Andrew's git / gitweb.git / perl/Git/SVN/Ra.pm
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perl / Git / SVN / Ra.pmon commit Merge branch 'br/svn-doc-include-paths-config' into maint (d6579d9)
   1package Git::SVN::Ra;
   2use vars qw/@ISA $config_dir $_ignore_refs_regex $_log_window_size/;
   3use strict;
   4use warnings;
   5use Memoize;
   6use Git::SVN::Utils qw(
   7        canonicalize_url
   8        canonicalize_path
   9        add_path_to_url
  10);
  11
  12use SVN::Ra;
  13BEGIN {
  14        @ISA = qw(SVN::Ra);
  15}
  16
  17my ($ra_invalid, $can_do_switch, %ignored_err, $RA);
  18
  19BEGIN {
  20        # enforce temporary pool usage for some simple functions
  21        no strict 'refs';
  22        for my $f (qw/rev_proplist get_latest_revnum get_uuid get_repos_root
  23                      get_file/) {
  24                my $SUPER = "SUPER::$f";
  25                *$f = sub {
  26                        my $self = shift;
  27                        my $pool = SVN::Pool->new;
  28                        my @ret = $self->$SUPER(@_,$pool);
  29                        $pool->clear;
  30                        wantarray ? @ret : $ret[0];
  31                };
  32        }
  33}
  34
  35# serf has a bug that leads to a coredump upon termination if the
  36# remote access object is left around (not fixed yet in serf 1.3.1).
  37# Explicitly free it to work around the issue.
  38END {
  39        $RA = undef;
  40        $ra_invalid = 1;
  41}
  42
  43sub _auth_providers () {
  44        require SVN::Client;
  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
  80sub 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, $callbacks);
 108} # no warnings 'once'
 109
 110INIT {
 111        Memoize::memoize '_auth_providers';
 112        Memoize::memoize 'prepare_config_once';
 113}
 114
 115sub new {
 116        my ($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
 141sub url {
 142        my $self = shift;
 143
 144        if (@_) {
 145                my $url = shift;
 146                $self->{url} = canonicalize_url($url);
 147                return;
 148        }
 149
 150        return $self->{url};
 151}
 152
 153sub check_path {
 154        my ($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} = $t;
 167}
 168
 169sub get_dir {
 170        my ($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);
 179
 180        if (::compare_svn_version('1.4.0') >= 0) {
 181                # n.b. in addition to being potentially more efficient,
 182                # this works around what appears to be a bug in some
 183                # SVN 1.8 versions
 184                my $kind = 1; # SVN_DIRENT_KIND
 185                ($d, undef, $props) = $self->get_dir2($dir, $r, $kind, $pool);
 186        } else {
 187                ($d, undef, $props) = $self->SUPER::get_dir($dir, $r, $pool);
 188        }
 189        my %dirents = map { $_ => { kind => $d->{$_}->kind } } keys %$d;
 190        $pool->clear;
 191        if ($r != $cache->{r}) {
 192                %{$cache->{data}} = ();
 193                $cache->{r} = $r;
 194        }
 195        $cache->{data}->{$dir} = [ \%dirents, $r, $props ];
 196        wantarray ? (\%dirents, $r, $props) : \%dirents;
 197}
 198
 199# get_log(paths, start, end, limit,
 200#         discover_changed_paths, strict_node_history, receiver)
 201sub get_log {
 202        my ($self, @args) = @_;
 203        my $pool = SVN::Pool->new;
 204
 205        # svn_log_changed_path_t objects passed to get_log are likely to be
 206        # overwritten even if only the refs are copied to an external variable,
 207        # so we should dup the structures in their entirety.  Using an
 208        # externally passed pool (instead of our temporary and quickly cleared
 209        # pool in Git::SVN::Ra) does not help matters at all...
 210        my $receiver = pop @args;
 211        my $prefix = "/".$self->{svn_path};
 212        $prefix =~ s#/+($)##;
 213        my $prefix_regex = qr#^\Q$prefix\E#;
 214        push(@args, sub {
 215                my ($paths) = $_[0];
 216                return &$receiver(@_) unless $paths;
 217                $_[0] = ();
 218                foreach my $p (keys %$paths) {
 219                        my $i = $paths->{$p};
 220                        # Make path relative to our url, not repos_root
 221                        $p =~ s/$prefix_regex//;
 222                        my %s = map { $_ => $i->$_; }
 223                                qw/copyfrom_path copyfrom_rev action/;
 224                        if ($s{'copyfrom_path'}) {
 225                                $s{'copyfrom_path'} =~ s/$prefix_regex//;
 226                                $s{'copyfrom_path'} = canonicalize_path($s{'copyfrom_path'});
 227                        }
 228                        $_[0]{$p} = \%s;
 229                }
 230                &$receiver(@_);
 231        });
 232
 233
 234        # the limit parameter was not supported in SVN 1.1.x, so we
 235        # drop it.  Therefore, the receiver callback passed to it
 236        # is made aware of this limitation by being wrapped if
 237        # the limit passed to is being wrapped.
 238        if (::compare_svn_version('1.2.0') <= 0) {
 239                my $limit = splice(@args, 3, 1);
 240                if ($limit > 0) {
 241                        my $receiver = pop @args;
 242                        push(@args, sub { &$receiver(@_) if (--$limit >= 0) });
 243                }
 244        }
 245        my $ret = $self->SUPER::get_log(@args, $pool);
 246        $pool->clear;
 247        $ret;
 248}
 249
 250# uncommon, only for ancient SVN (<= 1.4.2)
 251sub trees_match {
 252        require IO::File;
 253        require SVN::Client;
 254        my ($self, $url1, $rev1, $url2, $rev2) = @_;
 255        my $ctx = SVN::Client->new(auth => _auth_providers);
 256        my $out = IO::File->new_tmpfile;
 257
 258        # older SVN (1.1.x) doesn't take $pool as the last parameter for
 259        # $ctx->diff(), so we'll create a default one
 260        my $pool = SVN::Pool->new_default_sub;
 261
 262        $ra_invalid = 1; # this will open a new SVN::Ra connection to $url1
 263        $ctx->diff([], $url1, $rev1, $url2, $rev2, 1, 1, 0, $out, $out);
 264        $out->flush;
 265        my $ret = (($out->stat)[7] == 0);
 266        close $out or croak $!;
 267
 268        $ret;
 269}
 270
 271sub get_commit_editor {
 272        my ($self, $log, $cb, $pool) = @_;
 273
 274        my @lock = (::compare_svn_version('1.2.0') >= 0) ? (undef, 0) : ();
 275        $self->SUPER::get_commit_editor($log, $cb, @lock, $pool);
 276}
 277
 278sub gs_do_update {
 279        my ($self, $rev_a, $rev_b, $gs, $editor) = @_;
 280        my $new = ($rev_a == $rev_b);
 281        my $path = $gs->path;
 282
 283        if ($new && -e $gs->{index}) {
 284                unlink $gs->{index} or die
 285                  "Couldn't unlink index: $gs->{index}: $!\n";
 286        }
 287        my $pool = SVN::Pool->new;
 288        $editor->set_path_strip($path);
 289        my (@pc) = split m#/#, $path;
 290        my $reporter = $self->do_update($rev_b, (@pc ? shift @pc : ''),
 291                                        1, $editor, $pool);
 292        my @lock = (::compare_svn_version('1.2.0') >= 0) ? (undef) : ();
 293
 294        # Since we can't rely on svn_ra_reparent being available, we'll
 295        # just have to do some magic with set_path to make it so
 296        # we only want a partial path.
