perl/Git/SVN/Editor.pm

   1 package Git::SVN::Editor;
   2 use vars qw/@ISA $_rmdir $_cp_similarity $_find_copies_harder $_rename_limit/;
   3 use strict;
   4 use warnings;
   5 use SVN::Core;
   6 use SVN::Delta;
   7 use Carp qw/croak/;
   8 use Git qw/command command_oneline command_noisy command_output_pipe
   9            command_input_pipe command_close_pipe
  10            command_bidi_pipe command_close_bidi_pipe/;
  11 BEGIN {
  12         @ISA = qw(SVN::Delta::Editor);
  13 }
  14
  15 sub new {
  16         my ($class, $opts) = @_;
  17         foreach (qw/svn_path r ra tree_a tree_b log editor_cb/) {
  18                 die "$_ required!\n" unless (defined $opts->{$_});
  19         }
  20
  21         my $pool = SVN::Pool->new;
  22         my $mods = generate_diff($opts->{tree_a}, $opts->{tree_b});
  23         my $types = check_diff_paths($opts->{ra}, $opts->{svn_path},
  24                                      $opts->{r}, $mods);
  25
  26         # $opts->{ra} functions should not be used after this:
  27         my @ce  = $opts->{ra}->get_commit_editor($opts->{log},
  28                                                 $opts->{editor_cb}, $pool);
  29         my $self = SVN::Delta::Editor->new(@ce, $pool);
  30         bless $self, $class;
  31         foreach (qw/svn_path r tree_a tree_b/) {
  32                 $self->{$_} = $opts->{$_};
  33         }
  34         $self->{url} = $opts->{ra}->{url};
  35         $self->{mods} = $mods;
  36         $self->{types} = $types;
  37         $self->{pool} = $pool;
  38         $self->{bat} = { '' => $self->open_root($self->{r}, $self->{pool}) };
  39         $self->{rm} = { };
  40         $self->{path_prefix} = length $self->{svn_path} ?
  41                                "$self->{svn_path}/" : '';
  42         $self->{config} = $opts->{config};
  43         $self->{mergeinfo} = $opts->{mergeinfo};
  44         $self->{pathnameencoding} = Git::config('svn.pathnameencoding');
  45         return $self;
  46 }
  47
  48 sub generate_diff {
  49         my ($tree_a, $tree_b) = @_;
  50         my @diff_tree = qw(diff-tree -z -r);
  51         if ($_cp_similarity) {
  52                 push @diff_tree, "-C$_cp_similarity";
  53         } else {
  54                 push @diff_tree, '-C';
  55         }
  56         push @diff_tree, '--find-copies-harder' if $_find_copies_harder;
  57         push @diff_tree, "-l$_rename_limit" if defined $_rename_limit;
  58         push @diff_tree, $tree_a, $tree_b;
  59         my ($diff_fh, $ctx) = command_output_pipe(@diff_tree);
  60         local $/ = "\0";
  61         my $state = 'meta';
  62         my @mods;
  63         while (<$diff_fh>) {
  64                 chomp $_; # this gets rid of the trailing "\0"
  65                 if ($state eq 'meta' && /^:(\d{6})\s(\d{6})\s
  66                                         ($::sha1)\s($::sha1)\s
  67                                         ([MTCRAD])\d*$/xo) {
  68                         push @mods, {   mode_a => $1, mode_b => $2,
  69                                         sha1_a => $3, sha1_b => $4,
  70                                         chg => $5 };
  71                         if ($5 =~ /^(?:C|R)$/) {
  72                                 $state = 'file_a';
  73                         } else {
  74                                 $state = 'file_b';
  75                         }
  76                 } elsif ($state eq 'file_a') {
  77                         my $x = $mods[$#mods] or croak "Empty array\n";
  78                         if ($x->{chg} !~ /^(?:C|R)$/) {
  79                                 croak "Error parsing $_, $x->{chg}\n";
  80                         }
  81                         $x->{file_a} = $_;
  82                         $state = 'file_b';
  83                 } elsif ($state eq 'file_b') {
  84                         my $x = $mods[$#mods] or croak "Empty array\n";
  85                         if (exists $x->{file_a} && $x->{chg} !~ /^(?:C|R)$/) {
  86                                 croak "Error parsing $_, $x->{chg}\n";
  87                         }
  88                         if (!exists $x->{file_a} && $x->{chg} =~ /^(?:C|R)$/) {
  89                                 croak "Error parsing $_, $x->{chg}\n";
  90                         }
  91                         $x->{file_b} = $_;
  92                         $state = 'meta';
  93                 } else {
