$ git clone -n https://src.fedoraproject.org/rpms/rubygem-rails-dom-testing.git /var/lib/mock/f45-build-35210-694/root/chroot_tmpdir/scmroot/rubygem-rails-dom-testing
Cloning into '/var/lib/mock/f45-build-35210-694/root/chroot_tmpdir/scmroot/rubygem-rails-dom-testing'...
$ git fetch origin ba070ecaa5493b8dc6d73aed514354ff1d7df689:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-rails-dom-testing
 * [new ref]         ba070ecaa5493b8dc6d73aed514354ff1d7df689 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ba070ec Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild