$ git clone -n https://src.fedoraproject.org/rpms/orca.git /var/lib/mock/f42-build-side-1-3554946-46650/root/chroot_tmpdir/scmroot/orca
Cloning into '/var/lib/mock/f42-build-side-1-3554946-46650/root/chroot_tmpdir/scmroot/orca'...
$ git fetch origin 673e78a0bc7191221bbf9c6f59e4fba9a75cd16a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/orca
 * [new ref]         673e78a0bc7191221bbf9c6f59e4fba9a75cd16a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 673e78a Update to 48.1