cvsimport: skip commits that are too recent (option and documentation)
[git] / git-cvsimport.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 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
16 use strict;
17 use warnings;
18 use Getopt::Std;
19 use File::Spec;
20 use File::Temp qw(tempfile tmpnam);
21 use File::Path qw(mkpath);
22 use File::Basename qw(basename dirname);
23 use Time::Local;
24 use IO::Socket;
25 use IO::Pipe;
26 use POSIX qw(strftime dup2 ENOENT);
27 use IPC::Open2;
28
29 $SIG{'PIPE'}="IGNORE";
30 $ENV{'TZ'}="UTC";
31
32 our ($opt_h,$opt_o,$opt_v,$opt_k,$opt_u,$opt_d,$opt_p,$opt_C,$opt_z,$opt_i,$opt_P, $opt_s,$opt_m,$opt_M,$opt_A,$opt_S,$opt_L, $opt_a);
33 my (%conv_author_name, %conv_author_email);
34
35 sub usage() {
36         print STDERR <<END;
37 Usage: ${\basename $0}     # fetch/update GIT from CVS
38        [-o branch-for-HEAD] [-h] [-v] [-d CVSROOT] [-A author-conv-file]
39        [-p opts-for-cvsps] [-C GIT_repository] [-z fuzz] [-i] [-k] [-u]
40        [-s subst] [-a] [-m] [-M regex] [-S regex] [CVS_module]
41 END
42         exit(1);
43 }
44
45 sub read_author_info($) {
46         my ($file) = @_;
47         my $user;
48         open my $f, '<', "$file" or die("Failed to open $file: $!\n");
49
50         while (<$f>) {
51                 # Expected format is this:
52                 #   exon=Andreas Ericsson <ae@op5.se>
53                 if (m/^(\S+?)\s*=\s*(.+?)\s*<(.+)>\s*$/) {
54                         $user = $1;
55                         $conv_author_name{$user} = $2;
56                         $conv_author_email{$user} = $3;
57                 }
58                 # However, we also read from CVSROOT/users format
59                 # to ease migration.
60                 elsif (/^(\w+):(['"]?)(.+?)\2\s*$/) {
61                         my $mapped;
62                         ($user, $mapped) = ($1, $3);
63                         if ($mapped =~ /^\s*(.*?)\s*<(.*)>\s*$/) {
64                                 $conv_author_name{$user} = $1;
65                                 $conv_author_email{$user} = $2;
66                         }
67                         elsif ($mapped =~ /^<?(.*)>?$/) {
68                                 $conv_author_name{$user} = $user;
69                                 $conv_author_email{$user} = $1;
70                         }
71                 }
72                 # NEEDSWORK: Maybe warn on unrecognized lines?
73         }
74         close ($f);
75 }
76
77 sub write_author_info($) {
78         my ($file) = @_;
79         open my $f, '>', $file or
80           die("Failed to open $file for writing: $!");
81
82         foreach (keys %conv_author_name) {
83                 print $f "$_=$conv_author_name{$_} <$conv_author_email{$_}>\n";
84         }
85         close ($f);
86 }
87
88 getopts("hivmkuo:d:p:C:z:s:M:P:A:S:L:") or usage();
89 usage if $opt_h;
90
91 @ARGV <= 1 or usage();
92
93 if ($opt_d) {
94         $ENV{"CVSROOT"} = $opt_d;
95 } elsif (-f 'CVS/Root') {
96         open my $f, '<', 'CVS/Root' or die 'Failed to open CVS/Root';
97         $opt_d = <$f>;
98         chomp $opt_d;
99         close $f;
100         $ENV{"CVSROOT"} = $opt_d;
101 } elsif ($ENV{"CVSROOT"}) {
102         $opt_d = $ENV{"CVSROOT"};
103 } else {
104         die "CVSROOT needs to be set";
105 }
106 $opt_o ||= "origin";
107 $opt_s ||= "-";
108 $opt_a ||= 0;
109
110 my $git_tree = $opt_C;
111 $git_tree ||= ".";
112
113 my $cvs_tree;
114 if ($#ARGV == 0) {
115         $cvs_tree = $ARGV[0];
116 } elsif (-f 'CVS/Repository') {
117         open my $f, '<', 'CVS/Repository' or 
118             die 'Failed to open CVS/Repository';
119         $cvs_tree = <$f>;
120         chomp $cvs_tree;
121         close $f;
122 } else {
123         usage();
124 }
125
126 our @mergerx = ();
127 if ($opt_m) {
128         @mergerx = ( qr/\W(?:from|of|merge|merging|merged) (\w+)/i );
129 }
130 if ($opt_M) {
131         push (@mergerx, qr/$opt_M/);
132 }
133
134 # Remember UTC of our starting time
135 # we'll want to avoid importing commits
136 # that are too recent
137 our $starttime = time();
138
139 select(STDERR); $|=1; select(STDOUT);
140
141
142 package CVSconn;
143 # Basic CVS dialog.
144 # We're only interested in connecting and downloading, so ...
145
146 use File::Spec;
147 use File::Temp qw(tempfile);
148 use POSIX qw(strftime dup2);
149
150 sub new {
151         my ($what,$repo,$subdir) = @_;
152         $what=ref($what) if ref($what);
153
154         my $self = {};
155         $self->{'buffer'} = "";
156         bless($self,$what);
157
158         $repo =~ s#/+$##;
159         $self->{'fullrep'} = $repo;
160         $self->conn();
161
162         $self->{'subdir'} = $subdir;
163         $self->{'lines'} = undef;
164
165         return $self;
166 }
167
168 sub conn {
169         my $self = shift;
170         my $repo = $self->{'fullrep'};
171         if ($repo =~ s/^:pserver(?:([^:]*)):(?:(.*?)(?::(.*?))?@)?([^:\/]*)(?::(\d*))?//) {
172                 my ($param,$user,$pass,$serv,$port) = ($1,$2,$3,$4,$5);
173
174                 my ($proxyhost,$proxyport);
175                 if ($param && ($param =~ m/proxy=([^;]+)/)) {
176                         $proxyhost = $1;
177                         # Default proxyport, if not specified, is 8080.
178                         $proxyport = 8080;
179                         if ($ENV{"CVS_PROXY_PORT"}) {
180                                 $proxyport = $ENV{"CVS_PROXY_PORT"};
181                         }
182                         if ($param =~ m/proxyport=([^;]+)/) {
183                                 $proxyport = $1;
184                         }
185                 }
186
187                 $user="anonymous" unless defined $user;
188                 my $rr2 = "-";
189                 unless ($port) {
190                         $rr2 = ":pserver:$user\@$serv:$repo";
191                         $port=2401;
192                 }
193                 my $rr = ":pserver:$user\@$serv:$port$repo";
194
195                 unless ($pass) {
196                         open(H,$ENV{'HOME'}."/.cvspass") and do {
197                                 # :pserver:cvs@mea.tmt.tele.fi:/cvsroot/zmailer Ah<Z
198                                 while (<H>) {
199                                         chomp;
200                                         s/^\/\d+\s+//;
201                                         my ($w,$p) = split(/\s/,$_,2);
202                                         if ($w eq $rr or $w eq $rr2) {
203                                                 $pass = $p;
204                                                 last;
205                                         }
206                                 }
207                         };
208                 }
209                 $pass="A" unless $pass;
210
211                 my ($s, $rep);
212                 if ($proxyhost) {
213
214                         # Use a HTTP Proxy. Only works for HTTP proxies that
215                         # don't require user authentication
216                         #
217                         # See: http://www.ietf.org/rfc/rfc2817.txt
218
219                         $s = IO::Socket::INET->new(PeerHost => $proxyhost, PeerPort => $proxyport);
220                         die "Socket to $proxyhost: $!\n" unless defined $s;
221                         $s->write("CONNECT $serv:$port HTTP/1.1\r\nHost: $serv:$port\r\n\r\n")
222                                 or die "Write to $proxyhost: $!\n";
223                         $s->flush();
224
225                         $rep = <$s>;
226
227                         # The answer should look like 'HTTP/1.x 2yy ....'
