$ git clone -n https://src.fedoraproject.org/rpms/rubygem-rails-controller-testing.git /var/lib/mock/f45-build-35221-694/root/chroot_tmpdir/scmroot/rubygem-rails-controller-testing
Cloning into '/var/lib/mock/f45-build-35221-694/root/chroot_tmpdir/scmroot/rubygem-rails-controller-testing'...
$ git fetch origin 72f9daea83529d78ac5ba97f905492dcdb68b902:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-rails-controller-testing
 * [new ref]         72f9daea83529d78ac5ba97f905492dcdb68b902 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 72f9dae Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild