#!/bin/sh
fetch() {
  rev=$1
  output=$2
  url=${3:-https://github.com/NixOS/nixpkgs-channels.git}

  printf "\033[1m$url\033[0m $rev\n"
  nix-prefetch-git \
    --url "${url}" \
    --rev "${rev}" \
    > "${output}"
}

fetch "refs/heads/nixos-19.09" _versions/nixpkgs.json &
fetch "refs/heads/nixos-unstable" _versions/nixpkgs-unstable.json &
fetch "refs/heads/release-19.09" _versions/home-manager.json "https://github.com/rycee/home-manager.git" &
fetch "refs/tags/v1.15.0" _versions/krops.json "https://cgit.krebsco.de/krops" &
fetch "ea5b591d065b721666fc3527ad45a7545a594a77" _versions/stockholm.json "https://cgit.krebsco.de/stockholm" &
wait