install.sh

#!/bin/sh

printf "checking for nixbld group... "
/usr/bin/dscl . -read /Groups/nixbld &> /dev/null
case $? in
  0) echo "yes" ;;
  56)
    echo "no, created"
    sudo /usr/sbin/dseditgroup -o create -r "Nix build group for nix-daemon" -i 30000 nixbld >&2 || exit
    ;;
esac

for i in $(seq 1 10); do
  printf "checking for nixbld$i user... "
  /usr/bin/id nixbld$i &> /dev/null
  case $? in
    0) echo "yes" ;;
    1)
      echo "no, created"
      sudo /usr/sbin/sysadminctl -fullName "Nix build user $i" -home /var/empty -shell /sbin/nologin -UID $(expr 30000 + $i) -addUser nixbld$i >&2 || exit  # -shell /sbin/nologin
      sudo dscl . -create /Users/nixbld$i IsHidden 1 || exit
      sudo dscl . -create /Users/nixbld$i UserShell /sbin/nologin || exit
      ;;
  esac

  printf "checking group of nixbld$i user... "
  if test "$(/usr/bin/id -g nixbld$i)" -eq 30000; then
    echo "ok"
  else
    echo "no, updated"
    sudo /usr/sbin/dseditgroup -o edit -t user -a nixbld$i nixbld
    sudo /usr/bin/dscl . -create /Users/nixbld$i PrimaryGroupID 30000 >&2 || exit
  fi
done