Add proxysql_version fact

lib/facter/proxysql_version.rb

@@ -0,0 +1,9 @@
+Facter.add(:proxysql_version) do
+  confine kernel: 'Linux'
+  setcode do
+    if Facter::Util::Resolution.which('proxysql')
+      proxysql_version = Facter::Util::Resolution.exec('proxysql --version 2>&1')
+      %r{ProxySQL version (\d+\.\d+\.\d+.*),}.match(proxysql_version)[1]
+    end
+  end
+end

spec/unit/facter/proxysql_version_spec.rb

@@ -0,0 +1,17 @@
+require 'spec_helper'
+
+describe Facter::Util::Fact.to_s do
+  before do
+    Facter.clear
+  end
+
+  describe 'proxysql_version' do
+    before do
+      allow(Facter::Util::Resolution).to receive(:which).with('proxysql').and_return(true)
+      allow(Facter::Util::Resolution).to receive(:exec).with('proxysql --version 2>&1').and_return('ProxySQL version 2.0.4-116-g7d371cf2, codename Truls')
+    end
+    it {
+      expect(Facter.fact(:proxysql_version).value).to eq('2.0.4-116-g7d371cf2')
+    }
+  end
+end