Adding a fact to show you swap file sizes

lib/facter/swap_file_size.rb

@@ -0,0 +1,30 @@
+if File.exists?('/proc/swaps')
+  swap_file_hash = {}
+
+  swap_file_output = Facter::Util::Resolution.exec('cat /proc/swaps')
+
+    # Sample Output
+    # Filename                                Type    Size  Used  Priority
+    # /mnt/swap.1                             file    1019900 0 -1
+    # /tmp/swapfile.fallocate                 file    1019900 0 -2
+    swap_file_output_array = swap_file_output.split("\n")
+
+    # Remove the header line
+    swap_file_output_array.shift
+
+    swap_file_output_array.each do |line|
+
+      swap_file_line_array = line.gsub(/\s+/m, ' ').strip.split(" ")
+
+      swap_file_hash[swap_file_line_array[0]] = swap_file_line_array[2]
+
+    end
+
+    Facter.add('swap_file_sizes') do
+      confine :kernel => 'Linux'
+      setcode do
+        swap_file_hash
+      end
+    end
+
+end

spec/unit/facter/swapfiles_fact_spec.rb

@@ -0,0 +1,33 @@
+require "spec_helper"
+
+describe Facter::Util::Fact do
+  before {
+    Facter.clear
+  }
+
+  describe 'swap_files' do
+    context 'returns swap_files when present' do
+      before do
+        Facter.fact(:kernel).stubs(:value).returns("Linux")
+        File.stubs(:exists?)
+        File.expects(:exists?).with('/proc/swaps').returns(true)
+        Facter::Util::Resolution.stubs(:exec)
+      end
+      it do
+        proc_swap_output = <<-EOS
+Filename        Type    Size  Used  Priority
+/mnt/swap.1                             file    1019900 0 -1
+/tmp/swapfile.fallocate                 file    1019900 0 -2
+        EOS
+        Facter::Util::Resolution.expects(:exec).with('cat /proc/swaps').returns(proc_swap_output)
+        expect(Facter.value(:swap_file_sizes)).to eq(
+          {
+            "/mnt/swap.1"=>"1019900",
+            "/tmp/swapfile.fallocate"=>"1019900"
+          }
+        )
+      end
+    end
+
+  end
+end