From 1741e45011f14b7f8638b079f8fb643f0352232e Mon Sep 17 00:00:00 2001
From: Patricia Jung <patricia.jung@swmh.de>
Date: Wed, 21 Dec 2016 10:16:05 +0100
Subject: [PATCH] pre_create_command

---
 README.md                    | 12 ++++++++++++
 lib/kitchen/driver/docker.rb | 11 +++++++++++
 2 files changed, 23 insertions(+)

diff --git a/README.md b/README.md
index 95f540cf..9c80e830 100644
--- a/README.md
+++ b/README.md
@@ -476,6 +476,18 @@ Examples:
     net: br3
 ```
 
+### pre_create_command
+
+A shell command which is run locally before creating the container.
+Used to prepare the build environment (e.g. to generate files
+to be copied in the build process or used in converge stage).
+
+Examples:
+
+```yaml
+  pre_create_command: ./my_shell_script.sh
+```
+
 ## Development
 
 * Source hosted at [GitHub][repo]
diff --git a/lib/kitchen/driver/docker.rb b/lib/kitchen/driver/docker.rb
index 58a30236..0d8300b0 100644
--- a/lib/kitchen/driver/docker.rb
+++ b/lib/kitchen/driver/docker.rb
@@ -116,6 +116,7 @@ def default_platform
       end
 
       def create(state)
+        pre_create_command
         generate_keys
         state[:username] = config[:username]
         state[:ssh_key] = config[:private_key]
@@ -286,6 +287,16 @@ def dockerfile
         end
       end
 
+      def pre_create_command
+        if config[:pre_create_command]
+          system(config[:pre_create_command])
+          if $?.exitstatus.nonzero?
+            raise ActionFailed,
+              "pre_create_command '#{config[:pre_create_command]}' failed to execute (exit status #{$?.exitstatus})"
+          end
+        end
+      end
+
       def parse_image_id(output)
         output.each_line do |line|
           if line =~ /image id|build successful|successfully built/i