 297        my $sp = '';
 298        my $final = join('/', @pc);
 299        while (@pc) {
 300                $reporter->set_path($sp, $rev_b, 0, @lock, $pool);
 301                $sp .= '/' if length $sp;
 302                $sp .= shift @pc;
 303        }
 304        die "BUG: '$sp' != '$final'\n" if ($sp ne $final);
 305
 306        $reporter->set_path($sp, $rev_a, $new, @lock, $pool);
 307
 308        $reporter->finish_report($pool);
 309        $pool->clear;
 310        $editor->{git_commit_ok};
 311}
 312
 313# this requires SVN 1.4.3 or later (do_switch didn't work before 1.4.3, and
 314# svn_ra_reparent didn't work before 1.4)
 315sub gs_do_switch {
 316        my ($self, $rev_a, $rev_b, $gs, $url_b, $editor) = @_;
 317        my $path = $gs->path;
 318        my $pool = SVN::Pool->new;
 319
 320        my $old_url = $self->url;
 321        my $full_url = add_path_to_url( $self->url, $path );
 322        my ($ra, $reparented);
 323
 324        if ($old_url =~ m#^svn(\+\w+)?://# ||
 325            ($full_url =~ m#^https?://# &&
 326             canonicalize_url($full_url) ne $full_url)) {
 327                $_[0] = undef;
 328                $self = undef;
 329                $RA = undef;
 330                $ra = Git::SVN::Ra->new($full_url);
 331                $ra_invalid = 1;
 332        } elsif ($old_url ne $full_url) {
 333                SVN::_Ra::svn_ra_reparent(
 334                        $self->{session},
 335                        canonicalize_url($full_url),
 336                        $pool
 337                );
 338                $self->url($full_url);
 339                $reparented = 1;
 340        }
 341
 342        $ra ||= $self;
 343        $url_b = canonicalize_url($url_b);
 344        my $reporter = $ra->do_switch($rev_b, '', 1, $url_b, $editor, $pool);
 345        my @lock = (::compare_svn_version('1.2.0') >= 0) ? (undef) : ();
 346        $reporter->set_path('', $rev_a, 0, @lock, $pool);
 347        $reporter->finish_report($pool);
 348
 349        if ($reparented) {
 350                SVN::_Ra::svn_ra_reparent($self->{session}, $old_url, $pool);
 351                $self->url($old_url);
 352        }
 353
 354        $pool->clear;
 355        $editor->{git_commit_ok};
 356}
 357
 358sub longest_common_path {
 359        my ($gsv, $globs) = @_;
 360        my %common;
 361        my $common_max = scalar @$gsv;
 362
 363        foreach my $gs (@$gsv) {
 364                my @tmp = split m#/#, $gs->path;
 365                my $p = '';
 366                foreach (@tmp) {
 367                        $p .= length($p) ? "/$_" : $_;
 368                        $common{$p} ||= 0;
 369                        $common{$p}++;
 370                }
 371        }
 372        $globs ||= [];
 373        $common_max += scalar @$globs;
 374        foreach my $glob (@$globs) {
 375                my @tmp = split m#/#, $glob->{path}->{left};
 376                my $p = '';
 377                foreach (@tmp) {
 378                        $p .= length($p) ? "/$_" : $_;
 379                        $common{$p} ||= 0;
 380                        $common{$p}++;
 381                }
 382        }
 383
 384        my $longest_path = '';
 385        foreach (sort {length $b <=> length $a} keys %common) {
 386                if ($common{$_} == $common_max) {
 387                        $longest_path = $_;
 388                        last;
 389                }
 390        }
 391        $longest_path;
 392}
 393
 394sub gs_fetch_loop_common {
 395        my ($self, $base, $head, $gsv, $globs) = @_;
 396        return if ($base > $head);
 397        # Make sure the cat_blob open2 FileHandle is created before calling
 398        # SVN::Pool::new_default so that it does not incorrectly end up in the pool.
