Now, if a developer tries to commit with a bad message, Git aborts. This doesn't just work for command-line commits; it works for GUI tools and IDEs because everything eventually writes to COMMIT-EDITMSG .

Example commit-msg hook snippet (bash):

The --wait flag is crucial for graphical interfaces like VS Code . It instructs the terminal to pause until you explicitly close the tab or window containing your message, signaling to Git that your message is finished. 🏗️ The Anatomy of a Perfect Commit Message

It fills the file with template information, such as the files changed and instructions on how to write the message (lines starting with # are ignored).

This command is used to modify the most recent commit. It opens an editor with the current commit message in the COMMIT-EDITMSG file.

It acts as a buffer. Once you save and close the editor, Git reads the text from this file to finalize the commit.

It’s important to note that this location is relative to the repository’s work tree, and Git uses the command git rev-parse --git-dir to always find the correct directory, especially when working with advanced features like worktrees. The path to this file is passed as the sole parameter to certain Git hooks, such as the commit-msg hook, allowing those scripts to read and modify the message before the commit is finalized.

The file is a temporary text file created by Git to store your commit message during the editing process.

: The top lines are empty, waiting for your input.

Git hooks are scripts that run automatically before or after specific Git actions. The commit-msg hook operates directly on the COMMIT-EDITMSG file. Teams use this hook to build automated validation tools that scan the file before a commit goes live.

If you see an error about a .swp file, it means your editor crashed or is still open in another window. You can usually delete the .swp file safely if you aren't currently editing. 🚀 Pro Tip: Reviewing Your Work

The COMMIT_EDITMSG file is not alone in Git's temporary directory. Git uses several other files for similar purposes during complex operations, and understanding them can help you troubleshoot when things go wrong.

When you save and close the editor, Git reads the contents of COMMIT_EDITMSG , strips out the comments, and uses the remaining text as the commit message.

When you run the command git commit , Git initializes the commit process but needs a description of the changes. : Git creates .git/COMMIT-EDITMSG .

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