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constructors.py
"""Backing implementation for InstallRequirement's various constructors The idea here is that these formed a major chunk of InstallRequirement's size so, moving them and support code dedicated to them outside of that class helps creates for better understandability for the rest of the code. These are meant to be used elsewhere within pip to create instances of InstallRequirement. """ import logging import os import re from typing import Any, Dict, Optional, Set, Tuple, Union from pip._vendor.packaging.markers import Marker from pip._vendor.packaging.requirements import InvalidRequirement, Requirement from pip._vendor.packaging.specifiers import Specifier from pip._internal.exceptions import InstallationError from pip._internal.models.index import PyPI, TestPyPI from pip._internal.models.link import Link from pip._internal.models.wheel import Wheel from pip._internal.req.req_file import ParsedRequirement from pip._internal.req.req_install import InstallRequirement from pip._internal.utils.filetypes import is_archive_file from pip._internal.utils.misc import is_installable_dir from pip._internal.utils.packaging import get_requirement from pip._internal.utils.urls import path_to_url from pip._internal.vcs import is_url, vcs __all__ = [ "install_req_from_editable", "install_req_from_line", "parse_editable", ] logger = logging.getLogger(__name__) operators = Specifier._operators.keys() def _strip_extras(path: str) -> Tuple[str, Optional[str]]: m = re.match(r"^(.+)(\[[^\]]+\])$", path) extras = None if m: path_no_extras = m.group(1) extras = m.group(2) else: path_no_extras = path return path_no_extras, extras def convert_extras(extras: Optional[str]) -> Set[str]: if not extras: return set() return get_requirement("placeholder" + extras.lower()).extras def parse_editable(editable_req: str) -> Tuple[Optional[str], str, Set[str]]: """Parses an editable requirement into: - a requirement name - an URL - extras - editable options Accepted requirements: svn+http://blahblah@rev#egg=Foobar[baz]&subdirectory=version_subdir .[some_extra] """ url = editable_req # If a file path is specified with extras, strip off the extras. url_no_extras, extras = _strip_extras(url) if os.path.isdir(url_no_extras): # Treating it as code that has already been checked out url_no_extras = path_to_url(url_no_extras) if url_no_extras.lower().startswith("file:"): package_name = Link(url_no_extras).egg_fragment if extras: return ( package_name, url_no_extras, get_requirement("placeholder" + extras.lower()).extras, ) else: return package_name, url_no_extras, set() for version_control in vcs: if url.lower().startswith(f"{version_control}:"): url = f"{version_control}+{url}" break link = Link(url) if not link.is_vcs: backends = ", ".join(vcs.all_schemes) raise InstallationError( f"{editable_req} is not a valid editable requirement. " f"It should either be a path to a local project or a VCS URL " f"(beginning with {backends})." ) package_name = link.egg_fragment if not package_name: raise InstallationError( "Could not detect requirement name for '{}', please specify one " "with #egg=your_package_name".format(editable_req) ) return package_name, url, set() def check_first_requirement_in_file(filename: str) -> None: """Check if file is parsable as a requirements file. This is heavily based on ``pkg_resources.parse_requirements``, but simplified to just check the first meaningful line. :raises InvalidRequirement: If the first meaningful line cannot be parsed as an requirement. """ with open(filename, encoding="utf-8", errors="ignore") as f: # Create a steppable iterator, so we can handle \-continuations. lines = ( line for line in (line.strip() for line in f) if line and not line.startswith("#") # Skip blank lines/comments. ) for line in lines: # Drop comments -- a hash without a space may be in a URL. if " #" in line: line = line[: line.find(" #")] # If there is a line continuation, drop it, and append the next line. if line.endswith("\\"): line = line[:-2].strip() + next(lines, "") Requirement(line) return def deduce_helpful_msg(req: str) -> str: """Returns helpful msg in case requirements file does not exist, or cannot be parsed. :params req: Requirements file path """ if not os.path.exists(req): return f" File '{req}' does not exist." msg = " The path does exist. " # Try to parse and check if it is a requirements file. try: