$ git clone -n https://src.fedoraproject.org/rpms/jssc.git /var/lib/mock/f41-build-786008-13590/root/chroot_tmpdir/scmroot/jssc
Cloning into '/var/lib/mock/f41-build-786008-13590/root/chroot_tmpdir/scmroot/jssc'...
$ git fetch origin 1771e9db5ef994be8fe72bca3849eab102d48c65:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jssc
 * [new ref]         1771e9db5ef994be8fe72bca3849eab102d48c65 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1771e9d Eliminate use of obsolete %patchN syntax (#2283636)