228                         if (!($rep =~ m#^HTTP/1\.. 2[0-9][0-9]#)) {
229                                 die "Proxy connect: $rep\n";
230                         }
231                         # Skip up to the empty line of the proxy server output
232                         # including the response headers.
233                         while ($rep = <$s>) {
234                                 last if (!defined $rep ||
235                                          $rep eq "\n" ||
236                                          $rep eq "\r\n");
237                         }
238                 } else {
239                         $s = IO::Socket::INET->new(PeerHost => $serv, PeerPort => $port);
240                         die "Socket to $serv: $!\n" unless defined $s;
241                 }
242
243                 $s->write("BEGIN AUTH REQUEST\n$repo\n$user\n$pass\nEND AUTH REQUEST\n")
244                         or die "Write to $serv: $!\n";
245                 $s->flush();
246
247                 $rep = <$s>;
248
249                 if ($rep ne "I LOVE YOU\n") {
250                         $rep="<unknown>" unless $rep;
251                         die "AuthReply: $rep\n";
252                 }
253                 $self->{'socketo'} = $s;
254                 $self->{'socketi'} = $s;
255         } else { # local or ext: Fork off our own cvs server.
256                 my $pr = IO::Pipe->new();
257                 my $pw = IO::Pipe->new();
258                 my $pid = fork();
259                 die "Fork: $!\n" unless defined $pid;
260                 my $cvs = 'cvs';
261                 $cvs = $ENV{CVS_SERVER} if exists $ENV{CVS_SERVER};
262                 my $rsh = 'rsh';
263                 $rsh = $ENV{CVS_RSH} if exists $ENV{CVS_RSH};
264
265                 my @cvs = ($cvs, 'server');
266                 my ($local, $user, $host);
267                 $local = $repo =~ s/:local://;
268                 if (!$local) {
269                     $repo =~ s/:ext://;
270                     $local = !($repo =~ s/^(?:([^\@:]+)\@)?([^:]+)://);
271                     ($user, $host) = ($1, $2);
272                 }
273                 if (!$local) {
274                     if ($user) {
275                         unshift @cvs, $rsh, '-l', $user, $host;
276                     } else {
277                         unshift @cvs, $rsh, $host;
278                     }
279                 }
280
281                 unless ($pid) {
282                         $pr->writer();
283                         $pw->reader();
284                         dup2($pw->fileno(),0);
285                         dup2($pr->fileno(),1);
286                         $pr->close();
287                         $pw->close();
288                         exec(@cvs);
289                 }
290                 $pw->writer();
291                 $pr->reader();
292                 $self->{'socketo'} = $pw;
293                 $self->{'socketi'} = $pr;
294         }
295         $self->{'socketo'}->write("Root $repo\n");
296
297         # Trial and error says that this probably is the minimum set
298         $self->{'socketo'}->write("Valid-responses ok error Valid-requests Mode M Mbinary E Checked-in Created Updated Merged Removed\n");
299
300         $self->{'socketo'}->write("valid-requests\n");
301         $self->{'socketo'}->flush();
302
303         chomp(my $rep=$self->readline());
304         if ($rep !~ s/^Valid-requests\s*//) {
305                 $rep="<unknown>" unless $rep;
306                 die "Expected Valid-requests from server, but got: $rep\n";
307         }
308         chomp(my $res=$self->readline());
309         die "validReply: $res\n" if $res ne "ok";
310
311         $self->{'socketo'}->write("UseUnchanged\n") if $rep =~ /\bUseUnchanged\b/;
312         $self->{'repo'} = $repo;
313 }
314
315 sub readline {
316         my ($self) = @_;
317         return $self->{'socketi'}->getline();
318 }
319
320 sub _file {
321         # Request a file with a given revision.
