A brief analysis of the reasons why files are deleted by the git pull command

When using Git for version control, we often use the git pull command to get the latest code from the server to keep the local code base in sync with the code base on the server. However, sometimes after using the git pull command, we find that some files that already exist locally have been deleted. So, what's going on?

In this article, we will detail the reasons why the git pull command deletes files, and how to avoid this situation.

1. Principle of git pull command

The git pull command will obtain the latest code from the server and update the code to the local code base. In the process of implementing this, Git will follow the following steps:

1. Get the latest code on the server.
2. Compare the latest code on the server with the code in the local code base.
3. Get the latest version of the files that need to be updated in the local code base from the server.
4. Merge the files in the local code base that do not need to be updated with the files on the server.

The third step in the above steps is what causes the git pull command to delete local files.

2. Why does the git pull command delete files?

In the third step, Git will compare the local code base with the code on the server to determine which files need to be updated. If a file exists in the local code base and has been deleted on the server, Git will mark the file as needing deletion and delete the file in the local file system.

The reason for this is to keep the local code base in sync with the code on the server. If we delete a file in the local code base, but the file still exists in the code base on the server, then when we use the git pull command, the file will be reacquired and updated to the local code base. To avoid this situation, Git will delete files in the local code base that no longer exist on the server.

3. How to prevent the git pull command from deleting files?

Although Git will protect our code base to a certain extent, sometimes its behavior may still make us feel uneasy. We may not want local files to be automatically deleted when using the git pull command. In order to avoid this situation, we can take the following methods:

1. Submit local files

Before the git pull command, you can use git add and git commit command to submit local files that need to be retained to the local code base. In this way, even if the local file is deleted by the git pull command, we can restore to the previously submitted version through the git checkout command.

2. Ignore files of specific types

In the .gitignore file, we can specify to ignore files with specific extensions. If we have some files that do not need to be synchronized to the server (such as log files), we can add the extensions of these files to the .gitignore file, and Git will no longer synchronize these files to the server.

3. Back up local files

If we don’t want the git pull command to delete local files, we can use the file backup tool to back up the files we want to keep first to prevent accidental deletion.

Summary

This article introduces the reasons why the git pull command deletes files, and provides three methods to avoid the git pull command deleting files. I hope that through the introduction of this article, readers can better understand how Git works and how to better manage code under Git version control.

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