kubernetes jenkins pipeline优化拉取大仓库性能指定分支+深度

有时候我们历史的git仓库，提交了某个比较大的文件如果不限制 depth ，就会拉取所有的历史提交记录，这样在历史仓库比较大的时候 clone 非常之慢，而实际上我们只需要最新的代码来构建就行了，为了优化性能，我们可以配置指定拉取：

关键配置：

        stage('Check code') {
            echo("gitCommitId value is: ${gitCommitId}")
            // sh "sleep 10000"
            def scmVars = checkout([
                    $class: 'GitSCM',
                    branches: [[name: "${gitCommitId}"]],
                    extensions: [
                            [$class: 'CloneOption', depth: 1, shallow: true, noTags: true, honorRefspec: true, timeout: 3000]
                    ],
                    userRemoteConfigs: [[
                                                credentialsId: "${gitlabCredential}",
                                                url: "${gitlabURL}",
                                                refspec: "+refs/heads/${gitCommitId}:refs/remotes/origin/${gitCommitId}"
                                        ]]
            ])
            commitHash = scmVars.GIT_COMMIT.take(8)
            echo("${commitHash}")
        }

上面的拉取方式只适合拉取分支的，如果还要兼容commitId，需要下面的配置：

// 判断是分支名还是 commit hash
def isCommitHash = gitCommitId ==~ /^[a-f0-9]{7,40}$/

def scmVars = checkout([
    $class: 'GitSCM',
    branches: [[name: isCommitHash ? "${gitCommitId}" : "origin/${gitCommitId}"]],
    extensions: [
        [$class: 'CloneOption', depth: 1, shallow: true, noTags: true, honorRefspec: true, timeout: 3000]
    ],
    userRemoteConfigs: [[
        credentialsId: "${gitlabCredential}",
        url: "${gitlabURL}",
        refspec: isCommitHash ? 
            "+${gitCommitId}:refs/remotes/origin/target-commit" : 
            "+refs/heads/${gitCommitId}:refs/remotes/origin/${gitCommitId}"
    ]]
])