[PATCH] kbuild: automatically append a short string to the version based upon the git commit

# images. Default is /boot, but you can set it to other values

# images. Default is /boot, but you can set it to other values

export	INSTALL_PATH ?= /boot

export	INSTALL_PATH ?= /boot

# If CONFIG_LOCALVERSION_AUTO is set, we automatically perform some tests

# and try to determine if the current source tree is a release tree, of any sort,

# or if is a pure development tree.

#

# A 'release tree' is any tree with a git TAG associated

# with it.  The primary goal of this is to make it safe for a native

# git/CVS/SVN user to build a release tree (i.e, 2.6.9) and also to

# continue developing against the current Linus tree, without having the Linus

# tree overwrite the 2.6.9 tree when installed.

#

# Currently, only git is supported.

# Other SCMs can edit scripts/setlocalversion and add the appropriate

# checks as needed.

ifdef CONFIG_LOCALVERSION_AUTO

	localversion-auto := $(shell $(PERL) $(srctree)/scripts/setlocalversion $(srctree))

	LOCALVERSION := $(LOCALVERSION)$(localversion-auto)

endif

#

#

# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory

# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory

# relocations required by build roots.  This is not defined in the

# relocations required by build roots.  This is not defined in the

	  object and source tree, in that order.  Your total string can

	  object and source tree, in that order.  Your total string can

	  be a maximum of 64 characters.

	  be a maximum of 64 characters.

config LOCALVERSION_AUTO

	bool "Automatically append version information to the version string"

	default y

	help

	  This will try to automatically determine if the current tree is a

	  release tree by looking for git tags that

	  belong to the current top of tree revision.

	  A string of the format -gxxxxxxxx will be added to the localversion

	  if a git based tree is found.  The string generated by this will be

	  appended after any matching localversion* files, and after the value

	  set in CONFIG_LOCALVERSION

	  Note: This requires Perl, and a git repository, but not necessarily

	  the git or cogito tools to be installed.

config SWAP

config SWAP

	bool "Support for paging of anonymous memory (swap)"

	bool "Support for paging of anonymous memory (swap)"

	depends on MMU

	depends on MMU

#!/usr/bin/perl

# Copyright 2004 - Ryan Anderson <ryan@michonline.com>  GPL v2

use strict;

use warnings;

use Digest::MD5;

require 5.006;

if (@ARGV != 1) {

	print <<EOT;

Usage: setlocalversion <srctree>

EOT

	exit(1);

}

my ($srctree) = @ARGV;

chdir($srctree);

my @LOCALVERSIONS = ();

# We are going to use the following commands to try and determine if this

# repository is at a Version boundary (i.e, 2.6.10 vs 2.6.10 + some patches) We

# currently assume that all meaningful version boundaries are marked by a tag.

# We don't care what the tag is, just that something exists.

# Git/Cogito store the top-of-tree "commit" in .git/HEAD

# A list of known tags sits in .git/refs/tags/

#

# The simple trick here is to just compare the two of these, and if we get a

# match, return nothing, otherwise, return a subset of the SHA-1 hash in

# .git/HEAD

sub do_git_checks {

	open(H,"<.git/HEAD") or return;

	my $head = <H>;

	chomp $head;

	close(H);

	opendir(D,".git/refs/tags") or return;

	foreach my $tagfile (grep !/^\.{1,2}$/, readdir(D)) {

		open(F,"<.git/refs/tags/" . $tagfile) or return;

		my $tag = <F>;

		chomp $tag;

		close(F);

		return if ($tag eq $head);

	}

	closedir(D);

	push @LOCALVERSIONS, "g" . substr($head,0,8);

}

if ( -d ".git") {

	do_git_checks();

}

printf "-%s\n", join("-",@LOCALVERSIONS) if (scalar @LOCALVERSIONS > 0);