shutdown disrepects dry-run (e.g. shutdown -k 120, shutdown -k -c)

[pajod]

systemd version the issue has been seen with

255.4-1ubuntu8

Used distribution

Ubuntu 24.04

Linux kernel version used

6.8.0-31-generic #31-Ubuntu

CPU architectures issue was seen on

None

Component

systemctl

Expected behaviour you didn't see

-k Do not halt, power off, or reboot, but just write the wall message.

Unexpected behaviour you saw

arg_when sets (or overrides existing) scheduled shutdown anyway

The dry_run is prefixed to the action and read back, but later in update_schedule_file I can see no branch on m->shutdown_dry_run and I wonder why reset_scheduled_shutdown resets it.

Was partially fixed in #1220

Steps to reproduce the problem

shutdown -k 120

Additional program output to the terminal or log subsystem illustrating the issue

cat /run/systemd/shutdown/scheduled
USEC=1337
WARN_WALL=0
MODE=poweroff