git-profile-switch

A safe, one-time CLI tool to set up profile-based Git identity (work / personal) on a single machine using Git’s native configuration features.

This tool helps developers avoid accidentally committing with the wrong name or email — especially on company-provided machines.

The Problem

Many developers use the same machine for:

• Company work repositories
• Personal projects and open-source contributions

Git has only one global identity by default.
This leads to common issues such as:

• Commits pushed with a personal email to a company repo
• Commits pushed with a work email to personal or open-source repos
• Violating company policies unintentionally
• Manually switching git config values back and forth

Git does support conditional configuration, but setting it up correctly is non-trivial and error-prone.

What This Tool Does

git-profile-switch helps you set up profile-based Git identities once, based on repository folder paths.

Specifically, it:

• Creates separate Git config files for different profiles (e.g. work and personal)
• Configures Git’s native includeIf rules to apply identities by folder
• Backs up existing Git configuration before making changes
• Provides read-only commands to verify and diagnose the setup

After setup, Git itself handles identity resolution — this tool does not run again.

What This Tool Does NOT Do

This is intentionally a minimal and conservative tool.

It does not:

• Switch Git identities dynamically at runtime
• Intercept Git commands or commits
• Run in the background
• Modify SSH keys or SSH configuration
• Interact with GitHub or any remote service
• Rewrite commit history
• Install Git hooks
• Require continuous usage after setup

You can uninstall this tool after setup and your configuration will continue to work.

How It Works (High Level)

This tool uses Git’s built-in includeIf feature.

At a high level:

• Repositories under one folder (e.g. ~/code/work) use one identity
• Repositories under another folder (e.g. ~/code/personal) use another identity
• Git resolves the correct identity automatically based on repository location

No custom Git behavior is introduced.

Safety & Trust Guarantees

• No data is uploaded anywhere
• No network calls are made
• No credentials are collected
• No background processes are started
• All changes are local and reversible

This tool is designed to be safe to run on company-managed machines.

Status

This project is under active development.

v1 focuses on:

• Initial setup (init)
• Verification (doctor)
• Status inspection (status)

Advanced features may be considered later, but are intentionally out of scope for v1.

Installation

This tool is designed to be used via npx without permanent installation.

npx git-profile-switch init

You may also install it globally if you prefer:

npm install -g git-profile-switch

Usage

Initialize profile-based identity

git-profile-switch init

This command:

• Prompts for work and personal Git identities
• Creates profile-specific Git config files
• Safely updates your global Git configuration using includeIf

You will be shown a preview and must explicitly confirm before any changes are made.

View current configuration

git-profile-switch status

Shows a read-only summary of detected profile-based Git configuration.

Diagnose configuration issues

git-profile-switch doctor

Performs read-only checks and reports potential problems such as:

• Missing Git installation
• Missing profile files
• Missing or invalid includeIf rules

How Identity Switching Works

This tool uses Git’s built-in conditional configuration feature (includeIf).

At a high level:

• Repositories under a specific directory (e.g. ~/code/work/) use a work identity
• Repositories under another directory (e.g. ~/code/personal/) use a personal identity
• Git resolves the correct identity automatically based on repository location

No background processes, hooks, or runtime switching are involved.

Safety & Corporate Use

This tool is designed to be safe to use on company-managed machines.

It:

• Does not run in the background
• Does not intercept Git commands
• Does not modify SSH configuration
• Does not communicate with GitHub or any external service
• Does not require continued usage after setup

All changes are local, transparent, and reversible.

You can uninstall the tool after setup and the configuration will continue to work.

Uninstall / Rollback

To undo changes:

1. Restore your backed-up .gitconfig file:

   ls ~/.gitconfig.backup.*
   mv ~/.gitconfig.backup.<timestamp> ~/.gitconfig

2. Optionally remove profile files:

   rm ~/.gitconfig-work
   rm ~/.gitconfig-personal

No other cleanup is required.

FAQ

Does this tool switch Git identity dynamically?

No.

This tool configures Git’s native includeIf rules once.
Git itself handles identity resolution after setup.

The tool does not run during commits.

Can I use this on a company laptop?

Yes.

The tool does not:

• Run in the background
• Modify SSH keys
• Modify GitHub settings
• Intercept Git commands

It performs a one-time configuration using standard Git features.

Does this affect existing repositories?

Only repositories inside the directories you configure are affected.

All other repositories continue using your existing Git configuration.

Can I use more than two profiles?

Not in v1.

v1 intentionally supports only two profiles (work and personal).
Support for additional profiles may be considered later.

Is Windows supported?

Yes, on a best-effort basis.

The tool works anywhere Git and Node.js are available.
Some environments (e.g. locked-down corporate Windows machines) may require Git Bash or WSL.

License

MIT