$ git clone -n https://src.fedoraproject.org/rpms/hcloud.git /var/lib/mock/f40-build-2484844-61641/root/chroot_tmpdir/scmroot/hcloud
Cloning into '/var/lib/mock/f40-build-2484844-61641/root/chroot_tmpdir/scmroot/hcloud'...
$ git fetch origin b2700c887e2e8ea073769de065d8b1b2c6e9633a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/hcloud
 * [new ref]         b2700c887e2e8ea073769de065d8b1b2c6e9633a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b2700c8 Set version number rhbz#2264160