Jenkins substring environment variable

Question

I'm using Jenkins and the Git plugin which offers the following environment variables:

• GIT_COMMIT: SHA of the current
• GIT_BRANCH: Name of the branch currently being used, eg "master" or "origin/foo"
• GIT_PREVIOUS_COMMIT: SHA of the previous built commit from the same branch (the current SHA on first build in branch)
• GIT_URL: Repository remote URL
• GIT_URL_N: Repository remote URLs when there are more than 1 remotes, eg GIT_URL_1, GIT_URL_2
• GIT_AUTHOR_EMAIL: Committer/Author Email
• GIT_COMMITTER_EMAIL: Committer/Author Email

Using the Version Number Plugin , I've got a ${GIT_COMMIT} variable which is read as expected.

The problem is, it's the full 32 (?) character SHA hash. I'd like to take a substring of it. Is there a way to take a substring of an environment variable in Jenkins?

Answer 1

In bash (I assume that's what you want to know since you tagged the question with it), you can do it by using this syntax: ${string:start_position:length}

You could extract eg the first 8 characters of the hash by writing:

${GIT_COMMIT:0:8}

I've taken this solution from here: http://tldp.org/LDP/abs/html/string-manipulation.htm