How to use my own Docker image with GitLab CI?

Question

I want to use this Docker image:

https://cloud.docker.com/u/steevanb/repository/docker/steevanb/php-code-sniffs

From this Dockerfile:

https://github.com/steevanb/docker-php-code-sniffs/blob/master/Dockerfile

Locally, i use it like that:

#!/bin/bash

set -e

readonly PROJECT_DIR=$(realpath $(dirname $(realpath $0))/..)

docker run \
    --rm \
    -e PHPCS_PARAMETERS="--warning-severity=0 --ignore=/var/phpcs/var,/var/phpcs/vendor/" \
    -e PHPCS_BOOTSTRAP=/var/phpcs.bootstrap.php \
    -v ${PROJECT_DIR}:/var/phpcs:ro \
    -v ${PROJECT_DIR}/phpcs.bootstrap.php:/var/phpcs.bootstrap.php:ro \
    steevanb/php-code-sniffs:2.0.9

I don't understand how i can use it in Gitlab CI, with same parameters?

I've tried some things, like that:

phpcs:
    image:
        name: steevanb/php-code-sniffs:2.0.9
        entrypoint: ["/var/steevanb/php-code-sniffs/vendor/bin/phpcs", "$CI_PROJECT_DIR/project/user/src"]
    # don't need it, everything is done by overloading entrypoint
    script: echo $CI_PROJECT_DIR

But i have this error, seems $CI_PROJECT_DIR is not replaced with the expected value:

RROR: The file "$CI_PROJECT_DIR/project/user/src" does not exist.

Answer 1

In order to use your own image in default runners, you need to put image In the beginning of .gitlab-ci.yml , you should write it like:

image: python:alpine

before_script:
  - pip install mkdocs
...

Answer 2

If you are using gitlab CI/CD you can use your image by uploading the images to docker hub.

Steps to produce docker image:
1.compose a Docker file in your local machine.
2.build a docker image using that docker file.
3.name the docker image, create or login to docker hub
4.publish the image to you docker repository.

Reference: click here

Answer 3

You can pass environment variables using either GitLab Secret Variables (set in the project settings) or by specifying variables in .gitlab-ci.yml .

See GitLab CI YAML Variables documentation.

For example, in your .gitlab-ci.yml you may be able to specify:

variables:
  PHPCS_PARAMETERS: --warning-severity=0 --ignore=/var/phpcs/var,/var/phpcs/vendor/
  PHPCS_BOOTSTRAP: PHPCS_BOOTSTRAP=/var/phpcs.bootstrap.php

image: steevanb/php-code-sniffs:2.0.9

your_job:
  script:
  - your_script

In this example, the variables and image are set globally. You can also set both of these within each job rather than globally.