$ git clone -n https://src.fedoraproject.org/rpms/rust-nu-json.git /var/lib/mock/f41-build-side-1-3136888-39784/root/chroot_tmpdir/scmroot/rust-nu-json
Cloning into '/var/lib/mock/f41-build-side-1-3136888-39784/root/chroot_tmpdir/scmroot/rust-nu-json'...
$ git fetch origin cdf7955121b2b5fa2bc0c5988238233292bf76f2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nu-json
 * [new ref]         cdf7955121b2b5fa2bc0c5988238233292bf76f2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cdf7955 Update to version 0.99.1