perl/Git/SVN/Ra.pm

   1 package Git::SVN::Ra;
   2 use vars qw/@ISA $config_dir $_ignore_refs_regex $_log_window_size/;
   3 use strict;
   4 use warnings;
   5 use Memoize;
   6 use SVN::Client;
   7 use Git::SVN::Utils qw(
   8         canonicalize_url
   9         canonicalize_path
  10         add_path_to_url
  11 );
  12
  13 use SVN::Ra;
  14 BEGIN {
  15         @ISA = qw(SVN::Ra);
  16 }
  17
  18 my ($ra_invalid, $can_do_switch, %ignored_err, $RA);
  19
  20 BEGIN {
  21         # enforce temporary pool usage for some simple functions
  22         no strict 'refs';
  23         for my $f (qw/rev_proplist get_latest_revnum get_uuid get_repos_root
  24                       get_file/) {
  25                 my $SUPER = "SUPER::$f";
  26                 *$f = sub {
  27                         my $self = shift;
  28                         my $pool = SVN::Pool->new;
  29                         my @ret = $self->$SUPER(@_,$pool);
  30                         $pool->clear;
  31                         wantarray ? @ret : $ret[0];
  32                 };
  33         }
  34 }
  35
  36 # serf has a bug that leads to a coredump upon termination if the
  37 # remote access object is left around (not fixed yet in serf 1.3.1).
  38 # Explicitly free it to work around the issue.
  39 END {
  40         $RA = undef;
  41         $ra_invalid = 1;
  42 }
  43
  44 sub _auth_providers () {
  45         my @rv = (
  46           SVN::Client::get_simple_provider(),
  47           SVN::Client::get_ssl_server_trust_file_provider(),
  48           SVN::Client::get_simple_prompt_provider(
  49             \&Git::SVN::Prompt::simple, 2),
  50           SVN::Client::get_ssl_client_cert_file_provider(),
  51           SVN::Client::get_ssl_client_cert_prompt_provider(
  52             \&Git::SVN::Prompt::ssl_client_cert, 2),
  53           SVN::Client::get_ssl_client_cert_pw_file_provider(),
  54           SVN::Client::get_ssl_client_cert_pw_prompt_provider(
  55             \&Git::SVN::Prompt::ssl_client_cert_pw, 2),
  56           SVN::Client::get_username_provider(),
  57           SVN::Client::get_ssl_server_trust_prompt_provider(
  58             \&Git::SVN::Prompt::ssl_server_trust),
  59           SVN::Client::get_username_prompt_provider(
  60             \&Git::SVN::Prompt::username, 2)
  61         );
  62
  63         # earlier 1.6.x versions would segfault, and <= 1.5.x didn't have
  64         # this function
  65         if (::compare_svn_version('1.6.15') >= 0) {
  66                 my $config = SVN::Core::config_get_config($config_dir);
  67                 my ($p, @a);
  68                 # config_get_config returns all config files from
  69                 # ~/.subversion, auth_get_platform_specific_client_providers
  70                 # just wants the config "file".
  71                 @a = ($config->{'config'}, undef);
  72                 $p = SVN::Core::auth_get_platform_specific_client_providers(@a);
  73                 # Insert the return value from
  74                 # auth_get_platform_specific_providers
  75                 unshift @rv, @$p;
  76         }
  77         \@rv;
  78 }
  79
  80 sub prepare_config_once {
  81         SVN::_Core::svn_config_ensure($config_dir, undef);
  82         my ($baton, $callbacks) = SVN::Core::auth_open_helper(_auth_providers);
  83         my $config = SVN::Core::config_get_config($config_dir);
  84         my $dont_store_passwords = 1;
  85         my $conf_t = $config->{'config'};
  86
  87         no warnings 'once';
  88         # The usage of $SVN::_Core::SVN_CONFIG_* variables
  89         # produces warnings that variables are used only once.
  90         # I had not found the better way to shut them up, so
  91         # the warnings of type 'once' are disabled in this block.
