$ git clone -n https://github.com/xcp-ng-rpms/ethtool.git /var/lib/mock/v8.3-u-prebuild-9290-28062/root/chroot_tmpdir/scmroot/ethtool
Cloning into '/var/lib/mock/v8.3-u-prebuild-9290-28062/root/chroot_tmpdir/scmroot/ethtool'...
$ git fetch origin 636aca491db1aad970cc96653d859d70a776c27d:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/ethtool
 * [new ref]         636aca491db1aad970cc96653d859d70a776c27d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 636aca4 bump release for test build