[JENKINS-67659] Jenkins reports that a Dockerized agent on macOS "does not seem to be running inside a container" when it is in fact running inside a container

I have an inbound agent running on macOS. Its Dockerfile is as follows. 

FROM jenkins/inbound-agent

 

COPY --from=docker /usr/local/bin/docker /usr/local/bin/

USER root

RUN mkdir /usr/local/.docker/

USER jenkins

 When using withDockerContainer, Jenkins says it "does not seem to be running inside a container". This is not true, and it causes volume mounts to fail.

java.io.IOException: Failed to run image ''. Error: docker: Error response from daemon: Mounts denied: The paths /home/jenkins/agent/workspace/@​tmp and /home/jenkins/agent/workspace/ are not shared from OS X and are not known to Docker. You can configure shared paths from Docker -> Preferences... -> File Sharing. See https://docs.docker.com/docker-for-mac/osxfs/#namespaces for more info.

I believe the issue stems from this code being incorrect. 

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Originally reported by zmarffy, imported from: Jenkins reports that a Dockerized agent on macOS "does not seem to be running inside a container" when it is in fact running inside a container

• status: Open
  
• priority: Minor
  
• component(s): docker-workflow-plugin
  
• label(s): docker, docker-workflow-plugin, plugin
  
• resolution: Unresolved
  
• votes: 0
  
• watchers: 1
  
• imported: 2025-12-07
  

Raw content of original issue

I have an inbound agent running on macOS. Its Dockerfile is as follows. 



FROM jenkins/inbound-agent

 

COPY --from=docker /usr/local/bin/docker /usr/local/bin/

USER root

RUN mkdir /usr/local/.docker/

USER jenkins





 When using withDockerContainer, Jenkins says it "does not seem to be running inside a container". This is not true, and it causes volume mounts to fail.



java.io.IOException: Failed to run image '<image id>'. Error: docker: Error response from daemon: Mounts denied: The paths /home/jenkins/agent/workspace/<job name>@tmp and /home/jenkins/agent/workspace/<job name> are not shared from OS X and are not known to Docker. You can configure shared paths from Docker -> Preferences... -> File Sharing. See https://docs.docker.com/docker-for-mac/osxfs/#namespaces for more info.





I believe the issue stems from this code being incorrect. 

• environment: Jenkins 2.330, Dockerized agent on macOS