$ git clone -n https://src.fedoraproject.org/rpms/rust-object.git /var/lib/mock/f38-build-side-42-init-devel-1394503-31050/root/chroot_tmpdir/scmroot/rust-object
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1394503-31050/root/chroot_tmpdir/scmroot/rust-object'...
$ git fetch origin dd3e2d306fbf82c2cc476628a34cc3c46099f789:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-object
 * [new ref]         dd3e2d306fbf82c2cc476628a34cc3c46099f789 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dd3e2d3 Update to version 0.30.3; Fixes RHBZ#2144698