if no strings binary found but busybox, use that

Signed-off-by: Martin Zobel-Helas <zobel@debian.org>

diff --git a/dsa-nagios-checks/checks/dsa-check-running-kernel b/dsa-nagios-checks/checks/dsa-check-running-kernel
index 9d04d45..acf2edf 100755 (executable)
--- a/dsa-nagios-checks/checks/dsa-check-running-kernel
+++ b/dsa-nagios-checks/checks/dsa-check-running-kernel
@@ -169,13 +169,20 @@ freebsd_check_running_version() {
 
        local q='@\(#\)FreeBSD '"$r $v"
 
-       if zcat "$imagefile" | strings | egrep -q "$q"; then
+       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`"\
@@ -183,12 +190,12 @@ for on_disk in \
        "/boot/kfreebsd-`uname -r`.gz"; do
 
        if [ -e "$on_disk" ]; then
-               if [ ! -x "$(which strings)" ]; then
-                       echo "UNKNOWN: 'strings' command missing, perhaps install binutils?"
+               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`"
+                       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
@@ -196,13 +203,13 @@ for on_disk in \
                                fi
                        fi
                        [ -z "$on_disk_version" ] || break
-                       on_disk_version="`cat "$on_disk" | strings | grep 'Linux version' | head -n1`"
+                       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/')"
+                       on_disk_version="$(zcat $on_disk | $STRINGS | grep Debian | head -n 1 | sed -e 's/Debian [[:alnum:]]\+ (\(.*\))/\1/')"
                fi
        fi
        searched="$searched $on_disk"