contrib/examples/git-svnimport.perl

   1 #!/usr/bin/perl
   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,$opt_S,$opt_F,
  35     $opt_P,$opt_R);
  36
  37 sub usage() {
  38         print STDERR <<END;
  39 Usage: ${\basename $0}     # fetch/update GIT from SVN
  40        [-o branch-for-HEAD] [-h] [-v] [-l max_rev] [-R repack_each_revs]
  41        [-C GIT_repository] [-t tagname] [-T trunkname] [-b branchname]
  42        [-d|-D] [-i] [-u] [-r] [-I ignorefilename] [-s start_chg]
  43        [-m] [-M regex] [-A author_file] [-S] [-F] [-P project_name] [SVN_URL]
  44 END
  45         exit(1);
  46 }
  47
  48 getopts("A:b:C:dDFhiI:l:mM:o:rs:t:T:SP:R:uv") or usage();
  49 usage if $opt_h;
  50
  51 my $tag_name = $opt_t || "tags";
  52 my $trunk_name = defined $opt_T ? $opt_T : "trunk";
  53 my $branch_name = $opt_b || "branches";
  54 my $project_name = $opt_P || "";
  55 $project_name = "/" . $project_name if ($project_name);
  56 my $repack_after = $opt_R || 1000;
  57 my $root_pool = SVN::Pool->new_default;
  58
  59 @ARGV == 1 or @ARGV == 2 or usage();
  60
  61 $opt_o ||= "origin";
  62 $opt_s ||= 1;
  63 my $git_tree = $opt_C;
  64 $git_tree ||= ".";
  65
  66 my $svn_url = $ARGV[0];
  67 my $svn_dir = $ARGV[1];
  68
  69 our @mergerx = ();
  70 if ($opt_m) {
  71         my $branch_esc = quotemeta ($branch_name);
  72         my $trunk_esc  = quotemeta ($trunk_name);
  73         @mergerx =
  74         (
  75                 qr!\b(?:merg(?:ed?|ing))\b.*?\b((?:(?<=$branch_esc/)[\w\.\-]+)|(?:$trunk_esc))\b!i,
  76                 qr!\b(?:from|of)\W+((?:(?<=$branch_esc/)[\w\.\-]+)|(?:$trunk_esc))\b!i,
  77                 qr!\b(?:from|of)\W+(?:the )?([\w\.\-]+)[-\s]branch\b!i
  78         );
  79 }
  80 if ($opt_M) {
  81         unshift (@mergerx, qr/$opt_M/);
  82 }
  83
  84 # Absolutize filename now, since we will have chdir'ed by the time we
  85 # get around to opening it.
  86 $opt_A = File::Spec->rel2abs($opt_A) if $opt_A;
  87
  88 our %users = ();
  89 our $users_file = undef;
  90 sub read_users($) {
  91         $users_file = File::Spec->rel2abs(@_);
  92         die "Cannot open $users_file\n" unless -f $users_file;
  93         open(my $authors,$users_file);
  94         while(<$authors>) {
  95                 chomp;
  96                 next unless /^(\S+?)\s*=\s*(.+?)\s*<(.+)>\s*$/;
  97                 (my $user,my $name,my $email) = ($1,$2,$3);
  98                 $users{$user} = [$name,$email];
  99         }
 100         close($authors);
 101 }
 102
 103 select(STDERR); $|=1; select(STDOUT);
 104
 105
 106 package SVNconn;
 107 # Basic SVN connection.
 108 # We're only interested in connecting and downloading, so ...
 109
 110 use File::Spec;
 111 use File::Temp qw(tempfile);
 112 use POSIX qw(strftime dup2);
 113 use Fcntl qw(SEEK_SET);
 114
 115 sub new {
 116         my($what,$repo) = @_;
 117         $what=ref($what) if ref($what);
 118
 119         my $self = {};
 120         $self->{'buffer'} = "";
 121         bless($self,$what);
 122
 123         $repo =~ s#/+$##;
 124         $self->{'fullrep'} = $repo;
 125         $self->conn();
 126
 127         return $self;
 128 }
 129
 130 sub conn {
 131         my $self = shift;
 132         my $repo = $self->{'fullrep'};
 133         my $auth = SVN::Core::auth_open ([SVN::Client::get_simple_provider,
 134                           SVN::Client::get_ssl_server_trust_file_provider,
 135                           SVN::Client::get_username_provider]);
 136         my $s = SVN::Ra->new(url => $repo, auth => $auth, pool => $root_pool);
 137         die "SVN connection to $repo: $!\n" unless defined $s;
 138         $self->{'svn'} = $s;
 139         $self->{'repo'} = $repo;
 140         $self->{'maxrev'} = $s->get_latest_revnum();
 141 }
 142
 143 sub file {
 144         my($self,$path,$rev) = @_;
 145
 146         my ($fh, $name) = tempfile('gitsvn.XXXXXX',
 147                     DIR => File::Spec->tmpdir(), UNLINK => 1);
 148
 149         print "... $rev $path ...\n" if $opt_v;
 150         my (undef, $properties);
 151         $path =~ s#^/*##;
 152         my $subpool = SVN::Pool::new_default_sub;
 153         eval { (undef, $properties)
 154                    = $self->{'svn'}->get_file($path,$rev,$fh); };
 155         if($@) {
 156                 return undef if $@ =~ /Attempted to get checksum/;
 157                 die $@;
 158         }
 159         my $mode;
 160         if (exists $properties->{'svn:executable'}) {
 161                 $mode = '100755';
 162         } elsif (exists $properties->{'svn:special'}) {
 163                 my ($special_content, $filesize);
 164                 $filesize = tell $fh;
 165                 seek $fh, 0, SEEK_SET;
 166                 read $fh, $special_content, $filesize;
 167                 if ($special_content =~ s/^link //) {
 168                         $mode = '120000';
 169                         seek $fh, 0, SEEK_SET;
 170                         truncate $fh, 0;
 171                         print $fh $special_content;
 172                 } else {
 173                         die "unexpected svn:special file encountered";
 174                 }
 175         } else {
 176                 $mode = '100644';
 177         }
 178         close ($fh);
 179
 180         return ($name, $mode);
 181 }
 182
 183 sub ignore {
 184         my($self,$path,$rev) = @_;
 185
 186         print "... $rev $path ...\n" if $opt_v;
 187         $path =~ s#^/*##;
 188         my $subpool = SVN::Pool::new_default_sub;
 189         my (undef,undef,$properties)
 190             = $self->{'svn'}->get_dir($path,$rev,undef);
 191         if (exists $properties->{'svn:ignore'}) {
 192                 my ($fh, $name) = tempfile('gitsvn.XXXXXX',
 193                                            DIR => File::Spec->tmpdir(),
 194                                            UNLINK => 1);
 195                 print $fh $properties->{'svn:ignore'};
 196                 close($fh);
 197                 return $name;
 198         } else {
 199                 return undef;
 200         }
 201 }
 202
 203 sub dir_list {
 204         my($self,$path,$rev) = @_;
 205         $path =~ s#^/*##;
 206         my $subpool = SVN::Pool::new_default_sub;
 207         my ($dirents,undef,$properties)
 208             = $self->{'svn'}->get_dir($path,$rev,undef);
 209         return $dirents;
 210 }
 211
 212 package main;
 213 use URI;
 214
 215 our $svn = $svn_url;
 216 $svn .= "/$svn_dir" if defined $svn_dir;
 217 my $svn2 = SVNconn->new($svn);
 218 $svn = SVNconn->new($svn);
 219
 220 my $lwp_ua;
 221 if($opt_d or $opt_D) {
 222         $svn_url = URI->new($svn_url)->canonical;
 223         if($opt_D) {
 224                 $svn_dir =~ s#/*$#/#;
 225         } else {
 226                 $svn_dir = "";
 227         }
 228         if ($svn_url->scheme eq "http") {
 229                 use LWP::UserAgent;
 230                 $lwp_ua = LWP::UserAgent->new(keep_alive => 1, requests_redirectable => []);
 231         } else {
 232                 print STDERR "Warning: not HTTP; turning off direct file access\n";
 233                 $opt_d=0;
 234         }
 235 }
 236
 237 sub pdate($) {
 238         my($d) = @_;
 239         $d =~ m#(\d\d\d\d)-(\d\d)-(\d\d)T(\d\d):(\d\d):(\d\d)#
 240                 or die "Unparseable date: $d\n";
 241         my $y=$1; $y-=1900 if $y>1900;
 242         return timegm($6||0,$5,$4,$3,$2-1,$y);
 243 }
 244
 245 sub getwd() {
 246         my $pwd = `pwd`;
 247         chomp $pwd;
 248         return $pwd;
 249 }
 250
 251
 252 sub get_headref($$) {
 253     my $name    = shift;
 254     my $git_dir = shift;
 255     my $sha;
 256
 257     if (open(C,"$git_dir/refs/heads/$name")) {
 258         chomp($sha = <C>);
 259         close(C);
 260         length($sha) == 40
 261             or die "Cannot get head id for $name ($sha): $!\n";
 262     }
 263     return $sha;
 264 }
 265
 266
 267 -d $git_tree
 268         or mkdir($git_tree,0777)
 269         or die "Could not create $git_tree: $!";
 270 chdir($git_tree);
 271
 272 my $orig_branch = "";
 273 my $forward_master = 0;
 274 my %branches;
 275
 276 my $git_dir = $ENV{"GIT_DIR"} || ".git";
 277 $git_dir = getwd()."/".$git_dir unless $git_dir =~ m#^/#;
 278 $ENV{"GIT_DIR"} = $git_dir;
 279 my $orig_git_index;
 280 $orig_git_index = $ENV{GIT_INDEX_FILE} if exists $ENV{GIT_INDEX_FILE};
 281 my ($git_ih, $git_index) = tempfile('gitXXXXXX', SUFFIX => '.idx',
 282                                     DIR => File::Spec->tmpdir());
 283 close ($git_ih);
 284 $ENV{GIT_INDEX_FILE} = $git_index;
 285 my $maxnum = 0;
 286 my $last_rev = "";
 287 my $last_branch;
 288 my $current_rev = $opt_s || 1;
 289 unless(-d $git_dir) {
 290         system("git init");
 291         die "Cannot init the GIT db at $git_tree: $?\n" if $?;
 292         system("git read-tree");
 293         die "Cannot init an empty tree: $?\n" if $?;
 294
 295         $last_branch = $opt_o;
 296         $orig_branch = "";
 297 } else {
 298         -f "$git_dir/refs/heads/$opt_o"
 299                 or die "Branch '$opt_o' does not exist.\n".
