$ git clone -n https://src.fedoraproject.org/rpms/perl-Devel-PartialDump.git /var/lib/mock/f45-build-23187-596/root/chroot_tmpdir/scmroot/perl-Devel-PartialDump
Cloning into '/var/lib/mock/f45-build-23187-596/root/chroot_tmpdir/scmroot/perl-Devel-PartialDump'...
$ git fetch origin f6d50f0910e22d17d710ac379750b695d99172f5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Devel-PartialDump
 * [new ref]         f6d50f0910e22d17d710ac379750b695d99172f5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f6d50f0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild