$ git clone -n https://src.fedoraproject.org/rpms/aom.git /var/lib/mock/f41-build-808031-145625/root/chroot_tmpdir/scmroot/aom
Cloning into '/var/lib/mock/f41-build-808031-145625/root/chroot_tmpdir/scmroot/aom'...
$ git fetch origin 0d352aae9a8fbe5d954ec7cb16bdf3692b502d1d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/aom
 * [new ref]         0d352aae9a8fbe5d954ec7cb16bdf3692b502d1d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0d352aa Update to version 3.9.0; Fixes RHBZ#2274372