$ git clone -n https://src.fedoraproject.org/rpms/lxde-common.git /var/lib/mock/f42-build-3282783-41399/root/chroot_tmpdir/scmroot/lxde-common
Cloning into '/var/lib/mock/f42-build-3282783-41399/root/chroot_tmpdir/scmroot/lxde-common'...
$ git fetch origin 1e8028c2b011c86c60883119481d8c7e9409b7b1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lxde-common
 * [new ref]         1e8028c2b011c86c60883119481d8c7e9409b7b1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1e8028c fix comment