byrongibson

/*****************************************************************************
 *                QuantCup 1:   Price-Time Matching Engine
 *
 * Submitted by: voyager
 *
 * Design Overview:
 *   In this implementation, the limit order book is represented using
 *   a flat linear array (pricePoints), indexed by the numeric price value.
 *   Each entry in this array corresponds to a specific price point and holds
 *   an instance of struct pricePoint. This data structure maintains a list

byrongibson

mkfifo /tmp/gfifo

./xdp-screen-cast-ffmpeg.py &  # or run in another terminal
# Note the gstreamer pipeline
# 'pipewiresrc fd=%d path=%u ! videorate ! video/x-raw,framerate=60/1 ! videoconvert ! filesink location=/tmp/gfifo'
# I specified a 60/1 frameerate. You can do other pre-processing here, or offload it to ffmpeg.

# Encode the stream and pipe to netcat
# note: must specify correct resolution here
# we can now use h264_nvenc, mpegts, and anything else ffmpeg has

byrongibson

// I'm tired of extensions that automatically:
// - show welcome pages / walkthroughs
// - show release notes
// - send telemetry
// - recommend things
//
// This disables all of that stuff.
// If you have more config, leave a comment so I can add it!!

{

byrongibson

Zoom Sucks

• Zoom abuses the installer flow on MacOS to bypass permissions dialogs (source)
• Zoom sends identifying device info to Facebook, even when users don't have a Facebook account (source) (fixed)
• A bug in Zoom sent identifying information (including email addresses and profile pictures) of thousands of users to strangers (source)
• Zoom claims that meetings are end-to-end encrypted in their white paper and marketing materials, but meetings are only encrypted in transit, and are available in plaintext to Zoom servers and employees. (source)
• zoomAutenticationTool can be used to escalat

byrongibson

Requirements

1. Encrypt everthing including /boot and /root
2. Enter password once
3. Support UEFI

Installation media setup

Download NixOS minimal iso and copy to USB stick. For example on Mac OSX

$ diskutil list
$ diskutil unmountDisk /dev/disk1 # Make sure you got right device

byrongibson

Setting up NixOs with LUKS encrypted root

Here are my working notes on getting a system up and running.

WARNING: You can run into a hidden problem that will prevent a correct partition setup and /etc/nixos/configuration.nix from working: if you are setting up a UEFI system, then you need to make sure you boot into the NixOS installation from the UEFI partition of the bootable media. You may have to enter your BIOS boot selection menu to verify this. For example, if you setup a NixOS installer image on a flash drive, your BIOS menu may display several boot options from that flash drive: choose the one explicitly labeled with “UEFI”.

References

I used these resources:

byrongibson

NixOS with ZFS on LUKS

After some effort (and asking for help on the nix-dev mailing list) I installed ZFS on an encrypted partition. The relevant configuration is below.

• Installing
  • Use keyfile
  • Configure passphrase
• Configure without passphrase

byrongibson

#!/usr/bin/env bash

# NixOS install with encrypted root and swap
#
# sda
# ├─sda1            BOOT
# └─sda2            LINUX (LUKS CONTAINER)
#   └─cryptroot     LUKS MAPPER
#     └─cryptroot1  SWAP
#     └─cryptroot2  ZFS

byrongibson

#!/usr/bin/env bash

#
# NixOS install script synthesized from:
#
#   - Erase Your Darlings (https://grahamc.com/blog/erase-your-darlings)
#   - ZFS Datasets for NixOS (https://grahamc.com/blog/nixos-on-zfs)
#   - NixOS Manual (https://nixos.org/nixos/manual/)
#
# It expects the name of the block device (e.g. 'sda') to partition

byrongibson

    # First run:
    apt-get install apt-cacher python-vm-builder
    vi /etc/default/apt-cacher # ensure autostart is enabled
    sudo service apt-cacher start

    git clone git://github.com/bitcoin/bitcoin.git
    git clone git://github.com/devrandom/gitian-builder.git
    mkdir gitian-builder/inputs
    wget 'http://miniupnp.tuxfamily.org/files/download.php?file=miniupnpc-1.5.tar.gz' -O gitian-builder/inputs/miniupnpc-1.5.tar.gz
    wget 'http://downloads.sourceforge.net/project/wxwindows/2.9.1/wxWidgets-2.9.1.tar.bz2' -O gitian-builder/inputs/wxWidgets-2.9.1.tar.bz2