$ git clone -n https://src.fedoraproject.org/rpms/nazghul.git /var/lib/mock/f45-build-19438-549/root/chroot_tmpdir/scmroot/nazghul
Cloning into '/var/lib/mock/f45-build-19438-549/root/chroot_tmpdir/scmroot/nazghul'...
$ git fetch origin 59cda67ba2caccf6b560b7f44063b7413ef9dbe8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nazghul
 * [new ref]         59cda67ba2caccf6b560b7f44063b7413ef9dbe8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 59cda67 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild