#!/bin/sh
# img-lib.sh: utilities for dealing with archives and filesystem images.
#
-# TODO: identify/unpack rpm, deb?
+# TODO: identify/unpack rpm, deb, maybe others?
# super-simple "file" that only identifies archives.
# works with stdin if $1 is not set.
det_archive() {
+ # NOTE: echo -e works in ash and bash, but not dash
local bz="BZh" xz="$(echo -e '\xfd7zXZ')" gz="$(echo -e '\x1f\x8b')"
local headerblock="$(dd ${1:+if=$1} bs=262 count=1 2>/dev/null)"
case "$headerblock" in
local img="$1" outdir="$2" archiver="" decompr=""
local ft="$(det_archive $img)"
case "$ft" in
- xz|gzip|bzip2) decompr="$decompr -dc" ;;
+ xz|gzip|bzip2) decompr="$ft -dc" ;;
cpio|tar) decompr="cat";;
*) return 1 ;;
esac
[ -r "$img" ] || { warn "can't read img!"; return 1; }
[ -n "$outdir" ] || { warn "unpack_img: no output dir given"; return 1; }
- if [ "$(det_img $img)" ]; then
+ if [ "$(det_archive $img)" ]; then
unpack_archive "$@" || { warn "can't unpack archive file!"; return 1; }
else
unpack_fs "$@" || { warn "can't unpack filesystem image!"; return 1; }