|
| 1 | +#!/bin/sh |
| 2 | +# |
| 3 | +# Make a single-partition FAT16 disk image with the contents of a folder. |
| 4 | +# |
| 5 | +# macOS only, since the DiskImages framework does all the heavy lifting. |
| 6 | +# |
| 7 | + |
| 8 | +function usage() { |
| 9 | + if [ ! -z '$1' ]; then |
| 10 | + echo "\nERROR: $1\n" |
| 11 | + fi |
| 12 | + echo "usage: $0 [-o] [-p <pad MiB> | -s <size MiB>] <output file> <input directory>\n" |
| 13 | + echo " creates a FAT16 disk image in <output file> containing the files in <input directory>" |
| 14 | + echo " -o OK to replace <output file> if it exists" |
| 15 | + echo " -p <pad MiB> add padding to filesystem (min 5MiB)" |
| 16 | + echo " -s <size MiB> set filesystem size (must be large enough for files + 5MiB)" |
| 17 | + exit 1 |
| 18 | +} |
| 19 | + |
| 20 | +overwrite=1 |
| 21 | +padsize=5 |
| 22 | +fixsize=0 |
| 23 | + |
| 24 | +args=`getopt op:s: $*` |
| 25 | +if [ $? != 0 ]; then |
| 26 | + usage "invalid option(s)" |
| 27 | +fi |
| 28 | +set -- $args |
| 29 | +for i; do |
| 30 | + case "$i" in |
| 31 | + -o ) |
| 32 | + overwrite=0 |
| 33 | + shift;; |
| 34 | + -p ) |
| 35 | + padsize=$2 |
| 36 | + shift; shift;; |
| 37 | + -s ) |
| 38 | + fixsize=$2 |
| 39 | + shift; shift;; |
| 40 | + -- ) |
| 41 | + shift; break;; |
| 42 | + esac |
| 43 | +done |
| 44 | + |
| 45 | +if [ ! $# -eq 2 ]; then |
| 46 | + usage "missing argument(s)" |
| 47 | +fi |
| 48 | +if [ -e $1 ]; then |
| 49 | + if [ -f $1 ]; then |
| 50 | + if [ ! $overwrite ]; then |
| 51 | + usage "file $1 already exists" |
| 52 | + fi |
| 53 | + rm -f $1 |
| 54 | + else |
| 55 | + usage "$1 exists and is not a file" |
| 56 | + fi |
| 57 | +fi |
| 58 | +if [ ! -d $2 ]; then |
| 59 | + usage "$2 not a directory or does not exist" |
| 60 | +fi |
| 61 | + |
| 62 | +dirsize=`du -mLs $2 | cut -f 1` |
| 63 | + |
| 64 | +if [ $fixsize -gt 0 ]; then |
| 65 | + if [ $fixsize -lt $dirsize ]; then |
| 66 | + usage "specified size $fixsize MiB too small, need $dirsize MiB" |
| 67 | + fi |
| 68 | +elif [ $padsize -gt 0 ]; then |
| 69 | + if [ $padsize -lt 5 ]; then |
| 70 | + usage "padding size less than 5 MiB not recommended" |
| 71 | + fi |
| 72 | + fixsize=`expr $dirsize + $padsize` |
| 73 | +else |
| 74 | + usage "must specify a non-zero padding size, or a fixed size" |
| 75 | +fi |
| 76 | + |
| 77 | +echo "creating $fixsize MiB image $1 with contents from $2..." |
| 78 | +hdiutil create -megabytes $fixsize -layout MBRSPUD -fs "MS-DOS FAT16" -format UDIF -srcfolder $2 $1 |
0 commit comments