Bug#842299: autopkgtest-virt-qemu: attaching base image makes btrfs very confused

[Martin Pitt]

Christian Seiler [2016-10-30 21:12 +0100]:
> Well, it's not actually SYSTEMD_READY, the "btrfs ready" builtin is
> actually the culprit.

> So one needs to make sure the btrfs ready builtin is never executed
> for the corresponding devices. Which is why I did the LABEL/goto
> logic in my example.

So to generalize that a bit: blkid is called in
60-persistent-storage.rules, so we could add a rule to the already
existing /run/udev/rules.d/61-baseimage.rules:

     KERNEL=="vd*", ENV{ID_SERIAL}=="BASEIMAGE", ENV{ID_FS_TYPE}="", ENV{ID_FS_USAGE}="", ENV{ID_FS_UUID}=""

This should short-circuit 64-btrfs.rules and any similar rules. This
at least works in a VM with ext4.

Martin

-- 
Martin Pitt                        | http://www.piware.de
Ubuntu Developer (www.ubuntu.com)  | Debian Developer  (www.debian.org)