[PATCH v4 4/6] kbuild: srcrpm-pkg: create source package without cleaning

[Masahiro Yamada <masahiroy@kernel.org>]

If you run 'make (src)rpm-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, the .config was contained in the source tarball.

With this commit, the source rpm consists of separate linux.tar.gz
and .config.

Remove stale comments. Now, 'make (src)rpm-pkg' works with O= option.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---

Changes in v4:
  - Do not delete the old tar command because it is still used
    by snap-pkg although snap-pkg is broken, and it does not work at all.

 scripts/Makefile.package | 29 +++--------------------------
 scripts/package/mkspec   |  8 ++++----
 2 files changed, 7 insertions(+), 30 deletions(-)

diff --git a/scripts/Makefile.package b/scripts/Makefile.package
index ebf3db81b994..6732632a0259 100644
--- a/scripts/Makefile.package
+++ b/scripts/Makefile.package
@@ -3,27 +3,6 @@
 
 include $(srctree)/scripts/Kbuild.include
 
-# RPM target
-# ---------------------------------------------------------------------------
-# The rpm target generates two rpm files:
-# /usr/src/packages/SRPMS/kernel-2.6.7rc2-1.src.rpm
-# /usr/src/packages/RPMS/i386/kernel-2.6.7rc2-1.<arch>.rpm
-# The src.rpm files includes all source for the kernel being built
-# The <arch>.rpm includes kernel configuration, modules etc.
-#
-# Process to create the rpm files
-# a) clean the kernel
-# b) Generate .spec file
-# c) Build a tar ball, using symlink to make kernel version
-#    first entry in the path
-# d) and pack the result to a tar.gz file
-# e) generate the rpm files, based on kernel.spec
-# - Use /. to avoid tar packing just the symlink
-
-# Note that the rpm-pkg target cannot be used with KBUILD_OUTPUT,
-# but the binrpm-pkg target can; for some reason O= gets ignored.
-
-# Remove hyphens since they have special meaning in RPM filenames
 KERNELPATH := kernel-$(subst -,_,$(KERNELRELEASE))
 KDEB_SOURCENAME ?= linux-upstream
 KBUILD_PKG_ROOTCMD ?="fakeroot -u"
@@ -87,12 +66,10 @@ rpm-pkg: srcrpm-pkg
 # srcrpm-pkg
 # ---------------------------------------------------------------------------
 PHONY += srcrpm-pkg
-srcrpm-pkg:
-	$(MAKE) clean
+srcrpm-pkg: linux.tar.gz
 	$(CONFIG_SHELL) $(MKSPEC) >$(objtree)/kernel.spec
-	$(call cmd,src_tar,$(KERNELPATH),kernel.spec)
-	+rpmbuild $(RPMOPTS) --target $(UTS_MACHINE)-linux -ts $(KERNELPATH).tar.gz \
-	--define='_smp_mflags %{nil}' --define='_srcrpmdir $(srctree)'
+	+rpmbuild $(RPMOPTS) --target $(UTS_MACHINE)-linux -bs kernel.spec \
+	--define='_smp_mflags %{nil}' --define='_sourcedir .' --define='_srcrpmdir .'
 
 # binrpm-pkg
 # ---------------------------------------------------------------------------
diff --git a/scripts/package/mkspec b/scripts/package/mkspec
index 108c0cb95436..83a64d9d7372 100755
--- a/scripts/package/mkspec
+++ b/scripts/package/mkspec
@@ -47,7 +47,8 @@ sed -e '/^DEL/d' -e 's/^\t*//' <<EOF
 	Group: System Environment/Kernel
 	Vendor: The Linux Community
 	URL: https://www.kernel.org
-$S	Source: kernel-$__KERNELRELEASE.tar.gz
+$S	Source0: linux.tar.gz
+$S	Source1: .config
 	Provides: $PROVIDES
 $S	BuildRequires: bc binutils bison dwarves
 $S	BuildRequires: (elfutils-libelf-devel or libelf-devel) flex
@@ -83,9 +84,8 @@ $S$M	This package provides kernel headers and makefiles sufficient to build modu
 $S$M	against the $__KERNELRELEASE kernel package.
 $S$M
 $S	%prep
-$S	%setup -q
-$S	rm -f scripts/basic/fixdep scripts/kconfig/conf
-$S	rm -f tools/objtool/{fixdep,objtool}
+$S	%setup -q -n linux
+$S	cp %{SOURCE1} .
 $S
 $S	%build
 $S	$MAKE %{?_smp_mflags} KERNELRELEASE=$KERNELRELEASE KBUILD_BUILD_VERSION=%{release}
-- 
2.34.1