Currently inhibitors are bypassed unless an explicit request is made to
check for them, or even in that case when the requestor is root or the
same uid as the holder of the lock.
But in many cases this makes it impractical to rely on inhibitor locks.
For example, in Debian there are several convoluted and archaic
workarounds that divert systemctl/reboot to some hacky custom scripts
to try and enforce blocking accidental reboots, when it's not expected
that the requestor will remember to specify the command line option
to enable checking for active inhibitor locks.
Also in many cases one wants to ensure that locks taken by a user are
respected by actions initiated by that same user.
Change logind so that inhibitors checks are not skipped in these
cases, and systemctl so that locks are checked in order to show a
friendly error message rather than "permission denied".
Add new block-weak and delay-weak modes that keep the previous
behaviour unchanged.
Automatically softreboot if the nextroot has been set up with an OS
tree, or automatically kexec if a kernel has been loaded with kexec
--load.
Add SYSTEMCTL_SKIP_AUTO_KEXEC and SYSTEMCTL_SKIP_AUTO_SOFT_REBOOT to
skip the automated switchover.
This part of the copyright blurb stems from the GPL use recommendations:
https://www.gnu.org/licenses/gpl-howto.en.html
The concept appears to originate in times where version control was per
file, instead of per tree, and was a way to glue the files together.
Ultimately, we nowadays don't live in that world anymore, and this
information is entirely useless anyway, as people are very welcome to
copy these files into any projects they like, and they shouldn't have to
change bits that are part of our copyright header for that.
hence, let's just get rid of this old cruft, and shorten our codebase a
bit.
Files which are installed as-is (any .service and other unit files, .conf
files, .policy files, etc), are left as is. My assumption is that SPDX
identifiers are not yet that well known, so it's better to retain the
extended header to avoid any doubt.
I also kept any copyright lines. We can probably remove them, but it'd nice to
obtain explicit acks from all involved authors before doing that.
Usually, we place the #pragma once before the copyright blurb in header files,
but in a few cases we didn't. Move those around, so that we do the same thing
everywhere.
Daan De Meyer
Luca Boccassi
Lennart Poettering
Deepak Rawat
Yu Watanabe
Zbigniew Jędrzejewski-Szmek
Daniel Mack
Kay Sievers