Pre-release checks test.

Rakefile

@@ -1,5 +1,6 @@
 require 'logstash/devutils/rake'
 require 'jars/installer'
+require 'rubygems'
 
 desc 'Fetch any jars required for this plugin'
 task :install_jars do
@@ -7,3 +8,22 @@ task :install_jars do
   ENV['JARS_VENDOR'] = 'false'
   Jars::Installer.new.vendor_jars!(false)
 end
+
+desc 'Pre-release checks'
+task :pre_release_checks do
+
+  if `git status --porcelain`.chomp.length > 0
+    raise "You have unstaged or uncommitted changes! Please only deploy from a clean working directory!"
+  end
+
+  spec = Gem::Specification::load("logstash-output-jdbc.gemspec")
+  expected_tag_name = "v#{spec.version}"
+
+  current_tag_name = `git describe --exact-match --tags HEAD`.chomp
+  if $? == 0
+    raise "Expected git tag to be '#{expected_tag_name}', but got '#{current_tag_name}'." if current_tag_name != expected_tag_name
+  else
+    raise "Expected git tag to be '#{expected_tag_name}, but got nothing."
+  end
+  
+end

Vagrantfile

@@ -6,6 +6,7 @@ Vagrant.configure(2) do |config|
   config.vm.synced_folder '.', '/vagrant', type: :virtualbox
 
   config.vm.provision 'shell', inline: <<-EOP
+    apt-get install git -y -q
     gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
     curl -sSL https://get.rvm.io | bash -s stable --ruby=jruby-1.7
     usermod -a -G rvm vagrant