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comparison: python/virtualenv/virtualenv_embedded/site.py

python/virtualenv/virtualenv_embedded/site.py

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1 """Append module search paths for third-party packages to sys.path.
2
3 ****************************************************************
4 * This module is automatically imported during initialization. *
5 ****************************************************************
6
7 In earlier versions of Python (up to 1.5a3), scripts or modules that
8 needed to use site-specific modules would place ``import site''
9 somewhere near the top of their code. Because of the automatic
10 import, this is no longer necessary (but code that does it still
11 works).
12
13 This will append site-specific paths to the module search path. On
14 Unix, it starts with sys.prefix and sys.exec_prefix (if different) and
15 appends lib/python<version>/site-packages as well as lib/site-python.
16 It also supports the Debian convention of
17 lib/python<version>/dist-packages. On other platforms (mainly Mac and
18 Windows), it uses just sys.prefix (and sys.exec_prefix, if different,
19 but this is unlikely). The resulting directories, if they exist, are
20 appended to sys.path, and also inspected for path configuration files.
21
22 FOR DEBIAN, this sys.path is augmented with directories in /usr/local.
23 Local addons go into /usr/local/lib/python<version>/site-packages
24 (resp. /usr/local/lib/site-python), Debian addons install into
25 /usr/{lib,share}/python<version>/dist-packages.
26
27 A path configuration file is a file whose name has the form
28 <package>.pth; its contents are additional directories (one per line)
29 to be added to sys.path. Non-existing directories (or
30 non-directories) are never added to sys.path; no directory is added to
31 sys.path more than once. Blank lines and lines beginning with
32 '#' are skipped. Lines starting with 'import' are executed.
33
34 For example, suppose sys.prefix and sys.exec_prefix are set to
35 /usr/local and there is a directory /usr/local/lib/python2.X/site-packages
36 with three subdirectories, foo, bar and spam, and two path
37 configuration files, foo.pth and bar.pth. Assume foo.pth contains the
38 following:
39
40 # foo package configuration
41 foo
42 bar
43 bletch
44
45 and bar.pth contains:
46
47 # bar package configuration
48 bar
49
50 Then the following directories are added to sys.path, in this order:
51
52 /usr/local/lib/python2.X/site-packages/bar
53 /usr/local/lib/python2.X/site-packages/foo
54
55 Note that bletch is omitted because it doesn't exist; bar precedes foo
56 because bar.pth comes alphabetically before foo.pth; and spam is
57 omitted because it is not mentioned in either path configuration file.
58
59 After these path manipulations, an attempt is made to import a module
60 named sitecustomize, which can perform arbitrary additional
61 site-specific customizations. If this import fails with an
62 ImportError exception, it is silently ignored.
63
64 """
65
66 import sys
67 import os
68 try:
69 import __builtin__ as builtins
70 except ImportError:
71 import builtins
72 try:
73 set
74 except NameError:
75 from sets import Set as set
76
77 # Prefixes for site-packages; add additional prefixes like /usr/local here
78 PREFIXES = [sys.prefix, sys.exec_prefix]
79 # Enable per user site-packages directory
80 # set it to False to disable the feature or True to force the feature
81 ENABLE_USER_SITE = None
82 # for distutils.commands.install
83 USER_SITE = None
84 USER_BASE = None
85
86 _is_64bit = (getattr(sys, 'maxsize', None) or getattr(sys, 'maxint')) > 2**32
87 _is_pypy = hasattr(sys, 'pypy_version_info')
88 _is_jython = sys.platform[:4] == 'java'
89 if _is_jython:
90 ModuleType = type(os)
91
92 def makepath(*paths):
93 dir = os.path.join(*paths)
94 if _is_jython and (dir == '__classpath__' or
95 dir.startswith('__pyclasspath__')):
96 return dir, dir
97 dir = os.path.abspath(dir)
98 return dir, os.path.normcase(dir)
99
100 def abs__file__():
101 """Set all module' __file__ attribute to an absolute path"""
102 for m in sys.modules.values():
103 if ((_is_jython and not isinstance(m, ModuleType)) or
104 hasattr(m, '__loader__')):
105 # only modules need the abspath in Jython. and don't mess
106 # with a PEP 302-supplied __file__
107 continue
108 f = getattr(m, '__file__', None)
109 if f is None:
110 continue
111 m.__file__ = os.path.abspath(f)
112
113 def removeduppaths():
114 """ Remove duplicate entries from sys.path along with making them
115 absolute"""
116 # This ensures that the initial path provided by the interpreter contains
117 # only absolute pathnames, even if we're running from the build directory.
