old_contents: import re
  from external.distro import linux_distribution
  from spack.architecture import OperatingSystem
  
  
  class LinuxDistro(OperatingSystem):
      """ This class will represent the autodetected operating system
          for a Linux System. Since there are many different flavors of
          Linux, this class will attempt to encompass them all through
          autodetection using the python module platform and the method
          platform.dist()
      """
  
      def __init__(self):
          distname, version, _ = linux_distribution(
              full_distribution_name=False)
          distname, version = str(distname), str(version)
  
          # Grabs major version from tuple on redhat; on other platforms
          # grab the first legal identifier in the version field.  On
          # debian you get things like 'wheezy/sid'; sid means unstable.
          # We just record 'wheezy' and don't get quite so detailed.
          version = re.split(r'[^\w-]', version)[0]
  
          super(LinuxDistro, self).__init__(distname, version)
  
new_contents: import re
  from spack.architecture import OperatingSystem
  
  
  class LinuxDistro(OperatingSystem):
      """ This class will represent the autodetected operating system
          for a Linux System. Since there are many different flavors of
          Linux, this class will attempt to encompass them all through
          autodetection using the python module platform and the method
          platform.dist()
      """
  
      def __init__(self):
          try:
              # This will throw an error if imported on a non-Linux platform.
              from external.distro import linux_distribution
              distname, version, _ = linux_distribution(
                  full_distribution_name=False)
              distname, version = str(distname), str(version)
          except ImportError as e:
              distname, version = 'unknown', ''
  
          # Grabs major version from tuple on redhat; on other platforms
          # grab the first legal identifier in the version field.  On
          # debian you get things like 'wheezy/sid'; sid means unstable.
          # We just record 'wheezy' and don't get quite so detailed.
          version = re.split(r'[^\w-]', version)[0]
  
          super(LinuxDistro, self).__init__(distname, version)
  
subject: Fix bug in distribution detection on unsupported platforms.