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-rw-r--r--pkgs/build-support/docker/default.nix6
1 files changed, 6 insertions, 0 deletions
diff --git a/pkgs/build-support/docker/default.nix b/pkgs/build-support/docker/default.nix
index edb8837015c..47fd99c12f8 100644
--- a/pkgs/build-support/docker/default.nix
+++ b/pkgs/build-support/docker/default.nix
@@ -287,6 +287,12 @@ rec {
         echo "Packing raw image..."
         tar -C mnt --hard-dereference --sort=name --mtime="@$SOURCE_DATE_EPOCH" -cf $out/layer.tar .
       '';
+
+      postUmount = ''
+        mv $out/layer.tar .
+        rm -rf $out
+        mv layer.tar $out
+      '';
     };
 
   # Create an executable shell script which has the coreutils in its