Kostas vrinek

Store Nix store in git

The Nix store is an immutable file tree store, addressed by output hashes ($outhash-$name or $out), but could also be tweaked to be addressed by the content hash of the file tree ($cas).

Git is a content-addressed immutable object store. It is optimized for storing files as blobs and directories as tree objects.

Here we consider using a git repository for deduplicating, compressing and distributing the Nix store. We want to achieve maximum deduplication so we extract small changes from files before storing, so they become more similar.

	module ArrayMatching
	class ArrayMatching
	def initialize(array)
	@array = array
	end

	def ==(other_array)
	Set.new(@array) == Set.new(other_array)
	end

	# Weighted Moving Average (WMA)
	# http://en.wikipedia.org/wiki/Moving_average#Weighted_moving_average
	#
	# Given a hash, calculates the weighted moving averages of its values within
	# a window size given. Modifies the original hash values.
	#
	# @param hash [Hash] the hash for whom values calculate the weighted moving
	# averages.
	# @param maws [Fixnum] the Moving Average Window Size. The greatest this
	# number is the smoothest the calculated averages will be.

	#!/usr/bin/env ruby

	# A simply utility to show character counts for each line of input and
	# highlight lines longer than 80 characters.
	#
	# Written as an example for http://jstorimer.com/2011/12/12/writing-ruby-scripts-that-respect-pipelines.html
	#
	# Examples:
	#
	# $ hilong Gemfile

	#!/bin/sh

	# Via http://tbaggery.com/2011/02/07/bundle-while-you-git.html
	# Save as http://.git/hooks/post-checkout in your project and `chmod +x`
	# See the post for how to tell Git you want this in new/newly cloned repos

	if [ $1 = 0000000000000000000000000000000000000000 ]; then
	# Special case for initial clone: compare to empty directory.
	old=4b825dc642cb6eb9a060e54bf8d69288fbee4904
	else

	=Navigating=
	visit('/projects')
	visit(post_comments_path(post))

	=Clicking links and buttons=
	click_link('id-of-link')
	click_link('Link Text')
	click_button('Save')
	click('Link Text') # Click either a link or a button
	click('Button Value')

Kostas vrinek

Store Nix store in git

Method

Pong

Gosu

Libraries to use with Gosu