Скачать или смотреть How to Create Multiline Environment Variables in GitHub Actions for Multiple Jobs

Learn how to effectively manage multiline environment variables in GitHub Actions across multiple jobs, ensuring smooth execution without errors.
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Managing Multiline Environment Variables in GitHub Actions

When working on continuous integration with GitHub Actions, you may encounter scenarios where you need to serve your application configurations or data through multiline environment variables. This post will guide you through how to create and manage these variables across multiple jobs in GitHub Actions. Let's explore the case where you want to create a multiline text file, upload it, and then utilize it in a subsequent job without running into issues related to timing or errors.

The Problem

You have a job in your CI/CD pipeline that generates a multiline text file, uploads it, and you want to append its content to a code file in another job. However, a common issue arises when the second job is executed before the first job completes. As a result, it may lead to a failed attempt to locate and download the file, resulting in frustrating errors and delays in your workflow.

Creating the Multiline Text File

Step 1: Create a Job to Generate and Upload the File

Start by creating a job that will write the multiline environment variable to a text file. Here’s how you can do it effectively:

[[See Video to Reveal this Text or Code Snippet]]

Explanation:

The cat command creates a new file called data.txt containing the multiline content.

The upload-artifact action is used to upload the generated data.txt file for use in subsequent jobs.

Appending Content in a Subsequent Job

Step 2: Create a Job to Download and Append Content

Once your file is successfully uploaded, you’ll want to create a second job that downloads this file and appends its content to your main code file. Here’s a basic structure for that:

[[See Video to Reveal this Text or Code Snippet]]

Explanation:

The needs parameter ensures that the test_file job will not start until the create_file job has completed successfully.

This job downloads the data.txt and appends its contents to main.py before executing the Python script.

Common Issues and Solutions

Error Handling

One of the common errors you might encounter while using the upload and download actions is a 404 error. This typically occurs if there’s a typo in the version of the action used. For example, if you mistakenly wrote actions/upload-artifact@ 1, it should be corrected to actions/upload-artifact@ v1 to avoid such errors.

Final Thoughts

By following this structured process, you can seamlessly create, upload, and manage multiline environment variables across multiple jobs in GitHub Actions. Remember to always check for correct action versions to prevent errors during the pipeline execution. This approach not only saves you from tedious command lines to append content, but it also ensures that your code integrates smoothly across different jobs.



Feel free to customize the YAML snippets based on your specific needs or refined practices within your project!