first commit

Author: andykent

LICENSE

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+Copyright (c) 2012 Andrew Kent
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+#!/usr/bin/env ruby
+
+arg_command = ARGV.shift
+arg_package = ARGV.shift
+arg_node    = ARGV.shift
+
+
+require_relative "../lib/hull"
+include Hull::DSL
+
+require Dir.pwd + '/config/hull'
+
+
+if arg_command == 'apply'
+  apply(arg_node, arg_package, :install)
+else
+  demonstrate(arg_node, arg_package, :install)
+end

bin/hull

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+load_package 'apt'
+
+
+package 'ubuntu-dev' do
+  depends_on 'build-essential'
+  depends_on 'git'
+end
+
+package 'build-essential' do
+  depends_on 'apt'
+
+  install do
+    trigger 'apt:install', 'build-essential'
+  end
+
+  remove do
+    trigger 'apt:remove', 'build-essential'
+  end
+end
+
+
+package 'git' do
+  install do
+    trigger 'apt:install', 'git-core'
+  end
+
+  remove do
+    trigger 'apt:remove', 'git-core'
+  end
+end
+
+
+node 'kent-web-1', '198.211.122.159'
+
+
+
+# apply 'kent-web-1', 'ubuntu-dev', :install
+# demonstrate '198.211.122.159', 'ubuntu-dev', :install

config/hull.rb

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+Gem::Specification.new do |gem|
+  gem.authors       = ["Andy Kent"]
+  gem.email         = ["[email protected]"]
+  gem.description   = %q{Simplified Machine Building}
+  gem.summary       = %q{Simplified Machine Building}
+  gem.homepage      = ""
+
+  gem.files         = `git ls-files`.split($\)
+  gem.executables   = gem.files.grep(%r{^bin/}).map{ |f| File.basename(f) }
+  gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
+  gem.name          = "hull"
+  gem.require_paths = ["lib"]
+  gem.version       = '0.1.0'
+  gem.add_dependency('colored')
+  gem.add_dependency('net-ssh')
+end

hull.gemspec

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+require 'colored'
+
+module Hull; end
+
+require_relative "./hull/package"
+require_relative "./hull/package_index"
+require_relative "./hull/node"
+require_relative "./hull/runner"
+require_relative "./hull/dsl"

lib/hull.rb

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+module Hull
+  module DSL
+    module_function
+    def package(name, &definition)
+      pkg = Hull::Package.new(name)
+      pkg.instance_eval(&definition)
+      Hull::PackageIndex.default.add(pkg)
+    end
+
+    def apply(node_name, pkg_name, command)
+      node = Hull::Node.find(node_name)
+      pkg = Hull::PackageIndex.default.get(pkg_name)
+      Hull::Runner.new(node, pkg).apply(command)
+    end
+
+    def demonstrate(node_name, pkg_name, command)
+      node = Hull::Node.find(node_name)
+      pkg = Hull::PackageIndex.default.get(pkg_name)
+      Hull::Runner.new(node, pkg).demonstrate(command)
+    end
+
+    def load_package(name)
+      require_relative("./packages/#{name}")
+    end
+
+    def node(name, host)
+      Hull::Node.new(name, host)
+    end
+  end
+end

lib/hull/dsl.rb

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+require 'net/ssh'
+
+class Hull::Node
+  attr_reader :name
+
+  def self.find(name)
+    @nodes[name]
+  end
+
+  def self.register(node)
+    @nodes ||= {}
+    @nodes[node.name] = node
+  end
+
+  def initialize(name, host)
+    @name = name
+    @host = host
+    @connection = nil
+    Hull::Node.register(self)
+  end
+
+  def execute(cmd)
+    log('execute', cmd.cyan)
+    connection.exec! cmd do |channel, stream, data|
+      data.split("\n").each do |line|
+        msg = stream == :stdout ? line.green : line.red
+        log(stream, msg)
+      end
+    end
+  end
+
+  def log(context, msg)
+    puts "#{@host} [#{context.to_s.bold}] #{msg}"
+  end
+
+  def connection
+    return @connection if @connection
+    @connetion = Net::SSH.start(@host, 'root')
+  end
+end
+
+
+class Hull::MockNode
+  def execute(cmd)
+    log('execute', cmd)
+  end
+end

