Replace Apache license headers with SPDX ID

examples/hotrod/main.go

@@ -1,5 +1,6 @@
 // Copyright (c) 2019 The Jaeger Authors.
 // Copyright (c) 2017 Uber Technologies, Inc.
+// SPDX-License-Identifier: Apache-2.0
 
 package main
 

internal/safeexpvar/safeexpvar_test.go

@@ -1,5 +1,5 @@
 // Copyright (c) 2024 The Jaeger Authors.
-// Licensed under the Apache License, Version 2.0 (the "License");
+// SPDX-License-Identifier: Apache-2.0
 
 package safeexpvar
 

scripts/replace_license_headers.py

@@ -0,0 +1,57 @@
+#!/usr/bin/env python3
+# Copyright (c) 2024 The Jaeger Authors.
+# SPDX-License-Identifier: Apache-2.0
+
+# Replace Apache 2.0 license headers with SPDX license identifiers.
+
+import re
+import sys
+
+def replace_license_header(file_path, dry_run=False):
+    with open(file_path, 'r') as file:
+        content = file.read()
+
+    # Pattern to match the entire old header, including multiple copyright lines
+    header_pattern = re.compile(r'(?s)^(// Copyright.*?(?:\n// Copyright.*?)*\n//\n// Licensed under the Apache License.*?limitations under the License\.)\s*\n')
+
+    match = header_pattern.match(content)
+    if match:
+        old_header = match.group(1)
+        if "SPDX-License-Identifier: Apache-2.0" in old_header:
+            print(f"Skipping {file_path}: SPDX identifier already present")
+            return False
+
+        if dry_run:
+            print(f"Would update {file_path}")
+            return True
+
+        # Preserve all copyright lines and add SPDX identifier
+        copyright_lines = re.findall(r'// Copyright.*', old_header)
+        new_header = "\n".join(copyright_lines) + "\n// SPDX-License-Identifier: Apache-2.0\n\n"
+
+        new_content = header_pattern.sub(new_header, content, count=1)
+
+        with open(file_path, 'w') as file:
+            file.write(new_content)
+        print(f"Updated {file_path}")
+        return True
+    else:
+        print(f"Warning: {file_path} - Could not find expected license header")
+        return False
+
+def main():
+    dry_run = '--dry-run' in sys.argv
+    files = [f for f in sys.argv[1:] if f != '--dry-run']
+
+    if not files:
+        print("Usage: python replace_license_headers.py [--dry-run] <file> [<file> ...]")
+        sys.exit(1)
+
+    if dry_run:
+        print("Performing dry run - no files will be modified")
+
+    total_updated = sum(replace_license_header(file, dry_run) for file in files)
+    print(f"Total files {'that would be' if dry_run else ''} updated: {total_updated}")
+
+if __name__ == "__main__":
+    main()