$ git clone -n https://src.fedoraproject.org/rpms/cpptest.git /var/lib/mock/f45-build-6987-354/root/chroot_tmpdir/scmroot/cpptest
Cloning into '/var/lib/mock/f45-build-6987-354/root/chroot_tmpdir/scmroot/cpptest'...
$ git fetch origin 151be0310a9b7700d56f5b286efc01ea7475b671:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cpptest
 * [new ref]         151be0310a9b7700d56f5b286efc01ea7475b671 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 151be03 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild