mirror of
https://github.com/pypa/pip
synced 2023-12-13 21:30:23 +01:00
230 lines
8 KiB
Python
230 lines
8 KiB
Python
"""Locations where we look for configs, install stuff, etc"""
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from __future__ import absolute_import
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import os
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import os.path
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import site
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import ssl
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import sys
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from distutils import sysconfig
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from distutils.command.install import install, SCHEME_KEYS # noqa
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from pip.compat import WINDOWS, expanduser
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from pip.utils import appdirs
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# if the Python we're running on is new enough to have the needed API then
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# we'll ask OpenSSL to give us the path to the default CA Bundle. If this API
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# doesn't exist or we cannot resolve the path to an existing file, then we will
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# simply set this to None. Setting this to None will have requests fall back
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# and use it's default CA Bundle logic.
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# Ever since requests 2.9.0, requests has supported a CAPath in addition to a
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# CAFile, because some systems (such as Debian) have a broken CAFile currently
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# we'll go ahead and support both, prefering CAPath over CAfile.
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if getattr(ssl, "get_default_verify_paths", None):
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_ssl_paths = ssl.get_default_verify_paths()
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# Ok, this is a little hairy because system trust stores are randomly
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# broken in different and exciting ways and this should help fix that.
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# Ideally we'd just not trust the system store, however that leads end
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# users to be confused on systems like Debian that patch python-pip, even
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# inside of a virtual environment, to support the system store. This would
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# lead to pip trusting the system store when creating the virtual
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# environment, but then switching to not doing that when upgraded to a
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# version from PyPI. However, we can't *only* rely on the system store
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# because not all systems actually have one, so at the end of the day we
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# still need to fall back to trusting the bundled copy.
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#
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# Resolution Method:
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#
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# 1. We prefer a CAPath, however we will *only* prefer a CAPath if the
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# directory exists and it is not empty. This works around systems like
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# Homebrew which have an empty CAPath but a populated CAFile.
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# 2. Failing that, we prefer a CAFile, however again we will *only* prefer
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# it if it exists on disk and if it is not empty. This will work around
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# systems that have an empty CAFile sitting around for no good reason.
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# 3. Finally, we'll just fall back to letting requests use it's bundled
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# CAFile, which can of course be overriden by the end user installing
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# certifi.
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if _ssl_paths.capath is not None and os.listdir(_ssl_paths.capath):
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CA_BUNDLE_PATH = _ssl_paths.capath
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elif _ssl_paths.cafile is not None and os.path.getsize(_ssl_paths.cafile):
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CA_BUNDLE_PATH = _ssl_paths.cafile
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else:
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CA_BUNDLE_PATH = None
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else:
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# If we aren't running on a copy of Python that is new enough to be able
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# to query OpenSSL for it's default locations, then we'll only support
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# using the built in CA Bundle by default.
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CA_BUNDLE_PATH = None
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# Application Directories
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USER_CACHE_DIR = appdirs.user_cache_dir("pip")
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DELETE_MARKER_MESSAGE = '''\
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This file is placed here by pip to indicate the source was put
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here by pip.
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Once this package is successfully installed this source code will be
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deleted (unless you remove this file).
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'''
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PIP_DELETE_MARKER_FILENAME = 'pip-delete-this-directory.txt'
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def write_delete_marker_file(directory):
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"""
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Write the pip delete marker file into this directory.
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"""
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filepath = os.path.join(directory, PIP_DELETE_MARKER_FILENAME)
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with open(filepath, 'w') as marker_fp:
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marker_fp.write(DELETE_MARKER_MESSAGE)
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def running_under_virtualenv():
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"""
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Return True if we're running inside a virtualenv, False otherwise.
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"""
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if hasattr(sys, 'real_prefix'):
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return True
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elif sys.prefix != getattr(sys, "base_prefix", sys.prefix):
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return True
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return False
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def virtualenv_no_global():
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"""
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Return True if in a venv and no system site packages.
