Active choices reactive parameter doesn't show desired default branch - jenkins

Question

I want to use Jenkins' active choices reactive parameter to use Groovy script to show all branches in the repository.
I have the following code sample to get all branches of a repository and since that there are hundreds of branches, I want the default to be master branch.
Even though I specifically inserted the defaultBranch variable, it shows the first item as the default and not the branch I written to.
Code:
import com.cloudbees.plugins.credentials.CredentialsProvider;
import com.cloudbees.plugins.credentials.common.StandardUsernamePasswordCredentials;
import jenkins.model.Jenkins
def git_url ="url"
def getAllBranches(url, credentialID, activeChoice = false, defaultBranch = 'master') {
def jenkinsCredentials = CredentialsProvider.lookupCredentials(
com.cloudbees.jenkins.plugins.sshcredentials.impl.BasicSSHUserPrivateKey,
Jenkins.instance
);
def key = jenkinsCredentials.findResult { it.id == credentialID ? it.privateKey : null }
if( !key ) {
return 'Error: credentials not found'
}
Process process = ['ssh-agent','bash','-c', "echo '" + key + "' | ssh-add - 2> /dev/null && git ls-remote -t -h " + url].execute()
def out = new StringBuilder()
def err = new StringBuilder()
process.consumeProcessOutput( out, err )
process.waitFor()
if( err.size() > 0 ) return err
if( out.size() > 0 ) {
def branches = out.readLines().collect { it.split()[1].replaceAll('refs/heads/', '') }
if( activeChoice ) {
def defaultBranchIndex = branches.indexOf(defaultBranch)
if( defaultBranchIndex >= 0 ) branches.set(defaultBranchIndex, defaultBranch + ':selected')
}
return branches
}
}
return getAllBranches(git_url, "efa7bed9-56a0-42ac-8fa3-a68fe7700801")

Answer 1

You have set default for activeChoice to false in the getAllBranches method and do not set while calling it, thus the if-branch that adds the :selected is never entered.

Answer 2

I changed activeChoice method's value from false to true and it solved my issue:
import com.cloudbees.plugins.credentials.CredentialsProvider;
import com.cloudbees.plugins.credentials.common.StandardUsernamePasswordCredentials;
import jenkins.model.Jenkins
def git_url ="url"
def getAllBranches(url, credentialID, activeChoice = true, defaultBranch = 'master') {
def jenkinsCredentials = CredentialsProvider.lookupCredentials(
com.cloudbees.jenkins.plugins.sshcredentials.impl.BasicSSHUserPrivateKey,
Jenkins.instance
);
def key = jenkinsCredentials.findResult { it.id == credentialID ? it.privateKey : null }
if( !key ) {
return 'Error: credentials not found'
}
Process process = ['ssh-agent','bash','-c', "echo '" + key + "' | ssh-add - 2> /dev/null && git ls-remote -t -h " + url].execute()
def out = new StringBuilder()
def err = new StringBuilder()
process.consumeProcessOutput( out, err )
process.waitFor()
if( err.size() > 0 ) return err
if( out.size() > 0 ) {
def branches = out.readLines().collect { it.split()[1].replaceAll('refs/heads/', '') }
if( activeChoice ) {
def defaultBranchIndex = branches.indexOf(defaultBranch)
if( defaultBranchIndex >= 0 ) branches.set(defaultBranchIndex, defaultBranch + ':selected')
}
return branches
}
}
return getAllBranches(git_url, "efa7bed9-56a0-42ac-8fa3-a68fe7700801")