$ git clone -n https://src.fedoraproject.org/rpms/rust-nu-parser.git /var/lib/mock/f40-build-2662205-66931/root/chroot_tmpdir/scmroot/rust-nu-parser
Cloning into '/var/lib/mock/f40-build-2662205-66931/root/chroot_tmpdir/scmroot/rust-nu-parser'...
$ git fetch origin b1fe993143f88e5eaa5a528e004df9f743f66635:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nu-parser
 * [new ref]         b1fe993143f88e5eaa5a528e004df9f743f66635 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b1fe993 Update to 0.91.0 (rhbz#2257507)