#! /bin/sh
# This file is part of BEAM
# Copyright (C) 2012 Sergey Poznyakoff
#
# BEAM 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 3, or (at your option)
# any later version.
#
# BEAM 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 BEAM.  If not, see <http://www.gnu.org/licenses/>.

# Configuration keywords:
#
# item_type=postgres            [mandatory]
# item_database=STRING          [mandatory]

# postgres_check item
postgres_check() {
  local database
  
  eval database=\$${1}_database
  test -z "$database" && error "${1}_database not set" && return 1
  return 0
}

# postgres_list item prefix
postgres_list() {
  local database
  
  eval database=\$${1}_database
  echo "${2}PostgreSQL database $database"
}

# postgres_backup item
postgres_backup() {
  local database

  eval database=\$${1}_database
  logit "backing up PostgreSQL database $database"
  test -z "$database" && abend 1 "${1}_database not set"
  if [ -z "$dry_run" ]; then
    su postgres -c "pg_dump $verbose $database" > $backup_tmp_dir/$1-$week-$round-$level    
  else
    echo "su postgres -c \"pg_dump $verbose $database\" > $backup_tmp_dir/$1-$week-$round-$level"
  fi

  if [ $? -ne 0 ]; then
    tarerror=$((tarerror + 1))
    logit "failed"
  else
    logit "creating $1-$week-$round-$level.$tar_suffix"
    $dry_run tar $verbose $taroptions \
	      -f $backup_archive_dir/$1-$week-$round-$level.$tar_suffix \
              -C $backup_tmp_dir $1-$week-$round-$level
    tarcode $?
    $dry_run rm $backup_tmp_dir/$1-$week-$round-$level
  fi
}

postgres_restore() {
  local u database

  eval database=\$${1}_database
  logit "restoring PostgreSQL database $database"
  u=$(umask)
  trap "umask $u" 1 2 3 13 15
  umask 077
  $dry_run tar $verbose $taroptions \
           -f $backup_archive_dir/$1-$week-$round-$level.$tar_suffix
  e=$?
  tarcode $e
  if [ $e -eq 0 ]; then
    logit "restoring database from the dump"
    if [ -n "$dry_run" ]; then
      cat <<-EOT
	su postgres -c "dropdb $database"
	su postgres -c "createdb $database"
	su postgres -c "psql -d $database -f $1-$week-$round-$level"
	rm $1-$week-$round-$level
EOT
    elif [ -r $1-$week-$round-$level ]; then
      su postgres -c "dropdb $database"
      su postgres -c "createdb $database"
      su postgres -c "psql -d $database -f $1-$week-$round-$level" > db-$1.log
      if grep ERROR db-$1.log >/dev/null; then
        error "errors occurred during restore; see db-$1.log for details"
	error "dump preserved in file $1-$week-$round-$level"
	tarerror=$((tarerror + 1))
      else
        rm $1-$week-$round-$level
      fi
    fi
  fi
  umask $u
  trap - 1 2 3 13 15
}