#!/bin/bash
#
# lxc-start script by Roberto Puzzanghera https://www.sagredo.eu
#
# This script starts a container running the lxc-start command as the
# owner user if it is unpriviledged, or as root otherwise.
#
# Usage: lxu <container_name>
#

. my_lxc-common

NAME=$1

# display the expected usage
usage() {
  echo "Usage: $0 <name>
       $0 -n <name> [-F -l <LEVEL> -o <logfile> -h]

  $0 script takes the following options:
  -n <name> Name of the container
  -F Run the container in the foreground. In this mode, the container console will be attached
     to the current tty and signals will be routed directly to the container.
     Useful when the container refuses to start.
     Use with -n <name>
  -l <LEVEL> Set log priority to LEVEL
     LEVEL can be one of the following: FATAL ALERT CRIT WARN ERROR NOTICE INFO DEBUG TRACE
  -o <FILE> Output to an alternate log FILE. The default is no log.
  -h Print help options and exit

  If used in the form
  $0 <name>
  it simply runs the container with no options."

  exit 1
}

# Define the flags the user can pass to the script
OPTIONS=""
while getopts n:Fl:o:h option
  do
    case "${option}" in
      n) NAME=${OPTARG};;
      F) OPTIONS="-F";;
      l) OPTIONS="${OPTIONS} -l ${OPTARG}";;
      o) OPTIONS="${OPTIONS} -o ${OPTARG}";;
      h) usage;;
      *) usage;;
    esac
  done

# Container name must be provided
if [ -z "$NAME" ] || [ "$NAME" == "-h" ]; then
  echo
  echo "Container name is required"
  echo
  usage
  exit 1
fi

# Exit if container does not exist
container_exists $NAME
if [ $? -eq 0 ]; then
  echo "Container $NAME does not exist. Exiting..."
  exit 1
fi

# $CONFIG file must exist. If not -F was probably provided before <name>
CONFIG=$LXC_PATH/$NAME/config
if [ ! -f "$CONFIG" ]; then
  echo
  echo "$CONFIG file not found. Exiting..."
  echo
  usage
  exit 1
fi

OWNER=$(owner $NAME)

# is it already running?
STATUS=$(is_it_running $NAME $OWNER)
if [ $STATUS -eq 1 ]; then
  echo "LXC container $NAME is already running. Exiting."
  exit 1
elif [ $STATUS -eq 2 ]; then
  echo "LXC container $NAME is frozen. Exiting."
  exit 1
fi

# start
sudo -u $OWNER lxc-start -n $NAME -f $CONFIG $OPTIONS
sudo -u $OWNER lxc-wait  -n $NAME -s RUNNING

exit 0