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The ":=" operator was only added in Python 3.8 so splitting the line with it into two makes check-os-release.py actually fulfill its claim of working with any python version.
When a service is triggered by a path unit, pass the
path unit name and the path that triggered it via env vars
to the spawned processes.
Note that this is best-effort, as there might be many triggers
at the same time, but we only get woken up by one.
Not wired in by any unit type yet, just the basic to allocate,
ref, deref and plug in to other unit types.
Includes recording the trigger unit name and passing it to the
triggered unit as TRIGGER_UNIT= env var.
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
History of the function:
96788d2aa4 assume system is running on AC power when no battery found
795e86b4f1 ignore USB-C ports in power source mode when detecting system is running on AC power
c19a51bec4 invert ac_power() source type check
6d89003462 assume ac when /sys/class/power_supply is missing
240dbaa44f add ConditionACPower=
Interestingly, the return condition 'on_ac_power == found_online || !found_offline'
was there from the very beginning, and even Yu's latest change doesn't change this,
but only extends it to 'on_ac_power == found_online || !found_offline || !found_battery'.
This means that any system with no AC power supply will be unconditionally classified
as on_ac_power.
Let's change the logic: if we have an online AC supply, answer is "yes". If no
supplies, but we have a battery, answer is "no". Otherwise, assume "yes", based
on the assumption that presense of a battery would at least be always reported,
even if an AC power supply might not be.
Fixes#24407. It also shouldn't impact previous fixes: assume ac when
/sys/class/power_supply is missing, ignore USB-C ports in power source mode,
assume system is running on AC power when no battery found.
There are dozens of places where this could be used, but I don't
want to do the conversion now because it's quite a bit of work.
I think we could export this function later on, because reading
numerical attributes is so common. But for now, I'm just adding the
helper to use it one place.
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)
```
The warning isn't that serious and mostly there to inform the user that
lld/mold cannot build efi binaries. It is also better to build test with
fatal meson warnings.
The general idea is that users should be able to figure out if some option
that they see in a config file or on some internet page is something that
systemd knows about. Once users know that, yes, this was an option but has
been deprecated and removed from the documentation, it's much easier for them
to find any docs in old versions if they want to. Or to switch to something
different.
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.
