init

#!/usr/bin/env bash

function configure_init()
{
    set -x
    export PATH=/sbin:/bin
}
function configure_fs()
{
    mount -o remount,rw /

    mount -t proc proc /proc
    mount -t sysfs sys /sys

    # /dev/ptmx
    mkdir -p /dev/pts
    mount -t devpts devpts /dev/pts
}
function configure_net()
{
    ip l s dev lo up
    dhcpcd eth0
}
function configure_env()
{
    local env=(
        TERM=xterm
    )
    export "${env[@]}"
}
function configure_tty_minimum()
{ stty rows 50 cols 182; }
function parse_cmdline()
{
    local args i
    mapfile -d' ' args < /proc/cmdline
    for i in "${args[@]}"; do
        local key value
        # we do allow backslash escape here
        IFS='=' read key value <<<"$i"
        [[ -n $value ]] || continue
        value="${value%% }"

        case "$key" in
            eval)   eval "$value";;
            shell)  sh -c "$value";;
            env)    export "${value?}";;

            tty.rows) stty rows "$value";;
            tty.cols) stty cols "$value";;
        esac
    done
}
function main()
{
    configure_init
    configure_fs
    configure_net
    configure_env
    configure_tty_minimum

    parse_cmdline

    tmux || bash
}
main "$@"