BUGFIX: BackupChunksMerger

- actually remove the tmp directory
- merge all the chunks into a .tmp archive and then remove the .tmp extension once done

app/jobs/regular/backup_chunks_merger.rb

@@ -8,29 +8,33 @@ module Jobs
       identifier = args[:identifier]
       chunks     = args[:chunks].to_i
 
-      raise Discourse::InvalidParameters.new(:filename) if filename.blank?
+      raise Discourse::InvalidParameters.new(:filename)   if filename.blank?
       raise Discourse::InvalidParameters.new(:identifier) if identifier.blank?
-      raise Discourse::InvalidParameters.new(:chunks) if chunks <= 0
+      raise Discourse::InvalidParameters.new(:chunks)     if chunks <= 0
 
-      backup = "#{Backup.base_directory}/#{filename}"
+      backup_path = "#{Backup.base_directory}/#{filename}"
+      tmp_backup_path = "#{backup_path}.tmp"
 
-      # delete destination
-      File.delete(backup) rescue nil
+      # delete destination files
+      File.delete(backup_path) rescue nil
+      File.delete(tmp_backup_path) rescue nil
 
       # merge all the chunks
-      File.open(backup, "a") do |backup|
+      File.open(tmp_backup_path, "a") do |backup|
         (1..chunks).each do |chunk_number|
           # path to chunk
-          path = Backup.chunk_path(identifier, filename, chunk_number)
+          chunk_path = Backup.chunk_path(identifier, filename, chunk_number)
           # add chunk to backup
-          backup << File.open(path).read
-          # delete chunk
-          File.delete(path) rescue nil
+          backup << File.open(chunk_path).read
         end
       end
+      
+      # rename tmp backup to final backup name
+      FileUtils.mv(tmp_backup_path, backup_path, force: true)
 
       # remove tmp directory
-      FileUtils.rm_rf(directory) rescue nil
+      tmp_directory = File.dirname(Backup.chunk_path(identifier, filename, 0))
+      FileUtils.rm_rf(tmp_directory) rescue nil
     end
 
   end