  94                         croak "Error parsing $_\n";
  95                 }
  96         }
  97         command_close_pipe($diff_fh, $ctx);
  98         \@mods;
  99 }
 100
 101 sub check_diff_paths {
 102         my ($ra, $pfx, $rev, $mods) = @_;
 103         my %types;
 104         $pfx .= '/' if length $pfx;
 105
 106         sub type_diff_paths {
 107                 my ($ra, $types, $path, $rev) = @_;
 108                 my @p = split m#/+#, $path;
 109                 my $c = shift @p;
 110                 unless (defined $types->{$c}) {
 111                         $types->{$c} = $ra->check_path($c, $rev);
 112                 }
 113                 while (@p) {
 114                         $c .= '/' . shift @p;
 115                         next if defined $types->{$c};
 116                         $types->{$c} = $ra->check_path($c, $rev);
 117                 }
 118         }
 119
 120         foreach my $m (@$mods) {
 121                 foreach my $f (qw/file_a file_b/) {
 122                         next unless defined $m->{$f};
 123                         my ($dir) = ($m->{$f} =~ m#^(.*?)/?(?:[^/]+)$#);
 124                         if (length $pfx.$dir && ! defined $types{$dir}) {
 125                                 type_diff_paths($ra, \%types, $pfx.$dir, $rev);
 126                         }
 127                 }
 128         }
 129         \%types;
 130 }
 131
 132 sub split_path {
 133         return ($_[0] =~ m#^(.*?)/?([^/]+)$#);
 134 }
 135
 136 sub repo_path {
 137         my ($self, $path) = @_;
 138         if (my $enc = $self->{pathnameencoding}) {
 139                 require Encode;
 140                 Encode::from_to($path, $enc, 'UTF-8');
 141         }
 142         $self->{path_prefix}.(defined $path ? $path : '');
 143 }
 144
 145 sub url_path {
 146         my ($self, $path) = @_;
 147         $path = $self->repo_path($path);
 148         if ($self->{url} =~ m#^https?://#) {
 149                 # characters are taken from subversion/libsvn_subr/path.c
 150                 $path =~ s#([^~a-zA-Z0-9_./!$&'()*+,-])#sprintf("%%%02X",ord($1))#eg;
 151         }
 152         $self->{url} . '/' . $path;
 153 }
 154
 155 sub rmdirs {
 156         my ($self) = @_;
 157         my $rm = $self->{rm};
 158         delete $rm->{''}; # we never delete the url we're tracking
 159         return unless %$rm;
 160
 161         foreach (keys %$rm) {
 162                 my @d = split m#/#, $_;
 163                 my $c = shift @d;
 164                 $rm->{$c} = 1;
 165                 while (@d) {
 166                         $c .= '/' . shift @d;
 167                         $rm->{$c} = 1;
 168                 }
 169         }
 170         delete $rm->{$self->{svn_path}};
 171         delete $rm->{''}; # we never delete the url we're tracking
 172         return unless %$rm;
 173
 174         my ($fh, $ctx) = command_output_pipe(qw/ls-tree --name-only -r -z/,
 175                                              $self->{tree_b});
 176         local $/ = "\0";
 177         while (<$fh>) {
 178                 chomp;
 179                 my @dn = split m#/#, $_;
 180                 while (pop @dn) {
 181                         delete $rm->{join '/', @dn};
 182                 }
 183                 unless (%$rm) {
 184                         close $fh;
 185                         return;
 186                 }
 187         }
 188         command_close_pipe($fh, $ctx);
 189
 190         my ($r, $p, $bat) = ($self->{r}, $self->{pool}, $self->{bat});
 191         foreach my $d (sort { $b =~ tr#/#/# <=> $a =~ tr#/#/# } keys %$rm) {
 192                 $self->close_directory($bat->{$d}, $p);
 193                 my ($dn) = ($d =~ m#^(.*?)/?(?:[^/]+)$#);
 194                 print "\tD+\t$d/\n" unless $::_q;
 195                 $self->SUPER::delete_entry($d, $r, $bat->{$dn}, $p);
 196                 delete $bat->{$d};
 197         }
 198 }
 199
 200 sub open_or_add_dir {
 201         my ($self, $full_path, $baton, $deletions) = @_;
 202         my $t = $self->{types}->{$full_path};
 203         if (!defined $t) {
 204                 die "$full_path not known in r$self->{r} or we have a bug!\n";
 205         }
 206         {
 207                 no warnings 'once';
 208                 # SVN::Node::none and SVN::Node::file are used only once,
 209                 # so we're shutting up Perl's warnings about them.
