#! /bin/bash

# shellcheck disable=SC2164

RpmDir=$1

ModDir=$2

Dir="$1/$2"

# Note the list filename must have the format mod-[PACKAGE].list, for example,

# mod-internal.list or mod-extra.list.  The PACKAGE is used to create a

# override directory for the modules.

List=$3

Dest="$4"

blacklist()

{

	cat > "$RpmDir/etc/modprobe.d/$1-blacklist.conf" <<-__EOF__

	# This kernel module can be automatically loaded by non-root users. To

	# enhance system security, the module is blacklisted by default to ensure

	# system administrators make the module available for use as needed.

	# See https://access.redhat.com/articles/3760101 for more details.

	#

	# Remove the blacklist by adding a comment # at the start of the line.

	blacklist $1

__EOF__

}

check_blacklist()

{

	mod=$(find "$RpmDir/$ModDir" -name "$1")

	[ ! "$mod" ] && return 0

	if modinfo "$mod" | grep -q '^alias:\s\+net-'; then

		mod="${1##*/}"

		mod="${mod%.ko*}"

		echo "$mod has an alias that allows auto-loading. Blacklisting."

		blacklist "$mod"

	fi

}

find_depends()

{

	dep=$1

	depends=$(modinfo "$dep" | sed -n -e "/^depends/ s/^depends:[ \t]*//p")

	[ -z "$depends" ] && exit

	for mod in ${depends//,/ }

	do

		match=$(grep "^$mod.ko" "$ListName")

		[ -z "$match" ] && continue

		# check if the module we are looking at is in mod-* too.

		# if so we do not need to mark the dep as required.

		mod2=${dep##*/}  # same as $(basename $dep), but faster

		match2=$(grep "^$mod2" "$ListName")

		if [ -n "$match2" ]

		then

			#echo $mod2 >> notreq.list

			continue

		fi

		echo "$mod".ko >> req.list

	done

}

foreachp()

{

	P=$(nproc)

	bgcount=0

	while read -r mod; do

		$1 "$mod" &

		bgcount=$((bgcount + 1))

		if [ $bgcount -eq "$P" ]; then

			wait -n

			bgcount=$((bgcount - 1))

		fi

	done

	wait

}

# Destination was specified on the command line

test -n "$4" && echo "$0: Override Destination $Dest has been specified."

pushd "$Dir"

OverrideDir=$(basename "$List")

OverrideDir=${OverrideDir%.*}

OverrideDir=${OverrideDir#*-}

mkdir -p "$OverrideDir"

rm -rf modnames

find . -name "*.ko" -type f > modnames

# Look through all of the modules, and throw any that have a dependency in

# our list into the list as well.

rm -rf dep.list dep2.list

rm -rf req.list req2.list

touch dep.list req.list

cp "$List" .

# This variable needs to be exported because it is used in sub-script

# executed by xargs

ListName=$(basename "$List")

export ListName

foreachp find_depends < modnames

sort -u req.list > req2.list

sort -u "$ListName" > modules2.list

join -v 1 modules2.list req2.list > modules3.list

while IFS= read -r mod

do

    # get the path for the module

    modpath=$(grep /"$mod" modnames)

    [ -z "$modpath" ] && continue

    echo "$modpath" >> dep.list

done < modules3.list

sort -u dep.list > dep2.list

if [ -n "$Dest" ]; then

    # now move the modules into the $Dest directory

    while IFS= read -r mod

    do

	newpath=$(dirname "$mod" | sed -e "s/kernel\\//$Dest\//")

	mkdir -p "$newpath"

	mv "$mod" "$newpath"

	echo "$mod" | sed -e "s/kernel\\//$Dest\//" | sed -e "s|^.|${ModDir}|g" >> "$RpmDir"/"$ListName"

    done < dep2.list

fi

popd

if [ -z "$Dest" ]; then

	sed -e "s|^.|${ModDir}|g" "$Dir"/dep2.list > "$RpmDir/$ListName"

	echo "$RpmDir/$ListName created."

	[ -d "$RpmDir/etc/modprobe.d/" ] || mkdir -p "$RpmDir/etc/modprobe.d/"

	foreachp check_blacklist < "$List"

fi

# Many BIOS-es export a PNP-id which causes the floppy driver to autoload

# even though most modern systems don't have a 3.5" floppy driver anymore

# this replaces the old die_floppy_die.patch which removed the PNP-id from

# the module

floppylist=("$RpmDir"/"$ModDir"/kernel/drivers/block/floppy.ko*)

if [[ -n ${floppylist[0]} && -f ${floppylist[0]} ]]; then

     blacklist "floppy"

fi

# avoid an empty kernel-extra package

echo "$ModDir/$OverrideDir" >> "$RpmDir/$ListName"

pushd "$Dir"

rm modnames dep.list dep2.list req.list req2.list

rm "$ListName" modules2.list modules3.list

popd