詹金斯和Git的麻煩

Question

現在我試圖用Git插件從bitbucket中提取一個存儲庫，並在jenkins中構建它。但是，每當我這樣做，我得到：

FATAL: Could not checkout null with start point <Starting Point> 
hudson.plugins.git.GitException: Could not checkout null with start point <Starting Point> 
    at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.checkoutBranch(CliGitAPIImpl.java:894) 
at hudson.plugins.git.GitSCM$4.invoke(GitSCM.java:1229) 
at hudson.plugins.git.GitSCM$4.invoke(GitSCM.java:1205) 
at hudson.FilePath.act(FilePath.java:906) 
at hudson.FilePath.act(FilePath.java:879) 
at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1205) 
at hudson.model.AbstractProject.checkout(AbstractProject.java:1394) 
at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:676) 
at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:88) 
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:581) 
at hudson.model.Run.execute(Run.java:1593) 
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46) 
at hudson.model.ResourceController.execute(ResourceController.java:88) 
at hudson.model.Executor.run(Executor.java:247) 
Caused by: hudson.plugins.git.GitException: Command "git checkout -f <Starting Point>" returned status code 1: 
stdout: 
stderr: error: unable to unlink old <File> (Permission denied) 
error: unable to unlink old <File> (Permission denied) 
error: unable to unlink old <File> (Permission denied) 
error: unable to unlink old <File> (Permission denied) 
error: unable to create file <File> (Permission denied) 
error: unable to unlink old <File> (Permission denied) 

我已經試過手動刪除下的非詹金斯用戶OSX的文件，它的工作原理，但隨後將無法創建文件。

編輯：我實際上通過添加一個「執行shell命令」步驟，並插入「Git拉」，而不是使用Git插件來解決問題。

Answer 1

起點參數需要被定義

試試這個：

git checkout -f HEAD