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#!/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 <[email protected]>
#
# (c) 2011 Corentin Chary <[email protected]>
#
# Adopted for needrestart
# (c) 2016 - 2017 Thomas Liske <[email protected]>
#
# 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'