$ git clone -n https://src.fedoraproject.org/rpms/rust-nu-cmd-lang.git /var/lib/mock/f40-build-2718485-72928/root/chroot_tmpdir/scmroot/rust-nu-cmd-lang
Cloning into '/var/lib/mock/f40-build-2718485-72928/root/chroot_tmpdir/scmroot/rust-nu-cmd-lang'...
$ git fetch origin 9c9b1a6cedf432c9d25adc47f48aede0ab923222:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nu-cmd-lang
 * [new ref]         9c9b1a6cedf432c9d25adc47f48aede0ab923222 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9c9b1a6 Update to 0.91.0 (rhbz#2257501)