#!/bin/bash

# Copyright 2021 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# This is a script to control the logging behavior of the daemons writing into
# net.log.
# This is not meant to be run from crosh, but from a shell in developer mode.

set_verbose_logging_on_reboot_all() {
  CACHE_PATH=/var/cache/modem-utilities
  for file_name in log_shill_verbose3 log_modemfwd_debug log_mm_debug; do
    file_path="${CACHE_PATH}/${file_name}"
    case "${1}" in
      true)
        if [ -L "${file_path}" ]; then
          echo "Error: Symlink detected."
          exit 1
        fi
        touch "${file_path}"
        # Keep shill-scripts as the group owner of the file in case `modem`
        # needs to write into it later on.
        chown :shill-scripts "${file_path}"
        chmod 664 "${file_path}"
        ;;
      false)
        rm -f "${file_path}"
        ;;
      *)
        echo "'${1}' is not a valid option."
        exit 1
        ;;
    esac
  done
}

usage() {
  echo "Usage: $(basename "$0") <command> [args...]"
  echo "  set-verbose-logging-on-reboot-all <true/false>   Enable or " \
    "disable sticky verbose logging. ModemManager will be set to DEBUG, " \
    "shill to verbose level -3, and modemfwd to DEBUG. This configuration " \
    "will survive reboots."
  exit 0
}

main() {
  if ! crossystem "cros_debug?1"; then
    echo "This script can only be executed in developer mode."
    exit 1
  fi
  [ -z "$1" ] && echo "Missing argument: ${1}" && usage
  cmd="${1}"
  shift
  case "${cmd}" in
    set-verbose-logging-on-reboot-all)
      set_verbose_logging_on_reboot_all "$@"
      ;;
    --help)
      usage
      return 0
      ;;
    *)
      echo "Unknown option ${cmd}"
      usage
      exit 1
      ;;
  esac
}

main "$@"