$ git clone -n https://src.fedoraproject.org/rpms/filezilla.git /var/lib/mock/f40-build-780408-130945/root/chroot_tmpdir/scmroot/filezilla
Cloning into '/var/lib/mock/f40-build-780408-130945/root/chroot_tmpdir/scmroot/filezilla'...
$ git fetch origin 71e339e572f8375e48343fbe548bd4540cbd71c6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/filezilla
 * [new ref]         71e339e572f8375e48343fbe548bd4540cbd71c6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 71e339e 3.66.5