CF app blue/green deployment from Jenkins

jenkins-blue-green-cf-push.sh

# Given an app with mirrors web-blue and web-green in the CF test space with hostname www.example.org...

# Find which mirror is already active, which to switch to
export OLD_MIRROR=$(cf routes | sed -nr 's/^(test\s+)?www\s+example\.org\s+web-(blue|green).*$/\2/p')
if [ "$OLD_MIRROR" = "blue" ]; then
  export NEW_MIRROR="green"
elif [ "$OLD_MIRROR" = "green" ]; then
  export NEW_MIRROR="blue"
else
  export OLD_MIRROR="green"
  export NEW_MIRROR="blue"
fi

## Push to Cloud Foundry
cf push web-${NEW_MIRROR} --no-route

## Switch route targets
cf map-route web-${NEW_MIRROR} example.org -n www
cf unmap-route web-${OLD_MIRROR} example.org -n www

## Stop old mirror
cf stop web-${OLD_MIRROR}