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SubjectRe: [PATCH 1/2] deb-pkg: split debug symbols in their own package
Any comments ?

Anisse

On Fri, 22 Mar 2013 11:06:00 +0100, Anisse Astier <anisse@astier.eu> wrote :

> 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>
> ---
> scripts/package/builddeb | 33 ++++++++++++++++++++++++++++++++-
> 1 file changed, 32 insertions(+), 1 deletion(-)
>
> diff --git a/scripts/package/builddeb b/scripts/package/builddeb
> index acb8650..7f7a7fd 100644
> --- a/scripts/package/builddeb
> +++ b/scripts/package/builddeb
> @@ -78,17 +78,19 @@ 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
>
> # 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 "$fwdir/DEBIAN"
> @@ -98,6 +100,8 @@ mkdir -p "$libc_headers_dir/usr/share/doc/$libc_headers_packagename"
> mkdir -m 755 -p "$kernel_headers_dir/DEBIAN"
> mkdir -p "$kernel_headers_dir/usr/share/doc/$kernel_headers_packagename"
> mkdir -p "$kernel_headers_dir/lib/modules/$version/"
> +mkdir -p "$dbg_dir/usr/share/doc/$dbg_packagename"
> +mkdir -m 755 -p "$dbg_dir/DEBIAN"
> if [ "$ARCH" = "um" ] ; then
> mkdir -p "$tmpdir/usr/lib/uml/modules/$version" "$tmpdir/usr/bin"
> fi
> @@ -128,8 +132,24 @@ if grep -q '^CONFIG_MODULES=y' .config ; then
> mv "$tmpdir/lib/modules/$version"/* "$tmpdir/usr/lib/uml/modules/$version/"
> rmdir "$tmpdir/lib/modules/$version"
> fi
> + # Build debug package
> + (
> + 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
>
> +mkdir -p $dbg_dir/usr/lib/debug/lib/modules/$version/
> +cp vmlinux $dbg_dir/usr/lib/debug/lib/modules/$version/
> +
> if [ "$ARCH" != "um" ]; then
> $MAKE headers_check KBUILD_SRC=
> $MAKE headers_install KBUILD_SRC= INSTALL_HDR_PATH="$libc_headers_dir/usr"
> @@ -297,6 +317,17 @@ if [ "$ARCH" != "um" ]; then
> create_package "$libc_headers_packagename" "$libc_headers_dir"
> fi
>
> +cat <<EOF >> debian/control
> +
> +Package: $dbg_packagename
> +Section: devel
> +Provides: linux-debug, linux-debug-$version
> +Architecture: any
> +Description: Linux kernel debugging symbols for $version
> + This package will come in handy if you need to debug the kernel.
> +EOF
> +
> +create_package "$dbg_packagename" "$dbg_dir"
> create_package "$packagename" "$tmpdir"
>
> exit 0


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