Andrew's git / gitweb.git / git-cvsimport-script
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git-cvsimport-scripton commit Make "upload-pack" match git-fetch-pack usage (113b947)
   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 aggregate CVS check-ins into related changes.
   7# Fortunately, "cvsps" does that for us; all we have to do is to parse
   8# its output.
   9#
  10# Checking out the files is done by a single long-running CVS connection
  11# / server process.
  12#
  13# The head revision is on branch "origin" by default.
  14# You can change that with the '-o' option.
  15
  16use strict;
  17use warnings;
  18use Getopt::Std;
  19use File::Spec;
  20use File::Temp qw(tempfile);
  21use File::Path qw(mkpath);
  22use File::Basename qw(basename dirname);
  23use Time::Local;
  24use IO::Socket;
  25use IO::Pipe;
  26use POSIX qw(strftime dup2);
  27
  28$SIG{'PIPE'}="IGNORE";
  29$ENV{'TZ'}="UTC";
  30
  31our($opt_h,$opt_o,$opt_v,$opt_d,$opt_p,$opt_C,$opt_z);
  32
  33sub usage() {
  34        print STDERR <<END;
  35Usage: ${\basename $0}     # fetch/update GIT from CVS
  36       [ -o branch-for-HEAD ] [ -h ] [ -v ] [ -d CVSROOT ]
  37       [ -p opts-for-cvsps ] [ -C GIT_repository ] [ -z fuzz ]
  38       [ CVS_module ]
  39END
  40        exit(1);
  41}
  42
  43getopts("hvo:d:p:C:z:") or usage();
  44usage if $opt_h;
  45
  46@ARGV <= 1 or usage();
  47
  48if($opt_d) {
  49        $ENV{"CVSROOT"} = $opt_d;
  50} elsif(-f 'CVS/Root') {
  51        open my $f, '<', 'CVS/Root' or die 'Failed to open CVS/Root';
  52        $opt_d = <$f>;
  53        chomp $opt_d;
  54        close $f;
  55        $ENV{"CVSROOT"} = $opt_d;
  56} elsif($ENV{"CVSROOT"}) {
  57        $opt_d = $ENV{"CVSROOT"};
  58} else {
  59        die "CVSROOT needs to be set";
  60}
  61$opt_o ||= "origin";
  62my $git_tree = $opt_C;
  63$git_tree ||= ".";
  64
  65my $cvs_tree;
  66if ($#ARGV == 0) {
  67        $cvs_tree = $ARGV[0];
  68} elsif (-f 'CVS/Repository') {
  69        open my $f, '<', 'CVS/Repository' or 
  70            die 'Failed to open CVS/Repository';
  71        $cvs_tree = <$f>;
  72        chomp $cvs_tree;
  73        close $f
  74} else {
  75        usage();
  76}
  77
  78select(STDERR); $|=1; select(STDOUT);
  79
  80
  81package CVSconn;
  82# Basic CVS dialog.
  83# We're only interested in connecting and downloading, so ...
  84
  85use File::Spec;
  86use File::Temp qw(tempfile);
  87use POSIX qw(strftime dup2);
  88
  89sub new {
  90        my($what,$repo,$subdir) = @_;
  91        $what=ref($what) if ref($what);
  92
  93        my $self = {};
  94        $self->{'buffer'} = "";
  95        bless($self,$what);
  96
  97        $repo =~ s#/+$##;
  98        $self->{'fullrep'} = $repo;
  99        $self->conn();
 100
 101        $self->{'subdir'} = $subdir;
 102        $self->{'lines'} = undef;
 103
 104        return $self;
 105}
 106
 107sub conn {
 108        my $self = shift;
 109        my $repo = $self->{'fullrep'};
 110        if($repo =~ s/^:pserver:(?:(.*?)(?::(.*?))?@)?([^:\/]*)(?::(\d*))?//) {
 111                my($user,$pass,$serv,$port) = ($1,$2,$3,$4);
 112                $user="anonymous" unless defined $user;
 113                my $rr2 = "-";
 114                unless($port) {
 115                        $rr2 = ":pserver:$user\@$serv:$repo";
 116                        $port=2401;
 117                }
 118                my $rr = ":pserver:$user\@$serv:$port$repo";
 119
 120                unless($pass) {
 121                        open(H,$ENV{'HOME'}."/.cvspass") and do {
 122                                # :pserver:cvs@mea.tmt.tele.fi:/cvsroot/zmailer Ah<Z
 123                                while(<H>) {
 124                                        chomp;
 125                                        s/^\/\d+\s+//;
 126                                        my ($w,$p) = split(/\s/,$_,2);
 127                                        if($w eq $rr or $w eq $rr2) {
 128                                                $pass = $p;
 129                                                last;
 130                                        }
 131                                }
 132                        };
 133                }
 134                $pass="A" unless $pass;
 135
 136                my $s = IO::Socket::INET->new(PeerHost => $serv, PeerPort => $port);
 137                die "Socket to $serv: $!\n" unless defined $s;
 138                $s->write("BEGIN AUTH REQUEST\n$repo\n$user\n$pass\nEND AUTH REQUEST\n")
 139                        or die "Write to $serv: $!\n";
 140                $s->flush();
 141
 142                my $rep = <$s>;
 143
 144                if($rep ne "I LOVE YOU\n") {
 145                        $rep="<unknown>" unless $rep;
 146                        die "AuthReply: $rep\n";
 147                }
 148                $self->{'socketo'} = $s;
 149                $self->{'socketi'} = $s;
 150        } else { # local or ext: Fork off our own cvs server.
 151                my $pr = IO::Pipe->new();
 152                my $pw = IO::Pipe->new();
 153                my $pid = fork();
 154                die "Fork: $!\n" unless defined $pid;
 155                my $cvs = 'cvs';
 156                $cvs = $ENV{CVS_SERVER} if exists $ENV{CVS_SERVER};
 157                my $rsh = 'rsh';
 158                $rsh = $ENV{CVS_RSH} if exists $ENV{CVS_RSH};
 159
 160                my @cvs = ($cvs, 'server');
 161                my ($local, $user, $host);
 162                $local = $repo =~ s/:local://;
 163                if (!$local) {
 164                    $repo =~ s/:ext://;
 165                    $local = !($repo =~ s/^(?:([^\@:]+)\@)?([^:]+)://);
 166                    ($user, $host) = ($1, $2);
 167                }
 168                if (!$local) {
 169                    if ($user) {
 170                        unshift @cvs, $rsh, '-l', $user, $host;
 171                    } else {
 172                        unshift @cvs, $rsh, $host;
 173                    }
 174                }
 175
 176                unless($pid) {
 177                        $pr->writer();
 178                        $pw->reader();
 179                        dup2($pw->fileno(),0);
 180                        dup2($pr->fileno(),1);
 181                        $pr->close();
 182                        $pw->close();
 183                        exec(@cvs);
 184                }
 185                $pw->writer();
 186                $pr->reader();
 187                $self->{'socketo'} = $pw;
 188                $self->{'socketi'} = $pr;
 189        }
 190        $self->{'socketo'}->write("Root $repo\n");
 191
 192        # Trial and error says that this probably is the minimum set
 193        $self->{'socketo'}->write("Valid-responses ok error Valid-requests Mode M Mbinary E F Checked-in Created Updated Merged Removed\n");
 194
 195        $self->{'socketo'}->write("valid-requests\n");
 196        $self->{'socketo'}->flush();
 197
 198        chomp(my $rep=$self->readline());
 199        if($rep !~ s/^Valid-requests\s*//) {
 200                $rep="<unknown>" unless $rep;
 201                die "Expected Valid-requests from server, but got: $rep\n";
 202        }
 203        chomp(my $res=$self->readline());
 204        die "validReply: $res\n" if $res ne "ok";
 205
 206        $self->{'socketo'}->write("UseUnchanged\n") if $rep =~ /\bUseUnchanged\b/;
 207        $self->{'repo'} = $repo;
 208}
 209
 210sub readline {
 211        my($self) = @_;
 212        return $self->{'socketi'}->getline();
 213}
 214
 215sub _file {
 216        # Request a file with a given revision.