322         # Trial and error says this is a good way to do it. :-/
323         my ($self,$fn,$rev) = @_;
324         $self->{'socketo'}->write("Argument -N\n") or return undef;
325         $self->{'socketo'}->write("Argument -P\n") or return undef;
326         # -kk: Linus' version doesn't use it - defaults to off
327         if ($opt_k) {
328             $self->{'socketo'}->write("Argument -kk\n") or return undef;
329         }
330         $self->{'socketo'}->write("Argument -r\n") or return undef;
331         $self->{'socketo'}->write("Argument $rev\n") or return undef;
332         $self->{'socketo'}->write("Argument --\n") or return undef;
333         $self->{'socketo'}->write("Argument $self->{'subdir'}/$fn\n") or return undef;
334         $self->{'socketo'}->write("Directory .\n") or return undef;
335         $self->{'socketo'}->write("$self->{'repo'}\n") or return undef;
336         # $self->{'socketo'}->write("Sticky T1.0\n") or return undef;
337         $self->{'socketo'}->write("co\n") or return undef;
338         $self->{'socketo'}->flush() or return undef;
339         $self->{'lines'} = 0;
340         return 1;
341 }
342 sub _line {
343         # Read a line from the server.
344         # ... except that 'line' may be an entire file. ;-)
345         my ($self, $fh) = @_;
346         die "Not in lines" unless defined $self->{'lines'};
347
348         my $line;
349         my $res=0;
350         while (defined($line = $self->readline())) {
351                 # M U gnupg-cvs-rep/AUTHORS
352                 # Updated gnupg-cvs-rep/
353                 # /daten/src/rsync/gnupg-cvs-rep/AUTHORS
354                 # /AUTHORS/1.1///T1.1
355                 # u=rw,g=rw,o=rw
356                 # 0
357                 # ok
358
359                 if ($line =~ s/^(?:Created|Updated) //) {
360                         $line = $self->readline(); # path
361                         $line = $self->readline(); # Entries line
362                         my $mode = $self->readline(); chomp $mode;
363                         $self->{'mode'} = $mode;
364                         defined (my $cnt = $self->readline())
365                                 or die "EOF from server after 'Changed'\n";
366                         chomp $cnt;
367                         die "Duh: Filesize $cnt" if $cnt !~ /^\d+$/;
368                         $line="";
369                         $res = $self->_fetchfile($fh, $cnt);
370                 } elsif ($line =~ s/^ //) {
371                         print $fh $line;
372                         $res += length($line);
373                 } elsif ($line =~ /^M\b/) {
374                         # output, do nothing
375                 } elsif ($line =~ /^Mbinary\b/) {
376                         my $cnt;
377                         die "EOF from server after 'Mbinary'" unless defined ($cnt = $self->readline());
378                         chomp $cnt;
379                         die "Duh: Mbinary $cnt" if $cnt !~ /^\d+$/ or $cnt<1;
380                         $line="";
381                         $res += $self->_fetchfile($fh, $cnt);
382                 } else {
383                         chomp $line;
384                         if ($line eq "ok") {
385                                 # print STDERR "S: ok (".length($res).")\n";
386                                 return $res;
387                         } elsif ($line =~ s/^E //) {
388                                 # print STDERR "S: $line\n";
389                         } elsif ($line =~ /^(Remove-entry|Removed) /i) {
390                                 $line = $self->readline(); # filename
391                                 $line = $self->readline(); # OK
392                                 chomp $line;
393                                 die "Unknown: $line" if $line ne "ok";
394                                 return -1;
395                         } else {
396                                 die "Unknown: $line\n";
397                         }
398                 }
399         }
400         return undef;
401 }
