io.systemd.Manager.{PowerOff,Reboot,SoftReboot,Halt,Kexec}
This adds the low-level io.systemd.Manager shutdown support. This is (much) simpler than the logind one. It mimics dbus but uses a shared helper for the simple cases. Note that this is more restrictive than the dbus version. The dbus version uses SD_BUS_VTABLE_CAPABILITY(CAP_SYS_BOOT) but the varlink version uses varlink_check_privileged_peer(link). This is mostly because I'm not sure how to do the equivalent in a race-free way. Thanks to Daan for suggesting this.
System and Service Manager
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