 217        # Trial and error says this is a good way to do it. :-/
 218        my($self,$fn,$rev) = @_;
 219        $self->{'socketo'}->write("Argument -N\n") or return undef;
 220        $self->{'socketo'}->write("Argument -P\n") or return undef;
 221        # $self->{'socketo'}->write("Argument -ko\n") or return undef;
 222        # -ko: Linus' version doesn't use it
 223        $self->{'socketo'}->write("Argument -r\n") or return undef;
 224        $self->{'socketo'}->write("Argument $rev\n") or return undef;
 225        $self->{'socketo'}->write("Argument --\n") or return undef;
 226        $self->{'socketo'}->write("Argument $self->{'subdir'}/$fn\n") or return undef;
 227        $self->{'socketo'}->write("Directory .\n") or return undef;
 228        $self->{'socketo'}->write("$self->{'repo'}\n") or return undef;
 229        # $self->{'socketo'}->write("Sticky T1.0\n") or return undef;
 230        $self->{'socketo'}->write("co\n") or return undef;
 231        $self->{'socketo'}->flush() or return undef;
 232        $self->{'lines'} = 0;
 233        return 1;
 234}
 235sub _line {
 236        # Read a line from the server.
 237        # ... except that 'line' may be an entire file. ;-)
 238        my($self, $fh) = @_;
 239        die "Not in lines" unless defined $self->{'lines'};
 240
 241        my $line;
 242        my $res=0;
 243        while(defined($line = $self->readline())) {
 244                # M U gnupg-cvs-rep/AUTHORS
 245                # Updated gnupg-cvs-rep/
 246                # /daten/src/rsync/gnupg-cvs-rep/AUTHORS
 247                # /AUTHORS/1.1///T1.1
 248                # u=rw,g=rw,o=rw
 249                # 0
 250                # ok
 251
 252                if($line =~ s/^(?:Created|Updated) //) {
 253                        $line = $self->readline(); # path
 254                        $line = $self->readline(); # Entries line
 255                        my $mode = $self->readline(); chomp $mode;
 256                        $self->{'mode'} = $mode;
 257                        defined (my $cnt = $self->readline())
 258                                or die "EOF from server after 'Changed'\n";
 259                        chomp $cnt;
 260                        die "Duh: Filesize $cnt" if $cnt !~ /^\d+$/;
 261                        $line="";
 262                        $res=0;
 263                        while($cnt) {
 264                                my $buf;
 265                                my $num = $self->{'socketi'}->read($buf,$cnt);
 266                                die "Server: Filesize $cnt: $num: $!\n" if not defined $num or $num<=0;
 267                                print $fh $buf;
 268                                $res += $num;
 269                                $cnt -= $num;
 270                        }
 271                } elsif($line =~ s/^ //) {
 272                        print $fh $line;
 273                        $res += length($line);
 274                } elsif($line =~ /^M\b/) {
 275                        # output, do nothing
 276                } elsif($line =~ /^Mbinary\b/) {
 277                        my $cnt;
 278                        die "EOF from server after 'Mbinary'" unless defined ($cnt = $self->readline());
 279                        chomp $cnt;
 280                        die "Duh: Mbinary $cnt" if $cnt !~ /^\d+$/ or $cnt<1;
 281                        $line="";
 282                        while($cnt) {
 283                                my $buf;
 284                                my $num = $self->{'socketi'}->read($buf,$cnt);
 285                                die "S: Mbinary $cnt: $num: $!\n" if not defined $num or $num<=0;
 286                                print $fh $buf;
 287                                $res += $num;
 288                                $cnt -= $num;
 289                        }
 290                } else {
 291                        chomp $line;
 292                        if($line eq "ok") {
 293                                # print STDERR "S: ok (".length($res).")\n";
 294                                return $res;
 295                        } elsif($line =~ s/^E //) {
 296                                # print STDERR "S: $line\n";
 297                        } else {
 298                                die "Unknown: $line\n";
 299                        }
 300                }
 301        }
 302}
 303sub file {
 304        my($self,$fn,$rev) = @_;
 305        my $res;
 306
 307        my ($fh, $name) = tempfile('gitcvs.XXXXXX', 
 308                    DIR => File::Spec->tmpdir(), UNLINK => 1);
 309
 310        $self->_file($fn,$rev) and $res = $self->_line($fh);
 311
 312        if (!defined $res) {
 313            # retry
 314            $self->conn();
 315            $self->_file($fn,$rev)
 316                    or die "No file command send\n";
 317            $res = $self->_line($fh);
 318            die "No input: $fn $rev\n" unless defined $res;
 319        }
 320        close ($fh);
 321
 322        return ($name, $res);
 323}
 324
 325
 326package main;
 327
 328my $cvs = CVSconn->new($opt_d, $cvs_tree);
 329
 330
 331sub pdate($) {
 332        my($d) = @_;
 333        m#(\d{2,4})/(\d\d)/(\d\d)\s(\d\d):(\d\d)(?::(\d\d))?#
 334                or die "Unparseable date: $d\n";
 335        my $y=$1; $y-=1900 if $y>1900;
 336        return timegm($6||0,$5,$4,$3,$2-1,$y);
 337}
 338
 339sub pmode($) {
 340        my($mode) = @_;
 341        my $m = 0;
 342        my $mm = 0;
 343        my $um = 0;
 344        for my $x(split(//,$mode)) {
 345                if($x eq ",") {
 346                        $m |= $mm&$um;
 347                        $mm = 0;
 348                        $um = 0;
 349                } elsif($x eq "u") { $um |= 0700;
 350                } elsif($x eq "g") { $um |= 0070;
 351                } elsif($x eq "o") { $um |= 0007;
 352                } elsif($x eq "r") { $mm |= 0444;
 353                } elsif($x eq "w") { $mm |= 0222;
 354                } elsif($x eq "x") { $mm |= 0111;
 355                } elsif($x eq "=") { # do nothing
 356                } else { die "Unknown mode: $mode\n";
 357                }
 358        }
 359        $m |= $mm&$um;
 360        return $m;
 361}
 362
 363sub getwd() {
 364        my $pwd = `pwd`;
 365        chomp $pwd;
 366        return $pwd;
 367}
 368
 369-d $git_tree
 370        or mkdir($git_tree,0777)
 371        or die "Could not create $git_tree: $!";
 372chdir($git_tree);
 373
 374my $last_branch = "";
 375my $orig_branch = "";
 376my $forward_master = 0;
 377my %branch_date;
 378
 379my $git_dir = $ENV{"GIT_DIR"} || ".git";
 380$git_dir = getwd()."/".$git_dir unless $git_dir =~ m#^/#;
 381$ENV{"GIT_DIR"} = $git_dir;
 382my $orig_git_index;
 383$orig_git_index = $ENV{GIT_INDEX_FILE} if exists $ENV{GIT_INDEX_FILE};
 384my ($git_ih, $git_index) = tempfile('gitXXXXXX', SUFFIX => '.idx',
 385                                    DIR => File::Spec->tmpdir());
 386close ($git_ih);
 387$ENV{GIT_INDEX_FILE} = $git_index;
 388unless(-d $git_dir) {
 389        system("git-init-db");
 390        die "Cannot init the GIT db at $git_tree: $?\n" if $?;
 391        system("git-read-tree");
 392        die "Cannot init an empty tree: $?\n" if $?;
 393
 394        $last_branch = $opt_o;
 395        $orig_branch = "";
 396} else {
 397        -f "$git_dir/refs/heads/$opt_o"
 398                or die "Branch '$opt_o' does not exist.\n".
 399                       "Either use the correct '-o branch' option,\n".
 400                       "or import to a new repository.\n";
 401
 402        $last_branch = basename(readlink("$git_dir/HEAD"));
 403        unless($last_branch) {
 404                warn "Cannot read the last branch name: $! -- assuming 'master'\n";
 405                $last_branch = "master";
 406        }
 407        $orig_branch = $last_branch;
 408        if (-f "$git_dir/CVS2GIT_HEAD") {
 409                die <<EOM;
 410CVS2GIT_HEAD exists.
 411Make sure your working directory corresponds to HEAD and remove CVS2GIT_HEAD.
