Description

systemd v257 comes with a nice new technology: varlink With soft-reboot, the rebootmgr dbus interface needs a clean rewrite anyways, so change that to sd-varlink. Problem: sd-varlink in systemd v257 is not documented, Lennarts comment: who is interested to use that should look at the code.

Goals

Have at least a minimal server/client with polkit authentication running.

Sources

• https://github.com/thkukuk/rebootmgr3

Results

• At first fix upstream to make a simple non-systemd App linking against sd-varlink, PR: https://github.com/systemd/systemd/pull/35240
• First communication to get rebootmgr status:

  # echo "{}" | varlinkctl call /tmp/rebootmgr.socket org.openSUSE.rebootmgr.Status
  {
     "RebootStatus" : 1,
     "RebootMethod" : "soft-reboot"
  }

• Server communication is fully implemented (except one sd_json problem...), client can at least trigger a reboot:

  # ./rebootmgrd -d
  Starting rebootmgrd (rebootmgr) 3.0...
  Varlink method "Reboot" called...
  Reboot request: 1, force: 0

  Client:

  # ./rebootmgrctl reboot
  method=1, forced=0
  Segmentation fault (core dumped)

  Ok, who cares that the client seg.faults at the end, the main thing is the machine will reboot
• rebootmgrctl [status|status --full|reboot|cancel] is implemented and works:

  Starting rebootmgrd (rebootmgr) 3.0...
  Varlink method "Reboot" called...
  Reboot request: reboot, force: false
  Reboot in 18310 seconds at Sat 2024-11-23 03:59:43 CET
  Varlink method "Cancel" called...
  Varlink method "Reboot" called...
  Reboot request: reboot, force: false
  Reboot in 18595 seconds at Sat 2024-11-23 04:04:46 CET
  time_handler called

• polkit: the sd-varlink polkit authentication support is systemd internal, so needs another 1-2 hackweeks to write support from scratch.