start.sh

#!/bin/bash

jenkins_master_is_up() {
  status=$(curl -s -o /dev/null -w "%{http_code}" $1)
  if [[ "$status" -eq 200 ]]; then
    return 0
  else
    return 1
  fi
}

autoconnect() {
  JENKINS_URL=$1
  MAX_TRIES=10
  connect_counter=0

  echo "Trying to connect to master on $JENKINS_URL"

  while ! jenkins_master_is_up $JENKINS_URL && [[ $connect_counter -lt $MAX_TRIES ]]; do
    ((connect_counter++))
    echo "Attempt $connect_counter"
    sleep 3
  done

  if [[ $connect_counter -eq $MAX_TRIES ]]; then
    echo "Failed after $MAX_TRIES attempts to connect to the Jenkins master."
    echo "Slave won't attempt to automatically connect again."
  fi
}

if [[ -z $JENKINS_SERVICE_HOST || -z $JENKINS_SERVICE_PORT ]]; then
  echo "JENKINS_SERVICE_HOST or JENKINS_SERVICE_PORT not set."
  echo "Script won't attempt to autoconnect to Jenkins master."
else
  JENKINS_URL="http://$JENKINS_SERVICE_HOST:$JENKINS_SERVICE_PORT"
  echo "Trying to auto connect to Jenkins master on $JENKINS_URL"
  autoconnect $JENKINS_URL
fi

/usr/sbin/sshd -D