Is it impossible to checkout a different branch in Jenkinsfile?

user_6737860 0
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I have two branches on BitBucket: master and develop. I've also got a BitBucket Team Folder job configured on my Jenkins server to build that repository. On the develop branch there's the following Jenkinsfile:

node {
    stage('Checkout') {
        checkout scm
    }

    stage('Try different branch') {
        sh "git branch -r"
        sh "git checkout master"
    }
}

When Jenkins runs it, the build fails when it attempts to checkout master:

[Pipeline] stage
[Pipeline] { (Try different branch)
[Pipeline] sh
[e_jenkinsfile-tests_develop-4R65E2H6B73J3LB52BLACQOZLBJGN2QG22IPONX3CV46B764LAXA] Running shell script
+ git branch -r
  origin/develop
[Pipeline] sh
[e_jenkinsfile-tests_develop-4R65E2H6B73J3LB52BLACQOZLBJGN2QG22IPONX3CV46B764LAXA] Running shell script
+ git checkout master
error: pathspec 'master' did not match any file(s) known to git.
[Pipeline] }

I had expected the git branch -r command to print out both origin/master and origin/develop, but for some reason it only prints the latter.

I've read around and tried to come up with any ways to do this: For example, I tried installing the SSH Agent Plugin for Jenkins and changed the Jenkinsfile to:

node {
    stage('Checkout') {
        checkout scm
    }

    stage('Try different branch') {
        sshagent(['Bitbucket']) {
            sh "git branch -r"
            sh "git checkout master"
        }
    }
}

But it still doesn't appear to find origin/master. What's worse, the SSH agent seems to be killed before it attempts to checkout master:

[Pipeline] { (Try different branch)
[Pipeline] sshagent
[ssh-agent] Using credentials ThomasKasene (Used to communicate with Bitbucket)
[ssh-agent] Looking for ssh-agent implementation...
[ssh-agent]   Exec ssh-agent (binary ssh-agent on a remote machine)
$ ssh-agent
SSH_AUTH_SOCK=/tmp/ssh-M6pIguCUpAV4/agent.11899
SSH_AGENT_PID=11902
$ ssh-add /var/jenkins_home/workspace/e_jenkinsfile-tests_develop-4R65E2H6B73J3LB52BLACQOZLBJGN2QG22IPONX3CV46B764LAXA@tmp/private_key_2394129657382526146.key
Identity added: /var/jenkins_home/workspace/e_jenkinsfile-tests_develop-4R65E2H6B73J3LB52BLACQOZLBJGN2QG22IPONX3CV46B764LAXA@tmp/private_key_2394129657382526146.key (/var/jenkins_home/workspace/e_jenkinsfile-tests_develop-4R65E2H6B73J3LB52BLACQOZLBJGN2QG22IPONX3CV46B764LAXA@tmp/private_key_2394129657382526146.key)
[ssh-agent] Started.
[Pipeline] {
[Pipeline] sh
[e_jenkinsfile-tests_develop-4R65E2H6B73J3LB52BLACQOZLBJGN2QG22IPONX3CV46B764LAXA] Running shell script
+ git branch -r
  origin/develop
[Pipeline] sh
$ ssh-agent -k
unset SSH_AUTH_SOCK;
unset SSH_AGENT_PID;
echo Agent pid 11902 killed;
[ssh-agent] Stopped.
[e_jenkinsfile-tests_develop-4R65E2H6B73J3LB52BLACQOZLBJGN2QG22IPONX3CV46B764LAXA] Running shell script
+ git checkout master
error: pathspec 'master' did not match any file(s) known to git.
[Pipeline] }

My eventual plan is to commit something to develop and then merge it into master, but so far I have had very little luck. Has anybody got a possible solution or workaround?

PS: This only seems to be a problem in Jenkinsfile; I have a freestyle job that does something similar to what I want, and it works fine.

jenkins-pipeline bitbucket jenkins git
5 Answers

The problem is that Jenkins is defining the origin with only the branch that is discovered.

@swoop81 answer is working but if you just want to checkout one branch, you could fetch only this one.

git config --add remote.origin.fetch +refs/heads/<branch-name>:refs/remotes/origin/<branch-name>
git fetch --no-tags https://<github-url> +refs/heads/<branch-name>:refs/remotes/origin/<branch-name>
user_10939250

You can use the git command which is the less advanced version of the checkout command

stage('Repo Checkout') {
            steps {
                deleteDir()
                dir("repo-one-master") {
                    git url: "ssh://git@host.com/folder/project",
                        branch: 'master'
                }
                dir("repo-one-feature) {
                    git url: "ssh://git@host.com/folder/project",
                        branch: 'some-branch'
                }
            }
        }
user_17086970
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