text: import distutils.command.bdist_rpm as orig
  
  class bdist_rpm(orig.bdist_rpm):
      """
      Override the default bdist_rpm behavior to do the following:
  
      1. Run egg_info to ensure the name and version are properly calculated.
      2. Always run 'install' using --single-version-externally-managed to
         disable eggs in RPM distributions.
      3. Replace dash with underscore in the version numbers for better RPM
         compatibility.
      """
  
      def run(self):
          # ensure distro name is up-to-date
          self.run_command('egg_info')
  
          orig.bdist_rpm.run(self)
  
      def _make_spec_file(self):
          version = self.distribution.get_version()
          rpmversion = version.replace('-','_')
          spec = orig.bdist_rpm._make_spec_file(self)
          line23 = '%define version ' + version
          line24 = '%define version ' + rpmversion
          spec = [
              line.replace(
                  "Source0: %{name}-%{version}.tar",
                  "Source0: %{name}-%{unmangled_version}.tar"
              ).replace(
                  "setup.py install ",
                  "setup.py install --single-version-externally-managed "
              ).replace(
                  "%setup",
                  "%setup -n %{name}-%{unmangled_version}"
              ).replace(line23, line24)
              for line in spec
          ]
          insert_loc = spec.index(line24) + 1
          unmangled_version = "%define unmangled_version " + version
          spec.insert(insert_loc, unmangled_version)
          return spec
  