3 files changed, 20 insertions, 1 deletions
diff --git a/app/controllers/projects/blob_controller.rb b/app/controllers/projects/blob_controller.rb
index 4eda76f4f21..dd2f980e880 100644
--- a/app/controllers/projects/blob_controller.rb
+++ b/app/controllers/projects/blob_controller.rb
@@ -31,6 +31,7 @@ class Projects::BlobController < Projects::ApplicationController
   before_action :authorize_edit_tree!, only: [:new, :create, :update, :destroy]
 
   before_action :commit, except: [:new, :create]
+  before_action :check_for_ambiguous_ref, only: [:show]
   before_action :blob, except: [:new, :create]
   before_action :require_branch_head, only: [:edit, :update]
   before_action :editor_variables, except: [:show, :preview, :diff]
@@ -145,6 +146,15 @@ class Projects::BlobController < Projects::ApplicationController
     end
   end
 
+  def check_for_ambiguous_ref
+    @ref_type = ref_type
+
+    if @ref_type == ExtractsRef::BRANCH_REF_TYPE && ambiguous_ref?(@project, @ref)
+      branch = @project.repository.find_branch(@ref)
+      redirect_to project_blob_path(@project, File.join(branch.target, @path))
+    end
+  end
+
   def commit
     @commit ||= @repository.commit(@ref)
 
diff --git a/app/controllers/projects/refs_controller.rb b/app/controllers/projects/refs_controller.rb
index 8ac6d872aae..0b52d03ab95 100644
--- a/app/controllers/projects/refs_controller.rb
+++ b/app/controllers/projects/refs_controller.rb
@@ -22,7 +22,7 @@ class Projects::RefsController < Projects::ApplicationController
           when "tree"
             project_tree_path(@project, @id)
           when "blob"
-            project_blob_path(@project, @id)
+            project_blob_path(@project, @id, ref_type: ref_type)
           when "graph"
             if Feature.enabled?(:use_ref_type_parameter, @project)
               project_network_path(@project, @id, ref_type: ref_type)
diff --git a/app/controllers/projects/tree_controller.rb b/app/controllers/projects/tree_controller.rb
index 737a6290431..1f7912e15df 100644
--- a/app/controllers/projects/tree_controller.rb
+++ b/app/controllers/projects/tree_controller.rb
@@ -28,6 +28,15 @@ class Projects::TreeController < Projects::ApplicationController
   def show
     return render_404 unless @commit
 
+    @ref_type = ref_type
+    if @ref_type == BRANCH_REF_TYPE && ambiguous_ref?(@project, @ref)
+      branch = @project.repository.find_branch(@ref)
+      if branch
+        redirect_to project_tree_path(@project, branch.target)
+        return
+      end
+    end
+
     if tree.entries.empty?
       if @repository.blob_at(@commit.id, @path)
         redirect_to project_blob_path(@project, File.join(@ref, @path))