 300                        "Either use the correct '-o branch' option,\n".
 301                        "or import to a new repository.\n";
 302
 303         -f "$git_dir/svn2git"
 304                 or die "'$git_dir/svn2git' does not exist.\n".
 305                        "You need that file for incremental imports.\n";
 306         open(F, "git symbolic-ref HEAD |") or
 307                 die "Cannot run git-symbolic-ref: $!\n";
 308         chomp ($last_branch = <F>);
 309         $last_branch = basename($last_branch);
 310         close(F);
 311         unless($last_branch) {
 312                 warn "Cannot read the last branch name: $! -- assuming 'master'\n";
 313                 $last_branch = "master";
 314         }
 315         $orig_branch = $last_branch;
 316         $last_rev = get_headref($orig_branch, $git_dir);
 317         if (-f "$git_dir/SVN2GIT_HEAD") {
 318                 die <<EOM;
 319 SVN2GIT_HEAD exists.
 320 Make sure your working directory corresponds to HEAD and remove SVN2GIT_HEAD.
 321 You may need to run
 322
 323     git-read-tree -m -u SVN2GIT_HEAD HEAD
 324 EOM
 325         }
 326         system('cp', "$git_dir/HEAD", "$git_dir/SVN2GIT_HEAD");
 327
 328         $forward_master =
 329             $opt_o ne 'master' && -f "$git_dir/refs/heads/master" &&
 330             system('cmp', '-s', "$git_dir/refs/heads/master",
 331                                 "$git_dir/refs/heads/$opt_o") == 0;
 332
 333         # populate index
 334         system('git', 'read-tree', $last_rev);
 335         die "read-tree failed: $?\n" if $?;
 336
 337         # Get the last import timestamps
 338         open my $B,"<", "$git_dir/svn2git";
 339         while(<$B>) {
 340                 chomp;
 341                 my($num,$branch,$ref) = split;
 342                 $branches{$branch}{$num} = $ref;
 343                 $branches{$branch}{"LAST"} = $ref;
 344                 $current_rev = $num+1 if $current_rev <= $num;
 345         }
 346         close($B);
 347 }
 348 -d $git_dir
 349         or die "Could not create git subdir ($git_dir).\n";
 350
 351 my $default_authors = "$git_dir/svn-authors";
 352 if ($opt_A) {
 353         read_users($opt_A);
 354         copy($opt_A,$default_authors) or die "Copy failed: $!";
 355 } else {
 356         read_users($default_authors) if -f $default_authors;
 357 }
 358
 359 open BRANCHES,">>", "$git_dir/svn2git";
 360
 361 sub node_kind($$) {
 362         my ($svnpath, $revision) = @_;
 363         $svnpath =~ s#^/*##;
 364         my $subpool = SVN::Pool::new_default_sub;
 365         my $kind = $svn->{'svn'}->check_path($svnpath,$revision);
 366         return $kind;
 367 }
 368
 369 sub get_file($$$) {
 370         my($svnpath,$rev,$path) = @_;
 371
 372         # now get it
 373         my ($name,$mode);
 374         if($opt_d) {
 375                 my($req,$res);
 376
 377                 # /svn/!svn/bc/2/django/trunk/django-docs/build.py
 378                 my $url=$svn_url->clone();
 379                 $url->path($url->path."/!svn/bc/$rev/$svn_dir$svnpath");
 380                 print "... $path...\n" if $opt_v;
 381                 $req = HTTP::Request->new(GET => $url);
 382                 $res = $lwp_ua->request($req);
 383                 if ($res->is_success) {
 384                         my $fh;
 385                         ($fh, $name) = tempfile('gitsvn.XXXXXX',
 386                         DIR => File::Spec->tmpdir(), UNLINK => 1);
 387                         print $fh $res->content;
 388                         close($fh) or die "Could not write $name: $!\n";
 389                 } else {
 390                         return undef if $res->code == 301; # directory?
