feat: Windows support via Git Bash

[nmhjklnm]

Summary

Full Windows support for cac. Claude Code on Windows requires Git for Windows, so Git Bash (MINGW64) is always available.

Approach

Adapt the existing bash cac script to work in Git Bash, rather than rewriting in PowerShell or Node.js.

Core changes needed

Item	Problem	Solution
/dev/tcp	Not available in MINGW bash	_tcp_check() helper using node -e "require('net').connect(...)"
python3	May not exist on Windows	Replace with node -e (guaranteed available)
Wrapper	Need claude.cmd not bash	_write_wrapper generates claude.cmd on Windows
Shims	ioreg/ifconfig/cat shims not needed	Skip on Windows — fingerprint-hook.js handles everything
RC files	No .bashrc in native context	Write to Git Bash ~/.bashrc + set Windows system PATH via registry
Platform	_detect_platform returns unsupported	Add win32-x64 support
openssl	Not default on Windows	Git for Windows bundles OpenSSL

What already works cross-platform

• fingerprint-hook.js — already has Windows wmic/reg interception
• cac-dns-guard.js — pure Node.js, fully cross-platform
• relay.js — pure Node.js
• NODE_OPTIONS --require / BUN_OPTIONS --preload — cross-platform

Testing

Need a Windows machine or VM with:

• Git for Windows installed
• Claude Code installed (irm https://claude.ai/install.ps1 | iex)
• npm available

Files to modify

• src/utils.sh — _tcp_check(), _detect_platform, _write_path_to_rc
• src/templates.sh — _write_wrapper Windows branch, skip shims
• src/cmd_setup.sh — _ensure_initialized Windows branch
• src/cmd_claude.sh — Windows binary download support
• package.json — bin field for Windows

References

• Existing (outdated) cac.ps1 and cac.cmd can be used as reference
• Claude Code Windows install docs

[Anankke]

Any updates on this?

[nmhjklnm]

Closing as no longer planned.