Fix bug to ignore some command line options

example/suppress_config_dump.conf

@@ -0,0 +1,7 @@
+<system>
+  suppress_config_dump false
+</system>
+
+<match data.*>
+  @type stdout
+</match>

lib/fluent/supervisor.rb

@@ -374,7 +374,7 @@ def self.default_options
         root_dir: nil,
         suppress_interval: 0,
         suppress_repeated_stacktrace: true,
-        without_source: false,
+        without_source: nil,
         use_v1_config: true,
         supervise: true,
         standalone_worker: false,
@@ -695,6 +695,7 @@ def read_config
 
     def set_system_config
       @system_config = SystemConfig.create(@conf) # @conf is set in read_config
+      @system_config.attach(self)
       @system_config.apply(self)
     end
 

lib/fluent/system_config.rb

@@ -82,6 +82,26 @@ def dup
       s
     end
 
+    def attach(supervisor)
+      system = self
+      supervisor.instance_eval {
+        SYSTEM_CONFIG_PARAMETERS.each do |param|
+          case param
+          when :rpc_endpoint, :enable_get_dump, :process_name, :file_permission, :dir_permission
+            next # doesn't exist in command line options
+          when :emit_error_log_interval
+            system.emit_error_log_interval = @suppress_interval if @suppress_interval
+          else
+            next unless instance_variable_defined?("@#{param}")
+            supervisor_value = instance_variable_get("@#{param}")
+            next if supervisor_value.nil? # it's not configured by command line options
+
+            system.send("#{param}=", supervisor_value)
+          end
+        end
+      }
+    end
+
     def apply(supervisor)
       system = self
       supervisor.instance_eval {

test/command/test_fluentd.rb

@@ -81,7 +81,7 @@ def execute_command(cmdline, chdir=TMP_DIR)
     null_stream.close rescue nil
   end
 
-  def assert_log_matches(cmdline, *pattern_list, timeout: 10)
+  def assert_log_matches(cmdline, *pattern_list, patterns_not_match: [], timeout: 10)
     matched = false
     assert_error_msg = "matched correctly"
     stdio_buf = ""
@@ -118,6 +118,18 @@ def assert_log_matches(cmdline, *pattern_list, timeout: 10)
       assert_error_msg = "unexpected error in launching fluentd: #{e.inspect}\n" + stdio_buf
     end
     assert matched, assert_error_msg
+
+    unless patterns_not_match.empty?
+      lines = stdio_buf.split("\n")
+      patterns_not_match.each do |ptn|
+        matched_wrongly = if ptn.is_a? Regexp
+                            lines.any?{|line| ptn.match(line) }
+                          else
+                            lines.any?{|line| line.include?(ptn) }
+                          end
+        assert_false matched_wrongly, "pattern exists in logs wrongly:\n" + stdio_buf
+      end
+    end
   end
 
   def assert_fluentd_fails_to_start(cmdline, *pattern_list, timeout: 10)
@@ -244,6 +256,51 @@ def assert_fluentd_fails_to_start(cmdline, *pattern_list, timeout: 10)
     end
   end
 
+  sub_test_case 'configured to suppress configration dump' do
+    setup do
+      @basic_conf = <<CONF
+<source>
+  @type dummy
+  @id dummy
+  @label @dummydata
+  tag dummy
+  dummy {"message": "yay!"}
+</source>
+<label @dummydata>
+  <match dummy>
+    @type null
+    @id   blackhole
+  </match>
+</label>
+CONF
+    end
+
+    test 'configured by system config' do
+      conf = <<SYSTEM + @basic_conf
+<system>
+  suppress_config_dump
+</system>
+SYSTEM
+      conf_path = create_conf_file('suppress_conf_dump_1.conf', conf)
+      assert_log_matches(create_cmdline(conf_path), "fluentd worker is now running", patterns_not_match: ["tag dummy"])
+    end
+
+    test 'configured by command line option' do
+      conf_path = create_conf_file('suppress_conf_dump_2.conf', @basic_conf)
+      assert_log_matches(create_cmdline(conf_path, '--suppress-config-dump'), "fluentd worker is now running", patterns_not_match: ["tag dummy"])
+    end
+
+    test 'configured as false by system config, but overridden as true by command line option' do
+      conf = <<SYSTEM + @basic_conf
+<system>
+  suppress_config_dump false
+</system>
+SYSTEM
+      conf_path = create_conf_file('suppress_conf_dump_3.conf', conf)
+      assert_log_matches(create_cmdline(conf_path, '--suppress-config-dump'), "fluentd worker is now running", patterns_not_match: ["tag dummy"])
+    end
+  end
+
   sub_test_case 'configuration with wrong plugin type' do
     test 'failed to start' do
       conf = <<CONF