preflight checks

.vscode/numbered-bookmarks.json

@@ -1,19 +1,3 @@
 {
-	"bookmarks": [
+	"bookmarks": []
-		{
-			"fsPath": "$ROOTPATH$/borghelper.sh",
-			"bookmarks": [
-				-1,
-				8,
-				-1,
-				-1,
-				-1,
-				-1,
-				-1,
-				-1,
-				-1,
-				-1
-			]
-		}
-	]
 }

borghelper.sh

@@ -101,3 +101,29 @@ while [ $# -gt 0 ]; do
     shift
 done
 
+
+### check parameter validity
+
+# no operation
+if [ -z "$operation" ]; then
+    consoleError 1 'Nothing to do!'
+fi
+
+# list without archive
+if [ "$operation" = 'list' ] && [ -z "$archiveName" ]; then
+    consoleError 1 "List operation requested but no archive name provided. Please use '--list-all' for a list of all available archives."
+fi
+
+# restore with no path
+if [ "$operation" = 'restore' ] && [ -z "$restorePath" ]; then
+    consoleError 1 "Restore operation requested but no restore path provided."
+# restore with no archive
+elif [ "$operation" = 'restore' ] && [ -z "$archiveName" ]; then
+    consoleError 1 "Restore operation requested but no archive name provided."
+fi
+
+# file provided but no archive
+if [ "$fileName" ] && [ -z "$archiveName" ]; then
+    consoleError 1 "Filename specified without an associated archive name."
+fi
+