java.py 文件源码

def _find_java_home(self):
        if self._java_home:
            return self._java_home

        # First check if the enviornment variable is set.
        java_home = os.environ.get("JAVA_HOME", None)
        if java_home:
            return java_home

        # On OS X, there's a magical command that gives you $JAVA_HOME
        if sys.platform == "darwin":
            try:
                cmd = sh.Command("/usr/libexec/java_home")
                return cmd().strip()
            except sh.ErrorReturnCode:
                pass

        # If only one Java is installed in the default Linux JVM folder, use
        # that
        if sys.platform in {"linux", "linux2"}:
            if os.path.isdir(self.DEFAULT_LINUX_JVM):
                javas = os.listdir(self.DEFAULT_LINUX_JVM)
                if len(javas) == 1:
                    return javas[0]

        # Give up
        return None