Box#bash takes an :env option with a hash of environment variables

lib/rush/box.rb

@@ -49,13 +49,27 @@ def processes
 		end
 	end
 
-	# Execute a command in the standard unix shell.  Optional parameter :user
-	# switches to that user via sudo first, if you have permission.  Example:
+	# Execute a command in the standard unix shell.  Options:
+	#
+	# :user => unix username to become via sudo
+	# :env => hash of environment variables
+	#
+	# Example:
 	#
 	#   box.bash '/etc/init.d/mysql restart', :user => 'root'
+	#   box.bash 'rake db:migrate', :user => 'www', :env => { :RAILS_ENV => 'production' }
 	#
 	def bash(command, options={})
-		connection.bash(command, options[:user])
+		connection.bash(command_with_environment(command, options[:env]), options[:user])
+	end
+
+	def command_with_environment(command, env)   # :nodoc:
+		return command unless env
+
+		vars = env.map do |key, value|
+			"export #{key}='#{value}'"
+		end
+		vars.push(command).join("\n")
 	end
 
 	# Returns true if the box is responding to commands.

spec/box_spec.rb

@@ -31,6 +31,16 @@
 		@box.bash('cmd', :user => 'user')
 	end
 
+	it "builds a script of environment variables to prefix the bash command" do
+		@box.command_with_environment('cmd', { :a => 'b' }).should == "export a='b'\ncmd"
+	end
+
+	it "sets the environment variables from the provided hash" do
+		@box.connection.stub!(:bash)
+		@box.should_receive(:command_with_environment).with('cmd', { 1 => 2 })
+		@box.bash('cmd', :env => { 1 => 2 })
+	end
+
 	it "checks the connection to determine if it is alive" do
 		@box.connection.should_receive(:alive?).and_return(true)
 		@box.should be_alive