def validate_java_availability()

in python-cli/mft_cli/airavata_mft_cli/bootstrap.py [0:0]

• 21 lines of code
• 7 McCabe index (conditional complexity)

def validate_java_availability(required_version):
  """
      Issue 96: https://github.com/apache/airavata-mft/issues/96

      References:
      ---------
      https://stackoverflow.com/questions/31807882/get-java-version-number-from-python
      https://stackoverflow.com/questions/1332598/how-to-determine-whether-java-is-installed-on-a-system-through-python
      https://stackoverflow.com/questions/74206258/how-are-oracle-jdk-versions-numbered
      https://docs.python.org/3.8/library/subprocess.html#subprocess.check_output
      https://stackoverflow.com/questions/2411288/java-versioning-and-terminology-1-6-vs-6-0-openjdk-vs-sun
  """
  if shutil.which("java"):
    res = check_output(['java', '-version'], stderr=STDOUT).decode('utf-8')
    """
      res will have the value similar to the following
      openjdk version "17.0.5" 2022-10-18 LTS
      OpenJDK Runtime Environment Corretto-17.0.5.8.1 (build 17.0.5+8-LTS)
      OpenJDK 64-Bit Server VM Corretto-17.0.5.8.1 (build 17.0.5+8-LTS, mixed mode, sharing)
    """
    java_version = ''
    count = 0
    for c in res:
      if c == '"' or count == 1:
        if (c == '.' or c == '"') and count == 1:
          break
        if count == 0:
          count += 1
          continue
        java_version += c

    java_version = int(java_version)
    if java_version < required_version:
      print("Airavata MFT requires Java version " + required_version + " or higher")
      print("If you have more than one version of java please set java version "+ required_version +" or higher to the path")
      raise typer.Exit()
  else:
    print("Java is either not installed or path hasn't been set properly")
    raise typer.Exit()