  92         if (SVN::_Core::svn_config_get_bool($conf_t,
  93             $SVN::_Core::SVN_CONFIG_SECTION_AUTH,
  94             $SVN::_Core::SVN_CONFIG_OPTION_STORE_PASSWORDS,
  95             1) == 0) {
  96                 SVN::_Core::svn_auth_set_parameter($baton,
  97                     $SVN::_Core::SVN_AUTH_PARAM_DONT_STORE_PASSWORDS,
  98                     bless (\$dont_store_passwords, "_p_void"));
  99         }
 100         if (SVN::_Core::svn_config_get_bool($conf_t,
 101             $SVN::_Core::SVN_CONFIG_SECTION_AUTH,
 102             $SVN::_Core::SVN_CONFIG_OPTION_STORE_AUTH_CREDS,
 103             1) == 0) {
 104                 $Git::SVN::Prompt::_no_auth_cache = 1;
 105         }
 106
 107         return ($config, $baton, $callbacks);
 108 } # no warnings 'once'
 109
 110 INIT {
 111         Memoize::memoize '_auth_providers';
 112         Memoize::memoize 'prepare_config_once';
 113 }
 114
 115 sub new {
 116         my ($class, $url) = @_;
 117         $url = canonicalize_url($url);
 118         return $RA if ($RA && $RA->url eq $url);
 119
 120         ::_req_svn();
 121
 122         $RA = undef;
 123         my ($config, $baton, $callbacks) = prepare_config_once();
 124         my $self = SVN::Ra->new(url => $url, auth => $baton,
 125                               config => $config,
 126                               pool => SVN::Pool->new,
 127                               auth_provider_callbacks => $callbacks);
 128         $RA = bless $self, $class;
 129
 130         # Make sure its canonicalized
 131         $self->url($url);
 132         $self->{svn_path} = $url;
 133         $self->{repos_root} = $self->get_repos_root;
 134         $self->{svn_path} =~ s#^\Q$self->{repos_root}\E(/|$)##;
 135         $self->{cache} = { check_path => { r => 0, data => {} },
 136                            get_dir => { r => 0, data => {} } };
 137
 138         return $RA;
 139 }
 140
 141 sub url {
 142         my $self = shift;
 143
 144         if (@_) {
 145                 my $url = shift;
 146                 $self->{url} = canonicalize_url($url);
 147                 return;
 148         }
 149
 150         return $self->{url};
 151 }
 152
 153 sub check_path {
 154         my ($self, $path, $r) = @_;
 155         my $cache = $self->{cache}->{check_path};
 156         if ($r == $cache->{r} && exists $cache->{data}->{$path}) {
 157                 return $cache->{data}->{$path};
 158         }
 159         my $pool = SVN::Pool->new;
 160         my $t = $self->SUPER::check_path($path, $r, $pool);
 161         $pool->clear;
 162         if ($r != $cache->{r}) {
 163                 %{$cache->{data}} = ();
 164                 $cache->{r} = $r;
 165         }
 166         $cache->{data}->{$path} = $t;
 167 }
 168
 169 sub get_dir {
 170         my ($self, $dir, $r) = @_;
 171         my $cache = $self->{cache}->{get_dir};
 172         if ($r == $cache->{r}) {
 173                 if (my $x = $cache->{data}->{$dir}) {
 174                         return wantarray ? @$x : $x->[0];
 175                 }
 176         }
 177         my $pool = SVN::Pool->new;
 178         my ($d, undef, $props) = $self->SUPER::get_dir($dir, $r, $pool);
 179         my %dirents = map { $_ => { kind => $d->{$_}->kind } } keys %$d;
 180         $pool->clear;
 181         if ($r != $cache->{r}) {
 182                 %{$cache->{data}} = ();
 183                 $cache->{r} = $r;
 184         }
 185         $cache->{data}->{$dir} = [ \%dirents, $r, $props ];
 186         wantarray ? (\%dirents, $r, $props) : \%dirents;
 187 }
 188
 189 # get_log(paths, start, end, limit,
 190 #         discover_changed_paths, strict_node_history, receiver)
 191 sub get_log {
 192         my ($self, @args) = @_;
 193         my $pool = SVN::Pool->new;
 194
 195         # svn_log_changed_path_t objects passed to get_log are likely to be
 196         # overwritten even if only the refs are copied to an external variable,
 197         # so we should dup the structures in their entirety.  Using an
 198         # externally passed pool (instead of our temporary and quickly cleared
 199         # pool in Git::SVN::Ra) does not help matters at all...
 200         my $receiver = pop @args;
 201         my $prefix = "/".$self->{svn_path};
 202         $prefix =~ s#/+($)##;
 203         my $prefix_regex = qr#^\Q$prefix\E#;
 204         push(@args, sub {
 205                 my ($paths) = $_[0];
 206                 return &$receiver(@_) unless $paths;
 207                 $_[0] = ();
 208                 foreach my $p (keys %$paths) {
 209                         my $i = $paths->{$p};
 210                         # Make path relative to our url, not repos_root
 211                         $p =~ s/$prefix_regex//;
 212                         my %s = map { $_ => $i->$_; }
 213                                 qw/copyfrom_path copyfrom_rev action/;
 214                         if ($s{'copyfrom_path'}) {
 215                                 $s{'copyfrom_path'} =~ s/$prefix_regex//;
 216                                 $s{'copyfrom_path'} = canonicalize_path($s{'copyfrom_path'});
 217                         }
 218                         $_[0]{$p} = \%s;
 219                 }
 220                 &$receiver(@_);
 221         });
 222
 223
 224         # the limit parameter was not supported in SVN 1.1.x, so we
 225         # drop it.  Therefore, the receiver callback passed to it
 226         # is made aware of this limitation by being wrapped if
 227         # the limit passed to is being wrapped.
 228         if (::compare_svn_version('1.2.0') <= 0) {
 229                 my $limit = splice(@args, 3, 1);
 230                 if ($limit > 0) {
 231                         my $receiver = pop @args;
 232                         push(@args, sub { &$receiver(@_) if (--$limit >= 0) });
 233                 }
 234         }
 235         my $ret = $self->SUPER::get_log(@args, $pool);
 236         $pool->clear;
 237         $ret;
 238 }
 239
 240 sub trees_match {
 241         my ($self, $url1, $rev1, $url2, $rev2) = @_;
 242         my $ctx = SVN::Client->new(auth => _auth_providers);
 243         my $out = IO::File->new_tmpfile;
 244
 245         # older SVN (1.1.x) doesn't take $pool as the last parameter for
 246         # $ctx->diff(), so we'll create a default one
 247         my $pool = SVN::Pool->new_default_sub;
 248
 249         $ra_invalid = 1; # this will open a new SVN::Ra connection to $url1
 250         $ctx->diff([], $url1, $rev1, $url2, $rev2, 1, 1, 0, $out, $out);
 251         $out->flush;
 252         my $ret = (($out->stat)[7] == 0);
 253         close $out or croak $!;
 254
 255         $ret;
 256 }
 257
 258 sub get_commit_editor {
 259         my ($self, $log, $cb, $pool) = @_;
 260
 261         my @lock = (::compare_svn_version('1.2.0') >= 0) ? (undef, 0) : ();
 262         $self->SUPER::get_commit_editor($log, $cb, @lock, $pool);
 263 }
 264
 265 sub gs_do_update {
 266         my ($self, $rev_a, $rev_b, $gs, $editor) = @_;
 267         my $new = ($rev_a == $rev_b);
 268         my $path = $gs->path;
 269
 270         if ($new && -e $gs->{index}) {
 271                 unlink $gs->{index} or die
 272                   "Couldn't unlink index: $gs->{index}: $!\n";
 273         }
 274         my $pool = SVN::Pool->new;
 275         $editor->set_path_strip($path);
 276         my (@pc) = split m#/#, $path;
 277         my $reporter = $self->do_update($rev_b, (@pc ? shift @pc : ''),
 278                                         1, $editor, $pool);
 279         my @lock = (::compare_svn_version('1.2.0') >= 0) ? (undef) : ();
 280
 281         # Since we can't rely on svn_ra_reparent being available, we'll
 282         # just have to do some magic with set_path to make it so
 283         # we only want a partial path.
