$ git clone -n https://src.fedoraproject.org/rpms/rust-ciborium-ll.git /var/lib/mock/f38-build-side-42-init-devel-1395704-31050/root/chroot_tmpdir/scmroot/rust-ciborium-ll
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1395704-31050/root/chroot_tmpdir/scmroot/rust-ciborium-ll'...
$ git fetch origin 30f8077602d078e7613d55be1c20c7a87aae4afa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-ciborium-ll
 * [new ref]         30f8077602d078e7613d55be1c20c7a87aae4afa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 30f8077 Update to version 0.2.1