#! /bin/bash
#
# psql.sh
# Backup script for PostgreSQL. Meant to be sourced by our main backup script
# Copyright (C) 2020 Vintage Salt <rehashedsalt@cock.li>
#
# Distributed under terms of the MIT license.
#

set -e

export OUTDIR="$BACKUPSDIR/psql"
retention=5 # 5-day retention period

# Sanity checks
if [ -z "$BACKUPSDIR" ]; then
	log "BACKUPSDIR was undefined. Run the main backup script instead of this one."
	return 1
fi
if ! [ -d "$OUTDIR" ]; then
	if ! mkdir "$OUTDIR"; then
		log "Unable to find or create output directory: $OUTDIR"
		return 2
	fi
fi
# Enforce permissions on our output directory since the git user will need them
chown root. "$OUTDIR"
chmod 770 "$OUTDIR"

# Purge oldest backup if we need to
currentbackupcount="$(ls -1 "$OUTDIR" | wc -l)"
if (( currentbackupcount >= retention )); then
	lastbackup="$(find "$OUTDIR" -name \*.pgdump.gz 2>/dev/null | sort | head -n 1)"
	lastbackup="${lastbackup%-*.gz}"
	if [ -f "$file" ]; then
		log "Removing old backups for: $lastbackup"
		for file in "$lastbackup"*; do
			log "Removing old backup part: $file"
			rm "$file"
		done
	fi
fi
# WE MAKE BACKUP NOW SERGEI
date="$(date -Iseconds)"
log "Creating DB backup"
sudo -Hu postgres pg_dumpall | gzip > "$OUTDIR/pgdumpall-$date.pgdump.gz"