{ versionsPath }:

let
  channelVersions = (import versionsPath);
  mkChannelSource = name:
    let
      channelVersion = builtins.getAttr name channelVersions;
    in builtins.fetchGit {
      # Descriptive name to make the store path easier to identify
      inherit name;
      inherit (channelVersion) url ref rev;
  };
  nixPath = builtins.concatStringsSep ":" (builtins.map (elemName:
    let
      elem = builtins.getAttr elemName channelVersions;
      elemPath = (mkChannelSource elemName);
      suffix = if builtins.hasAttr "suffix" elem then elem.suffix else "";
    in
      builtins.concatStringsSep "=" [ elemName elemPath ] + suffix
  ) (builtins.attrNames channelVersions));
  pkgs = import (mkChannelSource "nixpkgs") {};
in

{
  inherit nixPath;
  channelSources = pkgs.writeText "channels.rc" ''
    export NIX_PATH=${nixPath}
  '';
}