Commit aaebf433 authored by Ryan Anderson's avatar Ryan Anderson Committed by Sam Ravnborg
Browse files

[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: default avatarRyan Anderson <>
Signed-off-by: default avatarSam Ravnborg <>
parent dbec4866
......@@ -548,6 +548,26 @@ export KBUILD_IMAGE ?= vmlinux
# images. Default is /boot, but you can set it to other values
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.
localversion-auto := $(shell $(PERL) $(srctree)/scripts/setlocalversion $(srctree))
LOCALVERSION := $(LOCALVERSION)$(localversion-auto)
# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
# relocations required by build roots. This is not defined in the
......@@ -77,6 +77,22 @@ config LOCALVERSION
object and source tree, in that order. Your total string can
be a maximum of 64 characters.
bool "Automatically append version information to the version string"
default y
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
Note: This requires Perl, and a git repository, but not necessarily
the git or cogito tools to be installed.
config SWAP
bool "Support for paging of anonymous memory (swap)"
depends on MMU
# Copyright 2004 - Ryan Anderson <> GPL v2
use strict;
use warnings;
use Digest::MD5;
require 5.006;
if (@ARGV != 1) {
print <<EOT;
Usage: setlocalversion <srctree>
my ($srctree) = @ARGV;
# 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;
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 $tag;
return if ($tag eq $head);
push @LOCALVERSIONS, "g" . substr($head,0,8);
if ( -d ".git") {
printf "-%s\n", join("-",@LOCALVERSIONS) if (scalar @LOCALVERSIONS > 0);
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