$ git clone -n https://src.fedoraproject.org/rpms/ignition.git /var/lib/mock/f40-build-805546-144813/root/chroot_tmpdir/scmroot/ignition
Cloning into '/var/lib/mock/f40-build-805546-144813/root/chroot_tmpdir/scmroot/ignition'...
$ git fetch origin bffea0111666425ca1366cbcfbfbe25bf6d8271f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ignition
 * [new ref]         bffea0111666425ca1366cbcfbfbe25bf6d8271f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bffea01 Update to 2.18.0