Some initial BSD support in dsa-check-running-kernel

Still to do:

Write a new function or abstract the apt bit to also look at BSD version
strings correctly, currently far too linux specific.

Figure out how to extract the current running kernel image version from
a BSD kernel.  They seem to lie and just list a made up linux version,
presumably for $stupid_app compatibility.

Signed-off-by: Stephen Gran <steve@lobefin.net>

diff --git a/dsa-nagios-checks/checks/dsa-check-running-kernel b/dsa-nagios-checks/checks/dsa-check-running-kernel
index 0d50b76..78255f7 100755 (executable)
--- a/dsa-nagios-checks/checks/dsa-check-running-kernel
+++ b/dsa-nagios-checks/checks/dsa-check-running-kernel
@@ -45,7 +45,7 @@ get_offset() {
                print $i,"\n"' < "$file"
 }
 
-get_avail() {
+get_avail_linux() {
        # This is wrong, but leaves room for when we have to care for machines running
        # myfirstunix-image-0.1-dsa-arm
        local prefix=linux
@@ -118,7 +118,7 @@ get_avail() {
        return 1
 }
 
-get_image() {
+get_image_linux() {
        local image GZHDR1 GZHDR2 LZHDR off
 
        image="$1"
@@ -155,16 +155,21 @@ get_image() {
 searched=""
 for on_disk in \
        "/boot/vmlinuz-`uname -r`"\
-       "/boot/vmlinux-`uname -r`"; do
+       "/boot/vmlinux-`uname -r`"\
+       "/boot/kfreebsd-`uname -r`.gz"; do
 
        if [ -e "$on_disk" ]; then
-               on_disk_version="`get_image "$on_disk" | strings | grep 'Linux version' | head -n1`"
-               [ -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 $UNKNOWN
+               if [ "${on_disk/vmlinu}" != "$on_disk" ]; then
+                       on_disk_version="`get_image_linux "$on_disk" | strings | grep 'Linux version' | head -n1`"
+                       [ -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 $on_disk"
 done
@@ -174,22 +179,26 @@ if ! [ -e "$on_disk" ]; then
        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
 
-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 $WARNING
-fi
+       if [ "$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)"
-if [ $? = 1 ]; then
-       echo "WARNING: Kernel needs upgrade [$ret]"
-       exit $WARNING
+       ret="$(get_avail_linux)"
+       if [ $? = 1 ]; then
+               echo "WARNING: Kernel needs upgrade [$ret]"
+               exit $WARNING
+       fi
+else
+       echo "No support for FreeBSD yet"
+       exit $OK
 fi
 
 echo "OK: Running kernel matches on disk image: [$running_version]"