118 L = []
119 known_paths = set()
120 for dir in sys.path:
121 # Filter out duplicate paths (on case-insensitive file systems also
122 # if they only differ in case); turn relative paths into absolute
123 # paths.
124 dir, dircase = makepath(dir)
125 if not dircase in known_paths:
126 L.append(dir)
127 known_paths.add(dircase)
128 sys.path[:] = L
129 return known_paths
130
131 # XXX This should not be part of site.py, since it is needed even when
132 # using the -S option for Python. See http://www.python.org/sf/586680
133 def addbuilddir():
134 """Append ./build/lib.<platform> in case we're running in the build dir
135 (especially for Guido :-)"""
136 from distutils.util import get_platform
137 s = "build/lib.%s-%.3s" % (get_platform(), sys.version)
138 if hasattr(sys, 'gettotalrefcount'):
139 s += '-pydebug'
140 s = os.path.join(os.path.dirname(sys.path[-1]), s)
141 sys.path.append(s)
142
143 def _init_pathinfo():
144 """Return a set containing all existing directory entries from sys.path"""
145 d = set()
146 for dir in sys.path:
147 try:
148 if os.path.isdir(dir):
149 dir, dircase = makepath(dir)
150 d.add(dircase)
151 except TypeError:
152 continue
153 return d
154
155 def addpackage(sitedir, name, known_paths):
156 """Add a new path to known_paths by combining sitedir and 'name' or execute
157 sitedir if it starts with 'import'"""
158 if known_paths is None:
159 _init_pathinfo()
160 reset = 1
161 else:
162 reset = 0
163 fullname = os.path.join(sitedir, name)
164 try:
165 f = open(fullname, "rU")
166 except IOError:
167 return
168 try:
169 for line in f:
170 if line.startswith("#"):
171 continue
172 if line.startswith("import"):
173 exec(line)
174 continue
175 line = line.rstrip()
176 dir, dircase = makepath(sitedir, line)
177 if not dircase in known_paths and os.path.exists(dir):
178 sys.path.append(dir)
179 known_paths.add(dircase)
180 finally:
181 f.close()
182 if reset:
183 known_paths = None
184 return known_paths
185
186 def addsitedir(sitedir, known_paths=None):
187 """Add 'sitedir' argument to sys.path if missing and handle .pth files in
188 'sitedir'"""
189 if known_paths is None:
190 known_paths = _init_pathinfo()
191 reset = 1
192 else:
193 reset = 0
194 sitedir, sitedircase = makepath(sitedir)
195 if not sitedircase in known_paths:
196 sys.path.append(sitedir) # Add path component
197 try:
198 names = os.listdir(sitedir)
199 except os.error:
200 return
201 names.sort()
202 for name in names:
203 if name.endswith(os.extsep + "pth"):
204 addpackage(sitedir, name, known_paths)
205 if reset:
206 known_paths = None
207 return known_paths
208
209 def addsitepackages(known_paths, sys_prefix=sys.prefix, exec_prefix=sys.exec_prefix):
210 """Add site-packages (and possibly site-python) to sys.path"""
211 prefixes = [os.path.join(sys_prefix, "local"), sys_prefix]
212 if exec_prefix != sys_prefix:
213 prefixes.append(os.path.join(exec_prefix, "local"))
214
215 for prefix in prefixes:
216 if prefix:
217 if sys.platform in ('os2emx', 'riscos') or _is_jython:
218 sitedirs = [os.path.join(prefix, "Lib", "site-packages")]
219 elif _is_pypy:
220 sitedirs = [os.path.join(prefix, 'site-packages')]
