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Commit 884ec05c authored by PJ Eby's avatar PJ Eby
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New version of site.py hack, for better compatibility with distros that 

patch the stdlib site.py.  This version runs the stdlib site.py, then
tries to hack sys.path back to something resembling what the old version
did.  Unfortunately, this is complex since site.py and .pth files can
munge the path in rather arbitrary ways, and the initial setup of
sys.path is dependent on the platform and Python version.  This code has
been tested on Linux, cygwin, and Windows Python, versions 2.2, 2.3, and
2.4 (although not all versions on all platforms), and appears to perform
as intended.

--HG--
branch : setuptools
extra : convert_revision : svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/sandbox/trunk/setuptools%4042302
parent f2489447
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Showing with 72 additions and 398 deletions
site.py
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"""Append module search paths for third-party packages to sys.path.
****************************************************************
* This module is automatically imported during initialization, *
* if you add the setuptools egg to PYTHONPATH (to support the *
* simple non-root installation mode) *
****************************************************************
In earlier versions of Python (up to 1.5a3), scripts or modules that
needed to use site-specific modules would place ``import site''
somewhere near the top of their code. Because of the automatic
import, this is no longer necessary (but code that does it still
works).
This will append site-specific paths to the module search path. On
Unix, 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 (mainly Mac and Windows), it uses just sys.prefix
(and sys.exec_prefix, if different, but this is unlikely). The
resulting 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/python1.5/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/python1.5/site-packages/bar
/usr/local/lib/python1.5/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.
After these path manipulations, 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 __builtin__
def makepath(*paths):
dir = os.path.abspath(os.path.join(*paths))
return dir, os.path.normcase(dir)
def abs__file__():
"""Set all module' __file__ attribute to an absolute path"""
for m in sys.modules.values():
try:
m.__file__ = os.path.abspath(m.__file__)
except AttributeError:
continue
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 = {}
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[dircase] = 1
sys.path[:] = L
return known_paths
# XXX This should not be part of site.py, since it is needed even when
# using the -S option for Python. See http://www.python.org/sf/586680
def addbuilddir():
"""Append ./build/lib.<platform> in case we're running in the build dir
(especially for Guido :-)"""
from distutils.util import get_platform
s = "build/lib.%s-%.3s" % (get_platform(), sys.version)
s = os.path.join(os.path.dirname(sys.path[-1]), s)
sys.path.append(s)
def _init_pathinfo():
"""Return a set containing all existing directory entries from sys.path"""
d = {}
for dir in sys.path:
try:
if os.path.isdir(dir):
dir, dircase = makepath(dir)
d[dircase] = 1
except TypeError:
continue
return d
def addpackage(sitedir, name, known_paths):
"""Add a new path to known_paths by combining sitedir and 'name' or execute
sitedir if it starts with 'import'"""
if known_paths is None:
known_paths = _init_pathinfo()
reset = 1
def __boot():
import sys, imp, os, os.path
PYTHONPATH = os.environ.get('PYTHONPATH')
if PYTHONPATH is None or (sys.platform=='win32' and not PYTHONPATH):
PYTHONPATH = []
else:
PYTHONPATH = PYTHONPATH.split(os.pathsep)
pic = getattr(sys,'path_importer_cache',{})
stdpath = sys.path[len(PYTHONPATH):]
mydir = os.path.dirname(__file__)
#print "searching",stdpath,sys.path
for item in stdpath:
if item==mydir or not item:
continue # skip if current dir. on Windows, or my own directory
importer = pic.get(item)
if importer is not None:
loader = importer.find_module('site')
if loader is not None:
# This should actually reload the current module
loader.load_module('site')
break
else:
reset = 0
fullname = os.path.join(sitedir, name)
try:
f = open(fullname, "rU")
except IOError:
return
try:
for line in f:
if line.startswith("#"):
stream, path, descr = imp.find_module('site',[item])
except ImportError:
continue
if line.startswith("import"):
exec line
if stream is None:
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[dircase] = 1
finally:
f.close()
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
try:
names = os.listdir(sitedir)
except os.error:
return
names.sort()
for name in names:
if name.endswith(os.extsep + "pth"):
addpackage(sitedir, name, known_paths)
if reset:
known_paths = None
return known_paths
def addsitepackages(known_paths):
"""Add site-packages (and possibly site-python) to sys.path"""
prefixes = [sys.prefix]
if sys.exec_prefix != sys.prefix:
prefixes.append(sys.exec_prefix)
for prefix in prefixes:
if prefix:
if sys.platform in ('os2emx', 'riscos'):
sitedirs = [os.path.join(prefix, "Lib", "site-packages")]
elif os.sep == '/':
sitedirs = [os.path.join(prefix,
"lib",
"python" + sys.version[:3],
"site-packages"),
os.path.join(prefix, "lib", "site-python")]
else:
sitedirs = [prefix, os.path.join(prefix, "lib", "site-packages")]
if sys.platform == 'darwin':
# for framework builds *only* we add the standard Apple
# locations. Currently only per-user, but /Library and
# /Network/Library could be added too
if 'Python.framework' in prefix:
home = os.environ.get('HOME')
if home:
sitedirs.append(
os.path.join(home,
'Library',
'Python',
sys.version[:3],
'site-packages'))
for sitedir in sys.path+sitedirs:
if sitedir and os.path.isdir(sitedir):
addsitedir(sitedir, known_paths)
return None
def setBEGINLIBPATH():
"""The OS/2 EMX port has optional extension modules that do double duty
as DLLs (and must use the .DLL file extension) for other extensions.
The library search path needs to be amended so these will be found
during module import. Use BEGINLIBPATH so that these are at the start
of the library search path.
"""
dllpath = os.path.join(sys.prefix, "Lib", "lib-dynload")
libpath = os.environ['BEGINLIBPATH'].split(';')
if libpath[-1]:
libpath.append(dllpath)
else:
libpath[-1] = dllpath
os.environ['BEGINLIBPATH'] = ';'.join(libpath)
def setquit():
"""Define new built-ins 'quit' and 'exit'.
These are simply strings that display a hint on how to exit.
"""
if os.sep == ':':
exit = 'Use Cmd-Q to quit.'
elif os.sep == '\\':
exit = 'Use Ctrl-Z plus Return to exit.'
else:
exit = 'Use Ctrl-D (i.e. EOF) to exit.'
__builtin__.quit = __builtin__.exit = exit
class _Printer(object):
"""interactive prompt objects for printing the license text, a list of
contributors and the copyright notice."""
MAXLINES = 23
def __init__(self, name, data, files=(), dirs=()):
self.__name = name
self.__data = data
self.__files = files
self.__dirs = dirs
self.__lines = None
def __setup(self):
if self.__lines:
return
data = None
for dir in self.__dirs:
for filename in self.__files:
filename = os.path.join(dir, filename)
try:
fp = file(filename, "rU")
data = fp.read()
fp.close()
break
except IOError:
pass
if data:
break
if not data:
data = self.__data
self.__lines = data.split('\n')
self.__linecnt = len(self.__lines)
def __repr__(self):
self.__setup()
if len(self.__lines) <= self.MAXLINES:
return "\n".join(self.__lines)
else:
return "Type %s() to see the full %s text" % ((self.__name,)*2)
def __call__(self):
self.__setup()
prompt = 'Hit Return for more, or q (and Return) to quit: '
lineno = 0
while 1:
try:
for i in range(lineno, lineno + self.MAXLINES):
print self.__lines[i]
except IndexError:
break
else:
lineno += self.MAXLINES
key = None
while key is None:
key = raw_input(prompt)
if key not in ('', 'q'):
key = None
if key == 'q':
# This should actually reload the current module
imp.load_module('site',stream,path,descr)
finally:
stream.close()
break
def setcopyright():
"""Set 'copyright' and 'credits' in __builtin__"""
__builtin__.copyright = _Printer("copyright", sys.copyright)
if sys.platform[:4] == 'java':
__builtin__.credits = _Printer(
"credits",
"Jython is maintained by the Jython developers (www.jython.org).")
else:
__builtin__.credits = _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__)
__builtin__.license = _Printer(
"license", "See http://www.python.org/%.3s/license.html" % sys.version,
["LICENSE.txt", "LICENSE"],
[os.path.join(here, os.pardir), here, os.curdir])
raise ImportError("Couldn't find the real 'site' module")
#print "loaded", __file__
class _Helper(object):
"""Define the built-in 'help'.
This is a wrapper around pydoc.help (with a twist).
known_paths = dict([(makepath(item)[1],1) for item in sys.path]) # 2.2 comp
"""
for item in PYTHONPATH:
addsitedir(item)
def __repr__(self):
return "Type help() for interactive help, " \
"or help(object) for help about object."
def __call__(self, *args, **kwds):
import pydoc
return pydoc.help(*args, **kwds)
d,nd = makepath(stdpath[0])
insert_at = None
skipped = []
new_path = []
def sethelper():
__builtin__.help = _Helper()
for item in sys.path:
p,np = makepath(item)
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 locale, codecs
enc = locale.getdefaultlocale()[1]
if enc.startswith('cp'): # "cp***" ?
try:
codecs.lookup(enc)
except LookupError:
import encodings
encodings._cache[enc] = encodings._unknown
encodings.aliases.aliases[enc] = 'mbcs'
if np==nd and insert_at is None:
# We've hit the first 'system' path entry, so added entries go here
new_path.extend(skipped)
insert_at = len(new_path)
skipped = []
def setencoding():
"""Set the string encoding used by the Unicode implementation. The
default is 'ascii', but if you're willing to experiment, you can
change this."""
encoding = "ascii" # Default value set by _PyUnicode_Init()
if 0:
# Enable to support locale aware default string encodings.
import locale
loc = locale.getdefaultlocale()
if loc[1]:
encoding = loc[1]
if 0:
# Enable to switch off string to Unicode coercion and implicit
# Unicode to string conversion.
encoding = "undefined"
if encoding != "ascii":
# On Non-Unicode builds this will raise an AttributeError...
sys.setdefaultencoding(encoding) # Needs Python Unicode build !
if np in known_paths:
# Old path, just copy
new_path.append(item)
elif insert_at is None:
# New path before the insert point, buffer it
skipped.append(item)
else:
# new path after the insert point, back-insert it
new_path.insert(insert_at, item)
insert_at += 1
new_path.extend(skipped)
sys.path[:] = new_path
def execsitecustomize():
"""Run custom site specific code, if available."""
try:
import sitecustomize
except ImportError:
pass
if __name__=='site':
__boot()
del __boot
def main():
abs__file__()
paths_in_sys = removeduppaths()
if (os.name == "posix" and sys.path and
os.path.basename(sys.path[-1]) == "Modules"):
addbuilddir()
paths_in_sys = addsitepackages(paths_in_sys)
if sys.platform == 'os2emx':
setBEGINLIBPATH()
setquit()
setcopyright()
sethelper()
aliasmbcs()
setencoding()
execsitecustomize()
# Remove sys.setdefaultencoding() so that users cannot change the
# encoding after initialization. The test for presence is needed when
# this module is run as a script, because this code is executed twice.
if hasattr(sys, "setdefaultencoding"):
del sys.setdefaultencoding
main()
def _test():
print "sys.path = ["
for dir in sys.path:
print " %r," % (dir,)
print "]"
if __name__ == '__main__':
_test()
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