code: def install_docs(instance, clear_target):
      
  
      _check_root()
  
      def make_docs():
          """Trigger a Sphinx make command to build the documentation."""
          log("Generating HTML documentation")
  
          try:
              build = Popen(
                  [
                      'make',
                      'html'
                  ],
                  cwd='docs/'
              )
  
              build.wait()
          except Exception as e:
              log("Problem during documentation building: ", e, type(e),
                  exc=True, lvl=error)
              return False
          return True
  
      make_docs()
  
      # If these need changes, make sure they are watertight and don't remove
      # wanted stuff!
      target = os.path.join('/var/lib/hfos', instance, 'frontend/docs')
      source = 'docs/build/html'
  
      log("Updating documentation directory:", target)
  
      if not os.path.exists(os.path.join(os.path.curdir, source)):
          log(
              "Documentation not existing yet. Run python setup.py "
              "build_sphinx first.", lvl=error)
          return
  
      if os.path.exists(target):
          log("Path already exists: " + target)
          if clear_target:
              log("Cleaning up " + target, lvl=warn)
              shutil.rmtree(target)
  
      log("Copying docs to " + target)
      copy_tree(source, target)
      log("Done: Install Docs")
docs: Builds and installs the complete HFOS documentation.