposed to be unique and th=
ey don't want anyone writing fixed UUIDs into documents (except for "" for =
the instance ID which they themselves do).
>
> I think there could be some enterprise search engine which associates a d=
ocument with other resources using the document UUID - and if everyone went=
 and reused UUIDs it would be very confused.
>
> That's why I left it off.

OK, makes sense.  Maybe we can still have it disabled (or enabled) by
environment variable instead of having it removed wholesale?

Ludo=E2=80=99.