$ git clone -n https://src.fedoraproject.org/rpms/perl-MogileFS-Client.git /var/lib/mock/f45-build-24921-607/root/chroot_tmpdir/scmroot/perl-MogileFS-Client
Cloning into '/var/lib/mock/f45-build-24921-607/root/chroot_tmpdir/scmroot/perl-MogileFS-Client'...
$ git fetch origin 856f8c03fb65810bad2b7f10344753163b323195:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-MogileFS-Client
 * [new ref]         856f8c03fb65810bad2b7f10344753163b323195 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 856f8c0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild