def _find_candidates(self, requirement: Requirement) -> Iterable[Candidate]:
sources = self.get_filtered_sources(requirement)
with self.environment.get_finder(sources, True) as finder, allow_all_wheels():
cans = [
Candidate.from_installation_candidate(c, requirement)
for c in finder.find_all_candidates(requirement.project_name)
]
if not cans:
raise CandidateNotFound(
f"Unable to find candidates for {requirement.project_name}. There may "
"exist some issues with the package name or network condition."
)
return cans
def obtain(self, allow_all: bool = False) -> None:
"""Fetch the link of the candidate and unpack to local if necessary.
:param allow_all: If true, don't validate the wheel tag nor hashes
"""
ireq = self.ireq
if self.wheel:
if self._wheel_compatible(self.wheel, allow_all):
return
elif ireq.source_dir:
return
if not allow_all and self.candidate.hashes:
ireq.hash_options = convert_hashes(self.candidate.hashes)
with self.environment.get_finder(
ignore_requires_python=True) as finder:
if (not ireq.link or ireq.link.is_wheel and
not self._wheel_compatible(ireq.link.filename, allow_all)):
ireq.link = self.wheel = None # reset the incompatible wheel
with allow_all_wheels(allow_all):
ireq.link = populate_link(finder, ireq, False)
if not ireq.link:
raise CandidateNotFound("No candidate is found for %s",
self)
if not ireq.original_link:
ireq.original_link = ireq.link
if allow_all and not self.req.editable:
cached = self._get_cached_wheel()
if cached:
self.wheel = cached.file_path
return
downloader = pip_shims.Downloader(finder.session,
"off") # type: ignore
self._populate_source_dir()
if not ireq.link.is_existing_dir():
assert ireq.source_dir
downloaded = pip_shims.unpack_url( # type: ignore
ireq.link,
ireq.source_dir,
downloader,
hashes=ireq.hashes(False),
)
if ireq.link.is_wheel:
assert downloaded
self.wheel = downloaded.path
return