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#! /bin/bash
# dmgpack volume [file|dir]+
#
# Copy a group of files/directories to a compressed disk image.
# The resulting image is stored in volume.dmg.
#
# Files are copied with 'ditto' to preserve resource forks. For
# convenience we also call FixupResourceForks after copying. This
# allows you to use /Developer/Tools/SplitFork on your tree and
# manipulate it with CVS, tar, etc. Don't forget the -kb option
# when adding or committing app and ._app files to CVS!
#
# This command will fail if a volume of the given name is already
# mounted. It could also fail if the size of the resource forks
# is large compared to the size of the data forks. Change the
# scale factor internally from 11/10 to a more appropriate number
# if it complains it is running out of space.
#
# It is possible to add a license agreement to a dmg file. See
# the "Software License Agreements for UDIFs" sdk available at
# http://developer.apple.com/sdk/index.html
test $# -lt 2 && echo "usage: $0 diskname [file|dir]+" && exit 1
#set -x
NAME="${1%.dmg}" ; shift
DISK=/tmp/dmgpack$$.dmg
COMPRESSED="$NAME.dmg"
VOLUME="$NAME"
# compute needed image size; scale it by 10%
SIZE=$(du -ck "$@" | tail -1 | sed -e 's/ *total//')
SIZE=$(echo $SIZE*11/10 | bc)
test $SIZE -lt 4200 && SIZE=4200
# create the disk
rm -f $DISK
hdiutil create -size ${SIZE}k $DISK -layout NONE
# create a file system on the disk; last line of output is
# the device on which the disk was attached.
DEVICE=$(hdiutil attach $DISK -nomount | tail -1)
newfs_hfs -v "$VOLUME" $DEVICE
# mount the file system
mkdir $DISK-mount
mount -t hfs $DEVICE $DISK-mount || (echo "mount $DISK-mount failed" && exit 1)
# copy stuff to the disk and fixup resource forks
for f in "$@"; do
f=${f%/} ;# strip trailing /
dest="$DISK-mount/${f##*/}"
ditto -rsrc "$f" "$dest"
test -d "$f" && /System/Library/CoreServices/FixupResourceForks "$dest"
done
# eject the disk
umount $DISK-mount
rmdir $DISK-mount
hdiutil eject $DEVICE
# compress the disk and make it read only
rm -f "$COMPRESSED"
hdiutil convert -format UDZO $DISK -imagekey zlib-level=9 -o "$COMPRESSED"
rm -f $DISK
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