How to Execute a Command Before a Git Push

Learn how to run a command to check for large files before pushing changes to your Git repository. This guide will help prevent issues with oversized files during git push operations.
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This video is based on the question https://stackoverflow.com/q/66436022/ asked by the user 'Jean' ( https://stackoverflow.com/u/14877195/ ) and on the answer https://stackoverflow.com/a/66436931/ provided by the user 'LeGEC' ( https://stackoverflow.com/u/86072/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introducing the Issue: Large Files and Git Push

When working with Git, managing your repository can sometimes become tricky, especially when large files are involved. If you've ever tried to git push only to be met with an error due to files larger than 100MB, you might find yourself frustrated. The error halts your push, and you’re left wondering how to prevent it in the future.

Fortunately, there's a way to execute a command before every git push operation, allowing you to check for large files beforehand. In this post, we will guide you through several methods to achieve this, helping you streamline your Git workflow and avoid hiccups caused by oversized files.

Solution Overview: Executing a Command Before Git Push

Method 1: Creating a Git Alias

One way to ensure that a command runs before a git push is to create a Git alias. This method allows you to check for large files by executing a command in a one-liner format. Here’s how:

Open your terminal.

Run the following command:

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With this alias in place, whenever you use git pushcheck, it will automatically check for files exceeding 100MB and prevent the push if any are found, while allowing it to proceed otherwise.

Method 2: Creating a Git Script

Another approach is to create a custom script that handles the check. Follow these steps:

Create a new script named git-pushcheck:

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Add the following code to the script:

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Place this script in a location included in your PATH.

Now, you can use git pushcheck instead of git push, and the script will manage the checks for you.

Method 3: Using a Pre-Push Hook

For a more integrated approach, consider using a Git hook. The pre-push hook allows you to run scripts before pushing changes. Here’s how to set it up:

Navigate to your repository’s hooks directory:

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Create a pre-push script:

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Add the following content to the pre-push script:

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With this hook, every time you attempt to push, the script will check for large files and block the push if they are present. Keep in mind that this method directly integrates with Git’s workflow, making it a very efficient solution.

Conclusion: Managing Large Files Effectively

By implementing one of these methods, you can prevent issues related to large files in your Git repositories. Whether you choose to create an alias, a script, or use a Git hook, each approach provides a reliable way to enhance your Git workflow.

Additional Considerations

Using Git LFS: If you frequently work with large files, consider using Git Large File Storage (LFS) to manage them more effectively.

Customizing Your Checks: Depending on your project's needs, you can modify the commands to target specific file types or locations within your repository.

Have more questions or different use cases? Don’t hesitate to reach out for further insights or clarification on Git commands and operations!

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