$ git clone -n https://src.fedoraproject.org/rpms/rust-nu.git /var/lib/mock/f41-build-1108201-20093/root/chroot_tmpdir/scmroot/rust-nu
Cloning into '/var/lib/mock/f41-build-1108201-20093/root/chroot_tmpdir/scmroot/rust-nu'...
$ git fetch origin fff166fb7c14c35a1abd57b995fe350733f5fabe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nu
 * [new ref]         fff166fb7c14c35a1abd57b995fe350733f5fabe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fff166f Rebuild with Rust 1.78 to fix incomplete debuginfo and backtraces