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  1. Jenkins
  2. JENKINS-60969

@libs pseudo-workspace collision due to branch name truncation


      I've spot an issue with unwanted interaction between different, independent jobs.

      Here are the details: Our Jenkins instance (2.176.1 LTS) has some global pipeline libraries configured. My task was some kind of structural migration on a bunch of different projects. So I created a corresponding branch on each of these projects, did the change there and pushed it. So all the build jobs started at the same time and surprisingly most of them failed with a strange error during initial jobs steps like this:

      remote: Compressing objects: 100% (6/6), done.        
      remote: Total 8 (delta 0), reused 0 (delta 0)        
      error: cannot lock ref 'refs/remotes/origin/bugfix/ESTA-3146-yla': Unable to create '/var/jenkins_home/workspace/rate-build-description-to-json_5@libs/pipeline-helper/.git/refs/remotes/origin/bugfix/ESTA-3146-yla.lock': File exists.
      Another git process seems to be running in this repository, e.g.

      After digging around I figured out, that the pipeline helper libs are cloned on the Jenkins master using a folder named like the job a/o branch, which is suffixed with `_<buildnumber>@libs`. Additionally the folder name is stripped to 37 characters by removing characters from the beginning of the name. This leads to the real cause: Because of the identical branch name on each Git repository, the unique part of the folder names got lost and so the jobs try to use the same folder during their initialization steps respectively the cloning of the pipeline helper libs. As soon as the simultaneous running jobs have a differnt build number, it works as expected.

      The branch was named "feature/KIHUB-7882-separate-build-description-to-json" on all modified projects respectively Git repositories and so at the master it looks like this right now:

      $ cd /var/jenkins_home/workspace
      $ ls -1

      So for me there are two questions and two possible solutions:
      1. Why is the folder name stripped?
      2. Why is the folder structure "flat" at this point and not like on the build jobs themself?

      I think there should be at least one folder level in between like this pseudo code example:


      Or the folder name itself should be unique:


            smasher Daniel Estermann
            swf Yves Schumann
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