$ git clone -n https://src.fedoraproject.org/rpms/filezilla.git /var/lib/mock/f40-build-1996401-44010/root/chroot_tmpdir/scmroot/filezilla
Cloning into '/var/lib/mock/f40-build-1996401-44010/root/chroot_tmpdir/scmroot/filezilla'...
$ git fetch origin 5165a74fe1a5525e917d74a8cf150045763706a9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/filezilla
 * [new ref]         5165a74fe1a5525e917d74a8cf150045763706a9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5165a74 3.66.1