#!/bin/bash
#

BE CAREFUL! THIS SCRIPT IS INVOKED FROM A SETUID ROOT BINARY

#

function printhelp () {
echo “Usage: sys_uname [-h] [OPTION] [ — mod_path … ]”
echo “Prints kernel version string for modules”
echo
echo ” -h Print this help”
echo ” -f Choose closest kernel”
echo ” -l List available kernels”
echo ” -e Try to find an exact match”
echo ” -p Print version string for the running kernel”
exit 1
}
[ “$1” == “–help” ] && printhelp 1>&2

###########################################################

Parse options

###########################################################

while getopts “hflep” x ; do
WORKED=1
case “$x” in
p) PRINT_THIS_UNAME=Y ;;
f) FIND_CLOSEST=Y ;;
l) FIND_AVAIL=Y ;;
e) FIND_EXACT=Y ;;
h|*) printhelp ; exit 1 ;;
esac
done
[ “$WORKED” != 1 ] && PRINT_THIS_UNAME=Y

shift expr $OPTIND - 1

[ $# == 0 -a “$FIND_CLOSEST$FIND_AVAIL$FIND_EXACT” ] && {
printhelp 1>&2 ; exit 1;
}

MOD_PATHS=””
for x in $* ; do
# Only include a directory once
for y in $MOD_PATHS ; do
[ $x = $y -o $x -ef $y ] && x=”” ; break
break;
done
MOD_PATHS=”$MOD_PATHS $x”
done

###########################################################

Determine the version string of the running kernel

###########################################################

KVER=uname -r | cut -d "." -f 2;
if [ ${KVER} -eq 4 ]; then
unset SMP ALTIVEC
cat /proc/version | grep SMP > /dev/null
[ $? == 0 ] && SMP=”-smp”

if [ -f /proc/ksyms ]; then
    grep altivec /proc/ksyms
    [ $? != 0 ] && ALTIVEC="-noav"
fi
THIS_UNAME=`uname -r`$SMP$ALTIVEC

else
THIS_UNAME=uname -r
fi

###########################################################

Find all…

###########################################################

function find_avail () {
for x in $MOD_PATHS ; do
test -d $x || continue;
cd $x || continue;

_AVAIL=`find $x -maxdepth 1 -type d -exec test -f '{}/mol.o' -o -f '{}/mol.ko' \; -print`

for x in $_AVAIL ; do
    echo $x
done
done

}

###########################################################

Do it…

###########################################################

[ “$PRINT_THIS_UNAME” ] && {
echo $THIS_UNAME
exit 0
}
[ “$FIND_EXACT” ] && {
for x in $MOD_PATHS ; do
[ -f $x/$THIS_UNAME/mol.o -o -f $x/$THIS_UNAME/mol.ko ] && {
echo $x/$THIS_UNAME
exit 0
}
done
exit 1
}
[ “$FIND_AVAIL” ] && {
find_avail
}
[ “$FIND_CLOSEST” ] && {
AVAIL=find_avail
unset AVAIL_UNAMES
for x in $AVAIL ; do
AVAIL_UNAMES=”$AVAIL_UNAMES echo $x | sed s/.*modules[/]//”
done
MATCH=$BIN_DIR/kver_approx $THIS_UNAME $AVAIL_UNAMES || exit $?

for x in $AVAIL ; do
s=`echo $x | sed s/.*modules[/]//`
[ "$s" = "$MATCH" ] && { echo $x ; exit 0 ; }
done

}

exit 0