$ git clone -n https://src.fedoraproject.org/rpms/open-vmdk.git /var/lib/mock/f40-build-790544-136608/root/chroot_tmpdir/scmroot/open-vmdk
Cloning into '/var/lib/mock/f40-build-790544-136608/root/chroot_tmpdir/scmroot/open-vmdk'...
$ git fetch origin df54459ad99383b8d3053dbb496a58a51a0f3abb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/open-vmdk
 * [new ref]         df54459ad99383b8d3053dbb496a58a51a0f3abb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at df54459 Bump to version 0.3.7