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+#!/bin/bash
+
+# Check if the running kernel has the same version string as the on-disk
+# kernel image.
+
+# Copyright 2008,2009,2011 Peter Palfrader
+# Copyright 2009 Stephen Gran
+# Copyright 2010,2012,2013 Uli Martens
+# Copyright 2011 Alexander Reichle-Schmehl
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+OK=0;
+WARNING=1;
+CRITICAL=2;
+UNKNOWN=3;
+
+get_offset() {
+ local file needle
+
+ file="$1"
+ needle="$2"
+ perl -e '
+ undef $/;
+ $i = index(<>, "'"$needle"'");
+ if ($i < 0) {
+ exit 1;
+ };
+ print $i,"\n"' < "$file"
+}
+
+get_avail() {
+ # This is wrong, but leaves room for when we have to care for machines running
+ # myfirstunix-image-0.1-dsa-arm
+ local prefix="$1"; shift
+
+ local kervers=$(uname -r)
+
+ local metavers=''
+
+ # DSA uses kernel versions of the form 2.6.29.3-dsa-dl380-oldxeon, where
+ # Debian uses versions of the form 2.6.29-2-amd64
+ if [ "${kervers#3}" != "$kervers" ]; then
+ metavers=$(echo $kervers | sed -r -e 's/^3\.[0-9].[0-9]+-[A-Za-z0-9\.]+-(.*)/\1/')
+ elif [ "${kervers//dsa}" != "$kervers" ]; then
+ metavers=$(echo $kervers | sed -r -e 's/^2\.(4|6)\.[0-9]+([\.0-9]+?)-(.*)/2.\1-\3/')
+ else
+ metavers=$(echo $kervers | sed -r -e 's/^2\.(4|6)\.[0-9]+-[A-Za-z0-9\.]+-(.*)/2.\1-\2/')
+ fi
+
+ # Attempt to track back to a metapackage failed. bail
+ if [ "$metavers" = "$kervers" ]; then
+ return 2
+ fi
+
+ # We're just going to give up if we can't find a matching metapackage
+ # I tried being strict once, and it just caused a lot of headaches. We'll see how
+ # being lax does for us
+
+ local output=$(apt-cache policy ${prefix}-image-${metavers} 2>/dev/null)
+ local metaavailvers=$(echo "$output" | grep '^ Candidate:' | awk '{print $2}')
+ local metainstavers=$(echo "$output" | grep '^ Installed:' | awk '{print $2}')
+
+ if [ -z "$metaavailvers" ] || [ "$metaavailvers" = '(none)' ]; then
+ return 2
+ fi
+ if [ -z "$metainstavers" ] || [ "$metainstavers" = '(none)' ]; then
+ return 2
+ fi
+
+ if [ "$metaavailvers" != "$metainstavers" ] ; then
+ echo "${prefix}-image-${metavers} $metaavailvers available but $metainstavers installed"
+ return 1
+ fi
+
+ local imagename=0
+ # --no-all-versions show shows only the candidate
+ for vers in $(apt-cache --no-all-versions show ${prefix}-image-${metavers} | sed -n 's/^Depends: //p' | tr ',' '\n' | tr -d ' ' | grep ${prefix}-image | awk '{print $1}' | sort -u); do
+ if dpkg --compare-versions "1.$vers" gt "1.$imagename"; then
+ imagename=$vers
+ fi
+ done
+
+ if [ -z "$imagename" ] || [ "$imagename" = 0 ]; then
+ return 2
+ fi
+
+ if [ "$imagename" != "${prefix}-image-${kervers}" ]; then
+ if dpkg --compare-versions 1."$imagename" lt 1."${prefix}-image-${kervers}"; then
+ return 2
+ fi
+ echo "$imagename" != "${prefix}-image-${kervers}"
+ return 1
+ fi
+
+ local availvrs=$(apt-cache policy ${imagename} 2>/dev/null | grep '^ Candidate' | awk '{print $2}')
+ local kernelversion=$(apt-cache policy ${prefix}-image-${kervers} 2>/dev/null | grep '^ Installed:' | awk '{print $2}')
+
+ if [ "$availvrs" = "$kernelversion" ]; then
+ return 0
+ fi
+
+ echo "$kernelversion != $availvrs"
+ return 1
+}
+
+cat_vmlinux() {
+ local image header filter hdroff
+
+ image="$1"
+ header="$2"
+ filter="$3"
+ hdroff="$4"
+
+ off=`get_offset "$image" $header`
+ if [ "$?" != 0 ]; then
+ # not found, exit
+ return 1
+ fi
+
+ (dd ibs="$((off+$hdroff))" skip=1 count=0 && dd bs=512k) < "$image" 2>/dev/null | $filter 2>/dev/null