221 elif sys.platform == 'darwin' and prefix == sys_prefix:
222
223 if prefix.startswith("/System/Library/Frameworks/"): # Apple's Python
224
225 sitedirs = [os.path.join("/Library/Python", sys.version[:3], "site-packages"),
226 os.path.join(prefix, "Extras", "lib", "python")]
227
228 else: # any other Python distros on OSX work this way
229 sitedirs = [os.path.join(prefix, "lib",
230 "python" + sys.version[:3], "site-packages")]
231
232 elif os.sep == '/':
233 sitedirs = [os.path.join(prefix,
234 "lib",
235 "python" + sys.version[:3],
236 "site-packages"),
237 os.path.join(prefix, "lib", "site-python"),
238 os.path.join(prefix, "python" + sys.version[:3], "lib-dynload")]
239 lib64_dir = os.path.join(prefix, "lib64", "python" + sys.version[:3], "site-packages")
240 if (os.path.exists(lib64_dir) and
241 os.path.realpath(lib64_dir) not in [os.path.realpath(p) for p in sitedirs]):
242 if _is_64bit:
243 sitedirs.insert(0, lib64_dir)
244 else:
245 sitedirs.append(lib64_dir)
246 try:
247 # sys.getobjects only available in --with-pydebug build
248 sys.getobjects
249 sitedirs.insert(0, os.path.join(sitedirs[0], 'debug'))
250 except AttributeError:
251 pass
252 # Debian-specific dist-packages directories:
253 if sys.version[0] == '2':
254 sitedirs.append(os.path.join(prefix, "lib",
255 "python" + sys.version[:3],
256 "dist-packages"))
257 else:
258 sitedirs.append(os.path.join(prefix, "lib",
259 "python" + sys.version[0],
260 "dist-packages"))
261 sitedirs.append(os.path.join(prefix, "local/lib",
262 "python" + sys.version[:3],
263 "dist-packages"))
264 sitedirs.append(os.path.join(prefix, "lib", "dist-python"))
265 else:
266 sitedirs = [prefix, os.path.join(prefix, "lib", "site-packages")]
267 if sys.platform == 'darwin':
268 # for framework builds *only* we add the standard Apple
269 # locations. Currently only per-user, but /Library and
270 # /Network/Library could be added too
271 if 'Python.framework' in prefix:
272 home = os.environ.get('HOME')
273 if home:
274 sitedirs.append(
275 os.path.join(home,
276 'Library',
277 'Python',
278 sys.version[:3],
279 'site-packages'))
280 for sitedir in sitedirs:
281 if os.path.isdir(sitedir):
282 addsitedir(sitedir, known_paths)
283 return None
284
285 def check_enableusersite():
286 """Check if user site directory is safe for inclusion
287
288 The function tests for the command line flag (including environment var),
289 process uid/gid equal to effective uid/gid.
290
291 None: Disabled for security reasons
292 False: Disabled by user (command line option)
293 True: Safe and enabled
294 """
295 if hasattr(sys, 'flags') and getattr(sys.flags, 'no_user_site', False):
296 return False
297
298 if hasattr(os, "getuid") and hasattr(os, "geteuid"):
299 # check process uid == effective uid
300 if os.geteuid() != os.getuid():
301 return None
302 if hasattr(os, "getgid") and hasattr(os, "getegid"):
303 # check process gid == effective gid
304 if os.getegid() != os.getgid():
305 return None
306
307 return True
308
309 def addusersitepackages(known_paths):
310 """Add a per user site-package to sys.path
311
312 Each user has its own python directory with site-packages in the
313 home directory.
314
315 USER_BASE is the root directory for all Python versions
316
317 USER_SITE is the user specific site-packages directory
318
319 USER_SITE/.. can be used for data.
320 """
321 global USER_BASE, USER_SITE, ENABLE_USER_SITE
322 env_base = os.environ.get("PYTHONUSERBASE", None)
323
324 def joinuser(*args):
325 return os.path.expanduser(os.path.join(*args))
326
327 #if sys.platform in ('os2emx', 'riscos'):
328 # # Don't know what to put here
329 # USER_BASE = ''
330 # USER_SITE = ''
331 if os.name == "nt":
332 base = os.environ.get("APPDATA") or "~"
333 if env_base:
334 USER_BASE = env_base
335 else:
336 USER_BASE = joinuser(base, "Python")
337 USER_SITE = os.path.join(USER_BASE,
338 "Python" + sys.version[0] + sys.version[2],
339 "site-packages")
340 else:
341 if env_base:
342 USER_BASE = env_base
343 else:
344 USER_BASE = joinuser("~", ".local")
345 USER_SITE = os.path.join(USER_BASE, "lib",
346 "python" + sys.version[:3],
347 "site-packages")
348
349 if ENABLE_USER_SITE and os.path.isdir(USER_SITE):
350 addsitedir(USER_SITE, known_paths)
351 if ENABLE_USER_SITE:
352 for dist_libdir in ("lib", "local/lib"):
353 user_site = os.path.join(USER_BASE, dist_libdir,
354 "python" + sys.version[:3],
355 "dist-packages")
356 if os.path.isdir(user_site):
357 addsitedir(user_site, known_paths)
358 return known_paths
359
360
361
362 def setBEGINLIBPATH():
363 """The OS/2 EMX port has optional extension modules that do double duty
364 as DLLs (and must use the .DLL file extension) for other extensions.
365 The library search path needs to be amended so these will be found
366 during module import. Use BEGINLIBPATH so that these are at the start
367 of the library search path.
368
369 """
370 dllpath = os.path.join(sys.prefix, "Lib", "lib-dynload")
371 libpath = os.environ['BEGINLIBPATH'].split(';')
372 if libpath[-1]:
373 libpath.append(dllpath)
374 else:
375 libpath[-1] = dllpath
376 os.environ['BEGINLIBPATH'] = ';'.join(libpath)
377
378
379 def setquit():
380 """Define new built-ins 'quit' and 'exit'.
381 These are simply strings that display a hint on how to exit.
382
383 """
384 if os.sep == ':':
385 eof = 'Cmd-Q'
386 elif os.sep == '\\':
387 eof = 'Ctrl-Z plus Return'
388 else:
389 eof = 'Ctrl-D (i.e. EOF)'
390
391 class Quitter(object):
392 def __init__(self, name):
393 self.name = name
394 def __repr__(self):
395 return 'Use %s() or %s to exit' % (self.name, eof)
396 def __call__(self, code=None):
397 # Shells like IDLE catch the SystemExit, but listen when their
398 # stdin wrapper is closed.
399 try:
400 sys.stdin.close()
401 except:
402 pass
403 raise SystemExit(code)
404 builtins.quit = Quitter('quit')
405 builtins.exit = Quitter('exit')
406
407
408 class _Printer(object):
409 """interactive prompt objects for printing the license text, a list of
410 contributors and the copyright notice."""
