$ git clone -n https://src.fedoraproject.org/rpms/rust-below-model.git /var/lib/mock/f38-build-side-43-rust-devel-1403473-31196/root/chroot_tmpdir/scmroot/rust-below-model
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1403473-31196/root/chroot_tmpdir/scmroot/rust-below-model'...
$ git fetch origin 20d26128502566b4c01cdab569fb4dfedaf4ba72:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-below-model
 * [new ref]         20d26128502566b4c01cdab569fb4dfedaf4ba72 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 20d2612 Update to 0.7.1