Hello!   :-)

I noticed that there's something missing in images created with
'mmdebstrap-autopkgtest-build-qemu'.


After:

  $ mkdir -p ~/.cache/sbuild/build
  $ cd /dev/shm
  $ TMPDIR=/dev/shm mmdebstrap-autopkgtest-build-qemu \
                    --size=25G --boot=efi sid unstable-autopkgtest-amd64.img
  $ mv -i unstable-autopkgtest-amd64.img ~/.cache/sbuild/

I can run 'sbuild-qemu-boot':

  $ sbuild-qemu-boot --boot=efi --shared-dir $(pwd) unstable-autopkgtest-amd64.img

however, the '--shared-dir' option fails to work.

Actually the man page sbuild-qemu-boot(1) says that this will only
work when the image was created with sbuild-qemu-create(1).

But I would like this option to also work when the image was created
with mmdebstrap-autopkgtest-build-qemu(1).
So this is my feature request: please modify
'mmdebstrap-autopkgtest-build-qemu' so that the '--shared-dir' option
of sbuild-qemu-boot(1) can work.

I hope this is not too difficult.
Please let me know.

Thanks for your time and patience!

The solution to this is actually quite simple. All that is needed are
these two lines [1], which in the guest create an fstab entry for a 9p
filesystem with the ID 'sbuild-qemu'.

This ID is poorly chosen, I'll name it to something more generic like
'host-shared' or whatever in the next release so that other tools can
make use of the same feature if they want (regardless of
sbuild-qemu-boot or not).

Best,
Christian

[1]: https://sources.debian.org/src/sbuild/0.89.2/bin/sbuild-qemu-create-modscript/#L81-L82