Re: Git-SVN on Cygwin: svn+ssh good, https awkward

From: Matthias Andree <matthias.andree@gmx.de>
Date: Apr 24, 2009, 17:31 UTC
Message-ID: <op.uswiynhl1e62zd@balu.cs.uni-paderborn.de>
In-Reply-To: <20090423190308.GA10437@dcvr.yhbt.net>

Am 23.04.2009, 21:03 Uhr, schrieb Eric Wong <normalperson@yhbt.net>:

Show 18 quoted lines

> Matthias Andree <matthias.andree@gmx.de> wrote:
>> Hi Eric,
>>
>> === Short story ===
>>
>> git-svn on Cygwin works well with svn+ssh://, but needs some fixes  
>> around
>> tempfile and/or subprocess handling for https:// - please help.
>
> Hi Matthias,
>
> Marcus Griep did a lot of work for more efficiently handling of
> tempfiles in Git.pm a few months ago, so maybe he has more insight into
> how things work...
>
> git-svn used to use IO::File->new_tmpfile() which was much simpler and
> probably less prone to portability problems, but cycled through inodes
> too quickly for Marcus (and probably some other people).

I debugged this a bit further, and the damage (i. e. removal of the tempfile) apparently happens in $pool->clear; in line 4355. I single-stepped it, and the apr_pool_clear(...) is the culprit, it unlinks() the tempfile, making this location unusable.

The temp file is generated when the Reporter object is created through $self->do_update in line 4336.

It remains unclear to me who generates the non-unique filename (it's ...\Temp\tempfile.tmp for me), I've not found the code that generates the file names.

Questions:

- How can I either make sure that the temporary file name for the reporter  
gets either a unique name (near line 4336, through SVN::Ra...)

- or is that the temp file truncated, rather than deleted, near line 4355  
(through SVN::Pool::clear)?

- Is there any way to influence how the SVN::Ra::Reporter obtains  
temporary files?
I seem to be unable to trace this down to the actual functions, but then  
again, my perlboot is rather holey...

Any help?

   4132  package Git::SVN::Ra;
   4133  use vars qw/@ISA $config_dir $_log_window_size/;
   4134  use strict;
   4135  use warnings;
   4136  my ($ra_invalid, $can_do_switch, %ignored_err, $RA);
   4137
   ....
   4324  sub gs_do_update {
   4325          my ($self, $rev_a, $rev_b, $gs, $editor) = @_;
   4326          my $new = ($rev_a == $rev_b);
   4327          my $path = $gs->{path};
   4328
   4329          if ($new && -e $gs->{index}) {
   4330                  unlink $gs->{index} or die
   4331                    "Couldn't unlink index: $gs->{index}: $!\n";
   4332          }
   4333          my $pool = SVN::Pool->new;
   4334          $editor->set_path_strip($path);
   4335          my (@pc) = split m#/#, $path;
: 4336          my $reporter = $self->do_update($rev_b, (@pc ? shift @pc :  
''),
   4337                                          1, $editor, $pool);
   4338          my @lock = $SVN::Core::VERSION ge '1.2.0' ? (undef) : ();
   4339
   4340          # Since we can't rely on svn_ra_reparent being available,  
we'll
   4341          # just have to do some magic with set_path to make it so
   4342          # we only want a partial path.
   4343          my $sp = '';
   4344          my $final = join('/', @pc);
   4345          while (@pc) {
   4346                  $reporter->set_path($sp, $rev_b, 0, @lock, $pool);
   4347                  $sp .= '/' if length $sp;
   4348                  $sp .= shift @pc;
   4349          }
   4350          die "BUG: '$sp' != '$final'\n" if ($sp ne $final);
   4351
   4352          $reporter->set_path($sp, $rev_a, $new, @lock, $pool);
   4353
   4354          $reporter->finish_report($pool);
: 4355          $pool->clear;
   4356          $editor->{git_commit_ok};
   4357  }

-- 
Matthias Andree