fix agent stall when also using web argument

lib/logstash/runner.rb

@@ -56,6 +56,10 @@ I18n.load_path << File.expand_path(
 class LogStash::Runner
   include LogStash::Program
 
+  def initialize
+    @runners = []
+  end
+
   def main(args)
     require "logstash/util"
     require "stud/trap"
@@ -74,7 +78,6 @@ class LogStash::Runner
 
     args = [nil] if args.empty?
 
-    @runners = []
     while args != nil && !args.empty?
       args = run(args)
     end
@@ -187,15 +190,16 @@ class LogStash::Runner
         agent = LogStash::Agent.new($0)
         begin
           agent.parse(args)
-          @runners << Stud::Task.new { agent.execute }
         rescue Clamp::HelpWanted => e
-          puts e.command.help
+          show_help(e.command)
+          return []
         rescue Clamp::UsageError => e
           # If 'too many arguments' then give the arguments to
           # the next command. Otherwise it's a real error.
           raise if e.message != "too many arguments"
           remaining = agent.remaining_arguments
         end
+        @runners << Stud::Task.new { agent.execute }
 
         return remaining
       end
@@ -229,8 +233,17 @@ class LogStash::Runner
     return args
   end # def run
 
+  def self.valid_caller?
+    caller.none?{|entry| entry =~ /rspec/}
+  end
+
+  private
+
+  def show_help(command)
+    puts command.help
+  end
 end # class LogStash::Runner
 
-if $0 == __FILE__
+if $0 == __FILE__ && LogStash::Runner.valid_caller?
   LogStash::Runner.new.main(ARGV)
 end

spec/runner_spec.rb

@@ -0,0 +1,42 @@
+require "logstash/runner"
+require "logstash/agent"
+require "logstash/kibana"
+require "stud/task"
+
+class NullRunner
+  def run(args); end
+end
+
+describe LogStash::Runner do
+
+  context "argument parsing" do
+    it "should run agent" do
+      expect(Stud::Task).to receive(:new).once.and_return(nil)
+      args = ["agent", "-e", ""]
+      expect(subject.run(args)).to eq(nil)
+    end
+
+    it "should run agent help" do
+      expect(subject).to receive(:show_help).once.and_return(nil)
+      args = ["agent", "-h"]
+      expect(subject.run(args)).to eq([])
+    end
+
+    it "should run agent help and not run following commands" do
+      expect(subject).to receive(:show_help).once.and_return(nil)
+      args = ["agent", "-h", "web"]
+      expect(subject.run(args)).to eq([])
+    end
+
+    it "should run agent and web" do
+      expect(Stud::Task).to receive(:new).once
+      args = ["agent", "-e", "", "web"]
+      args = subject.run(args)
+      expect(args).to eq(["web"])
+
+      expect(LogStash::Kibana::Runner).to receive(:new).once.and_return(NullRunner.new)
+      args = subject.run(args)
+      expect(args).to eq(nil)
+    end
+  end
+end