$ git clone -n https://src.fedoraproject.org/rpms/rust-nu-engine.git /var/lib/mock/f41-build-side-1-3137279-39791/root/chroot_tmpdir/scmroot/rust-nu-engine
Cloning into '/var/lib/mock/f41-build-side-1-3137279-39791/root/chroot_tmpdir/scmroot/rust-nu-engine'...
$ git fetch origin 8423d306111c3193c69206c97e8d4e6fda5927e2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nu-engine
 * [new ref]         8423d306111c3193c69206c97e8d4e6fda5927e2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8423d30 Update to version 0.99.1