mirror of https://github.com/pypa/pip
289 lines
9.2 KiB
Python
289 lines
9.2 KiB
Python
"""Handles all VCS (version control) support"""
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from __future__ import absolute_import
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import logging
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import os
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import shutil
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from pip.compat import urlparse, urllib
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from pip.exceptions import BadCommand
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from pip.utils import (display_path, backup_dir, find_command,
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rmtree, ask_path_exists)
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__all__ = ['vcs', 'get_src_requirement']
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logger = logging.getLogger(__name__)
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class VcsSupport(object):
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_registry = {}
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schemes = ['ssh', 'git', 'hg', 'bzr', 'sftp', 'svn']
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def __init__(self):
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# Register more schemes with urlparse for various version control
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# systems
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urlparse.uses_netloc.extend(self.schemes)
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# Python >= 2.7.4, 3.3 doesn't have uses_fragment
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if getattr(urlparse, 'uses_fragment', None):
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urlparse.uses_fragment.extend(self.schemes)
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super(VcsSupport, self).__init__()
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def __iter__(self):
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return self._registry.__iter__()
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@property
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def backends(self):
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return list(self._registry.values())
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@property
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def dirnames(self):
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return [backend.dirname for backend in self.backends]
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@property
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def all_schemes(self):
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schemes = []
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for backend in self.backends:
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schemes.extend(backend.schemes)
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return schemes
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def register(self, cls):
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if not hasattr(cls, 'name'):
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logger.warning('Cannot register VCS %s', cls.__name__)
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return
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if cls.name not in self._registry:
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self._registry[cls.name] = cls
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def unregister(self, cls=None, name=None):
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if name in self._registry:
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del self._registry[name]
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elif cls in self._registry.values():
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del self._registry[cls.name]
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else:
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logger.warning('Cannot unregister because no class or name given')
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def get_backend_name(self, location):
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"""
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Return the name of the version control backend if found at given
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location, e.g. vcs.get_backend_name('/path/to/vcs/checkout')
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"""
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for vc_type in self._registry.values():
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path = os.path.join(location, vc_type.dirname)
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if os.path.exists(path):
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return vc_type.name
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return None
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def get_backend(self, name):
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name = name.lower()
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if name in self._registry:
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return self._registry[name]
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def get_backend_from_location(self, location):
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vc_type = self.get_backend_name(location)
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if vc_type:
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return self.get_backend(vc_type)
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return None
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vcs = VcsSupport()
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class VersionControl(object):
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name = ''
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dirname = ''
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def __init__(self, url=None, *args, **kwargs):
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self.url = url
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self._cmd = None
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super(VersionControl, self).__init__(*args, **kwargs)
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def _filter(self, line):
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return (logging.DEBUG, line)
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def _is_local_repository(self, repo):
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"""
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posix absolute paths start with os.path.sep,
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win32 ones ones start with drive (like c:\\folder)
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"""
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drive, tail = os.path.splitdrive(repo)
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return repo.startswith(os.path.sep) or drive
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@property
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def cmd(self):
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if self._cmd is not None:
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return self._cmd
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command = find_command(self.name)
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logger.debug('Found command %r at %r', self.name, command)
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self._cmd = command
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return command
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def get_url_rev(self):
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"""
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Returns the correct repository URL and revision by parsing the given
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repository URL
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"""
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error_message = (
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"Sorry, '%s' is a malformed VCS url. "
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"The format is <vcs>+<protocol>://<url>, "
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"e.g. svn+http://myrepo/svn/MyApp#egg=MyApp"
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)
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assert '+' in self.url, error_message % self.url
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url = self.url.split('+', 1)[1]
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scheme, netloc, path, query, frag = urlparse.urlsplit(url)
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rev = None
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if '@' in path:
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path, rev = path.rsplit('@', 1)
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url = urlparse.urlunsplit((scheme, netloc, path, query, ''))
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return url, rev
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def get_info(self, location):
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"""
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Returns (url, revision), where both are strings
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"""
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assert not location.rstrip('/').endswith(self.dirname), \
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'Bad directory: %s' % location
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return self.get_url(location), self.get_revision(location)
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def normalize_url(self, url):
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"""
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Normalize a URL for comparison by unquoting it and removing any
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trailing slash.
