$ git clone -n https://src.fedoraproject.org/rpms/ethtool.git /var/lib/mock/f40-build-799840-142608/root/chroot_tmpdir/scmroot/ethtool
Cloning into '/var/lib/mock/f40-build-799840-142608/root/chroot_tmpdir/scmroot/ethtool'...
$ git fetch origin d10b1f635838bcdbcc33211efcec949be2dfdf40:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ethtool
 * [new ref]         d10b1f635838bcdbcc33211efcec949be2dfdf40 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d10b1f6 Upgrade to 6.7 (#2260796)