| """Append module search paths for third-party packages to sys.path. |
| |
| **************************************************************** |
| * This module is automatically imported during initialization. * |
| **************************************************************** |
| |
| This will append site-specific paths to the module search path. On |
| Unix (including Mac OSX), it starts with sys.prefix and |
| sys.exec_prefix (if different) and appends |
| lib/python<version>/site-packages as well as lib/site-python. |
| On other platforms (such as Windows), it tries each of the |
| prefixes directly, as well as with lib/site-packages appended. The |
| resulting directories, if they exist, are appended to sys.path, and |
| also inspected for path configuration files. |
| |
| If a file named "pyvenv.cfg" exists one directory above sys.executable, |
| sys.prefix and sys.exec_prefix are set to that directory and |
| it is also checked for site-packages and site-python (sys.base_prefix and |
| sys.base_exec_prefix will always be the "real" prefixes of the Python |
| installation). If "pyvenv.cfg" (a bootstrap configuration file) contains |
| the key "include-system-site-packages" set to anything other than "false" |
| (case-insensitive), the system-level prefixes will still also be |
| searched for site-packages; otherwise they won't. |
| |
| All of the resulting site-specific directories, if they exist, are |
| appended to sys.path, and also inspected for path configuration |
| files. |
| |
| A path configuration file is a file whose name has the form |
| <package>.pth; its contents are additional directories (one per line) |
| to be added to sys.path. Non-existing directories (or |
| non-directories) are never added to sys.path; no directory is added to |
| sys.path more than once. Blank lines and lines beginning with |
| '#' are skipped. Lines starting with 'import' are executed. |
| |
| For example, suppose sys.prefix and sys.exec_prefix are set to |
| /usr/local and there is a directory /usr/local/lib/python2.5/site-packages |
| with three subdirectories, foo, bar and spam, and two path |
| configuration files, foo.pth and bar.pth. Assume foo.pth contains the |
| following: |
| |
| # foo package configuration |
| foo |
| bar |
| bletch |
| |
| and bar.pth contains: |
| |
| # bar package configuration |
| bar |
| |
| Then the following directories are added to sys.path, in this order: |
| |
| /usr/local/lib/python2.5/site-packages/bar |
| /usr/local/lib/python2.5/site-packages/foo |
| |
| Note that bletch is omitted because it doesn't exist; bar precedes foo |
| because bar.pth comes alphabetically before foo.pth; and spam is |
| omitted because it is not mentioned in either path configuration file. |
| |
| The readline module is also automatically configured to enable |
| completion for systems that support it. This can be overriden in |
| sitecustomize, usercustomize or PYTHONSTARTUP. |
| |
| After these operations, an attempt is made to import a module |
| named sitecustomize, which can perform arbitrary additional |
| site-specific customizations. If this import fails with an |
| ImportError exception, it is silently ignored. |
| """ |
| |
| import sys |
| import os |
| import builtins |
| import _sitebuiltins |
| |
| # Prefixes for site-packages; add additional prefixes like /usr/local here |
| PREFIXES = [sys.prefix, sys.exec_prefix] |
| # Enable per user site-packages directory |
| # set it to False to disable the feature or True to force the feature |
| ENABLE_USER_SITE = None |
| |
| # for distutils.commands.install |
| # These values are initialized by the getuserbase() and getusersitepackages() |
| # functions, through the main() function when Python starts. |
| USER_SITE = None |
| USER_BASE = None |
| |
| |
| def makepath(*paths): |
| dir = os.path.join(*paths) |
| try: |
| dir = os.path.abspath(dir) |
| except OSError: |
