scripts/setlocalversion

   1 #!/usr/bin/perl
   2 # Copyright 2004 - Ryan Anderson <ryan@michonline.com>  GPL v2
   3
   4 use strict;
   5 use warnings;
   6 use Digest::MD5;
   7 require 5.006;
   8
   9 if (@ARGV != 1) {
  10         print <<EOT;
  11 Usage: setlocalversion <srctree>
  12 EOT
  13         exit(1);
  14 }
  15
  16 my ($srctree) = @ARGV;
  17 chdir($srctree);
  18
  19 my @LOCALVERSIONS = ();
  20
  21 # We are going to use the following commands to try and determine if this
  22 # repository is at a Version boundary (i.e, 2.6.10 vs 2.6.10 + some patches) We
  23 # currently assume that all meaningful version boundaries are marked by a tag.
  24 # We don't care what the tag is, just that something exists.
  25
  26 # Git/Cogito store the top-of-tree "commit" in .git/HEAD
  27 # A list of known tags sits in .git/refs/tags/
  28 #
  29 # The simple trick here is to just compare the two of these, and if we get a
  30 # match, return nothing, otherwise, return a subset of the SHA-1 hash in
  31 # .git/HEAD
  32
  33 sub do_git_checks {
  34         open(H,"<.git/HEAD") or return;
  35         my $head = <H>;
  36         chomp $head;
  37         close(H);
  38
  39         opendir(D,".git/refs/tags") or return;
  40         foreach my $tagfile (grep !/^\.{1,2}$/, readdir(D)) {
  41                 open(F,"<.git/refs/tags/" . $tagfile) or return;
  42                 my $tag = <F>;
  43                 chomp $tag;
  44                 close(F);
  45                 return if ($tag eq $head);
  46         }
  47         closedir(D);
  48
  49         push @LOCALVERSIONS, "g" . substr($head,0,8);
  50 }
  51
  52 if ( -d ".git") {
  53         do_git_checks();
  54 }
  55
  56 printf "-%s\n", join("-",@LOCALVERSIONS) if (scalar @LOCALVERSIONS > 0);