$ git clone -n https://src.fedoraproject.org/rpms/eth-tools.git /var/lib/mock/f42-build-3419552-45162/root/chroot_tmpdir/scmroot/eth-tools
Cloning into '/var/lib/mock/f42-build-3419552-45162/root/chroot_tmpdir/scmroot/eth-tools'...
$ git fetch origin db9f25c4784ecadc12d209c4d54307b9cb673fad:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/eth-tools
 * [new ref]         db9f25c4784ecadc12d209c4d54307b9cb673fad -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at db9f25c 12.0.0.0 Update 2