$ git clone -n https://src.fedoraproject.org/rpms/rubygem-narray.git /var/lib/mock/f45-build-35046-693/root/chroot_tmpdir/scmroot/rubygem-narray
Cloning into '/var/lib/mock/f45-build-35046-693/root/chroot_tmpdir/scmroot/rubygem-narray'...
$ git fetch origin 62f3665f441295c4c7506647f6d518645720f891:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-narray
 * [new ref]         62f3665f441295c4c7506647f6d518645720f891 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 62f3665 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild