#! /bin/bash
#
# desktop.sh
# Backup script for desktops. 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/{{ inventory_hostname }}"
retention=7 # 7-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

# Purge oldest backup if we need to
currentbackupcount="$(ls -1 "$OUTDIR" | wc -l)"
if (( currentbackupcount >= retention )); then
	lastbackup="$(find "$OUTDIR" -name \*.tar.gz 2>/dev/null | sort | head -n 1)"
	if [ -f "$lastbackup" ]; then
		log "Removing old backup: $lastbackup"
		rm "$lastbackup"
	fi
fi
# WE MAKE BACKUP NOW SERGEI
for dir in /home/*; do
	username="$(basename -- "$dir")"
	forcefile="$dir/.backup/force"
	[ -d "$dir/.backup" ] || continue
	for file in "$dir/.backup/"*; do [ -e "$file" ] || continue; done
	tar czhf "$OUTDIR/desktop-$username-{{ inventory_hostname }}-$(date -Iseconds).tar.gz" "$dir/.backup/"*
	if (( "$(date +%d)" == "1" )) || [ -f "$forcefile" ]; then
		log "Detected conditions for monthly dump"
		if command -v aws > /dev/null 2>&1 && aws s3 ls "s3://$s3bucket" > /dev/null 2>&1; then
			# Time for huge backups piped straight to S3
			tar cz \
				--exclude "$dir/.ansible" \
				--exclude "$dir/.backup" \
				--exclude "$dir/.cache" \
				--exclude "$dir/.steam" \
				--exclude "$dir/Downloads" \
				--exclude "$dir/Dropbox" \
				--exclude "$dir/Nextcloud" \
				--exclude "$dir/snap" \
				f - "$dir/"* \
				| aws s3 cp - "s3://$s3bucket" \
				--recursive \
				--only-show-errors \
				--storage-class STANDARD_IA
		else
			log "Could not satisfy requirements for AWS CLI"
		fi
		[ -f "$forcefile" ] && rm "$forcefile"
	fi
done