when try to use docker.image(), it will find the container id first. However, the current method getContainerIdIfContainerized() can not parse the container id because the return message of /proc/1/moutninfo is different. Please refer to the following.

cat /proc/1/mountinfo | grep /hostname

1339 1333 0:48 /containers/overlay-containers/4c4d5c5475f78f2b8a98e2894adcc3152ac587ac3c406a5c4eb74cc3f129c03c/userdata/hostname /etc/hostname rw,nosuid,nodev,relatime - tmpfs tmpfs rw,seclabel,size=1609596k,mode=700,uid=1001,gid=1001

 

Reproduction steps

1. run a docker container in a podman container, on REHL8.


2. go to the docker conainer


3. run command: cat /proc/1/mountinfo | grep /hostname


4. check the string which contains the contianer id.

Expected Results

the current code uses regexp "/containers/([a-z0-9]{64})/hostname" to parse the container id, so it expects /containers/[id]/hostname.

Actual Results

1339 1333 0:48 /containers/overlay-containers/4c4d5c5475f78f2b8a98e2894adcc3152ac587ac3c406a5c4eb74cc3f129c03c/userdata/hostname /etc/hostname rw,nosuid,nodev,relatime - tmpfs tmpfs rw,seclabel,size=1609596k,mode=700,uid=1001,gid=1001

---
Originally reported by westmount, imported from: can not get container id if the Jenkins is running in a podman

• assignee: naveenboni
  
• status: Open
  
• priority: Blocker
  
• component(s): docker-workflow-plugin
  
• resolution: Unresolved
  
• votes: 0
  
• watchers: 5
  
• imported: 2025-12-07
  

Raw content of original issue

when try to use docker.image(), it will find the container id first. However, the current method getContainerIdIfContainerized() can not parse the container id because the return message of /proc/1/moutninfo is different. Please refer to the following.

cat /proc/1/mountinfo | grep /hostname


1339 1333 0:48 /containers/overlay-containers/4c4d5c5475f78f2b8a98e2894adcc3152ac587ac3c406a5c4eb74cc3f129c03c/userdata/hostname /etc/hostname rw,nosuid,nodev,relatime - tmpfs tmpfs rw,seclabel,size=1609596k,mode=700,uid=1001,gid=1001


 

Reproduction steps



	
run a docker container in a podman container, on REHL8.

	
go to the docker conainer

	
run command: cat /proc/1/mountinfo | grep /hostname

	
check the string which contains the contianer id.



Expected Results


the current code uses regexp "/containers/([a-z0-9]{64})/hostname" to parse the container id, so it expects /containers/[id]/hostname.

Actual Results


1339 1333 0:48 /containers/overlay-containers/4c4d5c5475f78f2b8a98e2894adcc3152ac587ac3c406a5c4eb74cc3f129c03c/userdata/hostname /etc/hostname rw,nosuid,nodev,relatime - tmpfs tmpfs rw,seclabel,size=1609596k,mode=700,uid=1001,gid=1001

environment

```
REHL8,

 Jenkins running in podman on REHL8, docker installed in Jenkins image
```