$ git clone -n https://src.fedoraproject.org/rpms/folks.git /var/lib/mock/f40-build-2074698-49428/root/chroot_tmpdir/scmroot/folks
Cloning into '/var/lib/mock/f40-build-2074698-49428/root/chroot_tmpdir/scmroot/folks'...
$ git fetch origin 46ddcfae1001e5ae2e74d07acf134b0fcec2214a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/folks
 * [new ref]         46ddcfae1001e5ae2e74d07acf134b0fcec2214a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 46ddcfa Drop C89 exception (#2159284)