frontend.sh

#!/bin/sh

usage() {
  cat 1>&2 <<EOF
  usage: frontend.sh (command [args] | help)

Available commands:
  slave : Replication slave
  help : Prints this help message

For command-specific usage instructions, run frontend.sh command --help
EOF
}

process_args() {
  # Poor man's path expansion in argument 
  while [ $# -gt 0 ]; do
    if [ -e "$1" ]; then
      readlink -f "$1"
    else
      echo "$1"
    fi
    shift
  done
}


if [ $# -lt 2 ]; then
  usage
  exit 1
fi

if [ ! -e `pwd`/env ]; then
  echo "Please provide the environment variables file './env'" 1>&2
  exit 1
fi

. `pwd`/env

prog="$1"
shift

args=`process_args $@`

case "$prog" in
  help|--help|-h)
    usage
    exit 0
  ;;
  slave)
    cd db/slave
    ./slave.sh $args
  ;;
  master)
    cd db/master
    ./master.sh $args
  ;;
  *)
    usage
  ;;
esac