$ git clone -n https://src.fedoraproject.org/rpms/rust-rand.git /var/lib/mock/f38-build-side-43-rust-devel-1417905-31459/root/chroot_tmpdir/scmroot/rust-rand
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1417905-31459/root/chroot_tmpdir/scmroot/rust-rand'...
$ git fetch origin 4cb41af9eeb5bb4e6e84ce207cc233de48777e88:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rand
 * [new ref]         4cb41af9eeb5bb4e6e84ce207cc233de48777e88 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4cb41af Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild