Env Variable Page Decoration

https://wiki.jenkins.io/display/JENKINS/Environment+Variable+Page+Decoration+Plugin

Pretty much what it says on the tin. Use API exposed by PageDecorator to inject environent variables into Jenkins Pages. Primarily useful for adding deploy data to the footer.

This is targetted at systems that are deployed via some automated means, there is no UI for configuration.

You can set the following environment variables:

• JENKINS_FOOTER_EXTRA - Add content to the footer after the Jenkins version content.
• JENKINS_FOOTER_EXTRA_B64 - If this is set, then JENKINS_FOOTER_EXTRA is base64 decoded.
• JENKINS_HEADER_EXTRA - Add content in the page head tags (e.g., css or javascript tags).
• JENKINS_HEADER_EXTRA_B64 - If this is set, then JENKINS_HEADER_EXTRA is base64 decoded.

This would be handled by your deploy tooling, but for the sake of a walkthrough (and something you can run locally with docker) you can set some environment variables:

export DEPLOY_TIME=$(date)
export DEPLOY_USER=${USER}
export GIT_BRANCH=$(git branch | grep \* | cut -d ' ' -f2)
export GIT_SHA=$(git rev-parse --short HEAD)

Create a footer template to consume the environment variables (data.sh):

echo "<span style='margin-left: 1em;'>deployed ${GIT_BRANCH}@${GIT_SHA} by ${DEPLOY_USER} at ${DEPLOY_TIME}</span>"

Create a base64 encoded string:

bash data.sh | base64 | pbcopy

Set the environment variables when running Jenkins (e.g., via Docker):

-e JENKINS_FOOTER_EXTRA="PHNwYW4gc3R5bGU9J21hcmdpbi1sZWZ0OiAxZW07Jz5kZXBsb3llZCBldnBkLXRlc3RAYWJjMTIzIGJ5IHR2b24gYXQgVGh1IE1heSAgMiAyMjozNzo1OSBFRFQgMjAxOTwvc3Bhbj4K" -e JENKINS_FOOTER_EXTRA_B64=1