feat(steamos-update): Initial support for Universal Blue updater

Author: EyeCantCU

system_files/deck/usr/bin/steamos-update

@@ -1,24 +1,30 @@
 #!/bin/bash
 
-if command -v rpm-ostree > /dev/null; then
+if command -v ublue-update > /dev/null; then
   if [ "$1" == "check" ]; then
     if [ -f '/tmp/upgrade-installed' ]; then
       exit 7 # Upgrade already installed
     else
-      # Perform connectivity check
-      wget -q --spider https://github.com
+      # Check system state
+      ublue-update --check
       if [ $? -eq 0 ]; then
-        # Compare installation digest to latest image
-        IMAGE=$(rpm-ostree status | grep -m1 ghcr | sed 's/^.*ghcr/ghcr/')
-        CURRENT=$(rpm-ostree status | grep -m1 Digest | tr -d '[:space:]' | sed 's/'Digest:'//g')
-        LATEST=$(skopeo inspect docker://${IMAGE} | jq '.Digest' | tr -d '"')
-        if [ ${CURRENT} == ${LATEST} ]; then
-          exit 7 # Up to date
+        # Perform connectivity check
+        wget -q --spider https://github.com
+        if [ $? -eq 0 ]; then
+          # Compare installation digest to latest image
+          IMAGE=$(rpm-ostree status | grep -m1 ghcr | sed 's/^.*ghcr/ghcr/')
+          CURRENT=$(rpm-ostree status | grep -m1 Digest | tr -d '[:space:]' | sed 's/'Digest:'//g')
+          LATEST=$(skopeo inspect docker://${IMAGE} | jq '.Digest' | tr -d '"')
+          if [ ${CURRENT} == ${LATEST} ]; then
+            exit 7 # Up to date
+          else
+            exit 0 # Upgrade available
+          fi
         else
-          exit 0 # Upgrade available
+          exit 7 # Connectivity check failed
         fi
       else
-        exit 7 # Connectivity check failed
+        exit 7 # System in use
       fi
     fi
   elif [ "$1" == "--supports-duplicate-detection" ]; then
@@ -36,20 +42,20 @@ if command -v rpm-ostree > /dev/null; then
       echo 100%
     }
     upgrade() {
-      # Pull exit code from rpm-ostree
-      rpm-ostree upgrade --unchanged-exit-77
+      # Pull exit code from ublue-update
+      ublue-update
       echo $? > /tmp/upgrade-check
     }
     upgrade | fake_progress
     # Check if upgrade failed
     UPGRADE_CHECK=/tmp/upgrade-check
     rm /tmp/upgrade-check
-    if [ ${UPGRADE_CHECK} -eq 77 ]; then
-      exit 0 # Upgrade failed
-    else
+    if [ ${UPGRADE_CHECK} -eq 0 ]; then
       touch /tmp/upgrade-installed
+    else
+      exit 0 # Upgrade failed
     fi
   fi
 else
-  exit 7 # rpm-ostree not installed
+  exit 7 # ublue-update not installed
 fi