Using Git Worktrees

Using Git Worktrees

Required Tools

Cross-Platform Notes:

• macOS: Install GNU coreutils for timeout command: brew install coreutils (provides gtimeout)
• Linux/WSL: timeout command is available by default

Cross-Platform Helper Functions

Add these functions to your shell session for cross-platform compatibility:

# Cross-platform timeout wrapper
run_with_timeout() {
  local seconds="$1"
  shift
  if command -v timeout >/dev/null 2>&1; then
    timeout "$seconds" "$@"
  elif command -v gtimeout >/dev/null 2>&1; then
    gtimeout "$seconds" "$@"
  else
    # Perl fallback for macOS without coreutils
    perl -e 'use POSIX qw(SIGALRM); alarm shift; exec @ARGV or die "$!"' "$seconds" "$@"
  fi
}

# Cross-platform grep wrapper  
search_text() {
  if command -v rg >/dev/null 2>&1; then
    rg "$@"
  else
    grep -E "$@"
  fi
}

# Cross-platform PIPESTATUS alternative
# Usage: run_and_capture command arg1 arg2; EXIT_CODE=$?
run_and_capture() {
  "$@"
  return $?
}

Tool Execution Protocol

if [ $EXIT_CODE -eq 0 ]; then echo "SUCCESS: Worktree created at $WORKTREE_PATH" elif search_text -q "already exists" worktree_creation.log; then echo "INFO: Worktree branch already exists, removing old worktree" git worktree remove "$WORKTREE_PATH" 2>/dev/null # Retry creation git worktree add "$WORKTREE_PATH" -b "$BRANCH_NAME" else echo "TOOL_FAILURE: Failed to create worktree" echo "Diagnosis: $(cat worktree_creation.log)" echo "" echo "Possible causes:" echo "- Branch name already exists elsewhere" echo "- Filesystem permissions" echo "- Corrupted git repository" exit 1 fi

4. **Safety verification with retry**
```bash
# Check .gitignore with retry
if ! git check-ignore -q .worktrees 2>/dev/null; then
  echo "WARNING: .worktrees is NOT ignored in .gitignore"
  echo "Fixing immediately..."

  # Add to .gitignore
  echo ".worktrees/" >> .gitignore 2>/dev/null

  # Verify fix
  if git check-ignore -q .worktrees 2>/dev/null; then
    echo "SUCCESS: .worktrees now ignored"
    # Stage and commit
    git add .gitignore
    git commit -m "chore: add .worktrees to .gitignore"
  else
    echo "TOOL_FAILURE: Could not add .worktrees to .gitignore"
    echo "Manual intervention required"
  fi
fi

5. Baseline verification with error checks

   # Run project setup with validation
   cd "$WORKTREE_PATH"
   
   # Detect project type
   if [ -f package.json ]; then
     echo "Detected: Node.js project"
     echo "Running: npm install"
   
     run_with_timeout 120 npm install 2>&1 | tee npm_install.log
     if [ $? -eq 0 ]; then
       echo "SUCCESS: Dependencies installed"
     else
       echo "WARNING: npm install had issues"
       echo "Check: npm_install.log"
     fi
   elif [ -f Cargo.toml ]; then
     echo "Detected: Rust project"
     echo "Running: cargo build"
   
     run_with_timeout 300 cargo build 2>&1 | tee cargo_build.log
     if [ $? -eq 0 ]; then
       echo "SUCCESS: Project built successfully"
     else
       echo "WARNING: Build had errors or warnings"
       echo "Check: cargo_build.log"
     fi
   else
     echo "INFO: No package manager detected (manual project)"
   fi
   
   # Verify clean baseline
   if [ -f package.json ]; then
     run_with_timeout 60 npm test 2>&1 | tee npm_test.log
     if [ $? -eq 0 ]; then
       echo "BASELINE: All tests passing"
     else
       echo "WARNING: Baseline tests not passing"
       echo "This may not be a clean checkout"
     fi
   fi
   

Overview

Git worktrees create isolated workspaces sharing the same repository, allowing work on multiple engagements or exploit branches simultaneously without switching.

Core principle: Systematic directory selection + safety verification = reliable isolation.

Announce at start: "I'm using the using-git-worktrees skill to set up an isolated workspace."

Directory Selection Process

Follow this priority order:

1. Check Existing Directories

# Check in priority order
ls -d .worktrees 2>/dev/null     # Preferred (hidden)
ls -d worktrees 2>/dev/null      # Alternative

If found: Use that directory. If both exist, .worktrees wins.

2. Check CLAUDE.md

rg -i "worktree.*director" CLAUDE.md 2>/dev/null

If preference specified: Use it without asking.

3. Ask User

If no directory exists and no CLAUDE.md preference:

No worktree directory found. Where should I create worktrees?

1. .worktrees/ (project-local, hidden)
2. ~/.config/superhackers/worktrees/<project-name>/ (global location)

Which would you prefer?

Safety Verification

For Project-Local Directories (.worktrees or worktrees)

MUST verify directory is ignored before creating worktree:

# Check if directory is ignored (respects local, global, and system gitignore)
git check-ignore -q .worktrees 2>/dev/null || git check-ignore -q worktrees 2>/dev/null

If NOT ignored:

Fix broken things immediately:

1. Add appropriate line to .gitignore
2. Commit the change
3. Proceed with worktree creation

Why critical: Prevents accidentally committing worktree contents (especially exploit code, scan results, or engagement evidence) to the repository.

For Global Directory (~/.config/superhackers/worktrees)

No .gitignore verification needed — outside project entirely.

Creation Steps

1. Detect Project Name

project=$(basename "$(git rev-parse --show-toplevel)")

2. Create Worktree

# Determine full path
case $LOCATION in
  .worktrees|worktrees)
    path="$LOCATION/$BRANCH_NAME"
    ;;
  ~/.config/superhackers/worktrees/*)
    path="~/.config/superhackers/worktrees/$project/$BRANCH_NAME"
    ;;
esac

# Create worktree with new branch
git worktree add "$path" -b "$BRANCH_NAME"
cd "$path"

3. Run Project Setup

Auto-detect and run appropriate setup:

# Node.js
if [ -f package.json ]; then npm install; fi

# Rust
if [ -f Cargo.toml ]; then cargo build; fi

# Python
if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
if [ -f pyproject.toml ]; then poetry install; fi

# Go
if [ -f go.mod ]; then go mod download; fi

4. Verify Clean Baseline

Run scans or checks to ensure worktree starts clean:

# Verify the workspace is functional
# Use project-appropriate verification command
npm test          # Node.js projects
cargo test        # Rust projects
pytest            # Python projects
go test ./...     # Go projects

If checks fail: Report failures, ask whether to proceed or investigate.

If checks pass: Report ready.

5. Report Location

Worktree ready at <full-path>
Baseline checks passing (<N> checks, 0 failures)
Ready to begin <engagement-name / exploit-branch / target-analysis>

Quick Reference

Common Mistakes

Skipping ignore verification

• Problem: Worktree contents (exploit code, credentials, scan data) get tracked, pollute git status, risk exposure
• Fix: Always use git check-ignore before creating project-local worktree

Assuming directory location

• Problem: Creates inconsistency, violates project conventions
• Fix: Follow priority: existing > CLAUDE.md > ask

Proceeding with failing baseline

• Problem: Can't distinguish new issues from pre-existing problems during testing
• Fix: Report failures, get explicit permission to proceed

Hardcoding setup commands

• Problem: Breaks on projects using different tools
• Fix: Auto-detect from project files (package.json, etc.)

Example Workflows

Isolated Exploit Development

You: I'm using the using-git-worktrees skill to set up an isolated workspace.

[Check .worktrees/ - exists]
[Verify ignored - git check-ignore confirms .worktrees/ is ignored]
[Create worktree: git worktree add .worktrees/exploit-cve-2024-1234 -b exploit/cve-2024-1234]
[Run pip install -r requirements.txt]
[Run pytest - 12 passing]

Worktree ready at /Users/hacker/pentest-tools/.worktrees/exploit-cve-2024-1234
Baseline checks passing (12 tests, 0 failures)
Ready to develop exploit for CVE-2024-1234

Parallel Target Analysis

You: I'm using the using-git-worktrees skill to set up isolated workspaces for parallel testing.

[Create worktree: git worktree add .worktrees/target-webapp -b engagement/webapp-assessment]
[Create worktree: git worktree add .worktrees/target-api -b engagement/api-assessment]
[Create worktree: git worktree add .worktrees/target-infra -b engagement/infra-assessment]

Worktrees ready:
  - .worktrees/target-webapp → webapp assessment workspace
  - .worktrees/target-api → API assessment workspace
  - .worktrees/target-infra → infrastructure assessment workspace

Ready to dispatch parallel agents (see superhackers:dispatching-parallel-agents)

Red Flags

Never:

• Create worktree without verifying it's ignored (project-local)
• Skip baseline verification
• Proceed with failing checks without asking
• Assume directory location when ambiguous
• Skip CLAUDE.md check
• Store sensitive engagement data in unignored worktrees

Always:

• Follow directory priority: existing > CLAUDE.md > ask
• Verify directory is ignored for project-local
• Auto-detect and run project setup
• Verify clean baseline
• Consider data sensitivity when choosing worktree location

Integration

Called by:

• superhackers:security-assessment — REQUIRED when setting up engagement workspace
• superhackers:dispatching-parallel-agents — REQUIRED before dispatching agents to isolated workspaces
• Any skill needing isolated workspace for exploit development or testing

Pairs with:

• superhackers:finishing-an-engagement — REQUIRED for cleanup after engagement complete