check_first_requirement_in_file(req) except InvalidRequirement: logger.debug("Cannot parse '%s' as requirements file", req) else: msg += ( f"The argument you provided " f"({req}) appears to be a" f" requirements file. If that is the" f" case, use the '-r' flag to install" f" the packages specified within it." ) return msg class RequirementParts: def __init__( self, requirement: Optional[Requirement], link: Optional[Link], markers: Optional[Marker], extras: Set[str], ): self.requirement = requirement self.link = link self.markers = markers self.extras = extras def parse_req_from_editable(editable_req: str) -> RequirementParts: name, url, extras_override = parse_editable(editable_req) if name is not None: try: req: Optional[Requirement] = Requirement(name) except InvalidRequirement: raise InstallationError(f"Invalid requirement: '{name}'") else: req = None link = Link(url) return RequirementParts(req, link, None, extras_override) # ---- The actual constructors follow ---- def install_req_from_editable( editable_req: str, comes_from: Optional[Union[InstallRequirement, str]] = None, use_pep517: Optional[bool] = None, isolated: bool = False, options: Optional[Dict[str, Any]] = None, constraint: bool = False, user_supplied: bool = False, permit_editable_wheels: bool = False, ) -> InstallRequirement: parts = parse_req_from_editable(editable_req) return InstallRequirement( parts.requirement, comes_from=comes_from, user_supplied=user_supplied, editable=True, permit_editable_wheels=permit_editable_wheels, link=parts.link, constraint=constraint, use_pep517=use_pep517, isolated=isolated, install_options=options.get("install_options", []) if options else [], global_options=options.get("global_options", []) if options else [], hash_options=options.get("hashes", {}) if options else {}, extras=parts.extras, ) def _looks_like_path(name: str) -> bool: """Checks whether the string "looks like" a path on the filesystem. This does not check whether the target actually exists, only judge from the appearance. Returns true if any of the following conditions is true: * a path separator is found (either os.path.sep or os.path.altsep); * a dot is found (which represents the current directory). """ if os.path.sep in name: return True if os.path.altsep is not None and os.path.altsep in name: return True if name.startswith("."): return True return False def _get_url_from_path(path: str, name: str) -> Optional[str]: """ First, it checks whether a provided path is an installable directory. If it is, returns the path. If false, check if the path is an archive file (such as a .whl). The function checks if the path is a file. If false, if the path has an @, it will treat it as a PEP 440 URL requirement and return the path. """ if _looks_like_path(name) and os.path.isdir(path): if is_installable_dir(path): return path_to_url(path) # TODO: The is_installable_dir test here might not be necessary # now that it is done in load_pyproject_toml too. raise InstallationError( f"Directory {name!r} is not installable. Neither 'setup.py' " "nor 'pyproject.toml' found." ) if not is_archive_file(path): return None if os.path.isfile(path): return path_to_url(path) urlreq_parts = name.split("@", 1) if len(urlreq_parts) >= 2 and not _looks_like_path(urlreq_parts[0]): # If the path contains '@' and the part before it does not look # like a path, try to treat it as a PEP 440 URL req instead. return None logger.warning( "Requirement %r looks like a filename, but the file does not exist", name, ) return path_to_url(path) def parse_req_from_line(name: str, line_source: Optional[str]) -> RequirementParts: if is_url(name): marker_sep = "; " else: marker_sep = ";" if marker_sep in name: name, markers_as_string = name.split(marker_sep, 1) markers_as_string = markers_as_string.strip() if not markers_as_string: markers = None else: markers = Marker(markers_as_string) else: markers = None name = name.strip() req_as_string = None path = os.path.normpath(os.path.abspath(name)) link = None extras_as_string = None if is_url(name): link = Link(name) else: p, extras_as_string = _strip_extras(path) url = _get_url_from_path(p, name) if url is not None: link = Link(url) # it's a local file, dir, or url if link: # Handle relative file URLs if link.scheme == "file" and re.search(r"\.