#! /bin/bash
#
# nextcloud.sh
# Backup script for Nextcloud. 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/{{ nextcloud.url }}"
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: $OUTDIR"
		return 2
	fi
fi
# Enforce permissions on our output directory
chown root. "$OUTDIR"
chmod 770 "$OUTDIR"

# Purge oldest backup if we need to
currentbackupcount="$(ls -1 "$OUTDIR" | wc -l)"
# Multiplying by three here because our backups are three-parters
if (( currentbackupcount >= retention * 3 )); then
	lastbackup="$(find "$OUTDIR" -name \*.tar.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
if cd "{{ nextcloud_webroot }}"; then
	date="$(date -Iseconds)"
{% if aws.backup_bucket is defined %}
	# We have an AWS bucket to back straight up to
	log "Piping data backup straight to S3"
	tar czh "/var/nextcloud" --exclude "/var/nextcloud/*/files_trashbin" | aws s3 cp - "s3://{{ aws.backup_bucket }}/{{ nextcloud.url }}/{{ nextcloud.url }}-$date-data.tar.gz" --storage-class STANDARD
{% else %}
	log "Creating data backup"
	tar czhf "$OUTDIR/{{ nextcloud.url }}-$date-data.tar.gz" "/var/nextcloud" --exclude "/var/nextcloud/*/files_trashbin"
{% endif %}
	log "Creating webroot backup"
	tar czf "$OUTDIR/{{ nextcloud.url }}-$date-webroot.tar.gz" "{{ nextcloud_webroot }}"
else
	log "Could not change directory: $OUTDIR"
	return 3
fi