bug#27563: [PATCH v3 0/2] Make ghostscript reproducible.

[Ludovic Courtès]

Danny Milosavljevic <address@hidden> skribis:

> Hi Ludo,
>
> On Fri, 07 Jul 2017 14:00:09 +0200
> address@hidden (Ludovic Courtès) wrote:
>
>> Danny Milosavljevic <address@hidden> skribis:
>> 
>> > Also, newer PDF files have an RDF header specifying some extra information
>> > in an XML-like format.  For example there's an instance UUID (PDF/A 
>> > specifies
>> > that it's recommended to set this to an empty string), and a document UUID.
>> > The latter again is time-based.  
>> 
>> If it’s time-based, then the solution may be to honor SOURCE_DATE_EPOCH.
>
> Upstream says definitely not.  The UUIDs are supposed to be unique and they 
> 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 
> document 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’.