svn_load_dirs.pl for Win32 (was RE: svn_dump_dirs problem)

Hi Jack (and everyone else),

I've now got svn_load_dirs.pl working on Windows.

I had to make the following changes:
 * open(HANDLE, "-|"); doesn't work on Windows. I replaced it with
   open(HANDLE, "@commandline |"); on Windows ($^O eq "MSWin32").
 * Windows chokes on the multi-line commands caused by comments.
   I write the comment parameter to a file and use --file instead
   of -m.
 * Windows doesn't define TMPDIR by default. It does define TEMP,
   so I use that if TMPDIR isn't found.

Here's the patch. I've tested it on both Windows XP and Linux (with a
very simple import with one rename). I attach the updated file.

Index:
http://svn.collab.net/repos/svn/trunk/contrib/client-side/svn_load_dirs.
pl.in
===================================================================

---
http://svn.collab.net/repos/svn/trunk/contrib/client-side/svn_load_dirs.
pl.in	(revision 9503)
+++
http://svn.collab.net/repos/svn/trunk/contrib/client-side/svn_load_dirs.
pl.in	(working copy)
@@ -14,7 +14,7 @@
 use File::Copy   2.03;
 use File::Find;
 use File::Path   1.0404;
-use File::Temp   0.12   qw(tempdir);
+use File::Temp   0.12   qw(tempdir tempfile);
 use Getopt::Long 2.25;
 use Text::Wrap;
 use URI          1.17;
@@ -341,6 +341,10 @@
 # Create a temporary directory for svn to work in.
 my $temp_dir = $ENV{TMPDIR};
 unless (defined $temp_dir and length $temp_dir) {
+  # Try the Windows standard environment variable
+  $temp_dir = $ENV{TEMP};
+}
+unless (defined $temp_dir and length $temp_dir) {
   $temp_dir = '/tmp';
 }
 my $temp_template = "$temp_dir/svn_load_dirs_XXXXXXXXXX";
@@ -1411,6 +1415,7 @@
 }
 
 # Start a child process safely without using /bin/sh.
+my $openfork_available = "MSWin32" ne $^O;
 sub safe_read_from_pipe
 {
   unless (@_)
@@ -1418,18 +1423,58 @@
       croak "$0: safe_read_from_pipe $INCORRECT_NUMBER_OF_ARGS";
     }
   print "Running @_\n";
-  my $pid = open(SAFE_READ, '-|');
-  unless (defined $pid)
+
+  if ($openfork_available)
     {
-      die "$0: cannot fork: $!\n";
+      my $pid = open(SAFE_READ, "-|");
+      unless (defined $pid)
+        {
+          die "$0: cannot fork: $!\n";
+        }
+      unless ($pid)
+        {
+          # child
+          open(STDERR, ">&STDOUT")
+            or die "$0: cannot dup STDOUT: $!\n";
+          exec(@_)
+            or die "$0: cannot exec '@_': $!\n";
+        }
     }
-  unless ($pid)
+  else
     {
-      open(STDERR, ">&STDOUT")
-        or die "$0: cannot dup STDOUT: $!\n";
-      exec(@_)
-        or die "$0: cannot exec '@_': $!\n";
-  }
+      # Redirect the comment into a temp file and use that to work
around
+      # Windoze's (non-)handling of multi-line commands.
+      my @commandline = ();
+      my $command;
+        
+      while ($command = shift)
+        {
+          if ("-m" eq $command)
+            {
+              my $comment = shift;
+              my ($handle, $tmpfile) = tempfile( DIR => $temp_dir);
+              print $handle $comment;
+              close($handle);
+                
+              push(@commandline, "--file");
+              push(@commandline, $tmpfile);
+            }
+          else
+            {
+              if ($command =~ m"\n")
+                {
+                  warn "$0: carriage return detected in command - may
not work\n";
+                }
+              push(@commandline, $command);
+            }
+        }
+        
+      # Now do the pipe.
+      open(SAFE_READ, "@commandline |")
+        or die "$0: cannot pipe to command: $!\n";
+    }
+    
+  # parent
   my @output;
   while (<SAFE_READ>)
     {
===================================================================
Cheers,
Ian Brockbank
Senior Applications Software Engineer
e: ian.brockbank@wolfsonmicro.com / apps@wolfsonmicro.com
scd: ian@scottishdance.net
t: +44 131 272 7145
f: +44 131 272 7001

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