Question
Answer and Explanation
To get the ID of a parent pipeline that triggered a child pipeline in GitLab, you can use predefined CI/CD variables. GitLab provides several variables that contain information about the current pipeline and its relationships.
Here's how you can access the parent pipeline ID:
1. Using the `CI_PARENT_PIPELINE_ID` Variable:
- GitLab automatically sets the `CI_PARENT_PIPELINE_ID` variable in child pipelines. This variable contains the ID of the pipeline that triggered the current pipeline. If the current pipeline is not a child pipeline, this variable will be empty.
2. Accessing the Variable in Your GitLab CI/CD Configuration:
- You can access this variable in your `.gitlab-ci.yml` file using the standard variable syntax, which is $CI_PARENT_PIPELINE_ID.
3. Example Usage in `.gitlab-ci.yml`:
job_example:
stage: test
script:
- echo "Parent Pipeline ID: $CI_PARENT_PIPELINE_ID"
- |
if [ -n "$CI_PARENT_PIPELINE_ID" ]; then
echo "This is a child pipeline."
else
echo "This is not a child pipeline."
fi
4. Explanation:
- The example above defines a job named job_example that will be executed in the test stage.
- The script first echoes the value of the CI_PARENT_PIPELINE_ID variable. If the pipeline is a child pipeline, this will output the ID of the parent pipeline.
- The script then checks if the CI_PARENT_PIPELINE_ID variable is not empty. If it's not empty, it means the current pipeline is a child pipeline, and it outputs a corresponding message.
5. Important Considerations:
- The `CI_PARENT_PIPELINE_ID` variable is only available in child pipelines. If your pipeline is not triggered by another pipeline, this variable will be empty.
- You can use this ID to interact with the parent pipeline via the GitLab API if needed.
By using the CI_PARENT_PIPELINE_ID variable, you can easily access the ID of the parent pipeline that triggered your current pipeline in GitLab CI/CD.