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-rw-r--r--resource/image.go3
1 files changed, 3 insertions, 0 deletions
diff --git a/resource/image.go b/resource/image.go
index 1914b3c04..208a0e9fb 100644
--- a/resource/image.go
+++ b/resource/image.go
@@ -112,6 +112,9 @@ type Image struct {
copyToDestinationInit sync.Once
+ // Lock used when creating alternate versions of this image.
+ createMu sync.Mutex
+
imaging *Imaging
hash string