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