[feat] Add guess_apache_version() function

Try to guess the version of apache to be installed.
Certain apache modules depend on each other, so we
need to evaluate the apache version before it gets
installed. This function decides which apache version
is going to be installed based on the `operatingsystemmajrelease`
fact.

2 files changed, 89 insertions, 0 deletions

diff --git a/lib/puppet/parser/functions/guess_apache_version.rb b/lib/puppet/parser/functions/guess_apache_version.rb
new file mode 100644
index 0000000..7537f6d
--- /dev/null
+++ b/lib/puppet/parser/functions/guess_apache_version.rb
@@ -0,0 +1,39 @@
+# Try to guess the version of apache to be installed.
+# Certain apache modules depend on each other, so we
+# need to evaluate the apache version before it gets
+# installed. This function decides which apache version
+# is going to be installed based on the `operatingsystemrelease`
+# fact.
+module Puppet::Parser::Functions
+  newfunction(:guess_apache_version, :type => :rvalue) do |args|
+    release = lookupvar('operatingsystemrelease')
+    unknown = 'unknown'
+
+    case lookupvar('operatingsystem')
+
+      when 'Debian'
+        case release
+          when /^7.*/
+            version = '2.2'
+          when /^8.*/
+            version = '2.4'
+          else
+            version = unknown
+        end
+
+      when 'Ubuntu'
+        case release
+          when /(12.04|12.10|13.04|13.10)/
+            version = '2.2'
+          when /(14.04|14.10|15.04|15.10|16.04)/
+            version = '2.4'
+          else
+            version = unknown
+        end
+
+      else
+        version = unknown
+    end
+    version
+  end
+end
diff --git a/spec/functions/guess_apache_version.rb b/spec/functions/guess_apache_version.rb
new file mode 100644
index 0000000..b57a7a0
--- /dev/null
+++ b/spec/functions/guess_apache_version.rb
@@ -0,0 +1,50 @@
+require File.expand_path(File.join(File.dirname(__FILE__),'../spec_helper'))
+
+describe 'guess_apache_version function' do
+
+  #let(:scope) { PuppetlabsSpec::PuppetInternals.scope }
+
+  it "should exist" do
+    expect(Puppet::Parser::Functions.function("guess_apache_version")).to eq("function_guess_apache_version")
+  end
+
+  context 'on debian 7.8' do
+    let(:facts) do
+      {
+        :operatingsystem => 'Debian',
+        :operatingsystemrelease => '7.8'
+      }
+    end
+    it "should return 2.2" do
+      result = scope.function_guess_apache_version([])
+      expect(result).to(eq('2.2'))
+    end
+  end
+
+  context 'on debian 8.0' do
+    let(:facts) do
+      {
+        :operatingsystem => 'Debian',
+        :operatingsystemrelease => '8.0'
+      }
+    end
+    it "should return 2.4" do
+      result = scope.function_guess_apache_version([])
+      expect(result).to(eq('2.4'))
+    end
+  end
+
+  context 'on ubuntu 15.10' do
+    let(:facts) do
+      {
+        :operatingsystem => 'Ubuntu',
+        :operatingsystemrelease => '15.10'
+      }
+    end
+    it "should return 2.4" do
+      result = scope.function_guess_apache_version([])
+      expect(result).to(eq('2.4'))
+    end
+  end
+
+end