From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Subject: bug#35283: ISO images are not reproducible
Date: Sun, 21 Apr 2019 00:57:19 +0200
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To: Thomas Schmitt <scdbackup@gmx.net>
Cc: bug-xorriso@gnu.org, 35283-done@debbugs.gnu.org

Hi Thomas,

"Thomas Schmitt" <scdbackup@gmx.net> skribis:

> If you want a fixed time for all three timestamps in all files, do:
>
>   -volume_date all_file_dates =3D"$SOURCE_DATE_EPOCH"

Thanks, that=E2=80=99s what I was missing.

It was still not the end of the story, but I have some good news: the
series of commits below allow me to build ISO images reproducibly!  \o/

  1b0b1651b1 gnu: mtools: 'mformat' initializes boot sector before writing =
it.
  5502fbd7fd gnu: valgrind: Add 3.15.0.
  605815023c vm: Use a fixed FAT serial number for 'efi.img' in ISO images.
  52b5fe5bcf gnu: grub: 'grub-mkrescue' honors 'GRUB_FAT_SERIAL_NUMBER'.
  6901b9248e vm: Reset file timestamps of the EFI image in ISO images.
  833480cc1f vm: Reset file timestamps in ISO images.

To check by yourself you can do, say:

  guix system disk-image --file-system-type=3Diso9660 \
     gnu/system/examples/bare-bones.tmpl

and then check the ISO derivation that was built as the last step above:

  guix build --check -K /gnu/store/=E2=80=A6-image.iso.drv

Ludo=E2=80=99.