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semaphore CI runs are always very close to the limit of 1hr, and often
time out when it's particularly oversubscribed.
Skip some low-value test cases to shorten the runtime.
This function was listed in the public sd-varlink.h header, but not
actually made public. Fix that. It's quite useful, the comment in it
describes the usecase nicely.
Fixes: #35554
This way, users don't have to check those features using an external
program, or wait for later failure when trying to enroll using an
unsupported feature.
E.g.:
```
# systemd-cryptenroll --fido2-device list
PATH MANUFACTURER PRODUCT RK CLIENTPIN UP UV
/dev/hidraw2 Yubico YubiKey OTP+FIDO+CCID yes no yes no
```
This introduces a new unit condition check: that matches if a specific
kmod module is allowed. This should be generally useful, but there's one
usecase in particular: we can optimize modprobe@.service with this and
avoid forking out a bunch of modprobe requests during boot for the same
kmods.
Checking if a kernel module is loaded is more complicated than just
checking if /sys/module/$MODULE/ exists, since kernel modules typically
take a while to initialize and we must check that this is complete (by
checking if the sysfs attr "initstate" is "live").
If - for whatever reason - a script uses set -u (nounset) and includes
/etc/profile.d/70-systemd-shell-extra.sh (e.g. transitively via
/etc/profile) the script would fail with:
/etc/profile.d/70-systemd-shell-extra.sh: line 15: SHELL_PROMPT_PREFIX: unbound variable
For example:
$ cat > foo.sh <<EOF
#!/bin/sh
set -u
source /etc/profile
EOF
$ chmod 700 foo.sh
$ ./foo.sh
/etc/profile.d/70-systemd-shell-extra.sh: line 15: SHELL_PROMPT_PREFIX: unbound variable
Fix this by using shell parameter substitution[^1] (which is a POSIX
shell concept) to set the $SHELL_* variables to the empty string if
undefined.
[^1]: https://pubs.opengroup.org/onlinepubs/9699919799.2018edition/utilities/V3_chap02.html
Now that we have an explicit userns check we can drop the heuristic for
it, given that it's kinda wrong (because mapping the full host UID range
into a userns is actually a thing people do).
Hence, just delete the code and only keep the userns inode check in
place.
Now that we have a reliable pidns check I don't think we really should
look for cgroupns anymore, it's too weak a check. I mean, if I myself
would implement a desktop app sandbox (like flatpak) I'd always enable
cgroupns, simply to hide the host cgroup hierarchy.
Hence drop the check.
I suggested adding this 4 years ago here:
https://github.com/systemd/systemd/pull/17902#issuecomment-745548306
Document the fact that read-only properties may not have the flag
SD_BUS_VTABLE_UNPRIVILEGED as that is not obvious especially given the
flag is accepted for writable properties.
Based on the check in `add_object_vtable_internal` called by
`sd_bus_add_object_vtable` (as of the current tip of the main branch
f7f5ba0192):
case _SD_BUS_VTABLE_PROPERTY: {
[...]
if ([...] ||
[...]
(v->flags & SD_BUS_VTABLE_UNPRIVILEGED && v->type == _SD_BUS_VTABLE_PROPERTY)) {
r = -EINVAL;
goto fail;
}
(where `_SD_BUS_VTABLE_PROPERTY` means read-only property whereas
`_SD_BUS_VTABLE_WRITABLE_PROPERTY` maps to writable property).
This was implemented in the commit
adacb9575a ("bus: introduce "trusted" bus
concept and encode access control in object vtables") where
`SD_BUS_VTABLE_UNPRIVILEGED` was introduced:
Writable properties are also subject to SD_BUS_VTABLE_UNPRIVILEGED
and SD_BUS_VTABLE_CAPABILITY() for controlling write access to them.
Note however that read access is unrestricted, as PropertiesChanged
messages might send out the values anyway as an unrestricted
broadcast.
This way, users don't have to check those features using an external program, or
wait for later failure when trying to enroll using an unsupported feature.
