Cannot Overwrite Settings From Job In Pipeline Template

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Introduction

When working with pipeline templates in a shared environment, it's essential to understand how settings are merged and overwritten. However, there's a known issue where settings from a job cannot be overwritten to empty when using a pipeline template. In this article, we'll delve into the problem, its expected behavior, and provide a step-by-step guide on how to reproduce it.

Understanding the Issue

What Happened

When using a pipeline template and shared settings, it's not possible to overwrite the "settings" from a job to empty. This behavior is different from when settings are originally defined in the pipeline template. If settings are defined in shared, they are set to the job. On the other hand, if settings are defined in the job, the result is a deep merge of the pipeline template and the job's settings.

Example Scenario

To illustrate this issue, let's consider an example. Suppose we have a pipeline template that defines settings for Slack, including the slack.minimized property. If we set channels and statuses in the job, the resulting settings will include channels, statuses, and minimized. This is because the job's settings are merged with the pipeline template's settings using a deep merge strategy.

What You Expected to Happen

The expected behavior is that the job can override the settings to empty. Additionally, the shared and job overwrite methods should be aligned when using pipeline templates.

How to Reproduce It

To reproduce this issue, follow these steps:

  1. Define settings in the "shared" section and empty settings in the "job" section as follows:
template: screwdriver-cd-test/test-pipeline-template@1.0.1

shared:
  settings:
    slack:
      channels:
        - group:foo
      statuses:
        - FAILURE

jobs:
  main:
    settings: {}
  1. Run the pipeline and observe the resulting settings. You should see that the job's empty settings have not overwritten the shared settings.

Expected Behavior

The expected behavior is that the job's empty settings should overwrite the shared settings. This means that the resulting settings should be empty, with no properties set.

Workaround

Unfortunately, there is no official workaround for this issue. However, you can consider the following alternatives:

  1. Define settings in the job: Instead of defining settings in the shared section, define them in the job section. This will allow you to overwrite the settings to empty.
  2. Use a different merge strategy: If you're using a deep merge strategy, try using a different merge strategy, such as a shallow merge or a merge that ignores the pipeline template's settings.

Conclusion

In conclusion, the issue of not being able to overwrite settings from a job in a pipeline template is a known problem. While there is no official workaround, you can consider defining settings in the job or using a different merge strategy. We hope that this article has provided valuable insights into this issue and has helped you understand the expected behavior and how to reproduce it.

Troubleshooting Tips

If you're experiencing issues with settings not being overwritten, try the following troubleshooting tips:

  1. Check the pipeline template: Ensure that the pipeline template is correctly defined and that the settings are not being overridden by the template.
  2. Verify the shared settings: Check that the shared settings are correctly defined and that they are not being overwritten by the job's settings.
  3. Use the debug log: Enable the debug log to see the exact settings being merged and overwritten.

FAQs

Q: Why can't I overwrite settings from a job in a pipeline template?

A: The issue is due to the way settings are merged and overwritten in pipeline templates. When settings are defined in the shared section, they are set to the job. However, when settings are defined in the job, the result is a deep merge of the pipeline template and the job's settings.

Q: How can I overwrite settings from a job in a pipeline template?

A: Unfortunately, there is no official workaround for this issue. However, you can consider defining settings in the job or using a different merge strategy.

Q: What is the expected behavior when using a pipeline template?

Q: What is the issue with overwriting settings from a job in a pipeline template?

A: The issue is that when using a pipeline template and shared settings, it's not possible to overwrite the "settings" from a job to empty. This behavior is different from when settings are originally defined in the pipeline template.

Q: Why is this issue occurring?

A: The issue is due to the way settings are merged and overwritten in pipeline templates. When settings are defined in the shared section, they are set to the job. However, when settings are defined in the job, the result is a deep merge of the pipeline template and the job's settings.

Q: How can I reproduce this issue?

A: To reproduce this issue, follow these steps:

  1. Define settings in the "shared" section and empty settings in the "job" section as follows:
template: screwdriver-cd-test/test-pipeline-template@1.0.1

shared:
  settings:
    slack:
      channels:
        - group:foo
      statuses:
        - FAILURE

jobs:
  main:
    settings: {}
  1. Run the pipeline and observe the resulting settings. You should see that the job's empty settings have not overwritten the shared settings.

Q: What is the expected behavior when using a pipeline template?

A: The expected behavior is that the job can override the settings to empty. Additionally, the shared and job overwrite methods should be aligned when using pipeline templates.

Q: How can I fix this issue?

A: Unfortunately, there is no official workaround for this issue. However, you can consider the following alternatives:

  1. Define settings in the job: Instead of defining settings in the shared section, define them in the job section. This will allow you to overwrite the settings to empty.
  2. Use a different merge strategy: If you're using a deep merge strategy, try using a different merge strategy, such as a shallow merge or a merge that ignores the pipeline template's settings.

Q: What are some troubleshooting tips for this issue?

A: If you're experiencing issues with settings not being overwritten, try the following troubleshooting tips:

  1. Check the pipeline template: Ensure that the pipeline template is correctly defined and that the settings are not being overridden by the template.
  2. Verify the shared settings: Check that the shared settings are correctly defined and that they are not being overwritten by the job's settings.
  3. Use the debug log: Enable the debug log to see the exact settings being merged and overwritten.

Q: Is this issue specific to a particular version of the pipeline template?

A: No, this issue is not specific to a particular version of the pipeline template. It's a known issue that can occur in any version of the pipeline template.

Q: Can I report this issue to the pipeline template developers?

A: Yes, you can report this issue to the pipeline template developers. They may be able to provide a fix or a workaround for this issue.

**Q: Are there any known workarounds for this issue?------------------------------------------------

A: Unfortunately, there are no known workarounds for this issue. However, you can consider the alternatives mentioned above, such as defining settings in the job or using a different merge strategy.