mirror of
https://github.com/python/cpython.git
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0ab917e07e
The write_history() atexit function of the readline completer now ignores any OSError to ignore error if the filesystem is read-only, instead of only ignoring FileNotFoundError and PermissionError.
652 lines
21 KiB
Python
652 lines
21 KiB
Python
"""Append module search paths for third-party packages to sys.path.
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****************************************************************
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* This module is automatically imported during initialization. *
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****************************************************************
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This will append site-specific paths to the module search path. On
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Unix (including Mac OSX), it starts with sys.prefix and
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sys.exec_prefix (if different) and appends
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lib/python<version>/site-packages.
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On other platforms (such as Windows), it tries each of the
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prefixes directly, as well as with lib/site-packages appended. The
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resulting directories, if they exist, are appended to sys.path, and
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also inspected for path configuration files.
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If a file named "pyvenv.cfg" exists one directory above sys.executable,
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sys.prefix and sys.exec_prefix are set to that directory and
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it is also checked for site-packages (sys.base_prefix and
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sys.base_exec_prefix will always be the "real" prefixes of the Python
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installation). If "pyvenv.cfg" (a bootstrap configuration file) contains
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the key "include-system-site-packages" set to anything other than "false"
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(case-insensitive), the system-level prefixes will still also be
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searched for site-packages; otherwise they won't.
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All of the resulting site-specific directories, if they exist, are
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appended to sys.path, and also inspected for path configuration
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files.
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A path configuration file is a file whose name has the form
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<package>.pth; its contents are additional directories (one per line)
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to be added to sys.path. Non-existing directories (or
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non-directories) are never added to sys.path; no directory is added to
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sys.path more than once. Blank lines and lines beginning with
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'#' are skipped. Lines starting with 'import' are executed.
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For example, suppose sys.prefix and sys.exec_prefix are set to
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/usr/local and there is a directory /usr/local/lib/python2.5/site-packages
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with three subdirectories, foo, bar and spam, and two path
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configuration files, foo.pth and bar.pth. Assume foo.pth contains the
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following:
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# foo package configuration
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foo
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bar
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bletch
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and bar.pth contains:
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# bar package configuration
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bar
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Then the following directories are added to sys.path, in this order:
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/usr/local/lib/python2.5/site-packages/bar
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/usr/local/lib/python2.5/site-packages/foo
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Note that bletch is omitted because it doesn't exist; bar precedes foo
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because bar.pth comes alphabetically before foo.pth; and spam is
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omitted because it is not mentioned in either path configuration file.
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The readline module is also automatically configured to enable
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completion for systems that support it. This can be overridden in
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sitecustomize, usercustomize or PYTHONSTARTUP. Starting Python in
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isolated mode (-I) disables automatic readline configuration.
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After these operations, an attempt is made to import a module
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named sitecustomize, which can perform arbitrary additional
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site-specific customizations. If this import fails with an
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ImportError exception, it is silently ignored.
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"""
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import sys
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import os
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import builtins
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import _sitebuiltins
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import io
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# Prefixes for site-packages; add additional prefixes like /usr/local here
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PREFIXES = [sys.prefix, sys.exec_prefix]
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# Enable per user site-packages directory
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# set it to False to disable the feature or True to force the feature
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ENABLE_USER_SITE = None
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# for distutils.commands.install
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# These values are initialized by the getuserbase() and getusersitepackages()
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# functions, through the main() function when Python starts.
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USER_SITE = None
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USER_BASE = None
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def _trace(message):
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if sys.flags.verbose:
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print(message, file=sys.stderr)
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def makepath(*paths):
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dir = os.path.join(*paths)
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try:
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dir = os.path.abspath(dir)
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except OSError:
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pass
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return dir, os.path.normcase(dir)
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def abs_paths():
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"""Set all module __file__ and __cached__ attributes to an absolute path"""
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for m in set(sys.modules.values()):
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if (getattr(getattr(m, '__loader__', None), '__module__', None) not in
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('_frozen_importlib', '_frozen_importlib_external')):
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continue # don't mess with a PEP 302-supplied __file__
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try:
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m.__file__ = os.path.abspath(m.__file__)
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except (AttributeError, OSError, TypeError):
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pass
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try:
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m.__cached__ = os.path.abspath(m.__cached__)
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except (AttributeError, OSError, TypeError):
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pass
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def removeduppaths():
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""" Remove duplicate entries from sys.path along with making them
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absolute"""
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# This ensures that the initial path provided by the interpreter contains
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# only absolute pathnames, even if we're running from the build directory.
