$ rocker --home --user hello-world --noex
Plugins found: ['dev_helpers', 'home', 'nvidia', 'pulse', 'user']
Active extensions ['home', 'user']
Writing dockerfile to /tmp/tmpwfb8q_7_/Dockerfile
vvvvvv
# Preamble from extension [home]

# Preamble from extension [user]


FROM hello-world
# Snippet from extension [home]

# Snippet from extension [user]
# make sure sudo is installed to be able to give user sudo access in docker
RUN apt-get update \
 && apt-get install -y \
    sudo \
 && apt-get clean

RUN useradd -U --uid 1000 -ms /bin/bash osrf \
 && echo "osrf:osrf" | chpasswd \
 && adduser osrf sudo \
 && echo "osrf ALL=NOPASSWD: ALL" >> /etc/sudoers.d/osrf
# Commands below run as the developer user
USER osrf


^^^^^^
Building docker file with arguments:  {'path': '/tmp/tmpwfb8q_7_', 'rm': True, 'decode': True, 'nocache': False, 'tag': 'rocker_hello-world_home_user'}
building > Step 1/4 : FROM hello-world
building >  ---> fce289e99eb9
building > Step 2/4 : RUN apt-get update  && apt-get install -y     sudo  && apt-get clean
building >  ---> Running in 6f95c70df683
2 osrf@osrf-toughpad1:~$ docker run -ti --rm 6f95c70df683
Unable to find image '6f95c70df683:latest' locally
docker: Error response from daemon: pull access denied for 6f95c70df683, repository does not exist or may require 'docker login'.
See 'docker run --help'.
125 osrf@osrf-toughpad1:~$ docker run -ti --rm fce289e99eb9 bash
docker: Error response from daemon: OCI runtime create failed: container_linux.go:344: starting container process caused "exec: \"bash\": executable file not found in $PATH": unknown.
127 osrf@osrf-toughpad1:~$ docker run -ti --rm fce289e99eb9 sh
docker: Error response from daemon: OCI runtime create failed: container_linux.go:344: starting container process caused "exec: \"sh\": executable file not found in $PATH": unknown.
127 osrf@osrf-toughpad1:~$ docker run -ti --rm fce289e99eb9 

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
    (amd64)
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
 https://hub.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/get-started/