travis_after_deploy.sh

#!/bin/bash

set -e -o pipefail

if [ "${TRAVIS_BRANCH}" == "master" ]; then
  TARGET_APP_NAME="turtle-api"

  echo "Backing up the database (if a migration is needed)"
  heroku run "mix db.backup_before_migration" --app "${TARGET_APP_NAME}"

  echo "Running migrations (if there are any)..."
  heroku run "mix ecto.migrate" --app "${TARGET_APP_NAME}"

  echo "Rebuilding subscribers (if needed)"
  heroku run "mix es.rebuild_subscribers" --app "${TARGET_APP_NAME}"

  echo "Setting maintenance mode 'off' on heroku's app"
  heroku maintenance:off --app "${TARGET_APP_NAME}"

  echo "Application ready again. YAY!"
fi

travis_before_deploy.sh

#!/bin/bash

set -e -o pipefail

if [ "${TRAVIS_BRANCH}" == "master" ]; then

  TARGET_APP_NAME="turtle-api"

  echo "Setting up '~/.ssh/config' to work with heroku."
  cat >> ~/.ssh/config <<EOF
   Host heroku.com
   StrictHostKeyChecking no
   CheckHostIP no
   UserKnownHostsFile=/dev/null
EOF

  # DOC: https://devcenter.heroku.com/articles/authentication#usage-examples
  cat >> ~/.netrc <<EOF
machine api.heroku.com
  login ${HEROKU_API_LOGIN}
  password ${HEROKU_API_KEY}
EOF
  chmod 600 ~/.netrc

  echo "Installing heroku toolbelt"
  wget -qO- https://toolbelt.heroku.com/install-ubuntu.sh | sh

  echo "Setting maintenance mode 'on' on heroku's app"
  heroku maintenance:on --app "${TARGET_APP_NAME}"
fi