Vendor dependencies

Let's see how I like this workflow.

vendor/cxx/tools/buck/prelude/http_archive/tools/TARGETS.v2

@@ -0,0 +1,7 @@
+prelude = native
+
+prelude.python_bootstrap_binary(
+    name = "create_exclusion_list",
+    main = "create_exclusion_list.py",
+    visibility = ["PUBLIC"],
+)

vendor/cxx/tools/buck/prelude/http_archive/tools/create_exclusion_list.py

@@ -0,0 +1,36 @@
+#!/usr/bin/env python3
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+#
+# This source code is licensed under both the MIT license found in the
+# LICENSE-MIT file in the root directory of this source tree and the Apache
+# License, Version 2.0 found in the LICENSE-APACHE file in the root directory
+# of this source tree.
+
+import argparse
+import re
+import subprocess
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--tar-flag", action="append")
+    parser.add_argument("--tar-archive")
+    parser.add_argument("--exclude", action="append")
+    parser.add_argument("--out")
+    args = parser.parse_args()
+
+    exclusions = [re.compile(e) for e in args.exclude]
+    files = subprocess.check_output(
+        ["tar", "--list", "-f", args.tar_archive] + args.tar_flag, encoding="utf-8"
+    )
+    files = [f.strip() for f in files.split()]
+
+    with open(args.out, "w", encoding="utf-8") as out:
+        for f in files:
+            if all(excl.match(f) is None for excl in exclusions):
+                continue
+            out.write("{}\n".format(f))
+
+
+if __name__ == "__main__":
+    main()