From 8cce9b8a8cf465c5de9b663e99598b0c4e70b900 Mon Sep 17 00:00:00 2001
From: Thomas Reynolds <me@tdreyno.com>
Date: Mon, 10 Aug 2015 10:00:23 -0700
Subject: [PATCH] Loudly announce external pipeline errors and exit with
 failure.

---
 .../lib/middleman-core/extensions/external_pipeline.rb         | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/middleman-core/lib/middleman-core/extensions/external_pipeline.rb b/middleman-core/lib/middleman-core/extensions/external_pipeline.rb
index 2e4e3669..6fc82aa0 100644
--- a/middleman-core/lib/middleman-core/extensions/external_pipeline.rb
+++ b/middleman-core/lib/middleman-core/extensions/external_pipeline.rb
@@ -33,5 +33,8 @@ class Middleman::Extensions::ExternalPipeline < ::Middleman::Extension
         logger.info "== External: #{without_newline}" if without_newline.length > 0
       end
     end
+  rescue ::Errno::ENOENT => e
+    logger.error "== External: Command failed with message: #{e.message}"
+    exit(1)
   end
 end