nix-darwin/pkgs/nix-tools/darwin-rebuild.sh

#! @shell@
set -e
set -o pipefail
export PATH=@path@:$PATH


showSyntax() {
  echo "darwin-rebuild [--help] {edit | switch | activate | build | check | changelog}" >&2
  echo "               [--list-generations] [{--profile-name | -p} name] [--rollback]" >&2
  echo "               [{--switch-generation | -G} generation] [--verbose...] [-v...]" >&2
  echo "               [-Q] [{--max-jobs | -j} number] [--cores number] [--dry-run]" >&1
  echo "               [--keep-going] [-k] [--keep-failed] [-K] [--fallback] [--show-trace]" >&2
  echo "               [-I path] [--option name value] [--arg name value] [--argstr name value]" >&2
  exec man darwin-rebuild
  exit 1
}

# Parse the command line.
origArgs=("$@")
extraBuildFlags=()
extraProfileFlags=()
profile=@profile@
action=

while [ $# -gt 0 ]; do
  i=$1; shift 1
  case $i in
    --help)
      showSyntax
      ;;
    edit|switch|activate|build|check|changelog)
      action=$i
      ;;
    --show-trace|--no-build-hook|--dry-run|--keep-going|-k|--keep-failed|-K|--verbose|-v|-vv|-vvv|-vvvv|-vvvvv|--fallback|-Q)
      extraBuildFlags+=("$i")
      ;;
    -j[0-9]*)
      extraBuildFlags+=("$i")
      ;;
    --max-jobs|-j|--cores|-I)
      if [ $# -lt 1 ]; then
        echo "$0: '$i' requires an argument"
        exit 1
      fi
      j=$1; shift 1
      extraBuildFlags+=("$i" "$j")
      ;;
    --arg|--argstr|--option)
      if [ $# -lt 2 ]; then
        echo "$0: '$i' requires two arguments"
        exit 1
      fi
      j=$1
      k=$2
      shift 2
      extraBuildFlags+=("$i" "$j" "$k")
      ;;
    --list-generations)
      action="list"
      extraProfileFlags=("$i")
      ;;
    --rollback)
      action="rollback"
      extraProfileFlags=("$i")
      ;;
    --switch-generation|-G)
      action="rollback"
      if [ $# -lt 1 ]; then
        echo "$0: '$i' requires an argument"
        exit 1
      fi
      j=$1; shift 1
      extraProfileFlags=("$i" "$j")
      ;;
    --profile-name|-p)
      if [ -z "$1" ]; then
        echo "$0: '$i' requires an argument"
        exit 1
      fi
      if [ "$1" != system ]; then
        profile="/nix/var/nix/profiles/system-profiles/$1"
        mkdir -p -m 0755 "$(dirname "$profile")"
      fi
      shift 1
      ;;
    *)
      echo "$0: unknown option '$i'"
      exit 1
      ;;
  esac
done

if [ -z "$action" ]; then showSyntax; fi

if ! [ "$action" = build ]; then
  extraBuildFlags+=("--no-out-link")
fi

if [ "$action" = edit ]; then
  darwinConfig=$(nix-instantiate --find-file darwin-config)
  exec "${EDITOR:-vi}" "$darwinConfig"
fi

if [ "$action" = switch -o "$action" = build -o "$action" = check ]; then
  echo "building the system configuration..." >&2
  systemConfig="$(nix-build '<darwin>' "${extraBuildFlags[@]}" -A system)"
fi

if [ "$action" = list -o "$action" = rollback ]; then
  if [ "$USER" != root -a ! -w $(dirname "$profile") ]; then
    sudo nix-env -p "$profile" "${extraProfileFlags[@]}"
  else
    nix-env -p "$profile" "${extraProfileFlags[@]}"
  fi
fi

if [ "$action" = rollback ]; then
  systemConfig="$(cat $profile/systemConfig)"
fi

if [ "$action" = activate ]; then
  systemConfig=$(readlink -f "${0%*/sw/bin/darwin-rebuild}")
fi

if [ -z "$systemConfig" ]; then exit 0; fi

if [ "$action" = switch ]; then
  if [ "$USER" != root -a ! -w $(dirname "$profile") ]; then
    sudo nix-env -p "$profile" --set "$systemConfig"
  else
    nix-env -p "$profile" --set "$systemConfig"
  fi
fi

if [ "$action" = switch -o "$action" = activate -o "$action" = rollback ]; then
  "$systemConfig/activate-user"

  if [ "$USER" != root ]; then
    sudo "$systemConfig/activate"
  else
    "$systemConfig/activate"
  fi
fi

if [ "$action" = changelog ]; then
  echo >&2
  echo "CHANGELOG" >&2
  echo >&2
  head -n 32 "$systemConfig/darwin-changes"
  echo >&2
fi

if [ "$action" = check ]; then
  export checkActivation=1
  "$systemConfig/activate-user"
fi