$ git clone -n https://src.fedoraproject.org/rpms/firewalld.git /var/lib/mock/f45-build-8989-397/root/chroot_tmpdir/scmroot/firewalld
Cloning into '/var/lib/mock/f45-build-8989-397/root/chroot_tmpdir/scmroot/firewalld'...
$ git fetch origin b843ba7dd5b678d83175da0f1e77b609b98c21c3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/firewalld
 * [new ref]         b843ba7dd5b678d83175da0f1e77b609b98c21c3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b843ba7 rebase to v2.5.2