SUSE Hack Week: Make use of sd_varlink to replace dbus (rebootmgr)

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.

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This project is part of:

Hack Week 24

Activity

12 months ago: crameleon liked this project.

12 months ago: afeijoo liked this project.

12 months ago: epaolantonio liked this project.

12 months ago: wagi liked this project.

12 months ago: kukuk started this project.

12 months ago: kukuk originated this project.

Comments

2 days ago by Eric5797 | Reply

To replace D-Bus in rebootmgr, use sd_varlink for simpler and faster IPC communication. It offers a modern API that integrates seamlessly with systemd components. Just like optimizing the Pikashow app for Android, this approach improves performance and reduces complexity.

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