Hello
I would like to get the meta data about nixpkgs unstable
something like
builtins.fetchGit { url = "https://github.com/NixOS/nixpkgs-channels/tree/nixpkgs-unstable"; }
{ ... rev= ... } (date= .. would also be nice)
after retrieving the set of meta data I would like to dump that as json file.
How to do that is an short and efficient way in nix