use Process.setproctitle to avoid bundler bug

CHANGELOG

@@ -1,7 +1,7 @@
 Release 6.0.25 (Not yet released)
 -------------
  * [Standalone] Changes Passenger (not app) start and stop timeouts to 25s (from 15s) except for Nginx engine mode, which retains a stop timeout of 60s.
- * 
+ * [Ruby] Fixes an issue where Bundler would try to re-exec the process name instead of the script. Closes GH-2567 and GH-2577.
 
 
 Release 6.0.24

src/helper-scripts/meteor-loader.rb

@@ -183,8 +183,13 @@ def self.load_app
         end
         exec("meteor run -p #{port} #{production} --settings settings.json")
       end
-      $0 = options["process_title"] if options["process_title"]
-      $0 = "#{$0} (#{pid})"
+
+      if options["process_title"] && !options["process_title"].empty?
+        rename_process "#{options["process_title"]} (#{pid})"
+      else
+        rename_process "#{$0} (#{pid})"
+      end
+
       return [pid, port]
     end
 

src/ruby_supportlib/phusion_passenger/loader_shared_helpers.rb

@@ -304,9 +304,9 @@ def before_handling_requests(forked, options)
       end
 
       if options["process_title"] && !options["process_title"].empty?
-        $0 = options["process_title"] + ": " + options["app_group_name"]
+        rename_process "#{options["process_title"]}: #{options["app_group_name"]}"
       else
-        $0 = "Passenger App: " + options["app_group_name"]
+        rename_process "Passenger App: #{options["app_group_name"]}"
       end
 
       # If we were forked from a preloader process then clear or
@@ -541,6 +541,14 @@ def dump_envvars
       try_write_file("#{dir}/envvars", ENV.to_a.map { |k, v| "#{k} = #{v}" }.join("\n"))
     end
 
+    def rename_process(name)
+      if Process.respond_to?(:setproctitle)
+        Process.setproctitle(name)
+      else
+        $0 = name
+      end
+    end
+
   private
     def running_bundler(options)
       yield

src/ruby_supportlib/phusion_passenger/preloader_shared_helpers.rb

@@ -37,7 +37,7 @@ module PreloaderSharedHelpers
     def init(main_app)
       options = LoaderSharedHelpers.init(main_app)
 
-      $0 = "#{SHORT_PROGRAM_NAME} AppPreloader: #{options['app_root']}"
+      LoaderSharedHelpers.rename_process pre_name(options)
 
       if !Kernel.respond_to?(:fork)
         message = "Smart spawning is not available on this Ruby " +
@@ -56,7 +56,7 @@ def init(main_app)
       options
     end
 
-    def accept_and_process_next_client(server_socket)
+    def accept_and_process_next_client(server_socket, options)
       client = server_socket.accept
       client.binmode
       begin
@@ -75,7 +75,7 @@ def accept_and_process_next_client(server_socket)
       end
 
       if doc['command'] == 'spawn'
-        handle_spawn_command(client, doc)
+        handle_spawn_command(client, doc, options)
       else
         client.write(Utils::JSON.generate(
           :result => 'error',
@@ -94,7 +94,7 @@ def accept_and_process_next_client(server_socket)
       end
     end
 
-    def handle_spawn_command(client, doc)
+    def handle_spawn_command(client, doc, options)
       work_dir = doc['work_dir']
       LoaderSharedHelpers.record_journey_step_end('PRELOADER_PREPARATION',
         'STEP_PERFORMED', work_dir)
@@ -114,7 +114,7 @@ def handle_spawn_command(client, doc)
 
       if pid.nil?
         begin
-          $0 = "#{$0} (forking...)"
+          LoaderSharedHelpers.rename_process "#{pre_name(options)} (forking...)"
           LoaderSharedHelpers.record_journey_step_end('PRELOADER_FORK_SUBPROCESS',
             'STEP_PERFORMED', work_dir)
           LoaderSharedHelpers.run_block_and_record_step_progress('PRELOADER_SEND_RESPONSE', work_dir) do
@@ -164,7 +164,7 @@ def run_main_loop(server, options)
         # https://code.google.com/p/phusion-passenger/issues/detail?id=915
         ios = Kernel.select([server_socket, STDIN])[0]
         if ios.include?(server_socket)
-          result, subprocess_work_dir = accept_and_process_next_client(server_socket)
+          result, subprocess_work_dir = accept_and_process_next_client(server_socket, options)
           if result == :forked
             return subprocess_work_dir
           end
@@ -188,6 +188,12 @@ def run_main_loop(server, options)
         File.unlink(socket_filename) rescue nil
       end
     end
+
+    private
+    def pre_name(options)
+      "#{SHORT_PROGRAM_NAME} AppPreloader: #{options['app_root']}"
+    end
+
   end
 
 end # module PhusionPassenger