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"""
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# this mirrors the logic in virtualenv.py for locating the
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# no-global-site-packages.txt file
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site_mod_dir = os.path.dirname(os.path.abspath(site.__file__))
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no_global_file = os.path.join(site_mod_dir, 'no-global-site-packages.txt')
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if running_under_virtualenv() and os.path.isfile(no_global_file):
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return True
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if running_under_virtualenv():
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src_prefix = os.path.join(sys.prefix, 'src')
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else:
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# FIXME: keep src in cwd for now (it is not a temporary folder)
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try:
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src_prefix = os.path.join(os.getcwd(), 'src')
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except OSError:
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# In case the current working directory has been renamed or deleted
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sys.exit(
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"The folder you are executing pip from can no longer be found."
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)
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# under Mac OS X + virtualenv sys.prefix is not properly resolved
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# it is something like /path/to/python/bin/..
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# Note: using realpath due to tmp dirs on OSX being symlinks
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src_prefix = os.path.abspath(src_prefix)
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# FIXME doesn't account for venv linked to global site-packages
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site_packages = sysconfig.get_python_lib()
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user_site = site.USER_SITE
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user_dir = expanduser('~')
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if WINDOWS:
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bin_py = os.path.join(sys.prefix, 'Scripts')
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bin_user = os.path.join(user_site, 'Scripts')
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# buildout uses 'bin' on Windows too?
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if not os.path.exists(bin_py):
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bin_py = os.path.join(sys.prefix, 'bin')
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bin_user = os.path.join(user_site, 'bin')
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config_basename = 'pip.ini'
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legacy_storage_dir = os.path.join(user_dir, 'pip')
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legacy_config_file = os.path.join(
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legacy_storage_dir,
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config_basename,
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)
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else:
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bin_py = os.path.join(sys.prefix, 'bin')
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bin_user = os.path.join(user_site, 'bin')
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config_basename = 'pip.conf'
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legacy_storage_dir = os.path.join(user_dir, '.pip')
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legacy_config_file = os.path.join(
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legacy_storage_dir,
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config_basename,
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)
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# Forcing to use /usr/local/bin for standard Mac OS X framework installs
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# Also log to ~/Library/Logs/ for use with the Console.app log viewer
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if sys.platform[:6] == 'darwin' and sys.prefix[:16] == '/System/Library/':
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bin_py = '/usr/local/bin'
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site_config_files = [
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os.path.join(path, config_basename)
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for path in appdirs.site_config_dirs('pip')
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]
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def distutils_scheme(dist_name, user=False, home=None, root=None,
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isolated=False, prefix=None):
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"""
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Return a distutils install scheme
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"""
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from distutils.dist import Distribution
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scheme = {}
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if isolated:
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extra_dist_args = {"script_args": ["--no-user-cfg"]}
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else:
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extra_dist_args = {}
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dist_args = {'name': dist_name}
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dist_args.update(extra_dist_args)
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d = Distribution(dist_args)
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d.parse_config_files()
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i = d.get_command_obj('install', create=True)
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# NOTE: setting user or home has the side-effect of creating the home dir
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# or user base for installations during finalize_options()
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# ideally, we'd prefer a scheme class that has no side-effects.
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assert not (user and prefix), "user={0} prefix={1}".format(user, prefix)
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i.user = user or i.user
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if user:
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i.prefix = ""
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i.prefix = prefix or i.prefix
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i.home = home or i.home
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i.root = root or i.root
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i.finalize_options()
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for key in SCHEME_KEYS:
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scheme[key] = getattr(i, 'install_' + key)
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# install_lib specified in setup.cfg should install *everything*
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# into there (i.e. it takes precedence over both purelib and
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# platlib). Note, i.install_lib is *always* set after
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# finalize_options(); we only want to override here if the user
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# has explicitly requested it hence going back to the config
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if 'install_lib' in d.get_option_dict('install'):
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scheme.update(dict(purelib=i.install_lib, platlib=i.install_lib))
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if running_under_virtualenv():
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scheme['headers'] = os.path.join(
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sys.prefix,
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'include',
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'site',
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'python' + sys.version[:3],
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dist_name,
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)
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if root is not None:
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path_no_drive = os.path.splitdrive(
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os.path.abspath(scheme["headers"]))[1]
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scheme["headers"] = os.path.join(
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root,
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path_no_drive[1:],
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)
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return scheme
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