$ git clone -n https://src.fedoraproject.org/rpms/rust-testing_table.git /var/lib/mock/f41-build-side-1-3134301-39731/root/chroot_tmpdir/scmroot/rust-testing_table
Cloning into '/var/lib/mock/f41-build-side-1-3134301-39731/root/chroot_tmpdir/scmroot/rust-testing_table'...
$ git fetch origin d7814f275cdfffc649ba973eea568104442d0633:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-testing_table
 * [new ref]         d7814f275cdfffc649ba973eea568104442d0633 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d7814f2 Added the README