$ git clone -n https://src.fedoraproject.org/rpms/rust-nu-engine.git /var/lib/mock/f40-build-2619245-64593/root/chroot_tmpdir/scmroot/rust-nu-engine
Cloning into '/var/lib/mock/f40-build-2619245-64593/root/chroot_tmpdir/scmroot/rust-nu-engine'...
$ git fetch origin 1f841653fb765269c278029f5314a2e45510727e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nu-engine
 * [new ref]         1f841653fb765269c278029f5314a2e45510727e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1f84165 Update to 0.91.0 (rhbz#2257503)