How to run a mounted shell-script inside a docker container? - docker

Question

I'm trying to run a mounted shell-script inside a docker container by following these steps:
build stage: build the docker image.
test stage: mount a directory into the container at runtime with a shell-script file inside.
test stage: run the shell-script file from inside the docker.
could someone please explain how this should be done?
see line: #- ?? HERE I SHOULD RUN THE TEST: /test/check.sh ??
services:
- docker:dind
stages:
- build
- test
before_script:
- docker info
# Build the docker image
build:
image: docker:latest
services:
- docker:dind
before_script:
- docker login docker.example.com -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD
only:
- master
script:
- docker build -t our-docker .
- docker save our-docker > our-docker.tar
artifacts:
paths:
- our-docker.tar
expire_in: 1 week
stage: build
test:
image: docker:latest
only:
- master
script:
- docker load < our-docker.tar
- docker run --volume source="$(pwd)/test",target="/test" our-docker
#- ?? HERE I SHOULD RUN THE TEST: /test/check.sh ??
stage: test

Answer 1

First, there was an issue with the docker run command itself:
docker run --volume source="$(pwd)/test",target="/test" our-docker # buggy
as the syntax to setup a bind-mount is:
either docker run -v "$PWD/test":"/test" our-docker
(-v being the short form of --volume)
or docker run --mount type=bind,source="$PWD/test",target="/test" our-docker
(Note: I replaced above "$(pwd)" with the special shell variable "$PWD" which avoids spinning yet another process.)
Next, you cannot just append the line /test/check.sh after the docker run line because you precisely need to run that command within the context of docker run. To this aim, you may want to use the pattern I proposed in this other SO thread: How do I set docker-credential-ecr-login in my PATH before anything else in GitLab CI (which contains more details/remarks about set -e, quotes and shell escaping in the context of that pattern).
Wrap-up
More precisely, could you try the following adaptation of your .gitlab-ci.yml? (I've added some ls commands that should help debugging your configuration):
services:
- docker:dind
stages:
- build
- test
before_script:
- docker info
# Build the docker image
build:
image: docker:latest
services:
- docker:dind
before_script:
- docker login docker.example.com -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD"
only:
- master
script:
- docker build -t our-docker .
- docker save our-docker > our-docker.tar
artifacts:
paths:
- our-docker.tar
expire_in: 1 week
stage: build
test:
image: docker:latest
# note: use /bin/sh below as this image doesn't provide /bin/bash
only:
- master
script:
- docker load < our-docker.tar
- echo "$PWD"
- ls
- ls -Rhal test
- |
docker run --rm -v "$PWD/test":"/test" our-docker /bin/sh -c "
set -ex
ls -Rhal /test
/test/check.sh
"
stage: test