Sync environment variables from the user session into systemd and dbus

We're already syncing environment variables from the systemd user
manager into the user session, but some variables may be set in the user
session that aren't in the user manager or dbus-daemon by default. This
interferes with applications that are launched by the user manager or
dbus-daemon, such as Ptyxis and Kicksecure's fm-shim system.

Sync environment variables from the user session into the systemd user
manager and dbus-daemon to fix this.

Fixes: QubesOS/qubes-issues#10759
Fixes: QubesOS/qubes-issues#10712

Author: ArrayBolt3

appvm-scripts/usrbin/qubes-session

@@ -51,6 +51,10 @@ VMTYPE=$(/usr/bin/qubesdb-read /qubes-vm-type)
 UPDTYPE=$(/usr/bin/qubesdb-read /qubes-vm-updateable)
 [[ $UPDTYPE == 'True' ]] && UPDTYPE="UpdateableVM" || UPDTYPE="NonUpdateableVM"
 
+# Sync environment variables from the user session into the systemd user
+# manager and dbus-daemon
+dbus-update-activation-environment --systemd --all
+
 # process /etc/xdg/autostart and friends (according to Desktop Application
 # Autostart Specification)
 /usr/bin/qubes-session-autostart QUBES X-QUBES "X-$VMTYPE" "X-$UPDTYPE"