$ git clone -n https://src.fedoraproject.org/rpms/setBfree.git /var/lib/mock/f40-build-793464-138985/root/chroot_tmpdir/scmroot/setBfree
Cloning into '/var/lib/mock/f40-build-793464-138985/root/chroot_tmpdir/scmroot/setBfree'...
$ git fetch origin 8c08b76fdab465248ad27e46c1f873a6ea9bb7c1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/setBfree
 * [new ref]         8c08b76fdab465248ad27e46c1f873a6ea9bb7c1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8c08b76 Add missing patch