final: prev: {
  ensureZfsMounts = prev.writeShellApplication {
    name = "zfsEnsureMounted";
    runtimeInputs = with prev; [
      zfs
      gawk
      coreutils
    ];

    text = ''
       #!/bin/sh

       if [[ "$#" -eq "0" ]]; then
          echo "no arguments passed"
          exit 1
       fi

      MOUNTED=$(zfs list -o mountpoint,mounted -H | awk '$NF == "yes" {NF--; print}')

       MISSING=""
       for target in "$@"; do
          if ! grep -Fxq "$target" <<< "$MOUNTED"; then
             MISSING="$MISSING $target"
          fi
       done

       if [[ -n "$MISSING" ]]; then
          echo "FAILURE, missing:$MISSING" 1>&2
          exit 1
       fi
    '';
  };

  reflac = prev.writeShellApplication {
    name = "reflac";
    runtimeInputs = with prev; [ flac ];
    excludeShellChecks = [ "2086" ];

    text = builtins.readFile (
      prev.fetchurl {
        url = "https://raw.githubusercontent.com/chungy/reflac/refs/heads/master/reflac";
        sha256 = "61c6cc8be3d276c6714e68b55e5de0e6491f50bbf195233073dbce14a1e278a7";
      }
    );
  };

  jellyfin-exporter = prev.buildGoModule rec {
    pname = "jellyfin-exporter";
    version = "unstable-2025-03-27";
    src = prev.fetchFromGitHub {
      owner = "rebelcore";
      repo = "jellyfin_exporter";
      rev = "8e3970cb1bdf3cb21fac099c13072bb7c1b20cf9";
      hash = "sha256-wDnhepYj1MyLRZlwKfmwf4xiEEL3mgQY6V+7TnBd0MY=";
    };
    vendorHash = "sha256-e08u10e/wNapNZSsD/fGVN9ybMHe3sW0yDIOqI8ZcYs=";
    # upstream tests require a running Jellyfin instance
    doCheck = false;
    meta.mainProgram = "jellyfin_exporter";
  };

  igpu-exporter = prev.buildGoModule rec {
    pname = "igpu-exporter";
    version = "unstable-2025-03-27";
    src = prev.fetchFromGitHub {
      owner = "mike1808";
      repo = "igpu-exporter";
      rev = "db2dace1a895c2b950f6d3ba1a2e46729251d124";
      hash = "sha256-xWTiu26UzTZIK/6jeda+x6VePUgoWTS0AekejFdgFWs=";
    };
    vendorHash = "sha256-oeCSKwDKVwvYQ1fjXXTwQSXNl/upDE3WAAk680vqh3U=";
    subPackages = [ "cmd" ];
    postInstall = ''
      mv $out/bin/cmd $out/bin/igpu-exporter
    '';
    meta.mainProgram = "igpu-exporter";
  };

  mc-monitor = prev.buildGoModule rec {
    pname = "mc-monitor";
    version = "0.16.1";
    src = prev.fetchFromGitHub {
      owner = "itzg";
      repo = "mc-monitor";
      rev = version;
      hash = "sha256-/94+Z9FTFOzQHynHiJuaGFiidkOxmM0g/FIpHn+xvJM=";
    };
    vendorHash = "sha256-qq7rIpvGRi3AMnBbi8uAhiPcfSF4McIuqozdtxB5CeQ=";
    # upstream tests probe live Minecraft servers
    doCheck = false;
    meta.mainProgram = "mc-monitor";
  };
}