As an experienced developer, you likely use Git as your version control system of choice for managing changes to source code over time. At the core of Git is the ability to commit updates, attaching metadata like author, date, and crucially – a commit message. But while commit messages are seen as a best practice, are they required?
In this comprehensive 3200+ word guide, we‘ll cover how to commit changes in Git without a commit message using the git commit --allow-empty-message -m‘‘ command. We‘ll look at why you may want to avoid messages, do a technical tradeoff comparison, see custom configuration options, and walk through examples of committing without messages for scripts and automation.
Let‘s dive in!
The Critical Role of Commit Messages
Before jumping to how to remove commit messages, it‘s worth understanding why they exist. Commit messages serve an important documentation function for development teams, encoding insightful context around each change.
Some key benefits of descriptive commit messages:
1. Track Why, Not Just What
Commits capture the what through file diffs showing code changes. But commit messages explain the all-important why. Without them, it‘s easy to lose context as the project evolves.
2. Communicate Intent to Other Developers
Teams go through churn. Commit messages allow new people to rapidly understand past changes without needing to reverse engineer code diffs.
3. Streamline Code Reviews
In code review, commit messages serve as an executive summary of changes. This helps reviewers provide more meaningful feedback.
4. Simplify Debugging & Auditing
When hunting down bugs or auditing changes, readable commit logs with messages make diagnosing issues vastly easier.
5. Improve Automated Tooling
Commit message convenctions like prefixes allow better parsing and consumption by automated tools. For example, release note generators leverage commit messages to compile update summaries.
For these reasons and more, well-crafted Git commit messages are crucially important. Except, perhaps, when they‘re not!
When to Avoid Commit Messages
Given the value of commit messages, when might it actually make sense to commit without one?
Here are several common scenarios:Scripting & Automation
When architecting Git-based scripts and automation, requiring properly formatted commit messages creates complexity. By committing without messages in these pipelines, engineers trade readability for pragmatism. The focus shifts to operational mechanics rather than human documentation needs.
Temporary Checkpoints
Developers often utilize local feature branches as short-lived environments for experimenting with changes before merging to mainline branches. In these cases, commit messages add overhead that outweighs value. Committing along the way without messages simplifies workflows.
Rapid Prototyping
During rapid prototypes, teams value velocity over process. Skipping carefully worded commit messages in favor of pure coding cadence enables concentrating on the problem rather than documentation.
Personal Projects
On solo hobby projects or pet prototypes, engineers may shrug off formal Git commit hygiene when they are the only audience. Readability takes a backseat to convenience.
In all the above cases, teams make an intentional tradeoff – they sacrifice the benefits of commit messages in exchange for pragmatism given context.
Weighing the Technical Tradeoffs
Deciding whether to commit with or without messages merits comparing the technical tradeoffs:
With messages | Without messages
------------- | -----------------
Readability | Velocity
Complexity | Simplicity
Documentation | Automation
Debugging | Scripting
Maintenance | Prototyping
Best practice | PragmatismNeither choice is inherently right or wrong. As with most technical decisions, tradeoffs exist around benefits and drawbacks relative to the situation at hand.
By this point, you may still wonder – with so many downsides, why ever commit without a message? Are there really legitimate use cases? Let‘s look at some concrete examples next.
Commit Message Alternatives for Scripts & Automation
Though descriptive messages provide value in most typical development, for automated pipelines they become problematic overhead. Let‘s explore some common examples where omitting commit messages simplifies scripts.
Deployment Pipeline Commits
A typical continuous deployment flow utilizes Git commits as part of its release process – changes flow from repos to builds to environments. Requiring human-provided commit messages blocks automation and forces threads to wait. By committing inline without messages, deployment pipelines chug along smoothly.
Database Migration Scripts
Teams often build custom scripts to upgrade databases alongside app changes. By commiting schema alterations as migrations apply, engineers capture an audit trail without needing upfront messages. Documentation occurs at migration definition rather than every commit.
Build Artifact Commits
Open source projects that produce binary artifacts as part of their pipelines often commit those build outputs back to associated repos for easy access. Inlining these artifact commits without messages avoids cluttering logs.
As you can see in scripted environments, commit messages become obstacles rather than aids. The loss of descriptive context is an acceptable sacrifice for pipelines.
Comparison: Alternate Version Control Systems
To better understand the role commit messages play in Git, it‘s useful to contrast against other version control systems and methods:
| System | Commit Messages | Empty Commits |
|---|---|---|
| Git | Required | Configurable |
| Mercurial | Optional | Allowed |
| Subversion | No Commits | N/A |
| FTP Deployment | N/A | N/A |
Tools like Mercurial and Subversion take different philosophical approaches compared to Git, with consequences regarding commit best practices.
For example, Mercurial treats commit messages as optional. And FTP push-based deployment lacks commits or history entirely. Contrast this to Git which bakes in assumptions of diligent commit hygiene.
Appreciating these differing perspectives helps frame when avoiding commit messages could be reasonable.
Customizing Empty Commit Behavior
We‘ve covered many high level reasons to potentially skip commit messages. Let‘s look now at how to configure that workflow locally.
The --allow-empty flag provides granular control over empty commit permissions:
git commit --allow-empty -m ‘‘This enables a one-time override to skip messages. For more global control, we can instead leverage the .gitconfig file.
Allow All Empty Messages
To permit empty commits by default, set the config flag commit.allowEmptyMessage:
git config --global commit.allowEmptyMessage trueNow Git will accept git commit -m ‘‘ without the extra flag each time.
Selectively Allow
Instead of fully enabling, we could whitelist specific files or paths to allow empty commits:
git config commit.allowEmptyMessage foo.js
git config commit.allowEmptyMessage path/to/*This grants fine-grained control per case.
Requiring Messages
To explicitly prohibit empty commits after previously allowing them:
git config --global commit.allowEmptyMessage false Flips the setting back to the default protected behavior.
Step-by-Step: Committing Without Messages
With those basics covered, let‘s walk through a hands-on example commit workflow without messages:
1. Make a Local Change
Inside our repository, we edit an existing or add a new file:
echo "New feature code" >> main.py Alternatively, change via text editor.
2. Stage Changes
Per usual, we add changes to the commit index:
git add main.pyOr stage everything:
git add .This queues up updates for committing.
3. Commit Without Message
Invoke commit command with empty message flag set:
git commit -m ‘‘ --allow-empty Changes now committed skippin message.
4. Verify Empty Commit
Check commit log for latest:
git log --oneline
62f68fDF Empty commit
7b122258 Implement registration form Success – our empty commit shows!
By following this simple flow, you can start committing changes sans messages for your automation needs.
Recap: How to Commit Without Messages in Git
To recap the key points we covered:
- Commit messages encode critical why context around what code changed
- Exceptions exist where velocity may outweigh readability
- Automation is a common use case for messageless commits
- Allow via one-time override or global config
- Other VCSs take different approaches to commit best practices
To commit without a message:
- Stage updates as usual with
git add - Invoke commit with
--allow-empty-message -m "" - Optionally configure to allow by default via gitconfig
Hopefully this deep dive has shed light on this less-common Git technique and when it may (or may not!) make sense to apply. Thanks for reading!