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L = []
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known_paths = set()
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for dir in sys.path:
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# Filter out duplicate paths (on case-insensitive file systems also
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# if they only differ in case); turn relative paths into absolute
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# paths.
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dir, dircase = makepath(dir)
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if dircase not in known_paths:
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L.append(dir)
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known_paths.add(dircase)
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sys.path[:] = L
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return known_paths
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def _init_pathinfo():
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"""Return a set containing all existing file system items from sys.path."""
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d = set()
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for item in sys.path:
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try:
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if os.path.exists(item):
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_, itemcase = makepath(item)
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d.add(itemcase)
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except TypeError:
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continue
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return d
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def addpackage(sitedir, name, known_paths):
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"""Process a .pth file within the site-packages directory:
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For each line in the file, either combine it with sitedir to a path
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and add that to known_paths, or execute it if it starts with 'import '.
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"""
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if known_paths is None:
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known_paths = _init_pathinfo()
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reset = True
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else:
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reset = False
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fullname = os.path.join(sitedir, name)
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_trace(f"Processing .pth file: {fullname!r}")
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try:
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f = io.TextIOWrapper(io.open_code(fullname))
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except OSError:
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return
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with f:
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for n, line in enumerate(f):
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if line.startswith("#"):
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continue
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try:
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if line.startswith(("import ", "import\t")):
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exec(line)
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continue
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line = line.rstrip()
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dir, dircase = makepath(sitedir, line)
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if not dircase in known_paths and os.path.exists(dir):
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sys.path.append(dir)
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known_paths.add(dircase)
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except Exception:
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print("Error processing line {:d} of {}:\n".format(n+1, fullname),
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file=sys.stderr)
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import traceback
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for record in traceback.format_exception(*sys.exc_info()):
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for line in record.splitlines():
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print(' '+line, file=sys.stderr)
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print("\nRemainder of file ignored", file=sys.stderr)
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break
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if reset:
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known_paths = None
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return known_paths
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def addsitedir(sitedir, known_paths=None):
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"""Add 'sitedir' argument to sys.path if missing and handle .pth files in
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'sitedir'"""
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_trace(f"Adding directory: {sitedir!r}")
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if known_paths is None:
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known_paths = _init_pathinfo()
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reset = True
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else:
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reset = False
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sitedir, sitedircase = makepath(sitedir)
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if not sitedircase in known_paths:
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sys.path.append(sitedir) # Add path component
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known_paths.add(sitedircase)
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try:
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names = os.listdir(sitedir)
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except OSError:
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return
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names = [name for name in names if name.endswith(".pth")]
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for name in sorted(names):
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addpackage(sitedir, name, known_paths)
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if reset:
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known_paths = None
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return known_paths
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def check_enableusersite():
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"""Check if user site directory is safe for inclusion
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The function tests for the command line flag (including environment var),
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process uid/gid equal to effective uid/gid.
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None: Disabled for security reasons
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False: Disabled by user (command line option)
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True: Safe and enabled
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"""
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if sys.flags.no_user_site:
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return False
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if hasattr(os, "getuid") and hasattr(os, "geteuid"):
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# check process uid == effective uid
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if os.geteuid() != os.getuid():
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return None
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if hasattr(os, "getgid") and hasattr(os, "getegid"):
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# check process gid == effective gid
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if os.getegid() != os.getgid():
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return None
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return True
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# NOTE: sysconfig and it's dependencies are relatively large but site module
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# needs very limited part of them.
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# To speedup startup time, we have copy of them.
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#
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# See https://bugs.python.org/issue29585
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# Copy of sysconfig._getuserbase()
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def _getuserbase():
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env_base = os.environ.get("PYTHONUSERBASE", None)
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if env_base:
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return env_base
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def joinuser(*args):
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return os.path.expanduser(os.path.join(*args))
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if os.name == "nt":
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base = os.environ.get("APPDATA") or "~"
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return joinuser(base, "Python")
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if sys.platform == "darwin" and sys._framework:
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return joinuser("~", "Library", sys._framework,
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"%d.%d" % sys.version_info[:2])
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return joinuser("~", ".local")
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# Same to sysconfig.get_path('purelib', os.name+'_user')
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def _get_path(userbase):
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version = sys.version_info
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if os.name == 'nt':
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return f'{userbase}\\Python{version[0]}{version[1]}\\site-packages'
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if sys.platform == 'darwin' and sys._framework:
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return f'{userbase}/lib/python/site-packages'
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return f'{userbase}/lib/python{version[0]}.{version[1]}/site-packages'
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def getuserbase():
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"""Returns the `user base` directory path.
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The `user base` directory can be used to store data. If the global
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variable ``USER_BASE`` is not initialized yet, this function will also set
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it.
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"""
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global USER_BASE
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if USER_BASE is None:
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USER_BASE = _getuserbase()
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return USER_BASE
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def getusersitepackages():
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"""Returns the user-specific site-packages directory path.
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If the global variable ``USER_SITE`` is not initialized yet, this
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function will also set it.
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"""
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global USER_SITE
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userbase = getuserbase() # this will also set USER_BASE
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if USER_SITE is None:
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USER_SITE = _get_path(userbase)
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return USER_SITE
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def addusersitepackages(known_paths):
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"""Add a per user site-package to sys.path
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Each user has its own python directory with site-packages in the
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home directory.
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"""
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# get the per user site-package path
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# this call will also make sure USER_BASE and USER_SITE are set
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_trace("Processing user site-packages")
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user_site = getusersitepackages()
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if ENABLE_USER_SITE and os.path.isdir(user_site):
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addsitedir(user_site, known_paths)
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return known_paths
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def getsitepackages(prefixes=None):
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"""Returns a list containing all global site-packages directories.
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For each directory present in ``prefixes`` (or the global ``PREFIXES``),
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this function will find its `site-packages` subdirectory depending on the
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system environment, and will return a list of full paths.
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"""
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sitepackages = []
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seen = set()
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if prefixes is None:
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prefixes = PREFIXES
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for prefix in prefixes:
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if not prefix or prefix in seen:
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continue
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seen.add(prefix)
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libdirs = [sys.platlibdir]
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if sys.platlibdir != "lib":
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libdirs.append("lib")
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if os.sep == '/':
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for libdir in libdirs:
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path = os.path.join(prefix, libdir,
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"python%d.%d" % sys.version_info[:2],
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"site-packages")
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sitepackages.append(path)
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else:
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sitepackages.append(prefix)
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for libdir in libdirs:
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path = os.path.join(prefix, libdir, "site-packages")
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sitepackages.append(path)
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return sitepackages
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def addsitepackages(known_paths, prefixes=None):
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"""Add site-packages to sys.path"""
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_trace("Processing global site-packages")
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for sitedir in getsitepackages(prefixes):
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if os.path.isdir(sitedir):
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addsitedir(sitedir, known_paths)
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return known_paths
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def setquit():
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"""Define new builtins 'quit' and 'exit'.
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These are objects which make the interpreter exit when called.
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The repr of each object contains a hint at how it works.
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"""
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if os.sep == '\\':
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eof = 'Ctrl-Z plus Return'
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else:
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eof = 'Ctrl-D (i.e. EOF)'
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builtins.quit = _sitebuiltins.Quitter('quit', eof)
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builtins.exit = _sitebuiltins.Quitter('exit', eof)
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def setcopyright():
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"""Set 'copyright' and 'credits' in builtins"""
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builtins.copyright = _sitebuiltins._Printer("copyright", sys.copyright)
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if sys.platform[:4] == 'java':
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builtins.credits = _sitebuiltins._Printer(
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"credits",
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"Jython is maintained by the Jython developers (www.jython.org).")
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else:
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builtins.credits = _sitebuiltins._Printer("credits", """\
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Thanks to CWI, CNRI, BeOpen.com, Zope Corporation and a cast of thousands
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for supporting Python development. See www.python.org for more information.""")
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files, dirs = [], []
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# Not all modules are required to have a __file__ attribute. See
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# PEP 420 for more details.
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if hasattr(os, '__file__'):
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here = os.path.dirname(os.__file__)
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files.extend(["LICENSE.txt", "LICENSE"])
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dirs.extend([os.path.join(here, os.pardir), here, os.curdir])
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builtins.license = _sitebuiltins._Printer(
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"license",
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"See https://www.python.org/psf/license/",
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files, dirs)
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def sethelper():
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builtins.help = _sitebuiltins._Helper()
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def enablerlcompleter():
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"""Enable default readline configuration on interactive prompts, by
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registering a sys.__interactivehook__.
