395 lines
14 KiB
Python
395 lines
14 KiB
Python
import os
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import sys
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import importlib.metadata
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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 json
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import subprocess
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import re
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import tempfile
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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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from packaging.requirements import Requirement, InvalidRequirement
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from packaging.utils import canonicalize_name, canonicalize_version
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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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# uses packaging, needs to be imported after packaging is verified to be present
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from pyproject_convert import convert
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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, get_installed_version, extras=None,
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generate_extras=False, python3_pkgversion='3'):
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self.get_installed_version = get_installed_version
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self.extras = set()
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if extras:
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for extra in extras:
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self.add_extras(*extra.split(','))
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self.missing_requirements = False
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self.generate_extras = generate_extras
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self.python3_pkgversion = python3_pkgversion
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def add_extras(self, *extras):
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self.extras |= set(e.strip() for e in extras)
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@property
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def marker_envs(self):
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if self.extras:
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return [{'extra': e} for e in sorted(self.extras)]
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return [{'extra': ''}]
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def evaluate_all_environamnets(self, requirement):
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for marker_env in self.marker_envs:
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if requirement.marker.evaluate(environment=marker_env):
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return True
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return 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 and
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not self.evaluate_all_environamnets(requirement)):
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print_err(f'Ignoring alien requirement:', requirement_str)
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return
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try:
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# TODO: check if requirements with extras are satisfied
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installed = self.get_installed_version(requirement.name)
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except importlib.metadata.PackageNotFoundError:
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print_err(f'Requirement not satisfied: {requirement_str}')
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installed = None
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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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if requirement.extras:
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print_err(f' (extras are currently not checked)')
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else:
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self.missing_requirements = True
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if self.generate_extras:
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extra_names = [f'{name}[{extra.lower()}]' for extra in sorted(requirement.extras)]
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else:
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extra_names = []
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for name in [name] + extra_names:
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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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together.append(convert(python3dist(name, python3_pkgversion=self.python3_pkgversion),
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specifier.operator, version))
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if len(together) == 0:
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print(python3dist(name,
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python3_pkgversion=self.python3_pkgversion))
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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"({' with '.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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try:
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# lazy import toml here, not needed without pyproject.toml
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import toml
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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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with f:
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pyproject_data = toml.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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# https://www.python.org/dev/peps/pep-0517/:
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# If the pyproject.toml file is absent, or the build-backend key is
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# missing, the source tree is not using this specification, and tools
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# should revert to the legacy behaviour of running setup.py
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# (either directly, or by implicitly invoking the [following] backend).
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backend_name = 'setuptools.build_meta:__legacy__'
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# Note: For projects without pyproject.toml, this was already echoed
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# by the %pyproject_buildrequires macro, but this also handles cases
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# with pyproject.toml without a specified build backend.
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# If the default requirements change, also change them in the macro!
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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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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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# PEP 517 example shows the path as a list, but some projects don't follow that
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if isinstance(backend_path, str):
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backend_path = [backend_path]
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sys.path = backend_path + sys.path
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module_name, _, object_name = backend_name.partition(":")
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backend_module = importlib.import_module(module_name)
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if object_name:
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return getattr(backend_module, object_name)
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return backend_module
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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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requirements.check(source='get_requires_for_build_wheel')
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def generate_run_requirements(backend, requirements):
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hook_name = 'prepare_metadata_for_build_wheel'
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prepare_metadata = getattr(backend, hook_name, 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 build'
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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 parse_tox_requires_lines(lines):
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packages = []
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for line in lines:
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line = line.strip()
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if line.startswith('-r'):
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path = line[2:]
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with open(path) as f:
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packages.extend(parse_tox_requires_lines(f.read().splitlines()))
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elif line.startswith('-'):
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print_err(
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f'WARNING: Skipping dependency line: {line}\n'
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+ f' tox deps options other than -r are not supported (yet).',
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)
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elif line:
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packages.append(line)
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return packages
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def generate_tox_requirements(toxenv, requirements):
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toxenv = ','.join(toxenv)
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requirements.add('tox-current-env >= 0.0.6', source='tox itself')
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requirements.check(source='tox itself')
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with tempfile.NamedTemporaryFile('r') as deps, \
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tempfile.NamedTemporaryFile('r') as extras, \
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tempfile.NamedTemporaryFile('r') as provision:
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r = subprocess.run(
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[sys.executable, '-m', 'tox',
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'--print-deps-to', deps.name,
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'--print-extras-to', extras.name,
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'--no-provision', provision.name,
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'-qre', toxenv],
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check=False,
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encoding='utf-8',
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT,
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)
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if r.stdout:
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print_err(r.stdout, end='')
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provision_content = provision.read()
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if provision_content and r.returncode != 0:
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provision_requires = json.loads(provision_content)
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if 'minversion' in provision_requires:
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requirements.add(f'tox >= {provision_requires["minversion"]}',
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source='tox provision (minversion)')
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if 'requires' in provision_requires:
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requirements.extend(provision_requires["requires"],
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source='tox provision (requires)')
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requirements.check(source='tox provision') # this terminates the script
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raise RuntimeError(
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'Dependencies requested by tox provisioning appear installed, '
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'but tox disagreed.')
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else:
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r.check_returncode()
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deplines = deps.read().splitlines()
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packages = parse_tox_requires_lines(deplines)
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requirements.add_extras(*extras.read().splitlines())
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requirements.extend(packages,
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source=f'tox --print-deps-only: {toxenv}')
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def python3dist(name, op=None, version=None, python3_pkgversion="3"):
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prefix = f"python{python3_pkgversion}dist"
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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'{prefix}({name})'
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else:
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return f'{prefix}({name}) {op} {version}'
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def generate_requires(
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*, include_runtime=False, toxenv=None, extras=None,
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get_installed_version=importlib.metadata.version, # for dep injection
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generate_extras=False, python3_pkgversion="3",
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):
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"""Generate the BuildRequires for the project in the current directory
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This is the main Python entry point.
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"""
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requirements = Requirements(
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get_installed_version, extras=extras or [],
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generate_extras=generate_extras,
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python3_pkgversion=python3_pkgversion
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)
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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 toxenv:
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include_runtime = True
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generate_tox_requirements(toxenv, 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',
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)
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parser.add_argument(
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'-e', '--toxenv', metavar='TOXENVS', action='append',
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help=('specify tox environments (comma separated and/or repeated)'
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'(implies --tox)'),
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)
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parser.add_argument(
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'-t', '--tox', action='store_true',
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help=('generate test tequirements from tox environment '
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'(implies --runtime)'),
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)
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parser.add_argument(
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'-x', '--extras', metavar='EXTRAS', action='append',
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help='comma separated list of "extras" for runtime requirements '
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'(e.g. -x testing,feature-x) (implies --runtime, can be repeated)',
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)
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parser.add_argument(
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'--generate-extras', action='store_true',
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help='Generate build requirements on Python Extras',
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)
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parser.add_argument(
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'-p', '--python3_pkgversion', metavar='PYTHON3_PKGVERSION',
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default="3", help=('Python version for pythonXdist()'
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'or pythonX.Ydist() requirements'),
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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.tox = True
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if args.tox:
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args.runtime = True
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if not args.toxenv:
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_default = f'py{sys.version_info.major}{sys.version_info.minor}'
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args.toxenv = [os.getenv('RPM_TOXENV', _default)]
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if args.extras:
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args.runtime = True
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try:
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generate_requires(
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include_runtime=args.runtime,
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toxenv=args.toxenv,
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extras=args.extras,
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generate_extras=args.generate_extras,
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python3_pkgversion=args.python3_pkgversion,
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)
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except Exception:
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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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