 412You may need to run
 413
 414    git-read-tree -m -u CVS2GIT_HEAD HEAD
 415EOM
 416        }
 417        system('cp', "$git_dir/HEAD", "$git_dir/CVS2GIT_HEAD");
 418
 419        $forward_master =
 420            $opt_o ne 'master' && -f "$git_dir/refs/heads/master" &&
 421            system('cmp', '-s', "$git_dir/refs/heads/master", 
 422                                "$git_dir/refs/heads/$opt_o") == 0;
 423
 424        # populate index
 425        system('git-read-tree', $last_branch);
 426        die "read-tree failed: $?\n" if $?;
 427
 428        # Get the last import timestamps
 429        opendir(D,"$git_dir/refs/heads");
 430        while(defined(my $head = readdir(D))) {
 431                next if $head =~ /^\./;
 432                open(F,"$git_dir/refs/heads/$head")
 433                        or die "Bad head branch: $head: $!\n";
 434                chomp(my $ftag = <F>);
 435                close(F);
 436                open(F,"git-cat-file commit $ftag |");
 437                while(<F>) {
 438                        next unless /^author\s.*\s(\d+)\s[-+]\d{4}$/;
 439                        $branch_date{$head} = $1;
 440                        last;
 441                }
 442                close(F);
 443        }
 444        closedir(D);
 445}
 446
 447-d $git_dir
 448        or die "Could not create git subdir ($git_dir).\n";
 449
 450my $pid = open(CVS,"-|");
 451die "Cannot fork: $!\n" unless defined $pid;
 452unless($pid) {
 453        my @opt;
 454        @opt = split(/,/,$opt_p) if defined $opt_p;
 455        unshift @opt, '-z', $opt_z if defined $opt_z;
 456        exec("cvsps",@opt,"-u","-A","--cvs-direct",'--root',$opt_d,$cvs_tree);
 457        die "Could not start cvsps: $!\n";
 458}
 459
 460
 461## cvsps output:
 462#---------------------
 463#PatchSet 314
 464#Date: 1999/09/18 13:03:59
 465#Author: wkoch
 466#Branch: STABLE-BRANCH-1-0
 467#Ancestor branch: HEAD
 468#Tag: (none)
 469#Log:
 470#    See ChangeLog: Sat Sep 18 13:03:28 CEST 1999  Werner Koch
 471#Members:
 472#       README:1.57->1.57.2.1
 473#       VERSION:1.96->1.96.2.1
 474#
 475#---------------------
 476
 477my $state = 0;
 478
 479my($patchset,$date,$author,$branch,$ancestor,$tag,$logmsg);
 480my(@old,@new);
 481my $commit = sub {
 482        my $pid;
 483        while(@old) {
 484                my @o2;
 485                if(@old > 55) {
 486                        @o2 = splice(@old,0,50);
 487                } else {
 488                        @o2 = @old;
 489                        @old = ();
 490                }
 491                system("git-update-cache","--force-remove","--",@o2);
 492                die "Cannot remove files: $?\n" if $?;
 493        }
 494        while(@new) {
 495                my @n2;
 496                if(@new > 12) {
 497                        @n2 = splice(@new,0,10);
 498                } else {
 499                        @n2 = @new;
 500                        @new = ();
 501                }
 502                system("git-update-cache","--add",
 503                        (map { ('--cacheinfo', @$_) } @n2));
 504                die "Cannot add files: $?\n" if $?;
 505        }
 506
 507        $pid = open(C,"-|");
 508        die "Cannot fork: $!" unless defined $pid;
 509        unless($pid) {
 510                exec("git-write-tree");
 511                die "Cannot exec git-write-tree: $!\n";
 512        }
 513        chomp(my $tree = <C>);
 514        length($tree) == 40
 515                or die "Cannot get tree id ($tree): $!\n";
 516        close(C)
 517                or die "Error running git-write-tree: $?\n";
 518        print "Tree ID $tree\n" if $opt_v;
 519
 520        my $parent = "";
 521        if(open(C,"$git_dir/refs/heads/$last_branch")) {
 522                chomp($parent = <C>);
 523                close(C);
 524                length($parent) == 40
 525                        or die "Cannot get parent id ($parent): $!\n";
 526                print "Parent ID $parent\n" if $opt_v;
 527        }
 528
 529        my $pr = IO::Pipe->new() or die "Cannot open pipe: $!\n";
 530        my $pw = IO::Pipe->new() or die "Cannot open pipe: $!\n";
 531        $pid = fork();
 532        die "Fork: $!\n" unless defined $pid;
 533        unless($pid) {
 534                $pr->writer();
 535                $pw->reader();
 536                dup2($pw->fileno(),0);