402 sub file {
403         my ($self,$fn,$rev) = @_;
404         my $res;
405
406         my ($fh, $name) = tempfile('gitcvs.XXXXXX', 
407                     DIR => File::Spec->tmpdir(), UNLINK => 1);
408
409         $self->_file($fn,$rev) and $res = $self->_line($fh);
410
411         if (!defined $res) {
412             print STDERR "Server has gone away while fetching $fn $rev, retrying...\n";
413             truncate $fh, 0;
414             $self->conn();
415             $self->_file($fn,$rev) or die "No file command send";
416             $res = $self->_line($fh);
417             die "Retry failed" unless defined $res;
418         }
419         close ($fh);
420
421         return ($name, $res);
422 }
423 sub _fetchfile {
424         my ($self, $fh, $cnt) = @_;
425         my $res = 0;
426         my $bufsize = 1024 * 1024;
427         while ($cnt) {
428             if ($bufsize > $cnt) {
429                 $bufsize = $cnt;
430             }
431             my $buf;
432             my $num = $self->{'socketi'}->read($buf,$bufsize);
433             die "Server: Filesize $cnt: $num: $!\n" if not defined $num or $num<=0;
434             print $fh $buf;
435             $res += $num;
436             $cnt -= $num;
437         }
438         return $res;
439 }
440
441
442 package main;
443
444 my $cvs = CVSconn->new($opt_d, $cvs_tree);
445
446
447 sub pdate($) {
448         my ($d) = @_;
449         m#(\d{2,4})/(\d\d)/(\d\d)\s(\d\d):(\d\d)(?::(\d\d))?#
450                 or die "Unparseable date: $d\n";
451         my $y=$1; $y-=1900 if $y>1900;
452         return timegm($6||0,$5,$4,$3,$2-1,$y);
453 }
454
455 sub pmode($) {
456         my ($mode) = @_;
457         my $m = 0;
458         my $mm = 0;
459         my $um = 0;
460         for my $x(split(//,$mode)) {
461                 if ($x eq ",") {
462                         $m |= $mm&$um;
463                         $mm = 0;
464                         $um = 0;
465                 } elsif ($x eq "u") { $um |= 0700;
466                 } elsif ($x eq "g") { $um |= 0070;
467                 } elsif ($x eq "o") { $um |= 0007;
468                 } elsif ($x eq "r") { $mm |= 0444;
469                 } elsif ($x eq "w") { $mm |= 0222;
470                 } elsif ($x eq "x") { $mm |= 0111;
471                 } elsif ($x eq "=") { # do nothing
472                 } else { die "Unknown mode: $mode\n";
473                 }
474         }
475         $m |= $mm&$um;
476         return $m;
477 }
478
479 sub getwd() {
480         my $pwd = `pwd`;
481         chomp $pwd;
482         return $pwd;
483 }
484
485 sub is_sha1 {
486         my $s = shift;
487         return $s =~ /^[a-f0-9]{40}$/;
488 }
489
490 sub get_headref ($$) {
491     my $name    = shift;
492     my $git_dir = shift; 
493     
494     my $f = "$git_dir/refs/heads/$name";
495     if (open(my $fh, $f)) {
496             chomp(my $r = <$fh>);
497             is_sha1($r) or die "Cannot get head id for $name ($r): $!";
498             return $r;
499     }
500     die "unable to open $f: $!" unless $! == POSIX::ENOENT;
501     return undef;
502 }
503
504 -d $git_tree
505         or mkdir($git_tree,0777)
506         or die "Could not create $git_tree: $!";
507 chdir($git_tree);
508
509 my $last_branch = "";
510 my $orig_branch = "";
511 my %branch_date;
512 my $tip_at_start = undef;
513
514 my $git_dir = $ENV{"GIT_DIR"} || ".git";
515 $git_dir = getwd()."/".$git_dir unless $git_dir =~ m#^/#;
516 $ENV{"GIT_DIR"} = $git_dir;
517 my $orig_git_index;
518 $orig_git_index = $ENV{GIT_INDEX_FILE} if exists $ENV{GIT_INDEX_FILE};
519
520 my %index; # holds filenames of one index per branch
521
522 unless (-d $git_dir) {
523         system("git-init-db");
524         die "Cannot init the GIT db at $git_tree: $?\n" if $?;
525         system("git-read-tree");
526         die "Cannot init an empty tree: $?\n" if $?;
527
528         $last_branch = $opt_o;
529         $orig_branch = "";
530 } else {
531         -f "$git_dir/refs/heads/$opt_o"
532                 or die "Branch '$opt_o' does not exist.\n".
533                        "Either use the correct '-o branch' option,\n".
534                        "or import to a new repository.\n";
535
536         open(F, "git-symbolic-ref HEAD |") or
537                 die "Cannot run git-symbolic-ref: $!\n";
538         chomp ($last_branch = <F>);
539         $last_branch = basename($last_branch);
540         close(F);
541         unless ($last_branch) {
542                 warn "Cannot read the last branch name: $! -- assuming 'master'\n";
543                 $last_branch = "master";
544         }
545         $orig_branch = $last_branch;
546         $tip_at_start = `git-rev-parse --verify HEAD`;
547
548         # Get the last import timestamps
549         my $fmt = '($ref, $author) = (%(refname), %(author));';
550         open(H, "git-for-each-ref --perl --format='$fmt' refs/heads |") or
551                 die "Cannot run git-for-each-ref: $!\n";
552         while (defined(my $entry = <H>)) {
553                 my ($ref, $author);
554                 eval($entry) || die "cannot eval refs list: $@";
555                 my ($head) = ($ref =~ m|^refs/heads/(.*)|);
556                 $author =~ /^.*\s(\d+)\s[-+]\d{4}$/;
557                 $branch_date{$head} = $1;
558         }
559         close(H);
560 }
561
562 -d $git_dir
563         or die "Could not create git subdir ($git_dir).\n";
564
565 # now we read (and possibly save) author-info as well
566 -f "$git_dir/cvs-authors" and
567   read_author_info("$git_dir/cvs-authors");
568 if ($opt_A) {
569         read_author_info($opt_A);
570         write_author_info("$git_dir/cvs-authors");
571 }
572
573
574 #
575 # run cvsps into a file unless we are getting
576 # it passed as a file via $opt_P
577 #
578 unless ($opt_P) {
579         print "Running cvsps...\n" if $opt_v;
580         my $pid = open(CVSPS,"-|");
581         die "Cannot fork: $!\n" unless defined $pid;
582         unless ($pid) {
583                 my @opt;
584                 @opt = split(/,/,$opt_p) if defined $opt_p;
585                 unshift @opt, '-z', $opt_z if defined $opt_z;
586                 unshift @opt, '-q'         unless defined $opt_v;
587                 unless (defined($opt_p) && $opt_p =~ m/--no-cvs-direct/) {
588                         push @opt, '--cvs-direct';
589                 }
590                 exec("cvsps","--norc",@opt,"-u","-A",'--root',$opt_d,$cvs_tree);
591                 die "Could not start cvsps: $!\n";
592         }
593         my ($cvspsfh, $cvspsfile) = tempfile('gitXXXXXX', SUFFIX => '.cvsps',
594                                              DIR => File::Spec->tmpdir());
595         while (<CVSPS>) {
596             print $cvspsfh $_;
597         }
598         close CVSPS;
599         close $cvspsfh;
600         $opt_P = $cvspsfile;
601 }
602
603
604 open(CVS, "<$opt_P") or die $!;
605
606 ## cvsps output:
607 #---------------------
608 #PatchSet 314
609 #Date: 1999/09/18 13:03:59
610 #Author: wkoch
611 #Branch: STABLE-BRANCH-1-0
612 #Ancestor branch: HEAD
613 #Tag: (none)
614 #Log:
615 #    See ChangeLog: Sat Sep 18 13:03:28 CEST 1999  Werner Koch
616 #Members:
617 #       README:1.57->1.57.2.1
618 #       VERSION:1.96->1.96.2.1
619 #
620 #---------------------
621
622 my $state = 0;
623
624 sub update_index (\@\@) {
625         my $old = shift;
626         my $new = shift;
627         open(my $fh, '|-', qw(git-update-index -z --index-info))
628                 or die "unable to open git-update-index: $!";
629         print $fh
630                 (map { "0 0000000000000000000000000000000000000000\t$_\0" }
631                         @$old),
632                 (map { '100' . sprintf('%o', $_->[0]) . " $_->[1]\t$_->[2]\0" }
633                         @$new)
634                 or die "unable to write to git-update-index: $!";
635         close $fh
636                 or die "unable to write to git-update-index: $!";
637         $? and die "git-update-index reported error: $?";
638 }
639
640 sub write_tree () {
641         open(my $fh, '-|', qw(git-write-tree))
642                 or die "unable to open git-write-tree: $!";
643         chomp(my $tree = <$fh>);
644         is_sha1($tree)
645                 or die "Cannot get tree id ($tree): $!";
646         close($fh)
647                 or die "Error running git-write-tree: $?\n";
648         print "Tree ID $tree\n" if $opt_v;
649         return $tree;
650 }
651
652 my ($patchset,$date,$author_name,$author_email,$branch,$ancestor,$tag,$logmsg);
653 my (@old,@new,@skipped,%ignorebranch);
654
655 # commits that cvsps cannot place anywhere...
656 $ignorebranch{'#CVSPS_NO_BRANCH'} = 1;
657
658 sub commit {
659         if ($branch eq $opt_o && !$index{branch} && !get_headref($branch, $git_dir)) {
660             # looks like an initial commit
661             # use the index primed by git-init-db
662             $ENV{GIT_INDEX_FILE} = '.git/index';
663             $index{$branch} = '.git/index';
664         } else {
665             # use an index per branch to speed up
666             # imports of projects with many branches
667             unless ($index{$branch}) {
668                 $index{$branch} = tmpnam();
669                 $ENV{GIT_INDEX_FILE} = $index{$branch};
670                 if ($ancestor) {
671                     system("git-read-tree", $ancestor);
672                 } else {
673                     system("git-read-tree", $branch);
674                 }
675                 die "read-tree failed: $?\n" if $?;
676             }
677         }
678         $ENV{GIT_INDEX_FILE} = $index{$branch};
679
680         update_index(@old, @new);
681         @old = @new = ();
682         my $tree = write_tree();
683         my $parent = get_headref($last_branch, $git_dir);
684         print "Parent ID " . ($parent ? $parent : "(empty)") . "\n" if $opt_v;
685
686         my @commit_args;
687         push @commit_args, ("-p", $parent) if $parent;
688
689         # loose detection of merges
690         # based on the commit msg
691         foreach my $rx (@mergerx) {
692                 next unless $logmsg =~ $rx && $1;
693                 my $mparent = $1 eq 'HEAD' ? $opt_o : $1;
694                 if (my $sha1 = get_headref($mparent, $git_dir)) {
695                         push @commit_args, '-p', $mparent;
696                         print "Merge parent branch: $mparent\n" if $opt_v;
697                 }
698         }
699
700         my $commit_date = strftime("+0000 %Y-%m-%d %H:%M:%S",gmtime($date));
701         $ENV{GIT_AUTHOR_NAME} = $author_name;
702         $ENV{GIT_AUTHOR_EMAIL} = $author_email;
703         $ENV{GIT_AUTHOR_DATE} = $commit_date;
704         $ENV{GIT_COMMITTER_NAME} = $author_name;
705         $ENV{GIT_COMMITTER_EMAIL} = $author_email;
706         $ENV{GIT_COMMITTER_DATE} = $commit_date;
707         my $pid = open2(my $commit_read, my $commit_write,
708                 'git-commit-tree', $tree, @commit_args);
709
710         # compatibility with git2cvs
711         substr($logmsg,32767) = "" if length($logmsg) > 32767;
712         $logmsg =~ s/[\s\n]+\z//;
713
714         if (@skipped) {
715             $logmsg .= "\n\n\nSKIPPED:\n\t";
716             $logmsg .= join("\n\t", @skipped) . "\n";
717             @skipped = ();
718         }
719
720         print($commit_write "$logmsg\n") && close($commit_write)
721                 or die "Error writing to git-commit-tree: $!\n";
722
723         print "Committed patch $patchset ($branch $commit_date)\n" if $opt_v;
724         chomp(my $cid = <$commit_read>);
725         is_sha1($cid) or die "Cannot get commit id ($cid): $!\n";
726         print "Commit ID $cid\n" if $opt_v;
727         close($commit_read);
728
729         waitpid($pid,0);
730         die "Error running git-commit-tree: $?\n" if $?;
731
732         system("git-update-ref refs/heads/$branch $cid") == 0
733                 or die "Cannot write branch $branch for update: $!\n";
734
735         if ($tag) {
736                 my ($in, $out) = ('','');
737                 my ($xtag) = $tag;
738                 $xtag =~ s/\s+\*\*.*$//; # Remove stuff like ** INVALID ** and ** FUNKY **
739                 $xtag =~ tr/_/\./ if ( $opt_u );
740                 $xtag =~ s/[\/]/$opt_s/g;
741                 
742                 my $pid = open2($in, $out, 'git-mktag');
743                 print $out "object $cid\n".
