[OE-core][PATCH v2 25/25] scripts/contrib: Add reuse-get-license.py

[Joshua Watt <jpewhacker@gmail.com>]

Adds a script that extracts the LICENSE and LIC_FILES_CHKSUM for project
that uses reuse[1].

[1]: https://reuse.software/

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
---
 scripts/contrib/reuse-get-license.py | 106 +++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100755 scripts/contrib/reuse-get-license.py

diff --git a/scripts/contrib/reuse-get-license.py b/scripts/contrib/reuse-get-license.py
new file mode 100755
index 0000000000..f35f13fec9
--- /dev/null
+++ b/scripts/contrib/reuse-get-license.py
@@ -0,0 +1,106 @@
+#! /usr/bin/env python3
+#
+# Copyright OpenEmbedded Contributors
+#
+# SPDX-License-Identifier: MIT
+#
+# /// script
+# dependencies = [
+#   "reuse",
+#   "py-spdx-license",
+# ]
+# ///
+#
+# Extracts the LICENSE for software that uses reuse. Run with any PEP 723
+# complaint tool, e.g.
+#
+#   uv run reuse-get-license.py <project-root>
+
+import argparse
+import hashlib
+import sys
+import textwrap
+from pathlib import Path
+
+import py_spdx_license
+import reuse.project
+
+def main():
+    parser = argparse.ArgumentParser(
+        description="Generate LICENSE expression from reuse"
+    )
+    parser.add_argument("dir", help="Project root directory", type=Path)
+    parser.add_argument(
+        "--include-submodules",
+        "-s",
+        help="Include submodules",
+        action="store_true",
+    )
+    parser.add_argument(
+        "--include-meson-subprojects",
+        "-m",
+        help="Include meson subprojects",
+        action="store_true",
+    )
+    parser.add_argument(
+        "--width",
+        "-w",
+        type=int,
+        help="Maximum line width for the output. Default is %(default)s",
+        default=100,
+    )
+
+    args = parser.parse_args()
+
+    prj = reuse.project.Project.from_directory(
+        args.dir,
+        include_submodules=args.include_submodules,
+        include_meson_subprojects=args.include_meson_subprojects,
+    )
+
+    licenses = []
+    for k in prj.licenses.keys():
+        licenses.append(py_spdx_license.parse(k))
+
+    lic = py_spdx_license.AndOp.join(licenses).sort()
+
+    prefix = 'LICENSE = "'
+
+    if args.width:
+        lic_text = textwrap.wrap(
+            f'{prefix}{lic.to_string()}"',
+            width=args.width,
+            subsequent_indent=" " * len(prefix),
+        )
+    else:
+        lic_text = [prefix + lic.to_string() + '"']
+
+    print(" \\\n".join(lic_text))
+
+    tomls = reuse.project.Project.find_global_licensing(
+        args.dir,
+        include_submodules=args.include_submodules,
+        include_meson_subprojects=args.include_meson_subprojects,
+    )
+
+    checksums = []
+
+    for t in tomls:
+        h = hashlib.md5()
+        with open(t.path, "rb") as f:
+            while b := f.read(4096):
+                h.update(b)
+
+        rel_path = Path(t.path).relative_to(args.dir)
+        checksums.append(f"file://{rel_path};md5={h.hexdigest()}")
+
+    if checksums:
+        checksums.sort()
+        prefix = 'LIC_FILES_CHKSUM = "'
+        print(prefix + (" \\\n" + " " * len(prefix)).join(checksums) + '"')
+
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())
-- 
2.54.0