$ git clone -n https://src.fedoraproject.org/rpms/toppler.git /var/lib/mock/f40-build-762706-122101/root/chroot_tmpdir/scmroot/toppler
Cloning into '/var/lib/mock/f40-build-762706-122101/root/chroot_tmpdir/scmroot/toppler'...
$ git fetch origin 3065e2ccfa3c7efedfee5397e09a38898fd9f4d0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/toppler
 * [new ref]         3065e2ccfa3c7efedfee5397e09a38898fd9f4d0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3065e2c Add desktop file