+}
+
+get_image_linux() {
+ local image
+
+ image="$1"
+
+ # gzip compressed image
+ if cat_vmlinux "$image" "\x1f\x8b\x08\x00" "zcat" 0; then return; fi
+ if cat_vmlinux "$image" "\x1f\x8b\x08\x08" "zcat" 0; then return; fi
+ # lzma compressed image
+ if cat_vmlinux "$image" "\x00\x00\x00\x02\xff" "xzcat" -1; then return; fi
+ if cat_vmlinux "$image" "\x00\x00\x00\x04\xff" "xzcat" -1; then return; fi
+ # xz compressed image
+ if cat_vmlinux "$image" "\xfd\x37\x7a\x58\x5a " "xzcat" 0; then return; fi
+
+ echo "ERROR: Unable to extract kernel image." 2>&1
+ exit 1
+}
+
+
+freebsd_check_running_version() {
+ local imagefile="$1"; shift
+
+ local r="$(uname -r)"
+ local v="$(uname -v| sed -e 's/^#[0-9]*/&:/')"
+
+ local q='@\(#\)FreeBSD '"$r $v"
+
+ if zcat "$imagefile" | $STRINGS | egrep -q "$q"; then
+ echo "OK"
+ else
+ echo "not OK"
+ fi
+}
+
+STRINGS="";
+if [ -x "$(which strings)" ]; then
+ STRINGS="$(which strings)"
+elif [ -x "$(which busybox)" -a "$( echo foobar | $(which busybox) strings 2>/dev/null)" = "foobar" ]; then
+ STRINGS="$(which busybox) strings"
+fi
+
+searched=""
+for on_disk in \
+ "/boot/vmlinuz-`uname -r`"\
+ "/boot/vmlinux-`uname -r`"\
+ "/boot/kfreebsd-`uname -r`.gz"; do
+
+ if [ -e "$on_disk" ]; then
+ if [ -z "$STRINGS" ]; then
+ echo "UNKNOWN: 'strings' command missing, perhaps install binutils or busybox?"
+ exit $UNKNOWN
+ fi
+ if [ "${on_disk/vmlinu}" != "$on_disk" ]; then
+ on_disk_version="`get_image_linux "$on_disk" | $STRINGS | grep 'Linux version' | head -n1`"
+ if [ -x /usr/bin/lsb_release ] ; then
+ vendor=$(lsb_release -i -s)
+ if [ -n "$vendor" ] && [ "xDebian" != "x$vendor" ] ; then
+ on_disk_version=$( echo $on_disk_version|sed -e "s/ ($vendor [[:alnum:]\.-]\+ [[:alnum:]\.]\+)//")
+ fi
+ fi
+ [ -z "$on_disk_version" ] || break
+ on_disk_version="`cat "$on_disk" | $STRINGS | grep 'Linux version' | head -n1`"
+ [ -z "$on_disk_version" ] || break
+
+ echo "UNKNOWN: Failed to get a version string from image $on_disk"
+ exit $UNKNOWN
+ else
+ on_disk_version="$(zcat $on_disk | $STRINGS | grep Debian | head -n 1 | sed -e 's/Debian [[:alnum:]]\+ (\(.*\))/\1/')"
+ fi
+ fi
+ searched="$searched $on_disk"
+done
+
+if ! [ -e "$on_disk" ]; then
+ echo "WARNING: Did not find a kernel image (checked$searched) - I have no idea which kernel I am running"
+ exit $WARNING
+fi
+
+if [ "$(uname -s)" = "Linux" ]; then
+ running_version="`cat /proc/version`"
+ if [ -z "$running_version" ] ; then
+ echo "UNKNOWN: Failed to get a version string from running system"
+ exit $UNKNOWN
+ fi
+
+ if [ "$running_version" != "$on_disk_version" ]; then
+ echo "WARNING: Running kernel does not match on-disk kernel image: [$running_version != $on_disk_version]"
+ exit $WARNING
+ fi
+
+ ret="$(get_avail linux)"
+ if [ $? = 1 ]; then
+ echo "WARNING: Kernel needs upgrade [$ret]"
+ exit $WARNING
+ fi
+else
+ image_current=$(freebsd_check_running_version $on_disk)
+ running_version="`uname -s` `uname -r` `uname -v`"
+ if [ "$image_current" != "OK" ]; then
+ approx_time="$(date -d "@`stat -c '%Y' "$on_disk"`" +"%Y-%m-%d %H:%M:%S")"
+ echo "WARNING: Currently running kernel ($running_version) does not match on disk image (~ $approx_time)"
+ exit $WARNING;
+ fi
+
+ ret="$(get_avail linux)"
+ if [ $? = 1 ]; then
+ echo "WARNING: Kernel needs upgrade [$ret]"
+ exit $WARNING
+ fi
+fi
+
+echo "OK: Running kernel matches on disk image: [$running_version]"
+exit $OK