$ git clone -n https://src.fedoraproject.org/rpms/rust-rustversion.git /var/lib/mock/f38-build-side-43-rust-devel-1406156-31260/root/chroot_tmpdir/scmroot/rust-rustversion
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1406156-31260/root/chroot_tmpdir/scmroot/rust-rustversion'...
$ git fetch origin f40c5d8e23be34b5a249221bae2ed656293d10ec:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rustversion
 * [new ref]         f40c5d8e23be34b5a249221bae2ed656293d10ec -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f40c5d8 Update to version 1.0.14; Fixes RHBZ#2223136