backup-generic

#!/usr/bin/env bash

set -e

src_root=$1
src=$2
archive=$3

echo "Ensuring backup directory structure..."
mkdir -p $(dirname $archive)

echo "Creating archive $archive from file $src in dir $src_root..."

# --alter=atime: Don't let dar mess with atimes (default)
# --empty-dir (-D): Store excluded dirs as empty dirs
# --fs-root (-R): Root directory to archive
# --noconf: Do not try to read ~/.darrc or /etc/darrc conf files
# --create: Create archive at this path
# --slice: Slice archive at this size
# --prune (-P): Drop these paths from the archive
# --go-into (-g): Only these paths from the archive
# --key (-K): Encryption algo & key
time dar \
    --verbose=messages \
    --verbose=finished \
    --execute "par2 c -r10 \"%p/%b.%n.par2\" \"%p/%b.%n.%e\"" \
    --alter=atime \
    --fs-root $src_root \
    --noconf \
    --create $archive \
    --slice 200M \
    --hash sha512 \
    -K aes: \
    -g $src

echo ""
echo "Clearing buffers"
sync
echo 3 > /proc/sys/vm/drop_caches
sleep 4;
 
echo "Checking archive hash..."
# Note this won't work for multiple slices...
(cd $archive_dir && sha512sum -c $archive.1.dar.sha512)

echo "Testing archive..."
dar -K aes: -t $archive

echo "Clearing buffers"
sync
echo 3 > /proc/sys/vm/drop_caches
sleep 4;

echo "Diffing archive and original..."
dar -K aes: -d $archive -R $src_root

echo "Clearing buffers"
sync
echo 3 > /proc/sys/vm/drop_caches
sleep 4;