karolba

const credentials = {
    accessKeyId: "AKIA...",
    secretAccessKey: "...",
}

const region = 'eu-west-1'

async function dynamoDB(target, body) {
    const response = await aws4.fetch({
        service: 'dynamodb',

karolba

.tabbrowser-tab .tab-close-button {
        order: -1 !important;
        padding-inline-start: 6px !important;
        margin-left: -4px !important;
        margin-right: -20px !important;
        z-index: 1 !important;
}

.tabbrowser-tab .tab-close-button:not(:hover) {
        color: rgba(0, 0, 0, 0) !important;

karolba

#!/bin/zsh

# Generate strace.* files like that:
# strace -o strace -D -qqq --no-abbrev -y -Y -s 16384 -ff -ttt --seccomp-bpf -e "trace=fork,vfork,clone,fchdir,chdir,/exec*" -e signal=none [...]

emulate sh

# Speed up grep and other similar tools
export LC_ALL=C

karolba

glibc-based systems

The minimum kernel version can be configured by passing in the --enable-kernel parameter to glibc's configure script.

1. Arch Linux - Linux 4.4 (release year: 2016)

...
--enable-kernel=4.4
...

karolba

A way to install Alpine Linux on a Scaleway Stardust instance without the use of a rescue image, but by booting into the install image over the network using https://netboot.xyz.

1. Connect to the serial console, using scw instance server console {uuid} zone={zone}

2. Reboot the VM into UEFI settings

   • either by executing systemctl reboot --firmware on the machine
   • or by using scw instance server reboot {uuid} zone={zone} locally and repeatedly mashing the escape key on the serial console

3. Go to Device Manager -> Network Device List -> the only network device -> HTTP Boot Configuration -> Boot URI

karolba

# /etc/udev/hwdb.d/90-custom-logitech-mx-mini-mac-keyboard.hwdb

evdev:name:MX Keys M Mac Keyboard:*
 KEYBOARD_KEY_70064=grave      # plusminus/paragraph -> grave/tilde
 KEYBOARD_KEY_700e2=leftmeta   # left option -> left windows/super
 KEYBOARD_KEY_700e3=leftalt    # left command -> left alt
 KEYBOARD_KEY_700e7=rightalt   # right command -> right alt

# to reload the config, execute: systemd-hwdb update && udevadm trigger

karolba

#!/bin/bash

common_mapping=(
        $'    {"HIDKeyboardModifierMappingSrc":0x7000000e7,    \n' # <!-- from: right command -->
        $'     "HIDKeyboardModifierMappingDst":0x7000000e6},   \n' # <!--   to: right option -->
        $'                                                     \n' #
        $'    {"HIDKeyboardModifierMappingSrc":0x7000000e6,    \n' # <!-- from: right option -->
        $'     "HIDKeyboardModifierMappingDst":0x7000000e7},   \n' # <!--   to: right command -->
        $'                                                     \n' #
        $'    {"HIDKeyboardModifierMappingSrc": 0x7000000E0,   \n' # <!-- from: left control -->

karolba

extern printf
extern perror
extern exit
extern puts
extern socket
extern bind
extern listen
extern accept
extern close
extern fdopen

karolba

.eqv SYS_PRINT_INT 1
.eqv SYS_READ_INT 5
.eqv SYS_MALLOC 9
.eqv SYS_EXIT 10
.eqv SYS_PRINT_CHAR 11
.eqv SYS_READ_CHAR 12


# macros that push register(s) to the stack
.macro push (%a)

karolba

#include <iostream>
#include <memory>
#include <json/value.h>
#include <json/reader.h>
#include <json/writer.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <stdio.h>
#include <ext/stdio_filebuf.h>