name : vmlinuz-get-version #!/bin/sh # ---------------------------------------------------------------------- # This file was taken from the Linux kernel source tree (scripts/extract-vmlinux) # and has been adopted for the use within needrestart. # # extract-vmlinux - Extract uncompressed vmlinux from a kernel image # # Inspired from extract-ikconfig # (c) 2009,2010 Dick Streefland <dick@streefland.net> # # (c) 2011 Corentin Chary <corentin.chary@gmail.com> # # Adopted for needrestart # (c) 2016 - 2017 Thomas Liske <liske@ibh.de> # # Licensed under the GNU General Public License, version 2 (GPLv2). # ---------------------------------------------------------------------- get_version() { # search and output version string pattern grep -aom 1 'Linux version [0123456789].*' "$1" && exit 0 } try_decompress() { # The obscure use of the "tr" filter is to work around older versions of # "grep" that report the byte offset of the line instead of the pattern. # Try to find the header ($1) and decompress from here for pos in $(tr "$1\n$2" "\n$2=" < "$img" | grep -abo "^$2"); do pos=${pos%%:*} tail -c+$pos "$img" | $3 > $tmp 2>/dev/null get_version $tmp done } # Check invocation: me=${0##*/} img=$1 if [ $# -lt 1 ] || [ $# -gt 2 ] || [ ! -s "$img" ]; then echo "Usage: $me <kernel-image> [debug]" >&2 exit 2 fi if [ "$2" = "1" ]; then set -x fi # Prepare temp files: tmp=$(mktemp) trap "rm -f $tmp" 0 # Initial attempt for uncompressed images or objects: get_version $img # That didn't work, so retry after decompression. which gunzip > /dev/null && try_decompress '\037\213\010' xy gunzip which unxz > /dev/null && try_decompress '\3757zXZ\000' abcde unxz which bunzip2 > /dev/null && try_decompress 'BZh' xy bunzip2 which unlzma > /dev/null && try_decompress '\135\0\0\0' xxx unlzma which lzop > /dev/null && try_decompress '\211\114\132' xy 'lzop -d'