| pass |
| return dir, os.path.normcase(dir) |
| |
| |
| def abs_paths(): |
| """Set all module __file__ and __cached__ attributes to an absolute path""" |
| for m in set(sys.modules.values()): |
| if (getattr(getattr(m, '__loader__', None), '__module__', None) != |
| '_frozen_importlib'): |
| continue # don't mess with a PEP 302-supplied __file__ |
| try: |
| m.__file__ = os.path.abspath(m.__file__) |
| except (AttributeError, OSError): |
| pass |
| try: |
| m.__cached__ = os.path.abspath(m.__cached__) |
| except (AttributeError, OSError): |
| pass |
| |
| |
| def removeduppaths(): |
| """ Remove duplicate entries from sys.path along with making them |
| absolute""" |
| # This ensures that the initial path provided by the interpreter contains |
| # only absolute pathnames, even if we're running from the build directory. |
| L = [] |
| known_paths = set() |
| for dir in sys.path: |
| # Filter out duplicate paths (on case-insensitive file systems also |
| # if they only differ in case); turn relative paths into absolute |
| # paths. |
| dir, dircase = makepath(dir) |
| if not dircase in known_paths: |
| L.append(dir) |
| known_paths.add(dircase) |
| sys.path[:] = L |
| return known_paths |
| |
| |
| def _init_pathinfo(): |
| """Return a set containing all existing directory entries from sys.path""" |
| d = set() |
| for dir in sys.path: |
| try: |
| if os.path.isdir(dir): |
| dir, dircase = makepath(dir) |
| d.add(dircase) |
| except TypeError: |
| continue |
| return d |
| |
| |
| def addpackage(sitedir, name, known_paths): |
| """Process a .pth file within the site-packages directory: |
| For each line in the file, either combine it with sitedir to a path |
| and add that to known_paths, or execute it if it starts with 'import '. |
| """ |
| if known_paths is None: |
| known_paths = _init_pathinfo() |
| reset = 1 |
| else: |
| reset = 0 |
| fullname = os.path.join(sitedir, name) |
| try: |
| f = open(fullname, "r") |
| except OSError: |
| return |
| with f: |
| for n, line in enumerate(f): |
| if line.startswith("#"): |
| continue |
| try: |
| if line.startswith(("import ", "import\t")): |
| exec(line) |
| continue |
| line = line.rstrip() |
| dir, dircase = makepath(sitedir, line) |
| if not dircase in known_paths and os.path.exists(dir): |
| sys.path.append(dir) |
| known_paths.add(dircase) |
| except Exception: |
| print("Error processing line {:d} of {}:\n".format(n+1, fullname), |
| file=sys.stderr) |
| import traceback |
| for record in traceback.format_exception(*sys.exc_info()): |
| for line in record.splitlines(): |
| print(' '+line, file=sys.stderr) |
| print("\nRemainder of file ignored", file=sys.stderr) |
| break |
| if reset: |
| known_paths = None |
| return known_paths |
| |
| |
| def addsitedir(sitedir, known_paths=None): |
| """Add 'sitedir' argument to sys.path if missing and handle .pth files in |
| 'sitedir'""" |
| if known_paths is None: |
| known_paths = _init_pathinfo() |
| reset = 1 |
| else: |
| reset = 0 |
| sitedir, sitedircase = makepath(sitedir) |
| if not sitedircase in known_paths: |
| sys.path.append(sitedir) # Add path component |
| known_paths.add(sitedircase) |
| try: |
| names = os.listdir(sitedir) |
| except OSError: |
| return |
| names = [name for name in names if name.endswith(".pth")] |
| for name in sorted(names): |
| addpackage(sitedir, name, known_paths) |
| if reset: |
| known_paths = None |
| return known_paths |
| |
| |
| def check_enableusersite(): |
| """Check if user site directory is safe for inclusion |
| |
| The function tests for the command line flag (including environment var), |
| process uid/gid equal to effective uid/gid. |
| |
| None: Disabled for security reasons |
| False: Disabled by user (command line option) |
| True: Safe and enabled |
| """ |
| if sys.flags.no_user_site: |
| return False |
| |
| if hasattr(os, "getuid") and hasattr(os, "geteuid"): |
| # check process uid == effective uid |
