apt: add support for ppa.

Add an ppa option to install from Ubuntu PPA.

lib/sprinkle/installers/apt.rb

@@ -1,11 +1,12 @@
 module Sprinkle
   module Installers
     # The Apt package installer uses the +apt-get+ command to install
-    # packages. The apt installer has only one option which can be
+    # packages. The apt installer has one option which can be
     # modified which is the +dependencies_only+ option. When this is
     # set to true, the installer uses +build-dep+ instead of +install+
-    # to only build the dependencies.
-    # 
+    # to only build the dependencies. If you want to install from Ubuntu
+    # PPA, set the `ppa` option.
+    #
     # == Example Usage
     #
     # First, a simple installation of the magic_beans package:
@@ -19,23 +20,31 @@ module Installers
     #
     #   package :magic_beans_depends do
     #     apt 'magic_beans_package' do
-    #       dependencies_only true 
+    #       dependencies_only true
+    #     end
+    #   end
+    #
+    # Third, get magic_beans from ppa:user/ppa-name:
+    #
+    #   package :magic_beans do
+    #     apt 'magic_bean' do
+    #       ppa 'user/ppa-name'
     #     end
     #   end
     #
     # As you can see, setting options is as simple as creating a
-    # block and calling the option as a method with the value as 
+    # block and calling the option as a method with the value as
     # its parameter.
     class Apt < PackageInstaller
       def initialize(parent, *packages, &block) #:nodoc:
         super parent, *packages, &block
-        @options.reverse_merge!(:dependencies_only => false)
+        @options.reverse_merge!(:dependencies_only => false, :ppa => nil)
       end
-      
-      attributes :dependencies_only
+
+      attributes :dependencies_only, :ppa
 
       auto_api
-      
+
       verify_api do
         def has_apt(package)
           @commands << "dpkg --status #{package} | grep \"ok installed\""
@@ -44,12 +53,32 @@ def has_apt(package)
 
       protected
 
+        def ppa_repository_exist?(ppa) #:nodoc:
+          ppa_user, ppa_name = ppa.split('/')
+          sources_glob = ['/etc/apt/sources.list', '/etc/apt/sources.list.d/*.list']
+          ppa_pattern = /^deb http:\/\/ppa.launchpad.net\/#{ppa}/
+          Dir.glob(sources_glob).any? do |f|
+            open(f).any? do |line|
+              line =~ ppa_pattern
+            end
+          end
+        end
+
         def install_commands #:nodoc:
           command = @options[:dependencies_only] ? 'build-dep' : 'install'
           noninteractive = "#{sudo_cmd}env DEBCONF_TERSE='yes' DEBIAN_PRIORITY='critical' DEBIAN_FRONTEND=noninteractive"
-          "#{noninteractive} apt-get --force-yes -qyu #{command} #{@packages.join(' ')}"
+          if @options[:ppa]
+            ppa = @options[:ppa]
+	    unless ppa_repository_exist?(ppa)
+              add_ppa = "#{sudo_cmd}add-apt-repository ppa:#{ppa}"
+              apt_update = "#{noninteractive} apt-get update"
+              ppa_cmd = "#{add_ppa} && #{apt_update} &&"
+            end
+          end
+          "#{ppa_cmd} #{noninteractive} apt-get --force-yes -qyu #{command} #{@packages.join(' ')}"
         end
 
+
     end
   end
 end

spec/sprinkle/installers/apt_spec.rb

@@ -5,7 +5,7 @@
   before do
     @package = create_pkg "name", :use_sudo => false
   end
-  
+
   def create_pkg(name="name", opts={})
     @package = Sprinkle::Package::Package.new(name) {}
     @package.use_sudo opts[:use_sudo]
@@ -34,7 +34,7 @@ def create_apt(*debs, &block)
     end
 
   end
-  
+
 
   describe 'during installation' do
 
@@ -45,14 +45,14 @@ def create_apt(*debs, &block)
       end
       @install_commands = @installer.send :install_commands
     end
-    
+
     it 'should use sudo if package specifies' do
       @package = create_pkg "name", :use_sudo => true
       @installer = create_apt 'ruby'
       @install_commands = @installer.send :install_commands
       @install_commands.should =~ /sudo env/
     end
-    
+
     it 'should use sudo if installer specifies' do
       @package = create_pkg "name", :use_sudo => false
       @installer = create_apt 'ruby', :sudo => true
@@ -78,7 +78,7 @@ def create_apt(*debs, &block)
     end
 
   end
-  
+
   describe 'during dependencies only installation' do
 
     before do
@@ -89,7 +89,19 @@ def create_apt(*debs, &block)
     it 'should invoke the apt installer with build-dep command for all specified packages' do
       @install_commands.should =~ /apt-get --force-yes -qyu build-dep ruby/
     end
-    
+
   end
 
+  describe 'during installation from a Ubuntu PPA' do
+
+    before do
+      # We use the (outdated) ppa name in launchpad help:
+      # https://help.launchpad.net/Packaging/PPA/InstallingSoftware
+      @installer = create_apt('gwibber') { ppa 'gwibber-daily/ppa'}
+      @install_commands = @installer.send :install_commands
+    end
+
+    it 'should add the PPA repository before invoking apt-get' do
+      @install_commands.should =~ /add-apt-repository ppa:/
+    end
 end