$ git clone -n https://src.fedoraproject.org/rpms/golang-github-nats-io-nkeys.git /var/lib/mock/f40-build-2236482-53513/root/chroot_tmpdir/scmroot/golang-github-nats-io-nkeys
Cloning into '/var/lib/mock/f40-build-2236482-53513/root/chroot_tmpdir/scmroot/golang-github-nats-io-nkeys'...
$ git fetch origin d56f3d83d858c9364d030c2b68c3f757dcc803f8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-nats-io-nkeys
 * [new ref]         d56f3d83d858c9364d030c2b68c3f757dcc803f8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d56f3d8 update to 0.4.7, close rhbz#2256227