\./", link.url): link = Link(path_to_url(os.path.normpath(os.path.abspath(link.path)))) # wheel file if link.is_wheel: wheel = Wheel(link.filename) # can raise InvalidWheelFilename req_as_string = f"{wheel.name}=={wheel.version}" else: # set the req to the egg fragment. when it's not there, this # will become an 'unnamed' requirement req_as_string = link.egg_fragment # a requirement specifier else: req_as_string = name extras = convert_extras(extras_as_string) def with_source(text: str) -> str: if not line_source: return text return f"{text} (from {line_source})" def _parse_req_string(req_as_string: str) -> Requirement: try: req = get_requirement(req_as_string) except InvalidRequirement: if os.path.sep in req_as_string: add_msg = "It looks like a path." add_msg += deduce_helpful_msg(req_as_string) elif "=" in req_as_string and not any( op in req_as_string for op in operators ): add_msg = "= is not a valid operator. Did you mean == ?" else: add_msg = "" msg = with_source(f"Invalid requirement: {req_as_string!r}") if add_msg: msg += f"\nHint: {add_msg}" raise InstallationError(msg) else: # Deprecate extras after specifiers: "name>=1.0[extras]" # This currently works by accident because _strip_extras() parses # any extras in the end of the string and those are saved in # RequirementParts for spec in req.specifier: spec_str = str(spec) if spec_str.endswith("]"): msg = f"Extras after version '{spec_str}'." raise InstallationError(msg) return req if req_as_string is not None: req: Optional[Requirement] = _parse_req_string(req_as_string) else: req = None return RequirementParts(req, link, markers, extras) def install_req_from_line( name: str, comes_from: Optional[Union[str, InstallRequirement]] = None, use_pep517: Optional[bool] = None, isolated: bool = False, options: Optional[Dict[str, Any]] = None, constraint: bool = False, line_source: Optional[str] = None, user_supplied: bool = False, ) -> InstallRequirement: """Creates an InstallRequirement from a name, which might be a requirement, directory containing 'setup.py', filename, or URL. :param line_source: An optional string describing where the line is from, for logging purposes in case of an error. """ parts = parse_req_from_line(name, line_source) return InstallRequirement( parts.requirement, comes_from, link=parts.link, markers=parts.markers, use_pep517=use_pep517, isolated=isolated, install_options=options.get("install_options", []) if options else [], global_options=options.get("global_options", []) if options else [], hash_options=options.get("hashes", {}) if options else {}, constraint=constraint, extras=parts.extras, user_supplied=user_supplied, ) def install_req_from_req_string( req_string: str, comes_from: Optional[InstallRequirement] = None, isolated: bool = False, use_pep517: Optional[bool] = None, user_supplied: bool = False, ) -> InstallRequirement: try: req = get_requirement(req_string) except InvalidRequirement: raise InstallationError(f"Invalid requirement: '{req_string}'") domains_not_allowed = [ PyPI.file_storage_domain, TestPyPI.file_storage_domain, ] if ( req.url and comes_from and comes_from.link and comes_from.link.netloc in domains_not_allowed ): # Explicitly disallow pypi packages that depend on external urls raise InstallationError( "Packages installed from PyPI cannot depend on packages " "which are not also hosted on PyPI.\n" "{} depends on {} ".format(comes_from.name, req) ) return InstallRequirement( req, comes_from, isolated=isolated, use_pep517=use_pep517, user_supplied=user_supplied, ) def install_req_from_parsed_requirement( parsed_req: ParsedRequirement, isolated: bool = False, use_pep517: Optional[bool] = None, user_supplied: bool = False, ) -> InstallRequirement: if parsed_req.is_editable: req = install_req_from_editable( parsed_req.requirement, comes_from=parsed_req.comes_from, use_pep517=use_pep517, constraint=parsed_req.constraint, isolated=isolated, user_supplied=user_supplied, ) else: req = install_req_from_line( parsed_req.requirement, comes_from=parsed_req.comes_from, use_pep517=use_pep517, isolated=isolated, options=parsed_req.options, constraint=parsed_req.constraint, line_source=parsed_req.line_source, user_supplied=user_supplied, ) return req def install_req_from_link_and_ireq( link: Link, ireq: InstallRequirement ) -> InstallRequirement: return InstallRequirement( req=ireq.req, comes_from=ireq.comes_from, editable=ireq.editable, link=link, markers=ireq.markers, use_pep517=ireq.use_pep517, isolated=ireq.isolated, install_options=ireq.install_options, global_options=ireq.global_options, hash_options=ireq.hash_options, )