Wael Nasreddine kalbasit

Last Updated: March 2023

IMPORTANT: Ignore the out-of-date steps below for getting Chromium keys.

Instead, read this up-to-date guide (Jan 2023) written by @LearningToPi.

P.S. Thank you to every contributor below who provided tips over the years on what should be a straightforward process: setting up Chromium for local development.

Long live the web!

General notes

nix-channel and ~/.nix-defexpr are gone. We'll use $NIX_PATH (or user environment specific overrides configured via nix set-path) to look up packages. Since $NIX_PATH supports URLs nowadays, this removes the need for channels: you can just set $NIX_PATH to e.g. https://nixos.org/channels/nixos-15.09/nixexprs.tar.xz and stay up to date automatically.
By default, packages are selected by attribute name, rather than the name attribute. Thus nix install hello is basically equivalent to nix-env -iA hello. The attribute name is recorded in the user environment manifest and used in upgrades. Thus (at least by default) hello won't be upgraded to helloVariant.

@vcunat suggested making this an arbitrary Nix expression rather than an attrpath, e.g. firefox.override { enableFoo = true; }. However, such an expression would not have a key in the user environment, unlike an attrpath. Better to require an explicit flag for this.

TBD: How to deal with search path clashes.

Problems & Solutions for Interaction Between C and Go

At Vimeo, on the transcoding team, we work a lot with Go, and a lot with C, for various tasks such as media ingest. This means we use CGO quite extensively, and consequently, have run into bits that are perhaps not very well documented, if at all. Below is my effort to document some of the problems we've run into, and how we fixed or worked around them.

Many of these are obviously wrong in retrospect, but hindsight is 20/20, and these problems do exist in many codebases currently.

Some are definitely ugly, and I much welcome better solutions! Tweet me at @daemon404 if you have any, or have your own CGO story/tips, please! I'd love to learn of them.

Table of Contents

	{ lib, config, pkgs, ... }:

	{
	imports = [ ./iscsi-boot.nix ];
	fileSystems = {
	"/" = { device = "UUID=132e7c5b-b4a9-4154-8105-4479e17f4f5b"; fsType = "ext4"; };
	"/boot/" = { device = "UUID=fdac080d-d111-455c-a890-bc3e5e08c2d5"; fsType = "ext4"; };
	};
	boot = {
	loader = {

	#!/bin/bash

	# Runs the specified command (provided by the first argument) in all tmux panes
	# in every window. If an application is currently running in a given pane
	# (e.g., vim), it is suspended and then resumed so the command can be run.
	all-panes()
	{
	all-panes-bg_ "$1" &
	}

	VAGRANTFILE_API_VERSION = '2'

	$install = <<SCRIPT
	curl -L https://github.com/docker/fig/releases/download/1.0.1/fig-`uname -s`-`uname -m` > /usr/local/bin/fig
	chmod +x /usr/local/bin/fig
	SCRIPT

	$build = <<SCRIPT
	cd /vagrant
	fig build

	#!/bin/bash

	VERSION_URL="https://appengine.google.com/api/updatecheck"
	VERSION=$(echo $(curl ${VERSION_URL}) \| sed -E 's/release: \"(.+)\"(.*)/\1/g')

	ARCH="386"
	if [[ `uname -a` == x86_64 ]]
	then
	ARCH="amd64"
	fi

	next-server 10.0.3.2;
	if ( substring(option vendor-class-identifier, 0, 9) = "AAPLBSDPC"
	and substring(option vendor-class-identifier, 10, 4) = "i386" ) {
	# This needs to be there to tell the client we're an Apple boot server
	option vendor-class-identifier "AAPLBSDPC";
	# Normally the client asks for a list, we respond, they tell us what we want,
	# then we send a select back with the information of that image.
	# This skips all that and forces the select down to the client.
	option vendor-encapsulated-options 01:01:02;
	# Use ipxe.efi for native drivers, or snponly.efi for underlying UNDI

	// EDIT: SOLVED!
	// The arguments are supposed to be
	// [--no-pager log --all --source --abbrev-commit --grep=Story-Id: 12345]
	// not
	// [--no-pager log --all --source --abbrev-commit --grep='Story-Id: 12345']
	// because then it doesn't find the commits and then output is empty.

	// The problem is that my function is returning empty stdout buffer
	// even though the output is not empty when I run git from CLI.
	//

	/*
	This code Do the following stuff :
	1) login to a website called : website.com by submitting password and username on the page with url :- http://website.com/login
	2) Now after login using the cookies stored by this webiste access user profile page
	3) Now using same client which stored the required cookies make another post request to user profile page present at page :-
	http://website.com/upser_profile_page .
	4) Now get html of this whole page and print it in log as a string .

	*/