$ git clone -n https://src.fedoraproject.org/rpms/nbd.git /var/lib/mock/f45-build-19498-549/root/chroot_tmpdir/scmroot/nbd
Cloning into '/var/lib/mock/f45-build-19498-549/root/chroot_tmpdir/scmroot/nbd'...
$ git fetch origin e79333b5b9979fddd45db6960b741d66770e0582:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nbd
 * [new ref]         e79333b5b9979fddd45db6960b741d66770e0582 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e79333b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild