fio --loops=5 --size=1000m --filename=/mnt/fs/fiotest.tmp --stonewall --ioengine=libaio --direct=1 \
  --name=Seqread --bs=1m --rw=read \
  --name=Seqwrite --bs=1m --rw=write \
  --name=512Kread --bs=512k --rw=randread \
  --name=512Kwrite --bs=512k --rw=randwrite \
  --name=4kQD32read --bs=4k --iodepth=32 --rw=randread \
  --name=4kQD32write --bs=4k --iodepth=32 --rw=randwrite

fake sudo

a Script to allow normal user to launch root shell, after providing a KEY file.

In android, I don't want to root my phone, but still needs root access.

So I installed this script, instead of SuperSU.

#include <rlib/sys/unix_handy.hpp>
#include <rlib/opt.hpp>

int main(int argc, char **argv) {
    rlib::opt_parser args(argc, argv);
    auto keyFile = args.getValueArg("-k", false, "");


    rlib::execs("/bin/bash", std::vector<std::string>{"", keyFile});

# Usage: 1. Generate your key file, and keep it secret. Get its SHA256 and write it down at `answer`.
#        2. Compile, Then run the following commands as root:
#               chmod +s ./runas
#        3. Try `./runas -k ./key` as normal user.
# File Permissions:
# -rwsr-sr-x 1 root    root    82K Apr 18 19:29 runas*
# -rw-r--r-- 1 recolic recolic 320 Apr 18 19:29
# ---------- 1 root    root    733 Apr 18 19:35*

[ "$1" = "" ] && key_file_name="./key" || key_file_name="$1"
echo "Verifying '$key_file_name'..."

#### Verify key file
checksum=$(sha256sum "$key_file_name" | sed 's/ .*$//g')

if [ "$checksum" = "$answer" ]; then
    echo 'Verification failed.'
    exit 2

exit $?

I bought a cheap motherboard and realized that, I have no cable for 10pin(motherboard) to 15pin vga. And things went worse after I realized that my USB2TTL cable is not working for RS232 serial port.

Then... I have to install archlinux WITHOUT monitor. But, fortunately, I have a KEYBOARD!


I was too lazy to modify ArchISO. I just plug the ARCHISO usb stick and a blank harddisk, and boot, then a new client appears on my router. The dhcpcd is working out-of-box!

The router told me the IP:

Then I type the following characters on my keyboard:

curl | bash
systemctl start sshd is my self-hosted website, and I can access the nginx access.log to confirm that the command above has succeeded. The setup script will download my public key, and put it into /root/.ssh/authorized_keys, and configure the permission bits to make sshd happy.

Now try ssh [email protected]. It works.


It's too simple to install an arch linux. archfi made it easy.


AFter shutdown the machine, remove the harddisk from motherboard, and use another WORKING linux laptop to mount this harddisk. Do the following things:

mount BOOT partition and ROOT partition to /mnt
arch-chroot into it
install openssh, dhcpcd
systemctl enable sshd, dhcpcd
Modify /etc/ssh/sshd_config to allow RootLogin.
Set root password if you're not already done.
put your public key into /root/.ssh/authorized_keys and set the permission properly.

Good. Plug the harddisk into the headless machine, it should boot and be ready for ssh-into.


Q: Why not plug the harddisk into another machine, and install the Archlinux OS?

A: Then you need to boot from archiso, and perform grub-install, to allow booting the new OS. Then you have to do everything I have done.

Remove wine file associations.

# Prevent the fucking wine to add mime file association.
# Implements

set -o xtrace

rm -f ~/.local/share/mime/packages/x-wine*
rm -f ~/.local/share/applications/wine-extension*
rm -f ~/.local/share/icons/hicolor/*/*/application-x-wine-extension*
rm -f ~/.local/share/mime/application/x-wine-extension*

sudo sed -i 's/winemenubuilder.exe -a -r/winemenubuilder.exe -r/g' /usr/share/wine/wine.inf

if [[ "$WINEPREFIX" = "" ]]; then

if [[ -f "$WINEPREFIX/system.reg" ]]; then
    sed -i 's/winemenubuilder.exe -a -r/winemenubuilder.exe -r/g' "$WINEPREFIX/system.reg"

Maybe outdated.

I've used @beliys code and made a bash command.

Setup: Add this code to your ~/.bash_aliases file.

function gdrive_download () {
  CONFIRM=$(wget --quiet --save-cookies /tmp/cookies.txt --keep-session-cookies --no-check-certificate "$1" -O- | sed -rn 's/.*confirm=([0-9A-Za-z_]+).*/\1\n/p')
  wget --load-cookies /tmp/cookies.txt "$CONFIRM&id=$1" -O $2
  rm -rf /tmp/cookies.txt

Open new bash session. Usage:

gdrive_download long_google_drive_file_id filename.ext

Surface Book 2 / Surface Pro (2017) / Surface Laptop UART protocol proof-of-concept script.

This script is from

It works for Surface Book 2 and Surface Pro 2017.

If you're using Surface Laptop, edit the baudrate to 1843200 and it will work too.

If /dev/ttyS4 doesn't exist, try /dev/ttyS0. (My Surface Laptop is the case)

2020 update: This post is already outdated. Please refer to latest linux-surface to see if problem got resolved.

#!/usr/bin/env python3

import json
import pprint
import crcmod

from argparse import ArgumentParser

from pathlib import Path

import serial
from serial import Serial

DEFAULT_DEVICE = '/dev/ttyS4'
CRC_FN = crcmod.predefined.mkCrcFun('crc-ccitt-false')

def setup_device(port):
    # definition from DSDT
    return Serial(

def crc(pld):
    x = CRC_FN(bytes(pld))
    return [x & 0xff, (x >> 0x08) & 0xff]

def to_int(bytes):
    return int.from_bytes(bytes, byteorder='little')

class Counters:
    PATH = Path(__file__).parent / '.counters.json'

    def load():
        if Counters.PATH.is_file():
            with open(Counters.PATH) as fd:
                data = json.load(fd)
                seq = data['seq']
                cnt = data['cnt']
            seq = 0x00
            cnt = 0x0000

        return Counters(seq, cnt)

    def __init__(self, seq, cnt):
        self.seq = seq
        self.cnt = cnt

    def store(self):
        with open(Counters.PATH, 'w') as fd:
            data = {'seq': self.seq, 'cnt': self.cnt}
            json.dump(data, fd)

    def inc_seq(self):
        self.seq = (self.seq + 1) & 0xFF

    def inc_cnt(self):
        self.cnt = (self.cnt + 1) & 0xFFFF

    def inc(self):

class Command:
    def __init__(self, rtc, riid, rcid):
        self.rtc = rtc
        self.riid = riid
        self.rcid = rcid

    def _write_msg(self, dev, seq, cnt):
        cnt_lo = cnt & 0xff
        cnt_hi = (cnt >> 0x08) & 0xff

        hdr = [0x80, 0x08, 0x00, seq]
        pld = [0x80, self.rtc, 0x01, 0x00, self.riid, cnt_lo, cnt_hi, self.rcid]
        msg = [0xaa, 0x55] + hdr + crc(hdr) + pld + crc(pld)

        return dev.write(bytes(msg))

    def _write_ack(self, dev, seq):
        hdr = [0x40, 0x00, 0x00, seq]
        msg = [0xaa, 0x55] + hdr + crc(hdr) + [0xff, 0xff]

        return dev.write(bytes(msg))

    def _read_ack(self, dev, exp_seq):
        msg = bytes()
        while len(msg) < 0x0A:
            msg += - len(msg))

        print("received: {}".format(msg.hex()))

        assert msg[0:2] == bytes([0xaa, 0x55])
        assert msg[3:5] == bytes([0x00, 0x00])
        assert msg[6:8] == bytes(crc(msg[2:-4]))
        assert msg[8:] == bytes([0xff, 0xff])

        mty = msg[2]
        seq = msg[5]

        if mty == 0x40:
            assert seq == exp_seq

        return mty == 0x04

    def _read_msg(self, dev, cnt):
        cnt_lo = cnt & 0xff
        cnt_hi = (cnt >> 0x08) & 0xff

        buf = bytes()
        rem = 0x08                          # begin with header length
        while len(buf) < rem:
            buf +=

            # if we got a header, validate it
            if rem == 0x08 and len(buf) >= 0x08:
                hdr = buf[0:8]

                assert hdr[0:3] == bytes([0xaa, 0x55, 0x80])
                assert hdr[-2:] == bytes(crc(hdr[2:-2]))

                rem += hdr[3] + 10          # len(payload) + frame + crc

        hdr = buf[0:8]
        msg = buf[8:hdr[3]+10]
        rem = buf[hdr[3]+10:]

        print("received: {}".format(hdr.hex()))
        print("received: {}".format(msg.hex()))

        assert msg[0:8] == bytes([0x80, self.rtc, 0x00, 0x01, self.riid, cnt_lo, cnt_hi, self.rcid])
        assert msg[-2:] == bytes(crc(msg[:-2]))

        seq = hdr[5]
        pld = msg[8:-2]

        return seq, pld, rem

    def _read_clean(self, dev, buf=bytes()):
        buf +=                     # make sure we're not missing some bytes

        while buf:
            # get header / detect message type
            if len(buf) >= 0x08:
                if buf[0:3] == bytes([0xaa, 0x55, 0x40]):               # ACK
                    while len(buf) < 0x0A:
                        buf +=

                    print("ignored ACK: {}".format(buf[:0x0a].hex()))
                    buf = bytes(buf[0x0a:])

                elif buf[0:3] == bytes([0xaa, 0x55, 0x80]):             # response
                    buflen = 0x0a + buf[3]
                    while len(buf) < buflen:
                        buf +=

                    print("ignored MSG: {}".format(buf[:buflen].hex()))
                    buf = bytes(buf[buflen:])

                elif buf[0:3] == bytes([0x4e, 0x00, 0x53]):             # control message?
                    while len(buf) < 0x19:
                        buf +=

                    print("ignored CTRL: {}".format(buf[:0x19].hex()))
                    buf = bytes(buf[0x19:])

                else:                                                   # unknown
                    print("ignored unknown: {}".format(buf.hex()))
                    assert False

            buf +=

    def run(self, dev, cnt):
        self._write_msg(dev, cnt.seq, cnt.cnt)
        retry = self._read_ack(dev, cnt.seq)

        # retry one time on com failure
        if retry:
            self._write_msg(dev, cnt.seq, cnt.cnt)
            retry = self._read_ack(dev, cnt.seq)

            if retry:
                print('Communication failure: invalid ACK, try again')

            seq, pld, rem = self._read_msg(dev, cnt.cnt)
            self._write_ack(dev, seq)
            self._read_clean(dev, rem)

        return self._handle_payload(pld)

    def _handle_payload(self, pld):
        return None

class Gbos(Command):
    def __init__(self):
        super().__init__(0x11, 0x00, 0x0d)

    def _handle_payload(self, pld):
        return {
            'Base Status': hex(pld[0]),

class Psr(Command):
    def __init__(self, bat):
        super().__init__(0x02, bat, 0x0d)

    def _handle_payload(self, pld):
        return {
            'Power Source': hex(to_int(pld[0:4])),

class Sta(Command):
    def __init__(self, bat):
        super().__init__(0x02, bat, 0x01)

    def _handle_payload(self, pld):
        return {
            'Battery Status': hex(to_int(pld[0:4])),

class Bst(Command):
    def __init__(self, bat):
        super().__init__(0x02, bat, 0x03)

    def _handle_payload(self, pld):
        return {
            'State': hex(to_int(pld[0:4])),
            'Present Rate': hex(to_int(pld[4:8])),
            'Remaining Capacity': hex(to_int(pld[8:12])),
            'Present Voltage': hex(to_int(pld[12:16])),

class Bix(Command):
    def __init__(self, bat):
        super().__init__(0x02, bat, 0x02)

    def _handle_payload(self, pld):
        return {
            'Revision': hex(pld[0]),
            'Power Unit': hex(to_int(pld[1:5])),
            'Design Capacity': hex(to_int(pld[5:9])),
            'Last Full Charge Capacity': hex(to_int(pld[9:13])),
            'Technology': hex(to_int(pld[13:17])),
            'Design Voltage': hex(to_int(pld[17:21])),
            'Design Capacity of Warning': hex(to_int(pld[21:25])),
            'Design Capacity of Low': hex(to_int(pld[25:29])),
            'Cycle Count': hex(to_int(pld[29:33])),
            'Measurement Accuracy': hex(to_int(pld[33:37])),
            'Max Sampling Time': hex(to_int(pld[37:41])),
            'Min Sampling Time': hex(to_int(pld[41:45])),
            'Max Averaging Interval': hex(to_int(pld[45:49])),
            'Min Averaging Interval': hex(to_int(pld[49:53])),
            'Capacity Granularity 1': hex(to_int(pld[53:57])),
            'Capacity Granularity 2': hex(to_int(pld[57:61])),
            'Model Number': pld[61:82].decode().rstrip('\0'),
            'Serial Number': pld[82:93].decode().rstrip('\0'),
            'Type': pld[93:98].decode().rstrip('\0'),
            'OEM Information': pld[98:119].decode().rstrip('\0'),

class PrettyBat:
    def __init__(self, bat):
        self.bix = Bix(bat)
        self.bst = Bst(bat)

    def run(self, dev, cnt):
        bix =, cnt)
        bst =, cnt)

        state = int(bst['State'], 0)
        vol = int(bst['Present Voltage'], 0)
        rem_cap = int(bst['Remaining Capacity'], 0)
        full_cap = int(bix['Last Full Charge Capacity'], 0)
        rate = int(bst['Present Rate'], 0)

        bat_states = {
            0: 'None',
            1: 'Discharging',
            2: 'Charging',
            4: 'Critical',
            5: 'Critical (Discharging)',
            6: 'Critical (Charging)',

        bat_state = bat_states[state]
        bat_vol = vol / 1000

        if full_cap <= 0:
            bat_rem_perc = '<unavailable>'
            bat_rem_perc = "{}%".format(int(rem_cap / full_cap * 100))

        if state == 0x00 or rate == 0:
            bat_rem_life = '<unavailable>'
            bat_rem_life = "{:.2f}h".format(rem_cap / rate)

        return {
            'State': bat_state,
            'Voltage': "{}V".format(bat_vol),
            'Precentage': bat_rem_perc,
            'Remaing ': bat_rem_life,

    'lid0.gbos': Gbos(),
    'adp1._psr': Psr(0x01),
    'bat1._sta': Sta(0x01),
    'bat1._bst': Bst(0x01),
    'bat1._bix': Bix(0x01),
    'bat2._sta': Sta(0x02),
    'bat2._bst': Bst(0x02),
    'bat2._bix': Bix(0x02),

    'bat1.pretty': PrettyBat(0x01),
    'bat2.pretty': PrettyBat(0x02),

def main():
    cli = ArgumentParser(description='Surface Book 2 / Surface Pro (2017) embedded controller requests.')
    cli.add_argument('-d', '--device', default=DEFAULT_DEVICE, metavar='DEV', help='the UART device')
    cli.add_argument('-c', '--cnt', type=lambda x: int(x, 0), help='overwrite CNT')
    cli.add_argument('-s', '--seq', type=lambda x: int(x, 0), help='overwrite SEQ')
    commands = cli.add_subparsers()

    for cmd in COMMANDS.keys():
        parser = commands.add_parser(cmd, help="run request '{}'".format(cmd.upper()))

    args = cli.parse_args()

    dev = setup_device(args.device)
    cmd = COMMANDS.get(args.command)

    cnt = Counters.load()
    if args.seq is not None:
        cnt.seq = args.seq
    if args.cnt is not None:
        cnt.cnt = args.cnt

        res =, cnt)


if __name__ == '__main__':


url = ""
verify_ssl = true
name = "pypi"

crcmod = "*"
pyserial = "*"

pylint = "*"

#!/usr/bin/env python3
# Use this script with and 
#     to avoid typing fucked numbers into page by hand.
# Fuck the chinese shits who prevent you from pasting password.
#     E.x. Alibaba bitch
from pykeyboard import PyKeyboard
import time

def virtual_type_array(arrToType, noWait=False):
    k = PyKeyboard()
    if not noWait:
        print('You have 5 seconds to ready for auto-typing.')
    for d in arrToType:

def _type(s):
    k = PyKeyboard()
    print('You have 5 seconds to ready for auto-typing.')

if __name__ == "__main__":
    import sys

One-click enable bbr.


uname -r | grep -E '^(4\.(1[^\.]|9))|5\.' > /dev/null
(( $? == 1 )) && echo 'Linux kernel version must >= 4.9' && exit 1

[[ `whoami` != root ]] && echo 'You must be root' && exit 1

lsmod | grep bbr > /dev/null
(( $? == 1 )) &&
    modprobe tcp_bbr &&
    echo "tcp_bbr" >> /etc/modules-load.d/modules.conf

echo "net.core.default_qdisc=fq" >> /etc/sysctl.conf &&
echo "net.ipv4.tcp_congestion_control=bbr" >> /etc/sysctl.conf &&
sysctl -p

sysctl net.ipv4.tcp_available_congestion_control
sysctl net.ipv4.tcp_congestion_control

sysctl net.ipv4.tcp_congestion_control | grep bbr > /dev/null && echo 'Success.' || echo 'Failed.'