$ git clone -n https://src.fedoraproject.org/rpms/moby-engine.git /var/lib/mock/f41-build-858859-168491/root/chroot_tmpdir/scmroot/moby-engine
Cloning into '/var/lib/mock/f41-build-858859-168491/root/chroot_tmpdir/scmroot/moby-engine'...
$ git fetch origin 495175fe6eb347a297eec94c4ed02ee2adf8fa8e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/moby-engine
 * [new ref]         495175fe6eb347a297eec94c4ed02ee2adf8fa8e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 495175f Restore pigz as a runtime requirement