 284         my $sp = '';
 285         my $final = join('/', @pc);
 286         while (@pc) {
 287                 $reporter->set_path($sp, $rev_b, 0, @lock, $pool);
 288                 $sp .= '/' if length $sp;
 289                 $sp .= shift @pc;
 290         }
 291         die "BUG: '$sp' != '$final'\n" if ($sp ne $final);
 292
 293         $reporter->set_path($sp, $rev_a, $new, @lock, $pool);
 294
 295         $reporter->finish_report($pool);
 296         $pool->clear;
 297         $editor->{git_commit_ok};
 298 }
 299
 300 # this requires SVN 1.4.3 or later (do_switch didn't work before 1.4.3, and
 301 # svn_ra_reparent didn't work before 1.4)
 302 sub gs_do_switch {
 303         my ($self, $rev_a, $rev_b, $gs, $url_b, $editor) = @_;
 304         my $path = $gs->path;
 305         my $pool = SVN::Pool->new;
 306
 307         my $old_url = $self->url;
 308         my $full_url = add_path_to_url( $self->url, $path );
 309         my ($ra, $reparented);
 310
 311         if ($old_url =~ m#^svn(\+\w+)?://# ||
 312             ($full_url =~ m#^https?://# &&
 313              canonicalize_url($full_url) ne $full_url)) {
 314                 $_[0] = undef;
 315                 $self = undef;
 316                 $RA = undef;
 317                 $ra = Git::SVN::Ra->new($full_url);
 318                 $ra_invalid = 1;
 319         } elsif ($old_url ne $full_url) {
 320                 SVN::_Ra::svn_ra_reparent(
 321                         $self->{session},
 322                         canonicalize_url($full_url),
 323                         $pool
 324                 );
 325                 $self->url($full_url);
 326                 $reparented = 1;
 327         }
 328
 329         $ra ||= $self;
 330         $url_b = canonicalize_url($url_b);
 331         my $reporter = $ra->do_switch($rev_b, '', 1, $url_b, $editor, $pool);
 332         my @lock = (::compare_svn_version('1.2.0') >= 0) ? (undef) : ();
 333         $reporter->set_path('', $rev_a, 0, @lock, $pool);
 334         $reporter->finish_report($pool);
 335
 336         if ($reparented) {
 337                 SVN::_Ra::svn_ra_reparent($self->{session}, $old_url, $pool);
 338                 $self->url($old_url);
 339         }
 340
 341         $pool->clear;
 342         $editor->{git_commit_ok};
 343 }
 344
 345 sub longest_common_path {
 346         my ($gsv, $globs) = @_;
 347         my %common;
 348         my $common_max = scalar @$gsv;
 349
 350         foreach my $gs (@$gsv) {
 351                 my @tmp = split m#/#, $gs->path;
 352                 my $p = '';
 353                 foreach (@tmp) {
 354                         $p .= length($p) ? "/$_" : $_;
 355                         $common{$p} ||= 0;
 356                         $common{$p}++;
 357                 }
 358         }
 359         $globs ||= [];
 360         $common_max += scalar @$globs;
 361         foreach my $glob (@$globs) {
 362                 my @tmp = split m#/#, $glob->{path}->{left};
 363                 my $p = '';
 364                 foreach (@tmp) {
 365                         $p .= length($p) ? "/$_" : $_;
 366                         $common{$p} ||= 0;
 367                         $common{$p}++;
 368                 }
 369         }
 370
 371         my $longest_path = '';
 372         foreach (sort {length $b <=> length $a} keys %common) {
 373                 if ($common{$_} == $common_max) {
 374                         $longest_path = $_;
 375                         last;
 376                 }
 377         }
 378         $longest_path;
 379 }
 380
 381 sub gs_fetch_loop_common {
 382         my ($self, $base, $head, $gsv, $globs) = @_;
 383         return if ($base > $head);
 384         my $gpool = SVN::Pool->new_default;
 385         my $ra_url = $self->url;
 386         my $reload_ra = sub {
 387                 $_[0] = undef;
 388                 $self = undef;
 389                 $RA = undef;
