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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.
