#!/bin/bash
# Copyright 2017 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

#### CATEGORY=Run, inspect and debug
### listen for kernel logs

## usage: fx klog [--raw] [-r | --remote-symbols]
##
##    --raw                   do not attempt to symbolize the log
##
##    --remote-symbols|-r     attemp to resolve symbols using predefined remote
##                            symbol servers for symbols that cannot be resolved
##                            locally. See `fx help symbolize` for more
##                            information on remote symbol servers.
##
## This command delegates to the Zircon `loglistener` binary.
## It will listen to the device specified with `fx -d DEVICE klog` or
## `fx set-device`, otherwise one of the devices on the link-local network.

set -e
set -o pipefail

source "$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"/lib/vars.sh || exit $?
fx-config-read

declare is_raw=0
declare is_remote=0

while [[ $# -ne 0 ]]; do
  case "$1" in
  -h|--help)
    fx-command-help
    exit 0
    ;;
  --raw)
    is_raw=1
    ;;
  --remote-symbols|-r)
    is_remote=1
    ;;
  *)
    fx-error Invalid syntax
    fx-command-help
    exit 1
  esac
  shift
done

if (( is_raw )) && (( is_remote )); then
  fx-error "Invalid syntax: --raw and -r cannot be used together"
  fx-command-help
  exit 1
fi

device="$(get-device-name)" || exit $?
if (( is_raw )); then
  exec "${ZIRCON_TOOLS_DIR}/loglistener" "${device}"
else
  declare symbolizer=( "fx-command-run" "symbolize" )
  if (( is_remote )); then
    symbolizer+=("-r")
  fi
  "${ZIRCON_TOOLS_DIR}/loglistener" "${device}" | "${symbolizer[@]}"
fi