Attila Gulyas toraritte

Standard project structure

This is a project structure I’ve found useful. Looking for any thoughts/comments/feedback. Roughly, I found a tension between the style nixpkgs expects and the style conducive to development, so I extracted the common portion into a derivation.nix which is used by the remaining .nix files. This setup allows me to use nix build, nix-shell, overlays, Hydra, alternate packaging schemes, cross-compiling, etc.

FOREWORDS

I don't mean the snippet at the bottom of this gist to be a generic plug-n-play solution to your search needs. It is very likely to not work for you or even break things, and it certainly is not as extensively tested and genericised as your regular third-party plugin.

My goal, here and in most of my posts, is to show how Vim's features can be leveraged to build your own high-level, low-maintenance, workflows without systematically jumping on the plugins bandwagon or twisting Vim's arm.

Instant grep + quickfix

Lisanna's eclectic nix troubleshooting guide for suicidal power users

tar fails with exit code 1

unpacking 'https://example.com/nixexprs.tar.xz'...
tar: Error opening archive: Failed to open '/nix/store/411sszfqfya5ad2wllmqcr15z5d30575-nixexprs.tar.xz'
error: program 'tar' failed with exit code 1

Discussion:

Nix CA Certificate Handling

Some applications requires contacting HTTPS endpoints. In those cases you need to supply the CA certificates.

Most Nix applications won't package in the CA certificates, this is because they can make use of the OS provided CA certificate store.

The NixOS location for this is at: /etc/ssl/certs.

The OpenSSL library in Nixpkgs is compiled to use that path if there is no environment variables such as SSL_CERT_FILE.

An Illustration of a Nix C Package

The pkgs.nix:

import (fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/4df3426f5a5e78cef4835897a43abd9e2a092b74.tar.gz) {}

The default.nix:

	with import <nixpkgs> {};

	let
	path = ./mwe;
	string = "./mwe";
	pathPath = path + /test/file.nix;
	pathString = path + "/test/file.nix";
	pathStringPath = path + "/test" + /file.nix;
	stringPath = string + /test/file.nix;
	stringPathWorking = string + /nix/var/nix/db/schema;

	{ nixpkgs ? import <nixpkgs> {}
	, version ? "0.1"
	, proxy ? "http://10.183.23.58:3128"
	}:

	with nixpkgs;

	let
	elixir = beam.packages.erlangR21.elixir_1_7;
	nodejs = nodejs-10_x;

	#!/bin/sh

	echo

	if [ ! -d "deps" ] \|\| [ ! "$(ls -A deps)" ]; then
	printf "\e[32m=> Fetching dependencies and building the application...\e[0m\n\n"
	echo "+ mix do deps.get, compile --verbose"
	mix do deps.get, compile --verbose
	echo
	fi

	{ pkgs ? import <nixpkgs> {} }:

	with pkgs;

	let
	inherit (lib) optional optionals;

	elixir = beam.packages.erlangR21.elixir_1_7;
	nodejs = nodejs-10_x;
	postgresql = postgresql100;