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Commit 810e8437 authored by Anisse Astier's avatar Anisse Astier Committed by Michal Marek
Browse files

deb-pkg: split debug symbols in their own package 



This can reduce almost 3 times the size of the linux-image package,
while keeping the debug symbols available for this particular build, in
their own package.

This mimics the way kernels are built in debian, ubuntu, or with
make-kpkg, and comes at the price of a small slowdown in the building of
packages.

Signed-off-by: default avatarAnisse Astier <anisse@astier.eu>
Cc: Ben Hutchings <ben@decadent.org.uk>
Acked-by: default avatarmaximilian attems <max@stro.at>
Signed-off-by: default avatarMichal Marek <mmarek@suse.cz>
parent d2091767

scripts/package/builddeb

+49 −1
Original line number Diff line number Diff line
@@ -78,17 +78,21 @@ tmpdir="$objtree/debian/tmp" 
fwdir="$objtree/debian/fwtmp"

kernel_headers_dir="$objtree/debian/hdrtmp"

libc_headers_dir="$objtree/debian/headertmp"

dbg_dir="$objtree/debian/dbgtmp"

packagename=linux-image-$version

fwpackagename=linux-firmware-image

kernel_headers_packagename=linux-headers-$version

libc_headers_packagename=linux-libc-dev

dbg_packagename=$packagename-dbg



if [ "$ARCH" = "um" ] ; then

	packagename=user-mode-linux-$version

fi



BUILD_DEBUG="$(grep -s '^CONFIG_DEBUG_INFO=y' $KCONFIG_CONFIG || true)"



# Setup the directory structure

rm -rf "$tmpdir" "$fwdir" "$kernel_headers_dir" "$libc_headers_dir"

rm -rf "$tmpdir" "$fwdir" "$kernel_headers_dir" "$libc_headers_dir" "$dbg_dir"

mkdir -m 755 -p "$tmpdir/DEBIAN"

mkdir -p  "$tmpdir/lib" "$tmpdir/boot" "$tmpdir/usr/share/doc/$packagename"

mkdir -m 755 -p "$fwdir/DEBIAN"
@@ -101,6 +105,10 @@ mkdir -p "$kernel_headers_dir/lib/modules/$version/" 
if [ "$ARCH" = "um" ] ; then

	mkdir -p "$tmpdir/usr/lib/uml/modules/$version" "$tmpdir/usr/bin"

fi

if [ -n "$BUILD_DEBUG" ] ; then

	mkdir -p "$dbg_dir/usr/share/doc/$dbg_packagename"

	mkdir -m 755 -p "$dbg_dir/DEBIAN"

fi



# Build and install the kernel

if [ "$ARCH" = "um" ] ; then
@@ -128,6 +136,20 @@ if grep -q '^CONFIG_MODULES=y' $KCONFIG_CONFIG ; then 
		mv "$tmpdir/lib/modules/$version"/* "$tmpdir/usr/lib/uml/modules/$version/"

		rmdir "$tmpdir/lib/modules/$version"

	fi

	if [ -n "$BUILD_DEBUG" ] ; then

		(

			cd $tmpdir

			for module in $(find lib/modules/ -name *.ko); do

				mkdir -p $(dirname $dbg_dir/usr/lib/debug/$module)

				# only keep debug symbols in the debug file

				objcopy --only-keep-debug $module $dbg_dir/usr/lib/debug/$module

				# strip original module from debug symbols

				objcopy --strip-debug $module

				# then add a link to those

				objcopy --add-gnu-debuglink=$dbg_dir/usr/lib/debug/$module $module

			done

		)

	fi

fi



if [ "$ARCH" != "um" ]; then
@@ -300,4 +322,30 @@ fi 


create_package "$packagename" "$tmpdir"



if [ -n "$BUILD_DEBUG" ] ; then

	# Build debug package

	# Different tools want the image in different locations

	# perf

	mkdir -p $dbg_dir/usr/lib/debug/lib/modules/$version/

	cp vmlinux $dbg_dir/usr/lib/debug/lib/modules/$version/

	# systemtap

	mkdir -p $dbg_dir/usr/lib/debug/boot/

	ln -s ../lib/modules/$version/vmlinux $dbg_dir/usr/lib/debug/boot/vmlinux-$version

	# kdump-tools

	ln -s lib/modules/$version/vmlinux $dbg_dir/usr/lib/debug/vmlinux-$version



	cat <<EOF >> debian/control



Package: $dbg_packagename

Section: debug

Provides: linux-debug, linux-debug-$version

Architecture: any

Description: Linux kernel debugging symbols for $version

 This package will come in handy if you need to debug the kernel. It provides

 all the necessary debug symbols for the kernel and its modules.

EOF



	create_package "$dbg_packagename" "$dbg_dir"

fi



exit 0