1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
|
#!/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, os, subprocess, 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))
|
