[JENKINS-71487] GitLab branch source should not show stack trace on heavyweight checkout

A multibranch Pipeline that I created with the GitLab branch source reported an unexpected stack trace in the log of the merge request job that was being built.

The stack trace was:

```
14:59:18 Branch indexing
14:59:18 Querying the current revision of branch master...
14:59:18 Current revision of branch master is 67378b9650cd2d539f6b869a20cbc29a0d268406
14:59:19 ERROR: Could not do lightweight checkout, falling back to heavyweight
14:59:19 java.io.IOException: Jenkinsfile not found at 67378b9650cd2d539f6b869a20cbc29a0d268406
14:59:19 at io.jenkins.plugins.gitlabbranchsource.GitLabSCMFile.fetchFile(GitLabSCMFile.java:127)
14:59:19 at io.jenkins.plugins.gitlabbranchsource.GitLabSCMFile.content(GitLabSCMFile.java:119)
14:59:19 at jenkins.scm.api.SCMFile.contentAsString(SCMFile.java:335)
14:59:19 at org.jenkinsci.plugins.workflow.multibranch.SCMBinder.create(SCMBinder.java:108)
14:59:19 at org.jenkinsci.plugins.workflow.job.WorkflowRun.run(WorkflowRun.java:312)
14:59:19 at hudson.model.ResourceController.execute(ResourceController.java:101)
14:59:19 at hudson.model.Executor.run(Executor.java:442)
14:59:19 Checking out git https://gitlab.com/MarkEWaite/hugo-experiment.git

```

There is a Jenkinsfile in commit 67378b9650cd2d539f6b869a20cbc29a0d268406. It was surprising that the branch source plugin could not do a lightweight checkout, since the merge request source branch has a Jenkinsfile and the merge request destination branch has the same Jenkinsfile.

---
Originally reported by markewaite, imported from: GitLab branch source should not show stack trace on heavyweight checkout

• status: Open
  
• priority: Minor
  
• component(s): gitlab-branch-source-plugin
  
• resolution: Unresolved
  
• votes: 0
  
• watchers: 1
  
• imported: 20251216-182730
  

Raw content of original issue

A multibranch Pipeline that I created with the GitLab branch source reported an unexpected stack trace in the log of the merge request job that was being built.


The stack trace was:




14:59:18  Branch indexing

14:59:18  Querying the current revision of branch master...

14:59:18  Current revision of branch master is 67378b9650cd2d539f6b869a20cbc29a0d268406

14:59:19  ERROR: Could not do lightweight checkout, falling back to heavyweight

14:59:19  java.io.IOException: Jenkinsfile not found at 67378b9650cd2d539f6b869a20cbc29a0d268406

14:59:19  	at io.jenkins.plugins.gitlabbranchsource.GitLabSCMFile.fetchFile(GitLabSCMFile.java:127)

14:59:19  	at io.jenkins.plugins.gitlabbranchsource.GitLabSCMFile.content(GitLabSCMFile.java:119)

14:59:19  	at jenkins.scm.api.SCMFile.contentAsString(SCMFile.java:335)

14:59:19  	at org.jenkinsci.plugins.workflow.multibranch.SCMBinder.create(SCMBinder.java:108)

14:59:19  	at org.jenkinsci.plugins.workflow.job.WorkflowRun.run(WorkflowRun.java:312)

14:59:19  	at hudson.model.ResourceController.execute(ResourceController.java:101)

14:59:19  	at hudson.model.Executor.run(Executor.java:442)

14:59:19  Checking out git https://gitlab.com/MarkEWaite/hugo-experiment.git





There is a Jenkinsfile in commit 67378b9650cd2d539f6b869a20cbc29a0d268406.  It was surprising that the branch source plugin could not do a lightweight checkout, since the merge request source branch has a Jenkinsfile and the merge request destination branch has the same Jenkinsfile.

environment

```
Jenkins 2.401.1

GitLab branch source plugin 664.v877fdc293c89

Other plugins as recorded in plugins.txt

https://github.com/MarkEWaite/docker-lfs/blob/7e0d7afda4d9b4dd8ebdf0a6322ee481f22631f2/plugins.txt#L61
```