Commit 09155120 authored by Michal Marek's avatar Michal Marek
Browse files

kbuild: Clean up and speed up the localversion logic 



Now that we run scripts/setlocalversion during every build, it makes
sense to move all the localversion logic there. This cleans up the
toplevel Makefile and also makes sure that the script is called only
once in 'make prepare' (previously, it would be called every time due to
a variable expansion in an ifneq statement). No user-visible change is
intended, unless one runs the setlocalversion script directly.

Reported-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: Nico Schottelius <nico-linuxsetlocalversion@schottelius.org>
Signed-off-by: default avatarMichal Marek <mmarek@suse.cz>
parent fb994ecc

Makefile

+3 −71
Original line number Diff line number Diff line
@@ -883,80 +883,12 @@ PHONY += $(vmlinux-dirs) 
$(vmlinux-dirs): prepare scripts

	$(Q)$(MAKE) $(build)=$@



# Build the kernel release string

#

# The KERNELRELEASE value built here is stored in the file

# include/config/kernel.release, and is used when executing several

# make targets, such as "make install" or "make modules_install."

#

# The eventual kernel release string consists of the following fields,

# shown in a hierarchical format to show how smaller parts are concatenated

# to form the larger and final value, with values coming from places like

# the Makefile, kernel config options, make command line options and/or

# SCM tag information.

#

#	$(KERNELVERSION)

#	  $(VERSION)			eg, 2

#	  $(PATCHLEVEL)			eg, 6

#	  $(SUBLEVEL)			eg, 18

#	  $(EXTRAVERSION)		eg, -rc6

#	$(localver-full)

#	  $(localver)

#	    localversion*		(files without backups, containing '~')

#	    $(CONFIG_LOCALVERSION)	(from kernel config setting)

#	  $(LOCALVERSION)		(from make command line, if provided)

#	  $(localver-extra)

#	    $(scm-identifier)		(unique SCM tag, if one exists)

#	      ./scripts/setlocalversion	(only with CONFIG_LOCALVERSION_AUTO)

#	      .scmversion		(only with CONFIG_LOCALVERSION_AUTO)

#	    +				(only without CONFIG_LOCALVERSION_AUTO

#					 and without LOCALVERSION= and

#					 repository is at non-tagged commit)

#

# For kernels without CONFIG_LOCALVERSION_AUTO compiled from an SCM that has

# been revised beyond a tagged commit, `+' is appended to the version string

# when not overridden by using "make LOCALVERSION=".  This indicates that the

# kernel is not a vanilla release version and has been modified.



pattern = ".*/localversion[^~]*"

string  = $(shell cat /dev/null \

	   `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)



localver = $(subst $(space),, $(string) \

			      $(patsubst "%",%,$(CONFIG_LOCALVERSION)))



# scripts/setlocalversion is called to create a unique identifier if the source

# is managed by a known SCM and the repository has been revised since the last

# tagged (release) commit.  The format of the identifier is determined by the

# SCM's implementation.

#

# .scmversion is used when generating rpm packages so we do not loose

# the version information from the SCM when we do the build of the kernel

# from the copied source

ifeq ($(wildcard .scmversion),)

        scm-identifier = $(shell $(CONFIG_SHELL) \

                         $(srctree)/scripts/setlocalversion $(srctree))

else

        scm-identifier = $(shell cat .scmversion 2> /dev/null)

endif



ifdef CONFIG_LOCALVERSION_AUTO

	localver-extra = $(scm-identifier)

else

	ifneq ($(scm-identifier),)

		ifeq ($(LOCALVERSION),)

			localver-extra = +

		endif

	endif

endif



localver-full = $(localver)$(LOCALVERSION)$(localver-extra)



# Store (new) KERNELRELASE string in include/config/kernel.release

kernelrelease = $(KERNELVERSION)$(localver-full)

localversion = $(shell $(CONFIG_SHELL) \

	       $(srctree)/scripts/setlocalversion $(srctree))

include/config/kernel.release: include/config/auto.conf FORCE

	$(Q)rm -f $@

	$(Q)echo $(kernelrelease) > $@

	$(Q)echo $(KERNELVERSION)$(localversion) > $@





# Things we need to do before we recursively start building the kernel

scripts/package/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -44,7 +44,7 @@ rpm-pkg rpm: $(objtree)/kernel.spec FORCE 
	fi

	$(MAKE) clean

	$(PREV) ln -sf $(srctree) $(KERNELPATH)

	$(CONFIG_SHELL) $(srctree)/scripts/setlocalversion > $(objtree)/.scmversion

	$(CONFIG_SHELL) $(srctree)/scripts/setlocalversion --scm-only > $(objtree)/.scmversion

	$(PREV) tar -cz $(RCS_TAR_IGNORE) -f $(KERNELPATH).tar.gz $(KERNELPATH)/.

