151 lines
4.9 KiB
Python
151 lines
4.9 KiB
Python
"""Implement https://www.python.org/dev/peps/pep-0514/ to discover interpreters - Windows only"""
|
|
|
|
import os
|
|
import re
|
|
import winreg
|
|
from logging import basicConfig, getLogger
|
|
|
|
LOGGER = getLogger(__name__)
|
|
|
|
|
|
def enum_keys(key):
|
|
at = 0
|
|
while True:
|
|
try:
|
|
yield winreg.EnumKey(key, at)
|
|
except OSError:
|
|
break
|
|
at += 1
|
|
|
|
|
|
def get_value(key, value_name):
|
|
try:
|
|
return winreg.QueryValueEx(key, value_name)[0]
|
|
except OSError:
|
|
return None
|
|
|
|
|
|
def discover_pythons():
|
|
for hive, hive_name, key, flags, default_arch in [
|
|
(winreg.HKEY_CURRENT_USER, "HKEY_CURRENT_USER", r"Software\Python", 0, 64),
|
|
(winreg.HKEY_LOCAL_MACHINE, "HKEY_LOCAL_MACHINE", r"Software\Python", winreg.KEY_WOW64_64KEY, 64),
|
|
(winreg.HKEY_LOCAL_MACHINE, "HKEY_LOCAL_MACHINE", r"Software\Python", winreg.KEY_WOW64_32KEY, 32),
|
|
]:
|
|
yield from process_set(hive, hive_name, key, flags, default_arch)
|
|
|
|
|
|
def process_set(hive, hive_name, key, flags, default_arch):
|
|
try:
|
|
with winreg.OpenKeyEx(hive, key, 0, winreg.KEY_READ | flags) as root_key:
|
|
for company in enum_keys(root_key):
|
|
if company == "PyLauncher": # reserved
|
|
continue
|
|
yield from process_company(hive_name, company, root_key, default_arch)
|
|
except OSError:
|
|
pass
|
|
|
|
|
|
def process_company(hive_name, company, root_key, default_arch):
|
|
with winreg.OpenKeyEx(root_key, company) as company_key:
|
|
for tag in enum_keys(company_key):
|
|
spec = process_tag(hive_name, company, company_key, tag, default_arch)
|
|
if spec is not None:
|
|
yield spec
|
|
|
|
|
|
def process_tag(hive_name, company, company_key, tag, default_arch):
|
|
with winreg.OpenKeyEx(company_key, tag) as tag_key:
|
|
version = load_version_data(hive_name, company, tag, tag_key)
|
|
if version is not None: # if failed to get version bail
|
|
major, minor, _ = version
|
|
arch = load_arch_data(hive_name, company, tag, tag_key, default_arch)
|
|
if arch is not None:
|
|
exe_data = load_exe(hive_name, company, company_key, tag)
|
|
if exe_data is not None:
|
|
exe, args = exe_data
|
|
return company, major, minor, arch, exe, args
|
|
|
|
|
|
def load_exe(hive_name, company, company_key, tag):
|
|
key_path = f"{hive_name}/{company}/{tag}"
|
|
try:
|
|
with winreg.OpenKeyEx(company_key, rf"{tag}\InstallPath") as ip_key:
|
|
with ip_key:
|
|
exe = get_value(ip_key, "ExecutablePath")
|
|
if exe is None:
|
|
ip = get_value(ip_key, None)
|
|
if ip is None:
|
|
msg(key_path, "no ExecutablePath or default for it")
|
|
|
|
else:
|
|
exe = os.path.join(ip, "python.exe")
|
|
if exe is not None and os.path.exists(exe):
|
|
args = get_value(ip_key, "ExecutableArguments")
|
|
return exe, args
|
|
else:
|
|
msg(key_path, f"could not load exe with value {exe}")
|
|
except OSError:
|
|
msg(f"{key_path}/InstallPath", "missing")
|
|
return None
|
|
|
|
|
|
def load_arch_data(hive_name, company, tag, tag_key, default_arch):
|
|
arch_str = get_value(tag_key, "SysArchitecture")
|
|
if arch_str is not None:
|
|
key_path = f"{hive_name}/{company}/{tag}/SysArchitecture"
|
|
try:
|
|
return parse_arch(arch_str)
|
|
except ValueError as sys_arch:
|
|
msg(key_path, sys_arch)
|
|
return default_arch
|
|
|
|
|
|
def parse_arch(arch_str):
|
|
if isinstance(arch_str, str):
|
|
match = re.match(r"^(\d+)bit$", arch_str)
|
|
if match:
|
|
return int(next(iter(match.groups())))
|
|
error = f"invalid format {arch_str}"
|
|
else:
|
|
error = f"arch is not string: {repr(arch_str)}"
|
|
raise ValueError(error)
|
|
|
|
|
|
def load_version_data(hive_name, company, tag, tag_key):
|
|
for candidate, key_path in [
|
|
(get_value(tag_key, "SysVersion"), f"{hive_name}/{company}/{tag}/SysVersion"),
|
|
(tag, f"{hive_name}/{company}/{tag}"),
|
|
]:
|
|
if candidate is not None:
|
|
try:
|
|
return parse_version(candidate)
|
|
except ValueError as sys_version:
|
|
msg(key_path, sys_version)
|
|
return None
|
|
|
|
|
|
def parse_version(version_str):
|
|
if isinstance(version_str, str):
|
|
match = re.match(r"^(\d+)(?:\.(\d+))?(?:\.(\d+))?$", version_str)
|
|
if match:
|
|
return tuple(int(i) if i is not None else None for i in match.groups())
|
|
error = f"invalid format {version_str}"
|
|
else:
|
|
error = f"version is not string: {version_str!r}"
|
|
raise ValueError(error)
|
|
|
|
|
|
def msg(path, what):
|
|
LOGGER.warning(f"PEP-514 violation in Windows Registry at {path} error: {what}")
|
|
|
|
|
|
def _run():
|
|
basicConfig()
|
|
interpreters = []
|
|
for spec in discover_pythons():
|
|
interpreters.append(repr(spec))
|
|
print("\n".join(sorted(interpreters)))
|
|
|
|
|
|
if __name__ == "__main__":
|
|
_run()
|