$ git clone -n https://src.fedoraproject.org/rpms/perl-Mad-Mapper.git /var/lib/mock/f45-build-24591-605/root/chroot_tmpdir/scmroot/perl-Mad-Mapper
Cloning into '/var/lib/mock/f45-build-24591-605/root/chroot_tmpdir/scmroot/perl-Mad-Mapper'...
$ git fetch origin d1a2362c00ae08bd668cedb97f8deaa965d7500b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Mad-Mapper
 * [new ref]         d1a2362c00ae08bd668cedb97f8deaa965d7500b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d1a2362 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild