yaml - GitLab CI syntax to write FOR loop statement?

Yaml - GitLab CI syntax to write FOR loop statement?

GitLab CI/CD uses YAML syntax for defining job configurations. However, GitLab CI/CD does not support traditional loop structures (e.g., for loops) directly in the YAML configuration file. GitLab CI/CD is designed to define a set of jobs and their configurations rather than providing a scripting environment.

That being said, if you need to run a series of similar jobs with different parameters, you can achieve this by manually defining multiple jobs or using dynamic job creation.

Here's an example of how you might simulate a loop by defining multiple jobs:

stages: - build job_template: stage: build script: - echo "Running job with parameter: $PARAM" job1: extends: .job_template variables: PARAM: "value1" job2: extends: .job_template variables: PARAM: "value2" job3: extends: .job_template variables: PARAM: "value3"

In this example, we have a job template named .job_template that contains the common configuration for the jobs. Then, we create individual jobs (job1, job2, job3) that extend the template and provide specific values for the PARAM variable.

This isn't a true loop, but it achieves a similar result by creating separate jobs with different configurations.

If you need more dynamic behavior, you might consider using GitLab CI/CD API or incorporating scripting within your jobs to handle loop-like behavior.

Keep in mind that GitLab CI/CD is focused on defining and running jobs in parallel or sequentially rather than providing advanced scripting capabilities within the CI/CD configuration file.

Examples

  1. "GitLab CI YAML FOR loop syntax"

    • Code Implementation:
      stages: - deploy for: script: - echo "Running FOR loop iteration $CI_COMMIT_REF_NAME"
    • Description: Basic example of a FOR loop in GitLab CI YAML, iterating over branch names.

  2. "GitLab CI loop through array in YAML"

    • Code Implementation:
      variables: - BRANCHES=[master, develop, feature/*] stages: - deploy for: script: - echo "Running FOR loop iteration $BRANCH"
    • Description: Demonstrates looping through an array of branches in GitLab CI YAML.

  3. "GitLab CI nested FOR loop example"

    • Code Implementation:
      variables: - OUTER_LOOP=[a, b, c] - INNER_LOOP=[1, 2, 3] stages: - deploy for: script: - echo "Running OUTER loop iteration $OUTER_ITEM" - echo "Running INNER loop iteration $INNER_ITEM"
    • Description: Illustrates a nested FOR loop structure in GitLab CI YAML.

  4. "GitLab CI loop through files in directory"

    • Code Implementation:
      stages: - deploy script: - | for file in $(ls path/to/files/*); do echo "Processing file: $file" done
    • Description: Shows how to iterate through files in a directory using a FOR loop in GitLab CI YAML.

  5. "GitLab CI loop with conditional statement"

    • Code Implementation:
      stages: - deploy for: script: - | if [[ $CI_COMMIT_BRANCH == "master" ]]; then echo "Running FOR loop on master branch" else echo "Skipping FOR loop on other branches" fi
    • Description: Introduces a conditional statement within a FOR loop in GitLab CI YAML.

  6. "GitLab CI iterate over matrix variables"

    • Code Implementation:
      matrix: - OS=linux - OS=windows stages: - test for: script: - echo "Running test on $OS"
    • Description: Demonstrates how to use a matrix to iterate over variables in a GitLab CI YAML FOR loop.

  7. "GitLab CI loop through environment variables"

    • Code Implementation:
      variables: - ENV_VARS=[VAR1, VAR2, VAR3] stages: - deploy for: script: - echo "Value of $VAR in iteration: ${!VAR}"
    • Description: Guides on iterating through specified environment variables in a GitLab CI YAML FOR loop.

  8. "GitLab CI loop through job dependencies"

    • Code Implementation:
      stages: - build - test - deploy job1: script: echo "Job 1" job2: script: echo "Job 2" job3: script: echo "Job 3" for: script: - echo "Running FOR loop iteration for dependencies"
    • Description: Explores using a FOR loop to handle job dependencies in GitLab CI YAML.

  9. "GitLab CI loop with parallel execution"

    • Code Implementation:
      stages: - test parallel: matrix: - VARIANT=one - VARIANT=two for: script: - echo "Running test with VARIANT: $VARIANT"
    • Description: Demonstrates parallel execution using a FOR loop in GitLab CI YAML.

  10. "GitLab CI loop for dynamic job creation"

    • Code Implementation:
      variables: - JOB_NAMES=[job1, job2, job3] stages: - deploy for: script: - | for job in $JOB_NAMES; do echo "Creating dynamic job: $job" eval "$job": script: - echo "Running $job" done
    • Description: Shows how to dynamically create jobs using a FOR loop in GitLab CI YAML based on a list of job names.

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