 537                dup2($pr->fileno(),1);
 538                $pr->close();
 539                $pw->close();
 540
 541                my @par = ();
 542                @par = ("-p",$parent) if $parent;
 543                exec("env",
 544                        "GIT_AUTHOR_NAME=$author",
 545                        "GIT_AUTHOR_EMAIL=$author",
 546                        "GIT_AUTHOR_DATE=".strftime("+0000 %Y-%m-%d %H:%M:%S",gmtime($date)),
 547                        "GIT_COMMITTER_NAME=$author",
 548                        "GIT_COMMITTER_EMAIL=$author",
 549                        "GIT_COMMITTER_DATE=".strftime("+0000 %Y-%m-%d %H:%M:%S",gmtime($date)),
 550                        "git-commit-tree", $tree,@par);
 551                die "Cannot exec git-commit-tree: $!\n";
 552        }
 553        $pw->writer();
 554        $pr->reader();
 555
 556        # compatibility with git2cvs
 557        substr($logmsg,32767) = "" if length($logmsg) > 32767;
 558        $logmsg =~ s/[\s\n]+\z//;
 559
 560        print $pw "$logmsg\n"
 561                or die "Error writing to git-commit-tree: $!\n";
 562        $pw->close();
 563
 564        print "Committed patch $patchset ($branch)\n" if $opt_v;
 565        chomp(my $cid = <$pr>);
 566        length($cid) == 40
 567                or die "Cannot get commit id ($cid): $!\n";
 568        print "Commit ID $cid\n" if $opt_v;
 569        $pr->close();
 570
 571        waitpid($pid,0);
 572        die "Error running git-commit-tree: $?\n" if $?;
 573
 574        open(C,">$git_dir/refs/heads/$branch")
 575                or die "Cannot open branch $branch for update: $!\n";
 576        print C "$cid\n"
 577                or die "Cannot write branch $branch for update: $!\n";
 578        close(C)
 579                or die "Cannot write branch $branch for update: $!\n";
 580
 581        if($tag) {
 582                open(C,">$git_dir/refs/tags/$tag")
 583                        or die "Cannot create tag $tag: $!\n";
 584                print C "$cid\n"
 585                        or die "Cannot write tag $branch: $!\n";
 586                close(C)
 587                        or die "Cannot write tag $branch: $!\n";
 588                print "Created tag '$tag' on '$branch'\n" if $opt_v;
 589        }
 590};
 591
 592while(<CVS>) {
 593        chomp;
 594        if($state == 0 and /^-+$/) {
 595                $state = 1;
 596        } elsif($state == 0) {
 597                $state = 1;
 598                redo;
 599        } elsif(($state==0 or $state==1) and s/^PatchSet\s+//) {
 600                $patchset = 0+$_;
 601                $state=2;
 602        } elsif($state == 2 and s/^Date:\s+//) {
 603                $date = pdate($_);
 604                unless($date) {
 605                        print STDERR "Could not parse date: $_\n";
 606                        $state=0;
 607                        next;
 608                }
 609                $state=3;
 610        } elsif($state == 3 and s/^Author:\s+//) {
 611                s/\s+$//;
 612                $author = $_;
 613                $state = 4;
 614        } elsif($state == 4 and s/^Branch:\s+//) {
 615                s/\s+$//;
 616                $branch = $_;
 617                $state = 5;
 618        } elsif($state == 5 and s/^Ancestor branch:\s+//) {
 619                s/\s+$//;
 620                $ancestor = $_;
 621                $ancestor = $opt_o if $ancestor eq "HEAD";
 622                $state = 6;
 623        } elsif($state == 5) {
 624                $ancestor = undef;
 625                $state = 6;
 626                redo;
 627        } elsif($state == 6 and s/^Tag:\s+//) {
 628                s/\s+$//;
 629                if($_ eq "(none)") {
 630                        $tag = undef;
 631                } else {
 632                        $tag = $_;
 633                }
 634                $state = 7;
 635        } elsif($state == 7 and /^Log:/) {
 636                $logmsg = "";
 637                $state = 8;
 638        } elsif($state == 8 and /^Members:/) {
 639                $branch = $opt_o if $branch eq "HEAD";
 640                if(defined $branch_date{$branch} and $branch_date{$branch} >= $date) {
 641                        # skip
 642                        print "skip patchset $patchset: $date before $branch_date{$branch}\n" if $opt_v;
 643                        $state = 11;
