Adding 'open' function

tagfs/tagfs.py

@@ -257,10 +257,27 @@ class TagFS(fuse.Operations):
 
 
     # File
-
+    # -------------------------------------------------------------------------
     def open(self, path, flags):
         logging.debug("open")
-        return os.open(self._fullpath(path), flags)
+
+        currtags = self._path2tags(path)
+        files    = self.index.tags2files(currtags)
+
+        if len(files) > 1:
+            raise IsADirectoryError("Is a directory: '{}'".format(path))
+
+        if len(files) == 0:
+            raise FileNotFoundError(
+                    "No such file or directory: '{}'" \
+                            .format(path)
+                                   )
+        
+        if len(files) == 1:
+            my_file_id   = files.pop()
+            my_file_real = self._realfile(my_file_id)
+
+            return os.open(my_file_real, flags)
 
     def create(self, path, mode, fi=None):
         logging.debug("create")