add local fetcher

lib/fetchers/local.rb

@@ -0,0 +1,31 @@
+# encoding: utf-8
+# author: Dominik Richter
+# author: Christoph Hartmann
+
+module Fetchers
+  class Local < Inspec.fetcher(1)
+    name 'local'
+    priority 0
+
+    attr_reader :files
+
+    def self.resolve(target)
+      return nil unless File.exist?(target)
+      new(target)
+    end
+
+    def initialize(target)
+      if File.file?(target)
+        @files = [target]
+      else
+        @files = Dir[File.join(target, '**', '*')]
+      end
+    end
+
+    def read(file)
+      return nil unless files.include?(file)
+      return nil unless File.file?(file)
+      File.read(file)
+    end
+  end
+end

lib/inspec/fetcher.rb

@@ -35,3 +35,5 @@ module Inspec
     Inspec::Plugins::Fetcher
   end
 end
+
+require 'fetchers/local'

test/unit/fetchers.rb

@@ -0,0 +1,12 @@
+# encoding: utf-8
+# author: Dominik Richter
+# author: Christoph Hartmann
+
+require 'helper'
+
+describe Inspec::Fetcher do
+  it 'loads the local fetcher for this file' do
+    res = Inspec::Fetcher.resolve(__FILE__)
+    res.must_be_kind_of Fetchers::Local
+  end
+end

test/unit/fetchers/local_test.rb

@@ -0,0 +1,65 @@
+# encoding: utf-8
+# author: Dominik Richter
+# author: Christoph Hartmann
+
+require 'helper'
+
+describe Fetchers::Local do
+  let(:fetcher) { Fetchers::Local }
+
+  it 'registers with the fetchers registry' do
+    reg = Inspec::Fetcher.registry
+    _(reg['local']).must_equal fetcher
+  end
+
+  describe 'applied to this file' do
+    let(:res) { fetcher.resolve(__FILE__) }
+
+    it 'must be resolved' do
+      _(res).must_be_kind_of fetcher
+    end
+
+    it 'must only contain this file' do
+      _(res.files).must_equal [__FILE__]
+    end
+
+    it 'must not read if the file doesnt exist' do
+      _(res.read(rand.to_s)).must_be_nil
+    end
+
+    it 'must not read files not covered' do
+      _(File.file?('/proc/cpuinfo')).must_equal true
+      _(res.read('/proc/cpuinfo')).must_be_nil
+    end
+
+    it 'must read the contents of the file' do
+      _(res.read(__FILE__)).must_equal File.read(__FILE__)
+    end
+  end
+
+  describe 'applied to this folder' do
+    let(:path) { File.dirname(__FILE__) }
+    let(:res) { fetcher.resolve(path) }
+
+    it 'must be resolved' do
+      _(res).must_be_kind_of fetcher
+    end
+
+    it 'must contain all files' do
+      _(res.files).must_include __FILE__
+    end
+
+    it 'must not read if the file doesnt exist' do
+      _(res.read(rand.to_s)).must_be_nil
+    end
+
+    it 'must not read files not covered' do
+      _(File.file?('/proc/cpuinfo')).must_equal true
+      _(res.read('/proc/cpuinfo')).must_be_nil
+    end
+
+    it 'must read the contents of the file' do
+      _(res.read(__FILE__)).must_equal File.read(__FILE__)
+    end
+  end
+end