Perl script to store/extract symlinks from .cvslinks files

Symlinks are not storable to CVS repository!
[cs_CZ] Perl script pro ukladani/obnovovani symlinku z .cvslinks souboru
Symlinky nelze ukladat do CVS repository!

diff --git a/bin/cvslinks b/bin/cvslinks
new file mode 100755 (executable)
index 0000000..c96248e
--- /dev/null
+++ b/bin/cvslinks
@@ -0,0 +1,125 @@
+#! /usr/bin/perl
+
+use strict;
+use warnings;
+
+use Getopt::Std;
+use Cwd;
+
+use constant FILENAME=>".cvslinks";
+use constant ENTRIES=>"CVS/Entries";
+
+
+our($opt_u,$opt_c,$opt_d,$opt_r,$opt_R,$opt_l,$opt_v);
+getopts "ucdrRlv";
+
+die "-u (update), -c (commit) or -R (delete) required"        if !$opt_u && !$opt_c && !$opt_d;
+die "-r (recursive)/-R (recursive w/o CVS) and -l (local) are conflicting"
+               if ($opt_r || $opt_R) && $opt_l;
+
+$opt_r=1 if !$opt_r && !$opt_R && !$opt_l; # default
+
+body();
+exit 0;
+
+sub body
+{
+       do_u() if $opt_u;
+       do_c() if $opt_c;
+       do_d() if $opt_d;
+       do_r() if $opt_r;
+       do_R() if $opt_R;
+}
+
+sub verbose
+{
+my($msg)=@_;
+
+       return if !$opt_v;
+       print cwd().": $msg\n";
+}
+
+sub do_d
+{
+       local *D;
+       opendir D,"." or die "Cannot open directory \".\": $!";
+       for (readdir D) {
+               next if ! -l;
+               verbose "Deleting local link $_";
+               unlink;
+               }
+       closedir D;
+}
+
+sub do_u
+{
+       local *L;
+       open L,FILENAME or die "File ".FILENAME." cannot be opened: $!";
+       do_d();
+       verbose "Creating links from ".FILENAME;
+       while (<L>) {
+               chomp;
+               next if /^$/; # empty-file (->empty-dir) stub line
+               /^(.+)\t(.+)$/ or warn "Unrecognized line: $_";
+               verbose "Creating link $1";
+               symlink $2,$1 or warn "symlink(\"$2\"->\"$1\"): $!";
+               }
+       close L;
+}
+
+sub do_c
+{
+       local(*L,*D);
+       opendir D,"." or die "Cannot open directory \".\": $!";
+       open L,">".FILENAME or die "File ".FILENAME." cannot be created: $!";
+       verbose "Storing links to ".FILENAME;
+       print L "\n"; # empty-file (->empty-dir) stub line
+       for (readdir D) {
+               next if ! -l;
+               my $target=readlink or die "Cannot read link $_: $!";
+               verbose "Storing link $_";
+               print L "$_\t$target\n";
+               }
+       closedir D;
+}
+
+sub descent
+{
+my($dir)=@_;
+
+       if (!chdir $dir) {
+               warn "Cannot chdir to $dir: $!";
+               return;
+               }
+       verbose "Descented to child directory";
+       body();
+       chdir ".." or die "Cannot return back to ..: $!";
+       verbose "Back in parent directory";
+}
+
+sub do_r
+{
+       local *C;
+       if (!open C,ENTRIES) {
+               warn "Cannot open file \"".ENTRIES."\": $!";
+               return;
+               }
+       while (<C>) {
+               chomp;
+               next if !m#^D/([^/]*)/#;
+               descent($1);
+               }
+       close C;
+}
+
+sub do_R
+{
+       local *D;
+       opendir D,"." or die "Cannot open directory \".\": $!";
+       for (readdir D) {
+               # Beware of symlinked-directories !
+               next if -l || ! -d || $_ eq "." || $_ eq "..";
+               descent($_);
+               }
+       closedir D;
+}