freebsd-skq/release/scripts/split-file.sh
John Baldwin 18e5e37daa Add a script to split a single file up into chunks using split along with
a list file suitable for use with libstand's splitfs filesystem.  The first
chunk of the file is 16k and has an extension of '.boot' and is meant to be
placed on the boot floppy.  This is required because the current
implementations of gzipfs and bzipfs in libstand want to read in the header
of the file each time it is opened.
2004-01-26 19:45:09 +00:00

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#!/bin/sh
#
# $FreeBSD$
#
# Bail if things fail and be verbose about what we are doing
set -ex
# Arguments are as follows: file destdir chunksize description
FILE=$1; shift
DEST=$1; shift
CHUNK_SIZE=$1; shift
DESCR=$1; shift
# Make sure we can read the file.
[ -r ${FILE} ]
# Create clean working area to stick file chunks and list in
rm -rf ${DEST} || true
mkdir -p ${DEST}
# Split the file into pieces
prefix=`basename $FILE`
dd if=${FILE} bs=16k iseek=1 | split -b ${CHUNK_SIZE}k - ${DEST}/${prefix}.
# Create a special file for the first 16k that gets stuck on the boot
# floppy
files=`ls ${DEST}/${prefix}.*`
first=`echo "${files}" | head -1`
bootchunk="${DEST}/${prefix}.boot"
dd if=${FILE} of=${bootchunk} bs=16k count=1
# Create the split index file
echo `basename ${bootchunk}` "\"Boot floppy\"" > ${DEST}/${prefix}.split
i=1
for file in ${files}; do
echo `basename ${file}` "\"${DESCR} floppy ${i}\"" >> ${DEST}/${prefix}.split
i=$((i + 1))
done