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-rw-r--r--src/buildstream/_cas/cascache.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/buildstream/_cas/cascache.py b/src/buildstream/_cas/cascache.py
index ba520851c..53f6029db 100644
--- a/src/buildstream/_cas/cascache.py
+++ b/src/buildstream/_cas/cascache.py
@@ -367,6 +367,9 @@ class CASCache():
# Exactly one of the two parameters has to be specified
assert (path is None) != (buffer is None)
+ # If we're linking directly, then path must be specified.
+ assert (not link_directly) or (link_directly and path)
+
if digest is None:
digest = remote_execution_pb2.Digest()