$ git clone -n https://src.fedoraproject.org/rpms/perl-Dumbbench.git /var/lib/mock/f45-build-23252-596/root/chroot_tmpdir/scmroot/perl-Dumbbench
Cloning into '/var/lib/mock/f45-build-23252-596/root/chroot_tmpdir/scmroot/perl-Dumbbench'...
$ git fetch origin ec0440e51f7afaef679e96f20b7523f0ec68de01:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Dumbbench
 * [new ref]         ec0440e51f7afaef679e96f20b7523f0ec68de01 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ec0440e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild