kbuild: use git-archive for source package creation

Commit 5c3d1d0abb ("kbuild: add a tool to list files ignored by git")
added a new tool, scripts/list-gitignored. My intention was to create
source packages without cleaning the source tree, without relying on git.

Linus strongly objected to it, and suggested using 'git archive' instead.
[1] [2] [3]

This commit goes in that direction - Remove scripts/list-gitignored.c
and rewrites Makefiles and scripts to use 'git archive' for building
Debian and RPM source packages. It also makes 'make perf-tar*-src-pkg'
use 'git archive' again.

Going forward, building source packages is only possible in a git-managed
tree. Building binary packages does not require git.

[1]: https://lore.kernel.org/lkml/CAHk-=wi49sMaC7vY1yMagk7eqLK=1jHeHQ=yZ_k45P=xBccnmA@mail.gmail.com/
[2]: https://lore.kernel.org/lkml/CAHk-=wh5AixGsLeT0qH2oZHKq0FLUTbyTw4qY921L=PwYgoGVw@mail.gmail.com/
[3]: https://lore.kernel.org/lkml/CAHk-=wgM-W6Fu==EoAVCabxyX8eYBz9kNC88-tm9ExRQwA79UQ@mail.gmail.com/

Fixes: 5c3d1d0abb ("kbuild: add a tool to list files ignored by git")
Fixes: e0ca16749a ("kbuild: make perf-tar*-src-pkg work without relying on git")
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

Makefile

@@ -274,8 +274,7 @@ no-dot-config-targets := $(clean-targets) \
 			 cscope gtags TAGS tags help% %docs check% coccicheck \
 			 $(version_h) headers headers_% archheaders archscripts \
 			 %asm-generic kernelversion %src-pkg dt_binding_check \
-			 outputmakefile rustavailable rustfmt rustfmtcheck \
-			 scripts_package
+			 outputmakefile rustavailable rustfmt rustfmtcheck
 # Installation targets should not require compiler. Unfortunately, vdso_install
 # is an exception where build artifacts may be updated. This must be fixed.
 no-compiler-targets := $(no-dot-config-targets) install dtbs_install \
@@ -1656,10 +1655,6 @@ distclean: mrproper
 %pkg: include/config/kernel.release FORCE
 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
 
-PHONY += scripts_package
-scripts_package: scripts_basic
-	$(Q)$(MAKE) $(build)=scripts scripts/list-gitignored
-
 # Brief documentation of the typical targets used
 # ---------------------------------------------------------------------------
 

scripts/.gitignore

@@ -3,7 +3,6 @@
 /generate_rust_target
 /insert-sys-cert
 /kallsyms
-/list-gitignored
 /module.lds
 /recordmcount
 /sign-file

scripts/Makefile

@@ -38,7 +38,7 @@ HOSTCFLAGS_sorttable.o += -DMCOUNT_SORT_ENABLED
 endif
 
 # The following programs are only built on demand
-hostprogs += list-gitignored unifdef
+hostprogs += unifdef
 
 # The module linker script is preprocessed on demand
 targets += module.lds

scripts/Makefile.package

@@ -2,6 +2,7 @@
 # Makefile for the different targets used to generate full packages of a kernel
 
 include $(srctree)/scripts/Kbuild.include
+include $(srctree)/scripts/Makefile.lib
 
 KERNELPATH := kernel-$(subst -,_,$(KERNELRELEASE))
 KBUILD_PKG_ROOTCMD ?="fakeroot -u"
@@ -26,54 +27,46 @@ fi ; \
 tar -I $(KGZIP) -c $(RCS_TAR_IGNORE) -f $(2).tar.gz \
 	--transform 's:^:$(2)/:S' $(TAR_CONTENT) $(3)
 
-# .tmp_filelist .tmp_filelist_exclude
+# tarball compression
 # ---------------------------------------------------------------------------
 
-scripts/list-gitignored: FORCE
-	$(Q)$(MAKE) -f $(srctree)/Makefile scripts_package
+%.tar.gz: %.tar
+	$(call cmd,gzip)
 
-# 1f5d3a6b6532e25a5cdf1f311956b2b03d343a48 removed '*.rej' from .gitignore,
-# but it is definitely a generated file.
-filechk_filelist = \
-	$< --exclude='*.rej' --output=$@_exclude --prefix=./ --rootdir=$(srctree) --stat=-
+%.tar.bz2: %.tar
+	$(call cmd,bzip2)
 
-.tmp_filelist: scripts/list-gitignored FORCE
-	$(call filechk,filelist)
+%.tar.xz: %.tar
+	$(call cmd,xzmisc)
 
-# tarball
+%.tar.zst: %.tar
+	$(call cmd,zstd)
+
+# Git
 # ---------------------------------------------------------------------------
 
-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) .
+filechk_HEAD = git -C $(srctree) rev-parse --verify HEAD 2>/dev/null
 
-tar-rootdir := $(srctree)
+.tmp_HEAD: check-git FORCE
+	$(call filechk,HEAD)
 
-%.tar:
-	$(call cmd,tar)
-
-%.tar.gz: private tar-compress-opt := -I $(KGZIP)
-%.tar.gz:
-	$(call cmd,tar)
-
-%.tar.bz2: private tar-compress-opt := -I $(KBZIP2)
-%.tar.bz2:
-	$(call cmd,tar)
-
-%.tar.xz: private tar-compress-opt := -I $(XZ)
-%.tar.xz:
-	$(call cmd,tar)
-
-%.tar.zst: private tar-compress-opt := -I $(ZSTD)
-%.tar.zst:
-	$(call cmd,tar)
+PHONY += check-git
+check-git:
+	@if ! $(srctree)/scripts/check-git; then \
+		echo >&2 "error: creating source package requires git repository"; \
+		false; \
+	fi
 
 # Linux source tarball
 # ---------------------------------------------------------------------------
 
-linux.tar.gz: tar-exclude-opt = --exclude=./$@ --exclude-from=$<_exclude
-linux.tar.gz: .tmp_filelist
+quiet_cmd_archive_linux = ARCHIVE $@
+      cmd_archive_linux = \
+	git -C $(srctree) archive --output=$$(realpath $@) --prefix=$(basename $@)/ $$(cat $<)
+
+targets += linux.tar
+linux.tar: .tmp_HEAD FORCE
+	$(call if_changed,archive_linux)
 
 # rpm-pkg
 # ---------------------------------------------------------------------------
@@ -148,74 +141,62 @@ snap-pkg:
 # dir-pkg tar*-pkg - tarball targets
 # ---------------------------------------------------------------------------
 
-tar-pkg-tarball = linux-$(KERNELRELEASE)-$(ARCH).$(1)
-tar-pkg-phony = $(subst .,,$(1))-pkg
-
 tar-install: FORCE
 	$(Q)$(MAKE) -f $(srctree)/Makefile
 	+$(Q)$(srctree)/scripts/package/buildtar $@
 
+quiet_cmd_tar = TAR     $@
+      cmd_tar = cd $<; tar cf ../$@ --owner=root --group=root --sort=name *
+
+linux-$(KERNELRELEASE)-$(ARCH).tar: tar-install
+	$(call cmd,tar)
+
 PHONY += dir-pkg
 dir-pkg: tar-install
 	@echo "Kernel tree successfully created in $<"
 
-define tar-pkg-rule
-PHONY += $(tar-pkg-phony)
-$(tar-pkg-phony): $(tar-pkg-tarball)
+PHONY += tar-pkg
+tar-pkg: linux-$(KERNELRELEASE)-$(ARCH).tar
 	@:
 
-$(tar-pkg-tarball): private tar-rootdir := tar-install
-$(tar-pkg-tarball): tar-install
-endef
-
-$(foreach x, tar tar.gz tar.bz2 tar.xz tar.zst, $(eval $(call tar-pkg-rule,$(x))))
+tar%-pkg: linux-$(KERNELRELEASE)-$(ARCH).tar.% FORCE
+	@:
 
 # perf-tar*-src-pkg - generate a source tarball with perf source
 # ---------------------------------------------------------------------------
 
-perf-tar-src-pkg-tarball = perf-$(KERNELVERSION).$(1)
-perf-tar-src-pkg-phony   = perf-$(subst .,,$(1))-src-pkg
+.tmp_perf:
+	$(Q)mkdir .tmp_perf
 
-quiet_cmd_stage_perf_src = STAGE   $@
-      cmd_stage_perf_src = \
-	rm -rf $@; \
-	mkdir -p $@; \
-	tar -c -f - --exclude-from=$<_exclude -C $(srctree) --files-from=$(srctree)/tools/perf/MANIFEST | \
-	tar -x -f - -C $@
-
-.tmp_perf: .tmp_filelist
-	$(call cmd,stage_perf_src)
-
-filechk_perf_head = \
-	if test -z "$(git -C $(srctree) rev-parse --show-cdup 2>/dev/null)" && \
-	       head=$$(git -C $(srctree) rev-parse --verify HEAD 2>/dev/null); then \
-		echo $$head; \
-	else \
-		echo "not a git tree"; \
-	fi
-
-.tmp_perf/HEAD: .tmp_perf FORCE
-	$(call filechk,perf_head)
+.tmp_perf/HEAD: .tmp_HEAD | .tmp_perf
+	$(call cmd,copy)
 
 quiet_cmd_perf_version_file = GEN     $@
       cmd_perf_version_file = cd $(srctree)/tools/perf; util/PERF-VERSION-GEN $(dir $(abspath $@))
 
-# PERF-VERSION-FILE and HEAD are independent, but this avoids updating the
+# PERF-VERSION-FILE and .tmp_HEAD are independent, but this avoids updating the
 # timestamp of PERF-VERSION-FILE.
 # The best is to fix tools/perf/util/PERF-VERSION-GEN.
-.tmp_perf/PERF-VERSION-FILE: .tmp_perf/HEAD $(srctree)/tools/perf/util/PERF-VERSION-GEN
+.tmp_perf/PERF-VERSION-FILE: .tmp_HEAD $(srctree)/tools/perf/util/PERF-VERSION-GEN | .tmp_perf
 	$(call cmd,perf_version_file)
 
-define perf-tar-src-pkg-rule
-PHONY += $(perf-tar-src-pkg-phony)
-$(perf-tar-src-pkg-phony): $(perf-tar-src-pkg-tarball)
+quiet_cmd_archive_perf = ARCHIVE $@
+      cmd_archive_perf = \
+	git -C $(srctree) archive --output=$$(realpath $@) --prefix=$(basename $@)/ \
+	--add-file=$$(realpath $(word 2, $^)) \
+	--add-file=$$(realpath $(word 3, $^)) \
+	$$(cat $(word 2, $^))^{tree} $$(cat $<)
+
+targets += perf-$(KERNELVERSION).tar
+perf-$(KERNELVERSION).tar: tools/perf/MANIFEST .tmp_perf/HEAD .tmp_perf/PERF-VERSION-FILE FORCE
+	$(call if_changed,archive_perf)
+
+PHONY += perf-tar-src-pkg
+perf-tar-src-pkg: perf-$(KERNELVERSION).tar
 	@:
 
-$(perf-tar-src-pkg-tarball): private tar-rootdir := .tmp_perf
-$(perf-tar-src-pkg-tarball): .tmp_filelist .tmp_perf/HEAD .tmp_perf/PERF-VERSION-FILE
-endef
-
-$(foreach x, tar tar.gz tar.bz2 tar.xz tar.zst, $(eval $(call perf-tar-src-pkg-rule,$(x))))
+perf-tar%-src-pkg: perf-$(KERNELVERSION).tar.% FORCE
+	@:
 
 # Help text displayed when executing 'make help'
 # ---------------------------------------------------------------------------
@@ -243,4 +224,13 @@ help:
 PHONY += FORCE
 FORCE:
 
+# Read all saved command lines and dependencies for the $(targets) we
+# may be building above, using $(if_changed{,_dep}). As an
+# optimization, we don't need to read them if the target does not
+# exist, we will rebuild anyway in that case.
+
+existing-targets := $(wildcard $(sort $(targets)))
+
+-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
+
 .PHONY: $(PHONY)

scripts/check-git

@@ -0,0 +1,14 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# succeed if we are in a git repository
+
+srctree="$(dirname $0)/.."
+
+if ! git -C "${srctree}" rev-parse --verify HEAD >/dev/null 2>/dev/null; then
+	exit 1
+fi
+
+if ! test -z $(git -C "${srctree}" rev-parse --show-cdup 2>/dev/null); then
+	exit 1
+fi

scripts/package/gen-diff-patch

@@ -0,0 +1,44 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-only
+
+diff_patch="${1}"
+untracked_patch="${2}"
+srctree=$(dirname $0)/../..
+
+rm -f ${diff_patch} ${untracked_patch}
+
+if ! ${srctree}/scripts/check-git; then
+	exit
+fi
+
+mkdir -p "$(dirname ${diff_patch})" "$(dirname ${untracked_patch})"
+
+git -C "${srctree}" diff HEAD > "${diff_patch}"
+
+if [ ! -s "${diff_patch}" ]; then
+	rm -f "${diff_patch}"
+	exit
+fi
+
+git -C ${srctree} status --porcelain --untracked-files=all |
+while read stat path
+do
+	if [ "${stat}" = '??' ]; then
+
+		if ! diff -u /dev/null "${srctree}/${path}" > .tmp_diff &&
+			! head -n1 .tmp_diff | grep -q "Binary files"; then
+			{
+				echo "--- /dev/null"
+				echo "+++ linux/$path"
+				cat .tmp_diff | tail -n +3
+			} >> ${untracked_patch}
+		fi
+	fi
+done
+
+rm -f .tmp_diff
+
+if [ ! -s "${diff_patch}" ]; then
+	rm -f "${diff_patch}"
+	exit
+fi

scripts/package/mkdebian

@@ -91,7 +91,7 @@ version=$KERNELRELEASE
 if [ -n "$KDEB_PKGVERSION" ]; then
 	packageversion=$KDEB_PKGVERSION
 else
-	packageversion=$version-$($srctree/init/build-version)
+	packageversion=$(${srctree}/scripts/setlocalversion --no-local ${srctree})-$($srctree/init/build-version)
 fi
 sourcename=${KDEB_SOURCENAME:-linux-upstream}
 
@@ -152,6 +152,14 @@ mkdir -p debian/patches
 } > debian/patches/config
 echo config > debian/patches/series
 
+$(dirname $0)/gen-diff-patch debian/patches/diff.patch debian/patches/untracked.patch
+if [ -f debian/patches/diff.patch ]; then
+	echo diff.patch >> debian/patches/series
+fi
+if [ -f debian/patches/untracked.patch ]; then
+	echo untracked.patch >> debian/patches/series
+fi
+
 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)"

scripts/package/mkspec

@@ -19,6 +19,8 @@ else
 	mkdir -p rpmbuild/SOURCES
 	cp linux.tar.gz rpmbuild/SOURCES
 	cp "${KCONFIG_CONFIG}" rpmbuild/SOURCES/config
+	$(dirname $0)/gen-diff-patch rpmbuild/SOURCES/diff.patch rpmbuild/SOURCES/untracked.patch
+	touch rpmbuild/SOURCES/diff.patch rpmbuild/SOURCES/untracked.patch
 fi
 
 if grep -q CONFIG_MODULES=y include/config/auto.conf; then
@@ -53,6 +55,8 @@ sed -e '/^DEL/d' -e 's/^\t*//' <<EOF
 	URL: https://www.kernel.org
 $S	Source0: linux.tar.gz
 $S	Source1: config
+$S	Source2: diff.patch
+$S	Source3: untracked.patch
 	Provides: $PROVIDES
 $S	BuildRequires: bc binutils bison dwarves
 $S	BuildRequires: (elfutils-libelf-devel or libelf-devel) flex
@@ -90,6 +94,12 @@ $S$M
 $S	%prep
 $S	%setup -q -n linux
 $S	cp %{SOURCE1} .config
+$S	if [ -s %{SOURCE2} ]; then
+$S		patch -p1 < %{SOURCE2}
+$S	fi
+$S	if [ -s %{SOURCE3} ]; then
+$S		patch -p1 < %{SOURCE3}
+$S	fi
 $S
 $S	%build
 $S	$MAKE %{?_smp_mflags} KERNELRELEASE=$KERNELRELEASE KBUILD_BUILD_VERSION=%{release}

scripts/setlocalversion

@@ -11,10 +11,16 @@
 #
 
 usage() {
-	echo "Usage: $0 [srctree]" >&2
+	echo "Usage: $0 [--no-local] [srctree]" >&2
 	exit 1
 }
 
+no_local=false
+if test "$1" = "--no-local"; then
+	no_local=true
+	shift
+fi
+
 srctree=.
 if test $# -gt 0; then
 	srctree=$1
@@ -26,14 +32,22 @@ fi
 
 scm_version()
 {
-	local short
+	local short=false
+	local no_dirty=false
 	local tag
-	short=false
+
+	while [ $# -gt 0 ];
+	do
+		case "$1" in
+		--short)
+			short=true;;
+		--no-dirty)
+			no_dirty=true;;
+		esac
+		shift
+	done
 
 	cd "$srctree"
-	if test "$1" = "--short"; then
-		short=true
-	fi
 
 	if test -n "$(git rev-parse --show-cdup 2>/dev/null)"; then
 		return
@@ -75,6 +89,10 @@ scm_version()
 		printf '%s%s' -g "$(echo $head | cut -c1-12)"
 	fi
 
+	if ${no_dirty}; then
+		return
+	fi
+
 	# Check for uncommitted changes.
 	# This script must avoid any write attempt to the source tree, which
 	# might be read-only.
@@ -110,11 +128,6 @@ collect_files()
 	echo "$res"
 }
 
-if ! test -e include/config/auto.conf; then
-	echo "Error: kernelrelease not valid - run 'make prepare' to update it" >&2
-	exit 1
-fi
-
 if [ -z "${KERNELVERSION}" ]; then
 	echo "KERNELVERSION is not set" >&2
 	exit 1
@@ -126,6 +139,16 @@ if test ! "$srctree" -ef .; then
 	file_localversion="${file_localversion}$(collect_files "$srctree"/localversion*)"
 fi
 
+if ${no_local}; then
+	echo "${KERNELVERSION}$(scm_version --no-dirty)"
+	exit 0
+fi
+
+if ! test -e include/config/auto.conf; then
+	echo "Error: kernelrelease not valid - run 'make prepare' to update it" >&2
+	exit 1
+fi
+
 # version string from CONFIG_LOCALVERSION
 config_localversion=$(sed -n 's/^CONFIG_LOCALVERSION=\(.*\)$/\1/p' include/config/auto.conf)