lib/hull/node.rb

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+class Hull::Package
+  attr_reader :name, :dependancies, :actions
+
+  def initialize(name)
+    @name = name
+    @dependancies = []
+    @actions = {}
+    @commands = {}
+    @remove = nil
+  end
+
+  def depends_on(pkg_name)
+    @dependancies << pkg_name
+  end
+
+  def install(&definition)
+    @commands[:install] = definition
+  end
+
+  def remove(&definition)
+    @commands[:remove] = definition
+  end
+
+  def action(name, &definition)
+    @actions[name] = definition
+  end
+
+  def command(name)
+    @commands[name.to_sym]
+  end
+
+  def provides_command?(name)
+    !command(name).nil?
+  end
+end

lib/hull/package.rb

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+class Hull::PackageIndex
+  attr_reader :index_name
+
+  def initialize(index_name)
+    @index_name = index_name
+    @packages = {}
+  end
+
+  def self.default
+    @default ||= new('default')
+  end
+
+  def add(pkg)
+    @packages[pkg.name] = pkg
+  end
+
+  def get(pkg_name)
+    pkg = @packages[pkg_name]
+    raise "Missing Package #{pkg_name}" if pkg.nil?
+    pkg
+  end
+end

lib/hull/package_index.rb

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+module Hull::DSL
+  package 'apt' do
+    action 'install' do |package_name|
+      run "DEBIAN_FRONTEND=noninteractive apt-get install -y -q #{package_name}"
+    end
+
+    action 'remove' do |package_name|
+      run "DEBIAN_FRONTEND=noninteractive apt-get remove -y -q #{package_name}"
+    end
+  end
+end

lib/hull/packages/apt.rb

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+class Hull::Runner
+  def initialize(node, package)
+    @node = node
+    @package = package
+    @perform = true
+  end
+
+  def packages
+    resolver = Hull::Resolver.new(@package)
+    resolver.resolve
+    resolver.packages
+  end
+
+  def apply(command_name)
+    packages.each do |pkg|
+      next unless pkg.provides_command?(command_name)
+      @node.log pkg.name, command_name.to_s.yellow
+      context = @perform ? Hull::ExecutionContext.new(@node) : Hull::MockExecutionContext.new(@node)
+      cmd = pkg.command(command_name)
+      context.apply(cmd)
+    end
+  end
+
+  def demonstrate(command_name)
+    @perform = false
+    apply(command_name)
+    @perform = true
+  end
+end
+
+
+class Hull::ExecutionContext
+  def initialize(node)
+    @node = node
+  end
+
+  def apply(blk)
+    instance_eval(&blk)
+  end
+
+  def run(cmd)
+    @node.execute(cmd)
+  end
+
+  def trigger(action, *args)
+    pkg_name, action_name = *action.split(':', 2)
+    pkg = Hull::PackageIndex.default.get(pkg_name)
+    action = pkg.actions[action_name]
+    instance_exec(*args, &action)
+  end
+end
+
+class Hull::MockExecutionContext < Hull::ExecutionContext
+  def run(cmd)
+    @node.log 'mock-execute', cmd
+  end
+end
+
+
+class Hull::Resolver
+  attr_reader :packages
+  def initialize(package)
+    @package = package
+    @packages = [@package]
+  end
+
+  def resolve
+    dependancies = @package.dependancies.map { |d| Hull::PackageIndex.default.get(d) }
+    @packages += dependancies.map {|d| Hull::Resolver.new(d).resolve.packages }
+    @packages.flatten!
+    @packages.reverse!
+    @packages.uniq!
+    self
+  end
+end