onny

Scanning for Btrfs filesystems
registered: /dev/vda3
mounting /dev/disk/by-label/NIXOS_SD on /...
[   15.589159] BTRFS: device label NIXOS_SD devid 1 transid 13 /dev/vda3 (254:3) scanned by mount (193)
[   15.597953] BTRFS info (device vda3): first mount of filesystem 44444444-4444-4444-8888-888888888888
[   15.637722] BTRFS info (device vda3): using crc32c (crc32c-lib) checksum algorithm
[   15.881840] BTRFS info (device vda3): turning on async discard
[   15.882129] BTRFS info (device vda3): enabling free space tree
[   15.882451] BTRFS info (device vda3): use zstd compression, level 3
mount: /mnt-root/run: filesystem was mounted, but failed to update userspace mount table.

onny

Setting up qemu VM using nix flakes

Did you know that it is rather easy to setup a VM to test your NixOs configuration?

Create simple flake:

# flake.nix
{
  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

onny

wget http://dl-cdn.alpinelinux.org/alpine/v3.15/releases/armv7/alpine-uboot-3.15.0-armv7.tar.gz
wget http://dl-cdn.alpinelinux.org/alpine/v3.15/releases/armv7/alpine-minirootfs-3.15.0-armv7.tar.gz

qemu-img create -f raw sd.img 512M

sudo losetup /dev/loop0 sd.img 
sudo kpartx -av /dev/loop0
lsblk
sudo mkfs.ext4 /dev/mapper/loop0p1
mount /dev/mapper/loop0p1 /mnt

onny

Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36 Signal-Desktop/0.12.1
2016-05-14T13:15:46.678Z GET https://textsecure-service-ca.whispersystems.org:4433/v1/devices 200 Success
2016-05-14T13:15:46.680Z opening websocket
2016-05-14T13:15:47.055Z websocket open
2016-05-14T13:17:16.251Z websocket closed 1006 
2016-05-14T13:17:16.255Z GET https://textsecure-service-ca.whispersystems.org:4433/v1/devices
2016-05-14T13:17:16.672Z GET https://textsecure-service-ca.whispersystems.org:4433/v1/devices 200 Success
2016-05-14T13:17:16.675Z opening websocket
2016-05-14T13:17:17.058Z websocket open
2016-05-14T13:18:46.253Z websocket closed 1006 

onny

#!/usr/bin/python

from bottle import route, run, template, request

@route('/hello/<name>')
def index(name):
	prename = request.query['prename']
	return template('<b>Hello {{prename}} {{name}}</b>!', name=name, prename=prename)

run(host='localhost', port=8080)

onny

from I2C import *
import time

timestring = time.strftime("%Y-%m-%d %H:%M:%S")
i2caddr = 0x0B # Slave address of battery controller

def get_word(i2c, i2caddr, addr):
    """ Reads two byte value (big-endian) from address addr """
    i2c.send_start_bit();
    stat = i2c.bulk_trans(2, [i2caddr<<1, addr]);