Understanding the file type variable expansion change in GitLab 15.7

GitLab 15.7 introduced a change where file type variables in CI jobs are no longer expanded, which previously allowed the contents of a file to be accessed through another variable, resulting in errors for jobs that utilized this behavior. This change was made to enhance security by preventing the potential exposure of sensitive data in the build environment, as file expansion could inadvertently reveal such information. Before version 15.7, users found variable expansion useful, but it also posed security risks, leading to its deprecation in version 15.5 and removal in 15.7, although a follow-up removal notice was not included, causing some upgrading users to miss the deprecation notice. Users need to review their CI jobs to identify and amend any instances where file variables are referenced within other variables to ensure their workflows continue to function after the upgrade. GitLab continues to refine its processes for communicating the impact of feature changes, emphasizing the complexity of secrets and variable handling within DevSecOps platforms and encouraging users to contact the Verify team for clarification on how changes might affect workflows.

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