$ git clone -n https://src.fedoraproject.org/rpms/rust-nu-std.git /var/lib/mock/f41-build-side-1-3137267-39791/root/chroot_tmpdir/scmroot/rust-nu-std
Cloning into '/var/lib/mock/f41-build-side-1-3137267-39791/root/chroot_tmpdir/scmroot/rust-nu-std'...
$ git fetch origin 529c8e319307f5396d9e3b12bc6a3677cdafceaf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nu-std
 * [new ref]         529c8e319307f5396d9e3b12bc6a3677cdafceaf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 529c8e3 Update to version 0.99.1