[Reproducible-builds] Reproducible patches for libisoburn and libisofs

[Chris Lamb]

> > *iff* SOURCE_DATE_EPOCH is set:
> > 
> >  - mtimes are taken from stat(2). [The FS creator is responsible for
> >   ensuring they are reproducible, possibly by some "clamping" call
> >   to `find -newermt | xargs touch …`.]
> >
> > - atime is copied from mtime [as FS creator "can't" set that].
> >
> > - ctime is copied from mtime [ditto].
> 
> man 2 utime promises to set atime and xorriso tries to restore it when
> extracting files to disk.

I put "can't" in quotes as there is no pervasive/widespread shell-level
tool for this (cf. touch(1)) so I stand by this.

> But for ctime i know no portable method.

Mm.

> Export SOURCE_DATE_EPOCH and forget about any other time issues which
> you don't create yourself by own xorriso arguments.

I'm sorry but I don't quite follow and I don't want to read what I want
to read. Please could you clarify exactly the behaviour in this case?

> Looks like  --set_all_file_dates  is losing its only user even before it
> gets released.

(Which is good; the less options the better IMHO.)

> > I am therefore not testing them from
> > the "Debian" point of view and ACKs are simply my own testcases.
> 
> Any ACK or NAK is highly welcome.

I'm sure; I was just trying to avoid the case of — heaven forbid we broke
the Debian CD creation! — that we would get the blame as ACKing on their
behalf. :)


Regards,

-- 
      ,''`.
     : :'  :     Chris Lamb
     `. `'`      lamby at debian.org / chris-lamb.co.uk
       `-