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"""
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return urllib.unquote(url).rstrip('/')
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def compare_urls(self, url1, url2):
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"""
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Compare two repo URLs for identity, ignoring incidental differences.
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"""
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return (self.normalize_url(url1) == self.normalize_url(url2))
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def obtain(self, dest):
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"""
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Called when installing or updating an editable package, takes the
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source path of the checkout.
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"""
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raise NotImplementedError
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def switch(self, dest, url, rev_options):
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"""
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Switch the repo at ``dest`` to point to ``URL``.
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"""
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raise NotImplementedError
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def update(self, dest, rev_options):
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"""
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Update an already-existing repo to the given ``rev_options``.
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"""
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raise NotImplementedError
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def check_destination(self, dest, url, rev_options, rev_display):
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"""
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Prepare a location to receive a checkout/clone.
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Return True if the location is ready for (and requires) a
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checkout/clone, False otherwise.
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"""
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checkout = True
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prompt = False
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if os.path.exists(dest):
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checkout = False
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if os.path.exists(os.path.join(dest, self.dirname)):
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existing_url = self.get_url(dest)
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if self.compare_urls(existing_url, url):
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logger.debug(
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'%s in %s exists, and has correct URL (%s)',
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self.repo_name.title(),
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display_path(dest),
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url,
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)
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logger.info(
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'Updating %s %s%s',
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display_path(dest),
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self.repo_name,
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rev_display,
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)
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self.update(dest, rev_options)
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else:
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logger.warning(
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'%s %s in %s exists with URL %s',
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self.name,
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self.repo_name,
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display_path(dest),
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existing_url,
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)
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prompt = ('(s)witch, (i)gnore, (w)ipe, (b)ackup ',
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('s', 'i', 'w', 'b'))
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else:
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logger.warning(
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'Directory %s already exists, and is not a %s %s.',
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dest,
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self.name,
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self.repo_name,
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)
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prompt = ('(i)gnore, (w)ipe, (b)ackup ', ('i', 'w', 'b'))
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if prompt:
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logger.warning(
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'The plan is to install the %s repository %s',
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self.name,
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url,
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)
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response = ask_path_exists('What to do? %s' % prompt[0],
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prompt[1])
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if response == 's':
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logger.info(
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'Switching %s %s to %s%s',
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self.repo_name,
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display_path(dest),
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url,
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rev_display,
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)
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self.switch(dest, url, rev_options)
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elif response == 'i':
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# do nothing
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pass
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elif response == 'w':
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logger.warning('Deleting %s', display_path(dest))
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rmtree(dest)
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checkout = True
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elif response == 'b':
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dest_dir = backup_dir(dest)
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logger.warning(
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'Backing up %s to %s', display_path(dest), dest_dir,
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)
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shutil.move(dest, dest_dir)
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checkout = True
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return checkout
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def unpack(self, location):
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if os.path.exists(location):
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rmtree(location)
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self.obtain(location)
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def get_src_requirement(self, dist, location, find_tags=False):
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raise NotImplementedError
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def get_src_requirement(dist, location, find_tags):
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version_control = vcs.get_backend_from_location(location)
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if version_control:
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try:
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return version_control().get_src_requirement(dist,
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location,
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find_tags)
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except BadCommand:
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logger.warning(
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'cannot determine version of editable source in %s '
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'(%s command not found in path)',
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location,
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version_control.name,
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)
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return dist.as_requirement()
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logger.warning(
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'cannot determine version of editable source in %s (is not SVN '
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'checkout, Git clone, Mercurial clone or Bazaar branch)',
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location,
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)
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return dist.as_requirement()
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