411
412 MAXLINES = 23
413
414 def __init__(self, name, data, files=(), dirs=()):
415 self.__name = name
416 self.__data = data
417 self.__files = files
418 self.__dirs = dirs
419 self.__lines = None
420
421 def __setup(self):
422 if self.__lines:
423 return
424 data = None
425 for dir in self.__dirs:
426 for filename in self.__files:
427 filename = os.path.join(dir, filename)
428 try:
429 fp = open(filename, "rU")
430 data = fp.read()
431 fp.close()
432 break
433 except IOError:
434 pass
435 if data:
436 break
437 if not data:
438 data = self.__data
439 self.__lines = data.split('\n')
440 self.__linecnt = len(self.__lines)
441
442 def __repr__(self):
443 self.__setup()
444 if len(self.__lines) <= self.MAXLINES:
445 return "\n".join(self.__lines)
446 else:
447 return "Type %s() to see the full %s text" % ((self.__name,)*2)
448
449 def __call__(self):
450 self.__setup()
451 prompt = 'Hit Return for more, or q (and Return) to quit: '
452 lineno = 0
453 while 1:
454 try:
455 for i in range(lineno, lineno + self.MAXLINES):
456 print(self.__lines[i])
457 except IndexError:
458 break
459 else:
460 lineno += self.MAXLINES
461 key = None
462 while key is None:
463 try:
464 key = raw_input(prompt)
465 except NameError:
466 key = input(prompt)
467 if key not in ('', 'q'):
468 key = None
469 if key == 'q':
470 break
471
472 def setcopyright():
473 """Set 'copyright' and 'credits' in __builtin__"""
474 builtins.copyright = _Printer("copyright", sys.copyright)
475 if _is_jython:
476 builtins.credits = _Printer(
477 "credits",
478 "Jython is maintained by the Jython developers (www.jython.org).")
479 elif _is_pypy:
480 builtins.credits = _Printer(
481 "credits",
482 "PyPy is maintained by the PyPy developers: http://pypy.org/")
483 else:
484 builtins.credits = _Printer("credits", """\
485 Thanks to CWI, CNRI, BeOpen.com, Zope Corporation and a cast of thousands
486 for supporting Python development. See www.python.org for more information.""")
487 here = os.path.dirname(os.__file__)
488 builtins.license = _Printer(
489 "license", "See http://www.python.org/%.3s/license.html" % sys.version,
490 ["LICENSE.txt", "LICENSE"],
491 [os.path.join(here, os.pardir), here, os.curdir])
492
493
494 class _Helper(object):
495 """Define the built-in 'help'.
496 This is a wrapper around pydoc.help (with a twist).
497
498 """
499
500 def __repr__(self):
501 return "Type help() for interactive help, " \
502 "or help(object) for help about object."
503 def __call__(self, *args, **kwds):
504 import pydoc
505 return pydoc.help(*args, **kwds)
506
507 def sethelper():
508 builtins.help = _Helper()
509
510 def aliasmbcs():
511 """On Windows, some default encodings are not provided by Python,
512 while they are always available as "mbcs" in each locale. Make
513 them usable by aliasing to "mbcs" in such a case."""
514 if sys.platform == 'win32':
515 import locale, codecs
516 enc = locale.getdefaultlocale()[1]
517 if enc.startswith('cp'): # "cp***" ?
518 try:
519 codecs.lookup(enc)
520 except LookupError:
521 import encodings
522 encodings._cache[enc] = encodings._unknown
523 encodings.aliases.aliases[enc] = 'mbcs'
524
525 def setencoding():
526 """Set the string encoding used by the Unicode implementation. The
527 default is 'ascii', but if you're willing to experiment, you can
528 change this."""
529 encoding = "ascii" # Default value set by _PyUnicode_Init()
530 if 0:
531 # Enable to support locale aware default string encodings.
532 import locale
533 loc = locale.getdefaultlocale()
534 if loc[1]:
535 encoding = loc[1]
536 if 0:
537 # Enable to switch off string to Unicode coercion and implicit
538 # Unicode to string conversion.
539 encoding = "undefined"
540 if encoding != "ascii":
541 # On Non-Unicode builds this will raise an AttributeError...
542 sys.setdefaultencoding(encoding) # Needs Python Unicode build !
543
544
545 def execsitecustomize():
546 """Run custom site specific code, if available."""
