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#!/bin/bash
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# ganeti master role OCF resource
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# See http://linux-ha.org/wiki/OCF_Resource_Agents
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set -e -u
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@SHELL_ENV_INIT@
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PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin
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SCRIPTNAME="@LIBDIR@/ocf/resource.d/ganeti/ganeti-master-role"
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# Master candidates list file
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MCFILE="$DATA_DIR/ssconf_master_candidates"
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# We'll need the hostname in a few places, so we'll get it once, now.
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MYHOSTNAME=$(hostname --fqdn)
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is_master() {
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  local -r master=$(gnt-cluster getmaster)
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  [[ "$MYHOSTNAME" == "$master" ]]
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}
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is_candidate() {
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  grep -Fx $MYHOSTNAME $MCFILE
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}
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start_action() {
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  if is_master; then
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    exit 0
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  elif is_candidate; then
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    gnt-cluster master-failover || exit 1 # OCF_ERR_GENERIC
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  else
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    exit 5 # OCF_ERR_INSTALLED (vital component missing)
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  fi
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}
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stop_action() {
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  # We can't really "stop" being a master.
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  # TODO: investigate whether a fake approach will do.
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  exit 1 # OCF_ERR_GENERIC
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}
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recover_action() {
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  if is_master; then
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    gnt-cluster redist-conf || exit 1 # OCF_ERR_GENERIC
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  elif is_candidate; then
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    gnt-cluster master-failover || exit 1 # OCF_ERR_GENERIC
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  else
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    exit 5 # OCF_ERR_INSTALLED (vital component missing)
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  fi
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}
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monitor_action() {
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  # monitor should exit:
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  #    7 if the resource is not running
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  #    1 if it failed
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  #    0 if it's running
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  if is_master; then
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    exit 0
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  elif is_candidate; then
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    exit 7 # OCF_NOT_RUNNING
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  else
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    exit 5 # OCF_ERR_INSTALLED (vital component missing)
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  fi
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}
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return_meta() {
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cat <<END
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<?xml version="1.0"?>
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<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
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<resource-agent name="ganeti-master-role" version="0.1">
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<version>0.1</version>
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<longdesc lang="en">
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OCF script to manage the ganeti master role in a cluster.
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Can be used to failover the ganeti master between master candidate nodes.
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</longdesc>
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<shortdesc lang="en">Manages the ganeti cluster master</shortdesc>
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<parameters/>
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<actions>
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<action name="start" timeout="300s" />
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<action name="stop" timeout="50s" />
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<action name="monitor" depth="0" timeout="10s" interval="30s" />
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<action name="meta-data" timeout="5s" />
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<action name="recover" timeout="20s" />
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<action name="reload" timeout="5s" />
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</actions>
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</resource-agent>
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END
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exit 0
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}
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case "$1" in
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  # Mandatory OCF commands
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  start)
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    start_action
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    ;;
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  stop)
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    stop_action
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    ;;
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  monitor)
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    monitor_action
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    ;;
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  meta-data)
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    return_meta
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    ;;
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  # Optional OCF commands
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  recover)
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    recover_action
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    ;;
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  reload)
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    # The ganeti master role has no "configuration" that is reloadable on
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    # the pacemaker side. We declare the operation anyway to make sure
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    # pacemaker doesn't decide to stop and start the service needlessly.
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    exit 0
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    ;;
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  promote|demote|migrate_to|migrate_from|validate-all)
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    # Not implemented (nor declared by meta-data)
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    exit 3 # OCF_ERR_UNIMPLEMENTED
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    ;;
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  *)
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    log_success_msg "Usage: $SCRIPTNAME {start|stop|monitor|meta-data|recover|reload}"
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    exit 1
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    ;;
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esac
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exit 0