#!/bin/bash
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# dependencies
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function check-postgresql-deps {
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if [ ! -e /usr/bin/psql ]; then
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debug "It seems that you dont have psql installed. You may have problems to backup remote databases"
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fi
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numberRegex='^[0-9]+$'
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if ! [[ $(id -u postgres 2>&1) =~ $numberRegex ]] ; then
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debug "It seems that you dont have the user postgres on your computer. You may have problems to backup local postgres databases"
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fi
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}
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# PostgreSQL local
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function pg_local_all {
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# Debugoutput id DEBUG is enabled
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debug "Dump all from Postgres local"
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# Dump all databases in one file as user postgres (Debian)
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sudo -H -i -u postgres pg_dumpall > "$TMP_DIR"/local_dumpall.pgsql
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debug "Diff alldumps from Postgres local"
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# Check if there are differences between the actual dump and the last dump
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backup_file_handler "$TMP_DIR $BACKUP_DIR" local_dumpall.pgsql
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}
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function pg_local_single {
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# Get a list with all databases on localhost. Do it as user postgres (Debian)
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# parallelize the following
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for DB in $(sudo -H -i -u postgres /usr/bin/psql -At -c "SELECT datname FROM pg_database WHERE NOT datistemplate AND datallowconn ORDER BY datname;" postgres)
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do
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debug "Dumping local database $DB"
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# Dump each database in a single file
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sudo -H -i -u postgres /usr/bin/pg_dump -Fp "$DB" > "$TMP_DIR"/local_"$DB".pgsql
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backup_file_handler "$TMP_DIR" "$BACKUP_DIR" local_"$DB".pgsql
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echo ""
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done
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}
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# Do the local backupjobs
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function run_local_pg_backups {
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# Test if the current backupuser has access via sudo to postgres
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# This part has to be improved!
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sudo -l -U "$BACKUPUSER" | grep postgres
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if [ $? -eq 0 ];then
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# If the user has access vi sudo to postgres and a full dump is configured, do it.
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if [ "$POSTGRES_BACKUP_LOCAL_DUMP_ALL" == "TRUE" ]; then
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pg_local_all
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fi
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# If the user has access vi sudo to postgres and dumps for each database is configured , do it.
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if [ "$POSTGRES_BACKUP_LOCAL_SINGLE" == "TRUE" ]; then
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pg_local_single
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fi
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else
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# If the user is not permitted to acces the postgresdatabases vi sudo throw an errormessage
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echo "" | $LOGGER
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echo "The backupuser does not the permission to act as user postgres" | $LOGGER
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echo "Please add the following line to your /etc/sudoers:" | $LOGGER
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echo "backupuser ALL=(postgres) NOPASSWD: /usr/bin/psql,/usr/bin/pg_dump" | $LOGGER
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echo "" | $LOGGER
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fi
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}
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################################################################################
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# Postgres remote
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#
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# All databases on remotehosts defined in the ~/.pgpass file will be backuped.
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# So the ~/.pgpass is the configurationfile for this part!
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function dump_remote_pgdb {
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# Translate params ;-)
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TRGTHOST=$1
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TRGTPORT=$2
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TRGTDB=$3
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TRGTBDUSER=$4
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# If debug is enabled, check the translated params
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debug "PostgreSQL:"
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debug " Host: $TRGTHOST"
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debug " Port: $TRGTPORT"
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debug " Database: $TRGTDB"
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debug " User: $TRGTBDUSER"
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debug "Testing TLS-Connection"
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# Check if the connection to the postgres-server are encryptet (here we force with sslmode=require)
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psql -U "$TRGTBDUSER" postgresql://"$TRGTHOST":"$TRGTPORT"/"$TRGTDB"?sslmode=require -c '\conninfo' | grep TLS > /dev/null 2>&1
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if [ "$?" -eq "0" ]; then
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debug "Dumping remote database $TRGTHOST-$TRGTDB"
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# If we successfuly testet the encrypted connection to the postgres-server we try to force the sslmode
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# I don't know if the following statement really effect to pg_dump :-(
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export PGSSLMODE=require
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# Dump the databases which are defined in the params
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/usr/bin/pg_dump -U "$TRGTBDUSER" -h "$TRGTHOST" -p "$TRGTPORT" "$TRGTDB" > "$TMP_DIR"/"$TRGTHOST"-"$TRGTDB".pgql
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backup_file_handler "$TMP_DIR" "$BACKUP_DIR" "$TRGTHOST"-"$TRGTDB".pgql
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else
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# If no encrypted connection to the postgres-server can be established throw an errormessage
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echo "" | $LOGGER
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echo "Could not establish a TLS encrypted connection the the databasehost." | $LOGGER
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echo "Please configure the connections with hostssl in pg_hba.conf." | $LOGGER
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echo "" | $LOGGER
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fi
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echo ""
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}
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function run_remote_pg_backups {
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# Check if the remoebackup for postgres is configured
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if [ "$POSTGRES_BACKUP_REMOTE" = "TRUE" ]; then
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# If yes the check for the ~/.pgpass-file. Here are the remotedatabases specified
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if [ -r ~/.pgpass ]; then
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# parallelize the following
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while read -r LINE; do
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# For each entry do the backup
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debug "run dump with params $LINE"
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# CAUTION: No doublequotes in the following line. The var $LINE has to be splittet!
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dump_remote_pgdb $LINE
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# To get the params for the function the .pgpass-file is striped from the comments,
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# the ":" are replaces against whitespaces and only the first four coloums are used
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# so we give "host port database user" to the function
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done <<< "$(cat ~/.pgpass | grep -v '#' | tr ":" " " | cut -d " " -f1,2,3,4)"
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else
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# If the ~/.pgpass-file is missig, throw an errormessage
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echo "" | $LOGGER
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echo "The ~/.pgpass file is missing, no remote postgres databases will be backuped." | $LOGGER
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echo "If you want do backup postgres reomte databases, please create a ~/.pgpass file in the homedirectory of your backupuser (https://wiki.postgresql.org/wiki/Pgpass)." | $LOGGER
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echo "" | $LOGGER
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fi
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fi
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echo ""
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}
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function postgresql-main {
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if [ "$POSTGRES_BACKUP_LOCAL" = "TRUE" ]; then
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run_local_pg_backups
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fi
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if [ "$POSTGRES_BACKUP_REMOTE" = "TRUE" ]; then
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run_remote_pg_backups
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fi
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}
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