ensure git pushed function - code props to @fgarcia

data/deploy.rb

@@ -42,6 +42,7 @@
 
 desc "Deploys the current version to the server."
 task deploy: :environment do
+  ensure_git_pushed!
   deploy do
     # Put things that will set up an empty directory into a fully set-up
     # instance of your project.

docs/writing_your_own_tasks.md

@@ -115,3 +115,10 @@ Raises an error if variable is not set
 ``` ruby
 ensure!(:deploy_to)
 ```
+
+### ensure_git_pushed!
+Aborts the build if the local branch has not been pushed to the remote branch.
+
+``` ruby
+ensure_git_pushed!(branch: :master, remote: :origin, message: "Your master branch needs to be pushed to origin before deploying")
+```

lib/mina/dsl.rb

@@ -15,6 +15,15 @@ def invoke(task, *args)
       Rake::Task[task].reenable
     end
 
+    def ensure_git_pushed!(opts = {})
+      branch = opts[:branch] || fetch(:branch)
+      remote = opts[:remote] || fetch(:remote)
+      message = opts[:message].to_s ||
+        "Your branch #{branch} needs to be pushed to #{remote} before deploying"
+      pending = system "[ $(git log #{remote}/#{branch}..#{branch} | wc -l) -ne 0 ]"
+      fail message if pending
+    end
+
     def commands
       @commands ||= Commands.new
     end