In the mmdebstrap autpkgtest, debian/tests/sourcesfilter will write out
/etc/apt/sources.list before the test's setup-hook is run. Thus, the
test's setup-hook will overwrite the contents of the sources.list that
debian/tests/sourcesfilter set up, which will end up pulling in the
wrong packages.
Thus, only write out our own /etc/apt/sources.list if it does not yet
exist. If it does exist, nothing needs to be done.
Since systemd 256~rc3-3, /tmp is regularly cleaned up, removing files
older than 10 days. Since a rootfs contains files with timestamps
potentially much older than that, we exclude our temporary directory by
adding an exclusive lock on it which will stop systemd-tmpfiles from
cleaning up anything in it.
Thanks: Peter Pentchev <roam@ringlet.net>
Since systemd 256~rc3-3, /tmp is mounted as tmpfs by default. This
breaks our tests because /tmp is mounted with nodev which makes it
impossible for debootstrap to mknod.
This emulates what unshare(1) does by default or by passing
--propagation=private explicitly. Mounting and unmounting filesystems
will affect mounts outside the namespace which are marked as shared (see
last column of `findmnt -o+PROPAGATION`). Since mmdebstrap's goal is to
isolate the mounts in the new namespace, we perform the equivalent of
mount(NULL, "/", MS_REC | MS_PRIVATE, NULL);
from util-linux/sys-utils/unshare.c:set_propagation() which is in shell:
mount --make-rprivate /
See mount_namespaces(7) for details. Without setting this, unmounting
/sys (and its sub-mounts) in unshare mode as root user will also unmount
the sub-mounts of /sys on the outside of the namespace. This breaks
tests/unshare-as-root-user which will fail to shut down with the following
errors in the log:
[FAILED] Failed unmounting mnt.mount - /mnt.
[FAILED] Failed unmounting run-lock.mount - Legacy Locks Directory /run/lock.
[...]
[ OK ] Reached target poweroff.target - System Power Off.
Afterwards it will stall indefinitely. Stopping mmdebstrap from messing
with the /sys mounts on the outside stops this behaviour and allows to
cleanly shut down the virtual machine.
Thanks: Helmut Grohne
Otherwise it fails with:
umount: /tmp/mmdebstrap.Tw9G7ZLL4J/mnt: filesystem was unmounted, but failed to update userspace mount table.
E: setup failed: E: command failed: umount --lazy "$1/mnt"
Also umount mnt/dev.
Jochen Sprickerhof
Max-Julian Pogner
Francesco Poli