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"""Handles all VCS (version control) support"""
# The following comment should be removed at some point in the future.
# mypy: disallow-untyped-defs=False
from __future__ import absolute_import
import errno
import logging
import os
import shutil
import sys
from pip._vendor import pkg_resources
from pip._vendor.six.moves.urllib import parse as urllib_parse
from pip._internal.exceptions import BadCommand
from pip._internal.utils.compat import samefile
from pip._internal.utils.misc import (
ask_path_exists,
backup_dir,
display_path,
hide_url,
hide_value,
rmtree,
)
from pip._internal.utils.subprocess import call_subprocess, make_command
from pip._internal.utils.typing import MYPY_CHECK_RUNNING
from pip._internal.utils.urls import get_url_scheme
if MYPY_CHECK_RUNNING:
from typing import (
Any, Dict, Iterable, List, Mapping, Optional, Text, Tuple, Type, Union
)
from pip._internal.utils.ui import SpinnerInterface
from pip._internal.utils.misc import HiddenText
from pip._internal.utils.subprocess import CommandArgs
AuthInfo = Tuple[Optional[str], Optional[str]]
__all__ = ['vcs']
logger = logging.getLogger(__name__)
def is_url(name):
# type: (Union[str, Text]) -> bool
"""
Return true if the name looks like a URL.
"""
scheme = get_url_scheme(name)
if scheme is None:
return False
return scheme in ['http', 'https', 'file', 'ftp'] + vcs.all_schemes
def make_vcs_requirement_url(repo_url, rev, project_name, subdir=None):
"""
Return the URL for a VCS requirement.
Args:
repo_url: the remote VCS url, with any needed VCS prefix (e.g. "git+").
project_name: the (unescaped) project name.
"""
egg_project_name = pkg_resources.to_filename(project_name)
req = '{}@{}#egg={}'.format(repo_url, rev, egg_project_name)
if subdir:
req += '&subdirectory={}'.format(subdir)
return req
def find_path_to_setup_from_repo_root(location, repo_root):
"""
Find the path to `setup.py` by searching up the filesystem from `location`.
Return the path to `setup.py` relative to `repo_root`.
Return None if `setup.py` is in `repo_root` or cannot be found.
"""
# find setup.py
orig_location = location
while not os.path.exists(os.path.join(location, 'setup.py')):
last_location = location
location = os.path.dirname(location)
if location == last_location:
# We've traversed up to the root of the filesystem without
# finding setup.py
logger.warning(
"Could not find setup.py for directory %s (tried all "
"parent directories)",
orig_location,
)
return None
if samefile(repo_root, location):
return None
return os.path.relpath(location, repo_root)
class RemoteNotFoundError(Exception):
pass
class RevOptions(object):
"""
Encapsulates a VCS-specific revision to install, along with any VCS
install options.
Instances of this class should be treated as if immutable.
"""
def __init__(
self,
vc_class, # type: Type[VersionControl]
rev=None, # type: Optional[str]
extra_args=None, # type: Optional[CommandArgs]
):
# type: (...) -> None
"""
Args:
vc_class: a VersionControl subclass.
rev: the name of the revision to install.
extra_args: a list of extra options.
"""
if extra_args is None:
extra_args = []
self.extra_args = extra_args
self.rev = rev
self.vc_class = vc_class
self.branch_name = None # type: Optional[str]
def __repr__(self):
return '<RevOptions {}: rev={!r}>'.format(self.vc_class.name, self.rev)
@property
def arg_rev(self):
# type: () -> Optional[str]
if self.rev is None:
return self.vc_class.default_arg_rev
return self.rev
def to_args(self):
# type: () -> CommandArgs
"""
Return the VCS-specific command arguments.
"""
args = [] # type: CommandArgs
rev = self.arg_rev
if rev is not None:
args += self.vc_class.get_base_rev_args(rev)
args += self.extra_args
return args
def to_display(self):
# type: () -> str
if not self.rev:
return ''
return ' (to revision {})'.format(self.rev)
def make_new(self, rev):
# type: (str) -> RevOptions
"""
Make a copy of the current instance, but with a new rev.
Args:
rev: the name of the revision for the new object.
