Munin contributed plugins

VM_NAME_REGEX = re.compile("^.*\x00-{arg_name}\x00(.+)\x00.*$")

        name = None

        name_arg_values = _get_kvm_process_arguments(pid, "name")

        if name_arg_values:

            name_arg_value = name_arg_values[0]

            if "," in name_arg_value:

                # the modern parameter format may look like this:

                #    guest=foo,debug-threads=on

                for index, token in enumerate(name_arg_value.split(",")):

                    if (index == 0) and ("=" not in token):

                        # the first item may the plain name

                        name = value

                    elif "=" in token:

                        key, value = token.split("=", 1)

                        if key == "guest":

                            name = value

                    else:

                        # unknown format (no "mapping")

                        pass

            else:

                name = name_arg_value

        if name is None:

            print("Failed to parse VM name from commandline of process: {}"

                  .format(name_arg_values), file=sys.stderr)

        else:

            result[pid] = clean_vm_name(name)

def _get_kvm_process_arguments(pid, arg_name):

    """ parse all value with the given name from the process identified by PID

    The result is a list of tokens, that follow this argument name. The result

    is empty in case of problems.

    """

    # the "cmdline" (e.g. /proc/self/cmdline) is a null-separated token list

    try:

        with open("/proc/%s/cmdline" % pid, "r") as cmdline_file:

            cmdline = cmdline_file.read()

    except IOError:

        # the process seems to have died meanwhile

        return []

    is_value = False

    result = []

    for arg_token in cmdline.split("\0"):

        if is_value:

            # the previous token was our argument name

            result.append(arg_token)

            is_value = False

        elif arg_token == "-{}".format(arg_name):

            # this is our argument name - we want to store the next value

            is_value = True

        else:

            # any other irrelevant value

            pass

    return result