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Filename : cc_reset_rmc.py
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# (c) Copyright IBM Corp. 2020 All Rights Reserved
#
# Author: Aman Kumar Sinha <amansi26@in.ibm.com>
#
# This file is part of cloud-init. See LICENSE file for license information.
"""Reset RMC: Reset rsct node id"""


import os
from logging import Logger

from cloudinit import log as logging
from cloudinit import subp, util
from cloudinit.cloud import Cloud
from cloudinit.config import Config
from cloudinit.config.schema import MetaSchema
from cloudinit.distros import ALL_DISTROS
from cloudinit.settings import PER_INSTANCE

MODULE_DESCRIPTION = """\
Reset RMC module is IBM PowerVM Hypervisor specific

Reliable Scalable Cluster Technology (RSCT) is a set of software components,
that  together provide a comprehensive clustering environment (RAS features)
for IBM PowerVM based virtual machines. RSCT includes the Resource monitoring
and control (RMC) subsystem. RMC is a generalized framework used for managing,
monitoring, and manipulating resources. RMC runs as a daemon process on
individual machines and needs creation of unique node id and restarts
during VM boot.
More details refer
https://www.ibm.com/support/knowledgecenter/en/SGVKBA_3.2/admin/bl503_ovrv.htm

This module handles
- creation of the unique RSCT node id to every instance/virtual machine
  and ensure once set, it isn't changed subsequently by cloud-init.
  In order to do so, it restarts RSCT service.

Prerequisite of using this module is to install RSCT packages.
"""

meta: MetaSchema = {
    "id": "cc_reset_rmc",
    "name": "Reset RMC",
    "title": "reset rsct node id",
    "description": MODULE_DESCRIPTION,
    "distros": [ALL_DISTROS],
    "frequency": PER_INSTANCE,
    "examples": [],
    "activate_by_schema_keys": [],
}

# This module is undocumented in our schema docs
__doc__ = ""

# RMCCTRL is expected to be in system PATH (/opt/rsct/bin)
# The symlink for RMCCTRL and RECFGCT are
# /usr/sbin/rsct/bin/rmcctrl and
# /usr/sbin/rsct/install/bin/recfgct respectively.
RSCT_PATH = "/opt/rsct/install/bin"
RMCCTRL = "rmcctrl"
RECFGCT = "recfgct"

LOG = logging.getLogger(__name__)

NODE_ID_FILE = "/etc/ct_node_id"


def handle(
    name: str, cfg: Config, cloud: Cloud, log: Logger, args: list
) -> None:
    # Ensuring node id has to be generated only once during first boot
    if cloud.datasource.platform_type == "none":
        LOG.debug("Skipping creation of new ct_node_id node")
        return

    if not os.path.isdir(RSCT_PATH):
        LOG.debug("module disabled, RSCT_PATH not present")
        return

    orig_path = os.environ.get("PATH")
    try:
        add_path(orig_path)
        reset_rmc()
    finally:
        if orig_path:
            os.environ["PATH"] = orig_path
        else:
            del os.environ["PATH"]


def reconfigure_rsct_subsystems():
    # Reconfigure the RSCT subsystems, which includes removing all RSCT data
    # under the /var/ct directory, generating a new node ID, and making it
    # appear as if the RSCT components were just installed
    try:
        out = subp.subp([RECFGCT])[0]
        LOG.debug(out.strip())
        return out
    except subp.ProcessExecutionError:
        util.logexc(LOG, "Failed to reconfigure the RSCT subsystems.")
        raise


def get_node_id():
    try:
        fp = util.load_file(NODE_ID_FILE)
        node_id = fp.split("\n")[0]
        return node_id
    except Exception:
        util.logexc(LOG, "Failed to get node ID from file %s." % NODE_ID_FILE)
        raise


def add_path(orig_path):
    # Adding the RSCT_PATH to env standard path
    # So thet cloud init automatically find and
    # run RECFGCT to create new node_id.
    suff = ":" + orig_path if orig_path else ""
    os.environ["PATH"] = RSCT_PATH + suff
    return os.environ["PATH"]


def rmcctrl():
    # Stop the RMC subsystem and all resource managers so that we can make
    # some changes to it
    try:
        return subp.subp([RMCCTRL, "-z"])
    except Exception:
        util.logexc(LOG, "Failed to stop the RMC subsystem.")
        raise


def reset_rmc():
    LOG.debug("Attempting to reset RMC.")

    node_id_before = get_node_id()
    LOG.debug("Node ID at beginning of module: %s", node_id_before)

    # Stop the RMC subsystem and all resource managers so that we can make
    # some changes to it
    rmcctrl()
    reconfigure_rsct_subsystems()

    node_id_after = get_node_id()
    LOG.debug("Node ID at end of module: %s", node_id_after)

    # Check if new node ID is generated or not
    # by comparing old and new node ID
    if node_id_after == node_id_before:
        msg = "New node ID did not get generated."
        LOG.error(msg)
        raise Exception(msg)