Synnefo » snf-ganeti

#!/bin/bash

#

# Copyright (C) 2009, 2011, 2012 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

readonly defaults_file="${GANETI_ROOTDIR}@SYSCONFDIR@/default/ganeti"

readonly localstatedir="${GANETI_ROOTDIR}@LOCALSTATEDIR@"

# This is a list of all daemons and the order in which they're started. The

# order is important as there are dependencies between them. On shutdown,

# they're stopped in reverse order.

DAEMONS=(

  ganeti-noded

  ganeti-masterd

  ganeti-rapi

  )

_confd_enabled() {

  [[ "@CUSTOM_ENABLE_CONFD@" == True ]]

}

if _confd_enabled; then

  DAEMONS+=( ganeti-confd )

fi

NODED_ARGS=

MASTERD_ARGS=

CONFD_ARGS=

RAPI_ARGS=

# Read defaults file if it exists

if [[ -s $defaults_file ]]; then

  . $defaults_file

fi

# Meant to facilitate use utilities in /etc/rc.d/init.d/functions in case

# start-stop-daemon is not available.

_ignore_error() {

  eval "$@" || :

}

_daemon_pidfile() {

  echo "$localstatedir/run/ganeti/$1.pid"

}

_daemon_executable() {

  echo "@PREFIX@/sbin/$1"

}

_daemon_usergroup() {

  case "$1" in

    masterd)

      echo "@GNTMASTERUSER@:@GNTMASTERDGROUP@"

      ;;

    confd)

      echo "@GNTCONFDUSER@:@GNTCONFDGROUP@"

      ;;

    rapi)

      echo "@GNTRAPIUSER@:@GNTRAPIGROUP@"

      ;;

    noded)

      echo "@GNTNODEDUSER@:@GNTDAEMONSGROUP@"

      ;;

    *)

      echo "root:@GNTDAEMONSGROUP@"

      ;;

  esac

}

# Checks whether the local machine is part of a cluster

check_config() {

  local server_pem=$localstatedir/lib/ganeti/server.pem

  local fname

  for fname in $server_pem; do

    if [[ ! -f $fname ]]; then

      echo "Missing configuration file $fname" >&2

      return 1

    fi

  done

  return 0

}

# Checks the exit code of a daemon

check_exitcode() {

  if [[ "$#" -lt 1 ]]; then

    echo 'Missing exit code.' >&2

    return 1

  fi

  local rc="$1"; shift

  case "$rc" in

    0) ;;

    11)

      echo "not master"

    ;;

    *)

      echo "exit code $rc"

      return 1

    ;;

  esac

  return 0

}

# Prints path to PID file for a daemon.

daemon_pidfile() {

  if [[ "$#" -lt 1 ]]; then

    echo 'Missing daemon name.' >&2

    return 1

  fi

  local name="$1"; shift

  _daemon_pidfile $name

}

# Prints path to daemon executable.

daemon_executable() {

  if [[ "$#" -lt 1 ]]; then

    echo 'Missing daemon name.' >&2

    return 1

  fi

  local name="$1"; shift

  _daemon_executable $name

}

# Prints a list of all daemons in the order in which they should be started

list_start_daemons() {

  local name

  for name in "${DAEMONS[@]}"; do

    echo "$name"

  done

}

# Prints a list of all daemons in the order in which they should be stopped

list_stop_daemons() {

  list_start_daemons | tac

}

# Checks whether a daemon name is known

is_daemon_name() {

  if [[ "$#" -lt 1 ]]; then

    echo 'Missing daemon name.' >&2

    return 1

  fi

  local name="$1"; shift

  for i in "${DAEMONS[@]}"; do

    if [[ "$i" == "$name" ]]; then

      return 0

    fi

  done

  echo "Unknown daemon name '$name'" >&2

  return 1

}

# Checks whether daemon is running

check() {

  if [[ "$#" -lt 1 ]]; then

    echo 'Missing daemon name.' >&2

    return 1

  fi

  local name="$1"; shift

  local pidfile=$(_daemon_pidfile $name)

  local daemonexec=$(_daemon_executable $name)

  if type -p start-stop-daemon >/dev/null; then

    start-stop-daemon --stop --signal 0 --quiet \

      --pidfile $pidfile

  else

    _ignore_error status \

      -p $pidfile \

      $daemonexec

  fi

}

# Starts a daemon

start() {

  if [[ "$#" -lt 1 ]]; then

    echo 'Missing daemon name.' >&2

    return 1

  fi

  local name="$1"; shift

  # Convert daemon name to uppercase after removing "ganeti-" prefix

  local plain_name=${name#ganeti-}

  local ucname=$(tr a-z A-Z <<<$plain_name)

  local pidfile=$(_daemon_pidfile $name)

  local usergroup=$(_daemon_usergroup $plain_name)

  local daemonexec=$(_daemon_executable $name)

  if [[ "$name" == ganeti-confd ]] && ! _confd_enabled; then

    echo 'ganeti-confd disabled at build time' >&2

    return 1

  fi

  # Read $<daemon>_ARGS and $EXTRA_<daemon>_ARGS

  eval local args="\"\$${ucname}_ARGS \$EXTRA_${ucname}_ARGS\""

  @PKGLIBDIR@/ensure-dirs

  if type -p start-stop-daemon >/dev/null; then

    start-stop-daemon --start --quiet --oknodo \

      --pidfile $pidfile \

      --startas $daemonexec \

      --chuid $usergroup \

      -- $args "$@"

  else

    # TODO: Find a way to start daemon with a group, until then the group must

    # be removed

    _ignore_error daemon \

      --pidfile $pidfile \

      --user ${usergroup%:*} \

      $daemonexec $args "$@"

  fi

}

# Stops a daemon

stop() {

  if [[ "$#" -lt 1 ]]; then

    echo 'Missing daemon name.' >&2

    return 1

  fi

  local name="$1"; shift

  local pidfile=$(_daemon_pidfile $name)

  if type -p start-stop-daemon >/dev/null; then

    start-stop-daemon --stop --quiet --oknodo --retry 30 \

      --pidfile $pidfile

  else

    _ignore_error killproc -p $pidfile $name

  fi

}

# 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

}

# Start all daemons

start_all() {

  for i in $(list_start_daemons); do

    local rc=0

    # Try to start daemon

    start $i || rc=$?

    if ! errmsg=$(check_exitcode $rc); then

      echo "$errmsg" >&2

      return 1

    fi

  done

  return 0

}

# Stop all daemons

stop_all() {

  for i in $(list_stop_daemons); do

    stop $i

  done

}

# Reloads the SSH keys

reload_ssh_keys() {

  @RPL_SSH_INITD_SCRIPT@ restart

}

# Read @SYSCONFDIR@/rc.d/init.d/functions if start-stop-daemon not available

if ! type -p start-stop-daemon >/dev/null && \

   [[ -f @SYSCONFDIR@/rc.d/init.d/functions ]]; then

  _ignore_error . @SYSCONFDIR@/rc.d/init.d/functions

fi

if [[ "$#" -lt 1 ]]; then

  echo "Usage: $0 <action>" >&2

  exit 1

fi

orig_action=$1; shift

if [[ "$orig_action" == *_* ]]; then

  echo "Command must not contain underscores" >&2

  exit 1

fi

# 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

$action "$@"