Add host-scripts/expose_ports.sh

Author: elgalu

host-scripts/expose_ports.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+
+# Exit immediately if a command exits with a non-zero status
+set -e
+
+# echo fn that outputs to stderr http://stackoverflow.com/a/2990533/511069
+echoerr() {
+  cat <<< "$@" 1>&2;
+}
+
+# print error and exit
+die () {
+  echoerr "ERROR: $1"
+  # if $2 is defined AND NOT EMPTY, use $2; otherwise, set to "3"
+  errnum=${2-3}
+  exit $errnum
+}
+
+# Required params
+[ -z "${1}" ] && die "Need at least 1 port number argument!"
+MYAPP_PORTS=$@
+
+[ -z "${SSH_HOME}" ] && die "Need environment variable \$SSH_HOME set!"
+[ -z "${CONTAINER_IP}" ] && die "Need environment variable \$CONTAINER_IP set!"
+[ -z "${SSHD_PORT}" ] && die "Need environment variable \$SSHD_PORT set!"
+BASE_SSH_CMD="-p ${SSHD_PORT} -o StrictHostKeyChecking=no -N -fn application@${CONTAINER_IP}"
+
+## convert space separated string into a bash array
+IFS=' ' read -a MYAPP_PORTS <<< "${MYAPP_PORTS}"
+declare -a MYAPP_PORTS=${MYAPP_PORTS}
+
+# to setup tunnels first kill existing tunnels if any
+# then set them up in the background
+for i in "${MYAPP_PORTS[@]}"; do
+  kill $(lsof -i tcp:${i} -F p | cut -b 2-) >/dev/null 2>&1 || true
+  ssh-keygen -f "${SSH_HOME}/.ssh/known_hosts" -R [${CONTAINER_IP}]:${SSHD_PORT} >/dev/null 2>&1 || true
+  ssh ${BASE_SSH_CMD} -R localhost:${i}:localhost:${i} &
+done