git-svnimport.perl

   1 #!/usr/bin/perl -w
   2
   3 # This tool is copyright (c) 2005, Matthias Urlichs.
   4 # It is released under the Gnu Public License, version 2.
   5 #
   6 # The basic idea is to pull and analyze SVN changes.
   7 #
   8 # Checking out the files is done by a single long-running SVN connection.
   9 #
  10 # The head revision is on branch "origin" by default.
  11 # You can change that with the '-o' option.
  12
  13 use strict;
  14 use warnings;
  15 use Getopt::Std;
  16 use File::Copy;
  17 use File::Spec;
  18 use File::Temp qw(tempfile);
  19 use File::Path qw(mkpath);
  20 use File::Basename qw(basename dirname);
  21 use Time::Local;
  22 use IO::Pipe;
  23 use POSIX qw(strftime dup2);
  24 use IPC::Open2;
  25 use SVN::Core;
  26 use SVN::Ra;
  27
  28 die "Need SVN:Core 1.2.1 or better" if $SVN::Core::VERSION lt "1.2.1";
  29
  30 $SIG{'PIPE'}="IGNORE";
  31 $ENV{'TZ'}="UTC";
  32
  33 our($opt_h,$opt_o,$opt_v,$opt_u,$opt_C,$opt_i,$opt_m,$opt_M,$opt_t,$opt_T,
  34     $opt_b,$opt_r,$opt_I,$opt_A,$opt_s,$opt_l,$opt_d,$opt_D);
  35
  36 sub usage() {
  37         print STDERR <<END;
  38 Usage: ${\basename $0}     # fetch/update GIT from SVN
  39        [-o branch-for-HEAD] [-h] [-v] [-l max_rev]
  40        [-C GIT_repository] [-t tagname] [-T trunkname] [-b branchname]
  41        [-d|-D] [-i] [-u] [-r] [-I ignorefilename] [-s start_chg]
  42        [-m] [-M regex] [-A author_file] [SVN_URL]
  43 END
  44         exit(1);
  45 }
  46
  47 getopts("A:b:C:dDhiI:l:mM:o:rs:t:T:uv") or usage();
  48 usage if $opt_h;
  49
  50 my $tag_name = $opt_t || "tags";
  51 my $trunk_name = $opt_T || "trunk";
  52 my $branch_name = $opt_b || "branches";
  53
  54 @ARGV == 1 or @ARGV == 2 or usage();
  55
  56 $opt_o ||= "origin";
  57 $opt_s ||= 1;
  58 my $git_tree = $opt_C;
  59 $git_tree ||= ".";
  60
  61 my $svn_url = $ARGV[0];
  62 my $svn_dir = $ARGV[1];
  63
  64 our @mergerx = ();
  65 if ($opt_m) {
  66         @mergerx = ( qr/\W(?:from|of|merge|merging|merged) (\w+)/i );
  67 }
  68 if ($opt_M) {
  69         push (@mergerx, qr/$opt_M/);
  70 }
  71
  72 # Absolutize filename now, since we will have chdir'ed by the time we
  73 # get around to opening it.
  74 $opt_A = File::Spec->rel2abs($opt_A) if $opt_A;
  75
  76 our %users = ();
  77 our $users_file = undef;
  78 sub read_users($) {
  79         $users_file = File::Spec->rel2abs(@_);
  80         die "Cannot open $users_file\n" unless -f $users_file;
  81         open(my $authors,$users_file);
  82         while(<$authors>) {
  83                 chomp;
  84                 next unless /^(\S+?)\s*=\s*(.+?)\s*<(.+)>\s*$/;
  85                 (my $user,my $name,my $email) = ($1,$2,$3);
  86                 $users{$user} = [$name,$email];
  87         }
  88         close($authors);
  89 }
  90
  91 select(STDERR); $|=1; select(STDOUT);
  92
  93
  94 package SVNconn;
  95 # Basic SVN connection.
  96 # We're only interested in connecting and downloading, so ...
  97
  98 use File::Spec;
  99 use File::Temp qw(tempfile);
 100 use POSIX qw(strftime dup2);
 101 use Fcntl qw(SEEK_SET);
 102
 103 sub new {
 104         my($what,$repo) = @_;
 105         $what=ref($what) if ref($what);
 106
 107         my $self = {};
 108         $self->{'buffer'} = "";
 109         bless($self,$what);
 110
 111         $repo =~ s#/+$##;
 112         $self->{'fullrep'} = $repo;
 113         $self->conn();
 114
 115         return $self;
 116 }
 117
 118 sub conn {
 119         my $self = shift;
 120         my $repo = $self->{'fullrep'};
 121         my $auth = SVN::Core::auth_open ([SVN::Client::get_simple_provider,
 122                           SVN::Client::get_ssl_server_trust_file_provider,
 123                           SVN::Client::get_username_provider]);
 124         my $s = SVN::Ra->new(url => $repo, auth => $auth);
 125         die "SVN connection to $repo: $!\n" unless defined $s;
 126         $self->{'svn'} = $s;
 127         $self->{'repo'} = $repo;
 128         $self->{'maxrev'} = $s->get_latest_revnum();
 129 }
 130
 131 sub file {
 132         my($self,$path,$rev) = @_;
 133
 134         my ($fh, $name) = tempfile('gitsvn.XXXXXX',
 135                     DIR => File::Spec->tmpdir(), UNLINK => 1);
 136
 137         print "... $rev $path ...\n" if $opt_v;
 138         my (undef, $properties);
 139         my $pool = SVN::Pool->new();
 140         eval { (undef, $properties)
 141                    = $self->{'svn'}->get_file($path,$rev,$fh,$pool); };
 142         $pool->clear;
 143         if($@) {
 144                 return undef if $@ =~ /Attempted to get checksum/;
 145                 die $@;
 146         }
 147         my $mode;
 148         if (exists $properties->{'svn:executable'}) {
 149                 $mode = '100755';
 150         } elsif (exists $properties->{'svn:special'}) {
 151                 my ($special_content, $filesize);
 152                 $filesize = tell $fh;
 153                 seek $fh, 0, SEEK_SET;
 154                 read $fh, $special_content, $filesize;
 155                 if ($special_content =~ s/^link //) {
 156                         $mode = '120000';
 157                         seek $fh, 0, SEEK_SET;
 158                         truncate $fh, 0;
 159                         print $fh $special_content;
 160                 } else {
 161                         die "unexpected svn:special file encountered";
 162                 }
 163         } else {
 164                 $mode = '100644';
 165         }
 166         close ($fh);
 167
 168         return ($name, $mode);
 169 }
 170
 171 sub ignore {
 172         my($self,$path,$rev) = @_;
 173
 174         print "... $rev $path ...\n" if $opt_v;
 175         my (undef,undef,$properties)
 176             = $self->{'svn'}->get_dir($path,$rev,undef);
 177         if (exists $properties->{'svn:ignore'}) {
 178                 my ($fh, $name) = tempfile('gitsvn.XXXXXX',
 179                                            DIR => File::Spec->tmpdir(),
 180                                            UNLINK => 1);
 181                 print $fh $properties->{'svn:ignore'};
 182                 close($fh);
 183                 return $name;
 184         } else {
 185                 return undef;
 186         }
 187 }
 188
 189 package main;
 190 use URI;
 191
 192 our $svn = $svn_url;
 193 $svn .= "/$svn_dir" if defined $svn_dir;
 194 my $svn2 = SVNconn->new($svn);
 195 $svn = SVNconn->new($svn);
 196
 197 my $lwp_ua;
 198 if($opt_d or $opt_D) {
 199         $svn_url = URI->new($svn_url)->canonical;
 200         if($opt_D) {
 201                 $svn_dir =~ s#/*$#/#;
 202         } else {
 203                 $svn_dir = "";
 204         }
 205         if ($svn_url->scheme eq "http") {
 206                 use LWP::UserAgent;
 207                 $lwp_ua = LWP::UserAgent->new(keep_alive => 1, requests_redirectable => []);
 208         } else {
 209                 print STDERR "Warning: not HTTP; turning off direct file access\n";
 210                 $opt_d=0;
 211         }
 212 }
 213
 214 sub pdate($) {
 215         my($d) = @_;
 216         $d =~ m#(\d\d\d\d)-(\d\d)-(\d\d)T(\d\d):(\d\d):(\d\d)#
 217                 or die "Unparseable date: $d\n";
 218         my $y=$1; $y-=1900 if $y>1900;
 219         return timegm($6||0,$5,$4,$3,$2-1,$y);
 220 }
 221
 222 sub getwd() {
 223         my $pwd = `pwd`;
 224         chomp $pwd;
 225         return $pwd;
