code: def _read_config_imp(filenames, dirs=None):
      def _read_config(f):
          meta, vars, sections, reqs = parse_config(f, dirs)
          # recursively add sections and variables of required libraries
          for rname, rvalue in reqs.items():
              nmeta, nvars, nsections, nreqs = _read_config(
                  pkg_to_filename(rvalue)
              )
  
              # Update var dict for variables not in 'top' config file
              for k, v in nvars.items():
                  if not k in vars:
                      vars[k] = v
  
              # Update sec dict
              for oname, ovalue in nsections[rname].items():
                  if ovalue:
                      sections[rname][oname] += " %s" % ovalue
  
          return meta, vars, sections, reqs
  
      meta, vars, sections, reqs = _read_config(filenames)
  
      # FIXME: document this. If pkgname is defined in the variables section, and
      # there is no pkgdir variable defined, pkgdir is automatically defined to
      # the path of pkgname. This requires the package to be imported to work
      if not "pkgdir" in vars and "pkgname" in vars:
          pkgname = vars["pkgname"]
          if not pkgname in sys.modules:
              raise ValueError(
                  "You should import %s to get information on %s"
                  % (pkgname, meta["name"])
              )
  
          mod = sys.modules[pkgname]
          vars["pkgdir"] = _escape_backslash(
              os.path.dirname(mod.__file__)
          )
  
      return LibraryInfo(
          name=meta["name"],
          description=meta["description"],
          version=meta["version"],
          sections=sections,
          vars=VariableSet(vars),
      )
  
imports: from __future__ import division, absolute_import, print_function
  import sys
  import re
  import os
label_desc: Use image node_id 8 for calling a global function with example usage: _read_config_imp(filenames, dirs) and returns: LibraryInfo, meta,  vars,  sections,  reqs