#!/bin/sh

BASE="/services"
SERVICES=$(ls $BASE)

echo "#### STARTING NEW BACKUP OF ALL SERVICES ####"
echo ""
echo "     SERVICES IN TRACKER:"
for SERVICE in $SERVICES; do
	echo "   - ${SERVICE}"
done
echo ""
echo "     BACKUP STARTED ON $(date)"
echo ""
echo ""
echo ""

for SERVICE in $SERVICES; do
	LOCAL="$BASE/$SERVICE"

	# Skip service if it doesn't have an backup config specified
	if [ ! -f "$LOCAL/backup.conf" ]; then
		continue
	fi

	RETAIN="1M"
	INCREMENT="1W"
	INTERVAL="1H"

	# Read config for extra options
	while IFS='=' read -r key val; do
		[ "${key##\#\#*}" ] || continue # Skip if line starts with two hash signs
		[ ! "${key##\#*}" ] || continue # Skip if line doesn't start with a hash sign
		key="${key##\#}" # Strip the hash sign

		# Key isn't escaped so the space after the hash sign gets consumed 
		# by the assignment. This way the space is optional
		export $key="$val" 2>/dev/null ||
			printf '     warning %s is not a valid variable name\n' "$key"
	done < "$LOCAL/backup.conf"                                                           

	echo "==== BACKING UP $SERVICE ===="
	echo ""
	echo "     Retaining backups for $RETAIN"
	echo "     Maxiumum incremental backup duration is $INCREMENT"
	echo "     Running every $INTERVAL"
	echo ""

	INTERVAL_INT=1
	case $INTERVAL in
		*M) INTERVAL_INT=$(( ${INTERVAL%%M} * 24 * 61 / 2 ));;
		*W) INTERVAL_INT=$(( ${INTERVAL%%W} * 24 * 7 ));;       
		*D) INTERVAL_INT=$(( ${INTERVAL%%D} * 24 ));;          
		*H) INTERVAL_INT=$(( ${INTERVAL%%H} ));;           
		*)  INTERVAL_INT=1;;                      
	esac
						   
	if [ $(( ( $(date +%s) / 3600 ) % $INTERVAL_INT )) -ne 0 ]; then
		echo "==== SKIPPING $SERVICE"
		echo "     Service not yet scheduled for backup."
		echo ""
		echo ""
		echo ""
		echo ""
		echo ""
		continue
	fi

	echo ""

	while read REMOTE; do
		# Skip if line is empty
		[ -z "$REMOTE" ] && continue

		REMOTE="$REMOTE/$SERVICE"
		TYPE=$(echo "$REMOTE" | cut -d \: -f 1)
		SERVER=$(echo "$REMOTE" | cut -d \: -f 3 | cut -d \@ -f 2 | cut -d \/ -f 1)

		echo "==== USING REMOTE:"
		echo "     $SERVER over $TYPE"
		echo ""

		echo "   > BACKUP"
		duplicity \
			--verbosity 2 \
			--no-encryption \
			--allow-source-mismatch \
			--full-if-older-than "$INCREMENT" \
			--include-filelist "$LOCAL/backup.conf" \
			"$LOCAL" "$REMOTE" \
			2>&1 | sed 's/^/     /'
		
		echo "   > DELETE OLD"
		duplicity \
			--verbosity 2 \
			remove-older-than "$RETAIN" \
			--no-encryption \
			--allow-source-mismatch \
			--include-filelist "$LOCAL/backup.conf" \
			--force \
			"$REMOTE" \
			2>&1 | sed 's/^/     /'
		
		echo ""
		echo "   > VERIFY"
		duplicity \
			verify \
			--verbosity 2 \
			--no-encryption \
			--allow-source-mismatch \
			--include-filelist "$LOCAL/backup.conf" \
			"$REMOTE" "$LOCAL" \
			2>&1 | sed 's/^/     /'
		
		if [ $? -ne 0 ]; then
			echo " [!] SOMETHING BAD HAPPENED"
			echo "     Backups where made but don't check out. Is the remote's storage full?"
		fi

		echo ""
		echo ""
	done < "/data/services.conf"
	echo ""
	echo ""
	echo ""

done

echo "#### BACKUP FINISHED ####"
echo ""
echo "     ENDED ON $(date)"
echo ""
echo ""
echo ""
echo ""
echo ""
echo ""
echo ""
echo ""
echo ""