initial commit
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205
check_kernel
Executable file
205
check_kernel
Executable file
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#!/bin/bash
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# Check if the running kernel has the same version string as the on-disk
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# kernel image.
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# Copyright 2008,2009 Peter Palfrader
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# Copyright 2009 Stephen Gran
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# Copyright 2010 Uli Martens
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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OK=0;
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WARNING=1;
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CRITICAL=2;
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UNKNOWN=3;
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get_offset() {
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local file needle
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file="$1"
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needle="$2"
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perl -e '
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undef $/;
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$i = index(<>, "'"$needle"'");
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if ($i < 0) {
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exit 1;
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};
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print $i,"\n"' < "$file"
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}
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get_avail_linux() {
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# This is wrong, but leaves room for when we have to care for machines running
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# myfirstunix-image-0.1-dsa-arm
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local prefix=linux
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local kervers=$(uname -r)
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local metavers=''
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# DSA uses kernel versions of the form 2.6.29.3-dsa-dl380-oldxeon, where
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# Debian uses versions of the form 2.6.29-2-amd64
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if [ "${kervers//dsa}" != "$kervers" ]; then
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metavers=$(echo $kervers | sed -r -e 's/^2\.(4|6)\.[0-9]+([\.0-9]+?)-(.*)/2.\1-\3/')
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else
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metavers=$(echo $kervers | sed -r -e 's/^2\.(4|6)\.[0-9]+-[A-Za-z0-9\.]+-(.*)/2.\1-\2/')
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fi
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# Attempt to track back to a metapackage failed. bail
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if [ "$metavers" = "$kervers" ]; then
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return 2
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fi
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# We're just going to give up if we can't find a matching metapackage
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# I tried being strict once, and it just caused a lot of headaches. We'll see how
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# being lax does for us
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local output=$(apt-cache policy ${prefix}-image-${metavers} 2>/dev/null)
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local metaavailvers=$(echo "$output" | grep '^ Candidate:' | awk '{print $2}')
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local metainstavers=$(echo "$output" | grep '^ Installed:' | awk '{print $2}')
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if [ -z "$metaavailvers" ] || [ "$metaavailvers" = '(none)' ]; then
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return 2
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fi
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if [ -z "$metainstavers" ] || [ "$metainstavers" = '(none)' ]; then
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return 2
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fi
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if [ "$metaavailvers" != "$metainstavers" ] ; then
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echo "${prefix}-image-${metavers} $metaavailvers available but $metainstavers installed"
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return 1
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fi
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local imagename=0
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# --no-all-versions show shows only the candidate
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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
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if dpkg --compare-versions $vers gt $imagename; then
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imagename=$vers
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fi
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done
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if [ -z "$imagename" ] || [ "$imagename" = 0 ]; then
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return 2
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fi
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if [ "$imagename" != "${prefix}-image-${kervers}" ]; then
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if dpkg --compare-versions "$imagename" lt "${prefix}-image-${kervers}"; then
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return 2
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fi
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echo "$imagename" != "${prefix}-image-${kervers}"
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return 1
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fi
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local availvrs=$(apt-cache policy ${imagename} 2>/dev/null | grep '^ Candidate' | awk '{print $2}')
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local kernelversion=$(apt-cache policy ${prefix}-image-${kervers} 2>/dev/null | grep '^ Installed:' | awk '{print $2}')
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if [ "$availvrs" = "$kernelversion" ]; then
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return 0
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fi
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echo "$kernelversion != $availvrs"
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return 1
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}
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get_image_linux() {
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local image GZHDR1 GZHDR2 LZHDR off
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image="$1"
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GZHDR1="\x1f\x8b\x08\x00"
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GZHDR2="\x1f\x8b\x08\x08"
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LZHDR="\x00\x00\x00\x02\xff"
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off=`get_offset "$image" $GZHDR1`
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[ "$?" != "0" ] && off="-1"
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if [ "$off" -eq "-1" ]; then
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off=`get_offset "$image" $GZHDR2`
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[ "$?" != "0" ] && off="-1"
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fi
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if [ "$off" -eq "0" ]; then
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zcat < "$image"
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return
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elif [ "$off" -ne "-1" ]; then
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(dd ibs="$off" skip=1 count=0 && dd bs=512k) < "$image" 2>/dev/null | zcat 2>/dev/null
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return
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fi
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off=`get_offset "$image" $LZHDR`
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[ "$?" != "0" ] && off="-1"
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if [ "$off" -ne "-1" ]; then
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(dd ibs="$[off-1]" skip=1 count=0 && dd bs=512k) < "$image" 2>/dev/null | lzcat 2>/dev/null
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return
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fi
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echo "ERROR: Unable to extract kernel image." 2>&1
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exit 1
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}
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searched=""
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for on_disk in \
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"/boot/vmlinuz-`uname -r`"\
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"/boot/vmlinux-`uname -r`"\
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"/boot/kfreebsd-`uname -r`.gz"; do
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if [ -e "$on_disk" ]; then
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if [ "${on_disk/vmlinu}" != "$on_disk" ]; then
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on_disk_version="`get_image_linux "$on_disk" | strings | grep 'Linux version' | head -n1`"
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[ -z "$on_disk_version" ] || break
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on_disk_version="`cat "$on_disk" | strings | grep 'Linux version' | head -n1`"
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[ -z "$on_disk_version" ] || break
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echo "UNKNOWN: Failed to get a version string from image $on_disk"
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exit $UNKNOWN
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else
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on_disk_version="$(zcat $on_disk | strings | grep Debian | head -n 1 | sed -e 's/Debian [[:alnum:]]\+ (\(.*\))/\1/')"
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fi
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fi
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searched="$searched $on_disk"
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done
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if ! [ -e "$on_disk" ]; then
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echo "WARNING: Did not find a kernel image (checked$searched) - I have no idea which kernel I am running"
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exit $WARNING
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fi
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if [ "$(uname -s)" = "Linux" ]; then
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running_version="`cat /proc/version`"
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if [ -z "$running_version" ] ; then
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echo "UNKNOWN: Failed to get a version string from running system"
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exit $UNKNOWN
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fi
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if [ "$running_version" != "$on_disk_version" ]; then
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echo "WARNING: Running kernel does not match on-disk kernel image: [$running_version != $on_disk_version]"
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exit $WARNING
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fi
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ret="$(get_avail_linux)"
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if [ $? = 1 ]; then
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echo "WARNING: Kernel needs upgrade [$ret]"
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exit $WARNING
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fi
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else
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echo "No support for FreeBSD yet"
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exit $OK
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fi
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echo "OK: Running kernel matches on disk image: [$running_version]"
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exit $OK
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