mirror source directory structure to dest

- remove dest files that do not exist in source
- copy new files
- implement dry run

cowcopy.py

@@ -0,0 +1,82 @@
+import argparse
+from pathlib import Path
+
+
+SAFETY = 'jellyfin'
+
+def get_args():
+    parser = argparse.ArgumentParser()
+    parser.add_argument('source', type=Path)
+    parser.add_argument('dest', type=Path)
+    parser.add_argument('--dry', help='Only output changes', action="store_true")
+    return parser.parse_args()
+
+
+def main(source: Path, dest: Path, dry: bool):
+    remove_deleted_files(source, dest, dry)
+    create_new_links(source, dest, dry)
+
+def remove_deleted_files(source: Path, dest: Path, dry: bool):
+    for file in dest.iterdir():
+        if file.is_dir():
+            original_dir = source / file.name
+
+            if original_dir.is_dir():
+                remove_deleted_files(original_dir, file, dry)
+            else:
+                remove_deleted_files(original_dir, file, dry)
+                if dry:
+                    print(f"Remove directory: {file}")
+                else:
+                    file.rmdir() # will fail if files have since been created
+        elif file.is_file():
+            original_file = source / file.name
+
+            if not original_file.exists() or original_file.is_dir():
+                if SAFETY not in str(file):
+                    raise Exception("Deletion path does not include jellyfin")
+                if dry:
+                    print(f"Remove file: {file}")
+                else:
+                    file.unlink()
+
+def create_new_links(source: Path, dest: Path, dry: bool):
+    for file in source.iterdir():
+        if file.is_dir():
+            new_dest = dest / file.name
+
+            if not new_dest.exists():
+                if dry:
+                    print(f"Create directory: {new_dest}")
+                else:
+                    new_dest.mkdir()
+            elif new_dest.exists() and not new_dest.is_dir():
+                raise Exception("Directory expected")
+
+            create_new_links(file, new_dest, dry)
+
+        elif file.is_file():
+            new_file = dest / file.name
+
+            if not new_file.exists():
+                if dry:
+                    print(f"Create file: {new_file}")
+                else:
+                    file.copy(new_file)
+
+if __name__ == '__main__':
+    args = get_args()
+    source_directory = args.source
+    destination_directory = args.dest
+    dryrun = args.dry
+
+    if len(source_directory.parts) < 3 or len(destination_directory.parts) < 3:
+        raise Exception("Paths too short")
+
+    if dryrun:
+        print("Dry run - no changes will be made")
+
+    main(source_directory, destination_directory, dryrun)
+
+    if dryrun:
+        print("Dry run - no changes have been made")