 210                 if ($t == $SVN::Node::none || defined($deletions->{$full_path})) {
 211                         return $self->add_directory($full_path, $baton,
 212                             undef, -1, $self->{pool});
 213                 } elsif ($t == $SVN::Node::dir) {
 214                         return $self->open_directory($full_path, $baton,
 215                             $self->{r}, $self->{pool});
 216                 } # no warnings 'once'
 217                 print STDERR "$full_path already exists in repository at ",
 218                     "r$self->{r} and it is not a directory (",
 219                     ($t == $SVN::Node::file ? 'file' : 'unknown'),"/$t)\n";
 220         } # no warnings 'once'
 221         exit 1;
 222 }
 223
 224 sub ensure_path {
 225         my ($self, $path, $deletions) = @_;
 226         my $bat = $self->{bat};
 227         my $repo_path = $self->repo_path($path);
 228         return $bat->{''} unless (length $repo_path);
 229
 230         my @p = split m#/+#, $repo_path;
 231         my $c = shift @p;
 232         $bat->{$c} ||= $self->open_or_add_dir($c, $bat->{''}, $deletions);
 233         while (@p) {
 234                 my $c0 = $c;
 235                 $c .= '/' . shift @p;
 236                 $bat->{$c} ||= $self->open_or_add_dir($c, $bat->{$c0}, $deletions);
 237         }
 238         return $bat->{$c};
 239 }
 240
 241 # Subroutine to convert a globbing pattern to a regular expression.
 242 # From perl cookbook.
 243 sub glob2pat {
 244         my $globstr = shift;
 245         my %patmap = ('*' => '.*', '?' => '.', '[' => '[', ']' => ']');
 246         $globstr =~ s{(.)} { $patmap{$1} || "\Q$1" }ge;
 247         return '^' . $globstr . '$';
 248 }
 249
 250 sub check_autoprop {
 251         my ($self, $pattern, $properties, $file, $fbat) = @_;
 252         # Convert the globbing pattern to a regular expression.
 253         my $regex = glob2pat($pattern);
 254         # Check if the pattern matches the file name.
 255         if($file =~ m/($regex)/) {
 256                 # Parse the list of properties to set.
 257                 my @props = split(/;/, $properties);
 258                 foreach my $prop (@props) {
 259                         # Parse 'name=value' syntax and set the property.
 260                         if ($prop =~ /([^=]+)=(.*)/) {
 261                                 my ($n,$v) = ($1,$2);
 262                                 for ($n, $v) {
 263                                         s/^\s+//; s/\s+$//;
 264                                 }
 265                                 $self->change_file_prop($fbat, $n, $v);
 266                         }
 267                 }
 268         }
 269 }
 270
 271 sub apply_autoprops {
 272         my ($self, $file, $fbat) = @_;
 273         my $conf_t = ${$self->{config}}{'config'};
 274         no warnings 'once';
 275         # Check [miscellany]/enable-auto-props in svn configuration.
 276         if (SVN::_Core::svn_config_get_bool(
 277                 $conf_t,
 278                 $SVN::_Core::SVN_CONFIG_SECTION_MISCELLANY,
 279                 $SVN::_Core::SVN_CONFIG_OPTION_ENABLE_AUTO_PROPS,
 280                 0)) {
 281                 # Auto-props are enabled.  Enumerate them to look for matches.
 282                 my $callback = sub {
 283                         $self->check_autoprop($_[0], $_[1], $file, $fbat);
 284                 };
 285                 SVN::_Core::svn_config_enumerate(
 286                         $conf_t,
 287                         $SVN::_Core::SVN_CONFIG_SECTION_AUTO_PROPS,
 288                         $callback);
 289         }
 290 }
 291
 292 sub check_attr {
 293         my ($attr,$path) = @_;
 294         my $val = command_oneline("check-attr", $attr, "--", $path);
 295         if ($val) { $val =~ s/^[^:]*:\s*[^:]*:\s*(.*)\s*$/$1/; }
 296         return $val;
 297 }
 298
 299 sub apply_manualprops {
 300         my ($self, $file, $fbat) = @_;
 301         my $pending_properties = check_attr( "svn-properties", $file );
 302         if ($pending_properties eq "") { return; }
 303         # Parse the list of properties to set.
 304         my @props = split(/;/, $pending_properties);
 305         # TODO: get existing properties to compare to
 306         # - this fails for add so currently not done
 307         # my $existing_props = ::get_svnprops($file);
 308         my $existing_props = {};
 309         # TODO: caching svn properties or storing them in .gitattributes
 310         # would make that faster
 311         foreach my $prop (@props) {
 312                 # Parse 'name=value' syntax and set the property.
 313                 if ($prop =~ /([^=]+)=(.*)/) {
 314                         my ($n,$v) = ($1,$2);
 315                         for ($n, $v) {
 316                                 s/^\s+//; s/\s+$//;
 317                         }
 318                         my $existing = $existing_props->{$n};
 319                         if (!defined($existing) || $existing ne $v) {
 320                             $self->change_file_prop($fbat, $n, $v);
 321                         }
 322                 }
 323         }
 324 }
 325
 326 sub A {
 327         my ($self, $m, $deletions) = @_;
 328         my ($dir, $file) = split_path($m->{file_b});
 329         my $pbat = $self->ensure_path($dir, $deletions);
 330         my $fbat = $self->add_file($self->repo_path($m->{file_b}), $pbat,
 331                                         undef, -1);
 332         print "\tA\t$m->{file_b}\n" unless $::_q;
 333         $self->apply_autoprops($file, $fbat);
 334         $self->apply_manualprops($m->{file_b}, $fbat);
 335         $self->chg_file($fbat, $m);
 336         $self->close_file($fbat,undef,$self->{pool});
 337 }
 338
 339 sub C {
 340         my ($self, $m, $deletions) = @_;
 341         my ($dir, $file) = split_path($m->{file_b});
 342         my $pbat = $self->ensure_path($dir, $deletions);
 343         # workaround for a bug in svn serf backend (v1.8.5 and below):
 344         # store third argument to ->add_file() in a local variable, to make it
 345         # have the same lifetime as $fbat
 346         my $upa = $self->url_path($m->{file_a});
 347         my $fbat = $self->add_file($self->repo_path($m->{file_b}), $pbat,
 348                                 $upa, $self->{r});
 349         print "\tC\t$m->{file_a} => $m->{file_b}\n" unless $::_q;
 350         $self->apply_manualprops($m->{file_b}, $fbat);
 351         $self->chg_file($fbat, $m);
 352         $self->close_file($fbat,undef,$self->{pool});
 353 }
 354
 355 sub delete_entry {
 356         my ($self, $path, $pbat) = @_;
 357         my $rpath = $self->repo_path($path);
 358         my ($dir, $file) = split_path($rpath);
 359         $self->{rm}->{$dir} = 1;
 360         $self->SUPER::delete_entry($rpath, $self->{r}, $pbat, $self->{pool});
 361 }
 362
 363 sub R {
 364         my ($self, $m, $deletions) = @_;
 365         my ($dir, $file) = split_path($m->{file_b});
 366         my $pbat = $self->ensure_path($dir, $deletions);
 367         # workaround for a bug in svn serf backend, see comment in C() above
 368         my $upa = $self->url_path($m->{file_a});
 369         my $fbat = $self->add_file($self->repo_path($m->{file_b}), $pbat,
 370                                 $upa, $self->{r});
 371         print "\tR\t$m->{file_a} => $m->{file_b}\n" unless $::_q;
 372         $self->apply_autoprops($file, $fbat);
 373         $self->apply_manualprops($m->{file_b}, $fbat);
 374         $self->chg_file($fbat, $m);
 375         $self->close_file($fbat,undef,$self->{pool});
 376
 377         ($dir, $file) = split_path($m->{file_a});
 378         $pbat = $self->ensure_path($dir, $deletions);
 379         $self->delete_entry($m->{file_a}, $pbat);
 380 }
 381
 382 sub M {
 383         my ($self, $m, $deletions) = @_;
 384         my ($dir, $file) = split_path($m->{file_b});
 385         my $pbat = $self->ensure_path($dir, $deletions);
 386         my $fbat = $self->open_file($self->repo_path($m->{file_b}),
 387                                 $pbat,$self->{r},$self->{pool});
 388         print "\t$m->{chg}\t$m->{file_b}\n" unless $::_q;
 389         $self->apply_manualprops($m->{file_b}, $fbat);
 390         $self->chg_file($fbat, $m);
 391         $self->close_file($fbat,undef,$self->{pool});
 392 }
 393
 394 sub T {
 395         my ($self, $m, $deletions) = @_;
 396
 397         # Work around subversion issue 4091: toggling the "is a
 398         # symlink" property requires removing and re-adding a
 399         # file or else "svn up" on affected clients trips an
 400         # assertion and aborts.
