devshell/syslog

#!/bin/bash
# Copyright 2018 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.

### Listen for logs

## usage: fx syslog [-d|--device <device>] [log-listener flags]
##
## Creates an SSH connection with a device and starts listening for logs.
## Pass -h to get help with log-listener flags.
##
## Arguments:
##   -d|--device  Fuchsia link-local name of the device. If not
##                specified, will connect to the only available
##                device on the link-local network.

source "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"/lib/vars.sh

function listen {
  trap "exit 0" INT
  while true; do
    addr=$(fx-command-run netaddr --fuchsia "${device}")
    if [[ $? -eq 0 ]]; then
      echo "Connecting to device..."
      (fx-command-exec ssh "${addr}" /system/bin/log_listener "$@" || true)
      echo "Connection lost, looking for device"
    fi
    sleep 1
  done
}

case $1 in
  -d|--device)
  shift  # name
  if [[ -z "$1" ]]; then
      echo "Missing parameter: <device>" >&2
      fx-command-help
      exit 1
  fi
  device="$1"
  shift  # value
  ;;
esac

echo "Looking for device"
listen