233 lines
7.4 KiB
Python
233 lines
7.4 KiB
Python
import sys
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import importlib
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import argparse
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import functools
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import traceback
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import contextlib
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from io import StringIO
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import subprocess
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import pathlib
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import re
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import email.parser
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print_err = functools.partial(print, file=sys.stderr)
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# Some valid Python version specifiers are not supported.
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# Whitelist characters we can handle.
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VERSION_RE = re.compile('[a-zA-Z0-9.-]+')
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class EndPass(Exception):
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"""End current pass of generating requirements"""
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try:
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import pytoml
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from packaging.requirements import Requirement, InvalidRequirement
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from packaging.version import Version
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from packaging.utils import canonicalize_name, canonicalize_version
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import pip
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except ImportError as e:
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print_err('Import error:', e)
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# already echoed by the %pyproject_buildrequires macro
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sys.exit(0)
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@contextlib.contextmanager
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def hook_call():
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captured_out = StringIO()
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with contextlib.redirect_stdout(captured_out):
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yield
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for line in captured_out.getvalue().splitlines():
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print_err('HOOK STDOUT:', line)
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class Requirements:
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"""Requirement printer"""
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def __init__(self, freeze_output):
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self.installed_packages = {}
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for line in freeze_output.splitlines():
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line = line.strip()
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if line.startswith('#'):
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continue
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name, version = line.split('==')
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self.installed_packages[name.strip()] = Version(version)
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self.missing_requirements = False
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def add(self, requirement_str, *, source=None):
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"""Output a Python-style requirement string as RPM dep"""
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print_err(f'Handling {requirement_str} from {source}')
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try:
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requirement = Requirement(requirement_str)
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except InvalidRequirement as e:
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print_err(
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f'"WARNING: Skipping invalid requirement: {requirement_str}\n'
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+ f' {e}',
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)
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return
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name = canonicalize_name(requirement.name)
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if (requirement.marker is not None
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and not requirement.marker.evaluate(environment={'extra': ''})
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):
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print_err(f'Ignoring alien requirement:', requirement_str)
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return
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installed = self.installed_packages.get(requirement.name)
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if installed and installed in requirement.specifier:
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print_err(f'Requirement satisfied: {requirement_str}')
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print_err(f' (installed: {requirement.name} {installed})')
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else:
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self.missing_requirements = True
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together = []
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for specifier in sorted(
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requirement.specifier,
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key=lambda s: (s.operator, s.version),
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):
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version = canonicalize_version(specifier.version)
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if not VERSION_RE.fullmatch(str(specifier.version)):
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raise ValueError(
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f'Unknown character in version: {specifier.version}. '
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+ '(This is probably a bug in pyproject-rpm-macros.)',
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)
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if specifier.operator == "!=":
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lower = python3dist(name, '<', version)
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higher = python3dist(name, '>', f'{version}.0')
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together.append(
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f"({lower} or {higher})"
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)
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else:
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together.append(python3dist(name, specifier.operator, version))
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if len(together) == 0:
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print(python3dist(name))
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elif len(together) == 1:
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print(together[0])
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else:
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print(f"({' and '.join(together)})")
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def check(self, *, source=None):
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"""End current pass if any unsatisfied dependencies were output"""
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if self.missing_requirements:
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print_err(f'Exiting dependency generation pass: {source}')
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raise EndPass(source)
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def extend(self, requirement_strs, *, source=None):
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"""add() several requirements"""
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for req_str in requirement_strs:
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self.add(req_str, source=source)
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def get_backend(requirements):
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try:
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f = open('pyproject.toml')
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except FileNotFoundError:
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pyproject_data = {}
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else:
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with f:
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pyproject_data = pytoml.load(f)
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buildsystem_data = pyproject_data.get("build-system", {})
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requirements.extend(
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buildsystem_data.get("requires", ()),
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source='build-system.requires',
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)
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backend_name = buildsystem_data.get('build-backend')
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if not backend_name:
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requirements.add("setuptools >= 40.8", source='default build backend')
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requirements.add("wheel", source='default build backend')
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backend_name = 'setuptools.build_meta'
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requirements.check(source='build backend')
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backend_path = buildsystem_data.get('backend-path')
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if backend_path:
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sys.path.insert(0, backend_path)
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return importlib.import_module(backend_name)
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def generate_build_requirements(backend, requirements):
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get_requires = getattr(backend, "get_requires_for_build_wheel", None)
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if get_requires:
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with hook_call():
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new_reqs = get_requires()
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requirements.extend(new_reqs, source='get_requires_for_build_wheel')
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def generate_run_requirements(backend, requirements):
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prepare_metadata = getattr(backend, "prepare_metadata_for_build_wheel", None)
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if not prepare_metadata:
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raise ValueError(
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'build backend cannot provide build metadata '
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+ '(incl. runtime requirements) before buld'
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)
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with hook_call():
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dir_basename = prepare_metadata('.')
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with open(dir_basename + '/METADATA') as f:
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message = email.parser.Parser().parse(f, headersonly=True)
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for key in 'Requires', 'Requires-Dist':
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requires = message.get_all(key, ())
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requirements.extend(requires, source=f'wheel metadata: {key}')
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def python3dist(name, op=None, version=None):
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if op is None:
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if version is not None:
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raise AssertionError('op and version go together')
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return f'python3dist({name})'
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else:
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return f'python3dist({name}) {op} {version}'
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def generate_requires(freeze_output, *, include_runtime=False, toxenv=None):
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requirements = Requirements(freeze_output)
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try:
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backend = get_backend(requirements)
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generate_build_requirements(backend, requirements)
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if include_runtime:
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generate_run_requirements(backend, requirements)
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except EndPass:
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return
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def main(argv):
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parser = argparse.ArgumentParser(
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description='Generate BuildRequires for a Python project.'
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)
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parser.add_argument(
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'-r', '--runtime', action='store_true',
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help='Generate run-time requirements (not implemented)',
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)
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parser.add_argument(
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'-t', '--toxenv', metavar='TOXENVS',
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help='generate test tequirements from tox environment '
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+ '(not implemented; implies --runtime)',
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)
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args = parser.parse_args(argv)
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if args.toxenv:
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args.runtime = True
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print_err('--toxenv is not implemented')
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exit(1)
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freeze_output = subprocess.run(
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[sys.executable, '-I', '-m', 'pip', 'freeze', '--all'],
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encoding='utf-8',
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stdout=subprocess.PIPE,
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check=True,
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).stdout
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try:
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generate_requires(freeze_output, include_runtime=args.runtime)
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except Exception as e:
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# Log the traceback explicitly (it's useful debug info)
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traceback.print_exc()
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exit(1)
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if __name__ == '__main__':
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main(sys.argv[1:])
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