mesos-init-wrapper

#!/bin/bash
set -o errexit -o nounset -o pipefail
function -h {
cat <<USAGE
 USAGE: mesos-init-wrapper (master|slave)

  Run Mesos in master or slave mode, loading environment files, setting up
  logging and loading config parameters as appropriate.

USAGE
}; function --help { -h ;}                 # A nice way to handle -h and --help
export LC_ALL=en_US.UTF-8                    # A locale that works consistently

function main {
  err "Please use \`master' or \`slave'."
}

function slave {
  local args=()
  [[ ! -f /etc/default/mesos ]]       || . /etc/default/mesos
  [[ ! -f /etc/default/mesos-slave ]] || . /etc/default/mesos-slave
  [[ ! ${ULIMIT:-} ]]    || ulimit $ULIMIT
  [[ ! ${MASTER:-} ]]    || args+=( --master="$MASTER" )
  [[ ! ${LOGS:-} ]]      || args+=( --log_dir="$LOGS" )
  [[ ! ${ISOLATION:-} ]] || args+=( --isolation="$ISOLATION" )
  logged /usr/local/sbin/mesos-slave "${args[@]}"
}

function master {
  local args=()
  [[ ! -f /etc/default/mesos ]]        || . /etc/default/mesos
  [[ ! -f /etc/default/mesos-master ]] || . /etc/default/mesos-master
  [[ ! ${ULIMIT:-} ]]  || ulimit $ULIMIT
  [[ ! ${ZK:-} ]]      || args+=( --zk="$ZK" )
  [[ ! ${PORT:-} ]]    || args+=( --port="$PORT" )
  [[ ! ${CLUSTER:-} ]] || args+=( --cluster="$CLUSTER" )
  [[ ! ${LOGS:-} ]]    || args+=( --log_dir="$LOGS" )
  logged /usr/local/sbin/mesos-master "${args[@]}"
}

# Send all output to syslog and tag with PID and executable basename.
function logged {
  local tag="${1##*/}[$$]"
  exec 1> >(exec logger -p user.info -t "$tag")
  exec 2> >(exec logger -p user.err  -t "$tag")
  exec "$@"
}

function msg { out "$*" >&2 ;}
function err { local x=$? ; msg "$*" ; return $(( $x == 0 ? 1 : $x )) ;}
function out { printf '%s\n' "$*" ;}

if [[ ${1:-} ]] && declare -F | cut -d' ' -f3 | fgrep -qx -- "${1:-}"
then "$@"
else main "$@"
fi