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When using --current switch, copy in current hash, don't just reassign
buffers forgetting about the old.
While we are at it, allocate the local copy buffer later, in
measure_pcr() as we won#t need it in the --current case.
Otherwise we might start writing to one of its partition before the
respective node is created under /dev, resulting in... interesting
stuff.
Resolves: #24390
Explicitly enable all features/components in the mkosi build to
ensure they all get built and we get an error if they can't be built.
We also rework the packages sections of all mkosi configs to reduce
duplication and cover all the dependencies necessary to build/use all
systemd features.
Note that for the final image, since systemd is installed by default
in base images, we rely on that to install the base library dependencies
and we only list extra optional dependencies and tools that aren't already
installed by default into the base image.
We also drop the centos stream 8 mkosi build as dependencies on that
distro are too out-of-date to be able to build all systemd features.
Since centos stream 9 has been out for a while, let's focus on that
and leave it to downstream to keep systemd building on centos stream 8.
Finally, there's a few additions to the mkosi scripts to make sure
services don't start by default on boot.
The knot.service on Ubuntu Jammy loads an env file which we didn't
install, causing the service to fail:
```
knot.service: Will spawn child (service_enter_start_pre): /usr/sbin/knotc
knot.service: Failed to load environment files: No such file or directory
knot.service: Failed to run 'start-pre' task: No such file or directory
knot.service: Failed with result 'resources'.
knot.service: Service will not restart (restart setting)
```
This allows allows shortcutting measurements of the specified files and
use the information from /sys/ instead.
This is not too useful on its own given that "systemd-measure status"
already exists which displays the current, relevant PCR values. The main
difference is how "complete" the information is. "status" will detect if
the measurements make any sense, and show more than PCR 11. "calculate
--current" otoh only reads PCR 11 and uses that, and that's really it.
This is mainly preparation for later work to add PCR signing to the
tool, where usually it makes most sense to sign prepared kernel images,
but for testing it's really useful to shortcut signing to the current
PCR values instead
prefix_roota() is something we should stop using. It is bad for three
reasons:
1. As it names suggests it's supposed to be used when working relative
to some root directory, but given it doesn't follow symlinks (and
instead just stupidly joins paths) it is not a good choice for that.
2. More often than not it is currently used with inputs under control of
the user, and that is icky given it typically allocates memory on the
stack.
3. It's a redundant interface, where chase_symlinks() and path_join()
already exist as better, safer interfaces.
Hence, let's start moving things from prefix_roota() to path_join() for
the cases where that's appropriate.
Previously, the test would rely on the fact that systemd-hwdb would
follow symlinks outside of the --root= hierarchy. That's a bug however,
and systemd-hwdb shouldn't do that. Hence let's remove the fact that the
test relies on it, so that we can then fix systemd-hwdb (specifically:
conf_files_list()) accordingly.
This adds support for Fn+PrtSc on my Lenovo Thinkpad Extreme gen 2. Judging by the picture on the key, it should probably instead of prog2 be "selective_screenshot" (that is a possible value from judging this list e18d950ce5/keynames.txt ) but that does not register with evtest at all. With this change, evtest reports:
```
Event: time 1661081631.027773, type 1 (EV_KEY), code 149 (KEY_PROG2), value 1
Event: time 1661081631.027773, -------------- SYN_REPORT ------------
Event: time 1661081631.027886, type 1 (EV_KEY), code 149 (KEY_PROG2), value 0
Event: time 1661081631.027886, -------------- SYN_REPORT ------------
```
I am not sure if systemd is the right place to add this, if not, please refer me somewhere else.
Otherwise it complains about a set but unused variable:
```
../src/basic/hashmap.c:1070:48: error: variable 'n_rehashed' set but not used [-Werror,-Wunused-but-set-variable]
unsigned old_n_buckets, new_n_buckets, n_rehashed, new_n_entries;
^
1 error generated.
```
