$ git clone -n https://src.fedoraproject.org/rpms/rakudo.git /var/lib/mock/f39-build-1523906-36021/root/chroot_tmpdir/scmroot/rakudo
Cloning into '/var/lib/mock/f39-build-1523906-36021/root/chroot_tmpdir/scmroot/rakudo'...
$ git fetch origin 4cd4dcd98f7005d3fd9e6bd5bf3f3bc72d4cc109:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rakudo
 * [new ref]         4cd4dcd98f7005d3fd9e6bd5bf3f3bc72d4cc109 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4cd4dcd update to 2023.06