 226 }
 227
 228
 229 sub get_headref($$) {
 230     my $name    = shift;
 231     my $git_dir = shift;
 232     my $sha;
 233
 234     if (open(C,"$git_dir/refs/heads/$name")) {
 235         chomp($sha = <C>);
 236         close(C);
 237         length($sha) == 40
 238             or die "Cannot get head id for $name ($sha): $!\n";
 239     }
 240     return $sha;
 241 }
 242
 243
 244 -d $git_tree
 245         or mkdir($git_tree,0777)
 246         or die "Could not create $git_tree: $!";
 247 chdir($git_tree);
 248
 249 my $orig_branch = "";
 250 my $forward_master = 0;
 251 my %branches;
 252
 253 my $git_dir = $ENV{"GIT_DIR"} || ".git";
 254 $git_dir = getwd()."/".$git_dir unless $git_dir =~ m#^/#;
 255 $ENV{"GIT_DIR"} = $git_dir;
 256 my $orig_git_index;
 257 $orig_git_index = $ENV{GIT_INDEX_FILE} if exists $ENV{GIT_INDEX_FILE};
 258 my ($git_ih, $git_index) = tempfile('gitXXXXXX', SUFFIX => '.idx',
 259                                     DIR => File::Spec->tmpdir());
 260 close ($git_ih);
 261 $ENV{GIT_INDEX_FILE} = $git_index;
 262 my $maxnum = 0;
 263 my $last_rev = "";
 264 my $last_branch;
 265 my $current_rev = $opt_s || 1;
 266 unless(-d $git_dir) {
 267         system("git-init-db");
 268         die "Cannot init the GIT db at $git_tree: $?\n" if $?;
 269         system("git-read-tree");
 270         die "Cannot init an empty tree: $?\n" if $?;
 271
 272         $last_branch = $opt_o;
 273         $orig_branch = "";
 274 } else {
 275         -f "$git_dir/refs/heads/$opt_o"
 276                 or die "Branch '$opt_o' does not exist.\n".
 277                        "Either use the correct '-o branch' option,\n".
 278                        "or import to a new repository.\n";
 279
 280         -f "$git_dir/svn2git"
 281                 or die "'$git_dir/svn2git' does not exist.\n".
 282                        "You need that file for incremental imports.\n";
 283         open(F, "git-symbolic-ref HEAD |") or
 284                 die "Cannot run git-symbolic-ref: $!\n";
 285         chomp ($last_branch = <F>);
 286         $last_branch = basename($last_branch);
 287         close(F);
 288         unless($last_branch) {
 289                 warn "Cannot read the last branch name: $! -- assuming 'master'\n";
 290                 $last_branch = "master";
 291         }
 292         $orig_branch = $last_branch;
 293         $last_rev = get_headref($orig_branch, $git_dir);
 294         if (-f "$git_dir/SVN2GIT_HEAD") {
 295                 die <<EOM;
 296 SVN2GIT_HEAD exists.
 297 Make sure your working directory corresponds to HEAD and remove SVN2GIT_HEAD.
 298 You may need to run
 299
 300     git-read-tree -m -u SVN2GIT_HEAD HEAD
 301 EOM
 302         }
 303         system('cp', "$git_dir/HEAD", "$git_dir/SVN2GIT_HEAD");
 304
 305         $forward_master =
 306             $opt_o ne 'master' && -f "$git_dir/refs/heads/master" &&
 307             system('cmp', '-s', "$git_dir/refs/heads/master",
 308                                 "$git_dir/refs/heads/$opt_o") == 0;
 309
 310         # populate index
 311         system('git-read-tree', $last_rev);
 312         die "read-tree failed: $?\n" if $?;
 313
 314         # Get the last import timestamps
 315         open my $B,"<", "$git_dir/svn2git";
 316         while(<$B>) {
 317                 chomp;
 318                 my($num,$branch,$ref) = split;
 319                 $branches{$branch}{$num} = $ref;
 320                 $branches{$branch}{"LAST"} = $ref;
 321                 $current_rev = $num+1 if $current_rev <= $num;
 322         }
 323         close($B);
 324 }
 325 -d $git_dir
 326         or die "Could not create git subdir ($git_dir).\n";
 327
 328 my $default_authors = "$git_dir/svn-authors";
 329 if ($opt_A) {
 330         read_users($opt_A);
 331         copy($opt_A,$default_authors) or die "Copy failed: $!";
 332 } else {
 333         read_users($default_authors) if -f $default_authors;
 334 }
 335
 336 open BRANCHES,">>", "$git_dir/svn2git";
 337
 338 sub node_kind($$$) {
 339         my ($branch, $path, $revision) = @_;
 340         my $pool=SVN::Pool->new;
 341         my $kind = $svn->{'svn'}->check_path(revert_split_path($branch,$path),$revision,$pool);
 342         $pool->clear;
 343         return $kind;
 344 }
 345
 346 sub revert_split_path($$) {
 347         my($branch,$path) = @_;
 348
 349         my $svnpath;
 350         $path = "" if $path eq "/"; # this should not happen, but ...
