1 files changed, 60 insertions, 0 deletions
diff --git a/root/scripts/sync-monorepo-public.py b/root/scripts/sync-monorepo-public.py
new file mode 100644
index 0000000..fe1592f
--- /dev/null
+++ b/root/scripts/sync-monorepo-public.py
@@ -0,0 +1,60 @@
+import os
+import re
+import shutil
+import subprocess
+import typing
+
+import git_filter_repo
+
+TRAILER_KEY = b"monorepo-revid:"
+TRAILER_LINE_RE = re.compile(rb"^[A-Za-z0-9-]+:\s")
+REMOTE_URL = "ssh://git@plato/~/monorepo-public"
+
+
+def commit_callback(commit: git_filter_repo.Commit, metadata: object) -> None:
+    if not commit.message:
+        return
+
+    assert isinstance(commit.message, bytes), (
+        f"commit.message was not bytes but was {type(commit.message)}"
+    )
+    assert TRAILER_KEY not in commit.message, (
+        f"found monorepo-revid trailer header in:\n\n{commit.message}"
+    )
+
+    lines = commit.message.splitlines()
+
+    assert isinstance(commit.original_id, bytes), (
+        f"commit.original_id was not bytes but was {type(commit.original_id)}"
+    )
+
+    trailer = TRAILER_KEY + b" " + commit.original_id
+    in_trailer_block = (
+        bool(lines) and len(lines) > 1 and TRAILER_LINE_RE.match(lines[-1]) is not None
+    )
+    if not in_trailer_block and lines and lines[-1] != b"":
+        lines.append(b"")
+
+    lines.append(trailer)
+
+    commit.message = b"\n".join(lines) + b"\n"
+
+
+def main(src: str, dst: str) -> None:
+    subprocess.run(["git", "clone", "--no-local", "--", src, dst], check=True)
+    os.chdir(dst)
+    git_filter_repo.RepoFilter(
+        git_filter_repo.FilteringOptions.parse_args(
+            ["--path", "private/", "--invert-paths"]
+        ),
+        commit_callback=commit_callback,
+    ).run()
+    subprocess.run(["git", "remote", "add", "origin", REMOTE_URL], check=True)
+    subprocess.run(["git", "push", "--force", "--all", "origin"], check=True)
+
+
+if __name__ == "__main__":
+    src = os.getcwd()
+    dst = "/tmp/monorepo-public-sync"
+    shutil.rmtree(dst, ignore_errors=True)
+    main(src, dst)