fixes distinction between renaming a file and updating its content and

refactors update file

CHANGELOG

@@ -18,6 +18,7 @@ v 8.12.0 (unreleased)
   - Fix pagination on user snippets page
   - Escape search term before passing it to Regexp.new !6241 (winniehell)
   - Fix pinned sidebar behavior in smaller viewports !6169
+  - Fix file permissions change when updating a file on the Gitlab UI !5979
   - Change merge_error column from string to text type
   - Reduce contributions calendar data payload (ClemMakesApps)
   - Add `web_url` field to issue, merge request, and snippet API objects (Ben Boeckel)

app/controllers/concerns/creates_commit.rb

@@ -7,8 +7,7 @@ module CreatesCommit
     commit_params = @commit_params.merge(
       source_project: @project,
       source_branch: @ref,
-      target_branch: @target_branch,
-      previous_path: @previous_path
+      target_branch: @target_branch
     )
     result = service.new(@tree_edit_project, current_user, commit_params).execute

app/controllers/projects/blob_controller.rb

@@ -38,12 +38,7 @@ class Projects::BlobController < Projects::ApplicationController
   end
   def update
-    if params[:file_path].present?
-      @previous_path = @path
-      @path = params[:file_path]
-      @commit_params[:file_path] = @path
-    end
-
+    @path = params[:file_path] if params[:file_path].present?
     after_edit_path =
       if from_merge_request && @target_branch == @ref
         diffs_namespace_project_merge_request_path(from_merge_request.target_project.namespace, from_merge_request.target_project, from_merge_request) +
@@ -143,6 +138,8 @@ class Projects::BlobController < Projects::ApplicationController
           params[:file_name] = params[:file].original_filename
         end
         File.join(@path, params[:file_name])
+      elsif params[:file_path].present?
+        params[:file_path]
       else
         @path
       end
@@ -155,6 +152,7 @@ class Projects::BlobController < Projects::ApplicationController
     @commit_params = {
       file_path: @file_path,
       commit_message: params[:commit_message],
+      previous_path: @path,
       file_content: params[:content],
       file_content_encoding: params[:encoding],
       last_commit_sha: params[:last_commit_sha]

app/models/repository.rb

@@ -813,7 +813,7 @@ class Repository
         update: true
       }
-      if previous_path
+      unless previous_path == path || previous_path.blank?
         options[:file][:previous_path] = previous_path
         Gitlab::Git::Blob.rename(raw_repository, options)
       else