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#!/usr/bin/env python
# This code runs compatibly under Python 2 and 3.x for x >= 2.
# Preserve this property!
from __future__ import absolute_import, print_function, division
import glob
import os
import subprocess
import sys
GPS_LIB_NAME = 'gps'
BINARY_ENCODING = 'latin-1'
if bytes is str:
polystr = str
else: # Otherwise we do something real
def polystr(o):
"Convert bytes or str to str with proper encoding."
if isinstance(o, str):
return o
if isinstance(o, bytes):
return str(o, encoding=BINARY_ENCODING)
raise ValueError
def DoCommand(cmd_list):
"Perform external command, returning exit code and stdout."
pipe = subprocess.PIPE
proc = subprocess.Popen(cmd_list, stdin=pipe, stdout=pipe)
result, _ = proc.communicate()
return proc.returncode, polystr(result)
class PythonCommand(object):
"Object for one system Python command."
PYTHON_GLOB = 'python*'
TEXT_PREFIX = b'#!'
PATH_ENV = 'PATH'
PATH_ENV_SEP = ':'
PYTHON_EXE_COMMANDS = [
'import sys',
'print(sys.executable)',
]
instances = []
def __init__(self, command):
"Set up PythonCommand."
self.command = command
@classmethod
def FindPythons(cls, dir):
"Create PythonCommand objects by scanning directory."
pattern = dir + os.path.sep + cls.PYTHON_GLOB
pythons = glob.glob(pattern)
for python in pythons:
with open(python, 'rb') as f:
if f.read(2) == cls.TEXT_PREFIX:
continue
cls.instances.append(cls(python))
return cls.instances
@classmethod
def FindAllPythons(cls):
"Create PythonCommand objects by scanning command PATH."
paths = os.getenv(cls.PATH_ENV)
for dir in paths.split(cls.PATH_ENV_SEP):
cls.FindPythons(dir)
return cls.instances
def GetExecutable(self):
"Obtain executable path from this Python."
command = [self.command, '-c', ';'.join(self.PYTHON_EXE_COMMANDS)]
status, result = DoCommand(command)
if status:
return None
return result.strip()
class PythonExecutable(object):
"Object for one Python executable, deduped."
PYTHON_LIBDIR_COMMANDS = [
'from distutils import sysconfig',
'print(sysconfig.get_python_lib())',
]
_by_path = {}
def __new__(cls, command):
"Create or update one PythonExecutable from PythonCommand."
path = command.GetExecutable()
existing = cls._by_path.get(path)
if existing:
existing.commands.append(command)
return existing
self = super(PythonExecutable, cls).__new__(cls)
self.commands = [command]
self.path = path
self.libdir = None
cls._by_path[path] = self
return self
def __lt__(self, other):
"Allow sorting."
return self.path < other.path
@classmethod
def GetAllExecutables(cls, command_list):
"Build list of executables from list of commands."
for command in command_list:
cls(command)
return sorted(cls._by_path.values())
def GetLibdir(self):
"Obtain libdir path from this Python."
if self.libdir:
return self.libdir
command = [self.path, '-c', ';'.join(self.PYTHON_LIBDIR_COMMANDS)]
status, result = DoCommand(command)
if status:
return None
return result.strip()
def CleanLib(self, name):
"Clean up given package from this Python."
dir = os.path.join(self.GetLibdir(), name)
if not name or not os.path.exists(dir):
return
try:
os.rmdir(dir)
except OSError:
print('Unable to remove %s' % dir)
else:
print('Removed empty %s' % dir)
@classmethod
def CleanAllLibs(cls, name):
"Clean up given package from all executables."
for exe in cls._by_path.values():
exe.CleanLib(name)
def main(argv):
"Main function."
commands = PythonCommand.FindAllPythons()
PythonExecutable.GetAllExecutables(commands)
PythonExecutable.CleanAllLibs(GPS_LIB_NAME)
return 0
if __name__ == '__main__':
sys.exit(main(sys.argv))
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