$ git clone -n https://src.fedoraproject.org/rpms/rust-nu-utils.git /var/lib/mock/f40-build-2653342-66900/root/chroot_tmpdir/scmroot/rust-nu-utils
Cloning into '/var/lib/mock/f40-build-2653342-66900/root/chroot_tmpdir/scmroot/rust-nu-utils'...
$ git fetch origin 16d8ade02b96ed5b0b5a47aa9ed434373fcdc36e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nu-utils
 * [new ref]         16d8ade02b96ed5b0b5a47aa9ed434373fcdc36e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 16d8ade Update to 0.91.0 (rhbz#2257517)