$ git clone -n https://src.fedoraproject.org/rpms/voro++.git /var/lib/mock/f45-build-38168-722/root/chroot_tmpdir/scmroot/voro++
Cloning into '/var/lib/mock/f45-build-38168-722/root/chroot_tmpdir/scmroot/voro++'...
$ git fetch origin e650156da9a19fe83ff14ea159e34672b99d5f9e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/voro++
 * [new ref]         e650156da9a19fe83ff14ea159e34672b99d5f9e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e650156 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild