metaclone

#! /bin/sh

# Exit if any command fails
set -e

# 2012-10-03 05:51:23
# a script to create a meta copy of the required directory

src="$1"
test -z "$src" -o "${src:0:1}" != "/" && echo "Usage is: `basename $0` directory_full_path" && exit
test "$(ls "$src")" = "$(ls /)" && echo "I will not clone the root folder, sorry"  && exit

test ! -d "$src" && "'$src' is not a valid directory"
cd "$src"

tempdir=$(mktemp -d)
basedir=$(basename "$src")
dst=$tempdir/$basedir
mkdir "$dst"

mdsync()
{
	touch --reference="$1" "$2"
	chown --reference="$1" "$2"
	chmod --reference="$1" "$2"
}

echo "Creating directories ..."
find . -depth -type d -exec mkdir -p "$dst"/\{\} \;

echo "Cloning files ..."
find . -type f | while read filename; do
	test -f "$dst/$filename" && echo "$dst/$filename already exists. This should have never happened. Bailing out!" && exit 100
	fsize=`stat -c '%s' "$filename"`

	if [ $fsize -gt 0 ]; then
		fallocate -o $((fsize-1)) -l 1 "$dst/$filename" || exit
	fi

	mdsync "$filename" "$dst/$filename"
done

echo "Cloning directories dates/owners/accesses ..."
find . -depth -type d | while read filename; do
	mdsync "$filename" "$dst/$filename"
done

echo "All done"

cd "$tempdir"

test -f "$basedir.tar" && echo "$basedir.tar already exists. This should have never happened. Bailing out!" && exit 100
tar -Scf "$basedir.tar" "$basedir"
echo
echo "The resulting file can be located at $tempdir/$basedir.tar"
echo "$tempdir/$basedir can be safely deleted"