kbuild: refactor kernel-devel RPM package and linux-headers Deb package

The kernel-devel RPM package and the linux-headers Debian package
provide headers and scripts needed for building external modules.

They copy the necessary files in slightly different ways - the RPM
copies almost everything except some exclude patterns, while the Debian
copies less number of files. There is no need to maintain different code
to do the same thing.

Split the Debian code out to scripts/package/install-extmod-build, which
is called from both of the packages.

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

3 files changed, 41 insertions, 33 deletions

diff --git a/scripts/package/builddeb b/scripts/package/builddeb
index 032774eb061e..bf3f8561aa68 100755
--- a/scripts/package/builddeb
+++ b/scripts/package/builddeb
@@ -162,34 +162,7 @@ install_kernel_headers () {
 
 	rm -rf $pdir
 
-	(
-		cd $srctree
-		find . arch/$SRCARCH -maxdepth 1 -name Makefile\*
-		find include scripts -type f -o -type l
-		find arch/$SRCARCH -name Kbuild.platforms -o -name Platform
-		find $(find arch/$SRCARCH -name include -o -name scripts -type d) -type f
-	) > debian/hdrsrcfiles
-
-	{
-		if is_enabled CONFIG_OBJTOOL; then
-			echo tools/objtool/objtool
-		fi
-
-		find arch/$SRCARCH/include Module.symvers include scripts -type f
-
-		if is_enabled CONFIG_GCC_PLUGINS; then
-			find scripts/gcc-plugins -name \*.so
-		fi
-	} > debian/hdrobjfiles
-
-	destdir=$pdir/usr/src/linux-headers-$version
-	mkdir -p $destdir
-	tar -c -f - -C $srctree -T debian/hdrsrcfiles | tar -xf - -C $destdir
-	tar -c -f - -T debian/hdrobjfiles | tar -xf - -C $destdir
-	rm -f debian/hdrsrcfiles debian/hdrobjfiles
-
-	# copy .config manually to be where it's expected to be
-	cp $KCONFIG_CONFIG $destdir/.config
+	"${srctree}/scripts/package/install-extmod-build" "${pdir}/usr/src/linux-headers-${version}"
 
 	mkdir -p $pdir/lib/modules/$version/
 	ln -s /usr/src/linux-headers-$version $pdir/lib/modules/$version/build
diff --git a/scripts/package/install-extmod-build b/scripts/package/install-extmod-build
new file mode 100755
index 000000000000..af7fe9f5b1e4
--- /dev/null
+++ b/scripts/package/install-extmod-build
@@ -0,0 +1,39 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-only
+
+set -e
+
+destdir=${1}
+
+test -n "${srctree}"
+test -n "${SRCARCH}"
+
+is_enabled() {
+	grep -q "^$1=y" include/config/auto.conf
+}
+
+mkdir -p "${destdir}"
+
+(
+	cd "${srctree}"
+	echo Makefile
+	find "arch/${SRCARCH}" -maxdepth 1 -name 'Makefile*'
+	find include scripts -type f -o -type l
+	find "arch/${SRCARCH}" -name Kbuild.platforms -o -name Platform
+	find "$(find "arch/${SRCARCH}" -name include -o -name scripts -type d)" -type f
+) | tar -c -f - -C "${srctree}" -T - | tar -xf - -C "${destdir}"
+
+{
+	if is_enabled CONFIG_OBJTOOL; then
+		echo tools/objtool/objtool
+	fi
+
+	find "arch/${SRCARCH}/include" Module.symvers include scripts -type f
+
+	if is_enabled CONFIG_GCC_PLUGINS; then
+		find scripts/gcc-plugins -name '*.so'
+	fi
+} | tar -c -f - -T - | tar -xf - -C "${destdir}"
+
+# copy .config manually to be where it's expected to be
+cp "${KCONFIG_CONFIG}" "${destdir}/.config"
diff --git a/scripts/package/mkspec b/scripts/package/mkspec
index 34b2489106cf..22e290d23d8a 100755
--- a/scripts/package/mkspec
+++ b/scripts/package/mkspec
@@ -28,9 +28,6 @@ else
 fi
 
 __KERNELRELEASE=$(echo $KERNELRELEASE | sed -e "s/-/_/g")
-EXCLUDES="$RCS_TAR_IGNORE --exclude=*vmlinux* --exclude=*.mod \
---exclude=*.o --exclude=*.ko --exclude=*.cmd --exclude=Documentation \
---exclude=.config.old --exclude=.missing-syscalls.d --exclude=*.s"
 
 # We can label the here-doc lines for conditional output to the spec file
 #
@@ -112,8 +109,7 @@ $M	%{make} %{makeflags} INSTALL_MOD_PATH=%{buildroot} modules_install
 	cp .config %{buildroot}/boot/config-%{KERNELRELEASE}
 $S$M	rm -f %{buildroot}/lib/modules/%{KERNELRELEASE}/build
 $S$M	rm -f %{buildroot}/lib/modules/%{KERNELRELEASE}/source
-$S$M	mkdir -p %{buildroot}/usr/src/kernels/%{KERNELRELEASE}
-$S$M	tar cf - $EXCLUDES . | tar xf - -C %{buildroot}/usr/src/kernels/%{KERNELRELEASE}
+$S$M	%{make} %{makeflags} run-command KBUILD_RUN_COMMAND='\${srctree}/scripts/package/install-extmod-build %{buildroot}/usr/src/kernels/%{KERNELRELEASE}'
 $S$M	cd %{buildroot}/lib/modules/%{KERNELRELEASE}
 $S$M	ln -sf /usr/src/kernels/%{KERNELRELEASE} build
 $S$M	ln -sf /usr/src/kernels/%{KERNELRELEASE} source