$ git clone -n https://src.fedoraproject.org/rpms/perl-GraphViz2.git /var/lib/mock/f45-build-23780-599/root/chroot_tmpdir/scmroot/perl-GraphViz2
Cloning into '/var/lib/mock/f45-build-23780-599/root/chroot_tmpdir/scmroot/perl-GraphViz2'...
$ git fetch origin b508bc8eefd340b395a60e73cba8e7031e020364:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-GraphViz2
 * [new ref]         b508bc8eefd340b395a60e73cba8e7031e020364 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b508bc8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild