kbuild: deb-pkg: switch over to source format 3.0 (quilt)

Change the source format from "1.0" to "3.0 (quilt)" because it works
more cleanly.

All files except .config and debian/ go into the orig tarball.
Add a single patch, debian/patches/config, and delete the ugly
extend-diff-ignore patterns.

The debian tarball will be compressed into *.debian.tar.xz by default.
If you like to use a different compression mode, you can pass the
command line option, DPKG_FLAGS=-Zgzip, for example.

The orig tarball only supports gzip for now. The combination of
gzip and xz is somewhat clumsy, but it is not a practical problem.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>

scripts/Makefile.package

@@ -105,7 +105,7 @@ debian-orig: linux.tar.gz debian
 PHONY += deb-pkg
 deb-pkg: debian-orig
 	+dpkg-buildpackage -r$(KBUILD_PKG_ROOTCMD) -a$$(cat debian/arch) $(DPKG_FLAGS) \
-		--build=source,binary --source-option=-sP -nc -us -uc
+		--build=source,binary -nc -us -uc
 
 PHONY += bindeb-pkg
 bindeb-pkg: debian

scripts/package/mkdebian

@@ -135,29 +135,24 @@ else
 fi
 
 mkdir -p debian/source/
-echo "1.0" > debian/source/format
-
-# Ugly: ignore anything except .config or debian/
-cat<<'EOF' > debian/source/local-options
-diff-ignore
-
-extend-diff-ignore = ^[^.d]
-
-extend-diff-ignore = ^\.[^c]
-extend-diff-ignore = ^\.c($|[^o])
-extend-diff-ignore = ^\.co($|[^n])
-extend-diff-ignore = ^\.con($|[^f])
-extend-diff-ignore = ^\.conf($|[^i])
-extend-diff-ignore = ^\.confi($|[^g])
-extend-diff-ignore = ^\.config.
-
-extend-diff-ignore = ^d($|[^e])
-extend-diff-ignore = ^de($|[^b])
-extend-diff-ignore = ^deb($|[^i])
-extend-diff-ignore = ^debi($|[^a])
-extend-diff-ignore = ^debia($|[^n])
-extend-diff-ignore = ^debian[^/]
-EOF
+echo "3.0 (quilt)" > debian/source/format
+
+{
+	echo "diff-ignore"
+	echo "extend-diff-ignore = .*"
+} > debian/source/local-options
+
+# Add .config as a patch
+mkdir -p debian/patches
+{
+	echo "Subject: Add .config"
+	echo "Author: ${maintainer}"
+	echo
+	echo "--- /dev/null"
+	echo "+++ linux/.config"
+	diff -u /dev/null "${KCONFIG_CONFIG}" | tail -n +3
+} > debian/patches/config
+echo config > debian/patches/series
 
 echo $debarch > debian/arch
 extra_build_depends=", $(if_enabled_echo CONFIG_UNWINDER_ORC libelf-dev:native)"