"""
Genera python_env.sig — hash dei package in site-packages.
Chiamato da deploy_DEV_LOCAL.bat dopo robocopy.
Usage: python _gen_env_sig.py <server_root>
"""
import hashlib
import sys
from pathlib import Path

server = Path(sys.argv[1]) if len(sys.argv) > 1 else Path(r"I:\SOFTWARE\PYTHON_SRV\PYTHON_LOCAL\MyICR_Suite")
d = server / "python" / "Lib" / "site-packages"
if not d.exists():
    print(f"[ERRORE] site-packages non trovato: {d}")
    sys.exit(1)

names = sorted(p.name for p in d.iterdir())
sig = hashlib.md5("\n".join(names).encode()).hexdigest()
out = server / "python_env.sig"
out.write_text(sig, encoding="utf-8")
print(f"python_env.sig: {sig}  ({len(names)} package)")