Created
October 23, 2013 04:35
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rpm2cpio written in shell (i.e., tiny with no dependencies) https://trac.macports.org/attachment/ticket/33444/rpm2cpio
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#!/bin/sh | |
pkg=$1 | |
if [ "$pkg" = "" -o ! -e "$pkg" ]; then | |
echo "no package supplied" 1>&2 | |
exit 1 | |
fi | |
leadsize=96 | |
o=`expr $leadsize + 8` | |
set `od -j $o -N 8 -t u1 $pkg` | |
il=`expr 256 \* \( 256 \* \( 256 \* $2 + $3 \) + $4 \) + $5` | |
dl=`expr 256 \* \( 256 \* \( 256 \* $6 + $7 \) + $8 \) + $9` | |
# echo "sig il: $il dl: $dl" | |
sigsize=`expr 8 + 16 \* $il + $dl` | |
o=`expr $o + $sigsize + \( 8 - \( $sigsize \% 8 \) \) \% 8 + 8` | |
set `od -j $o -N 8 -t u1 $pkg` | |
il=`expr 256 \* \( 256 \* \( 256 \* $2 + $3 \) + $4 \) + $5` | |
dl=`expr 256 \* \( 256 \* \( 256 \* $6 + $7 \) + $8 \) + $9` | |
# echo "hdr il: $il dl: $dl" | |
hdrsize=`expr 8 + 16 \* $il + $dl` | |
o=`expr $o + $hdrsize` | |
EXTRACTOR="dd if=$pkg ibs=$o skip=1" | |
COMPRESSION=`($EXTRACTOR |file -) 2>/dev/null` | |
if echo $COMPRESSION | grep -q gzip; then | |
DECOMPRESSOR=gunzip | |
elif echo $COMPRESSION | grep -q bzip2; then | |
DECOMPRESSOR=bunzip2 | |
elif echo $COMPRESSION | grep -q xz; then | |
DECOMPRESSOR=unxz | |
elif echo $COMPRESSION | grep -q cpio; then | |
DECOMPRESSOR=cat | |
else | |
# Most versions of file don't support LZMA, therefore we assume | |
# anything not detected is LZMA | |
DECOMPRESSOR=`which unlzma 2>/dev/null` | |
case "$DECOMPRESSOR" in | |
/* ) | |
;; | |
* ) | |
DECOMPRESSOR=`which lzmash 2>/dev/null` | |
case "$DECOMPRESSOR" in | |
/* ) | |
DECOMPRESSOR="lzmash -d -c" | |
;; | |
* ) | |
DECOMPRESSOR=cat | |
;; | |
esac | |
;; | |
esac | |
fi | |
$EXTRACTOR 2>/dev/null | $DECOMPRESSOR |
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