 644                        next;
 645                }
 646                if($ancestor) {
 647                        if(-f "$git_dir/refs/heads/$branch") {
 648                                print STDERR "Branch $branch already exists!\n";
 649                                $state=11;
 650                                next;
 651                        }
 652                        unless(open(H,"$git_dir/refs/heads/$ancestor")) {
 653                                print STDERR "Branch $ancestor does not exist!\n";
 654                                $state=11;
 655                                next;
 656                        }
 657                        chomp(my $id = <H>);
 658                        close(H);
 659                        unless(open(H,"> $git_dir/refs/heads/$branch")) {
 660                                print STDERR "Could not create branch $branch: $!\n";
 661                                $state=11;
 662                                next;
 663                        }
 664                        print H "$id\n"
 665                                or die "Could not write branch $branch: $!";
 666                        close(H)
 667                                or die "Could not write branch $branch: $!";
 668                }
 669                if(($ancestor || $branch) ne $last_branch) {
 670                        print "Switching from $last_branch to $branch\n" if $opt_v;
 671                        system("git-read-tree", $branch);
 672                        die "read-tree failed: $?\n" if $?;
 673                }
 674                $last_branch = $branch if $branch ne $last_branch;
 675                $state = 9;
 676        } elsif($state == 8) {
 677                $logmsg .= "$_\n";
 678        } elsif($state == 9 and /^\s+(\S+):(INITIAL|\d(?:\.\d+)+)->(\d(?:\.\d+)+)\s*$/) {
 679#       VERSION:1.96->1.96.2.1
 680                my $init = ($2 eq "INITIAL");
 681                my $fn = $1;
 682                my $rev = $3;
 683                $fn =~ s#^/+##;
 684                my ($tmpname, $size) = $cvs->file($fn,$rev);
 685                print "".($init ? "New" : "Update")." $fn: $size bytes.\n" if $opt_v;
 686                open my $F, '-|', "git-write-blob $tmpname"
 687                        or die "Cannot create object: $!\n";
 688                my $sha = <$F>;
 689                chomp $sha;
 690                close $F;
 691                unlink($tmpname);
 692                my $mode = pmode($cvs->{'mode'});
 693                push(@new,[$mode, $sha, $fn]); # may be resurrected!
 694        } elsif($state == 9 and /^\s+(\S+):\d(?:\.\d+)+->(\d(?:\.\d+)+)\(DEAD\)\s*$/) {
 695                my $fn = $1;
 696                $fn =~ s#^/+##;
 697                push(@old,$fn);
 698        } elsif($state == 9 and /^\s*$/) {
 699                $state = 10;
 700        } elsif(($state == 9 or $state == 10) and /^-+$/) {
 701                &$commit();
 702                $state = 1;
 703        } elsif($state == 11 and /^-+$/) {
 704                $state = 1;
 705        } elsif(/^-+$/) { # end of unknown-line processing
 706                $state = 1;
 707        } elsif($state != 11) { # ignore stuff when skipping
 708                print "* UNKNOWN LINE * $_\n";
 709        }
 710}
 711&$commit() if $branch and $state != 11;
 712
 713unlink($git_index);
 714
 715if (defined $orig_git_index) {
 716        $ENV{GIT_INDEX_FILE} = $orig_git_index;
 717} else {
 718        delete $ENV{GIT_INDEX_FILE};
 719}
 720
 721# Now switch back to the branch we were in before all of this happened
 722if($orig_branch) {
 723        print "DONE\n" if $opt_v;
 724        system("cp","$git_dir/refs/heads/$opt_o","$git_dir/refs/heads/master")
 725                if $forward_master;
 726        system('git-read-tree', '-m', '-u', 'CVS2GIT_HEAD', 'HEAD');
 727        die "read-tree failed: $?\n" if $?;
 728} else {
 729        $orig_branch = "master";
 730        print "DONE; creating $orig_branch branch\n" if $opt_v;
 731        system("cp","$git_dir/refs/heads/$opt_o","$git_dir/refs/heads/master")
 732                unless -f "$git_dir/refs/heads/master";
 733        unlink("$git_dir/HEAD");
 734        symlink("refs/heads/$orig_branch","$git_dir/HEAD");
 735        system('git checkout');
 736        die "checkout failed: $?\n" if $?;
 737}
 738unlink("$git_dir/CVS2GIT_HEAD");