Allow git pull/push on project redirects

3 files changed, 60 insertions, 5 deletions

diff --git a/app/models/namespace.rb b/app/models/namespace.rb
index 901dbf2ba69..0ff169d4531 100644
--- a/app/models/namespace.rb
+++ b/app/models/namespace.rb
@@ -40,6 +40,7 @@ class Namespace < ActiveRecord::Base
     namespace_path: true
 
   validate :nesting_level_allowed
+  validate :allowed_path_by_redirects
 
   delegate :name, to: :owner, allow_nil: true, prefix: true
 
@@ -257,4 +258,14 @@ class Namespace < ActiveRecord::Base
     Namespace.where(id: descendants.select(:id))
       .update_all(share_with_group_lock: true)
   end
+
+  def allowed_path_by_redirects
+    return if path.nil?
+
+    errors.add(:path, "#{path} has been taken before. Please use another one") if namespace_previously_created_with_same_path?
+  end
+
+  def namespace_previously_created_with_same_path?
+    RedirectRoute.permanent.exists?(path: path)
+  end
 end
diff --git a/app/models/redirect_route.rb b/app/models/redirect_route.rb
index 31de204d824..20532527346 100644
--- a/app/models/redirect_route.rb
+++ b/app/models/redirect_route.rb
@@ -17,4 +17,32 @@ class RedirectRoute < ActiveRecord::Base
 
     where(wheres, path, "#{sanitize_sql_like(path)}/%")
   end
+
+  scope :permanent, -> do
+    if column_permanent_exists?
+      where(permanent: true)
+    else
+      none
+    end
+  end
+
+  scope :temporary, -> do
+    if column_permanent_exists?
+      where(permanent: [false, nil])
+    else
+      all
+    end
+  end
+
+  default_value_for :permanent, false
+
+  def permanent=(value)
+    if self.class.column_permanent_exists?
+      super
+    end
+  end
+
+  def self.column_permanent_exists?
+    ActiveRecord::Base.connection.column_exists?(:redirect_routes, :permanent)
+  end
 end
diff --git a/app/models/route.rb b/app/models/route.rb
index 97e8a6ad9e9..7ba3ec06041 100644
--- a/app/models/route.rb
+++ b/app/models/route.rb
@@ -8,6 +8,8 @@ class Route < ActiveRecord::Base
     presence: true,
     uniqueness: { case_sensitive: false }
 
+  validate :ensure_permanent_paths
+
   after_create :delete_conflicting_redirects
   after_update :delete_conflicting_redirects, if: :path_changed?
   after_update :create_redirect_for_old_path
@@ -40,7 +42,7 @@ class Route < ActiveRecord::Base
         # We are not calling route.delete_conflicting_redirects here, in hopes
         # of avoiding deadlocks. The parent (self, in this method) already
         # called it, which deletes conflicts for all descendants.
-        route.create_redirect(old_path) if attributes[:path]
+        route.create_redirect(old_path, permanent: permanent_redirect?) if attributes[:path]
       end
     end
   end
@@ -50,16 +52,30 @@ class Route < ActiveRecord::Base
   end
 
   def conflicting_redirects
-    RedirectRoute.matching_path_and_descendants(path)
+    RedirectRoute.temporary.matching_path_and_descendants(path)
   end
 
-  def create_redirect(path)
-    RedirectRoute.create(source: source, path: path)
+  def create_redirect(path, permanent: false)
+    RedirectRoute.create(source: source, path: path, permanent: permanent)
   end
 
   private
 
   def create_redirect_for_old_path
-    create_redirect(path_was) if path_changed?
+    create_redirect(path_was, permanent: permanent_redirect?) if path_changed?
+  end
+
+  def permanent_redirect?
+    source_type != "Project"
+  end
+
+  def ensure_permanent_paths
+    return if path.nil?
+
+    errors.add(:path, "#{path} has been taken before. Please use another one") if conflicting_redirect_exists?
+  end
+
+  def conflicting_redirect_exists?
+    RedirectRoute.permanent.matching_path_and_descendants(path).exists?
   end
 end