Pre-Commit Identity Guard Engine

Fail-closed verification interceptor stopping wrong-author commits from hitting your repository history.

While directory-scoped configuration routing acts as an incredibly reliable dynamic baseline, multi-state configuration drift remains a real vulnerability.

If a developer runs manual one-off override commands inside a local project folder (e.g., git config user.email "personal@example.com"), Git’s native precedence engine prioritizes local repository flags over global profile rules. To prevent these localized state overrides from leaking unauthorized identities into public commit history, GitSetu deploys an uncompromising final boundary: the Identity Guard Engine.

Fail-Closed Intercept Flow

During initial installation or execution of the install-guard subcommand, GitSetu maps a high-speed verification interceptor directly into your global Git configuration bounds (core.hooksPath).

[ Developer executes: git commit -m "feat: core module" ]
                           │
                           ▼
          [ Pre-Commit Hook Interception ]
                           │
                           ▼
  [ Rapid lookup of expected profile state for path ]
                           │
                           ▼
  [ Compares expected profile email vs actual email ]
                           │
             ┌─────────────┴─────────────┐
             ▼                           ▼
       [ MATCHES ]                 [ DIVERGES ]
             │                           │
             ▼                           ▼
     [ Commit Succeeds ]       [ INSTANT FATAL ABORT ]

The Terminal Experience

When configuration divergence is intercepted, execution aborts instantly with high-visibility diagnostic output:

$ git commit -m "wip: core patch"
[GitSetu Guard] BLOCKING COMMIT! Identity mismatch detected.
Expected Email: dev@company.com (Target Profile: 'work')
Active Runtime Email: personal@example.com (Source: local .git/config override)

Action Required: Run 'gitsetu doctor' or strip local config overrides.

Ecosystem Virtualization Integration

Deploying global core.hooksPath directives frequently breaks localized team development tooling.

GitSetu’s intercept engine is architected to act as a transparent pass-through proxy. After verifying active identity boundaries successfully, the hook automatically identifies and triggers project-level execution hooks (e.g., husky, lefthook, or pre-commit runners), guaranteeing localized linting and testing pipelines run completely uninhibited.

High-Performance Execution

Because commit validation occurs inline multiple times a day, execution overhead must remain minimal.

The Identity Guard is compiled purely in native, un-subshell-dependent Bash 3.2. By directly scanning internal configuration parameters without spinning up sub-processes or external interpreters, total evaluation completes in < 2 milliseconds, rendering the security verification entirely invisible during normal workflows.

Lifecycle Commands

Supervise the guard deployment natively via targeted subcommands:

# Natively mounts the global validation boundary
gitsetu install-guard

# Disables global interception cleanly
gitsetu remove-guard