547 try:
548 import sitecustomize
549 except ImportError:
550 pass
551
552 def virtual_install_main_packages():
553 f = open(os.path.join(os.path.dirname(__file__), 'orig-prefix.txt'))
554 sys.real_prefix = f.read().strip()
555 f.close()
556 pos = 2
557 hardcoded_relative_dirs = []
558 if sys.path[0] == '':
559 pos += 1
560 if _is_jython:
561 paths = [os.path.join(sys.real_prefix, 'Lib')]
562 elif _is_pypy:
563 if sys.version_info > (3, 2):
564 cpyver = '%d' % sys.version_info[0]
565 elif sys.pypy_version_info >= (1, 5):
566 cpyver = '%d.%d' % sys.version_info[:2]
567 else:
568 cpyver = '%d.%d.%d' % sys.version_info[:3]
569 paths = [os.path.join(sys.real_prefix, 'lib_pypy'),
570 os.path.join(sys.real_prefix, 'lib-python', cpyver)]
571 if sys.pypy_version_info < (1, 9):
572 paths.insert(1, os.path.join(sys.real_prefix,
573 'lib-python', 'modified-%s' % cpyver))
574 hardcoded_relative_dirs = paths[:] # for the special 'darwin' case below
575 #
576 # This is hardcoded in the Python executable, but relative to sys.prefix:
577 for path in paths[:]:
578 plat_path = os.path.join(path, 'plat-%s' % sys.platform)
579 if os.path.exists(plat_path):
580 paths.append(plat_path)
581 elif sys.platform == 'win32':
582 paths = [os.path.join(sys.real_prefix, 'Lib'), os.path.join(sys.real_prefix, 'DLLs')]
583 else:
584 paths = [os.path.join(sys.real_prefix, 'lib', 'python'+sys.version[:3])]
585 hardcoded_relative_dirs = paths[:] # for the special 'darwin' case below
586 lib64_path = os.path.join(sys.real_prefix, 'lib64', 'python'+sys.version[:3])
587 if os.path.exists(lib64_path):
588 if _is_64bit:
589 paths.insert(0, lib64_path)
590 else:
591 paths.append(lib64_path)
592 # This is hardcoded in the Python executable, but relative to
593 # sys.prefix. Debian change: we need to add the multiarch triplet
594 # here, which is where the real stuff lives. As per PEP 421, in
595 # Python 3.3+, this lives in sys.implementation, while in Python 2.7
596 # it lives in sys.
597 try:
598 arch = getattr(sys, 'implementation', sys)._multiarch
599 except AttributeError:
600 # This is a non-multiarch aware Python. Fallback to the old way.
601 arch = sys.platform
602 plat_path = os.path.join(sys.real_prefix, 'lib',
603 'python'+sys.version[:3],
604 'plat-%s' % arch)
605 if os.path.exists(plat_path):
606 paths.append(plat_path)
607 # This is hardcoded in the Python executable, but
608 # relative to sys.prefix, so we have to fix up:
609 for path in list(paths):
610 tk_dir = os.path.join(path, 'lib-tk')
611 if os.path.exists(tk_dir):
612 paths.append(tk_dir)
613
614 # These are hardcoded in the Apple's Python executable,
615 # but relative to sys.prefix, so we have to fix them up:
616 if sys.platform == 'darwin':
617 hardcoded_paths = [os.path.join(relative_dir, module)
618 for relative_dir in hardcoded_relative_dirs
619 for module in ('plat-darwin', 'plat-mac', 'plat-mac/lib-scriptpackages')]
620
621 for path in hardcoded_paths:
622 if os.path.exists(path):
623 paths.append(path)
624
625 sys.path.extend(paths)
626
627 def force_global_eggs_after_local_site_packages():
628 """
629 Force easy_installed eggs in the global environment to get placed
630 in sys.path after all packages inside the virtualenv. This
631 maintains the "least surprise" result that packages in the
632 virtualenv always mask global packages, never the other way
633 around.
634
635 """
636 egginsert = getattr(sys, '__egginsert', 0)
637 for i, path in enumerate(sys.path):
638 if i > egginsert and path.startswith(sys.prefix):
639 egginsert = i
640 sys.__egginsert = egginsert + 1
641
642 def virtual_addsitepackages(known_paths):
643 force_global_eggs_after_local_site_packages()
644 return addsitepackages(known_paths, sys_prefix=sys.real_prefix)
645
646 def fixclasspath():
647 """Adjust the special classpath sys.path entries for Jython. These
648 entries should follow the base virtualenv lib directories.
