$ git clone -n https://src.fedoraproject.org/rpms/atomic-queue.git /var/lib/mock/f42-build-side-1-3537703-46560/root/chroot_tmpdir/scmroot/atomic-queue
Cloning into '/var/lib/mock/f42-build-side-1-3537703-46560/root/chroot_tmpdir/scmroot/atomic-queue'...
$ git fetch origin 7704c796a9ca692dd0d607efcf0987a8a732c84c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/atomic-queue
 * [new ref]         7704c796a9ca692dd0d607efcf0987a8a732c84c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7704c79 Update to 1.6.9 upstream release