[PATCH resend 1/2] scripts/package: add ROOTCMD variable

[Jonathan Nieder <jrnieder@gmail.com>]

Allow "make foo-pkg" to acquire root or fake root privileges before
running commands that need it.  This is especially important for
tar-pkg, since otherwise if a user forgets to run make as root, the
installed kernel will have that user as owner and can easily be
overwritten by a broken program running as that user later.

The new ROOTCMD variable, if defined, is used as a command to run
other commands with possibly fake elevated privileges.  If it is not
defined, the behavior is as before, and hopefully make is running as
root already.

In other words, as a shortcut, instead of running

$ make oldconfig &&
> make &&
> fakeroot -u make rpm-pkg

now one can use a single command:

$ make oldconfig rpm-pkg ROOTCMD="fakeroot -u"

Idea from Ryan Anderson
<http://thread.gmane.org/gmane.comp.version-control.git/14770/focus=14802>.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
---
Changes from v1: rebased on top of current torvalds/master.

 scripts/package/Makefile |   13 +++++++------
 1 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/scripts/package/Makefile b/scripts/package/Makefile
index f67cc88..14b65a8 100644
--- a/scripts/package/Makefile
+++ b/scripts/package/Makefile
@@ -53,7 +53,8 @@ rpm-pkg rpm: $(objtree)/kernel.spec FORCE
 	set -e; \
 	mv -f $(objtree)/.tmp_version $(objtree)/.version
 
-	$(RPM) $(RPMOPTS) --target $(UTS_MACHINE) -ta ../$(KERNELPATH).tar.gz
+	$(ROOTCMD) $(RPM) $(RPMOPTS) --target $(UTS_MACHINE) \
+		-ta ../$(KERNELPATH).tar.gz
 	rm ../$(KERNELPATH).tar.gz
 
 clean-files := $(objtree)/kernel.spec
@@ -70,8 +71,8 @@ binrpm-pkg: $(objtree)/binkernel.spec FORCE
 	set -e; \
 	mv -f $(objtree)/.tmp_version $(objtree)/.version
 
-	$(RPM) $(RPMOPTS) --define "_builddir $(objtree)" --target \
-		$(UTS_MACHINE) -bb $<
+	$(ROOTCMD) $(RPM) $(RPMOPTS) --define "_builddir $(objtree)" \
+		--target $(UTS_MACHINE) -bb $<
 
 clean-files += $(objtree)/binkernel.spec
 
@@ -79,7 +80,7 @@ clean-files += $(objtree)/binkernel.spec
 # ---------------------------------------------------------------------------
 deb-pkg: FORCE
 	$(MAKE) KBUILD_SRC=
-	$(CONFIG_SHELL) $(srctree)/scripts/package/builddeb
+	$(ROOTCMD) $(CONFIG_SHELL) $(srctree)/scripts/package/builddeb
 
 clean-dirs += $(objtree)/debian/
 
@@ -88,7 +89,7 @@ clean-dirs += $(objtree)/debian/
 # ---------------------------------------------------------------------------
 tar%pkg: FORCE
 	$(MAKE) KBUILD_SRC=
-	$(CONFIG_SHELL) $(srctree)/scripts/package/buildtar $@
+	$(ROOTCMD) $(CONFIG_SHELL) $(srctree)/scripts/package/buildtar $@
 
 clean-dirs += $(objtree)/tar-install/
 
@@ -96,10 +97,10 @@ clean-dirs += $(objtree)/tar-install/
 # Help text displayed when executing 'make help'
 # ---------------------------------------------------------------------------
 help: FORCE
+	@echo ' Set ROOTCMD={sudo|fakeroot -u|super|...} and make as non-root:'
 	@echo '  rpm-pkg         - Build both source and binary RPM kernel packages'
 	@echo '  binrpm-pkg      - Build only the binary kernel package'
 	@echo '  deb-pkg         - Build the kernel as an deb package'
 	@echo '  tar-pkg         - Build the kernel as an uncompressed tarball'
 	@echo '  targz-pkg       - Build the kernel as a gzip compressed tarball'
 	@echo '  tarbz2-pkg      - Build the kernel as a bzip2 compressed tarball'
-
-- 
1.6.5.rc1.199.g596ec