$ git clone -n https://src.fedoraproject.org/rpms/nmstate.git /var/lib/mock/f40-build-2140911-50850/root/chroot_tmpdir/scmroot/nmstate
Cloning into '/var/lib/mock/f40-build-2140911-50850/root/chroot_tmpdir/scmroot/nmstate'...
$ git fetch origin d2c17fdc30a03d9316edb68784dafb5249aee98d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nmstate
 * [new ref]         d2c17fdc30a03d9316edb68784dafb5249aee98d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d2c17fd Upgrade to 2.2.21