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-rw-r--r--nixpkgs/pkgs/build-support/docker/default.nix3
1 files changed, 2 insertions, 1 deletions
diff --git a/nixpkgs/pkgs/build-support/docker/default.nix b/nixpkgs/pkgs/build-support/docker/default.nix
index 9369e7d3158f..ffe5d69ec90d 100644
--- a/nixpkgs/pkgs/build-support/docker/default.nix
+++ b/nixpkgs/pkgs/build-support/docker/default.nix
@@ -117,7 +117,8 @@ rec {
         --tmpdir=$TMPDIR \
         --override-os ${os} \
         --override-arch ${arch} \
-        copy "$sourceURL" "docker-archive://$out:$destNameTag"
+        copy "$sourceURL" "docker-archive://$out:$destNameTag" \
+        | cat  # pipe through cat to force-disable progress bar
     '';
 
   # We need to sum layer.tar, not a directory, hence tarsum instead of nix-hash.