diff --git a/scripts/merge_directories.py b/scripts/merge_directories.py
new file mode 100755
index 0000000..3f8631b
--- /dev/null
+++ b/scripts/merge_directories.py
@@ -0,0 +1,60 @@
+#!/usr/bin/env python3
+import argparse
+import os
+import shutil
+import sys
+
+def main():
+    parser = argparse.ArgumentParser(
+        description="Given a list of directories, this script will copy the contents of all of "
+        "them into the first directory, erroring out if any duplicate files are found."
+    )
+    parser.add_argument(
+        "--ignore-duplicates",
+        action="store_true",
+        help="Don't error out on duplicate files, just skip them. The file from the earliest "
+        "directory listed on the command line will be the winner."
+    )
+    parser.add_argument(
+        "--file-list",
+        help="Path to a text file containing paths relative to in_dir. Only these paths will be "
+        "copied out of in_dir."
+    )
+    parser.add_argument("out_dir")
+    parser.add_argument("in_dir")
+    args = parser.parse_args()
+
+    if not os.path.isdir(args.out_dir):
+        sys.exit(f"error: {args.out_dir} must be a directory")
+    if not os.path.isdir(args.in_dir):
+        sys.exit(f"error: {args.in_dir} must be a directory")
+
+    file_list = None
+    if args.file_list:
+        with open(file_list_file, "r") as f:
+            file_list = f.read().strip().splitlines()
+
+    in_dir = args.in_dir
+    for root, dirs, files in os.walk(in_dir):
+        rel_root = os.path.relpath(root, in_dir)
+        dst_root = os.path.join(args.out_dir, rel_root)
+        made_parent_dirs = False
+        for f in files:
+            src = os.path.join(root, f)
+            dst = os.path.join(dst_root, f)
+            p = os.path.normpath(os.path.join(rel_root, f))
+            if file_list is not None and p not in file_list:
+                continue
+            if os.path.lexists(dst):
+                if args.ignore_duplicates:
+                    continue
+                sys.exit(f"error: {p} exists in both {args.out_dir} and {in_dir}")
+
+            if not made_parent_dirs:
+                os.makedirs(dst_root, exist_ok=True)
+                made_parent_dirs = True
+
+            shutil.copy2(src, dst, follow_symlinks=False)
+
+if __name__ == "__main__":
+    main()