compressincomingbackup

#!/bin/sh
#
# Make a local compressed copy of a backup file, typically being delivered by SSH
#
# Consider:
# xfsdump -l0 -M "$BACKUPNAME" -L "fullbackup" - /home | ssh $REMOTE "compressincomingbackup $BACKUPNAME"
#
# Copyright 2022 Michael T. Babcock
# Licensed to use freely under LGPL or MIT at user's discretion

STORAGE="/var/backups"
TARGET="$STORAGE/$1.xd.xz"
LOGFILE="$STORAGE/transfer-`date +%Y%m%d%H%M%S.log`"

# How much data to buffer between network traffic and compression
BUFFER="128M"
# How many cores to use for compression
CPU=4

if [ "x$1" = "x" ]; then
    echo "Specify filename on command-line"
    exit 1
fi

echo "Starting backup to $TARGET:" | tee $LOGFILE

bfr -v -p -b$BUFFER - 2>>$LOGFILE \
    | nice -n10 \
      xz -4 -T$CPU -c - > $TARGET
SUCCESS=$?

echo "."
echo "Done backup (returned: $SUCCESS) -- verifying:" | tee -a $LOGFILE
nice -n10 xz -tv $TARGET 2>&1 | tee -a $LOGFILE
echo "Verify returned $?" | tee -a $LOGFILE