 351         if($branch eq "/") {
 352                 $svnpath = "$trunk_name/$path";
 353         } elsif($branch =~ m#^/#) {
 354                 $svnpath = "$tag_name$branch/$path";
 355         } else {
 356                 $svnpath = "$branch_name/$branch/$path";
 357         }
 358
 359         $svnpath =~ s#/+$##;
 360         return $svnpath;
 361 }
 362
 363 sub get_file($$$) {
 364         my($rev,$branch,$path) = @_;
 365
 366         my $svnpath = revert_split_path($branch,$path);
 367
 368         # now get it
 369         my ($name,$mode);
 370         if($opt_d) {
 371                 my($req,$res);
 372
 373                 # /svn/!svn/bc/2/django/trunk/django-docs/build.py
 374                 my $url=$svn_url->clone();
 375                 $url->path($url->path."/!svn/bc/$rev/$svn_dir$svnpath");
 376                 print "... $path...\n" if $opt_v;
 377                 $req = HTTP::Request->new(GET => $url);
 378                 $res = $lwp_ua->request($req);
 379                 if ($res->is_success) {
 380                         my $fh;
 381                         ($fh, $name) = tempfile('gitsvn.XXXXXX',
 382                         DIR => File::Spec->tmpdir(), UNLINK => 1);
 383                         print $fh $res->content;
 384                         close($fh) or die "Could not write $name: $!\n";
 385                 } else {
 386                         return undef if $res->code == 301; # directory?
 387                         die $res->status_line." at $url\n";
 388                 }
 389                 $mode = '0644'; # can't obtain mode via direct http request?
 390         } else {
 391                 ($name,$mode) = $svn->file("$svnpath",$rev);
 392                 return undef unless defined $name;
 393         }
 394
 395         my $pid = open(my $F, '-|');
 396         die $! unless defined $pid;
 397         if (!$pid) {
 398             exec("git-hash-object", "-w", $name)
 399                 or die "Cannot create object: $!\n";
 400         }
 401         my $sha = <$F>;
 402         chomp $sha;
 403         close $F;
 404         unlink $name;
 405         return [$mode, $sha, $path];
 406 }
 407
 408 sub get_ignore($$$$$) {
 409         my($new,$old,$rev,$branch,$path) = @_;
 410
 411         return unless $opt_I;
 412         my $svnpath = revert_split_path($branch,$path);
 413         my $name = $svn->ignore("$svnpath",$rev);
 414         if ($path eq '/') {
 415                 $path = $opt_I;
 416         } else {
 417                 $path = File::Spec->catfile($path,$opt_I);
 418         }
 419         if (defined $name) {
 420                 my $pid = open(my $F, '-|');
 421                 die $! unless defined $pid;
 422                 if (!$pid) {
 423                         exec("git-hash-object", "-w", $name)
 424                             or die "Cannot create object: $!\n";
 425                 }
 426                 my $sha = <$F>;
 427                 chomp $sha;
 428                 close $F;
 429                 unlink $name;
 430                 push(@$new,['0644',$sha,$path]);
 431         } else {
 432                 push(@$old,$path);
 433         }
 434 }
 435
 436 sub split_path($$) {
 437         my($rev,$path) = @_;
 438         my $branch;
 439
 440         if($path =~ s#^/\Q$tag_name\E/([^/]+)/?##) {
 441                 $branch = "/$1";
 442         } elsif($path =~ s#^/\Q$trunk_name\E/?##) {
 443                 $branch = "/";
 444         } elsif($path =~ s#^/\Q$branch_name\E/([^/]+)/?##) {
 445                 $branch = $1;
 446         } else {
 447                 my %no_error = (
 448                         "/" => 1,
 449                         "/$tag_name" => 1,
 450                         "/$branch_name" => 1
 451                 );
 452                 print STDERR "$rev: Unrecognized path: $path\n" unless (defined $no_error{$path});
 453                 return ()
 454         }
 455         $path = "/" if $path eq "";
 456         return ($branch,$path);
 457 }
 458
 459 sub branch_rev($$) {
 460
 461         my ($srcbranch,$uptorev) = @_;
 462
 463         my $bbranches = $branches{$srcbranch};
 464         my @revs = reverse sort { ($a eq 'LAST' ? 0 : $a) <=> ($b eq 'LAST' ? 0 : $b) } keys %$bbranches;
 465         my $therev;
 466         foreach my $arev(@revs) {
 467                 next if  ($arev eq 'LAST');
 468                 if ($arev <= $uptorev) {
 469                         $therev = $arev;
 470                         last;
 471                 }
 472         }
 473         return $therev;
 474 }
 475
 476 sub copy_path($$$$$$$$) {
 477         # Somebody copied a whole subdirectory.
