export UID="$(id -u)" cannot be used since UID is read only and container is expected to run as non-root

[telefax]

The instructions says

export UID="$(id -u)"

Which on Centos 7 at least results in:
-bash: UID: readonly variable

and then docker-compose fails with:

Step 10/12 : RUN useradd --groups www-data,root --uid $DOCKER_UID --create-home $USER
 ---> Running in a0ac44e61fae
useradd: UID 0 is not unique

So two problems, UID exists already and reseting won't do any difference and
the containers seems to be expected to run as non-root so the documentation needs to clarify this.
You could do something like this:

useradd docker-probind
export PROBIND_USER_UID=$(id -u docker-probind)

and update docker-compose.yml with PROBIND_USER_UID.
Then dont forget to chown -R the git directory with PROBIND_USER_UID, depending on how you run your compose.

[pacoorozco]

The UID environment variable is readonly on bash, you're right! It looks like I'm not using bash 😅 .

So, I think it should be enough just changing the name of the UID variable. The second part of your comment is unclear to me. What the docker is doing is to create a user with the same UID than the one you have outside the docker, just to avoid to change file permissions.

Let me try it!

[pacoorozco]

It works! I've changed the exported variable. See it on master

[telefax]

I ran docker-compose as root and I still gets the same error, so I if I creae a new user account and chow to that user it works, otherwise just getting:

Step 10/12 : RUN useradd --groups www-data,root --uid $DOCKER_PROBIND_UID --create-home $USER
 ---> Running in c62fb3c1ada9
useradd: UID 0 is not unique
ERROR: Service 'app' failed to build: The command '/bin/sh -c useradd --groups www-data,root --uid $DOCKER_PROBIND_UID --create-home $USER' returned a non-zero code: 4

Probably because you cant create a root user inside a container

BTW,
You could add a few screenshots to convince people that it looks much much better than the old probind :-)

Good wok!

[pacoorozco]

Hi @telefax

So you're trying to build the docker as root in your computer... Now I understand what the problem was :-D

I always propose not running anything as root unless it's needed 🤗