import glob
import io
import os
import sys
import importlib.metadata
import argparse
import traceback
import contextlib
import json
import subprocess
import re
import tempfile
import email.parser
import pathlib
import zipfile
from pyproject_requirements_txt import convert_requirements_txt
# Some valid Python version specifiers are not supported.
# Allow only the forms we know we can handle.
VERSION_RE = re.compile(r'[a-zA-Z0-9.-]+(\.\*)?')
class EndPass(Exception):
"""End current pass of generating requirements"""
# nb: we don't use functools.partial to be able to use pytest's capsys
# see https://github.com/pytest-dev/pytest/issues/8900
def print_err(*args, **kwargs):
kwargs.setdefault('file', sys.stderr)
print(*args, **kwargs)
try:
from packaging.requirements import Requirement, InvalidRequirement
from packaging.utils import canonicalize_name
except ImportError as e:
print_err('Import error:', e)
# already echoed by the %pyproject_buildrequires macro
sys.exit(0)
# uses packaging, needs to be imported after packaging is verified to be present
from pyproject_convert import convert
def fake_stdout():
"""Context manager that holds a fake stdout file pointer
to be used in hook_call().
It's essential that this context manager is only used once and all
hook_call()s are called from within.
See https://bugzilla.redhat.com/2183519#c2 for rationale."""
return io.TextIOWrapper(
tempfile.TemporaryFile(buffering=0),
encoding='utf-8',
errors='replace',
write_through=True,
)
@contextlib.contextmanager
def hook_call(fp):
"""Context manager that records all stdout content (on FD level)
in the given file pointer and prints it to stderr at the end,
with a 'HOOK STDOUT: ' prefix.
Use this context manager repeatedly inside one fake_stdout()."""
stdout_fd = 1
stdout_fd_dup = os.dup(stdout_fd)
stdout_orig = sys.stdout
# begin capture
sys.stdout = fp
os.dup2(fp.fileno(), stdout_fd)
try:
yield
finally:
# end capture
sys.stdout = stdout_orig
os.dup2(stdout_fd_dup, stdout_fd)
fp.seek(0) # rewind
for line in fp:
print_err('HOOK STDOUT:', line, end='')
def guess_reason_for_invalid_requirement(requirement_str):
if ':' in requirement_str:
message = (
'It might be an URL. '
'%pyproject_buildrequires cannot handle all URL-based requirements. '
'Add PackageName@ (see PEP 508) to the URL to at least require any version of PackageName.'
)
if '@' in requirement_str:
message += ' (but note that URLs might not work well with other features)'
return message
if '/' in requirement_str:
return (
'It might be a local path. '
'%pyproject_buildrequires cannot handle local paths as requirements. '
'Use an URL with PackageName@ (see PEP 508) to at least require any version of PackageName.'
)
# No more ideas
return None
class Requirements:
"""Requirement printer"""
def __init__(self, get_installed_version, extras=None,
generate_extras=False, python3_pkgversion='3'):
self.get_installed_version = get_installed_version
self.extras = set()
if extras:
for extra in extras:
self.add_extras(*extra.split(','))
self.missing_requirements = False
self.generate_extras = generate_extras
self.python3_pkgversion = python3_pkgversion
def add_extras(self, *extras):
self.extras |= set(e.strip() for e in extras)
@property
def marker_envs(self):
if self.extras:
return [{'extra': e} for e in sorted(self.extras)]
return [{'extra': ''}]
def evaluate_all_environments(self, requirement):
for marker_env in self.marker_envs:
if requirement.marker.evaluate(environment=marker_env):
return True
return False
def add(self, requirement_str, *, source=None):
"""Output a Python-style requirement string as RPM dep"""
print_err(f'Handling {requirement_str} from {source}')
try:
requirement = Requirement(requirement_str)
except InvalidRequirement:
hint = guess_reason_for_invalid_requirement(requirement_str)
message = f'Requirement {requirement_str!r} from {source} is invalid.'
if hint:
message += f' Hint: {hint}'
raise ValueError(message)
if requirement.url:
print_err(
f'WARNING: Simplifying {requirement_str!r} to {requirement.name!r}.'
)
name = canonicalize_name(requirement.name)
if (requirement.marker is not None and
not self.evaluate_all_environments(requirement)):
print_err(f'Ignoring alien requirement:', requirement_str)
return
# We need to always accept pre-releases as satisfying the requirement
# Otherwise e.g. installed cffi version 1.15.0rc2 won't even satisfy the requirement for "cffi"
# https://bugzilla.redhat.com/show_bug.cgi?id=2014639#c3
requirement.specifier.prereleases = True
try:
# TODO: check if requirements with extras are satisfied
installed = self.get_installed_version(requirement.name)
except importlib.metadata.PackageNotFoundError:
print_err(f'Requirement not satisfied: {requirement_str}')
installed = None
if installed and installed in requirement.specifier:
print_err(f'Requirement satisfied: {requirement_str}')
print_err(f' (installed: {requirement.name} {installed})')
if requirement.extras:
print_err(f' (extras are currently not checked)')
else:
self.missing_requirements = True
if self.generate_extras:
extra_names = [f'{name}[{extra.lower()}]' for extra in sorted(requirement.extras)]
else:
extra_names = []
for name in [name] + extra_names:
together = []
for specifier in sorted(
requirement.specifier,
key=lambda s: (s.operator, s.version),
):
if not VERSION_RE.fullmatch(str(specifier.version)):
raise ValueError(
f'Unknown character in version: {specifier.version}. '
+ '(This might be a bug in pyproject-rpm-macros.)',
)
together.append(convert(python3dist(name, python3_pkgversion=self.python3_pkgversion),
specifier.operator, specifier.version))
if len(together) == 0:
print(python3dist(name,
python3_pkgversion=self.python3_pkgversion))
elif len(together) == 1:
print(together[0])
else:
print(f"({' with '.join(together)})")
def check(self, *, source=None):
"""End current pass if any unsatisfied dependencies were output"""
if self.missing_requirements:
print_err(f'Exiting dependency generation pass: {source}')
raise EndPass(source)
def extend(self, requirement_strs, **kwargs):
"""add() several requirements"""
for req_str in requirement_strs:
self.add(req_str, **kwargs)
def toml_load(opened_binary_file):
try:
# tomllib is in the standard library since 3.11.0b1
import tomllib as toml_module
load_from = opened_binary_file
except ImportError:
try:
# note: we could use tomli here,
# but for backwards compatibility with RHEL 9, we use toml instead
import toml as toml_module
load_from = io.TextIOWrapper(opened_binary_file, encoding='utf-8')
except ImportError as e:
print_err('Import error:', e)
# already echoed by the %pyproject_buildrequires macro
sys.exit(0)
return toml_module.load(load_from)
def get_backend(requirements):
try:
f = open('pyproject.toml', 'rb')
except FileNotFoundError:
pyproject_data = {}
else:
with f:
pyproject_data = toml_load(f)
buildsystem_data = pyproject_data.get('build-system', {})
requirements.extend(
buildsystem_data.get('requires', ()),
source='build-system.requires',
)
backend_name = buildsystem_data.get('build-backend')
if not backend_name:
# https://www.python.org/dev/peps/pep-0517/:
# If the pyproject.toml file is absent, or the build-backend key is
# missing, the source tree is not using this specification, and tools
# should revert to the legacy behaviour of running setup.py
# (either directly, or by implicitly invoking the [following] backend).
# If setup.py is also not present program will mimick pip's behavior
# and end with an error.
if not os.path.exists('setup.py'):
raise FileNotFoundError('File "setup.py" not found for legacy project.')
backend_name = 'setuptools.build_meta:__legacy__'
# Note: For projects without pyproject.toml, this was already echoed
# by the %pyproject_buildrequires macro, but this also handles cases
# with pyproject.toml without a specified build backend.
# If the default requirements change, also change them in the macro!
requirements.add('setuptools >= 40.8', source='default build backend')
requirements.add('wheel', source='default build backend')
requirements.check(source='build backend')
backend_path = buildsystem_data.get('backend-path')
if backend_path:
# PEP 517 example shows the path as a list, but some projects don't follow that
if isinstance(backend_path, str):
backend_path = [backend_path]
sys.path = backend_path + sys.path
module_name, _, object_name = backend_name.partition(":")
backend_module = importlib.import_module(module_name)
if object_name:
return getattr(backend_module, object_name)
return backend_module
def generate_build_requirements(backend, requirements, *, hook_stdout):
get_requires = getattr(backend, 'get_requires_for_build_wheel', None)
if get_requires:
with hook_call(hook_stdout):
new_reqs = get_requires()
requirements.extend(new_reqs, source='get_requires_for_build_wheel')
requirements.check(source='get_requires_for_build_wheel')
def requires_from_metadata_file(metadata_file):
message = email.parser.Parser().parse(metadata_file, headersonly=True)
return {k: message.get_all(k, ()) for k in ('Requires', 'Requires-Dist')}
def generate_run_requirements_hook(backend, requirements, *, hook_stdout):
hook_name = 'prepare_metadata_for_build_wheel'
prepare_metadata = getattr(backend, hook_name, None)
if not prepare_metadata:
raise ValueError(
'The build backend cannot provide build metadata '
'(incl. runtime requirements) before build. '
'Use the provisional -w flag to build the wheel and parse the metadata from it, '
'or use the -R flag not to generate runtime dependencies.'
