simple2farm

#!/bin/bash

# This script is used to translate simple store backend into Farm.
# Usage: simple2farm /path/to/store/obj

set -e

E_BADARGS=65

if [ $# -ne 1 ]; then
	echo "Usage: `basename $0` /path/to/store/obj"
	exit $E_BADARGS
fi

if [ `basename $1` != "obj" ]; then
	echo "You should specify path to store/obj"
	exit $E_BADARGS
fi

if [ "$(pgrep sheep)" ]; then
	echo "You need to shutdown cluster first"
	exit 1
fi

cd $1

config_offset=11
# Get the backend store from config file
echo "Read config file"
store=$(od --skip-bytes=$config_offset -An -c ../config | sed 's/ //g' | sed 's/\\0//g')
if [ "x$store" == "xfarm" ]; then
	echo "It's already the farm store, we'er done"
	exit 0
fi

# find the highest numbered directory, remove older ones
max=00000001
for i in *; do
	if [ $i -gt $max ]; then
		rm -rf $max
		max=$i
	fi
done

echo "Find the highest numbered directory $max"
echo "Try to move the objects..."
mv $max/* .
rmdir $max
echo "Update config file"
echo -en 'farm\0' | dd of=../config seek=$config_offset bs=1 2> /dev/null
echo "Now simple store has been tranformed into Farm"