$ git clone -n https://src.fedoraproject.org/rpms/evince.git /var/lib/mock/f42-build-side-1-3583710-46890/root/chroot_tmpdir/scmroot/evince
Cloning into '/var/lib/mock/f42-build-side-1-3583710-46890/root/chroot_tmpdir/scmroot/evince'...
$ git fetch origin e8fa9919c2fb89088e8bcc69196e0eb73459ada9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/evince
 * [new ref]         e8fa9919c2fb89088e8bcc69196e0eb73459ada9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e8fa991 Update to 48.1