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These operations might require slow I/O, and thus might block PID1's main
loop for an undeterminated amount of time. Instead of performing them
inline, fork a worker process and stash away the D-Bus message, and reply
once we get a SIGCHILD indicating they have completed. That way we don't
break compatibility and callers can continue to rely on the fact that when
they get the method reply the operation either succeeded or failed.
To keep backward compatibility, unlike reload control processes, these
are ran inside init.scope and not the target cgroup. Unlike ExecReload,
this is under our control and is not defined by the unit. This is necessary
because previously the operation also wasn't ran from the target cgroup,
so suddenly forking a copy-on-write copy of pid1 into the target cgroup
will make memory usage spike, and if there is a MemoryMax= or MemoryHigh=
set and the cgroup is already close to the limit, it will cause an OOM
kill, where previously it would have worked fine.
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.
Update frameworks that work automatically in the background
occasionally need to schedule reboots. Systemd-logind already
provides a nice mechanism to schedule shutdowns, send notfications
and block logins short before the time. Systemd has a framework for
calendar events, so we may conveniently use logind to define a
maintenance time for reboots.
The existing ScheduleShutdown DBus method in logind expects a usec_t
with an absolute time. Passing USEC_INFINITY as magic value now tells
logind to take the time from the configured maintenance time if set.
"shutdown -r" leverages that and uses the maintenance time
automatically if configured. The one minute default is still used if
nothing was specified.
Similarly the new 'auto' setting for the --when parameter of systemctl
uses the maintenance time if configured or a one minute timer like the
shutdown command.
Like much English text, the systemd documentation uses "may not" in the
sense of both "will possibly not" and "is forbidden to". In many cases
this is OK because the context makes it clear, but in others I felt it
was possible to read the "is forbidden to" sense by mistake: in
particular, I tripped over "the target file may not exist" in
systemd.unit(5) before realizing the correct interpretation.
Use "might not" or "may choose not to" in these cases to make it clear
which sense we mean.
In the majority of cases, this is caused by
sleep_supported() returning error. Hence it's
very likely that it would fail again, so
the fallback is not really useful. Instead,
honor the --force option for these verbs.
TEST-26-SYSTEMCTL is racy as we call systemctl is-active immediately
after systemctl kill. Let's implement --wait for systemctl kill and
use it in TEST-26-SYSTEMCTL to avoid the race.
This is a fancy wrapper around "cat <<EOF", but:
- the user doesn't need to figure out the file name,
- parent directories are created automatically,
- daemon-reload is implied,
so it's a convenient way to create units or drop-ins.
Closes https://github.com/systemd/systemd/issues/21862.
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.
Instead of mounting over, do an atomic swap using mount beneath, if
available. This way assets can be mounted again and again (e.g.:
updates) without leaking mounts.
As I noticed a lot of missing information when trying to implement checking
for missing info. I reimplemented the version information script to be more
robust, and here is the result.
Follow up to ec07c3c80b
This tries to add information about when each option was added. It goes
back to version 183.
The version info is included from a separate file to allow generating it,
which would allow more control on the formatting of the final output.
Doesn't really matter since the two unicode symbols are supposedly
equivalent, but let's better follow the unicode recommendations to
prefer greek small letter mu, as per:
https://www.unicode.org/reports/tr25
We hardcode the path the initrd uses to prepare the final mount point at
so many places, let's also imply it in "systemctl switch-root" if not
specified.
This adds the fallback both to systemctl and to PID 1 (this is because
both to — different – checks on the path).
