How can I use conditional variables in GitLab CI?

How can I use conditional variables in GitLab CI?

You can use conditional variables in GitLab CI by defining them in your .gitlab-ci.yml file. This allows you to set variables based on certain conditions, like the branch name or the presence of a file.

Can you give me an example of how to set a variable based on the branch name?

Sure! You can use the only or rules keywords. For example:

variables:
  MY_VAR: "default_value"

job:
  script:
    - echo $MY_VAR
  rules:
    - if: '$CI_COMMIT_BRANCH == "main"'
      variables:
        MY_VAR: "main_value"

What happens if the condition is not met?

If the condition is not met, the variable will retain its default value or any value set in a previous job. In the example above, if the branch is not main, MY_VAR will be default_value.

Can I use multiple conditions for a single variable?

Yes, you can use multiple conditions by combining them with logical operators in the rules section. For example:

rules:
  - if: '$CI_COMMIT_BRANCH == "main" || $CI_COMMIT_BRANCH == "develop"'
    variables:
      MY_VAR: "dev_or_main_value"