Let's make this behave more like all the rest of the meson stuff.
This also is the first step to making it a bit more flexible so we
can define integration tests in different ways as will be seen in
the next commits.
This commit adds definitions to build the minimal_0 and minimal_1
images with mkosi and includes them into the system image. We also
move the building of the various app-xxx and similar images that are
extremely minimal into the tests itself by moving the related logic
from install_verity_minimal() into a new function
install_extension_images() in util.sh. Because the mkosi /usr is
read-only, we now place the extension images in /tmp instead of
/usr/share.
Co-authored-by: Richard Maw <richard.maw@codethink.co.uk>
Co-authored-by: sam-leonard-ct <sam.leonard@codethink.co.uk>
Unprivileged overlayfs is supported since Linux 5.11. The only
change needed to get ExtensionDirectories to work is to avoid
hard-coding the staging directory to the system manager runtime
directory, everything else just works (TM).
The only piece missing was to somehow make /proc appear in the
new user+mount namespace. It is not possible to mount a new
/proc instance, not even with hidepid=invisible,subset=pid, in
a user namespace unless a PID namespace is created too (and also
at the same time as the other namespaces, it is not possible to
mount a new /proc in a child process that creates a PID namespace
forked from a parent that created a user+mount namespace, it has
to happen at the same time).
Use the host's /proc with a bind-mount as a fallback for this
case. User session services would already run with it, so
nothing is lost.
Specifying the test number manually is tedious and prone to errors (as
recently proven). Since we have all the necessary data to work out the
test number, let's do it automagically.
As in 2a5fcfae02
and in 3e67e5c992
using /usr/bin/env allows bash to be looked up in PATH
rather than being hard-coded.
As with the previous changes the same arguments apply
- distributions have scripts to rewrite shebangs on installation and
they know what locations to rely on.
- For tests/compilation we should rather rely on the user to have setup
there PATH correctly.
In particular this makes testing from git easier on NixOS where do not provide
/bin/bash to improve compose-ability.
We wait for "basic.target" being reached in the user instance anyway
before allowing the user's session to start, hence doing such a wait is
unnecessary, since that would just mean we'd wait for "default.target"
on top of "basic.target", but we shouldn#t need anything of that...
Hence, let's simplify this, reduce explicit sync points.
The name is not as universal as we want, still, hence let's use our own
user we create with sysusers.d/. That should yield same behaviour
everywhere (and also test sysusers a bit as side effect).
let's make sure we always invoke our commands through /bin/sh, since
on some distros su will use /bin/nologin (or whatever is listed in
/etc/passwd) as shell otherwise and we don#t want that.
To support ProtectHome=y in a user namespace (which mounts the inaccessible
nodes), the nodes need to be accessible by the user. Create these paths and
devices in the user runtime directory so they can be used later if needed.
The test exercises that PrivateTmp=yes and ProtectHome={read-only,tmpfs}
directives work as expected when PrivateUsers=yes in a user manager.
Some code is also added to test-functions to help set up test cases that
exercise the user manager.
