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I’m trying to install material shell which is only in unstable right now.

I’m using the guide from the wiki to install a package from unstable along with this post on adding unstable without using a channel.

The configuration looks like:

let
  unstableTarball =
    fetchTarball
      https://github.com/NixOS/nixpkgs-channels/archive/nixos-unstable.tar.gz;
in
{

  nixpkgs.config = {
    packageOverrides = pkgs: {
      unstable = import unstableTarball {
        config = config.nixpkgs.config;
      };
    };
  };

  # List packages installed in system profile. To search, run:
  # $ nix search wget
  environment.systemPackages = with pkgs; [
    unstable.gnomeExtensions.material-shell
  ];

}

I am able to install gnome extensions from 20.09 with no errors. I am able to install packages from unstable with no errors. When I try to install “unstable.gnomeExtensions.material-shell” I get the following build error:

building Nix...
building the system configuration...
error: attribute 'material-shell' missing, at /cfg/configuration.nix:102:5
(use '--show-trace' to show detailed location information)

I’ve tried installing through both environment.systemPackages in my configuration.nix and my home.packages in my home.nix.

Do I need to use a different package name to get this to work?

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2
  • Did you update the unstable channel? For NixOS configuration, you will need to update it with sudo. – Jan Tojnar Jan 30 at 15:11
  • I've added some more detail to clarify. I'm using the unstable tarball in the configuration rather than setting the channel up outside my configuration.nix. A full example is now in the post. – ciferkey Jan 30 at 16:50
3

https://github.com/NixOS/nixpkgs-channels repository has been deprecated and is no longer updated; the channel branches are now part of the main repo. You will need to switch to https://github.com/NixOS/nixpkgs/archive/nixos-unstable.tar.gz

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1
  • This resolved the issue! Thanks. – ciferkey Jan 31 at 1:29

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