feat: Autologin to gamescope-session on deck images

- Run before display manager starts

Containerfile

@@ -102,6 +102,7 @@ RUN sed -i 's@enabled=1@enabled=0@g' /etc/yum.repos.d/_copr_kylegospo-bazzite.re
     sed -i 's@enabled=1@enabled=0@g' /etc/yum.repos.d/_copr_kylegospo-latencyflex.repo && \
     sed -i 's@enabled=1@enabled=0@g' /etc/yum.repos.d/_copr_kylegospo-hl2linux-selinux.repo && \
     systemctl enable set-cfs-tweaks.service && \
+    systemctl enable gamescope-autologin.service && \
     rm -rf \
         /tmp/* \
         /var/* && \

deck/usr/bin/gamescope-autologin

@@ -0,0 +1,15 @@
+#!/bin/bash
+NUM_USERS=$(ls /home | wc -l)
+
+# If we have multiple users, don't configure SDDM
+if [ ${NUM_USERS} -eq 1 ]; then
+  # Don't configure SDDM if we already have
+  SDDM_CONF=$(cat /etc/sddm.conf)
+  if grep '#User=' <<< ${SDDM_CONF}; then
+    # Retrieve username
+    USER=$(ls /home)
+    # Configure autologin
+    sed -i 's/#Session=/Session=gamescope-session/g' /etc/sddm.conf
+    sed -i 's/#User=/User='${USER}'/g' /etc/sddm.conf
+  fi
+fi

deck/usr/lib/systemd/system/gamescope-autologin.service

@@ -0,0 +1,10 @@
+[Unit]
+Description=Enables autologin to gamescope-session
+Before=display-manager.service
+
+[Service]
+Type=oneshot
+ExecStart=/usr/bin/gamescope-autologin
+
+[Install]
+WantedBy=multi-user.target