$ git clone -n https://src.fedoraproject.org/rpms/lftp.git /var/lib/mock/f41-build-1144846-21156/root/chroot_tmpdir/scmroot/lftp
Cloning into '/var/lib/mock/f41-build-1144846-21156/root/chroot_tmpdir/scmroot/lftp'...
$ git fetch origin 5c8be2a593eef3fb41dbdbaeb0bc29dc86111def:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lftp
 * [new ref]         5c8be2a593eef3fb41dbdbaeb0bc29dc86111def -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5c8be2a Eliminate use of obsolete %patchN syntax (#2283636)