#! /bin/sh

# heavily based upon find-suggests.ksyms by Andreas Gruenbacher <agruen@suse.de>.
# with modifications by Michael Brown <Michael_E_Brown@dell.com>
#
# -- added module versioning info to modalias() symbols
# -- removed code which inspects spec files.

IFS=$'\n'

print_modaliases() {
    declare class=$1 variants=$2 pos=$3
    if [ -n "$variants" ]; then
	echo "${class:0:pos}[$variants]${class:pos+1}"
    else
	[ -z "$class" ] || echo "$class"
    fi
}

combine_modaliases() {
    declare tag class variants pos n
    read class
    while read tag; do
	for ((n=0; n<${#class}; n++)); do
	    if [ "*" != "${class:n:1}" -a \
		 "${class:0:n}" = "${tag:0:n}" -a \
		 "${class:n+1}" = "${tag:n+1}" ] &&
	       ( [ -z "$pos" ] || [ $n = $pos ] ); then
		variants="${variants:-${class:n:1}}${tag:n:1}"
		pos=$n
		break
	    fi
	done
	if [ $n -eq ${#class} ]; then
	    print_modaliases "$class" "$variants" "$pos"
	    variants=
	    pos=
	    class=$tag
	fi
    done
    print_modaliases "$class" "$variants" "$pos"
}

get_modinfo() {
    module=$1

    # | head -n1 because some modules have *two* version tags. *cough*b44*cough*
    modver=$(/sbin/modinfo -F version "$module"| head -n1)
    modver=${modver// /_}

    # only add version tag if it has a version
    if [ -n "$modver" ]; then
        /sbin/modinfo -F alias "$module" \
        | sed -nre "s,(.+),modalias(\\1) = $modver,p"
    else
        /sbin/modinfo -F alias "$module" \
        | sed -nre "s,(.+),modalias(\\1),p"
    fi
}


tmp=${TMPDIR:-/tmp}
TMPDIR=$(mktemp -d ${tmp}/dkms-findprovides-$$-$RANDOM-XXXXXX)
trap "rm -rf $TMPDIR >/dev/null 2>&1"  QUIT EXIT HUP INT TERM

modlist=
for cand in $(grep -E '(/lib/modules/.+\.ko$|tgz$|tbz$|tar\.(gz|bz2|xz)$)') $*; do
    if echo $cand | grep -q -E '/lib/modules/.+\.ko$' > /dev/null 2>&1; then
        modlist="$modlist $cand"
    fi

    [ -f $cand ] || continue

    opts=x
    if gzip -t $cand >/dev/null 2>&1; then
        opts=${opts}z
    elif bzip2 -t $cand >/dev/null 2>&1; then
        opts=${opts}j
    elif xz -t $cand >/dev/null 2>&1; then
	opts=${opts}J
    fi
    tar ${opts}f $cand -C $TMPDIR > /dev/null 2>&1
done

for module in $(find $TMPDIR -name \*.ko) $modlist; do
    if echo $module | grep -q -E '.ko$' >/dev/null 2>&1; then
        # it is a straight module
        get_modinfo $module
        continue
    fi
done \
| sort -u \
| combine_modaliases
