$ git clone -n https://src.fedoraproject.org/rpms/perl-Data-Rmap.git /var/lib/mock/f45-build-22941-595/root/chroot_tmpdir/scmroot/perl-Data-Rmap
Cloning into '/var/lib/mock/f45-build-22941-595/root/chroot_tmpdir/scmroot/perl-Data-Rmap'...
$ git fetch origin 1e13146ff935450eb443f3d1aeea28b3995e67d7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Data-Rmap
 * [new ref]         1e13146ff935450eb443f3d1aeea28b3995e67d7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1e13146 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild