1 files changed, 15 insertions, 0 deletions
diff --git a/githooks/pre-commit b/githooks/pre-commit
new file mode 100755
index 0000000..ece0c8a
--- /dev/null
+++ b/githooks/pre-commit
@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+#
+# pre-commit hook — block commits when the canonical/mirror pair drifts.
+#
+# Enable by running: git config core.hooksPath githooks
+# (handled by make install-hooks; idempotent on re-run.)
+
+set -euo pipefail
+
+repo_root="$(git rev-parse --show-toplevel)"
+"$repo_root/scripts/sync-check.sh" || {
+    echo "" >&2
+    echo "pre-commit: canonical/mirror drift detected. Commit blocked." >&2
+    exit 1
+}