kbuild: deb-pkg: create source package without cleaning

If you run 'make deb-pkg', all objects are lost due to 'make clean',
which makes the incremental builds impossible.

Instead of cleaning, pass the exclude list to tar's --exclude-from
option.

Previously, *.diff.gz contained some check-in files such as
.clang-format, .cocciconfig.

With this commit, *.diff.gz will only contain the .config and debian/.
The other source files will go into the .orig tarball.

linux.tar.gz is rebuilt only when the source files that would go into
the tarball are changed.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>

scripts/Makefile.package

@@ -43,13 +43,47 @@ if test "$(objtree)" != "$(srctree)"; then \
 	echo >&2 "  ERROR:"; \
 	echo >&2 "  Building source tarball is not possible outside the"; \
 	echo >&2 "  kernel source tree. Don't set KBUILD_OUTPUT, or use the"; \
-	echo >&2 "  binrpm-pkg or bindeb-pkg target instead."; \
+	echo >&2 "  binrpm-pkg target instead."; \
 	echo >&2; \
 	false; \
 fi ; \
 tar -I $(KGZIP) -c $(RCS_TAR_IGNORE) -f $(2).tar.gz \
 	--transform 's:^:$(2)/:S' $(TAR_CONTENT) $(3)
 
+# .tmp_filelist .tmp_filelist_exclude
+# ---------------------------------------------------------------------------
+
+scripts/list-gitignored: FORCE
+	$(Q)$(MAKE) -f $(srctree)/Makefile scripts_package
+
+# 1f5d3a6b6532e25a5cdf1f311956b2b03d343a48 removed '*.rej' from .gitignore,
+# but it is definitely a generated file.
+filechk_filelist = \
+	$< --exclude='*.rej' --output=$@_exclude --prefix=./ --rootdir=$(srctree) --stat=-
+
+.tmp_filelist: scripts/list-gitignored FORCE
+	$(call filechk,filelist)
+
+# tarball
+# ---------------------------------------------------------------------------
+
+quiet_cmd_tar = TAR     $@
+      cmd_tar = tar -c -f $@ $(tar-compress-opt) $(tar-exclude-opt) \
+                --owner=0 --group=0 --sort=name \
+                --transform 's:^\.:$*:S' -C $(tar-rootdir) .
+
+tar-rootdir := $(srctree)
+
+%.tar.gz: private tar-compress-opt := -I $(KGZIP)
+%.tar.gz:
+	$(call cmd,tar)
+
+# Linux source tarball
+# ---------------------------------------------------------------------------
+
+linux.tar.gz: tar-exclude-opt = --exclude=./$@ --exclude-from=$<_exclude
+linux.tar.gz: .tmp_filelist
+
 # rpm-pkg
 # ---------------------------------------------------------------------------
 PHONY += rpm-pkg
@@ -80,13 +114,12 @@ binrpm-pkg:
 		$(UTS_MACHINE)-linux -bb $(objtree)/binkernel.spec
 
 PHONY += deb-pkg
-deb-pkg:
-	$(MAKE) clean
+deb-pkg: linux.tar.gz
 	$(CONFIG_SHELL) $(srctree)/scripts/package/mkdebian
-	$(call cmd,src_tar,$(KDEB_SOURCENAME))
 	origversion=$$(dpkg-parsechangelog -SVersion |sed 's/-[^-]*$$//');\
-		mv $(KDEB_SOURCENAME).tar.gz ../$(KDEB_SOURCENAME)_$${origversion}.orig.tar.gz
-	+dpkg-buildpackage -r$(KBUILD_PKG_ROOTCMD) -a$$(cat debian/arch) $(DPKG_FLAGS) --source-option=-sP -i.git -us -uc
+		cp linux.tar.gz ../$(KDEB_SOURCENAME)_$${origversion}.orig.tar.gz
+	+dpkg-buildpackage -r$(KBUILD_PKG_ROOTCMD) -a$$(cat debian/arch) $(DPKG_FLAGS) \
+		--build=source,binary --source-option=-sP -nc -us -uc
 
 PHONY += bindeb-pkg
 bindeb-pkg:
@@ -174,4 +207,7 @@ help:
 	@echo '  perf-tarxz-src-pkg  - Build $(perf-tar).tar.xz source tarball'
 	@echo '  perf-tarzst-src-pkg - Build $(perf-tar).tar.zst source tarball'
 
+PHONY += FORCE
+FORCE:
+
 .PHONY: $(PHONY)

scripts/package/mkdebian

@@ -84,6 +84,8 @@ set_debarch() {
 	fi
 }
 
+rm -rf debian
+
 # Some variables and settings used throughout the script
 version=$KERNELRELEASE
 if [ -n "$KDEB_PKGVERSION" ]; then
@@ -135,6 +137,28 @@ 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 $debarch > debian/arch
 extra_build_depends=", $(if_enabled_echo CONFIG_UNWINDER_ORC libelf-dev:native)"
 extra_build_depends="$extra_build_depends, $(if_enabled_echo CONFIG_SYSTEM_TRUSTED_KEYRING libssl-dev:native)"