 401         if (($m->{mode_b} =~ /^120/ && $m->{mode_a} !~ /^120/) ||
 402             ($m->{mode_b} !~ /^120/ && $m->{mode_a} =~ /^120/)) {
 403                 $self->D({
 404                         mode_a => $m->{mode_a}, mode_b => '000000',
 405                         sha1_a => $m->{sha1_a}, sha1_b => '0' x 40,
 406                         chg => 'D', file_b => $m->{file_b}
 407                 }, $deletions);
 408                 $self->A({
 409                         mode_a => '000000', mode_b => $m->{mode_b},
 410                         sha1_a => '0' x 40, sha1_b => $m->{sha1_b},
 411                         chg => 'A', file_b => $m->{file_b}
 412                 }, $deletions);
 413                 return;
 414         }
 415
 416         $self->M($m, $deletions);
 417 }
 418
 419 sub change_file_prop {
 420         my ($self, $fbat, $pname, $pval) = @_;
 421         $self->SUPER::change_file_prop($fbat, $pname, $pval, $self->{pool});
 422 }
 423
 424 sub change_dir_prop {
 425         my ($self, $pbat, $pname, $pval) = @_;
 426         $self->SUPER::change_dir_prop($pbat, $pname, $pval, $self->{pool});
 427 }
 428
 429 sub _chg_file_get_blob ($$$$) {
 430         my ($self, $fbat, $m, $which) = @_;
 431         my $fh = $::_repository->temp_acquire("git_blob_$which");
 432         if ($m->{"mode_$which"} =~ /^120/) {
 433                 print $fh 'link ' or croak $!;
 434                 $self->change_file_prop($fbat,'svn:special','*');
 435         } elsif ($m->{mode_a} =~ /^120/ && $m->{"mode_$which"} !~ /^120/) {
 436                 $self->change_file_prop($fbat,'svn:special',undef);
 437         }
 438         my $blob = $m->{"sha1_$which"};
 439         return ($fh,) if ($blob =~ /^0{40}$/);
 440         my $size = $::_repository->cat_blob($blob, $fh);
 441         croak "Failed to read object $blob" if ($size < 0);
 442         $fh->flush == 0 or croak $!;
 443         seek $fh, 0, 0 or croak $!;
 444
 445         my $exp = ::md5sum($fh);
 446         seek $fh, 0, 0 or croak $!;
 447         return ($fh, $exp);
 448 }
 449
 450 sub chg_file {
 451         my ($self, $fbat, $m) = @_;
 452         if ($m->{mode_b} =~ /755$/ && $m->{mode_a} !~ /755$/) {
 453                 $self->change_file_prop($fbat,'svn:executable','*');
 454         } elsif ($m->{mode_b} !~ /755$/ && $m->{mode_a} =~ /755$/) {
 455                 $self->change_file_prop($fbat,'svn:executable',undef);
 456         }
 457         my ($fh_a, $exp_a) = _chg_file_get_blob $self, $fbat, $m, 'a';
 458         my ($fh_b, $exp_b) = _chg_file_get_blob $self, $fbat, $m, 'b';
 459         my $pool = SVN::Pool->new;
 460         my $atd = $self->apply_textdelta($fbat, $exp_a, $pool);
 461         if (-s $fh_a) {
 462                 my $txstream = SVN::TxDelta::new ($fh_a, $fh_b, $pool);
 463                 my $res = SVN::TxDelta::send_txstream($txstream, @$atd, $pool);
 464                 if (defined $res) {
 465                         die "Unexpected result from send_txstream: $res\n",
 466                             "(SVN::Core::VERSION: $SVN::Core::VERSION)\n";
 467                 }
 468         } else {
 469                 my $got = SVN::TxDelta::send_stream($fh_b, @$atd, $pool);
 470                 die "Checksum mismatch\nexpected: $exp_b\ngot: $got\n"
 471                     if ($got ne $exp_b);
 472         }
 473         Git::temp_release($fh_b, 1);
 474         Git::temp_release($fh_a, 1);
 475         $pool->clear;
 476 }
 477
 478 sub D {
 479         my ($self, $m, $deletions) = @_;
 480         my ($dir, $file) = split_path($m->{file_b});
 481         my $pbat = $self->ensure_path($dir, $deletions);
 482         print "\tD\t$m->{file_b}\n" unless $::_q;
 483         $self->delete_entry($m->{file_b}, $pbat);
 484 }
 485
 486 sub close_edit {
 487         my ($self) = @_;
 488         my ($p,$bat) = ($self->{pool}, $self->{bat});
 489         foreach (sort { $b =~ tr#/#/# <=> $a =~ tr#/#/# } keys %$bat) {
 490                 next if $_ eq '';
 491                 $self->close_directory($bat->{$_}, $p);
 492         }
 493         $self->close_directory($bat->{''}, $p);
 494         $self->SUPER::close_edit($p);
 495         $p->clear;
 496 }
 497
 498 sub abort_edit {
 499         my ($self) = @_;
 500         $self->SUPER::abort_edit($self->{pool});
 501 }
 502
 503 sub DESTROY {
 504         my $self = shift;
 505         $self->SUPER::DESTROY(@_);
 506         $self->{pool}->clear;
 507 }
 508
 509 # this drives the editor
 510 sub apply_diff {
 511         my ($self) = @_;
 512         my $mods = $self->{mods};
 513         my %o = ( D => 0, C => 1, R => 2, A => 3, M => 4, T => 5 );
 514         my %deletions;
 515
 516         foreach my $m (@$mods) {
 517                 if ($m->{chg} eq "D") {
 518                         $deletions{$m->{file_b}} = 1;
 519                 }
 520         }
 521
 522         foreach my $m (sort { $o{$a->{chg}} <=> $o{$b->{chg}} } @$mods) {
 523                 my $f = $m->{chg};
 524                 if (defined $o{$f}) {
 525                         $self->$f($m, \%deletions);
 526                 } else {
 527                         fatal("Invalid change type: $f");
 528                 }
 529         }
 530
 531         if (defined($self->{mergeinfo})) {
 532                 $self->change_dir_prop($self->{bat}{''}, "svn:mergeinfo",
 533                                        $self->{mergeinfo});
 534         }
 535         $self->rmdirs if $_rmdir;
 536         if (@$mods == 0 && !defined($self->{mergeinfo})) {
 537                 $self->abort_edit;
 538         } else {
 539                 $self->close_edit;
 540         }
 541         return scalar @$mods;
 542 }
 543
 544 1;
 545 __END__
 546
 547 =head1 NAME
 548
 549 Git::SVN::Editor - commit driver for "git svn set-tree" and dcommit
 550
 551 =head1 SYNOPSIS
 552
 553         use Git::SVN::Editor;
 554         use Git::SVN::Ra;
 555
 556         my $ra = Git::SVN::Ra->new($url);
 557         my %opts = (
 558                 r => 19,
 559                 log => "log message",
 560                 ra => $ra,
 561                 config => SVN::Core::config_get_config($svn_config_dir),
 562                 tree_a => "$commit^",
 563                 tree_b => "$commit",
 564                 editor_cb => sub { print "Committed r$_[0]\n"; },
 565                 mergeinfo => "/branches/foo:1-10",
 566                 svn_path => "trunk"
 567         );
 568         Git::SVN::Editor->new(\%opts)->apply_diff or print "No changes\n";
 569
 570         my $re = Git::SVN::Editor::glob2pat("trunk/*");
 571         if ($branchname =~ /$re/) {
 572                 print "matched!\n";
 573         }
 574
 575 =head1 DESCRIPTION
 576
 577 This module is an implementation detail of the "git svn" command.
 578 Do not use it unless you are developing git-svn.
 579
 580 This module adapts the C<SVN::Delta::Editor> object returned by
 581 C<SVN::Delta::get_commit_editor> and drives it to convey the
 582 difference between two git tree objects to a remote Subversion
 583 repository.
 584
 585 The interface will change as git-svn evolves.
 586
 587 =head1 DEPENDENCIES
 588
 589 Subversion perl bindings,
 590 the core L<Carp> module,
 591 and git's L<Git> helper module.
 592
 593 C<Git::SVN::Editor> has not been tested using callers other than
 594 B<git-svn> itself.
 595
 596 =head1 SEE ALSO
 597
 598 L<SVN::Delta>,
 599 L<Git::SVN::Fetcher>.
 600
 601 =head1 INCOMPATIBILITIES
 602
 603 None reported.
 604
 605 =head1 BUGS
 606
 607 None.