Generate run-time requirements for tests

macros.pyproject

@@ -17,12 +17,14 @@ if [ -d %{buildroot}%{python3_sitearch} ]; then
 fi
 }
 
-%pyproject_buildrequires() %{expand:\\\
+%pyproject_buildrequires(r) %{expand:\\\
 echo 'python3-devel'
 echo 'python3dist(packaging)'
 echo 'python3dist(pip) >= 19'
 echo 'python3dist(pytoml)'
+# setuptools assumes no pre-existing dist-info
+rm -rfv *.dist-info/
 if [ -f %{__python3} ]; then
-  %{__python3} -I %{_rpmconfigdir}/redhat/pyproject_buildrequires.py %{?*}
+  %{__python3} -I %{_rpmconfigdir}/redhat/pyproject_buildrequires.py %{?**}
 fi
 }

pyproject-rpm-macros.spec

@@ -34,6 +34,8 @@ BuildRequires: python3dist(pyyaml)
 BuildRequires: python3dist(packaging)
 BuildRequires: python3dist(pytoml)
 BuildRequires: python3dist(pip)
+BuildRequires: python3dist(setuptools)
+BuildRequires: python3dist(wheel)
 %endif
 
 

pyproject_buildrequires.py

@@ -8,6 +8,7 @@ from io import StringIO
 import subprocess
 import pathlib
 import re
+import email.parser
 
 print_err = functools.partial(print, file=sys.stderr)
 
@@ -83,7 +84,6 @@ class Requirements:
             key=lambda s: (s.operator, s.version),
         ):
             version = canonicalize_version(specifier.version)
-            print_err(version)
             if not VERSION_RE.fullmatch(str(specifier.version)):
                 raise ValueError(
                     f'Unknown character in version: {specifier.version}. '
@@ -154,6 +154,22 @@ def generate_build_requirements(backend, requirements):
         requirements.extend(new_reqs, source='get_requires_for_build_wheel')
 
 
+def generate_run_requirements(backend, requirements):
+    prepare_metadata = getattr(backend, "prepare_metadata_for_build_wheel", None)
+    if not prepare_metadata:
+        raise ValueError(
+            'build backend cannot provide build metadata '
+            + '(incl. runtime requirements) before buld'
+        )
+    with hook_call():
+        dir_basename = prepare_metadata('.')
+    with open(dir_basename + '/METADATA') as f:
+        message = email.parser.Parser().parse(f, headersonly=True)
+    for key in 'Requires', 'Requires-Dist':
+        requires = message.get_all(key, ())
+        requirements.extend(requires, source=f'wheel metadata: {key}')
+
+
 def python3dist(name, op=None, version=None):
     if op is None:
         if version is not None:
@@ -163,12 +179,14 @@ def python3dist(name, op=None, version=None):
         return f'python3dist({name}) {op} {version}'
 
 
-def generate_requires(freeze_output):
+def generate_requires(freeze_output, *, include_runtime=False, toxenv=None):
     requirements = Requirements(freeze_output)
 
     try:
         backend = get_backend(requirements)
         generate_build_requirements(backend, requirements)
+        if include_runtime:
+            generate_run_requirements(backend, requirements)
     except EndPass:
         return
 
@@ -178,11 +196,11 @@ def main(argv):
         description='Generate BuildRequires for a Python project.'
     )
     parser.add_argument(
-        '--runtime', action='store_true',
+        '-r', '--runtime', action='store_true',
         help='Generate run-time requirements (not implemented)',
     )
     parser.add_argument(
-        '--toxenv', metavar='TOXENVS',
+        '-t', '--toxenv', metavar='TOXENVS',
         help='generate test tequirements from tox environment '
             + '(not implemented; implies --runtime)',
     )
@@ -190,8 +208,7 @@ def main(argv):
     args = parser.parse_args(argv)
     if args.toxenv:
         args.runtime = True
-    if args.runtime:
-        print_err('--runtime is not implemented')
+        print_err('--toxenv is not implemented')
         exit(1)
 
     freeze_output = subprocess.run(
@@ -202,7 +219,7 @@ def main(argv):
     ).stdout
 
     try:
-        generate_requires(freeze_output)
+        generate_requires(freeze_output, include_runtime=args.runtime)
     except Exception as e:
         # Log the traceback explicitly (it's useful debug info)
         traceback.print_exc()

test_pyproject_buildrequires.py

@@ -28,10 +28,13 @@ def test_data(case_name, capsys, tmp_path, monkeypatch):
     try:
         generate_requires(
             case['freeze_output'],
+            include_runtime=case.get('include_runtime', False),
         )
     except SystemExit as e:
         assert e.code == case['result']
     except Exception as e:
+        if 'except' not in case:
+            raise
         assert type(e).__name__ == case['except']
     else:
         assert 0 == case['result']

testcases.yaml

@@ -99,7 +99,7 @@ Build system dependencies in pyproject.toml:
     python3dist(wheel)
   result: 0
 
-Default build system, dependencies in setup.py:
+Default build system, build dependencies in setup.py:
   freeze_output: |
     setuptools==50
     wheel==1
@@ -109,6 +109,7 @@ Default build system, dependencies in setup.py:
         name='test',
         version='0.1',
         setup_requires=['foo', 'bar!=2'],
+        install_requires=['inst'],
     )
   expected: |
     python3dist(setuptools) >= 40.8
@@ -117,3 +118,26 @@ Default build system, dependencies in setup.py:
     python3dist(foo)
     (python3dist(bar) < 2 or python3dist(bar) > 2.0)
   result: 0
+
+Default build system, run dependencies in setup.py:
+  freeze_output: |
+    setuptools==50
+    wheel==1
+    pyyaml==1
+  include_runtime: true
+  setup.py: |
+    from setuptools import setup
+    setup(
+        name='test',
+        version='0.1',
+        setup_requires=['pyyaml'],  # nb. setuptools will try to install this
+        install_requires=['inst > 1', 'inst2 < 3'],
+    )
+  expected: |
+    python3dist(setuptools) >= 40.8
+    python3dist(wheel)
+    python3dist(wheel)
+    python3dist(pyyaml)
+    python3dist(inst) > 1
+    python3dist(inst2) < 3
+  result: 0

tests/python-entrypoints.spec

@@ -27,7 +27,8 @@ Discover and load entry points from installed packages.
 
 
 %generate_buildrequires
-%pyproject_buildrequires
+rm -rfv *.dist-info/
+%pyproject_buildrequires -r
 
 
 %build

tests/python-pytest.spec

@@ -27,7 +27,7 @@ py.test provides simple, yet powerful testing for Python.
 
 
 %generate_buildrequires
-%pyproject_buildrequires
+%pyproject_buildrequires -r
 
 
 %build