Docker-in-Docker GitLab CI

[netzdoktor]

I am using cross in a docker-in-docker scenario on GitLab CI. I used the approach given in #273 (comment), which unfortunately did not work anymore. I am still getting:

sh: 1: cargo: not found

So I used CROSS_DOCKER_IN_DOCKER=true (as recommended in another comment) and the result is this:

error: `"/usr/bin/docker" "inspect" "runner-27oc64mp-project-587-concurrent-0"` failed with exit code: Some(1)

I have the latest release of cross installed (but checking a diff with master didn't reveal relevant changes as far as I can tell).

I am wondering why this does not work in the GitLab environment...

Thanks in advance!

[gaoyifan]

Gitlab runner set a different hostname, which is not equal to conatiner name. eg:

container name:  runner-dtfmkqbc-project-33-concurrent-0-22fbe3329596e791-build-2
hostname:        runner-dtfmkqbc-project-33-concurrent-0

In cross, we assume that hostname is equal to container name:
https://github.com/rust-embedded/cross/blob/4f213ba07b214d36225be63e5b72a6346937a699/src/docker.rs#L235-L237

I have not find a solution yet.

[gaoyifan]

Workaround:

  script:
    - export HOSTNAME=$(docker ps -ql)
    - cross build ...

[Kaiser1989]

Workaround:

  script:
    - export HOSTNAME=$(docker ps -ql)
    - cross build ...

Calling $(docker ps -ql) returns empty string in my case. Are there any other possibilities to get correct container name?

[Alexhuszagh]

Calling $(docker ps -ql) returns empty string in my case. Are there any other possibilities to get correct container name?

That suggests there are no created containers, of any state (running or stopped). Try using docker ps -a to print all running containers, which I expect would be empty.

[Alexhuszagh]

This is a duplicate of #273. We've documented how to use docker-in-docker, remote docker (required if Gitlab is using a remote Docker connection, such as with a host at tcp://docker:2375/).

[sybernomad]

Workaround:

  script:
    - export HOSTNAME=$(docker ps -ql)
    - cross build ...

This didn't work for me when I had multiple cross builds running in parallel. I got around it by doing this instead:

   script:
     - export HOSTNAME=$(docker ps -aqf "name=^$HOSTNAME" | awk 'NR==1{print $1}')
     - cross build ...