Add a new option unbundle to ShellCommandAgent

This addresses #1989.

app/models/agents/shell_command_agent.rb

@@ -22,6 +22,8 @@ module Agents
 
       The resulting event will contain the `command` which was executed, the `path` it was executed under, the `exit_status` of the command, the `errors`, and the actual `output`. ShellCommandAgent will not log an error if the result implies that something went wrong.
 
+      If `unbundle` is set to true, the command is run in a clean environment, outside of Huginn's bundler context.
+
       If `suppress_on_failure` is set to true, no event is emitted when `exit_status` is not zero.
 
       If `suppress_on_empty_output` is set to true, no event is emitted when `output` is empty.
@@ -47,6 +49,7 @@ module Agents
       {
           'path' => "/",
           'command' => "pwd",
+          'unbundle' => false,
           'suppress_on_failure' => false,
           'suppress_on_empty_output' => false,
           'expected_update_period_in_days' => 1
@@ -95,7 +98,7 @@ module Agents
         path = opts['path']
         stdin = opts['stdin']
 
-        result, errors, exit_status = run_command(path, command, stdin)
+        result, errors, exit_status = run_command(path, command, stdin, interpolated.slice(:unbundle).symbolize_keys)
 
         payload = {
           'command' => command,
@@ -115,7 +118,13 @@ module Agents
       end
     end
 
-    def run_command(path, command, stdin)
+    def run_command(path, command, stdin, unbundle: false)
+      if unbundle
+        return Bundler.with_original_env {
+          run_command(path, command, stdin)
+        }
+      end
+
       begin
         rout, wout = IO.pipe
         rerr, werr = IO.pipe

spec/models/agents/shell_command_agent_spec.rb

@@ -60,7 +60,7 @@ describe Agents::ShellCommandAgent do
 
   describe "#working?" do
     it "generating events as scheduled" do
-      stub(@checker).run_command(@valid_path, 'pwd', nil) { ["fake pwd output", "", 0] }
+      stub(@checker).run_command(@valid_path, 'pwd', nil, {}) { ["fake pwd output", "", 0] }
 
       expect(@checker).not_to be_working
       @checker.check
@@ -73,9 +73,14 @@ describe Agents::ShellCommandAgent do
 
   describe "#check" do
     before do
-      stub(@checker).run_command(@valid_path, 'pwd', nil) { ["fake pwd output", "", 0] }
-      stub(@checker).run_command(@valid_path, 'empty_output', nil) { ["", "", 0] }
-      stub(@checker).run_command(@valid_path, 'failure', nil) { ["failed", "error message", 1] }
+      orig_run_command = @checker.method(:run_command)
+      stub(@checker).run_command(@valid_path, 'pwd', nil, {}) { ["fake pwd output", "", 0] }
+      stub(@checker).run_command(@valid_path, 'empty_output', nil, {}) { ["", "", 0] }
+      stub(@checker).run_command(@valid_path, 'failure', nil, {}) { ["failed", "error message", 1] }
+      stub(@checker).run_command(@valid_path, 'echo $BUNDLE_GEMFILE', nil, unbundle: true) { orig_run_command.(@valid_path, 'echo $BUNDLE_GEMFILE', nil, unbundle: true) }
+      [[], [{}], [{ unbundle: false }]].each do |rest|
+        stub(@checker).run_command(@valid_path, 'echo $BUNDLE_GEMFILE', nil, *rest) { [ENV['BUNDLE_GEMFILE'].to_s, "", 0] }
+      end
     end
 
     it "should create an event when checking" do
@@ -125,11 +130,46 @@ describe Agents::ShellCommandAgent do
       stub(Agents::ShellCommandAgent).should_run? { false }
       expect { @checker.check }.not_to change { Event.count }
     end
+
+    describe "with unbundle" do
+      before do
+        @checker.options[:command] = 'echo $BUNDLE_GEMFILE'
+      end
+
+      context "unspecified" do
+        it "should be run inside of our bundler context" do
+          expect { @checker.check }.to change { Event.count }.by(1)
+          expect(Event.last.payload[:output].strip).to eq(ENV['BUNDLE_GEMFILE'])
+        end
+      end
+
+      context "explicitly set to false" do
+        before do
+          @checker.options[:unbundle] = false
+        end
+
+        it "should be run inside of our bundler context" do
+          expect { @checker.check }.to change { Event.count }.by(1)
+          expect(Event.last.payload[:output].strip).to eq(ENV['BUNDLE_GEMFILE'])
+        end
+      end
+
+      context "set to true" do
+        before do
+          @checker.options[:unbundle] = true
+        end
+
+        it "should be run outside of our bundler context" do
+          expect { @checker.check }.to change { Event.count }.by(1)
+          expect(Event.last.payload[:output].strip).to eq('') # not_to eq(ENV['BUNDLE_GEMFILE']
+        end
+      end
+    end
   end
 
   describe "#receive" do
     before do
-      stub(@checker).run_command(@valid_path, @event.payload[:cmd], nil) { ["fake ls output", "", 0] }
+      stub(@checker).run_command(@valid_path, @event.payload[:cmd], nil, {}) { ["fake ls output", "", 0] }
     end
 
     it "creates events" do