$ git clone -n https://src.fedoraproject.org/rpms/R-winch.git /var/lib/mock/f40-build-2234583-53405/root/chroot_tmpdir/scmroot/R-winch
Cloning into '/var/lib/mock/f40-build-2234583-53405/root/chroot_tmpdir/scmroot/R-winch'...
$ git fetch origin 1e2055a4579244a2a7538592009c6d6c8e438d6f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-winch
 * [new ref]         1e2055a4579244a2a7538592009c6d6c8e438d6f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1e2055a Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild