#!/bin/sh
#
# This is a wrapper that ensures that the agent is only installed _once_ automatically
# via cloud-init. Cloud-init 0.7.8 and earlier re-execute included URL's each boot.
# This script ensures that the agent is only ever installed once.

i_file=https://repos-droplet.digitalocean.com/install.sh
s_path="/var/lib/cloud/instance/sem"
s_file="${s_path}/dotty_agent"
download_timeout=20 # maximum allowed time for downloading the install script, in seconds

mkdir -p ${s_path}

test -f ${s_file} && exit 0

logger -t DOTTY-Agent "fetching and installing DOTTY agent"

if command -v wget &>/dev/null; then
  n=0
  until [ "$n" -ge 5 ]; do
    wget --timeout=${download_timeout} -O ${s_file} ${i_file} && break
    n=$((n + 1))
    sleep 2
  done
elif command -v curl &>/dev/null; then
  n=0
  until [ "$n" -ge 5 ]; do
    curl --max-time ${download_timeout} -SL --output ${s_file} ${i_file} && break
    n=$((n + 1))
    sleep 2
  done
else
  echo "Neither wget nor curl is supported"
  exit 1
fi

if [ ! -f ${s_file} ] || [ ! -s ${s_file} ]; then
  echo "failed to download DOTTY agent install script"
  exit 1
fi

chmod 0755 ${s_file}

if test -x ${s_file}; then
  exec ${s_file} || logger -t DOTTY-Agent "failed to install DOTTY agent"
fi