"""
return self.vc_class.make_rev_options(rev, extra_args=self.extra_args)
class VcsSupport(object):
_registry = {} # type: Dict[str, VersionControl]
schemes = ['ssh', 'git', 'hg', 'bzr', 'sftp', 'svn']
def __init__(self):
# type: () -> None
# Register more schemes with urlparse for various version control
# systems
urllib_parse.uses_netloc.extend(self.schemes)
# Python >= 2.7.4, 3.3 doesn't have uses_fragment
if getattr(urllib_parse, 'uses_fragment', None):
urllib_parse.uses_fragment.extend(self.schemes)
super(VcsSupport, self).__init__()
def __iter__(self):
return self._registry.__iter__()
@property
def backends(self):
# type: () -> List[VersionControl]
return list(self._registry.values())
@property
def dirnames(self):
# type: () -> List[str]
return [backend.dirname for backend in self.backends]
@property
def all_schemes(self):
# type: () -> List[str]
schemes = [] # type: List[str]
for backend in self.backends:
schemes.extend(backend.schemes)
return schemes
def register(self, cls):
# type: (Type[VersionControl]) -> None
if not hasattr(cls, 'name'):
logger.warning('Cannot register VCS %s', cls.__name__)
return
if cls.name not in self._registry:
self._registry[cls.name] = cls()
logger.debug('Registered VCS backend: %s', cls.name)
def unregister(self, name):
# type: (str) -> None
if name in self._registry:
del self._registry[name]
def get_backend_for_dir(self, location):
# type: (str) -> Optional[VersionControl]
"""
Return a VersionControl object if a repository of that type is found
at the given directory.
"""
for vcs_backend in self._registry.values():
if vcs_backend.controls_location(location):
logger.debug('Determine that %s uses VCS: %s',
location, vcs_backend.name)
return vcs_backend
return None
def get_backend(self, name):
# type: (str) -> Optional[VersionControl]
"""
Return a VersionControl object or None.
"""
name = name.lower()
return self._registry.get(name)
vcs = VcsSupport()
class VersionControl(object):
name = ''
dirname = ''
repo_name = ''
# List of supported schemes for this Version Control
schemes = () # type: Tuple[str, ...]
# Iterable of environment variable names to pass to call_subprocess().
unset_environ = () # type: Tuple[str, ...]
default_arg_rev = None # type: Optional[str]
@classmethod
def should_add_vcs_url_prefix(cls, remote_url):
"""
Return whether the vcs prefix (e.g. "git+") should be added to a
repository's remote url when used in a requirement.
"""
return not remote_url.lower().startswith('{}:'.format(cls.name))
@classmethod
def get_subdirectory(cls, location):
"""
Return the path to setup.py, relative to the repo root.
Return None if setup.py is in the repo root.
"""
return None
@classmethod
def get_requirement_revision(cls, repo_dir):
"""
Return the revision string that should be used in a requirement.
"""
return cls.get_revision(repo_dir)
@classmethod
def get_src_requirement(cls, repo_dir, project_name):
"""
Return the requirement string to use to redownload the files
currently at the given repository directory.
Args:
project_name: the (unescaped) project name.
The return value has a form similar to the following:
{repository_url}@{revision}#egg={project_name}
"""
repo_url = cls.get_remote_url(repo_dir)
if repo_url is None:
return None
if cls.should_add_vcs_url_prefix(repo_url):
repo_url = '{}+{}'.format(cls.name, repo_url)
revision = cls.get_requirement_revision(repo_dir)
subdir = cls.get_subdirectory(repo_dir)
req = make_vcs_requirement_url(repo_url, revision, project_name,
subdir=subdir)
return req
@staticmethod
def get_base_rev_args(rev):
"""
Return the base revision arguments for a vcs command.
Args:
rev: the name of a revision to install. Cannot be None.
"""
raise NotImplementedError
@classmethod
def make_rev_options(cls, rev=None, extra_args=None):
# type: (Optional[str], Optional[CommandArgs]) -> RevOptions
"""
Return a RevOptions object.
Args:
rev: the name of a revision to install.
extra_args: a list of extra options.
"""
return RevOptions(cls, rev, extra_args=extra_args)
@classmethod
def _is_local_repository(cls, repo):
# type: (str) -> bool
"""
posix absolute paths start with os.path.sep,
win32 ones start with drive (like c:\\folder)
"""
drive, tail = os.path.splitdrive(repo)
return repo.startswith(os.path.sep) or bool(drive)
def export(self, location, url):
# type: (str, HiddenText) -> None
"""
Export the repository at the url to the destination location
i.e. only download the files, without vcs informations
:param url: the repository URL starting with a vcs prefix.
