#!/bin/sh

# Create a compressed ramdisk file, based on the directory $DREF.
# This script no longer has to be run as root, thanks to genext2fs.
# I _still_ like scripts that are short and legible.
#
#   Note: genext2fs as provided here is limited to 8 MByte file systems.
#   See http://home.attbi.com/~vr_sundar/genext2fs.html
#   for patches designed to remove that restriction.

# Larry Doolittle   <LRDoolittle@lbl.gov>  January 2002

DREF=$1

# configuration:

RDSIZE=4096             # RAM disk size in units of kBytes
FILE=rdisk              # final output is $FILE.gz
PATH=$PREFIX/bin:$PATH  # may help find genext2fs

# No more configuration should be needed below.
# Proofread at will.

set -e

if [ ! -n "$DREF" -o ! -d "$DREF" ]; then
    echo "$DREF is not a directory; check $0 configuration"
    exit 1
fi

# sanity check only, isn't precise
QSIZE=`du -s $DREF | awk '{print $1}'`
if [ $QSIZE -ge $RDSIZE ]; then
    echo "$REF size $QSIZE too big for ramdisk size $RDSIZE"
    exit 1
fi

sh $PWD/write_devs >dev_arm.txt
genext2fs -i 2048 -b $RDSIZE -d $DREF -f dev_arm.txt >$FILE

# Lost the capability to have non-root files, now that we use genext2fs.
# To regain this feature, either add features to genext2fs, or put
# some chown commands into the boot scripts.
# chown -R 100:100 $MNT/home/mortal
# chmod -R g-w $MNT/home/mortal

# Size reporting would also be a nice feature to add to genext2fs
# df $LOOP

echo "gzipping $FILE"
gzip -v -f -9 $FILE
echo "Compressed filesystem $FILE.gz complete, ready for tftp!"