crypto/openssl/util/mklink.pl

   1 #!/usr/local/bin/perl
   2
   3 # mklink.pl
   4
   5 # The first command line argument is a non-empty relative path
   6 # specifying the "from" directory.
   7 # Each other argument is a file name not containing / and
   8 # names a file in the current directory.
   9 #
  10 # For each of these files, we create in the "from" directory a link
  11 # of the same name pointing to the local file.
  12 #
  13 # We assume that the directory structure is a tree, i.e. that it does
  14 # not contain symbolic links and that the parent of / is never referenced.
  15 # Apart from this, this script should be able to handle even the most
  16 # pathological cases.
  17
  18 use Cwd;
  19
  20 my $from = shift;
  21 my @files = @ARGV;
  22
  23 my @from_path = split(/[\\\/]/, $from);
  24 my $pwd = getcwd();
  25 chomp($pwd);
  26 my @pwd_path = split(/[\\\/]/, $pwd);
  27
  28 my @to_path = ();
  29
  30 my $dirname;
  31 foreach $dirname (@from_path) {
  32
  33     # In this loop, @to_path always is a relative path from
  34     # @pwd_path (interpreted is an absolute path) to the original pwd.
  35
  36     # At the end, @from_path (as a relative path from the original pwd)
  37     # designates the same directory as the absolute path @pwd_path,
  38     # which means that @to_path then is a path from there to the original pwd.
  39
  40     next if ($dirname eq "" || $dirname eq ".");
  41
  42     if ($dirname eq "..") {
  43         @to_path = (pop(@pwd_path), @to_path);
  44     } else {
  45         @to_path = ("..", @to_path);
  46         push(@pwd_path, $dirname);
  47     }
  48 }
  49
  50 my $to = join('/', @to_path);
  51
  52 my $file;
  53 $symlink_exists=eval {symlink("",""); 1};
  54 foreach $file (@files) {
  55     my $err = "";
  56     if ($symlink_exists) {
  57         unlink "$from/$file";
  58         symlink("$to/$file", "$from/$file") or $err = " [$!]";
  59     } else {
  60         unlink "$from/$file";
  61         open (OLD, "<$file") or die "Can't open $file: $!";
  62         open (NEW, ">$from/$file") or die "Can't open $from/$file: $!";
  63         binmode(OLD);
  64         binmode(NEW);
  65         while (<OLD>) {
  66             print NEW $_;
  67         }
  68         close (OLD) or die "Can't close $file: $!";
  69         close (NEW) or die "Can't close $from/$file: $!";
  70     }
  71     print $file . " => $from/$file$err\n";
  72 }