Before this, tests are split into two categories, system and user, but
both are running in fully privileged environment. Hence, unprivileged
user scope was mostly not covered by the test.
Let's run all tests in both system and user scopes, and drop capabilities
when Manager is running in user scope.
This also makes the host environment protected more from the test run.
test-execute checks that only /var/lib/private/waldo is writable, but there are
some filesystems that are always writable and excluded. Add /sys/devices/system/cpu
which is created by lxcfs.
Fixes https://github.com/systemd/systemd/issues/23263
Those are all consumed by our parser, so they all support comments.
I was considering whether they should have a license header at all,
but in the end I decided to add it because those files are often created
by copying parts of real unit files. And if the real ones have a license,
then those might as well. It's easier to add it than to make an exception.
All backslashes that should be single in shell syntax need to be written as "\\" because
our parser will remove one level of quoting. Also, single quotes were doubly nested, which
cannot work.
Should fix the following message:
test-execute/exec-dynamicuser-statedir.service:16: Ignoring unknown escape sequences: "test $$(find / \( -path /var/tmp -o -path /tmp -o -path /proc -o -path /dev/mqueue -o -path /dev/shm -o -path /sys/fs/bpf -o -path /dev/.lxc \) -prune -o -type d -writable -print 2>/dev/null | sort -u | tr -d \\n) = /var/lib/private/quux/pief/var/lib/private/waldo"
We go through the whole file system, so this test can take arbitrary time. But
this test is still quite useful, so let's at least try to make it more efficent
by not descending at all into the directories we would filter out later on
anyway.
Also increase the timeout, in case the previous step doesn't help enough.
