#!/bin/bash
#

# Copyright (C) 2009 Google Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.

set -e

defaults_file=@SYSCONFDIR@/default/ganeti

NODED_ARGS=
MASTERD_ARGS=
CONFD_ARGS=
RAPI_ARGS=

# Read defaults file if it exists
if [[ -s $defaults_file ]]; then
  . $defaults_file
fi

_daemon_pidfile() {
  echo "@LOCALSTATEDIR@/run/ganeti/$1.pid"
}

# Checks whether daemon is running
check() {
  if [[ "$#" -lt 1 ]]; then
    echo 'Missing daemon name.' >&2
    exit 1
  fi

  local name="$1"; shift

  start-stop-daemon --stop --signal 0 --quiet \
    --pidfile $(_daemon_pidfile $name)
}

# Starts a daemon
start() {
  if [[ "$#" -lt 1 ]]; then
    echo 'Missing daemon name.' >&2
    exit 1
  fi

  local name="$1"; shift

  # Convert daemon name to uppercase after removing "ganeti-" prefix
  local ucname=$(tr a-z A-Z <<< ${name#ganeti-})

  # Read $<daemon>_ARGS and $EXTRA_<daemon>_ARGS
  eval local args="\$${ucname}_ARGS \$EXTRA_${ucname}_ARGS"

  start-stop-daemon --start --quiet --oknodo \
    --pidfile $(_daemon_pidfile $name) \
    --startas "@PREFIX@/sbin/$name" \
    -- $args "$@"
}

# Stops a daemon
stop() {
  if [[ "$#" -lt 1 ]]; then
    echo 'Missing daemon name.' >&2
    exit 1
  fi

  local name="$1"; shift

  start-stop-daemon --stop --quiet --oknodo --retry 30 \
    --pidfile $(_daemon_pidfile $name)
}

# Starts a daemon if it's not yet running
check_and_start() {
  local name="$1"

  if ! check $name; then
    start $name
  fi
}

# Starts the master role
start_master() {
  start ganeti-masterd
  start ganeti-rapi
}

# Stops the master role
stop_master() {
  stop ganeti-rapi
  stop ganeti-masterd
}

if [[ "$#" -lt 1 ]]; then
  echo "Usage: $0 <action>" >&2
  exit 1
fi

orig_action=$1; shift

# Replace all dashes (-) with underlines (_)
action=${orig_action//-/_}

# Is it a known function?
if ! declare -F "$action" >/dev/null 2>&1; then
  echo "Unknown command: $orig_action" >&2
  exit 1
fi

# Call handler function
$action "$@"