	$(PREV) rm $(KERNELPATH)

	rm -f $(objtree)/.scmversion

scripts/setlocalversion

+132 −47
Original line number Diff line number Diff line
@@ -10,21 +10,52 @@ 
#



usage() {

	echo "Usage: $0 [srctree]" >&2

	echo "Usage: $0 [--scm-only] [srctree]" >&2

	exit 1

}



cd "${1:-.}" || usage

scm_only=false

srctree=.

if test "$1" = "--scm-only"; then

	scm_only=true

	shift

fi

if test $# -gt 0; then

	srctree=$1

	shift

fi

if test $# -gt 0 -o ! -d "$srctree"; then

	usage

fi



scm_version()

{

	local short=false



	cd "$srctree"

	if test -e .scmversion; then

		cat "$_"

		return

	fi

	if test "$1" = "--short"; then

		short=true

	fi



	# Check for git and a git repo.

	if head=`git rev-parse --verify --short HEAD 2>/dev/null`; then



	# If we are at a tagged commit (like "v2.6.30-rc6"), we ignore it,

	# because this version is defined in the top level Makefile.

		# If we are at a tagged commit (like "v2.6.30-rc6"), we ignore

		# it, because this version is defined in the top level Makefile.

		if [ -z "`git describe --exact-match 2>/dev/null`" ]; then



		# If we are past a tagged commit (like "v2.6.30-rc5-302-g72357d5"),

		# we pretty print it.

			# If only the short version is requested, don't bother

			# running further git commands

			if $short; then

				echo "+"

				return

			fi

			# If we are past a tagged commit (like

			# "v2.6.30-rc5-302-g72357d5"), we pretty print it.

			if atag="`git describe 2>/dev/null`"; then

				echo "$atag" | awk -F- '{printf("-%05d-%s", $(NF-1),$(NF))}'
@@ -49,7 +80,7 @@ if head=`git rev-parse --verify --short HEAD 2>/dev/null`; then 
		fi



		# All done with git

	exit

		return

	fi



	# Check for mercurial and a mercurial repo.
@@ -69,7 +100,7 @@ if hgid=`hg id 2>/dev/null`; then 
		esac



		# All done with mercurial

	exit

		return

	fi



	# Check for svn and a svn repo.
@@ -78,5 +109,59 @@ if rev=`svn info 2>/dev/null | grep '^Last Changed Rev'`; then 
		printf -- '-svn%s' "$rev"



		# All done with svn

		return

	fi

}



collect_files()

{

	local file res



	for file; do

		case "$file" in

		*\~*)

			continue

			;;

		esac

		if test -e "$file"; then

			res="$res$(cat "$file")"

		fi

	done

	echo "$res"

}



if $scm_only; then

	scm_version

	exit

fi



if test -e include/config/auto.conf; then

	source "$_"

else

	echo "Error: kernelrelease not valid - run 'make prepare' to update it"

	exit 1

fi



# localversion* files in the build and source directory

res="$(collect_files localversion*)"

if test ! "$srctree" -ef .; then

	res="$res$(collect_files "$srctree"/localversion*)"

fi



# CONFIG_LOCALVERSION and LOCALVERSION (if set)

res="${res}${CONFIG_LOCALVERSION}${LOCALVERSION}"



# scm version string if not at a tagged commit

if test "$CONFIG_LOCALVERSION_AUTO" = "y"; then

	# full scm version string

	res="$res$(scm_version)"

else

	# apped a plus sign if the repository is not in a clean tagged

	# state and  LOCALVERSION= is not specified

	if test "${LOCALVERSION+set}" != "set"; then

		scm=$(scm_version --short)

		res="$res${scm:++}"

	fi

fi



echo "$res"

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