#!/bin/bash
#
#versioned-backup-1.0.sh
#
#Backup im Netz mit Hilfe von rsync
#
NOW="$(date '+%Y%m%d-%H%M')"
MYNAME="$(hostname)"
LDIR="/home"
LDIR1="/etc"

BNAME="pve.srv.lcd"
BIP="192.168.1.201"
BUSER="root"
BDIR="/backup"

# Verbindung testen
/bin/ping -c 1 "$BIP" >/dev/null 2>&1
if [ $? -ne 0 ]; then
	echo "BACKUP-Server ist leider nicht erreichbar."
	exit 2
fi

# Teste, ob das richtige BACKUP-Rechner ist
BNAMETEST=$(ssh "$BUSER@$BIP" hostname)
if [ "$BNAMETEST" != "$BNAME" ]; then
	echo "Fehler: Verbindung mit falschem Server." # Zwischenmeldung
	exit
fi

REMOTE_DIR_COUNT=$(ssh "$BUSER@$BIP" "ls -d "$BDIR/$MYNAME/20??????-????" 2>/dev/null | wc -l")
if [ "$REMOTE_DIR_COUNT" -eq 0 ]; then
	ssh "$BUSER@$BIP" "mkdir -p "/"$BDIR"/"$MYNAME"/"$NOW"
fi

LAST_REMOTE_DIR=$(ssh "$BUSER@$BIP" ls -d "$BDIR/$MYNAME/20*-*" | sort | tail -1)

OLDEST_REMOTE_DIR=$(ssh "$BUSER@$BIP" ls -d "$BDIR/$MYNAME/20*-*" | sort | head -1)

rsync -au --delete --ignore-errors --partial --link-dest=/"$LAST_REMOTE_DIR" "$LDIR" "$LDIR1" "$BUSER@$BIP:$BDIR/$MYNAME/$NOW"

# Maximal 7 Backups behalten
if [ "$(ssh "$BUSER@$BIP" ls -d /"$BDIR"/"$MYNAME"/20*-* |wc -l)" -gt 7 ]; then
	ssh "$BUSER@$BIP" rm -rf "$OLDEST_REMOTE_DIR"
fi