Merge pull request #360 from kjwierenga/feature/require-posix-spawn

Feature/require posix spawn

lib/foreman/cli.rb

@@ -34,6 +34,7 @@ class Foreman::CLI < Thor
   end
 
   def start(process=nil)
+    require_posix_spawn_for_ruby_18!
     check_procfile!
     load_environment!
     engine.load_procfile(procfile)
@@ -137,6 +138,14 @@ private ######################################################################
     end
   end
 
+  def require_posix_spawn_for_ruby_18!
+    begin
+      Kernel.require 'posix/spawn' # Use Kernel explicitly so we can mock the require call in the spec
+    rescue LoadError
+      error "foreman requires gem `posix-spawn` on Ruby #{RUBY_VERSION}. Please `gem install posix-spawn`."
+    end if Foreman.ruby_18?
+  end
+
   def procfile
     case
       when options[:procfile] then options[:procfile]