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/tmp might not be mounted at all yet (given that we support
SYSTEMD_NSPAWN_TMPFS_TMP=0 to turn this off), and /tmp is a dir systemd
usually tries to unmount during shutdown (unlike /run), and we shouldn't
keep it busy. Hence let's just move these deleted files to /run so that
we don't keep /tmp needlessly busy.
The journal files might not be tiny hence let's write them to /var/tmp/
instead of /tmp. Also, let's turn on NOCOW on the files, as these tests
might apparently be slow on btrfs.
Fixes: #12210
We can't use the per-thread default one here, as it might already be
running (for example, that's the case in portabled), and our event loops
are not recursive, hence running them a second time is not OK.
There are environments where /lib might not be necessary (think:
statically compiled portable service binary), hence don't insist on it
if the image is read-only.
If we know that a syscall is undefined on the given architecture, don't
even try to add it.
Try to install the filter even if some syscalls fail. Also use a helper
function to make the whole a bit less magic.
This allows the S[UG]ID test to pass on arm64.
Building on previous commit, let's pass the unit name when parsing
dbus message or builtin whitelist, which is better than nothing.
seccomp_parse_syscall_filter() is not needed anymore, so it is removed,
and seccomp_parse_syscall_filter_full() is renamed to take its place.
We would log "(null):0: Failed to parse system call, ignoring: rseq" from
log_syntax_internal() from log_syntax() from seccomp_parse_syscall_filter_full()
from seccomp_parse_syscall_filter() from config_parse_syscall_filter(),
when generating the built-in @default whitelist. Since it was not based on the
unit file, we would not pass a file name.
So let's make sure that log_syntax() does not print "(null)" pointer (which is
iffy and ugly), and use the unit name as fallback or nothing if both are missing.
In principle, one of the two should be always available, since why use log_syntax()
otherwise, but let's make things more resilient by guarding against this case too.
log_syntax() is called from a thousand places, and often in error path, so it's
hard to verify all callers.
