Improved file manager API functions

bin/v-list-fs-directory

@@ -15,20 +15,23 @@ fi
 
 # Checking vesta user
 if [ ! -e "$VESTA/data/users/$user" ]; then
-    exit 1
+    echo "Error: vesta user $user doesn't exist"
+    exit 3
 fi
 
 # Checking user homedir
 homedir=$(grep "^$user:" /etc/passwd | cut -f 6 -d :)
 if [ -z $homedir ]; then
-    exit 1
+    echo "Error: user home directory doesn't exist"
+    exit 12
 fi
 
 # Checking path
 if [ ! -z "$path" ]; then
     rpath=$(readlink -f "$path")
     if [ -z "$(echo $rpath |grep $homedir)" ]; then
-        exit 1
+    echo "Error: invalid path $dst_dir"
+        exit 2
     fi
 else
     path=$homedir