 478         # We need to find the index entries from the old version which the
 479         # SVN log entry points to, and add them to the new place.
 480
 481         my($newrev,$newbranch,$path,$oldpath,$rev,$node_kind,$new,$parents) = @_;
 482
 483         my($srcbranch,$srcpath) = split_path($rev,$oldpath);
 484         unless(defined $srcbranch) {
 485                 print "Path not found when copying from $oldpath @ $rev\n";
 486                 return;
 487         }
 488         my $therev = branch_rev($srcbranch, $rev);
 489         my $gitrev = $branches{$srcbranch}{$therev};
 490         unless($gitrev) {
 491                 print STDERR "$newrev:$newbranch: could not find $oldpath \@ $rev\n";
 492                 return;
 493         }
 494         if ($srcbranch ne $newbranch) {
 495                 push(@$parents, $branches{$srcbranch}{'LAST'});
 496         }
 497         print "$newrev:$newbranch:$path: copying from $srcbranch:$srcpath @ $rev\n" if $opt_v;
 498         if ($node_kind eq $SVN::Node::dir) {
 499                         $srcpath =~ s#/*$#/#;
 500         }
 501
 502         my $pid = open my $f,'-|';
 503         die $! unless defined $pid;
 504         if (!$pid) {
 505                 exec("git-ls-tree","-r","-z",$gitrev,$srcpath)
 506                         or die $!;
 507         }
 508         local $/ = "\0";
 509         while(<$f>) {
 510                 chomp;
 511                 my($m,$p) = split(/\t/,$_,2);
 512                 my($mode,$type,$sha1) = split(/ /,$m);
 513                 next if $type ne "blob";
 514                 if ($node_kind eq $SVN::Node::dir) {
 515                         $p = $path . substr($p,length($srcpath)-1);
 516                 } else {
 517                         $p = $path;
 518                 }
 519                 push(@$new,[$mode,$sha1,$p]);
 520         }
 521         close($f) or
 522                 print STDERR "$newrev:$newbranch: could not list files in $oldpath \@ $rev\n";
 523 }
 524
 525 sub commit {
 526         my($branch, $changed_paths, $revision, $author, $date, $message) = @_;
 527         my($author_name,$author_email,$dest);
 528         my(@old,@new,@parents);
 529
 530         if (not defined $author) {
 531                 $author_name = $author_email = "unknown";
 532         } elsif (defined $users_file) {
 533                 die "User $author is not listed in $users_file\n"
 534                     unless exists $users{$author};
 535                 ($author_name,$author_email) = @{$users{$author}};
 536         } elsif ($author =~ /^(.*?)\s+<(.*)>$/) {
 537                 ($author_name, $author_email) = ($1, $2);
 538         } else {
 539                 $author =~ s/^<(.*)>$/$1/;
 540                 $author_name = $author_email = $author;
 541         }
 542         $date = pdate($date);
 543
 544         my $tag;
 545         my $parent;
 546         if($branch eq "/") { # trunk
 547                 $parent = $opt_o;
 548         } elsif($branch =~ m#^/(.+)#) { # tag
 549                 $tag = 1;
 550                 $parent = $1;
 551         } else { # "normal" branch
 552                 # nothing to do
 553                 $parent = $branch;
 554         }
 555         $dest = $parent;
 556
 557         my $prev = $changed_paths->{"/"};
 558         if($prev and $prev->[0] eq "A") {
 559                 delete $changed_paths->{"/"};
 560                 my $oldpath = $prev->[1];
 561                 my $rev;
 562                 if(defined $oldpath) {
 563                         my $p;
 564                         ($parent,$p) = split_path($revision,$oldpath);
 565                         if($parent eq "/") {
 566                                 $parent = $opt_o;
 567                         } else {
 568                                 $parent =~ s#^/##; # if it's a tag
 569                         }
 570                 } else {
 571                         $parent = undef;
 572                 }
 573         }
 574
 575         my $rev;
 576         if($revision > $opt_s and defined $parent) {
 577                 open(H,"git-rev-parse --verify $parent |");
 578                 $rev = <H>;
 579                 close(H) or do {
 580                         print STDERR "$revision: cannot find commit '$parent'!\n";
 581                         return;
 582                 };
 583                 chop $rev;
 584                 if(length($rev) != 40) {
 585                         print STDERR "$revision: cannot find commit '$parent'!\n";
 586                         return;
 587                 }
 588                 $rev = $branches{($parent eq $opt_o) ? "/" : $parent}{"LAST"};
 589                 if($revision != $opt_s and not $rev) {
 590                         print STDERR "$revision: do not know ancestor for '$parent'!\n";
 591                         return;
 592                 }
 593         } else {
 594                 $rev = undef;
 595         }
 596
 597 #       if($prev and $prev->[0] eq "A") {
 598 #               if(not $tag) {
 599 #                       unless(open(H,"> $git_dir/refs/heads/$branch")) {
 600 #                               print STDERR "$revision: Could not create branch $branch: $!\n";
 601 #                               $state=11;
 602 #                               next;
 603 #                       }
 604 #                       print H "$rev\n"
 605 #                               or die "Could not write branch $branch: $!";
