build binary rpm from pre-built tree

@@ -31,7 +31,7 @@
 MKSPEC     := $(srctree)/scripts/package/mkspec
 PREV       := set -e; cd ..;
 
-.PHONY: rpm-pkg rpm
+.PHONY: rpm-pkg rpm rpmbin-pkg
 
 $(objtree)/kernel.spec: $(MKSPEC)
 	$(CONFIG_SHELL) $(MKSPEC) > $@

@@ -49,6 +49,16 @@
 
 	$(RPM) --target $(UTS_MACHINE) -ta ../$(KERNELPATH).tar.gz
 	rm ../$(KERNELPATH).tar.gz
+
+rpmbin-pkg: $(MKSPEC)
+	$(CONFIG_SHELL) $(MKSPEC) prebuilt > $(objtree)/kernel.spec
+
+	set -e; \
+	$(CONFIG_SHELL) $(srctree)/scripts/mkversion > $(objtree)/.tmp_version
+	set -e; \
+	mv -f $(objtree)/.tmp_version $(objtree)/.version
+
+	$(RPM) --define "_builddir $(srctree)" --target $(UTS_MACHINE) -bb $(objtree)/kernel.spec
 
 clean-rule +=  rm -f $(objtree)/kernel.spec
 

@@ -9,6 +9,13 @@
 #	Patched for non-x86 by Opencon (L) 2002 <[email protected]>
 #
 
+# how we were called determines which rpms we build and how we build them
+if [ "$1" = "prebuilt" ]; then
+	PREBUILT=true
+else
+	PREBUILT=false
+fi
+
 # starting to output the spec
 if [ "`grep CONFIG_DRM=y .config | cut -f2 -d\=`" = "y" ]; then
 	PROVIDES=kernel-drm

@@ -26,8 +33,12 @@
 echo "Group: System Environment/Kernel"
 echo "Vendor: The Linux Community"
 echo "URL: http://www.kernel.org"
+
+if ! $PREBUILT; then
 echo -n "Source: kernel-$VERSION.$PATCHLEVEL.$SUBLEVEL"
 echo "$EXTRAVERSION.tar.gz" | sed -e "s/-//g"
+fi
+
 echo "BuildRoot: /var/tmp/%{name}-%{PACKAGE_VERSION}-root"
 echo "Provides: $PROVIDES"
 echo "%define __spec_install_post /usr/lib/rpm/brp-compress || :"

@@ -36,12 +47,20 @@
 echo "%description"
 echo "The Linux Kernel, the operating system core itself"
 echo ""
+
+if ! $PREBUILT; then
 echo "%prep"
 echo "%setup -q"
 echo ""
+fi
+
 echo "%build"
+
+if ! $PREBUILT; then
 echo "make clean && make"
 echo ""
+fi
+
 echo "%install"
 echo 'mkdir -p $RPM_BUILD_ROOT/boot $RPM_BUILD_ROOT/lib $RPM_BUILD_ROOT/lib/modules'