| if os.geteuid() != os.getuid(): |
| return None |
| if hasattr(os, "getgid") and hasattr(os, "getegid"): |
| # check process gid == effective gid |
| if os.getegid() != os.getgid(): |
| return None |
| |
| return True |
| |
| def getuserbase(): |
| """Returns the `user base` directory path. |
| |
| The `user base` directory can be used to store data. If the global |
| variable ``USER_BASE`` is not initialized yet, this function will also set |
| it. |
| """ |
| global USER_BASE |
| if USER_BASE is not None: |
| return USER_BASE |
| from sysconfig import get_config_var |
| USER_BASE = get_config_var('userbase') |
| return USER_BASE |
| |
| def getusersitepackages(): |
| """Returns the user-specific site-packages directory path. |
| |
| If the global variable ``USER_SITE`` is not initialized yet, this |
| function will also set it. |
| """ |
| global USER_SITE |
| user_base = getuserbase() # this will also set USER_BASE |
| |
| if USER_SITE is not None: |
| return USER_SITE |
| |
| from sysconfig import get_path |
| |
| if sys.platform == 'darwin': |
| from sysconfig import get_config_var |
| if get_config_var('PYTHONFRAMEWORK'): |
| USER_SITE = get_path('purelib', 'osx_framework_user') |
| return USER_SITE |
| |
| USER_SITE = get_path('purelib', '%s_user' % os.name) |
| return USER_SITE |
| |
| def addusersitepackages(known_paths): |
| """Add a per user site-package to sys.path |
| |
| Each user has its own python directory with site-packages in the |
| home directory. |
| """ |
| # get the per user site-package path |
| # this call will also make sure USER_BASE and USER_SITE are set |
| user_site = getusersitepackages() |
| |
| if ENABLE_USER_SITE and os.path.isdir(user_site): |
| addsitedir(user_site, known_paths) |
| return known_paths |
| |
| def getsitepackages(prefixes=None): |
| """Returns a list containing all global site-packages directories |
| (and possibly site-python). |
| |
| For each directory present in ``prefixes`` (or the global ``PREFIXES``), |
| this function will find its `site-packages` subdirectory depending on the |
| system environment, and will return a list of full paths. |
| """ |
| sitepackages = [] |
| seen = set() |
| |
| if prefixes is None: |
| prefixes = PREFIXES |
| |
| for prefix in prefixes: |
| if not prefix or prefix in seen: |
| continue |
| seen.add(prefix) |
| |
| if os.sep == '/': |
| sitepackages.append(os.path.join(prefix, "lib", |
| "python" + sys.version[:3], |
| "site-packages")) |
| sitepackages.append(os.path.join(prefix, "lib", "site-python")) |
| else: |
| sitepackages.append(prefix) |
| sitepackages.append(os.path.join(prefix, "lib", "site-packages")) |
| if sys.platform == "darwin": |
| # for framework builds *only* we add the standard Apple |
| # locations. |
| from sysconfig import get_config_var |
| framework = get_config_var("PYTHONFRAMEWORK") |
| if framework: |
| sitepackages.append( |
| os.path.join("/Library", framework, |
| sys.version[:3], "site-packages")) |
| return sitepackages |
| |
| def addsitepackages(known_paths, prefixes=None): |
| """Add site-packages (and possibly site-python) to sys.path""" |
| for sitedir in getsitepackages(prefixes): |
| if os.path.isdir(sitedir): |
| addsitedir(sitedir, known_paths) |
| |
| return known_paths |
| |
| def setquit(): |
| """Define new builtins 'quit' and 'exit'. |
| |
| These are objects which make the interpreter exit when called. |
| The repr of each object contains a hint at how it works. |
| |
| """ |
| if os.sep == ':': |
| eof = 'Cmd-Q' |
| elif os.sep == '\\': |
| eof = 'Ctrl-Z plus Return' |
| else: |
| eof = 'Ctrl-D (i.e. EOF)' |
| |
| builtins.quit = _sitebuiltins.Quitter('quit', eof) |
| builtins.exit = _sitebuiltins.Quitter('exit', eof) |
| |
| |
| def setcopyright(): |
| """Set 'copyright' and 'credits' in builtins""" |
| builtins.copyright = _sitebuiltins._Printer("copyright", sys.copyright) |
| if sys.platform[:4] == 'java': |
| builtins.credits = _sitebuiltins._Printer( |
| "credits", |
| "Jython is maintained by the Jython developers (www.jython.org).") |
| else: |
| builtins.credits = _sitebuiltins._Printer("credits", """\ |
| Thanks to CWI, CNRI, BeOpen.com, Zope Corporation and a cast of thousands |
| for supporting Python development. See www.python.org for more information.""") |
| here = os.path.dirname(os.__file__) |
| builtins.license = _sitebuiltins._Printer( |
| "license", |
| "See http://www.python.org/download/releases/%.5s/license" % sys.version, |
| ["LICENSE.txt", "LICENSE"], |
| [os.path.join(here, os.pardir), here, os.curdir]) |
| |
| |
| def sethelper(): |
| builtins.help = _sitebuiltins._Helper() |
| |
| def enablerlcompleter(): |
| """Enable default readline configuration on interactive prompts, by |
| registering a sys.__interactivehook__. |
| |
| If the readline module can be imported, the hook will set the Tab key |
| as completion key and register ~/.python_history as history file. |
| This can be overriden in the sitecustomize or usercustomize module, |
| or in a PYTHONSTARTUP file. |
| """ |
| def register_readline(): |
| import atexit |
| try: |
| import readline |
| import rlcompleter |
| except ImportError: |
| return |
| |
| # Reading the initialization (config) file may not be enough to set a |
| # completion key, so we set one first and then read the file. |
| readline_doc = getattr(readline, '__doc__', '') |
| if readline_doc is not None and 'libedit' in readline_doc: |
| readline.parse_and_bind('bind ^I rl_complete') |
| else: |
| readline.parse_and_bind('tab: complete') |
| |
| try: |
| readline.read_init_file() |
| except OSError: |
| # An OSError here could have many causes, but the most likely one |
| # is that there's no .inputrc file (or .editrc file in the case of |
| # Mac OS X + libedit) in the expected location. In that case, we |
| # want to ignore the exception. |
| pass |
| |
| if readline.get_history_item(1) is None: |
| # If no history was loaded, default to .python_history. |
| # The guard is necessary to avoid doubling history size at |
| # each interpreter exit when readline was already configured |
| # through a PYTHONSTARTUP hook, see: |
| # http://bugs.python.org/issue5845#msg198636 |
| history = os.path.join(os.path.expanduser('~'), |
| '.python_history') |
| try: |
| readline.read_history_file(history) |
| except IOError: |
| pass |
| atexit.register(readline.write_history_file, history) |
| |
| sys.__interactivehook__ = register_readline |
| |
| def aliasmbcs(): |
| """On Windows, some default encodings are not provided by Python, |
| while they are always available as "mbcs" in each locale. Make |
| them usable by aliasing to "mbcs" in such a case.""" |
| if sys.platform == 'win32': |
| import _bootlocale, codecs |
| enc = _bootlocale.getpreferredencoding(False) |
| if enc.startswith('cp'): # "cp***" ? |
| try: |
| codecs.lookup(enc) |
| except LookupError: |
| import encodings |
| encodings._cache[enc] = encodings._unknown |
| encodings.aliases.aliases[enc] = 'mbcs' |
| |
| CONFIG_LINE = r'^(?P<key>(\w|[-_])+)\s*=\s*(?P<value>.*)\s*$' |
| |
| def venv(known_paths): |
| global PREFIXES, ENABLE_USER_SITE |
| |
| env = os.environ |
| if sys.platform == 'darwin' and '__PYVENV_LAUNCHER__' in env: |
| executable = os.environ['__PYVENV_LAUNCHER__'] |
| else: |
| executable = sys.executable |
| exe_dir, _ = os.path.split(os.path.abspath(executable)) |
| site_prefix = os.path.dirname(exe_dir) |
| sys._home = None |
| conf_basename = 'pyvenv.cfg' |
| candidate_confs = [ |
| conffile for conffile in ( |
| os.path.join(exe_dir, conf_basename), |
| os.path.join(site_prefix, conf_basename) |
| ) |
| if os.path.isfile(conffile) |
| ] |
| |
| if candidate_confs: |
| import re |
| config_line = re.compile(CONFIG_LINE) |
| virtual_conf = candidate_confs[0] |
| system_site = "true" |
| with open(virtual_conf) as f: |
| for line in f: |
| line = line.strip() |
| m = CONFIG_LINE.match(line) |
| if m: |
| d = m.groupdict() |
| key, value = d['key'].lower(), d['value'] |
| if key == 'include-system-site-packages': |
| system_site = value.lower() |
| elif key == 'home': |
| sys._home = value |
| |
| sys.prefix = sys.exec_prefix = site_prefix |
| |
| # Doing this here ensures venv takes precedence over user-site |
| addsitepackages(known_paths, [sys.prefix]) |
| |
| # addsitepackages will process site_prefix again if its in PREFIXES, |
| # but that's ok; known_paths will prevent anything being added twice |
| if system_site == "true": |
| PREFIXES.insert(0, sys.prefix) |
| else: |
| PREFIXES = [sys.prefix] |
| ENABLE_USER_SITE = False |
| |
| return known_paths |
| |
| |
| def execsitecustomize(): |
| """Run custom site specific code, if available.""" |
| try: |
| import sitecustomize |
| except ImportError: |
| pass |
| except Exception as err: |
| if os.environ.get("PYTHONVERBOSE"): |
| sys.excepthook(*sys.exc_info()) |
| else: |
| sys.stderr.write( |
| "Error in sitecustomize; set PYTHONVERBOSE for traceback:\n" |
| "%s: %s\n" % |
| (err.__class__.__name__, err)) |
| |
| |
| def execusercustomize(): |
| """Run custom user specific code, if available.""" |
| try: |
| import usercustomize |
| except ImportError: |
| pass |
| except Exception as err: |
| if os.environ.get("PYTHONVERBOSE"): |
| sys.excepthook(*sys.exc_info()) |
| else: |
| sys.stderr.write( |
| "Error in usercustomize; set PYTHONVERBOSE for traceback:\n" |
| "%s: %s\n" % |
| (err.__class__.__name__, err)) |
| |
| |
| def main(): |
| """Add standard site-specific directories to the module search path. |
| |
| This function is called automatically when this module is imported, |
| unless the python interpreter was started with the -S flag. |
| """ |
| global ENABLE_USER_SITE |
| |
| abs_paths() |
| known_paths = removeduppaths() |
| known_paths = venv(known_paths) |
| if ENABLE_USER_SITE is None: |
| ENABLE_USER_SITE = check_enableusersite() |
| known_paths = addusersitepackages(known_paths) |
| known_paths = addsitepackages(known_paths) |
| setquit() |
| setcopyright() |
| sethelper() |
| enablerlcompleter() |
| aliasmbcs() |
| execsitecustomize() |
| if ENABLE_USER_SITE: |
| execusercustomize() |
| |
| # Prevent edition of sys.path when python was started with -S and |
| # site is imported later. |
| if not sys.flags.no_site: |
| main() |
| |
| def _script(): |
| help = """\ |
| %s [--user-base] [--user-site] |
| |
| Without arguments print some useful information |
| With arguments print the value of USER_BASE and/or USER_SITE separated |
| by '%s'. |
| |
| Exit codes with --user-base or --user-site: |
| 0 - user site directory is enabled |
| 1 - user site directory is disabled by user |
| 2 - uses site directory is disabled by super user |
| or for security reasons |
| >2 - unknown error |
| """ |
| args = sys.argv[1:] |
| if not args: |
| user_base = getuserbase() |
| user_site = getusersitepackages() |
| print("sys.path = [") |
| for dir in sys.path: |
| print(" %r," % (dir,)) |
| print("]") |
| print("USER_BASE: %r (%s)" % (user_base, |
| "exists" if os.path.isdir(user_base) else "doesn't exist")) |
| print("USER_SITE: %r (%s)" % (user_site, |
| "exists" if os.path.isdir(user_site) else "doesn't exist")) |
| print("ENABLE_USER_SITE: %r" % ENABLE_USER_SITE) |
| sys.exit(0) |
| |
| buffer = [] |
| if '--user-base' in args: |
| buffer.append(USER_BASE) |
| if '--user-site' in args: |
| buffer.append(USER_SITE) |
| |
| if buffer: |
| print(os.pathsep.join(buffer)) |
| if ENABLE_USER_SITE: |
| sys.exit(0) |
| elif ENABLE_USER_SITE is False: |
| sys.exit(1) |
| elif ENABLE_USER_SITE is None: |
| sys.exit(2) |
| else: |
| sys.exit(3) |
| else: |
| import textwrap |
| print(textwrap.dedent(help % (sys.argv[0], os.pathsep))) |
| sys.exit(10) |
| |
| if __name__ == '__main__': |
| _script() |