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If the readline module can be imported, the hook will set the Tab key
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as completion key and register ~/.python_history as history file.
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This can be overridden in the sitecustomize or usercustomize module,
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or in a PYTHONSTARTUP file.
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"""
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def register_readline():
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import atexit
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try:
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import readline
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import rlcompleter
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except ImportError:
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return
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# Reading the initialization (config) file may not be enough to set a
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# completion key, so we set one first and then read the file.
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readline_doc = getattr(readline, '__doc__', '')
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if readline_doc is not None and 'libedit' in readline_doc:
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readline.parse_and_bind('bind ^I rl_complete')
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else:
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readline.parse_and_bind('tab: complete')
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try:
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readline.read_init_file()
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except OSError:
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# An OSError here could have many causes, but the most likely one
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# is that there's no .inputrc file (or .editrc file in the case of
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# Mac OS X + libedit) in the expected location. In that case, we
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# want to ignore the exception.
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pass
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if readline.get_current_history_length() == 0:
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# If no history was loaded, default to .python_history.
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# The guard is necessary to avoid doubling history size at
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# each interpreter exit when readline was already configured
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# through a PYTHONSTARTUP hook, see:
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# http://bugs.python.org/issue5845#msg198636
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history = os.path.join(os.path.expanduser('~'),
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'.python_history')
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try:
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readline.read_history_file(history)
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except OSError:
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pass
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def write_history():
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try:
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readline.write_history_file(history)
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except OSError:
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# bpo-19891, bpo-41193: Home directory does not exist
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# or is not writable, or the filesystem is read-only.
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pass
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atexit.register(write_history)
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sys.__interactivehook__ = register_readline
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def venv(known_paths):
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global PREFIXES, ENABLE_USER_SITE
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env = os.environ
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if sys.platform == 'darwin' and '__PYVENV_LAUNCHER__' in env:
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executable = sys._base_executable = os.environ['__PYVENV_LAUNCHER__']
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else:
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executable = sys.executable
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exe_dir, _ = os.path.split(os.path.abspath(executable))
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site_prefix = os.path.dirname(exe_dir)
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sys._home = None
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conf_basename = 'pyvenv.cfg'
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candidate_confs = [
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conffile for conffile in (
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os.path.join(exe_dir, conf_basename),
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os.path.join(site_prefix, conf_basename)
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)
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if os.path.isfile(conffile)
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]
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if candidate_confs:
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virtual_conf = candidate_confs[0]
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system_site = "true"
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# Issue 25185: Use UTF-8, as that's what the venv module uses when
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# writing the file.
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with open(virtual_conf, encoding='utf-8') as f:
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for line in f:
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if '=' in line:
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key, _, value = line.partition('=')
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key = key.strip().lower()
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value = value.strip()
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if key == 'include-system-site-packages':
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system_site = value.lower()
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elif key == 'home':
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sys._home = value
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sys.prefix = sys.exec_prefix = site_prefix
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# Doing this here ensures venv takes precedence over user-site
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|
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:
|
|
try:
|
|
import sitecustomize
|
|
except ImportError as exc:
|
|
if exc.name == 'sitecustomize':
|
|
pass
|
|
else:
|
|
raise
|
|
except Exception as err:
|
|
if sys.flags.verbose:
|
|
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:
|
|
try:
|
|
import usercustomize
|
|
except ImportError as exc:
|
|
if exc.name == 'usercustomize':
|
|
pass
|
|
else:
|
|
raise
|
|
except Exception as err:
|
|
if sys.flags.verbose:
|
|
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
|
|
|
|
orig_path = sys.path[:]
|
|
known_paths = removeduppaths()
|
|
if orig_path != sys.path:
|
|
# removeduppaths() might make sys.path absolute.
|
|
# fix __file__ and __cached__ of already imported modules too.
|
|
abs_paths()
|
|
|
|
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()
|
|
if not sys.flags.isolated:
|
|
enablerlcompleter()
|
|
execsitecustomize()
|
|
if ENABLE_USER_SITE:
|
|
execusercustomize()
|
|
|
|
# Prevent extending 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 - user 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()
|