lib/percheron/container/actions/build.rb in percheron-0.3.2 vs lib/percheron/container/actions/build.rb in percheron-0.4.0

@@ -1,5 +1,7 @@
+require 'open3'
+
 module Percheron
   module Container
     module Actions
       class Build
 
@@ -7,14 +9,16 @@
           @container = container
           @nocache = nocache
         end
 
         def execute!
-          base_dir = container.dockerfile.dirname.to_s
-          $logger.debug "Building '#{container.image}'"
-          Docker::Image.build_from_dir(base_dir, build_opts) do |out|
-            $logger.debug '%s' % [ out.strip ]
+          in_working_directory(base_dir) do
+            execute_pre_build_scripts!
+            $logger.debug "Building '#{container.image}'"
+            Docker::Image.build_from_dir(base_dir, build_opts) do |out|
+              $logger.debug '%s' % [ out.strip ]
+            end
           end
         end
 
         private
 
@@ -25,9 +29,34 @@
               'dockerfile'  => container.dockerfile.basename.to_s,
               't'           => container.image,
               'forcerm'     => true,
               'nocache'     => nocache
             }
+          end
+
+          def base_dir
+            container.dockerfile.dirname.to_s
+          end
+
+          def in_working_directory(new_dir)
+            old_dir = Dir.pwd
+            Dir.chdir(new_dir)
+            yield
+            Dir.chdir(old_dir)
+          end
+
+          def execute_pre_build_scripts!
+            container.pre_build_scripts.each do |script|
+              in_working_directory(base_dir) do
+                command = '/bin/bash -x %s 2>&1' % Pathname.new(File.expand_path(script))
+                $logger.debug "Executing '#{command}' for '#{container.name}' container"
+                Open3.popen2e(command) do |stdin, stdout_err, wait_thr|
+                  while line = stdout_err.gets
+                    $logger.debug line.strip
+                  end
+                end
+              end
+            end
           end
 
       end
     end
   end