$ git clone -n https://src.fedoraproject.org/rpms/perl-HTTP-Tiny-Multipart.git /var/lib/mock/f45-build-24046-601/root/chroot_tmpdir/scmroot/perl-HTTP-Tiny-Multipart
Cloning into '/var/lib/mock/f45-build-24046-601/root/chroot_tmpdir/scmroot/perl-HTTP-Tiny-Multipart'...
$ git fetch origin ad11f1e8e6839489881668e895d0ef7eede748e8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-HTTP-Tiny-Multipart
 * [new ref]         ad11f1e8e6839489881668e895d0ef7eede748e8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ad11f1e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild