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"""
Inspired by runtimeDependenciesHook, test that all dependencies specified
in base_requirements.txt are available in the Python environment.
"""
import importlib.metadata
import re
import sys
from argparse import ArgumentParser
from pathlib import Path
from packaging.requirements import Requirement
argparser = ArgumentParser()
argparser.add_argument(
"base_requirements", help="Path to the base_requirements.txt file"
)
def error(msg: str) -> None:
print(f" - {msg}", file=sys.stderr)
def normalize_name(name: str) -> str:
"""
Normalize package names according to PEP503
"""
return re.sub(r"[-_.]+", "-", name).lower()
def test_requirement(requirement: Requirement) -> bool:
"""
Given a requirement specification, tests whether the dependency can
be resolved in the local environment, and whether it satisfies the
specified version constraints.
"""
if requirement.marker and not requirement.marker.evaluate():
# ignore requirements with incompatible markers
return True
package_name = normalize_name(requirement.name)
try:
package = importlib.metadata.distribution(requirement.name)
except importlib.metadata.PackageNotFoundError:
error(f"{package_name} not installed")
return False
# Allow prereleases, to give to give us some wiggle-room
requirement.specifier.prereleases = True
if requirement.specifier and package.version not in requirement.specifier:
error(
f"{package_name}{requirement.specifier} not satisfied "
f"by version {package.version}"
)
return False
return True
def get_requirements(base_requirements: Path) -> list[Requirement]:
return [
Requirement(requirement.strip())
for requirement in base_requirements.read_text().splitlines()
if requirement.strip() != ""
and not requirement.startswith("#")
# Documentation building
and not requirement.startswith(("mkdocs", "zensical"))
]
if __name__ == "__main__":
args = argparser.parse_args()
requirements = get_requirements(Path(args.base_requirements))
tests = [test_requirement(requirement) for requirement in requirements]
if not all(tests):
sys.exit(1)
|
