$ git clone -n https://src.fedoraproject.org/rpms/totem.git /var/lib/mock/f42-build-side-1-3555754-46656/root/chroot_tmpdir/scmroot/totem
Cloning into '/var/lib/mock/f42-build-side-1-3555754-46656/root/chroot_tmpdir/scmroot/totem'...
$ git fetch origin 808170c65e329bab8a2b88a28ed0d89f20fc2271:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/totem
 * [new ref]         808170c65e329bab8a2b88a28ed0d89f20fc2271 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 808170c Update to 43.2