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deb-pkg: split debug symbols in their own package

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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: Anisse Astier <anisse@astier.eu>
Cc: Ben Hutchings <ben@decadent.org.uk>
Acked-by: maximilian attems <max@stro.at>
Signed-off-by: Michal Marek <mmarek@suse.cz>
This commit is contained in:
Anisse Astier 2013-07-03 16:02:04 +02:00 committed by Michal Marek
parent d20917670e
commit 810e843746
1 changed files with 49 additions and 1 deletions
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50
scripts/package/builddeb
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@ -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