obnam validation

src/freedombone-utils-backup

 }
 
 function restore_directory_from_usb {
+    if [ ! ${1} ]; then
+        echo "obnam restore -r $USB_MOUNT/backup/${2} --to ${1}"
+        echo $'No restore destination given'
+        return
+    fi
+    if [ ! ${2} ]; then
+        echo "obnam restore -r $USB_MOUNT/backup/${2} --to ${1}"
+        echo $'No restore source given'
+        return
+    fi
     if [ ! -d ${1} ]; then
         mkdir ${1}
     fi
 }
 
 function restore_directory_from_friend {
+    if [ ! ${1} ]; then
+        echo "obnam restore -r $SERVER_DIRECTORY/backup/${2} --to ${1}"
+        echo $'No restore destination given'
+        return
+    fi
+    if [ ! ${2} ]; then
+        echo "obnam restore -r $SERVER_DIRECTORY/backup/${2} --to ${1}"
+        echo $'No restore source given'
+        return
+    fi
     if [ ! -d ${1} ]; then
         mkdir ${1}
     fi