 391                         die $res->status_line." at $url\n";
 392                 }
 393                 $mode = '0644'; # can't obtain mode via direct http request?
 394         } else {
 395                 ($name,$mode) = $svn->file("$svnpath",$rev);
 396                 return undef unless defined $name;
 397         }
 398
 399         my $pid = open(my $F, '-|');
 400         die $! unless defined $pid;
 401         if (!$pid) {
 402             exec("git", "hash-object", "-w", $name)
 403                 or die "Cannot create object: $!\n";
 404         }
 405         my $sha = <$F>;
 406         chomp $sha;
 407         close $F;
 408         unlink $name;
 409         return [$mode, $sha, $path];
 410 }
 411
 412 sub get_ignore($$$$$) {
 413         my($new,$old,$rev,$path,$svnpath) = @_;
 414
 415         return unless $opt_I;
 416         my $name = $svn->ignore("$svnpath",$rev);
 417         if ($path eq '/') {
 418                 $path = $opt_I;
 419         } else {
 420                 $path = File::Spec->catfile($path,$opt_I);
 421         }
 422         if (defined $name) {
 423                 my $pid = open(my $F, '-|');
 424                 die $! unless defined $pid;
 425                 if (!$pid) {
 426                         exec("git", "hash-object", "-w", $name)
 427                             or die "Cannot create object: $!\n";
 428                 }
 429                 my $sha = <$F>;
 430                 chomp $sha;
 431                 close $F;
 432                 unlink $name;
 433                 push(@$new,['0644',$sha,$path]);
 434         } elsif (defined $old) {
 435                 push(@$old,$path);
 436         }
 437 }
 438
 439 sub project_path($$)
 440 {
 441         my ($path, $project) = @_;
 442
 443         $path = "/".$path unless ($path =~ m#^\/#) ;
 444         return $1 if ($path =~ m#^$project\/(.*)$#);
 445
 446         $path =~ s#\.#\\\.#g;
 447         $path =~ s#\+#\\\+#g;
 448         return "/" if ($project =~ m#^$path.*$#);
 449
 450         return undef;
 451 }
 452
 453 sub split_path($$) {
 454         my($rev,$path) = @_;
 455         my $branch;
 456
 457         if($path =~ s#^/\Q$tag_name\E/([^/]+)/?##) {
 458                 $branch = "/$1";
 459         } elsif($path =~ s#^/\Q$trunk_name\E/?##) {
 460                 $branch = "/";
 461         } elsif($path =~ s#^/\Q$branch_name\E/([^/]+)/?##) {
 462                 $branch = $1;
 463         } else {
 464                 my %no_error = (
 465                         "/" => 1,
 466                         "/$tag_name" => 1,
 467                         "/$branch_name" => 1
 468                 );
 469                 print STDERR "$rev: Unrecognized path: $path\n" unless (defined $no_error{$path});
 470                 return ()
 471         }
 472         if ($path eq "") {
 473                 $path = "/";
 474         } elsif ($project_name) {
 475                 $path = project_path($path, $project_name);
 476         }
 477         return ($branch,$path);
 478 }
 479
 480 sub branch_rev($$) {
 481
 482         my ($srcbranch,$uptorev) = @_;
 483
 484         my $bbranches = $branches{$srcbranch};
 485         my @revs = reverse sort { ($a eq 'LAST' ? 0 : $a) <=> ($b eq 'LAST' ? 0 : $b) } keys %$bbranches;
 486         my $therev;
 487         foreach my $arev(@revs) {
 488                 next if  ($arev eq 'LAST');
 489                 if ($arev <= $uptorev) {
 490                         $therev = $arev;
 491                         last;
 492                 }
 493         }
 494         return $therev;
 495 }
 496
 497 sub expand_svndir($$$);
 498
 499 sub expand_svndir($$$)
 500 {
 501         my ($svnpath, $rev, $path) = @_;
 502         my @list;
 503         get_ignore(\@list, undef, $rev, $path, $svnpath);
 504         my $dirents = $svn->dir_list($svnpath, $rev);
 505         foreach my $p(keys %$dirents) {
 506                 my $kind = node_kind($svnpath.'/'.$p, $rev);
 507                 if ($kind eq $SVN::Node::file) {
 508                         my $f = get_file($svnpath.'/'.$p, $rev, $path.'/'.$p);
 509                         push(@list, $f) if $f;
 510                 } elsif ($kind eq $SVN::Node::dir) {
 511                         push(@list,
 512                              expand_svndir($svnpath.'/'.$p, $rev, $path.'/'.$p));
 513                 }
 514         }
 515         return @list;
 516 }
 517
 518 sub copy_path($$$$$$$$) {
 519         # Somebody copied a whole subdirectory.
