$ git clone -n https://src.fedoraproject.org/rpms/rubygem-treetop.git /var/lib/mock/f45-build-35411-695/root/chroot_tmpdir/scmroot/rubygem-treetop
Cloning into '/var/lib/mock/f45-build-35411-695/root/chroot_tmpdir/scmroot/rubygem-treetop'...
$ git fetch origin dfea7e5fc460c6f357bfb0db004d4773b44f91ed:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-treetop
 * [new ref]         dfea7e5fc460c6f357bfb0db004d4773b44f91ed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dfea7e5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild