Adding upstream version 0.9.0.upstream/0.9.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 60 insertions, 0 deletions

diff --git a/src/build/util.py b/src/build/util.py
new file mode 100644
index 0000000..6c918ce
--- /dev/null
+++ b/src/build/util.py
@@ -0,0 +1,60 @@
+# SPDX-License-Identifier: MIT
+
+import os
+import pathlib
+import sys
+import tempfile
+
+import pep517
+
+import build
+import build.env
+
+
+if sys.version_info >= (3, 8):
+    import importlib.metadata as importlib_metadata
+else:
+    import importlib_metadata
+
+
+def _project_wheel_metadata(builder: build.ProjectBuilder) -> 'importlib_metadata.PackageMetadata':
+    with tempfile.TemporaryDirectory() as tmpdir:
+        path = pathlib.Path(builder.metadata_path(tmpdir))
+        # https://github.com/python/importlib_metadata/pull/343
+        return importlib_metadata.PathDistribution(path).metadata  # type: ignore[arg-type]
+
+
+def project_wheel_metadata(
+    srcdir: build.PathType,
+    isolated: bool = True,
+) -> 'importlib_metadata.PackageMetadata':
+    """
+    Return the wheel metadata for a project.
+
+    Uses the ``prepare_metadata_for_build_wheel`` hook if available,
+    otherwise ``build_wheel``.
+
+    :param srcdir: Project source directory
+    :param isolated: Whether or not to run invoke the backend in the current
+                     environment or to create an isolated one and invoke it
+                     there.
+    """
+    builder = build.ProjectBuilder(
+        os.fspath(srcdir),
+        runner=pep517.quiet_subprocess_runner,
+    )
+
+    if not isolated:
+        return _project_wheel_metadata(builder)
+
+    with build.env.IsolatedEnvBuilder() as env:
+        builder.python_executable = env.executable
+        builder.scripts_dir = env.scripts_dir
+        env.install(builder.build_system_requires)
+        env.install(builder.get_requires_for_build('wheel'))
+        return _project_wheel_metadata(builder)
+
+
+__all__ = [
+    'project_wheel_metadata',
+]