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: 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>

1 files changed, 49 insertions, 1 deletions

diff --git a/scripts/package/builddeb b/scripts/package/builddeb
index a8662ef3ccee..541a1cfa9a6b 100644
--- a/scripts/package/builddeb
+++ b/scripts/package/builddeb
@@ -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