 390                 $gpool->clear;
 391                 $self = Git::SVN::Ra->new($ra_url);
 392                 $ra_invalid = undef;
 393         };
 394         my $inc = $_log_window_size;
 395         my ($min, $max) = ($base, $head < $base + $inc ? $head : $base + $inc);
 396         my $longest_path = longest_common_path($gsv, $globs);
 397         my $find_trailing_edge;
 398         while (1) {
 399                 my %revs;
 400                 my $err;
 401                 my $err_handler = $SVN::Error::handler;
 402                 $SVN::Error::handler = sub {
 403                         ($err) = @_;
 404                         skip_unknown_revs($err);
 405                 };
 406                 sub _cb {
 407                         my ($paths, $r, $author, $date, $log) = @_;
 408                         [ $paths,
 409                           { author => $author, date => $date, log => $log } ];
 410                 }
 411                 $self->get_log([$longest_path], $min, $max, 0, 1, 1,
 412                                sub { $revs{$_[1]} = _cb(@_) });
 413                 if ($err) {
 414                         print "Checked through r$max\r";
 415                 } else {
 416                         $find_trailing_edge = 1;
 417                 }
 418                 if ($err and $find_trailing_edge) {
 419                         print STDERR "Path '$longest_path' ",
 420                                      "was probably deleted:\n",
 421                                      $err->expanded_message,
 422                                      "\nWill attempt to follow ",
 423                                      "revisions r$min .. r$max ",
 424                                      "committed before the deletion\n";
 425                         my $hi = $max;
 426                         while (--$hi >= $min) {
 427                                 my $ok;
 428                                 $self->get_log([$longest_path], $min, $hi,
 429                                                0, 1, 1, sub {
 430                                                $ok = $_[1];
 431                                                $revs{$_[1]} = _cb(@_) });
 432                                 if ($ok) {
 433                                         print STDERR "r$min .. r$ok OK\n";
 434                                         last;
 435                                 }
 436                         }
 437                         $find_trailing_edge = 0;
 438                 }
 439                 $SVN::Error::handler = $err_handler;
 440
 441                 my %exists = map { $_->path => $_ } @$gsv;
 442                 foreach my $r (sort {$a <=> $b} keys %revs) {
 443                         my ($paths, $logged) = @{delete $revs{$r}};
 444
 445                         foreach my $gs ($self->match_globs(\%exists, $paths,
 446                                                            $globs, $r)) {
 447                                 if ($gs->rev_map_max >= $r) {
 448                                         next;
 449                                 }
 450                                 next unless $gs->match_paths($paths, $r);
 451                                 $gs->{logged_rev_props} = $logged;
 452                                 if (my $last_commit = $gs->last_commit) {
 453                                         $gs->assert_index_clean($last_commit);
 454                                 }
 455                                 my $log_entry = $gs->do_fetch($paths, $r);
 456                                 if ($log_entry) {
 457                                         $gs->do_git_commit($log_entry);
 458                                 }
 459                                 $Git::SVN::INDEX_FILES{$gs->{index}} = 1;
 460                         }
 461                         foreach my $g (@$globs) {
 462                                 my $k = "svn-remote.$g->{remote}." .
