Add checkmodupdate command

README.asciidoc

@@ -274,6 +274,9 @@ instances.
 `checkupdate`::
     Checks if an ARK server update is available
 
+`checkmodupdate`::
+    Checks if any mods need updating on the server
+
 `installmods`::
     Installs all mods specified in the instance config into the
     `ShooterGame/Content/Mods` directory

tools/arkmanager

@@ -1924,6 +1924,26 @@ doUpdate() {
   fi
 }
 
+#
+# Check if any mod update is available
+#
+checkForModUpdate(){
+  local updateavail=
+
+  for modid in $(getModIds); do
+    if isModUpdateAvailable $modid || isModUpdateNeeded $modid; then
+      printf "Mod %d [%s] update needed\n" "$modid" "$(getModName $modid)"
+      updateavail=1
+    fi
+  done
+
+  if [ -n "$updateavail" ]; then
+    return 0
+  else
+    return 1
+  fi
+}
+
 #
 # Get the Mod IDs of the installed mods and the requested mods
 #
@@ -3102,6 +3122,9 @@ main(){
         checkupdate)
           checkForUpdate
         ;;
+	checkmodupdate)
+	  checkForModUpdate
+	;;
         installmod)
           doInstallMod "${args[@]}"
         ;;