startup_init/services/etc/console.user.cfg

{
    "services" : [{
            "name" : "console",
            "path" : ["/system/bin/sh"],
            "disabled" : 1,
            "console" : 1,
            "sandbox" : 0,
            "uid" : "shell",
            "gid" : ["shell", "log", "readproc"],
            "ondemand" : true,
            "jobs" : {
                "on-start" : "services:console"
            },
            "caps" : ["SETGID", "SETUID"],
            "secon" : "u:r:console:s0"
        }
    ]
}