From 4d486b6e7af9a0c2546256e1c871eb35bb4ef8d1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=BCrg=20Billeter?= <j@bitron.ch>
Date: Wed, 4 Dec 2019 18:01:33 +0100
Subject: _casbaseddirectory.py: Add _reset() method

This reinitializes a CASBasedDirectory object from a directory digest.
---
 src/buildstream/storage/_casbaseddirectory.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/buildstream/storage/_casbaseddirectory.py b/src/buildstream/storage/_casbaseddirectory.py
index f90d5c503..d6ebc6f75 100644
--- a/src/buildstream/storage/_casbaseddirectory.py
+++ b/src/buildstream/storage/_casbaseddirectory.py
@@ -103,9 +103,14 @@ class CasBasedDirectory(Directory):
         self.filename = filename
         self.common_name = common_name
         self.cas_cache = cas_cache
-        self.__digest = digest
+        self.__digest = None
         self.index = {}
         self.parent = parent
+        self._reset(digest=digest)
+
+    def _reset(self, *, digest=None):
+        self.__digest = digest
+        self.index = {}
         if digest:
             self._populate_index(digest)
 
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