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ScoDoc/misc/backup_db

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#!/bin/bash
# usage: backup_db dbname
# Dump une base postgresql, et garde plusieurs dumps dans le passe
# Les dumps sont compresses (gzip).
#
# E. Viennet pour ScoDoc, 2005-2011
# Note: pour restaurer un backup (en supprimant la base existante !!!)
# 1- supprimer la base existante si elle existe (dropdb)
# 2- recreer la base, vide: createdb -E UTF-8 NOMDELABASE
# 3- pg_restore --create -d SCOINFO SCOINFO_pgdump
# Nombre de copies a conserver dans le passe:
NUMBACK=500
DBNAME=$1
DUMPBASE=BACKUP-"$DBNAME"
DUMPFILE="$DUMPBASE"/"$DBNAME"_pgdump
function remove_leadings_zeros {
n=$1
if [ $n = "0000" ]; then
echo 0
else
while [ "${n:0:1}" = '0' ]; do
n=${n:1}
done
echo $n
fi
}
# Check if base pathname for backups exist
if [ ! -e ${DUMPBASE} ]; then
mkdir ${DUMPBASE}
fi
# 1- rotate previous dumps
if [ -e ${DUMPFILE}.gz ]
then
LIST=$(ls -r1 ${DUMPFILE}*)
fi
for i in $LIST; do
x=${i#*.}
num=${x%.*} # just the number
num=$(remove_leadings_zeros $num)
if [ "$i" != "$DUMPFILE".gz ]; then
if [ $num -lt $NUMBACK ]; then
# rename file
base=${i%%.*}
ni=$(($num+1))
mv $i "$base".$(printf "%04d" $ni).gz
else
# remove file
rm $i
fi
fi
done
# rename last dump to .0000
if [ -e "$DUMPFILE".gz ]
then
mv "$DUMPFILE".gz "$DUMPFILE.0000.gz"
fi
# 2- dump
#pg_dump "$DBNAME" > $DUMPFILE
pg_dump --format=t "$DBNAME" -f $DUMPFILE
gzip $DUMPFILE