 520         # We need to find the index entries from the old version which the
 521         # SVN log entry points to, and add them to the new place.
 522
 523         my($newrev,$newbranch,$path,$oldpath,$rev,$node_kind,$new,$parents) = @_;
 524
 525         my($srcbranch,$srcpath) = split_path($rev,$oldpath);
 526         unless(defined $srcbranch && defined $srcpath) {
 527                 print "Path not found when copying from $oldpath @ $rev.\n".
 528                         "Will try to copy from original SVN location...\n"
 529                         if $opt_v;
 530                 push (@$new, expand_svndir($oldpath, $rev, $path));
 531                 return;
 532         }
 533         my $therev = branch_rev($srcbranch, $rev);
 534         my $gitrev = $branches{$srcbranch}{$therev};
 535         unless($gitrev) {
 536                 print STDERR "$newrev:$newbranch: could not find $oldpath \@ $rev\n";
 537                 return;
 538         }
 539         if ($srcbranch ne $newbranch) {
 540                 push(@$parents, $branches{$srcbranch}{'LAST'});
 541         }
 542         print "$newrev:$newbranch:$path: copying from $srcbranch:$srcpath @ $rev\n" if $opt_v;
 543         if ($node_kind eq $SVN::Node::dir) {
 544                 $srcpath =~ s#/*$#/#;
 545         }
 546
 547         my $pid = open my $f,'-|';
 548         die $! unless defined $pid;
 549         if (!$pid) {
 550                 exec("git","ls-tree","-r","-z",$gitrev,$srcpath)
 551                         or die $!;
 552         }
 553         local $/ = "\0";
 554         while(<$f>) {
 555                 chomp;
 556                 my($m,$p) = split(/\t/,$_,2);
 557                 my($mode,$type,$sha1) = split(/ /,$m);
 558                 next if $type ne "blob";
 559                 if ($node_kind eq $SVN::Node::dir) {
 560                         $p = $path . substr($p,length($srcpath)-1);
 561                 } else {
 562                         $p = $path;
 563                 }
 564                 push(@$new,[$mode,$sha1,$p]);
 565         }
 566         close($f) or
 567                 print STDERR "$newrev:$newbranch: could not list files in $oldpath \@ $rev\n";
 568 }
 569
 570 sub commit {
 571         my($branch, $changed_paths, $revision, $author, $date, $message) = @_;
 572         my($committer_name,$committer_email,$dest);
 573         my($author_name,$author_email);
 574         my(@old,@new,@parents);
 575
 576         if (not defined $author or $author eq "") {
 577                 $committer_name = $committer_email = "unknown";
 578         } elsif (defined $users_file) {
 579                 die "User $author is not listed in $users_file\n"
 580                     unless exists $users{$author};
 581                 ($committer_name,$committer_email) = @{$users{$author}};
 582         } elsif ($author =~ /^(.*?)\s+<(.*)>$/) {
 583                 ($committer_name, $committer_email) = ($1, $2);
 584         } else {
 585                 $author =~ s/^<(.*)>$/$1/;
 586                 $committer_name = $committer_email = $author;
 587         }
 588
 589         if ($opt_F && $message =~ /From:\s+(.*?)\s+<(.*)>\s*\n/) {
 590                 ($author_name, $author_email) = ($1, $2);
 591                 print "Author from From: $1 <$2>\n" if ($opt_v);;
 592         } elsif ($opt_S && $message =~ /Signed-off-by:\s+(.*?)\s+<(.*)>\s*\n/) {
 593                 ($author_name, $author_email) = ($1, $2);
 594                 print "Author from Signed-off-by: $1 <$2>\n" if ($opt_v);;
 595         } else {
 596                 $author_name = $committer_name;
 597                 $author_email = $committer_email;
 598         }
 599
 600         $date = pdate($date);
 601
 602         my $tag;
 603         my $parent;
 604         if($branch eq "/") { # trunk
 605                 $parent = $opt_o;
 606         } elsif($branch =~ m#^/(.+)#) { # tag
 607                 $tag = 1;
 608                 $parent = $1;
 609         } else { # "normal" branch
 610                 # nothing to do
 611                 $parent = $branch;
 612         }
 613         $dest = $parent;
 614
 615         my $prev = $changed_paths->{"/"};
 616         if($prev and $prev->[0] eq "A") {
 617                 delete $changed_paths->{"/"};
 618                 my $oldpath = $prev->[1];
 619                 my $rev;
 620                 if(defined $oldpath) {
 621                         my $p;
 622                         ($parent,$p) = split_path($revision,$oldpath);
 623                         if(defined $parent) {
 624                                 if($parent eq "/") {
 625                                         $parent = $opt_o;
 626                                 } else {
 627                                         $parent =~ s#^/##; # if it's a tag
 628                                 }
 629                         }
 630                 } else {
 631                         $parent = undef;
 632                 }
 633         }
 634
 635         my $rev;
 636         if($revision > $opt_s and defined $parent) {
 637                 open(H,'-|',"git","rev-parse","--verify",$parent);
 638                 $rev = <H>;
 639                 close(H) or do {
 640                         print STDERR "$revision: cannot find commit '$parent'!\n";
