bundles/pacman: add opt-in unattended-upgrades

bundles/pacman/files/check_unattended_upgrades

@@ -0,0 +1,38 @@
+#!/bin/bash
+
+statusfile="/var/tmp/unattended_upgrades.status"
+if ! [[ -f "$statusfile" ]]
+then
+    echo "Status file not found"
+    exit 3
+fi
+
+mtime=$(stat -c %Y $statusfile)
+now=$(date +%s)
+if (( $now - $mtime > 60*60*24*8 ))
+then
+    echo "Status file is older than 8 days!"
+    exit 3
+fi
+
+exitcode=$(cat $statusfile)
+case "$exitcode" in
+    abort_ssh)
+        echo "Upgrades skipped due to active SSH login"
+        exit 1
+        ;;
+    0)
+        if [[ -f /var/run/reboot-required ]]
+        then
+            echo "OK, but updates require a reboot"
+            exit 1
+        else
+            echo "OK"
+            exit 0
+        fi
+        ;;
+    *)
+        echo "Last exitcode was $exitcode"
+        exit 2
+        ;;
+esac