"""
raise NotImplementedError
@classmethod
def get_netloc_and_auth(cls, netloc, scheme):
"""
Parse the repository URL's netloc, and return the new netloc to use
along with auth information.
Args:
netloc: the original repository URL netloc.
scheme: the repository URL's scheme without the vcs prefix.
This is mainly for the Subversion class to override, so that auth
information can be provided via the --username and --password options
instead of through the URL. For other subclasses like Git without
such an option, auth information must stay in the URL.
Returns: (netloc, (username, password)).
"""
return netloc, (None, None)
@classmethod
def get_url_rev_and_auth(cls, url):
# type: (str) -> Tuple[str, Optional[str], AuthInfo]
"""
Parse the repository URL to use, and return the URL, revision,
and auth info to use.
Returns: (url, rev, (username, password)).
"""
scheme, netloc, path, query, frag = urllib_parse.urlsplit(url)
if '+' not in scheme:
raise ValueError(
"Sorry, {!r} is a malformed VCS url. "
"The format is <vcs>+<protocol>://<url>, "
"e.g. svn+http://myrepo/svn/MyApp#egg=MyApp".format(url)
)
# Remove the vcs prefix.
scheme = scheme.split('+', 1)[1]
netloc, user_pass = cls.get_netloc_and_auth(netloc, scheme)
rev = None
if '@' in path:
path, rev = path.rsplit('@', 1)
url = urllib_parse.urlunsplit((scheme, netloc, path, query, ''))
return url, rev, user_pass
@staticmethod
def make_rev_args(username, password):
# type: (Optional[str], Optional[HiddenText]) -> CommandArgs
"""
Return the RevOptions "extra arguments" to use in obtain().
"""
return []
def get_url_rev_options(self, url):
# type: (HiddenText) -> Tuple[HiddenText, RevOptions]
"""
Return the URL and RevOptions object to use in obtain() and in
some cases export(), as a tuple (url, rev_options).
"""
secret_url, rev, user_pass = self.get_url_rev_and_auth(url.secret)
username, secret_password = user_pass
password = None # type: Optional[HiddenText]
if secret_password is not None:
password = hide_value(secret_password)
extra_args = self.make_rev_args(username, password)
rev_options = self.make_rev_options(rev, extra_args=extra_args)
return hide_url(secret_url), rev_options
@staticmethod
def normalize_url(url):
# type: (str) -> str
"""
Normalize a URL for comparison by unquoting it and removing any
trailing slash.
"""
return urllib_parse.unquote(url).rstrip('/')
@classmethod
def compare_urls(cls, url1, url2):
# type: (str, str) -> bool
"""
Compare two repo URLs for identity, ignoring incidental differences.
"""
return (cls.normalize_url(url1) == cls.normalize_url(url2))
def fetch_new(self, dest, url, rev_options):
# type: (str, HiddenText, RevOptions) -> None
"""
Fetch a revision from a repository, in the case that this is the
first fetch from the repository.
Args:
dest: the directory to fetch the repository to.
rev_options: a RevOptions object.
"""
raise NotImplementedError
def switch(self, dest, url, rev_options):
# type: (str, HiddenText, RevOptions) -> None
"""
Switch the repo at ``dest`` to point to ``URL``.
Args:
rev_options: a RevOptions object.
"""
raise NotImplementedError
def update(self, dest, url, rev_options):
# type: (str, HiddenText, RevOptions) -> None
"""
Update an already-existing repo to the given ``rev_options``.
Args:
rev_options: a RevOptions object.
"""
raise NotImplementedError
@classmethod
def is_commit_id_equal(cls, dest, name):
"""
Return whether the id of the current commit equals the given name.
Args:
dest: the repository directory.
name: a string name.
"""
raise NotImplementedError
def obtain(self, dest, url):
# type: (str, HiddenText) -> None
"""
Install or update in editable mode the package represented by this
VersionControl object.
:param dest: the repository directory in which to install or update.
:param url: the repository URL starting with a vcs prefix.
"""
url, rev_options = self.get_url_rev_options(url)
if not os.path.exists(dest):
self.fetch_new(dest, url, rev_options)
return
rev_display = rev_options.to_display()
if self.is_repository_directory(dest):
existing_url = self.get_remote_url(dest)
if self.compare_urls(existing_url, url.secret):
logger.debug(
'%s in %s exists, and has correct URL (%s)',
self.repo_name.title(),
display_path(dest),
url,
)
if not self.is_commit_id_equal(dest, rev_options.rev):
logger.info(
'Updating %s %s%s',
display_path(dest),
self.repo_name,
rev_display,
)
self.update(dest, url, rev_options)
else:
logger.info('Skipping because already up-to-date.')
return
logger.warning(
'%s %s in %s exists with URL %s',
self.name,
self.repo_name,
display_path(dest),
existing_url,
)
prompt = ('(s)witch, (i)gnore, (w)ipe, (b)ackup ',
('s', 'i', 'w', 'b'))
else:
logger.warning(
'Directory %s already exists, and is not a %s %s.',
dest,
self.name,
self.repo_name,
)
# https://github.com/python/mypy/issues/1174
prompt = ('(i)gnore, (w)ipe, (b)ackup ', # type: ignore
('i', 'w', 'b'))
logger.warning(
'The plan is to install the %s repository %s',
self.name,
url,
)
response = ask_path_exists('What to do? %s' % prompt[0], prompt[1])
if response == 'a':
sys.exit(-1)
if response == 'w':
logger.warning('Deleting %s', display_path(dest))
rmtree(dest)
self.fetch_new(dest, url, rev_options)
return
if response == 'b':
dest_dir = backup_dir(dest)
logger.warning(
'Backing up %s to %s', display_path(dest), dest_dir,
)
shutil.move(dest, dest_dir)
self.fetch_new(dest, url, rev_options)
return
# Do nothing if the response is "i".
if response == 's':
logger.info(
'Switching %s %s to %s%s',
self.repo_name,
display_path(dest),
url,
rev_display,
)
self.switch(dest, url, rev_options)
def unpack(self, location, url):
# type: (str, HiddenText) -> None
"""
Clean up current location and download the url repository
(and vcs infos) into location
:param url: the repository URL starting with a vcs prefix.
"""
if os.path.exists(location):
rmtree(location)
self.obtain(location, url=url)
@classmethod
def get_remote_url(cls, location):
"""
Return the url used at location
Raises RemoteNotFoundError if the repository does not have a remote
url configured.
"""
raise NotImplementedError
@classmethod
def get_revision(cls, location):
"""
Return the current commit id of the files at the given location.
"""
raise NotImplementedError
@classmethod
def run_command(
cls,
cmd, # type: Union[List[str], CommandArgs]
show_stdout=True, # type: bool
cwd=None, # type: Optional[str]
on_returncode='raise', # type: str
extra_ok_returncodes=None, # type: Optional[Iterable[int]]
command_desc=None, # type: Optional[str]
extra_environ=None, # type: Optional[Mapping[str, Any]]
spinner=None, # type: Optional[SpinnerInterface]
log_failed_cmd=True
):
# type: (...) -> Text
"""
Run a VCS subcommand
This is simply a wrapper around call_subprocess that adds the VCS
command name, and checks that the VCS is available
"""
cmd = make_command(cls.name, *cmd)
try:
return call_subprocess(cmd, show_stdout, cwd,
on_returncode=on_returncode,
extra_ok_returncodes=extra_ok_returncodes,
command_desc=command_desc,
extra_environ=extra_environ,
unset_environ=cls.unset_environ,
spinner=spinner,
log_failed_cmd=log_failed_cmd)
except OSError as e:
# errno.ENOENT = no such file or directory
# In other words, the VCS executable isn't available
if e.errno == errno.ENOENT:
raise BadCommand(
'Cannot find command %r - do you have '
'%r installed and in your '
'PATH?' % (cls.name, cls.name))
else:
raise # re-raise exception if a different error occurred
@classmethod
def is_repository_directory(cls, path):
# type: (str) -> bool
"""
Return whether a directory path is a repository directory.
"""
logger.debug('Checking in %s for %s (%s)...',
path, cls.dirname, cls.name)
return os.path.exists(os.path.join(path, cls.dirname))
@classmethod
def controls_location(cls, location):
# type: (str) -> bool
"""
Check if a location is controlled by the vcs.
It is meant to be overridden to implement smarter detection
mechanisms for specific vcs.
This can do more than is_repository_directory() alone. For example,
the Git override checks that Git is actually available.
"""
return cls.is_repository_directory(location)
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