$ git clone -n https://src.fedoraproject.org/rpms/rust-serde_spanned.git /var/lib/mock/f38-build-side-42-init-devel-1393502-31050/root/chroot_tmpdir/scmroot/rust-serde_spanned
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1393502-31050/root/chroot_tmpdir/scmroot/rust-serde_spanned'...
$ git fetch origin 811b189bff0108564a93a4404af6be215b9430ff:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde_spanned
 * [new ref]         811b189bff0108564a93a4404af6be215b9430ff -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 811b189 Update to version 0.6.3; Fixes RHBZ#2217113