PR/MR: Output PR/MR intent only when relevent in noop

This commit removes the outputs like "Would submit PR" when there are no
changes after update (in no-op mode).

features/update/pull_request.feature

@@ -8,18 +8,26 @@ Feature: Create a pull-request/merge-request after update
       puppet-test:
         github: {}
       """
-    And a directory named "moduleroot"
     And I set the environment variables to:
       | variable     | value  |
       | GITHUB_TOKEN | foobar |
+    And a file named "config_defaults.yml" with:
+      """
+      ---
+      test:
+        name: aruba
+      """
+    And a file named "moduleroot/test.erb" with:
+      """
+      <%= @configs['name'] %>
+      """
     When I run `msync update --noop --branch managed_update --pr`
     Then the output should contain "Would submit PR "
     And the exit status should be 0
     And the puppet module "puppet-test" from "fakenamespace" should have no commits made by "Aruba"
 
   Scenario: Run update in no-op mode and ask for GitLab MR
     Given a basic setup with a puppet module "puppet-test" from "fakenamespace"
-    And a directory named "moduleroot"
     And a file named "managed_modules.yml" with:
       """
       ---
@@ -29,11 +37,38 @@ Feature: Create a pull-request/merge-request after update
     And I set the environment variables to:
       | variable     | value  |
       | GITLAB_TOKEN | foobar |
+    And a file named "config_defaults.yml" with:
+      """
+      ---
+      test:
+        name: aruba
+      """
+    And a file named "moduleroot/test.erb" with:
+      """
+      <%= @configs['name'] %>
+      """
     When I run `msync update --noop --branch managed_update --pr`
     Then the output should contain "Would submit MR "
     And the exit status should be 0
     And the puppet module "puppet-test" from "fakenamespace" should have no commits made by "Aruba"
 
+  Scenario: Run update without changes in no-op mode and ask for GitLab MR
+    Given a basic setup with a puppet module "puppet-test" from "fakenamespace"
+    And a directory named "moduleroot"
+    And a file named "managed_modules.yml" with:
+      """
+      ---
+      puppet-test:
+        gitlab: {}
+      """
+    And I set the environment variables to:
+      | variable     | value  |
+      | GITLAB_TOKEN | foobar |
+    When I run `msync update --noop --branch managed_update --pr`
+    Then the output should not contain "Would submit MR "
+    And the exit status should be 0
+    And the puppet module "puppet-test" from "fakenamespace" should have no commits made by "Aruba"
+
   Scenario: Ask for PR without credentials
     Given a basic setup with a puppet module "puppet-test" from "fakenamespace"
     And a file named "managed_modules.yml" with:
@@ -42,7 +77,16 @@ Feature: Create a pull-request/merge-request after update
       puppet-test:
         gitlab: {}
       """
-    And a directory named "moduleroot"
+    And a file named "config_defaults.yml" with:
+      """
+      ---
+      test:
+        name: aruba
+      """
+    And a file named "moduleroot/test.erb" with:
+      """
+      <%= @configs['name'] %>
+      """
     When I run `msync update --noop --pr`
     Then the stderr should contain "No GitLab token specified to create a merge request"
     And the exit status should be 1
@@ -61,7 +105,16 @@ Feature: Create a pull-request/merge-request after update
         gitlab:
           token: 'secret'
       """
-    And a directory named "moduleroot"
+    And a file named "config_defaults.yml" with:
+      """
+      ---
+      test:
+        name: aruba
+      """
+    And a file named "moduleroot/test.erb" with:
+      """
+      <%= @configs['name'] %>
+      """
     When I run `msync update --noop --branch managed_update --pr`
     Then the exit status should be 0
     And the output should contain "Would submit PR "
@@ -78,7 +131,16 @@ Feature: Create a pull-request/merge-request after update
         gitlab:
           token: 'secret'
       """
-    And a directory named "moduleroot"
+    And a file named "config_defaults.yml" with:
+      """
+      ---
+      test:
+        name: aruba
+      """
+    And a file named "moduleroot/test.erb" with:
+      """
+      <%= @configs['name'] %>
+      """
     When I run `msync update --noop --branch managed_update --pr --pr-target-branch managed_update`
     Then the stderr should contain "Unable to open a pull request with the same source and target branch: 'managed_update'"
     And the exit status should be 1
@@ -94,6 +156,16 @@ Feature: Create a pull-request/merge-request after update
         github:
           token: 'secret'
       """
+    And a file named "config_defaults.yml" with:
+      """
+      ---
+      test:
+        name: aruba
+      """
+    And a file named "moduleroot/test.erb" with:
+      """
+      <%= @configs['name'] %>
+      """
     And a directory named "moduleroot"
     When I run `msync update --noop --pr`
     Then the stderr should contain "Unable to open a pull request with the same source and target branch: 'custom_default_branch'"

lib/modulesync.rb

@@ -129,8 +129,8 @@ def self.manage_module(puppet_module, module_files, defaults)
 
     if options[:noop]
       puts "Using no-op. Files in '#{puppet_module.given_name}' may be changed but will not be committed."
-      puppet_module.repository.show_changes(options)
-      options[:pr] && puppet_module.open_pull_request
+      changed = puppet_module.repository.show_changes(options)
+      changed && options[:pr] && puppet_module.open_pull_request
     elsif !options[:offline]
       pushed = puppet_module.repository.submit_changes(files_to_manage, options)
       # Only bump/tag if pushing didn't fail (i.e. there were changes)

lib/modulesync/repository.rb

@@ -153,6 +153,8 @@ def show_changes(options)
 
       puts "\n\n"
       puts '--------------------------------'
+
+      git.diff('HEAD', '--').any? || untracked_unignored_files.any?
     end
   end
 end