$ git clone -n https://src.fedoraproject.org/rpms/filezilla.git /var/lib/mock/f45-build-8923-397/root/chroot_tmpdir/scmroot/filezilla
Cloning into '/var/lib/mock/f45-build-8923-397/root/chroot_tmpdir/scmroot/filezilla'...
$ git fetch origin f02fd19d21c7ce219e0a642ddd063a61098eb002:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/filezilla
 * [new ref]         f02fd19d21c7ce219e0a642ddd063a61098eb002 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f02fd19 Support nettle 4