 399        $::_repository->_open_cat_blob_if_needed;
 400        my $gpool = SVN::Pool->new_default;
 401        my $ra_url = $self->url;
 402        my $reload_ra = sub {
 403                $_[0] = undef;
 404                $self = undef;
 405                $RA = undef;
 406                $gpool->clear;
 407                $self = Git::SVN::Ra->new($ra_url);
 408                $ra_invalid = undef;
 409        };
 410        my $inc = $_log_window_size;
 411        my ($min, $max) = ($base, $head < $base + $inc ? $head : $base + $inc);
 412        my $longest_path = longest_common_path($gsv, $globs);
 413        my $find_trailing_edge;
 414        while (1) {
 415                my %revs;
 416                my $err;
 417                my $err_handler = $SVN::Error::handler;
 418                $SVN::Error::handler = sub {
 419                        ($err) = @_;
 420                        skip_unknown_revs($err);
 421                };
 422                sub _cb {
 423                        my ($paths, $r, $author, $date, $log) = @_;
 424                        [ $paths,
 425                          { author => $author, date => $date, log => $log } ];
 426                }
 427                $self->get_log([$longest_path], $min, $max, 0, 1, 1,
 428                               sub { $revs{$_[1]} = _cb(@_) });
 429                if ($err) {
 430                        print "Checked through r$max\r";
 431                } else {
 432                        $find_trailing_edge = 1;
 433                }
 434                if ($err and $find_trailing_edge) {
 435                        print STDERR "Path '$longest_path' ",
 436                                     "was probably deleted:\n",
 437                                     $err->expanded_message,
 438                                     "\nWill attempt to follow ",
 439                                     "revisions r$min .. r$max ",
 440                                     "committed before the deletion\n";
 441                        my $hi = $max;
 442                        while (--$hi >= $min) {
 443                                my $ok;
 444                                $self->get_log([$longest_path], $min, $hi,
 445                                               0, 1, 1, sub {
 446                                               $ok = $_[1];
 447                                               $revs{$_[1]} = _cb(@_) });
 448                                if ($ok) {
 449                                        print STDERR "r$min .. r$ok OK\n";
 450                                        last;
 451                                }
 452                        }
 453                        $find_trailing_edge = 0;
 454                }
 455                $SVN::Error::handler = $err_handler;
 456
 457                my %exists = map { $_->path => $_ } @$gsv;
 458                foreach my $r (sort {$a <=> $b} keys %revs) {
 459                        my ($paths, $logged) = @{delete $revs{$r}};
 460
 461                        foreach my $gs ($self->match_globs(\%exists, $paths,
 462                                                           $globs, $r)) {
 463                                if ($gs->rev_map_max >= $r) {
 464                                        next;
 465                                }
 466                                next unless $gs->match_paths($paths, $r);
 467                                $gs->{logged_rev_props} = $logged;
 468                                if (my $last_commit = $gs->last_commit) {
 469                                        $gs->assert_index_clean($last_commit);
 470                                }
 471                                my $log_entry = $gs->do_fetch($paths, $r);
 472                                if ($log_entry) {
 473                                        $gs->do_git_commit($log_entry);
 474                                }
 475                                $Git::SVN::INDEX_FILES{$gs->{index}} = 1;
 476                        }
 477                        foreach my $g (@$globs) {
 478                                my $k = "svn-remote.$g->{remote}." .
 479                                        "$g->{t}-maxRev";
 480                                Git::SVN::tmp_config($k, $r);
 481                        }
 482                        $reload_ra->() if $ra_invalid;
 483                }
 484                # pre-fill the .rev_db since it'll eventually get filled in
 485                # with '0' x40 if something new gets committed
 486                foreach my $gs (@$gsv) {
 487                        next if $gs->rev_map_max >= $max;
 488                        next if defined $gs->rev_map_get($max);
 489                        $gs->rev_map_set($max, 0 x40);
 490                }
 491                foreach my $g (@$globs) {
 492                        my $k = "svn-remote.$g->{remote}.$g->{t}-maxRev";
 493                        Git::SVN::tmp_config($k, $max);
 494                }
 495                last if $max >= $head;
 496                $min = $max + 1;
 497                $max += $inc;
 498                $max = $head if ($max > $head);
 499
 500                $reload_ra->();
 501        }
 502        Git::SVN::gc();
 503}
 504
 505sub get_dir_globbed {
 506        my ($self, $left, $depth, $r) = @_;
 507
 508        my @x = eval { $self->get_dir($left, $r) };
 509        return unless scalar @x == 3;
 510        my $dirents = $x[0];
 511        my @finalents;
 512        foreach my $de (keys %$dirents) {
 513                next if $dirents->{$de}->{kind} != $SVN::Node::dir;
 514                if ($depth > 1) {
 515                        my @args = ("$left/$de", $depth - 1, $r);
 516                        foreach my $dir ($self->get_dir_globbed(@args)) {
 517                                push @finalents, "$de/$dir";
 518                        }
 519                } else {
 520                        push @finalents, $de;
 521                }
 522        }
 523        @finalents;
 524}
 525
 526# return value: 0 -- don't ignore, 1 -- ignore
 527sub is_ref_ignored {
 528        my ($g, $p) = @_;
 529        my $refname = $g->{ref}->full_path($p);
 530        return 1 if defined($g->{ignore_refs_regex}) &&
 531                    $refname =~ m!$g->{ignore_refs_regex}!;
 532        return 0 unless defined($_ignore_refs_regex);
 533        return 1 if $refname =~ m!$_ignore_refs_regex!o;
 534        return 0;
 535}
 536
 537sub match_globs {
 538        my ($self, $exists, $paths, $globs, $r) = @_;
 539
 540        sub get_dir_check {
 541                my ($self, $exists, $g, $r) = @_;
 542
 543                my @dirs = $self->get_dir_globbed($g->{path}->{left},
 544                                                  $g->{path}->{depth},
 545                                                  $r);
 546
 547                foreach my $de (@dirs) {
 548                        my $p = $g->{path}->full_path($de);
 549                        next if $exists->{$p};
 550                        next if (length $g->{path}->{right} &&
 551                                 ($self->check_path($p, $r) !=
 552                                  $SVN::Node::dir));
 553                        next unless $p =~ /$g->{path}->{regex}/;
 554                        $exists->{$p} = Git::SVN->init($self->url, $p, undef,
 555                                         $g->{ref}->full_path($de), 1);
 556                }
 557        }
 558        foreach my $g (@$globs) {
 559                if (my $path = $paths->{"/$g->{path}->{left}"}) {
 560                        if ($path->{action} =~ /^[AR]$/) {
 561                                get_dir_check($self, $exists, $g, $r);
 562                        }
 563                }
 564                foreach (keys %$paths) {
 565                        if (/$g->{path}->{left_regex}/ &&
 566                            !/$g->{path}->{regex}/) {
 567                                next if $paths->{$_}->{action} !~ /^[AR]$/;
 568                                get_dir_check($self, $exists, $g, $r);
 569                        }
 570                        next unless /$g->{path}->{regex}/;
 571                        my $p = $1;
 572                        my $pathname = $g->{path}->full_path($p);
 573                        next if is_ref_ignored($g, $p);
 574                        next if $exists->{$pathname};
 575                        next if ($self->check_path($pathname, $r) !=
 576                                 $SVN::Node::dir);
 577                        $exists->{$pathname} = Git::SVN->init(
 578                                              $self->url, $pathname, undef,
 579                                              $g->{ref}->full_path($p), 1);
 580                }
 581                my $c = '';
 582                foreach (split m#/#, $g->{path}->{left}) {
 583                        $c .= "/$_";
 584                        next unless ($paths->{$c} &&
 585                                     ($paths->{$c}->{action} =~ /^[AR]$/));
 586                        get_dir_check($self, $exists, $g, $r);
 587                }
 588        }
 589        values %$exists;
 590}
 591
 592sub minimize_url {
 593        my ($self) = @_;
 594        return $self->url if ($self->url eq $self->{repos_root});
 595        my $url = $self->{repos_root};
 596        my @components = split(m!/!, $self->{svn_path});
 597        my $c = '';
 598        do {
 599                $url = add_path_to_url($url, $c);
 600                eval {
 601                        my $ra = (ref $self)->new($url);
 602                        my $latest = $ra->get_latest_revnum;
 603                        $ra->get_log("", $latest, 0, 1, 0, 1, sub {});
 604                };
 605        } while ($@ && ($c = shift @components));
 606
 607        return canonicalize_url($url);
 608}
 609
 610sub can_do_switch {
 611        my $self = shift;
 612        unless (defined $can_do_switch) {
 613                my $pool = SVN::Pool->new;
 614                my $rep = eval {
 615                        $self->do_switch(1, '', 0, $self->url,
 616                                         SVN::Delta::Editor->new, $pool);
 617                };
 618                if ($@) {
 619                        $can_do_switch = 0;
 620                } else {
 621                        $rep->abort_report($pool);
 622                        $can_do_switch = 1;
 623                }
 624                $pool->clear;
 625        }
 626        $can_do_switch;
 627}
 628
 629sub skip_unknown_revs {
 630        my ($err) = @_;
 631        my $errno = $err->apr_err();
 632        # Maybe the branch we're tracking didn't
 633        # exist when the repo started, so it's
 634        # not an error if it doesn't, just continue
 635        #
 636        # Wonderfully consistent library, eh?
 637        # 160013 - svn:// and file://
 638        # 175002 - http(s)://
 639        # 175007 - http(s):// (this repo required authorization, too...)
 640        #   More codes may be discovered later...
 641        if ($errno == 175007 || $errno == 175002 || $errno == 160013) {
 642                my $err_key = $err->expanded_message;
 643                # revision numbers change every time, filter them out
 644                $err_key =~ s/\d+/\0/g;
 645                $err_key = "$errno\0$err_key";
 646                unless ($ignored_err{$err_key}) {
 647                        warn "W: Ignoring error from SVN, path probably ",
 648                             "does not exist: ($errno): ",
 649                             $err->expanded_message,"\n";
 650                        warn "W: Do not be alarmed at the above message ",
 651                             "git-svn is just searching aggressively for ",
 652                             "old history.\n",
 653                             "This may take a while on large repositories\n";
 654                        $ignored_err{$err_key} = 1;
 655                }
 656                return;
 657        }
 658        die "Error from SVN, ($errno): ", $err->expanded_message,"\n";
 659}
 660
 6611;
 662__END__
 663
 664=head1 NAME
 665
 666Git::SVN::Ra - Subversion remote access functions for git-svn
 667
 668=head1 SYNOPSIS
 669
 670    use Git::SVN::Ra;
 671
 672    my $ra = Git::SVN::Ra->new($branchurl);
 673    my ($dirents, $fetched_revnum, $props) =
 674        $ra->get_dir('.', $SVN::Core::INVALID_REVNUM);
 675
 676=head1 DESCRIPTION
 677
 678This is a wrapper around the L<SVN::Ra> module for use by B<git-svn>.
 679It fills in some default parameters (such as the authentication
 680scheme), smooths over incompatibilities between libsvn versions, adds
 681caching, and implements some functions specific to B<git-svn>.
 682
 683Do not use it unless you are developing git-svn.  The interface will
 684change as git-svn evolves.
 685
 686=head1 DEPENDENCIES
 687
 688Subversion perl bindings,
 689L<Git::SVN>.
 690
 691C<Git::SVN::Ra> has not been tested using callers other than
 692B<git-svn> itself.
 693
 694=head1 SEE ALSO
 695
 696L<SVN::Ra>.
 697
 698=head1 INCOMPATIBILITIES
 699
 700None reported.
 701
 702=head1 BUGS
 703
 704None.