 641                         return;
 642                 };
 643                 chop $rev;
 644                 if(length($rev) != 40) {
 645                         print STDERR "$revision: cannot find commit '$parent'!\n";
 646                         return;
 647                 }
 648                 $rev = $branches{($parent eq $opt_o) ? "/" : $parent}{"LAST"};
 649                 if($revision != $opt_s and not $rev) {
 650                         print STDERR "$revision: do not know ancestor for '$parent'!\n";
 651                         return;
 652                 }
 653         } else {
 654                 $rev = undef;
 655         }
 656
 657 #       if($prev and $prev->[0] eq "A") {
 658 #               if(not $tag) {
 659 #                       unless(open(H,"> $git_dir/refs/heads/$branch")) {
 660 #                               print STDERR "$revision: Could not create branch $branch: $!\n";
 661 #                               $state=11;
 662 #                               next;
 663 #                       }
 664 #                       print H "$rev\n"
 665 #                               or die "Could not write branch $branch: $!";
 666 #                       close(H)
 667 #                               or die "Could not write branch $branch: $!";
 668 #               }
 669 #       }
 670         if(not defined $rev) {
 671                 unlink($git_index);
 672         } elsif ($rev ne $last_rev) {
 673                 print "Switching from $last_rev to $rev ($branch)\n" if $opt_v;
 674                 system("git", "read-tree", $rev);
 675                 die "read-tree failed for $rev: $?\n" if $?;
 676                 $last_rev = $rev;
 677         }
 678
 679         push (@parents, $rev) if defined $rev;
 680
 681         my $cid;
 682         if($tag and not %$changed_paths) {
 683                 $cid = $rev;
 684         } else {
 685                 my @paths = sort keys %$changed_paths;
 686                 foreach my $path(@paths) {
 687                         my $action = $changed_paths->{$path};
 688
 689                         if ($action->[0] eq "R") {
 690                                 # refer to a file/tree in an earlier commit
 691                                 push(@old,$path); # remove any old stuff
 692                         }
 693                         if(($action->[0] eq "A") || ($action->[0] eq "R")) {
 694                                 my $node_kind = node_kind($action->[3], $revision);
 695                                 if ($node_kind eq $SVN::Node::file) {
 696                                         my $f = get_file($action->[3],
 697                                                          $revision, $path);
 698                                         if ($f) {
 699                                                 push(@new,$f) if $f;
 700                                         } else {
 701                                                 my $opath = $action->[3];
 702                                                 print STDERR "$revision: $branch: could not fetch '$opath'\n";
 703                                         }
 704                                 } elsif ($node_kind eq $SVN::Node::dir) {
 705                                         if($action->[1]) {
 706                                                 copy_path($revision, $branch,
 707                                                           $path, $action->[1],
 708                                                           $action->[2], $node_kind,
 709                                                           \@new, \@parents);
 710                                         } else {
 711                                                 get_ignore(\@new, \@old, $revision,
 712                                                            $path, $action->[3]);
 713                                         }
 714                                 }
 715                         } elsif ($action->[0] eq "D") {
 716                                 push(@old,$path);
 717                         } elsif ($action->[0] eq "M") {
 718                                 my $node_kind = node_kind($action->[3], $revision);
 719                                 if ($node_kind eq $SVN::Node::file) {
 720                                         my $f = get_file($action->[3],
 721                                                          $revision, $path);
 722                                         push(@new,$f) if $f;
 723                                 } elsif ($node_kind eq $SVN::Node::dir) {
 724                                         get_ignore(\@new, \@old, $revision,
 725                                                    $path, $action->[3]);
 726                                 }
 727                         } else {
 728                                 die "$revision: unknown action '".$action->[0]."' for $path\n";
 729                         }
 730                 }
 731
 732                 while(@old) {
 733                         my @o1;
 734                         if(@old > 55) {
 735                                 @o1 = splice(@old,0,50);
 736                         } else {
 737                                 @o1 = @old;
