Mention Polkit dependency in README.md

[lastCent]

Related to: #113

When starting dwl on a freshly installed machine without Polkit the following error is returned and dwl won't start:

00:00:00.000 [ERROR] [libseat] [libseat/backend/seatd.c:78] Could not connect to socket /run/seatd.sock: No such file or directory
00:00:00.002 [ERROR] [libseat] [libseat/backend/logind.c:267] Could not activate session: Permission denied
00:00:00.002 [ERROR] [libseat] [libseat/libseat.c:73] No backend was able to open a seat
00:00:00.002 [ERROR] [backend/session/session.c:84] Unable to create seat: Function not implemented
00:00:00.002 [ERROR] [backend/session/session.c:218] Failed to load session backend
00:00:00.002 [ERROR] [backend/backend.c:353] Failed to start a DRM session
couldn't create backend

To me it wasn't immediately clear that the absence of Polkit was the problem behind this.
I suggest adding it as a third dependency in the README.md file, or mentioning an alternative to polkit, if one exists.

[harrisonrobin]

you need seatd running

[PalanixYT]

polkit is not a dependency of dwl

[raphaelr]

wlroots depends on libseat, and libseat requires either systemd-logind, elogind, or seatd to be running. Alternatively, add your user to the video/input groups so libseat can open the hardware devices directly (but I do not recommend that because it gives every process more privileges, not just dwl).

The README already says:

Depending on your distro's setup, you may need to add your user to the video and input groups before you can run dwl on a VT.

[lastCent]

Thanks guys. I guess I must have had an issue with systemd-logind then.
I tried adding the user to video/input groups at the time, but it seemed to have no effect.

Currently I depend on the machine in question, so I'm not able to reproduce the problem at this time. Feel free to close the issue.

[raphaelr]

addendum: if using logind, then polkit has to be installed as well, otherwise it won't let dwl access the hardware. just tried it out on arch

[devgioele]

I know this is old and closed, but confirm that to run dwl as non-root requires polkit.
It is not a dependency of dwl, but it should be mentioned in the installation instructions nonetheless.

[sevz17]

I know this is old and closed, but confirm that to run dwl as non-root requires polkit. It is not a dependency of dwl, but it should be mentioned in the installation instructions nonetheless.

polkit is required when using systemd-logind|elogind; otherwise you need add yourself to the seat group and start the seatd daemon