 606 #                       close(H)
 607 #                               or die "Could not write branch $branch: $!";
 608 #               }
 609 #       }
 610         if(not defined $rev) {
 611                 unlink($git_index);
 612         } elsif ($rev ne $last_rev) {
 613                 print "Switching from $last_rev to $rev ($branch)\n" if $opt_v;
 614                 system("git-read-tree", $rev);
 615                 die "read-tree failed for $rev: $?\n" if $?;
 616                 $last_rev = $rev;
 617         }
 618
 619         push (@parents, $rev) if defined $rev;
 620
 621         my $cid;
 622         if($tag and not %$changed_paths) {
 623                 $cid = $rev;
 624         } else {
 625                 my @paths = sort keys %$changed_paths;
 626                 foreach my $path(@paths) {
 627                         my $action = $changed_paths->{$path};
 628
 629                         if ($action->[0] eq "R") {
 630                                 # refer to a file/tree in an earlier commit
 631                                 push(@old,$path); # remove any old stuff
 632                         }
 633                         if(($action->[0] eq "A") || ($action->[0] eq "R")) {
 634                                 my $node_kind = node_kind($branch,$path,$revision);
 635                                 if ($node_kind eq $SVN::Node::file) {
 636                                         my $f = get_file($revision,$branch,$path);
 637                                         if ($f) {
 638                                                 push(@new,$f) if $f;
 639                                         } else {
 640                                                 my $opath = $action->[3];
 641                                                 print STDERR "$revision: $branch: could not fetch '$opath'\n";
 642                                         }
 643                                 } elsif ($node_kind eq $SVN::Node::dir) {
 644                                         if($action->[1]) {
 645                                                 copy_path($revision, $branch,
 646                                                           $path, $action->[1],
 647                                                           $action->[2], $node_kind,
 648                                                           \@new, \@parents);
 649                                         } else {
 650                                                 get_ignore(\@new, \@old, $revision,
 651                                                            $branch, $path);
 652                                         }
 653                                 }
 654                         } elsif ($action->[0] eq "D") {
 655                                 push(@old,$path);
 656                         } elsif ($action->[0] eq "M") {
 657                                 my $node_kind = node_kind($branch,$path,$revision);
 658                                 if ($node_kind eq $SVN::Node::file) {
 659                                         my $f = get_file($revision,$branch,$path);
 660                                         push(@new,$f) if $f;
 661                                 } elsif ($node_kind eq $SVN::Node::dir) {
 662                                         get_ignore(\@new, \@old, $revision,
 663                                                    $branch,$path);
 664                                 }
 665                         } else {
 666                                 die "$revision: unknown action '".$action->[0]."' for $path\n";
 667                         }
 668                 }
 669
 670                 while(@old) {
 671                         my @o1;
 672                         if(@old > 55) {
 673                                 @o1 = splice(@old,0,50);
 674                         } else {
 675                                 @o1 = @old;
 676                                 @old = ();
 677                         }
 678                         my $pid = open my $F, "-|";
 679                         die "$!" unless defined $pid;
 680                         if (!$pid) {
 681                                 exec("git-ls-files", "-z", @o1) or die $!;
 682                         }
 683                         @o1 = ();
 684                         local $/ = "\0";
 685                         while(<$F>) {
 686                                 chomp;
 687                                 push(@o1,$_);
 688                         }
 689                         close($F);
 690
 691                         while(@o1) {
 692                                 my @o2;
 693                                 if(@o1 > 55) {
 694                                         @o2 = splice(@o1,0,50);
 695                                 } else {
 696                                         @o2 = @o1;
 697                                         @o1 = ();
 698                                 }
 699                                 system("git-update-index","--force-remove","--",@o2);
 700                                 die "Cannot remove files: $?\n" if $?;
 701                         }
 702                 }
 703                 while(@new) {
 704                         my @n2;
 705                         if(@new > 12) {
 706                                 @n2 = splice(@new,0,10);
 707                         } else {
