Added Session manager page

docs/alpine-desktop-setup/graphical-session/session-manager.md

@@ -0,0 +1,23 @@
+# Session manager
+
+To be able to run a graphical enviroment it's necessary to run a seat and session manager. It's recommended to use `seatd` in conjunction with `turnstile` and `pam_rundir` for a minimal setup:
+
+```
+# apk add seatd turnstile pam-rundir
+# rc-update add seatd default
+# rc-update add turnstiled default
+```
+
+Then make sure `pam_rundir` exports `XDG_RUNTIME_DIR` by uncommenting its line in `/etc/pam.d/base-session`:
+
+```
+session optional pam_rundir.so
+```
+
+And turn off `manage_rundir` in `/etc/turnstile/turnstiled.conf`:
+
+```
+manage_rundir = no
+```
+
+> Also make sure your user is in the `seat` group.

docs/alpine-desktop-setup/post-install/users.md

@@ -29,7 +29,7 @@ And create a `_power` group for user's to be able to poweroff the system without
 Adding a user in alpine can be done using the `setup-user` script. Here we can specify the name, fullname, groups and more:
 
 ```
-# setup-user -g wheel,plugdev,_seatd,nix,_power -f "<Full Name>" <username>
+# setup-user -g wheel,plugdev,seat,nix,_power -f "<Full Name>" <username>
 # passwd <username>
 ```
 
@@ -106,7 +106,7 @@ $ fscrypt status /home/<username>
 If you have already set up a system with a user but want to add another do this:
 
 ```
-# setup-user -g (wheel,)plugdev,_seatd,nix,_power -f "<Full Name>" <username>
+# setup-user -g (wheel,)plugdev,seat,nix,_power -f "<Full Name>" <username>
 # passwd <username>
 [Change shell in /etc/passwd]
 # fscrypt encrypt /home/<username> --user=<username> # Doesn't work yet