649 """
650 paths = []
651 classpaths = []
652 for path in sys.path:
653 if path == '__classpath__' or path.startswith('__pyclasspath__'):
654 classpaths.append(path)
655 else:
656 paths.append(path)
657 sys.path = paths
658 sys.path.extend(classpaths)
659
660 def execusercustomize():
661 """Run custom user specific code, if available."""
662 try:
663 import usercustomize
664 except ImportError:
665 pass
666
667
668 def main():
669 global ENABLE_USER_SITE
670 virtual_install_main_packages()
671 abs__file__()
672 paths_in_sys = removeduppaths()
673 if (os.name == "posix" and sys.path and
674 os.path.basename(sys.path[-1]) == "Modules"):
675 addbuilddir()
676 if _is_jython:
677 fixclasspath()
678 GLOBAL_SITE_PACKAGES = not os.path.exists(os.path.join(os.path.dirname(__file__), 'no-global-site-packages.txt'))
679 if not GLOBAL_SITE_PACKAGES:
680 ENABLE_USER_SITE = False
681 if ENABLE_USER_SITE is None:
682 ENABLE_USER_SITE = check_enableusersite()
683 paths_in_sys = addsitepackages(paths_in_sys)
684 paths_in_sys = addusersitepackages(paths_in_sys)
685 if GLOBAL_SITE_PACKAGES:
686 paths_in_sys = virtual_addsitepackages(paths_in_sys)
687 if sys.platform == 'os2emx':
688 setBEGINLIBPATH()
689 setquit()
690 setcopyright()
691 sethelper()
692 aliasmbcs()
693 setencoding()
694 execsitecustomize()
695 if ENABLE_USER_SITE:
696 execusercustomize()
697 # Remove sys.setdefaultencoding() so that users cannot change the
698 # encoding after initialization. The test for presence is needed when
699 # this module is run as a script, because this code is executed twice.
700 if hasattr(sys, "setdefaultencoding"):
701 del sys.setdefaultencoding
702
703 main()
704
705 def _script():
706 help = """\
707 %s [--user-base] [--user-site]
708
709 Without arguments print some useful information
710 With arguments print the value of USER_BASE and/or USER_SITE separated
711 by '%s'.
712
713 Exit codes with --user-base or --user-site:
714 0 - user site directory is enabled
715 1 - user site directory is disabled by user
716 2 - uses site directory is disabled by super user
717 or for security reasons
718 >2 - unknown error
719 """
720 args = sys.argv[1:]
721 if not args:
722 print("sys.path = [")
723 for dir in sys.path:
724 print(" %r," % (dir,))
725 print("]")
726 def exists(path):
727 if os.path.isdir(path):
728 return "exists"
729 else:
730 return "doesn't exist"
731 print("USER_BASE: %r (%s)" % (USER_BASE, exists(USER_BASE)))
732 print("USER_SITE: %r (%s)" % (USER_SITE, exists(USER_BASE)))
733 print("ENABLE_USER_SITE: %r" % ENABLE_USER_SITE)
734 sys.exit(0)
735
736 buffer = []
737 if '--user-base' in args:
738 buffer.append(USER_BASE)
739 if '--user-site' in args:
740 buffer.append(USER_SITE)
741
742 if buffer:
743 print(os.pathsep.join(buffer))
744 if ENABLE_USER_SITE:
745 sys.exit(0)
746 elif ENABLE_USER_SITE is False:
747 sys.exit(1)
748 elif ENABLE_USER_SITE is None:
749 sys.exit(2)
750 else:
751 sys.exit(3)
752 else:
753 import textwrap
754 print(textwrap.dedent(help % (sys.argv[0], os.pathsep)))
755 sys.exit(10)
756
757 if __name__ == '__main__':
758 _script()

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