Jenkins管道检索Git分支和哈希

Question

I am trying to retrieve the git branch and hash in the Jenkins pipeline but for some strange reason, the stdout for branch in particular always comes back as 'HEAD'. If I run the exact command in bash it works just fine. I get 'develop' and the hash.

Pipeline

stage('Build') {
    script {
        GIT_BRANCH = sh(returnStdout: true, script: "git rev-parse --abbrev-ref HEAD").trim()
        GIT_HASH = sh(returnStdout: true, script: "git rev-parse --short HEAD").trim()
    }
    echo "branch is: ${GIT_BRANCH}"
    echo "hash is: ${GIT_HASH}"
}

Output

Running shell script
+ git rev-parse --abbrev-ref HEAD
Running shell script
+ git rev-parse --short HEAD
branch is: HEAD
hash is: dd96820

Answer 1

That seems related to issue JENKINS-45962 : " GIT_BRANCH variable is not populated in jenkins pipeline"

It refers to JENKINS-26100 , which allows SCM steps to return the revision state (not the branch).

Hence the comment:

I don't plan to change this, since JENKINS-26100 allows the checkout step (and the git step) to return a map of names and values from the checkout.

Pipelines can (and often do) use multiple checkout steps, and it is cleaner, safer, and more understandable to store the returned values for a specific checkout in a map than it is to read environment variables and decide which checkout provided which environment variables.

Since there are multiple checkout step, one environment variable (like GIT_BRANCH ) is no longer populated.
Since HEAD is always detached, ... rev-parse would always return a commit, not a branch name.