Bug#949843: sbuild: add systemd-nspawn chroot mode

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Bug#949843: sbuild: add systemd-nspawn chroot mode

Daniel Schepler-6
Package: sbuild
Version: 0.78.1-2
Severity: wishlist

Here's my initial version of the cleaned up patch for adding a
--chroot-mode=systemd-nspawn.  Some things I'm not sure about:
- Should we maybe ping upstream and/or Debian maintainers on
https://github.com/systemd/systemd/issues/13297 to see how hard it
would be to get it fixed so I could remove that whole ugly workaround?
 (The workaround also only handles bind mount settings at present -
and for example, I've found that a lot of package builds will require
SystemCallFilter=@memlock due to a lot of crypto libraries and
utilities giving errors if they're denied access to mlock.  So I would
probably want to add that to my
/etc/systemd/nspawn/unstable-amd64-sbuild.nspawn config file.)
- It currently requires giving sudo access for systemd-run, which
essentially would open up execution of anything desired.  And the fact
that it requires NOPASSWD (because some of the commands redirect
stdin/stdout) makes things even worse.  And even if you restrict it to
e.g. "systemd-run -M unstable-amd64-sbuild*" it still seems it would
be possible to fool that with something like "sudo systemd-run -M
unstable-amd64-sbuild -M .host ~/myevilcmd".
- If you want to ignore the small patch in lib/Sbuild/Chroot.pm that's
fine.  It's not really related to the systemd-nspawn chroot mode.
- It does add a dependency on libipc-run-perl.
- It would be nice (as a future enhancement) if it would be possible
to configure this backend to start the container in --network-veth
mode and set up the host's side of the veth to forward only traffic
to/from apt-cacher-ng on localhost:3142.  Not sure how hard that would
be to accomplish.

--
Daniel Schepler

systemd-nspawn-chroot-mode.patch (20K) Download Attachment
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Bug#949843: Missed part of systemd-nspawn patch

Daniel Schepler-6
I just realized based on some testing that I forgot to send part of
the patch, which is needed for sbuild-update to work with the
systemd-nspawn chroot backend.
--
Daniel Schepler

systemd-nspawn-chroot-mode-utils.patch (894 bytes) Download Attachment