)
with hook_call(hook_stdout):
dir_basename = prepare_metadata('.')
with open(dir_basename + '/METADATA') as metadata_file:
for key, requires in requires_from_metadata_file(metadata_file).items():
requirements.extend(requires, source=f'hook generated metadata: {key}')
def find_built_wheel(wheeldir):
wheels = glob.glob(os.path.join(wheeldir, '*.whl'))
if not wheels:
return None
if len(wheels) > 1:
raise RuntimeError('Found multiple wheels in %{_pyproject_wheeldir}, '
'this is not supported with %pyproject_buildrequires -w.')
return wheels[0]
def generate_run_requirements_wheel(backend, requirements, wheeldir):
# Reuse the wheel from the previous round of %pyproject_buildrequires (if it exists)
wheel = find_built_wheel(wheeldir)
if not wheel:
import pyproject_wheel
returncode = pyproject_wheel.build_wheel(wheeldir=wheeldir, stdout=sys.stderr)
if returncode != 0:
raise RuntimeError('Failed to build the wheel for %pyproject_buildrequires -w.')
wheel = find_built_wheel(wheeldir)
if not wheel:
raise RuntimeError('Cannot locate the built wheel for %pyproject_buildrequires -w.')
print_err(f'Reading metadata from {wheel}')
with zipfile.ZipFile(wheel) as wheelfile:
for name in wheelfile.namelist():
if name.count('/') == 1 and name.endswith('.dist-info/METADATA'):
with io.TextIOWrapper(wheelfile.open(name), encoding='utf-8') as metadata_file:
for key, requires in requires_from_metadata_file(metadata_file).items():
requirements.extend(requires, source=f'built wheel metadata: {key}')
break
else:
raise RuntimeError('Could not find *.dist-info/METADATA in built wheel.')
def generate_run_requirements(backend, requirements, *, build_wheel, wheeldir, hook_stdout):
if build_wheel:
generate_run_requirements_wheel(backend, requirements, wheeldir)
else:
generate_run_requirements_hook(backend, requirements, hook_stdout=hook_stdout)
def generate_tox_requirements(toxenv, requirements):
toxenv = ','.join(toxenv)
requirements.add('tox-current-env >= 0.0.6', source='tox itself')
requirements.check(source='tox itself')
with tempfile.NamedTemporaryFile('r') as deps, \
tempfile.NamedTemporaryFile('r') as extras, \
tempfile.NamedTemporaryFile('r') as provision:
r = subprocess.run(
[sys.executable, '-m', 'tox',
'--print-deps-to', deps.name,
'--print-extras-to', extras.name,
'--no-provision', provision.name,
'-q', '-r', '-e', toxenv],
check=False,
encoding='utf-8',
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
)
if r.stdout:
print_err(r.stdout, end='')
provision_content = provision.read()
if provision_content and r.returncode != 0:
provision_requires = json.loads(provision_content)
if 'minversion' in provision_requires:
requirements.add(f'tox >= {provision_requires["minversion"]}',
source='tox provision (minversion)')
if 'requires' in provision_requires:
requirements.extend(provision_requires["requires"],
source='tox provision (requires)')
requirements.check(source='tox provision') # this terminates the script
raise RuntimeError(
'Dependencies requested by tox provisioning appear installed, '
'but tox disagreed.')
else:
r.check_returncode()
deplines = deps.read().splitlines()
packages = convert_requirements_txt(deplines)
requirements.add_extras(*extras.read().splitlines())
requirements.extend(packages,
source=f'tox --print-deps-only: {toxenv}')
def python3dist(name, op=None, version=None, python3_pkgversion="3"):
prefix = f"python{python3_pkgversion}dist"
if op is None:
if version is not None:
raise AssertionError('op and version go together')
return f'{prefix}({name})'
else:
return f'{prefix}({name}) {op} {version}'
def generate_requires(
*, include_runtime=False, build_wheel=False, wheeldir=None, toxenv=None, extras=None,
get_installed_version=importlib.metadata.version, # for dep injection
generate_extras=False, python3_pkgversion="3", requirement_files=None, use_build_system=True
):
"""Generate the BuildRequires for the project in the current directory
This is the main Python entry point.
"""
requirements = Requirements(
get_installed_version, extras=extras or [],
generate_extras=generate_extras,
python3_pkgversion=python3_pkgversion
)
try:
if (include_runtime or toxenv) and not use_build_system:
raise ValueError('-N option cannot be used in combination with -r, -e, -t, -x options')
if requirement_files:
for req_file in requirement_files:
requirements.extend(
convert_requirements_txt(req_file, pathlib.Path(req_file.name)),
source=f'requirements file {req_file.name}'
)
requirements.check(source='all requirements files')
with fake_stdout() as hook_stdout:
if use_build_system:
backend = get_backend(requirements)
generate_build_requirements(backend, requirements, hook_stdout=hook_stdout)
if toxenv:
include_runtime = True
generate_tox_requirements(toxenv, requirements)
if include_runtime:
generate_run_requirements(backend, requirements, hook_stdout=hook_stdout,
build_wheel=build_wheel, wheeldir=wheeldir)
except EndPass:
return
def main(argv):
parser = argparse.ArgumentParser(
description='Generate BuildRequires for a Python project.',
prog='%pyproject_buildrequires',
add_help=False,
)
parser.add_argument(
'--help', action='help',
default=argparse.SUPPRESS,
help=argparse.SUPPRESS,
)
parser.add_argument(
'-r', '--runtime', action='store_true', default=True,
help=argparse.SUPPRESS, # Generate run-time requirements (backwards-compatibility only)
)
parser.add_argument(
'--generate-extras', action='store_true',
help=argparse.SUPPRESS,
)
parser.add_argument(
'-p', '--python3_pkgversion', metavar='PYTHON3_PKGVERSION',
default="3", help=argparse.SUPPRESS,
)
parser.add_argument(
'--wheeldir', metavar='PATH', default=None,
help=argparse.SUPPRESS,
)
parser.add_argument(
'-x', '--extras', metavar='EXTRAS', action='append',
help='comma separated list of "extras" for runtime requirements '
'(e.g. -x testing,feature-x) (implies --runtime, can be repeated)',
)
parser.add_argument(
'-t', '--tox', action='store_true',
help=('generate test tequirements from tox environment '
'(implies --runtime)'),
)
parser.add_argument(
'-e', '--toxenv', metavar='TOXENVS', action='append',
help=('specify tox environments (comma separated and/or repeated)'
'(implies --tox)'),
)
parser.add_argument(
'-w', '--wheel', action='store_true', default=False,
help=('Generate run-time requirements by building the wheel '
'(useful for build backends without the prepare_metadata_for_build_wheel hook)'),
)
parser.add_argument(
'-R', '--no-runtime', action='store_false', dest='runtime',
help="Don't generate run-time requirements (implied by -N)",
)
parser.add_argument(
'-N', '--no-use-build-system', dest='use_build_system',
action='store_false', help='Use -N to indicate that project does not use any build system',
)
parser.add_argument(
'requirement_files', nargs='*', type=argparse.FileType('r'),
metavar='REQUIREMENTS.TXT',
help=('Add buildrequires from file'),
)
args = parser.parse_args(argv)
if not args.use_build_system:
args.runtime = False
if args.wheel:
if not args.wheeldir:
raise ValueError('--wheeldir must be set when -w.')
if args.toxenv:
args.tox = True
if args.tox:
args.runtime = True
if not args.toxenv:
_default = f'py{sys.version_info.major}{sys.version_info.minor}'
args.toxenv = [os.getenv('RPM_TOXENV', _default)]
if args.extras:
args.runtime = True
try:
generate_requires(
include_runtime=args.runtime,
build_wheel=args.wheel,
wheeldir=args.wheeldir,
toxenv=args.toxenv,
extras=args.extras,
generate_extras=args.generate_extras,
python3_pkgversion=args.python3_pkgversion,
requirement_files=args.requirement_files,
use_build_system=args.use_build_system,
)
except Exception:
# Log the traceback explicitly (it's useful debug info)
traceback.print_exc()
exit(1)
if __name__ == '__main__':
main(sys.argv[1:])