Mkdir /.docker: permission denied error when trying to build docker image from Jenkins pipeline on Mac

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1

Hi, I’m running Jenkins for MacOS (using Homebrew) and Docker Desktop on Mac.
When I try to build docker image for Python app from Jenkins pipeline, the following error is reported:

+ docker build -t <docker image name> .
ERROR: mkdir /.docker: permission denied

Jenkinsfile snippet:

pipeline {
    agent none
    stages {
        ...
            stage("Build Docker Image") {
            agent {
                docker { image 'docker:24.0.5' }
            }
            steps {
               script {
                dockerImage = docker.build("<docker image name>:${env.BUILD_ID}")
               }
            }
        }
        ...
    }
}

Dockerfile (from root path on GitHub repository):

FROM python:alpine3.18
WORKDIR /app
COPY requirements.txt /app
RUN pip install -r requirements.txt
EXPOSE 5000
COPY . /app
CMD ["flask", "run","--host","0.0.0.0","--port","5000"]

In previous stages, docker containers are successfully used.
EDIT:
I needed to apply this workaround: How to Setup Docker in Jenkins on Mac - Harshit Yadav - Medium because I have faced docker command not found issue before this one.
I assume that the user for Jenkins does not have permissions to write in ./docker dir but I’m not sure which user this is.
Every help is welcome. Thank you in advance for your time.

2

it’s trying to create .docker on the root of the filesystem /.

should it be using ./.docker instead of /.docker?

3

Hi @krachynski , thank you a lot for your fast response! :slight_smile:
Good idea, do you know maybe how to change/configure this? Thanks!

4

Honestly, I’m not sure. I’ve never known docker itself to try and create a directory at root.

6

I solved reported issue by setting HOME to ${env.WORKSPACE} inside mentioned Jenkins stage:

environment {
                HOME = "${env.WORKSPACE}"
            }

I hope it helps someone.

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