 738                                 @old = ();
 739                         }
 740                         my $pid = open my $F, "-|";
 741                         die "$!" unless defined $pid;
 742                         if (!$pid) {
 743                                 exec("git", "ls-files", "-z", @o1) or die $!;
 744                         }
 745                         @o1 = ();
 746                         local $/ = "\0";
 747                         while(<$F>) {
 748                                 chomp;
 749                                 push(@o1,$_);
 750                         }
 751                         close($F);
 752
 753                         while(@o1) {
 754                                 my @o2;
 755                                 if(@o1 > 55) {
 756                                         @o2 = splice(@o1,0,50);
 757                                 } else {
 758                                         @o2 = @o1;
 759                                         @o1 = ();
 760                                 }
 761                                 system("git","update-index","--force-remove","--",@o2);
 762                                 die "Cannot remove files: $?\n" if $?;
 763                         }
 764                 }
 765                 while(@new) {
 766                         my @n2;
 767                         if(@new > 12) {
 768                                 @n2 = splice(@new,0,10);
 769                         } else {
 770                                 @n2 = @new;
 771                                 @new = ();
 772                         }
 773                         system("git","update-index","--add",
 774                                 (map { ('--cacheinfo', @$_) } @n2));
 775                         die "Cannot add files: $?\n" if $?;
 776                 }
 777
 778                 my $pid = open(C,"-|");
 779                 die "Cannot fork: $!" unless defined $pid;
 780                 unless($pid) {
 781                         exec("git","write-tree");
 782                         die "Cannot exec git-write-tree: $!\n";
 783                 }
 784                 chomp(my $tree = <C>);
 785                 length($tree) == 40
 786                         or die "Cannot get tree id ($tree): $!\n";
 787                 close(C)
 788                         or die "Error running git-write-tree: $?\n";
 789                 print "Tree ID $tree\n" if $opt_v;
 790
 791                 my $pr = IO::Pipe->new() or die "Cannot open pipe: $!\n";
 792                 my $pw = IO::Pipe->new() or die "Cannot open pipe: $!\n";
 793                 $pid = fork();
 794                 die "Fork: $!\n" unless defined $pid;
 795                 unless($pid) {
 796                         $pr->writer();
 797                         $pw->reader();
 798                         open(OUT,">&STDOUT");
 799                         dup2($pw->fileno(),0);
 800                         dup2($pr->fileno(),1);
 801                         $pr->close();
 802                         $pw->close();
 803
 804                         my @par = ();
 805
 806                         # loose detection of merges
 807                         # based on the commit msg
 808                         foreach my $rx (@mergerx) {
 809                                 if ($message =~ $rx) {
 810                                         my $mparent = $1;
 811                                         if ($mparent eq 'HEAD') { $mparent = $opt_o };
 812                                         if ( -e "$git_dir/refs/heads/$mparent") {
 813                                                 $mparent = get_headref($mparent, $git_dir);
 814                                                 push (@parents, $mparent);
 815                                                 print OUT "Merge parent branch: $mparent\n" if $opt_v;
 816                                         }
 817                                 }
 818                         }
 819                         my %seen_parents = ();
 820                         my @unique_parents = grep { ! $seen_parents{$_} ++ } @parents;
 821                         foreach my $bparent (@unique_parents) {
 822                                 push @par, '-p', $bparent;
 823                                 print OUT "Merge parent branch: $bparent\n" if $opt_v;
 824                         }
 825
 826                         exec("env",
 827                                 "GIT_AUTHOR_NAME=$author_name",
 828                                 "GIT_AUTHOR_EMAIL=$author_email",
 829                                 "GIT_AUTHOR_DATE=".strftime("+0000 %Y-%m-%d %H:%M:%S",gmtime($date)),
 830                                 "GIT_COMMITTER_NAME=$committer_name",
 831                                 "GIT_COMMITTER_EMAIL=$committer_email",
 832                                 "GIT_COMMITTER_DATE=".strftime("+0000 %Y-%m-%d %H:%M:%S",gmtime($date)),
 833                                 "git", "commit-tree", $tree,@par);
 834                         die "Cannot exec git-commit-tree: $!\n";
 835                 }
 836                 $pw->writer();
 837                 $pr->reader();
 838
 839                 $message =~ s/[\s\n]+\z//;
 840                 $message = "r$revision: $message" if $opt_r;