 463                                         "$g->{t}-maxRev";
 464                                 Git::SVN::tmp_config($k, $r);
 465                         }
 466                         $reload_ra->() if $ra_invalid;
 467                 }
 468                 # pre-fill the .rev_db since it'll eventually get filled in
 469                 # with '0' x40 if something new gets committed
 470                 foreach my $gs (@$gsv) {
 471                         next if $gs->rev_map_max >= $max;
 472                         next if defined $gs->rev_map_get($max);
 473                         $gs->rev_map_set($max, 0 x40);
 474                 }
 475                 foreach my $g (@$globs) {
 476                         my $k = "svn-remote.$g->{remote}.$g->{t}-maxRev";
 477                         Git::SVN::tmp_config($k, $max);
 478                 }
 479                 last if $max >= $head;
 480                 $min = $max + 1;
 481                 $max += $inc;
 482                 $max = $head if ($max > $head);
 483
 484                 $reload_ra->();
 485         }
 486         Git::SVN::gc();
 487 }
 488
 489 sub get_dir_globbed {
 490         my ($self, $left, $depth, $r) = @_;
 491
 492         my @x = eval { $self->get_dir($left, $r) };
 493         return unless scalar @x == 3;
 494         my $dirents = $x[0];
 495         my @finalents;
 496         foreach my $de (keys %$dirents) {
 497                 next if $dirents->{$de}->{kind} != $SVN::Node::dir;
 498                 if ($depth > 1) {
 499                         my @args = ("$left/$de", $depth - 1, $r);
 500                         foreach my $dir ($self->get_dir_globbed(@args)) {
 501                                 push @finalents, "$de/$dir";
 502                         }
 503                 } else {
 504                         push @finalents, $de;
 505                 }
 506         }
 507         @finalents;
 508 }
 509
 510 # return value: 0 -- don't ignore, 1 -- ignore
 511 sub is_ref_ignored {
 512         my ($g, $p) = @_;
 513         my $refname = $g->{ref}->full_path($p);
 514         return 1 if defined($g->{ignore_refs_regex}) &&
 515                     $refname =~ m!$g->{ignore_refs_regex}!;
 516         return 0 unless defined($_ignore_refs_regex);
 517         return 1 if $refname =~ m!$_ignore_refs_regex!o;
 518         return 0;
 519 }
 520
 521 sub match_globs {
 522         my ($self, $exists, $paths, $globs, $r) = @_;
 523
 524         sub get_dir_check {
 525                 my ($self, $exists, $g, $r) = @_;
 526
 527                 my @dirs = $self->get_dir_globbed($g->{path}->{left},
 528                                                   $g->{path}->{depth},
 529                                                   $r);
 530
 531                 foreach my $de (@dirs) {
 532                         my $p = $g->{path}->full_path($de);
 533                         next if $exists->{$p};
 534                         next if (length $g->{path}->{right} &&
 535                                  ($self->check_path($p, $r) !=
 536                                   $SVN::Node::dir));
 537                         next unless $p =~ /$g->{path}->{regex}/;
 538                         $exists->{$p} = Git::SVN->init($self->url, $p, undef,
 539                                          $g->{ref}->full_path($de), 1);
 540                 }
 541         }
 542         foreach my $g (@$globs) {
 543                 if (my $path = $paths->{"/$g->{path}->{left}"}) {
 544                         if ($path->{action} =~ /^[AR]$/) {
 545                                 get_dir_check($self, $exists, $g, $r);
 546                         }
 547                 }
 548                 foreach (keys %$paths) {
 549                         if (/$g->{path}->{left_regex}/ &&
 550                             !/$g->{path}->{regex}/) {
 551                                 next if $paths->{$_}->{action} !~ /^[AR]$/;
 552                                 get_dir_check($self, $exists, $g, $r);
 553                         }
 554                         next unless /$g->{path}->{regex}/;
 555                         my $p = $1;
 556                         my $pathname = $g->{path}->full_path($p);
 557                         next if is_ref_ignored($g, $p);
 558                         next if $exists->{$pathname};
 559                         next if ($self->check_path($pathname, $r) !=
 560                                  $SVN::Node::dir);
 561                         $exists->{$pathname} = Git::SVN->init(
 562                                               $self->url, $pathname, undef,
