In nix stable, nix copy ....drv --to file:///tmp/store copies just the derivation. In nix unstable, it will build and copy the output unless --derivation is passed. This is #3696.
In nix stable, nix copy ....drv --to file:///tmp/store copies just the derivation. In nix unstable, it will build and copy the output unless --derivation is passed. This is #3696.