autoload -Uz log_debug log_error log_info log_status log_group log_output log_warning

local -r _usage="Usage: %B${0}%b <source> <volume name> <output_name>

Create macOS disk image <volume name> <output_name> with contents of <source>"

if (( ! # )) {
  log_error 'Called without arguments.'
  log_output ${_usage}
  return 2
}

local source=${1}
local volume_name=${2}
local output_name=${3}

log_group "Create macOS disk image"

trap "safe_hdiutil detach /Volumes/${output_name}; rm temp.dmg; log_group; return 2" ERR

safe_hdiutil() {
  local _status=0
  local -r -a _backoff=(2 5 10 15 30)

  for i ({1..5}) {
    hdiutil ${@} && _status=0 || _status=1

    if (( _status )) {
      log_warning "Unable to run 'hdiutil ${@}' (attempt #${i}). Retrying."
      if (( ${+CI} )) sudo pkill -9 XProtect >/dev/null || true
      sleep ${_backoff[${i}]}
    } else {
      break
    }
  }

  if (( _status )) {
    log_error "Unable to run 'hdiutil ${@}'. Aborting"
    log_group
    return 2
  }
}

safe_hdiutil create \
  -volname "${volume_name}" \
  -srcfolder ${source} \
  -ov \
  -fs HFS+ \
  -format UDRW \
  temp.dmg
safe_hdiutil attach \
  -noverify \
  -readwrite \
  -mountpoint /Volumes/${output_name} \
  temp.dmg

log_info "Waiting 2 seconds to ensure mounted volume is available..."
sleep 2
log_status "Done"
log_info "Setting up disk volume..."
log_status "Volume icon"
SetFile -c icnC /Volumes/${output_name}/.VolumeIcon.icns
log_status "Icon positions"
osascript package.applescript ${output_name}
log_status "File permissions"
chmod -Rf go-w /Volumes/${output_name}
SetFile -a C /Volumes/${output_name}
rm -rf -- /Volumes/${output_name}/.fseventsd(N)
log_info "Converting disk image..."

safe_hdiutil detach /Volumes/${output_name}

safe_hdiutil convert \
  -format ULFO \
  -ov \
  -o ${output_name}.dmg temp.dmg

rm temp.dmg

trap '' ERR

log_group

return 0