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/usr/share/backupninja/pgsql is in backupninja 1.0.1-2.

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The actual contents of the file can be viewed below.

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# -*- mode: sh; sh-basic-offset: 3; indent-tabs-mode: nil; -*-
# vim: set filetype=sh sw=3 sts=3 expandtab autoindent:
#
# PostgreSQL handler script for backupninja
#

getconf backupdir /var/backups/postgres
getconf databases all
getconf compress yes
getconf vsname
# format maps to pg_dump --format= option, old/default was plain
getconf format plain

localhost=`hostname`

# Decide if the handler should operate on a vserver or on the host.
# In the former case, check that $vsname exists and is running.
usevserver=no
vroot=''
if [ $vservers_are_available = yes ]; then
   if [ -n "$vsname" ]; then
      # does it exist ?
      if ! vservers_exist "$vsname" ; then
         fatal "The vserver given in vsname ($vsname) does not exist."
      fi
      # is it running ?
      vservers_running $vsname || fatal "The vserver $vsname is not running."
      # everything ok
      info "Using vserver '$vsname'."
      usevserver=yes
      vroot="$VROOTDIR/$vsname"
   else
      info "No vserver name specified, actions will be performed on the host."
   fi
fi

# Make sure that the system to backup has the needed executables
if [ $usevserver = yes ]; then
   debug "Examining vserver '$vsname'."
   if [ "$databases" == "all" ] && [ "$format" = "plain" ]; then
      [ -x "$vroot`$VSERVER $vsname exec which $PGSQLDUMPALL`" ] || \
         fatal "Can't find $PGSQLDUMPALL in vserver $vsname."
   elif [ "$format" != "plain" ]; then
      [ -x "$vroot`$VSERVER $vsname exec which $PGSQLDUMPALL`" ] || \
         fatal "Can't find $PGSQLDUMPALL in vserver $vsname."
      [ -x "$vroot`$VSERVER $vsname exec which $PGSQLDUMP`" ] || \
         fatal "Can't find $PGSQLDUMP in vserver $vsname."
      [ -x "$vroot`$VSERVER $vsname exec which $PSQL`" ] || \
         fatal "Can't find $PSQL in vserver $vsname."
   else
      [ -x "$vroot`$VSERVER $vsname exec which $PGSQLDUMP`" ] || \
         fatal "Can't find $PGSQLDUMP in vserver $vsname."
   fi
else
   if [ "$databases" == "all" ] && [ "$format" = "plain" ]; then
      [ -x "`which $PGSQLDUMPALL`" ] || \
         fatal "Can't find $PGSQLDUMPALL."
   elif [ "$format" != "plain" ]; then
      [ -x "`which $PGSQLDUMPALL`" ] || \
         fatal "Can't find $PGSQLDUMPALL."
      [ -x "`which $PGSQLDUMP`" ] || \
         fatal "Can't find $PGSQLDUMP."
      [ -x "`which $PSQL`" ] || \
         fatal "Can't find $PSQL."
   else
      [ -x "`which $PGSQLDUMP`" ] || \
         fatal "Can't find $PGSQLDUMP."
   fi
fi

# create backup dir, the vroot variable will be empty if no vsname was specified
# and will proceed to operate on the host
[ -d $vroot$backupdir ] || (debug "mkdir -p $vroot$backupdir"; mkdir -p $vroot$backupdir)
[ -d $vroot$backupdir ] || fatal "Backup directory '$vroot$backupdir' does not exist, and could not be created."

# give backup dir the good uid and permissions
# (in respect to the vserver, if $usevserver = yes)
if [ $usevserver = yes ]; then
   pguid=`$VSERVER $vsname exec getent passwd $PGSQLUSER | /usr/bin/awk -F: '{print $3}'`
else
   pguid=`getent passwd $PGSQLUSER | /usr/bin/awk -F: '{print $3}'`
fi
[ -n "$pguid" ] || \
   fatal "No user called $PGSQLUSER`[ $usevserver = no ] || echo \" on vserver $vsname\"`."
debug "chown $pguid $vroot$backupdir"
chown $pguid $vroot$backupdir
debug "chmod 700 $vroot$backupdir"
chmod 700 $vroot$backupdir


# If we are using the custom (best) or tar pg_dump format, and
# dumping "all" databases, we will substitute "all" for a list
# of all non-template databases to avoid the use of pg_dumpall.
dumpglobals="no"
if [ "$databases" = "all" ] && [ "$format" != "plain" ]; then
   cmdprefix=""
   if [ "$usevserver" = "yes" ]; then
      	cmdprefix="$VSERVER $vsname exec "
   fi
   execstr="${cmdprefix} su - $PGSQLUSER -c 'psql -AtU $PGSQLUSER -c \"SELECT datname FROM pg_database WHERE NOT datistemplate\"'"
   debug execstr
   dblist=""
   for db in $(eval $execstr 2>&1); do
      dblist="$dblist $db"
   done
   if [ "$dblist" != "" ]; then
      databases="$dblist"
   fi
   # Dump globals (pg_dumpall -g) for roles and tablespaces
   dumpglobals="yes"
fi


# if $databases = all, use pg_dumpall
if [ "$databases" == "all" ]; then
   if [ $usevserver = yes ]; then
      if [ "$compress" == "yes" ]; then
         execstr="$VSERVER $vsname exec su - $PGSQLUSER -s /bin/bash -c \"set -o pipefail ; $PGSQLDUMPALL | $GZIP $GZIP_OPTS > '$backupdir/${vsname}.sql.gz'\""
      else
         execstr="$VSERVER $vsname exec su - $PGSQLUSER -c \"$PGSQLDUMPALL > '$backupdir/${vsname}.sql'\""
      fi
   else
      if [ "$compress" == "yes" ]; then
         execstr="su - $PGSQLUSER -s /bin/bash -c \"set -o pipefail ; $PGSQLDUMPALL | $GZIP $GZIP_OPTS > '$backupdir/${localhost}-all.sql.gz'\""
      else
         execstr="su - $PGSQLUSER -c \"$PGSQLDUMPALL > '$backupdir/${localhost}-all.sql'\""
      fi
   fi
   debug "$execstr"
   if [ ! $test ]; then
      output=`eval $execstr 2>&1`
      code=$?
      if [ "$code" == "0" ]; then
         debug $output
         info "Successfully finished dump of pgsql cluster"
      else
         warning $output
         warning "Failed to dump pgsql cluster"
      fi
   fi

# else use pg_dump on each specified database
else
   # If we're not doing plain format, database=all may now be database=list
   # so we track the database=all selection in dumpglobals which tells us
   # to also dump the roles and tablespaces via pg_dumpall -g
   if [ "$dumpglobals" = "yes" ]; then
      globalscmd=""
      if [ "$compress" == "yes" ]; then
         globalscmd="set -o pipefail ; $PGSQLDUMPALL -g | $GZIP $GZIP_OPTS > '$backupdir/globals.sql.gz'"
      else
         globalscmd="$PGSQLDUMPALL -g > '$backupdir/globals.sql'"
      fi
      if [ $usevserver = yes ]; then
         execstr="$VSERVER $vsname exec su - $PGSQLUSER -s /bin/bash -c \"$globalscmd\""
      else
         execstr="su - $PGSQLUSER -s /bin/bash -c \"$globalscmd\""
      fi
      debug "$execstr"
      if [ ! $test ]; then
         output=`eval $execstr 2>&1`
         code=$?
         if [ "$code" == "0" ]; then
            debug $output
            info "Successfully finished pgsql globals (roles and tablespaces) dump"
         else
            warning $output
            warning "Failed to dump pgsql globals (roles and tablespaces)"
         fi
      fi
   fi
   for db in $databases; do
      dumpext="sql"
      if [ "$format" != "plain" ]; then
         dumpext="pg_dump"
      fi
      # To better support the backupninja global GZIP and rsync-friendly GZIP_OPTS
      # the custom archive format is told to disable compression. The plain format
      # is uncompressed by default and the tar format doesn't support pg_dump compression.
      disablecustomcompress=""
      if [ "$format" = "custom" ]; then
         disablecustomcompress="--compress=0"
      fi
      dumpcmd=""
      globalscmd=""
      if [ "$compress" == "yes" ]; then
         dumpcmd="set -o pipefail ; $PGSQLDUMP --format=$format ${disablecustomcompress} $db | $GZIP $GZIP_OPTS > '$backupdir/${db}.${dumpext}.gz'"
      else
         dumpcmd="$PGSQLDUMP --format=$format ${disablecustomcompress} $db > '$backupdir/${db}.${dumpext}'"
      fi
      if [ $usevserver = yes ]; then
         execstr="$VSERVER $vsname exec su - $PGSQLUSER -s /bin/bash -c \"$dumpcmd\""
      else
         execstr="su - $PGSQLUSER -s /bin/bash -c \"$dumpcmd\""
      fi
      debug "$execstr"
      if [ ! $test ]; then
         output=`eval $execstr 2>&1`
         code=$?
         if [ "$code" == "0" ]; then
            debug $output
            info "Successfully finished dump of pgsql database ${db}"
         else
            warning $output
            warning "Failed to dump pgsql database ${db}"
         fi
      fi
   done
fi

return 0