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-rw-r--r--buildstream/_artifactcache/cascache.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/buildstream/_artifactcache/cascache.py b/buildstream/_artifactcache/cascache.py
index 3a3181bfb..3e63608be 100644
--- a/buildstream/_artifactcache/cascache.py
+++ b/buildstream/_artifactcache/cascache.py
@@ -506,7 +506,7 @@ class CASCache(ArtifactCache):
def set_ref(self, ref, tree):
refpath = self._refpath(ref)
os.makedirs(os.path.dirname(refpath), exist_ok=True)
- with utils.save_file_atomic(refpath, 'wb') as f:
+ with utils.save_file_atomic(refpath, 'wb', tempdir=self.tmpdir) as f:
f.write(tree.SerializeToString())
# resolve_ref():