GitLab

It's possible to use a specific Docker image for the whole pipeline or for a specific job.

For example, I would like to display a message from my CI script using NodeJS, I will write something like that:

hello_javascript:
  image: node:slim # 1️⃣
  stage: polyglot
  tags: [docker]
  variables: 
    HELLO_MESSAGE: "Hello from JavaScript"
    SOURCE_CODE: | # 2️⃣
      message = process.env.HELLO_MESSAGE
      console.log(message)
  script: 
    - node -e "$SOURCE_CODE" # 3️⃣ 4️⃣

• 1️⃣ use the keyword image to use a docker image
• 2️⃣ you can create a variable with a multiline string with the pipe notation
• 3️⃣ you can evaluate a JavaScript code in a string with NodeJS with the flag e: node -e "console.log('👋 hello')"
• 4️⃣ don't forget to surround the variable with " to avoid interpolation issues

TODO:

Do the same thing as above, but with Python

• create a merge request from this issue
• open the WebIDE
• update the .gitlab-ci.yml file
• add a new stage: polyglot
• add a new job: hello_python belonging to polyglot
• use the python:slim image
• HELLO_MESSAGE value is Hello from Python
• SOURCE_CODE contains your Python source code
• add a script that runs python to execute the content of SOURCE_CODE (and then to display the value of HELLO_MESSAGE)
• commit your changes, it will trigger the pipeline
• observe the pipeline
• observe the output of the pipeline
• merge on master (the pipe will be triggered again)

Help

• To evaluate a string with Python code from the command line, use the flag c: python -c "print('hello')"
• To get the value of an environment variable, use this method: os.environ.get(variable_name)

  • you need to import os package before