 708                                 @n2 = @new;
 709                                 @new = ();
 710                         }
 711                         system("git-update-index","--add",
 712                                 (map { ('--cacheinfo', @$_) } @n2));
 713                         die "Cannot add files: $?\n" if $?;
 714                 }
 715
 716                 my $pid = open(C,"-|");
 717                 die "Cannot fork: $!" unless defined $pid;
 718                 unless($pid) {
 719                         exec("git-write-tree");
 720                         die "Cannot exec git-write-tree: $!\n";
 721                 }
 722                 chomp(my $tree = <C>);
 723                 length($tree) == 40
 724                         or die "Cannot get tree id ($tree): $!\n";
 725                 close(C)
 726                         or die "Error running git-write-tree: $?\n";
 727                 print "Tree ID $tree\n" if $opt_v;
 728
 729                 my $pr = IO::Pipe->new() or die "Cannot open pipe: $!\n";
 730                 my $pw = IO::Pipe->new() or die "Cannot open pipe: $!\n";
 731                 $pid = fork();
 732                 die "Fork: $!\n" unless defined $pid;
 733                 unless($pid) {
 734                         $pr->writer();
 735                         $pw->reader();
 736                         open(OUT,">&STDOUT");
 737                         dup2($pw->fileno(),0);
 738                         dup2($pr->fileno(),1);
 739                         $pr->close();
 740                         $pw->close();
 741
 742                         my @par = ();
 743
 744                         # loose detection of merges
 745                         # based on the commit msg
 746                         foreach my $rx (@mergerx) {
 747                                 if ($message =~ $rx) {
 748                                         my $mparent = $1;
 749                                         if ($mparent eq 'HEAD') { $mparent = $opt_o };
 750                                         if ( -e "$git_dir/refs/heads/$mparent") {
 751                                                 $mparent = get_headref($mparent, $git_dir);
 752                                                 push (@parents, $mparent);
 753                                                 print OUT "Merge parent branch: $mparent\n" if $opt_v;
 754                                         }
 755                                 }
 756                         }
 757                         my %seen_parents = ();
 758                         my @unique_parents = grep { ! $seen_parents{$_} ++ } @parents;
 759                         foreach my $bparent (@unique_parents) {
 760                                 push @par, '-p', $bparent;
 761                                 print OUT "Merge parent branch: $bparent\n" if $opt_v;
 762                         }
 763
 764                         exec("env",
 765                                 "GIT_AUTHOR_NAME=$author_name",
 766                                 "GIT_AUTHOR_EMAIL=$author_email",
 767                                 "GIT_AUTHOR_DATE=".strftime("+0000 %Y-%m-%d %H:%M:%S",gmtime($date)),
 768                                 "GIT_COMMITTER_NAME=$author_name",
 769                                 "GIT_COMMITTER_EMAIL=$author_email",
 770                                 "GIT_COMMITTER_DATE=".strftime("+0000 %Y-%m-%d %H:%M:%S",gmtime($date)),
 771                                 "git-commit-tree", $tree,@par);
 772                         die "Cannot exec git-commit-tree: $!\n";
 773                 }
 774                 $pw->writer();
 775                 $pr->reader();
 776
 777                 $message =~ s/[\s\n]+\z//;
 778                 $message = "r$revision: $message" if $opt_r;
 779
 780                 print $pw "$message\n"
 781                         or die "Error writing to git-commit-tree: $!\n";
 782                 $pw->close();
 783
 784                 print "Committed change $revision:$branch ".strftime("%Y-%m-%d %H:%M:%S",gmtime($date)).")\n" if $opt_v;
 785                 chomp($cid = <$pr>);
 786                 length($cid) == 40
 787                         or die "Cannot get commit id ($cid): $!\n";
 788                 print "Commit ID $cid\n" if $opt_v;
 789                 $pr->close();
 790
 791                 waitpid($pid,0);
 792                 die "Error running git-commit-tree: $?\n" if $?;
 793         }
 794
 795         if (not defined $cid) {
 796                 $cid = $branches{"/"}{"LAST"};
 797         }
 798
 799         if(not defined $dest) {
 800                 print "... no known parent\n" if $opt_v;
 801         } elsif(not $tag) {
 802                 print "Writing to refs/heads/$dest\n" if $opt_v;
 803                 open(C,">$git_dir/refs/heads/$dest") and
 804                 print C ("$cid\n") and
 805                 close(C)
 806                         or die "Cannot write branch $dest for update: $!\n";
 807         }
 808
 809         if($tag) {
 810                 my($in, $out) = ('','');
 811                 $last_rev = "-" if %$changed_paths;
 812                 # the tag was 'complex', i.e. did not refer to a "real" revision
 813
 814                 $dest =~ tr/_/\./ if $opt_u;
 815                 $branch = $dest;
 816
 817                 my $pid = open2($in, $out, 'git-mktag');
 818                 print $out ("object $cid\n".
