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#! /bin/bash
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RpmDir=$1
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ModDir=$2
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Dir="$1/$2"
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# Note the list filename must have the format mod-[PACKAGE].list, for example,
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# mod-internal.list or mod-extra.list.  The PACKAGE is used to create a
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# override directory for the modules.
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List=$3
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Dest="$4"
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blacklist()
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{
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	cat > "$RpmDir/etc/modprobe.d/$1-blacklist.conf" <<-__EOF__
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	# This kernel module can be automatically loaded by non-root users. To
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	# enhance system security, the module is blacklisted by default to ensure
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	# system administrators make the module available for use as needed.
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	# See https://access.redhat.com/articles/3760101 for more details.
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	#
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	# Remove the blacklist by adding a comment # at the start of the line.
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	blacklist $1
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__EOF__
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}
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check_blacklist()
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{
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	mod=$(find $RpmDir/$ModDir -name "$1")
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	[ ! "$mod" ] && return 0
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	if modinfo $mod | grep -q '^alias:\s\+net-'; then
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		mod="${1##*/}"
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		mod="${mod%.ko*}"
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		echo "$mod has an alias that allows auto-loading. Blacklisting."
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		blacklist "$mod"
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	fi
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}
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find_depends()
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{
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	dep=$1
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	depends=`modinfo $dep | sed -n -e "/^depends/ s/^depends:[ \t]*//p"`
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	[ -z "$depends" ] && exit
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	for mod in ${depends//,/ }
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	do
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		match=$(grep "^$mod.ko" "$ListName")
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		[ -z "$match" ] && continue
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		# check if the module we are looking at is in mod-* too.
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		# if so we do not need to mark the dep as required.
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		mod2=${dep##*/}  # same as `basename $dep`, but faster
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		match2=$(grep "^$mod2" "$ListName")
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		if [ -n "$match2" ]
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		then
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			#echo $mod2 >> notreq.list
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			continue
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		fi
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		echo $mod.ko >> req.list
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	done
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}
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foreachp()
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{
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	P=$(nproc)
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	bgcount=0
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	while read mod; do
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		$1 "$mod" &
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		bgcount=$((bgcount + 1))
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		if [ $bgcount -eq $P ]; then
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			wait -n
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			bgcount=$((bgcount - 1))
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		fi
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	done
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	wait
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}
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# Destination was specified on the command line
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test -n "$4" && echo "$0: Override Destination $Dest has been specified."
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pushd $Dir
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OverrideDir=$(basename $List)
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OverrideDir=${OverrideDir%.*}
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OverrideDir=${OverrideDir#*-}
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mkdir -p $OverrideDir
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rm -rf modnames
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find . -name "*.ko" -type f > modnames
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# Look through all of the modules, and throw any that have a dependency in
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# our list into the list as well.
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rm -rf dep.list dep2.list
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rm -rf req.list req2.list
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touch dep.list req.list
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cp "$List" .
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# This variable needs to be exported because it is used in sub-script
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# executed by xargs
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export ListName=$(basename "$List")
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foreachp find_depends < modnames
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sort -u req.list > req2.list
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sort -u "$ListName" > modules2.list
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join -v 1 modules2.list req2.list > modules3.list
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for mod in $(cat modules3.list)
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do
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  # get the path for the module
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  modpath=`grep /$mod modnames`
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  [ -z "$modpath" ] && continue
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  echo $modpath >> dep.list
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done
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sort -u dep.list > dep2.list
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if [ -n "$Dest" ]; then
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	# now move the modules into the $Dest directory
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	for mod in `cat dep2.list`
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	do
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	  newpath=`dirname $mod | sed -e "s/kernel\\//$Dest\//"`
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	  mkdir -p $newpath
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	  mv $mod $newpath
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	  echo $mod | sed -e "s/kernel\\//$Dest\//" | sed -e "s|^.|${ModDir}|g" >> $RpmDir/$ListName
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	done
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fi
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popd
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# If we're signing modules, we can't leave the .mod files for the .ko files
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# we've moved in .tmp_versions/.  Remove them so the Kbuild 'modules_sign'
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# target doesn't try to sign a non-existent file.  This is kinda ugly, but
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# so are the modules-* packages.
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for mod in `cat ${Dir}/dep2.list`
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do
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  modfile=`basename $mod | sed -e 's/.ko/.mod/'`
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  rm .tmp_versions/$modfile
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done
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if [ ! -n "$Dest" ]; then
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	sed -e "s|^.|${ModDir}|g" ${Dir}/dep2.list > $RpmDir/$ListName
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	echo "./$RpmDir/$ListName created."
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	[ -d "$RpmDir/etc/modprobe.d/" ] || mkdir -p "$RpmDir/etc/modprobe.d/"
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	foreachp check_blacklist < $List
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fi
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# avoid an empty kernel-extra package
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echo "$ModDir/$OverrideDir" >> $RpmDir/$ListName
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pushd $Dir
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rm modnames dep.list dep2.list req.list req2.list
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rm "$ListName" modules2.list modules3.list
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popd