docs: def remove(self, digest):
          """Remove an existing file from fsdb.
             File with the given digest will be removed from fsdb and
             the directory tree will be cleaned (remove empty folders)
           Args:
              digest -- digest of the file to remove
          """
          # remove file
          absPath = self.get_file_path(digest)
          os.remove(absPath)
  
          # clean directory tree
          tmpPath = os.path.dirname(absPath)
          while tmpPath != self.fsdbRoot:
              if os.path.islink(tmpPath):
                  raise Exception('fsdb found a link in db tree: "{0}"'.format(tmpPath))
              if len(os.listdir(tmpPath)) > 0:
                  break
              os.rmdir(tmpPath)
              tmpPath = os.path.dirname(tmpPath)
  
          self.logger.debug('Removed file: "{0}" [{1}]'.format(absPath, digest))