Sync a directory into a CoreOS node using the unison container

coreos-sync.sh

#!/bin/sh

# add `export COREOS_DOCKER_HOST_IP=some-ip-address` to your .bashrc or .zshrc

function echo_usage_and_exit()
{
  echo "Usage: coreos-sync local_path_to_sync remote_dir_to_sync_into [options]"
  echo "Options:"
  echo "\t-w\t\t(watches/resyncs on changes)"
  echo "\t-v\t\t(enable verbose mode)"
  echo "\t-h hostname\t(ip or hostname of CoreOS host)"
  echo "\t-p port\t\t(port of CoreOS host; default: 5000)"
  echo "\t-- arg [arg...]\t(args to pass to unison)"
  exit
}

function echo_set_coreos_docker_host_ip_and_exit()
{
  echo "Error: COREOS_DOCKER_HOST_IP not set"
  echo "Either set COREOS_DOCKER_HOST_IP or use -h hostname"
  exit
}

function get_opts()
{
  if [ -n "$1" ]; then
    case "$1" in
      "-w")
        watch="true"
        ;;
      "-v")
        verbose="true"
        ;;
      "-h")
        if [ -n "$2" ]; then
          hostname=$2
          shift
        else
          echo_usage_and_exit
        fi
        ;;
      "-p")
        if [ -n "$2" ]; then
          port=$2
          shift
        else
          echo_usage_and_exit
        fi
        ;;
      "--")
        shift # shift away the '--' arg
        unisonargs=$@ # assign all the rest of the args to unisonargs
        shift $# # shift all the args that are left
        ;;
      *)
        echo_usage_and_exit
        ;;
    esac
    [ -n "$unisonargs" ] || shift # shift the arg, unless $unisonargs is set
    get_opts $@
  fi
}

[ -n "$1" ] && localdir=$1 && [ -n "$2" ] && remotedir=$2 && shift && shift || echo_usage_and_exit

[ -n "$COREOS_DOCKER_HOST_IP" ] && hostname=$COREOS_DOCKER_HOST_IP

port=5000

get_opts $@

[ -n "$unisonargs" ] || unisonargs=""

[ -n "$hostname" ] || echo_set_coreos_docker_host_ip_and_exit

[ -n "$verbose" ] && terseness="false" || terseness="true"

prog="unison $localdir socket://$hostname:$port/$remotedir -auto -batch -terse=$terseness -times -nodeletion=$localdir $unisonargs"

$prog && [ -n "$watch" ] && fswatch -o $localdir | xargs -n1 -I{} $prog