Jenkinsfile 为了将提交分支的名称隔离到可以在日志中打印出的变量中，需要对以下内容进行哪些具体更改？
在以下情况下，分支的名称为GWS-43-getissueforcommit。

具体细节如下：

Jenkinsfile：

以下代码Jenkinsfile在通过运行checkout(scm).GIT_ASKPASS命令产生的输出中间打印出分支名称，但是当后续代码行（sh "echo 'The repo Ask Pass is: ${repoAskPass}'"）尝试打印命令的封装结果时，此信息会丢失：

node {
    // Clean workspace before doing anything
    deleteDir()
    try {
        stage ('Clone') {
            def repoAskPass = checkout(scm).GIT_ASKPASS
            sh "echo 'The repo Ask Pass is: ${repoAskPass}'"
        }
    } catch (err) {
        currentBuild.result = 'FAILED'
        throw err
    }
}

结果日志：

结果日志输出为：

General SCM<1s
    Cloning the remote Git repository
    Cloning with configured refspecs honoured and without tags
    Cloning repository http://<bitbucket-ip-on-lan>:7990/scm/JSP/jenkinsfile-simple-repo.git
     > git init /var/jenkins_home/workspace/ne_GWS-43-getissueforcommit-M2X23QGNMETLDZWFK7IXVZQRCNSWYNTDFJZU54VP7DMIOD6Z4DGA # timeout=10
    Fetching upstream changes from http://<bitbucket-ip-on-lan>:7990/scm/JSP/jenkinsfile-simple-repo.git
     > git --version # timeout=10
    using GIT_ASKPASS to set credentials Bitbucket server credentials
     > git fetch --no-tags --progress http://<bitbucket-ip-on-lan>:7990/scm/JSP/jenkinsfile-simple-repo.git +refs/heads/GWS-43-getissueforcommit:refs/remotes/origin/GWS-43-getissueforcommit
     > git config remote.origin.url http://<bitbucket-ip-on-lan>:7990/scm/JSP/jenkinsfile-simple-repo.git # timeout=10
     > git config --add remote.origin.fetch +refs/heads/GWS-43-getissueforcommit:refs/remotes/origin/GWS-43-getissueforcommit # timeout=10
     > git config remote.origin.url http://<bitbucket-ip-on-lan>:7990/scm/JSP/jenkinsfile-simple-repo.git # timeout=10
    Cleaning workspace
     > git rev-parse --verify HEAD # timeout=10
    No valid HEAD. Skipping the resetting
     > git clean -fdx # timeout=10
    Fetching without tags
    Fetching upstream changes from http://<bitbucket-ip-on-lan>:7990/scm/JSP/jenkinsfile-simple-repo.git
    using GIT_ASKPASS to set credentials Bitbucket server credentials
     > git fetch --no-tags --progress http://<bitbucket-ip-on-lan>:7990/scm/JSP/jenkinsfile-simple-repo.git +refs/heads/GWS-43-getissueforcommit:refs/remotes/origin/GWS-43-getissueforcommit
    Checking out Revision 375b17c4e7453d802d94659836db436553cc7f0c (GWS-43-getissueforcommit)
     > git config core.sparsecheckout # timeout=10
     > git checkout -f 375b17c4e7453d802d94659836db436553cc7f0c
     > git branch -a -v --no-abbrev # timeout=10
     > git checkout -b GWS-43-getissueforcommit 375b17c4e7453d802d94659836db436553cc7f0c
    Commit message: "isolate ASKPASS"
     > git rev-list --no-walk 268c468a96de0fb27b6f205658a169b38871b581 # timeout=10
    Cleaning workspace
     > git rev-parse --verify HEAD # timeout=10
    Resetting working tree
     > git reset --hard # timeout=10
     > git clean -fdx # timeout=10
    [Bitbucket] Notifying commit build result

echo 'The repo Ask Pass is: null'— Shell Script<1s
    [ne_GWS-43-getissueforcommit-M2X23QGNMETLDZWFK7IXVZQRCNSWYNTDFJZU54VP7DMIOD6Z4DGA] Running shell script
    + echo The repo Ask Pass is: null
    The repo Ask Pass is: null

重述的问题：

为了在日志中输出以下行，需要如何修改上述Jenkinsfile：

The name of the branch containing the commit for this build is: 
GWS-43-getissueforcommit