$ git clone -n https://src.fedoraproject.org/rpms/rust-capnp.git /var/lib/mock/f38-build-side-42-init-devel-1395388-31050/root/chroot_tmpdir/scmroot/rust-capnp
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1395388-31050/root/chroot_tmpdir/scmroot/rust-capnp'...
$ git fetch origin 650f44ba99c45e60cd65e46b09e5ee5cc478b892:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-capnp
 * [new ref]         650f44ba99c45e60cd65e46b09e5ee5cc478b892 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 650f44b Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild