Added support for customizable tag commit messages

lib/capistrano/deploy_tags.rb

@@ -43,6 +43,15 @@ module Capistrano
       exists?(:git_remote) ? git_remote : `git remote`.strip.split(/\n/).first
     end
 
+    def commit_message(current_sha)
+      if exists?(:deploytag_commit_message)
+        deploytag_commit_message
+      else
+        tag_user = (ENV['USER'] || ENV['USERNAME'] || 'deployer').strip
+        "#{tag_user} deployed #{current_sha} to #{stage}"
+      end
+    end
+
     def self.load_into(configuration)
       configuration.load do
         before 'deploy', 'git:prepare_tree'
@@ -78,8 +87,7 @@ module Capistrano
             current_sha = `git rev-parse #{branch} HEAD`.strip[0..8]
             logger.log Capistrano::Logger::INFO, "Tagging #{current_sha} for deployment"
 
-            tag_user = (ENV['USER'] || ENV['USERNAME']).strip
-            cdt.safe_run 'git', 'tag', '-a', cdt.git_tag_for(stage), '-m', "#{tag_user} deployed #{current_sha} to #{stage}"
+            cdt.safe_run 'git', 'tag', '-a', cdt.git_tag_for(stage), '-m', cdt.commit_message(current_sha)
             cdt.safe_run 'git', 'push', '--tags' if cdt.has_remote?
           end
         end