 841
 842                 print $pw "$message\n"
 843                         or die "Error writing to git-commit-tree: $!\n";
 844                 $pw->close();
 845
 846                 print "Committed change $revision:$branch ".strftime("%Y-%m-%d %H:%M:%S",gmtime($date)).")\n" if $opt_v;
 847                 chomp($cid = <$pr>);
 848                 length($cid) == 40
 849                         or die "Cannot get commit id ($cid): $!\n";
 850                 print "Commit ID $cid\n" if $opt_v;
 851                 $pr->close();
 852
 853                 waitpid($pid,0);
 854                 die "Error running git-commit-tree: $?\n" if $?;
 855         }
 856
 857         if (not defined $cid) {
 858                 $cid = $branches{"/"}{"LAST"};
 859         }
 860
 861         if(not defined $dest) {
 862                 print "... no known parent\n" if $opt_v;
 863         } elsif(not $tag) {
 864                 print "Writing to refs/heads/$dest\n" if $opt_v;
 865                 open(C,">$git_dir/refs/heads/$dest") and
 866                 print C ("$cid\n") and
 867                 close(C)
 868                         or die "Cannot write branch $dest for update: $!\n";
 869         }
 870
 871         if ($tag) {
 872                 $last_rev = "-" if %$changed_paths;
 873                 # the tag was 'complex', i.e. did not refer to a "real" revision
 874
 875                 $dest =~ tr/_/\./ if $opt_u;
 876
 877                 system('git', 'tag', '-f', $dest, $cid) == 0
 878                         or die "Cannot create tag $dest: $!\n";
 879
 880                 print "Created tag '$dest' on '$branch'\n" if $opt_v;
 881         }
 882         $branches{$branch}{"LAST"} = $cid;
 883         $branches{$branch}{$revision} = $cid;
 884         $last_rev = $cid;
 885         print BRANCHES "$revision $branch $cid\n";
 886         print "DONE: $revision $dest $cid\n" if $opt_v;
 887 }
 888
 889 sub commit_all {
 890         # Recursive use of the SVN connection does not work
 891         local $svn = $svn2;
 892
 893         my ($changed_paths, $revision, $author, $date, $message) = @_;
 894         my %p;
 895         while(my($path,$action) = each %$changed_paths) {
 896                 $p{$path} = [ $action->action,$action->copyfrom_path, $action->copyfrom_rev, $path ];
 897         }
 898         $changed_paths = \%p;
 899
 900         my %done;
 901         my @col;
 902         my $pref;
 903         my $branch;
 904
 905         while(my($path,$action) = each %$changed_paths) {
 906                 ($branch,$path) = split_path($revision,$path);
 907                 next if not defined $branch;
 908                 next if not defined $path;
 909                 $done{$branch}{$path} = $action;
 910         }
 911         while(($branch,$changed_paths) = each %done) {
 912                 commit($branch, $changed_paths, $revision, $author, $date, $message);
 913         }
 914 }
 915
 916 $opt_l = $svn->{'maxrev'} if not defined $opt_l or $opt_l > $svn->{'maxrev'};
 917
 918 if ($opt_l < $current_rev) {
 919     print "Up to date: no new revisions to fetch!\n" if $opt_v;
 920     unlink("$git_dir/SVN2GIT_HEAD");
 921     exit;
 922 }
 923
 924 print "Processing from $current_rev to $opt_l ...\n" if $opt_v;
 925
 926 my $from_rev;
 927 my $to_rev = $current_rev - 1;
 928
 929 my $subpool = SVN::Pool::new_default_sub;
 930 while ($to_rev < $opt_l) {
 931         $subpool->clear;
 932         $from_rev = $to_rev + 1;
 933         $to_rev = $from_rev + $repack_after;
 934         $to_rev = $opt_l if $opt_l < $to_rev;
 935         print "Fetching from $from_rev to $to_rev ...\n" if $opt_v;
 936         $svn->{'svn'}->get_log("",$from_rev,$to_rev,0,1,1,\&commit_all);
 937         my $pid = fork();
 938         die "Fork: $!\n" unless defined $pid;
 939         unless($pid) {
 940                 exec("git", "repack", "-d")
 941                         or die "Cannot repack: $!\n";
 942         }
 943         waitpid($pid, 0);
 944 }
 945
 946
 947 unlink($git_index);
 948
 949 if (defined $orig_git_index) {
 950         $ENV{GIT_INDEX_FILE} = $orig_git_index;
 951 } else {
 952         delete $ENV{GIT_INDEX_FILE};
 953 }
 954
 955 # Now switch back to the branch we were in before all of this happened
 956 if($orig_branch) {
 957         print "DONE\n" if $opt_v and (not defined $opt_l or $opt_l > 0);
 958         system("cp","$git_dir/refs/heads/$opt_o","$git_dir/refs/heads/master")
 959                 if $forward_master;
 960         unless ($opt_i) {
 961                 system('git', 'read-tree', '-m', '-u', 'SVN2GIT_HEAD', 'HEAD');
 962                 die "read-tree failed: $?\n" if $?;
 963         }
 964 } else {
 965         $orig_branch = "master";
 966         print "DONE; creating $orig_branch branch\n" if $opt_v and (not defined $opt_l or $opt_l > 0);
 967         system("cp","$git_dir/refs/heads/$opt_o","$git_dir/refs/heads/master")
 968                 unless -f "$git_dir/refs/heads/master";
 969         system('git', 'update-ref', 'HEAD', "$orig_branch");
 970         unless ($opt_i) {
 971                 system('git checkout');
 972                 die "checkout failed: $?\n" if $?;
 973         }
 974 }
 975 unlink("$git_dir/SVN2GIT_HEAD");
 976 close(BRANCHES);