Enable dry run mode when PRODUCER_DRYRUN is set

features/cli/dry_run.feature

@@ -15,3 +15,8 @@ Feature: CLI dry run option
   Scenario: prints a warning before any output
     When I successfully execute the recipe with option -n
     Then the output must match /\AWarning: running in dry run mode, actions will NOT be applied/
+
+  Scenario: enables dry run mode from the environment
+    Given I set the environment variable "PRODUCER_DRYRUN"
+    When I successfully execute the recipe
+    Then the output must contain "running in dry run"

lib/producer/core/cli.rb

@@ -12,6 +12,7 @@ module Producer
 
       ENV_VERBOSE_KEY = 'PRODUCER_VERBOSE'.freeze
       ENV_DEBUG_KEY   = 'PRODUCER_DEBUG'.freeze
+      ENV_DRYRUN_KEY  = 'PRODUCER_DRYRUN'.freeze
 
       class << self
         def run!(arguments, stdin: $stdin, stdout: $stdout, stderr: $stderr)
@@ -75,6 +76,7 @@ module Producer
       def configure_environment!(environment)
         @env.verbose  = true if environment.key? ENV_VERBOSE_KEY
         @env.debug    = true if environment.key? ENV_DEBUG_KEY
+        @env.dry_run  = true if environment.key? ENV_DRYRUN_KEY
       end
 
       def split_arguments_lists(arguments)

spec/producer/core/cli_spec.rb

@@ -92,6 +92,14 @@ module Producer::Core
           expect(cli.env).to be_debug
         end
       end
+
+      context 'when PRODUCER_DRYRUN environment variable is set' do
+        before { environment['PRODUCER_DRYRUN'] = 'yes' }
+
+        it 'enables env dry run mode' do
+          expect(cli.env).to be_dry_run
+        end
+      end
     end
 
     describe '#parse_arguments!' do