lnl-overlay.nix

self: super:

{
  # Install overlay:
  # $ mkdir -p ~/.config/nixpkgs/overlays
  # $ curl https://gist.githubusercontent.com/LnL7/570349866bb69467d0caf5cb175faa74/raw/3f3d53fe8e8713ee321ee894ecf76edbcb0b3711/lnl-overlay.nix -o ~/.config/nixpkgs/overlays/lnl.nix
  userPackages = super.userPackages or {} // {

    # Example:
    hello = self.hello;
    # add more packages here...

    # Default packages:
    # cacert = self.cacert;
    # nix = self.nix;  # don't enable this on multi-user.

    nix-rebuild = super.writeScriptBin "nix-rebuild" ''
      #!${super.stdenv.shell}
      if ! command -v nix-env &>/dev/null; then
          echo "warning: nix-env was not found in PATH, add nix to userPackages" >&2
          PATH=${self.nix}/bin:$PATH
      fi
      exec nix-env -f '<nixpkgs>' -r -iA userPackages "$@"
    '';

  };
}

@ppenguin You’ll have to show your packages.nix (or at least line 13), because the period there isn’t in the package name, it’s just part of the attribute path.

If the period was part of the package name (like in my case I have a package named apollo-2.30.2) you have to quote the name, like nixpkgs."apollo-2.30.2"), but that’s not the case here. What you have here is just a syntax error and I can’t diagnose it without seeing the code.

@lilyball thanks for the quick reply, my packages.nix:

self: super:
# Packages exposed as part of nixpkgs.userPackages
{
  inherit (self)
        aspell
        bc
        coreutils
        gdb
        # ... 
        # gnome3.dconf-editor
        # xorg.xdpyinfo
        # xorg.xev
        # ...
    ;
}

If I don't comment out the above lines with the ., I get the mentioned error, but if I don't use the full attribute path (i.e. when I just have e.g. xev in the file), the package is not found:

$ nix-rebuild
at: (3:2) in file: /home/ppenguin/.config/nixpkgs/packages.nix

     2| # Packages exposed as part of nixpkgs.userPackages
     3| {
      |  ^
     4|   inherit (self)

attribute 'xev' missing

$  nix-env -qaP '.*xev.*' | cat
nixos.xorg.xev  xev-1.2.3

If I quote like this "xorg.xev" or like this "nixos.xorg.xev", it also gives me the attribute missing error.

I'm using the latest script you posted.

@ppenguin You can’t use dotted paths in inherit like that. You’ll have to write it like

{
  inherit (self)
        aspell
        bc
        coreutils
        gdb
    ;
  inherit (self.gnome3)
        dconf-editor
    ;
  inherit (self.xorg)
        xdpyinfo
        xev
    ;
}

@lilyball Thanks a lot, that's something I'd have figured out by myself about a few decades later 😁

does this need to be setup for every channel?

@lilyball thanks for sharing that, looks great. I'm getting an infinite recursion error when trying to use your 2020 version (The older one works fine).

nix-env -f '' -r -iA userPackages
error: infinite recursion encountered, at /home/user/.config/nixpkgs/overlays/packages.nix:4:17

Any idea what could be causing this?

@Amir-Ahmad What does your packages.nix look like?

@lilyball I was trying with this, copied from your comment https://gist.github.com/LnL7/570349866bb69467d0caf5cb175faa74#gistcomment-3372828.

self: super:
# Packages exposed as part of nixpkgs.userPackages
{
  inherit (self)
    fish tmux
    # …
    ;
}

@Amir-Ahmad Oh I think you probably put this in ~/.config/nixpkgs/overlays/ directly, yes? I suppose I should have elaborated. Your directory structure should look like

~/.config/nixpkgs/overlays/
    userPackages/
        default.nix
        packages.nix

The nested folder name (userPackages above) doesn't matter, but the two files do need to be nested in a folder, and the main file is default.nix in this folder.

What this does is it makes userPackages/default.nix to be the actual overlay, and that in turn imports ./packages.nix to construct the userPackages set. By putting both files in the top level overlays folder you instead make them two separate overlays and the packages.nix file is then trying to overwrite each package with itself, which causes infinite recursion.

@lilyball It's working now! thanks for the explanation 👍