Mic92

parallel_map() {
    local func="$1"

    local num_cores
    num_cores=$(nproc 2>/dev/null || echo 4)
    local pipe_buf_size
    pipe_buf_size=$(getconf PIPE_BUF / 2>/dev/null || echo 4096)
    local tmpdir
    tmpdir=$(mktemp -d)
    trap 'rm -rf "$tmpdir"' EXIT

Mic92

## USAGE
# $ nix-build kexec-installer.nix
# can be deployed remote like this
# $ rsync -aL -e ssh result/ root@host:
# $ ssh root@host ./kexec-installer
## Customize it like this
# # custom-installer.nix
# import ./kexec-installer.nix {
#   extraConfig = {pkgs, ... } {
#     user.extraUsers.root.openssh.authorizedKeys.keys = [ "<your-key>" ];

Mic92

From 3ceb739b696ac712dddfc6acf1f88e492d6f07d3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rg=20Thalheim?= <joerg@thalheim.io>
Date: Sat, 20 Jul 2024 10:23:57 +0200
Subject: [PATCH] detect systemd by name rather than relying on
 SYSTEMD_BINARY_PATH
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

This allows us in NixOS to run systemd binaries from the nix store

Mic92

#/bin/sh

# save as /usr/local/bin/gitolite-anongit
# and chmod +x /usr/local/bin/gitolite-anongit
# ForceCommand may depend on the gitolite distribution
/usr/share/gitolite/gl-auth-command anongit "$@"

Mic92

#!/bin/bash

set -eux -o pipefail

# Create mount point if it doesn't exist
mkdir -p /run/testmount

# Clean up on exit
trap 'umount /run/testmount; rmdir /run/testmount' EXIT

Mic92

Tvix is a new implementation of the Nix language and package manager. In this benchmark we test it's performance when instantiating the hello package from nix. Note that at the time tvix does not have its own store implementation yet and it has to execute nix-store whenever it needs to copy files to the store.

Mic92

{ pkgs, config, ... }:
{
  nixpkgs.config.allowUnfree = true;
  nixpkgs.config.nvidia.acceptLicense = true;
  # enable the nvidia driver
  services.xserver.videoDrivers = [ "nvidia" ];
  hardware.opengl.enable = true;
  hardware.nvidia.datacenter.enable = true;
  hardware.nvidia.package = config.boot.kernelPackages.nvidiaPackages.dc_535;

Mic92

hyperfine --show-output 'rm -R ~/.cache/nix/binary-cache-*.sqlite*; rm -rf /tmp/cache; nix copy --from "{url}" --to "file:///tmp/cache?compression=none" /nix/store/jlkypcf54nrh4n6r0l62ryx93z752hb2-firefox-132.0' -L url https://nixos.tvix.store,https://cache.nixos.org/
Benchmark 1: rm -R ~/.cache/nix/binary-cache-*.sqlite*; rm -rf /tmp/cache; nix copy --from "https://nixos.tvix.store" --to "file:///tmp/cache?compression=none" /nix/store/jlkypcf54nrh4n6r0l62ryx93z752hb2-firefox-132.0
  Time (mean ± σ):      5.090 s ±  0.113 s    [User: 4.721 s, System: 2.555 s]
  Range (min … max):    4.942 s …  5.332 s    10 runs

Benchmark 2: rm -R ~/.cache/nix/binary-cache-*.sqlite*; rm -rf /tmp/cache; nix copy --from "https://cache.nixos.org/" --to "file:///tmp/cache?compression=none" /nix/store/jlkypcf54nrh4n6r0l62ryx93z752hb2-firefox-132.0
  Time (mean ± σ):      6.729 s ±  0.148 s    [User: 15.829 s, System: 2.904 s]
  Range (min … max):    6.560 s …  7.049 s    10 runs

Mic92

diff --git a/nixos/modules/system/etc/build-composefs-dump.py b/nixos/modules/system/etc/build-composefs-dump.py
index fe739a621ec4..42287ea35842 100644
--- a/nixos/modules/system/etc/build-composefs-dump.py
+++ b/nixos/modules/system/etc/build-composefs-dump.py
@@ -1,5 +1,3 @@
-#!/usr/bin/env python3
-
 """Build a composefs dump from a Json config
 
 See the man page of composefs-dump for details about the format:

Mic92

// This code was autogenerated with `dbus-codegen-rust `, see https://github.com/diwic/dbus-rs
use dbus as dbus;
#[allow(unused_imports)]
use dbus::arg;
use dbus::blocking;

pub trait OrgFreedesktopDBusPeer {
    fn ping(&self) -> Result<(), dbus::Error>;
    fn get_machine_id(&self) -> Result<String, dbus::Error>;
}