_artifactcache: Fix ref in update_mtime()

get_artifact_fullname() is required to construct the ref. The cache key
alone does not suffice.

2 files changed, 5 insertions, 3 deletions

diff --git a/buildstream/_artifactcache/artifactcache.py b/buildstream/_artifactcache/artifactcache.py
index 728819e81..ed5ef8262 100644
--- a/buildstream/_artifactcache/artifactcache.py
+++ b/buildstream/_artifactcache/artifactcache.py
@@ -268,7 +268,7 @@ class ArtifactCache():
             for key in (strong_key, weak_key):
                 if key:
                     try:
-                        self.update_mtime(key)
+                        self.update_mtime(element, key)
                     except ArtifactError:
                         pass
 
@@ -483,9 +483,10 @@ class ArtifactCache():
     # Update the mtime of an artifact.
     #
     # Args:
+    #     element (Element): The Element to update
     #     key (str): The key of the artifact.
     #
-    def update_mtime(self, key):
+    def update_mtime(self, element, key):
         raise ImplError("Cache '{kind}' does not implement update_mtime()"
                         .format(kind=type(self).__name__))
 
diff --git a/buildstream/_artifactcache/cascache.py b/buildstream/_artifactcache/cascache.py
index c1fc90bb6..a3d27c8d1 100644
--- a/buildstream/_artifactcache/cascache.py
+++ b/buildstream/_artifactcache/cascache.py
@@ -513,8 +513,9 @@ class CASCache(ArtifactCache):
         except FileNotFoundError as e:
             raise ArtifactError("Attempt to access unavailable artifact: {}".format(e)) from e
 
-    def update_mtime(self, ref):
+    def update_mtime(self, element, key):
         try:
+            ref = self.get_artifact_fullname(element, key)
             os.utime(self._refpath(ref))
         except FileNotFoundError as e:
             raise ArtifactError("Attempt to access unavailable artifact: {}".format(e)) from e