#! /bin/sh -e
# Latest kernel version of this vintage.

KERNELDIR=~/devel/kernel

# Return the latest kernel versions.
get_kernel_vers()
{
#     if [ x"$GK_KERNS" = x ]; then
# 	GK_KERNS=$(finger @finger.kernel.org | tail +2 | cut -s -d: -f2- | sed 's/[ 	]*//')
#     fi
    if [ x"$GK_KERNS" = x ]; then
	GK_KERNS=$(lynx -width=500 -dump http://www.kernel.org/kdist/finger_banner | tail +2 | cut -s -d: -f2- | sed 's/[ 	]*//')
    fi
    if [ x"$GK_KERNS" = x ]; then
	echo Failed to get kernel list from kernel.org >&2
	exit 1
    fi
    # Vanity are there too: only take recognized patches.
    # Ignore 2.4-bk versions: I don't know where they're coming from 8(
    echo "$GK_KERNS" # | egrep -- "$1|-rc|-bk|-pre|^[0-9]*\.[0-9]*\.[0-9]*\$" | grep -v '2\.4\.[0-9]*-bk[0-9]*'
}


PROBE=0
if [ x"$1" = x--probe ]; then
    PROBE=1
    shift
fi

case "$1" in --*)
    echo "Usage: $0 [--probe] [kernel-base-version]" >&2
    echo "Returns the latest version on the system, or with --probe," >&2
    echo "returns the latest version on network." >&2
    exit 1
    ;;
esac

if [ $# -eq 0 ]; then set .; fi

if [ $PROBE = 1 ]; then
    CANDIDATES=$(get_kernel_vers)
else
    CANDIDATES=$(cd $KERNELDIR && ls -d linux-* | fgrep -v '.tmp' | grep -v -- '-ppc' | sed 's/^linux-//')
fi

for w; do
    case "$w" in
	# By default, ignore any vanity kernels.
	.) FILTER="^[0-9.]*(-rc[0-9]*|-bk[0-9]*|-pre[0-9]*)*\$";;
	# eg -mm.
	-*) FILTER="^[0-9.]*(-rc[0-9]*|-bk[0-9]*|-pre[0-9]*)*$w[0-9]*\$";;
	# eg. 2.4
	*) FILTER="^$w[0-9.]*(-rc[0-9]*|-bk[0-9]*|-pre[0-9]*)*\$";;
    esac

    lkvercmp $(echo "$CANDIDATES" | egrep -- "$FILTER")
done