Make tar download path configurable to support local sources.

Simple approach to solve garethr#13. RPM/DEB-based approach is more
difficult as paths differ between archive and packages.

README.md

@@ -35,6 +35,14 @@ configuration file.
 In this last case you're responsible for making sure that file exists,
 via another puppet resource or otherwise.
 
+By default, the riemann archive is downloaded from aphyr.com. If you
+want to supply your own download location, set it as follows:
+
+    class { 'riemann': archive_download_base_path => 'http://some.domain/path' }
+
+Note that the archive has be called `riemann-${version}.tar.bz2` and
+has to have the same structure as the one provided by aphyr.com.
+
 ## Example
 
 For a fully working example of this module you may also be interested in

manifests/init.pp

@@ -20,12 +20,17 @@
 #   The system user which riemann runs as. Defaults to riemann. Will be
 #   created by the module.
 #
+# [*archive_dowload_base_path*]
+#   The base path (URL) where the riemann tar.bz2 file resides. Defaults
+#   to the primary distribution location on aphyr.com
+
 class riemann(
   $version = $riemann::params::version,
   $config_file = $riemann::params::config_file,
   $host = $riemann::params::host,
   $port = $riemann::params::port,
   $user = $riemann::params::user,
+  $archive_download_base_path = $riemann::params::archive_download_base_path,
 ) inherits riemann::params {
 
   validate_absolute_path($config_file)

manifests/install.pp

@@ -16,7 +16,7 @@
   }
 
   wget::fetch { 'download_riemann':
-    source      => "http://aphyr.com/riemann/riemann-${riemann::version}.tar.bz2",
+    source      => "${riemann::archive_download_base_path}/riemann-${riemann::version}.tar.bz2",
     destination => "/usr/local/src/riemann-${riemann::version}.tar.bz2",
     before      => Exec['untar_riemann'],
   }

manifests/params.pp

@@ -10,6 +10,7 @@
   $host = 'localhost'
   $user = 'riemann'
   $rvm_ruby_string = undef
+  $archive_download_base_path = 'http://aphyr.com/riemann'
 
   case $::osfamily {
     'Debian': {

spec/classes/riemann/riemann_spec.rb

@@ -49,6 +49,21 @@
     it { should contain_file('/etc/puppet/riemann.yaml').with_content(/6000/)}
   end
 
+  context 'without a custom tar download path' do
+    let(:params) { {'version' => '1.0.0'} }
+    it 'should download the riemann archive from default location' do
+      should contain_wget__fetch('download_riemann').with_source('http://aphyr.com/riemann/riemann-1.0.0.tar.bz2')
+      end
+  end
+
+  context 'with a custom tar download path' do
+    let(:params) { {'archive_download_base_path' => 'https://custom.domain/custom_path',
+        'version' => '1.0.0'} }
+    it 'should download the riemann archive from the custom location' do
+      should contain_wget__fetch('download_riemann').with_source('https://custom.domain/custom_path/riemann-1.0.0.tar.bz2')
+    end
+  end
+
   context 'with an invalid config file path' do
     let(:params) { {'config_file' => 'not a path'} }
     it do