 563                                               $g->{ref}->full_path($p), 1);
 564                 }
 565                 my $c = '';
 566                 foreach (split m#/#, $g->{path}->{left}) {
 567                         $c .= "/$_";
 568                         next unless ($paths->{$c} &&
 569                                      ($paths->{$c}->{action} =~ /^[AR]$/));
 570                         get_dir_check($self, $exists, $g, $r);
 571                 }
 572         }
 573         values %$exists;
 574 }
 575
 576 sub minimize_url {
 577         my ($self) = @_;
 578         return $self->url if ($self->url eq $self->{repos_root});
 579         my $url = $self->{repos_root};
 580         my @components = split(m!/!, $self->{svn_path});
 581         my $c = '';
 582         do {
 583                 $url = add_path_to_url($url, $c);
 584                 eval {
 585                         my $ra = (ref $self)->new($url);
 586                         my $latest = $ra->get_latest_revnum;
 587                         $ra->get_log("", $latest, 0, 1, 0, 1, sub {});
 588                 };
 589         } while ($@ && ($c = shift @components));
 590
 591         return canonicalize_url($url);
 592 }
 593
 594 sub can_do_switch {
 595         my $self = shift;
 596         unless (defined $can_do_switch) {
 597                 my $pool = SVN::Pool->new;
 598                 my $rep = eval {
 599                         $self->do_switch(1, '', 0, $self->url,
 600                                          SVN::Delta::Editor->new, $pool);
 601                 };
 602                 if ($@) {
 603                         $can_do_switch = 0;
 604                 } else {
 605                         $rep->abort_report($pool);
 606                         $can_do_switch = 1;
 607                 }
 608                 $pool->clear;
 609         }
 610         $can_do_switch;
 611 }
 612
 613 sub skip_unknown_revs {
 614         my ($err) = @_;
 615         my $errno = $err->apr_err();
 616         # Maybe the branch we're tracking didn't
 617         # exist when the repo started, so it's
 618         # not an error if it doesn't, just continue
 619         #
 620         # Wonderfully consistent library, eh?
 621         # 160013 - svn:// and file://
 622         # 175002 - http(s)://
 623         # 175007 - http(s):// (this repo required authorization, too...)
 624         #   More codes may be discovered later...
 625         if ($errno == 175007 || $errno == 175002 || $errno == 160013) {
 626                 my $err_key = $err->expanded_message;
 627                 # revision numbers change every time, filter them out
 628                 $err_key =~ s/\d+/\0/g;
 629                 $err_key = "$errno\0$err_key";
 630                 unless ($ignored_err{$err_key}) {
 631                         warn "W: Ignoring error from SVN, path probably ",
 632                              "does not exist: ($errno): ",
 633                              $err->expanded_message,"\n";
 634                         warn "W: Do not be alarmed at the above message ",
 635                              "git-svn is just searching aggressively for ",
 636                              "old history.\n",
 637                              "This may take a while on large repositories\n";
 638                         $ignored_err{$err_key} = 1;
 639                 }
 640                 return;
 641         }
 642         die "Error from SVN, ($errno): ", $err->expanded_message,"\n";
 643 }
 644
 645 1;
 646 __END__
 647
 648 =head1 NAME
 649
 650 Git::SVN::Ra - Subversion remote access functions for git-svn
 651
 652 =head1 SYNOPSIS
 653
 654     use Git::SVN::Ra;
 655
 656     my $ra = Git::SVN::Ra->new($branchurl);
 657     my ($dirents, $fetched_revnum, $props) =
 658         $ra->get_dir('.', $SVN::Core::INVALID_REVNUM);
 659
 660 =head1 DESCRIPTION
 661
 662 This is a wrapper around the L<SVN::Ra> module for use by B<git-svn>.
 663 It fills in some default parameters (such as the authentication
 664 scheme), smooths over incompatibilities between libsvn versions, adds
 665 caching, and implements some functions specific to B<git-svn>.
 666
 667 Do not use it unless you are developing git-svn.  The interface will
 668 change as git-svn evolves.
 669
 670 =head1 DEPENDENCIES
 671
 672 Subversion perl bindings,
 673 L<Git::SVN>.
 674
 675 C<Git::SVN::Ra> has not been tested using callers other than
 676 B<git-svn> itself.
 677
 678 =head1 SEE ALSO
 679
 680 L<SVN::Ra>.
 681
 682 =head1 INCOMPATIBILITIES
 683
 684 None reported.
 685
 686 =head1 BUGS
 687
 688 None.