 819                     "type commit\n".
 820                     "tag $dest\n".
 821                     "tagger $author_name <$author_email>\n") and
 822                 close($out)
 823                     or die "Cannot create tag object $dest: $!\n";
 824
 825                 my $tagobj = <$in>;
 826                 chomp $tagobj;
 827
 828                 if ( !close($in) or waitpid($pid, 0) != $pid or
 829                                 $? != 0 or $tagobj !~ /^[0123456789abcdef]{40}$/ ) {
 830                         die "Cannot create tag object $dest: $!\n";
 831                 }
 832
 833                 open(C,">$git_dir/refs/tags/$dest") and
 834                 print C ("$tagobj\n") and
 835                 close(C)
 836                         or die "Cannot create tag $branch: $!\n";
 837
 838                 print "Created tag '$dest' on '$branch'\n" if $opt_v;
 839         }
 840         $branches{$branch}{"LAST"} = $cid;
 841         $branches{$branch}{$revision} = $cid;
 842         $last_rev = $cid;
 843         print BRANCHES "$revision $branch $cid\n";
 844         print "DONE: $revision $dest $cid\n" if $opt_v;
 845 }
 846
 847 sub commit_all {
 848         # Recursive use of the SVN connection does not work
 849         local $svn = $svn2;
 850
 851         my ($changed_paths, $revision, $author, $date, $message, $pool) = @_;
 852         my %p;
 853         while(my($path,$action) = each %$changed_paths) {
 854                 $p{$path} = [ $action->action,$action->copyfrom_path, $action->copyfrom_rev, $path ];
 855         }
 856         $changed_paths = \%p;
 857
 858         my %done;
 859         my @col;
 860         my $pref;
 861         my $branch;
 862
 863         while(my($path,$action) = each %$changed_paths) {
 864                 ($branch,$path) = split_path($revision,$path);
 865                 next if not defined $branch;
 866                 $done{$branch}{$path} = $action;
 867         }
 868         while(($branch,$changed_paths) = each %done) {
 869                 commit($branch, $changed_paths, $revision, $author, $date, $message);
 870         }
 871 }
 872
 873 $opt_l = $svn->{'maxrev'} if not defined $opt_l or $opt_l > $svn->{'maxrev'};
 874
 875 if ($opt_l < $current_rev) {
 876     print "Up to date: no new revisions to fetch!\n" if $opt_v;
 877     unlink("$git_dir/SVN2GIT_HEAD");
 878     exit;
 879 }
 880
 881 print "Fetching from $current_rev to $opt_l ...\n" if $opt_v;
 882
 883 my $pool=SVN::Pool->new;
 884 $svn->{'svn'}->get_log("/",$current_rev,$opt_l,0,1,1,\&commit_all,$pool);
 885 $pool->clear;
 886
 887
 888 unlink($git_index);
 889
 890 if (defined $orig_git_index) {
 891         $ENV{GIT_INDEX_FILE} = $orig_git_index;
 892 } else {
 893         delete $ENV{GIT_INDEX_FILE};
 894 }
 895
 896 # Now switch back to the branch we were in before all of this happened
 897 if($orig_branch) {
 898         print "DONE\n" if $opt_v and (not defined $opt_l or $opt_l > 0);
 899         system("cp","$git_dir/refs/heads/$opt_o","$git_dir/refs/heads/master")
 900                 if $forward_master;
 901         unless ($opt_i) {
 902                 system('git-read-tree', '-m', '-u', 'SVN2GIT_HEAD', 'HEAD');
 903                 die "read-tree failed: $?\n" if $?;
 904         }
 905 } else {
 906         $orig_branch = "master";
 907         print "DONE; creating $orig_branch branch\n" if $opt_v and (not defined $opt_l or $opt_l > 0);
 908         system("cp","$git_dir/refs/heads/$opt_o","$git_dir/refs/heads/master")
 909                 unless -f "$git_dir/refs/heads/master";
 910         system('git-update-ref', 'HEAD', "$orig_branch");
 911         unless ($opt_i) {
 912                 system('git checkout');
 913                 die "checkout failed: $?\n" if $?;
 914         }
 915 }
 916 unlink("$git_dir/SVN2GIT_HEAD");
 917 close(BRANCHES);