kernel/scripts/merge.pl

   1 #! /usr/bin/perl
   2
   3 my @args=@ARGV;
   4 my %configvalues;
   5 my @configoptions;
   6 my $configcounter = 0;
   7
   8 # optionally print out the architecture as the first line of our output
   9 my $arch = $args[2];
  10 if (defined $arch) {
  11         print "# $arch\n";
  12 }
  13
  14 # first, read the override file
  15
  16 open (FILE,"$args[0]") || die "Could not open $args[0]";
  17 while (<FILE>) {
  18         my $str = $_;
  19         my $configname;
  20
  21         if (/\# ([\w]+) is not set/) {
  22                 $configname = $1;
  23         } elsif (/([\w]+)=/) {
  24                 $configname = $1;
  25         }
  26
  27         if (defined($configname) && !exists($configvalues{$configname})) {
  28                 $configvalues{$configname} = $str;
  29                 $configoptions[$configcounter] = $configname;
  30                 $configcounter ++;
  31         }
  32 };
  33
  34 # now, read and output the entire configfile, except for the overridden
  35 # parts... for those the new value is printed.
  36
  37 open (FILE2,"$args[1]") || die "Could not open $args[1]";
  38 while (<FILE2>) {
  39         my $configname;
  40
  41         if (/\# ([\w]+) is not set/) {
  42                 $configname = $1;
  43         } elsif (/([\w]+)=/) {
  44                 $configname  = $1;
  45         }
  46
  47         if (defined($configname) && exists($configvalues{$configname})) {
  48                 print "$configvalues{$configname}";
  49                 delete($configvalues{$configname});
  50         } else {
  51                 print "$_";
  52         }
  53 }
  54
  55 # now print the new values from the overridden configfile
  56 my $counter = 0;
  57
  58 while ($counter < $configcounter) {
  59         my $configname = $configoptions[$counter];
  60         if (exists($configvalues{$configname})) {
  61                 print "$configvalues{$configname}";
  62         }
  63         $counter++;
  64 }
  65
  66 1;