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