disable_publish_for_branches: new configuration option

OBS currently disables publishing for any new branch in order to avoid
using disk space and bandwidth to carry out publishing. For small private
installations, it can make sense to avoid that, and inherit the publish
flags from the parent project instead.

Bug: #596

docs/api/api/configuration.rng

@@ -133,6 +133,15 @@
             </choice>
           </element>
         </optional>
+        <optional>
+          <element name="disable_publish_for_branches">
+            <!-- When a user creates a new project as a side-effect of branching a package, disable publishing that project? The default is "on" to save disk space and bandwidth. -->
+            <choice>
+              <value>on</value>
+              <value>off</value>
+            </choice>
+          </element>
+        </optional>
 
         <!-- webui only stuff -->
         <optional>

src/api/app/models/configuration.rb

@@ -27,8 +27,9 @@ class Configuration < ActiveRecord::Base
                    :cleanup_after_days => nil,
                    :theme => CONFIG['theme'],
                    :cleanup_empty_projects => nil,
+                   :disable_publish_for_branches => nil,
                  }
-  ON_OFF_OPTIONS = [ :anonymous, :default_access_disabled, :allow_user_to_create_home_project, :disallow_group_creation, :change_password, :hide_private_options, :gravatar, :download_on_demand, :enforce_project_keys, :cleanup_empty_projects ]
+  ON_OFF_OPTIONS = [ :anonymous, :default_access_disabled, :allow_user_to_create_home_project, :disallow_group_creation, :change_password, :hide_private_options, :gravatar, :download_on_demand, :enforce_project_keys, :cleanup_empty_projects, :disable_publish_for_branches ]
 
   class << self
     def map_value(key, value)

src/api/app/models/project.rb

@@ -1070,13 +1070,21 @@ def branch_to_repositories_from(project, pkg_to_enable, extend_names=nil)
       end
       pkg_to_enable.enable_for_repository(repoName) if pkg_to_enable
     end
-    # take over flags, but explicit disable publishing by default and enable building. Ommiting also lock or we can not create packages
+    # Take over flags, but enable building.
+    # By default, disable 'publish' to save space and bandwidth, but this
+    # can be turned off for small installations.
+    # Also omit 'lock' or we cannot create packages.
+    disable_publish_for_branches = ::Configuration.first.disable_publish_for_branches
     project.flags.each do |f|
-      unless %w(build publish lock).include?(f.flag)
-        self.flags.create(status: f.status, flag: f.flag, architecture: f.architecture, repo: f.repo)
-      end
+      next if %w(build lock).include?(f.flag)
+      next if f.flag == 'publish' and disable_publish_for_branches
+
+      self.flags.create(status: f.status, flag: f.flag, architecture: f.architecture, repo: f.repo)
+    end
+
+    if disable_publish_for_branches
+      self.flags.create(:status => 'disable', :flag => 'publish') unless self.flags.find_by_flag_and_status( 'publish', 'disable' )
     end
-    self.flags.create(:status => 'disable', :flag => 'publish') unless self.flags.find_by_flag_and_status( 'publish', 'disable' )
   end
 
   def open_requests_with_project_as_source_or_target

src/api/db/migrate/20140219185200_disable_publish_for_branches.rb

@@ -0,0 +1,9 @@
+class DisablePublishForBranches < ActiveRecord::Migration
+  def self.up
+    add_column :configurations, :disable_publish_for_branches, :boolean, :default => true
+  end
+
+  def self.down
+    remove_column :configurations, :disable_publish_for_branches
+  end
+end

src/api/db/structure.sql

@@ -345,6 +345,7 @@ CREATE TABLE `configurations` (
   `obs_url` varchar(255) COLLATE utf8_bin DEFAULT NULL,
   `cleanup_after_days` int(11) DEFAULT NULL,
   `cleanup_empty_projects` tinyint(1) DEFAULT '1',
+  `disable_publish_for_branches` tinyint(1) DEFAULT '1',
   PRIMARY KEY (`id`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
 
@@ -1445,6 +1446,8 @@ INSERT INTO schema_migrations (version) VALUES ('20140210114542');
 
 INSERT INTO schema_migrations (version) VALUES ('20140218174400');
 
+INSERT INTO schema_migrations (version) VALUES ('20140219185200');
+
 INSERT INTO schema_migrations (version) VALUES ('21');
 
 INSERT INTO schema_migrations (version) VALUES ('22');

src/backend/BSXML.pm

@@ -1472,6 +1472,7 @@ our $configuration = [
 	'no_proxy',
 	'theme',
 	'cleanup_empty_projects',
+	'disable_publish_for_branches',
       [ 'schedulers' =>
 	  [ 'arch' ],
       ],