$ git clone -n https://src.fedoraproject.org/rpms/golang-github-jwt.git /var/lib/mock/f45-build-20150-568/root/chroot_tmpdir/scmroot/golang-github-jwt
Cloning into '/var/lib/mock/f45-build-20150-568/root/chroot_tmpdir/scmroot/golang-github-jwt'...
$ git fetch origin b66429563354890f6ebc46de45699e9c78c061c5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-jwt
 * [new ref]         b66429563354890f6ebc46de45699e9c78c061c5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b664295 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild