Скачать или смотреть How to Override Environment Variables in Github Actions

Learn how to effectively override environment variables in GitHub Actions workflows with a simple step-by-step guide.
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Understanding the Problem: Overriding Environment Variables in GitHub Actions

When working with GitHub Actions, you may encounter situations where you need to change the values of environment variables during the execution of your workflow. For instance, in a given scenario, the variable FOO is initially set to bar1, but you want to change it to bar2 during the job execution.

You might run the following code:

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However, you'll notice that the echo command returns bar1, indicating that the variable hasn’t been overridden as intended. This situation prompts the essential question: How can I effectively override an environment variable in GitHub Actions?

The Solution: Overriding Environment Variables

To successfully override environment variables in GitHub Actions, you can make use of the $GITHUB_ENV syntax, which allows you to define variables that persist beyond the scope of the current shell. This process is quite simple and can be done by following these steps:

Step 1: Define the Variable in the Workflow

Initially, you define your environment variable in the workflow file under the env key. Here’s a basic overview:

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Step 2: Override the Variable

To change the value of the previously defined environment variable, you can append the new variable declaration to the $GITHUB_ENV file. This can be done using the following command within your job:

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Complete Workflow Example

Here is how your entire GitHub Actions workflow would look after including the override:

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Important Notes:

Make sure that you run the echo command that modifies $GITHUB_ENV before you try to access the variable.

This method is useful for modifying variables for subsequent steps in the job.

If you're working with multiple jobs, you might need to take different approaches, as $GITHUB_ENV works within the same job context.

Conclusion: Mastering Environment Variables in GitHub Actions

By following these simple steps, you're well on your way to mastering the overriding of environment variables in GitHub Actions. This capability enhances the flexibility and dynamism of your CI/CD processes.

Feel free to explore and apply this knowledge in your own workflows, and watch your automation become even more powerful.