$ git clone -n https://src.fedoraproject.org/rpms/rust-ethtool.git /var/lib/mock/f42-build-side-1-3502174-45977/root/chroot_tmpdir/scmroot/rust-ethtool
Cloning into '/var/lib/mock/f42-build-side-1-3502174-45977/root/chroot_tmpdir/scmroot/rust-ethtool'...
$ git fetch origin 058849bc8bf99d1609731b5d70854d20cacf6f6d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-ethtool
 * [new ref]         058849bc8bf99d1609731b5d70854d20cacf6f6d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 058849b Disable build time testing