Change Details

This is to enable older versions of nix which don't add cache.nixos.org as a substituter by default. Also fix the sed find logic.

https://phab.comm.dev/D5563#164976 This is to enable older versions of nix which don't add cache.nixos.org as a substituter by default. Also fix the sed find logic.

https://phab.comm.dev/D5563#164976 This is to enable older versions of nix which don't add cache.nixos.org as a substituter by default. Also fix the sed find logic.