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Ryan Anderson aaebf43320 [PATCH] kbuild: automatically append a short string to the version based upon the git commit

If CONFIG_AUTO_LOCALVERSION is set, the user is using a git-based tree, and the
current HEAD is not referred to by any tags in .git/refs/tags/, append -g and
the first 8 characters of the commit to the version string.  This makes it
easier to use git-bisect, and/or to do a daily build, without trampling on your
older, working builds, or accidentally setting up conflicting sets of modules.

Signed-off-by: Ryan Anderson <ryan@michonline.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

2005-08-10 21:11:23 +02:00

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#!/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 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 = ; 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);

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