744                     "type commit\n".
745                     "tag $xtag\n".
746                     "tagger $author_name <$author_email>\n"
747                     or die "Cannot create tag object $xtag: $!\n";
748                 close($out)
749                     or die "Cannot create tag object $xtag: $!\n";
750
751                 my $tagobj = <$in>;
752                 chomp $tagobj;
753
754                 if ( !close($in) or waitpid($pid, 0) != $pid or
755                      $? != 0 or $tagobj !~ /^[0123456789abcdef]{40}$/ ) {
756                     die "Cannot create tag object $xtag: $!\n";
757                 }
758                 
759
760                 open(C,">$git_dir/refs/tags/$xtag")
761                         or die "Cannot create tag $xtag: $!\n";
762                 print C "$tagobj\n"
763                         or die "Cannot write tag $xtag: $!\n";
764                 close(C)
765                         or die "Cannot write tag $xtag: $!\n";
766
767                 print "Created tag '$xtag' on '$branch'\n" if $opt_v;
768         }
769 };
770
771 my $commitcount = 1;
772 while (<CVS>) {
773         chomp;
774         if ($state == 0 and /^-+$/) {
775                 $state = 1;
776         } elsif ($state == 0) {
777                 $state = 1;
778                 redo;
779         } elsif (($state==0 or $state==1) and s/^PatchSet\s+//) {
780                 $patchset = 0+$_;
781                 $state=2;
782         } elsif ($state == 2 and s/^Date:\s+//) {
783                 $date = pdate($_);
784                 unless ($date) {
785                         print STDERR "Could not parse date: $_\n";
786                         $state=0;
787                         next;
788                 }
789                 $state=3;
790         } elsif ($state == 3 and s/^Author:\s+//) {
791                 s/\s+$//;
792                 if (/^(.*?)\s+<(.*)>/) {
793                     ($author_name, $author_email) = ($1, $2);
794                 } elsif ($conv_author_name{$_}) {
795                         $author_name = $conv_author_name{$_};
796                         $author_email = $conv_author_email{$_};
797                 } else {
798                     $author_name = $author_email = $_;
799                 }
800                 $state = 4;
801         } elsif ($state == 4 and s/^Branch:\s+//) {
802                 s/\s+$//;
803                 s/[\/]/$opt_s/g;
804                 $branch = $_;
805                 $state = 5;
806         } elsif ($state == 5 and s/^Ancestor branch:\s+//) {
807                 s/\s+$//;
808                 $ancestor = $_;
809                 $ancestor = $opt_o if $ancestor eq "HEAD";
810                 $state = 6;
811         } elsif ($state == 5) {
812                 $ancestor = undef;
813                 $state = 6;
814                 redo;
815         } elsif ($state == 6 and s/^Tag:\s+//) {
816                 s/\s+$//;
817                 if ($_ eq "(none)") {
818                         $tag = undef;
819                 } else {
820                         $tag = $_;
821                 }
822                 $state = 7;
823         } elsif ($state == 7 and /^Log:/) {
824                 $logmsg = "";
825                 $state = 8;
826         } elsif ($state == 8 and /^Members:/) {
827                 $branch = $opt_o if $branch eq "HEAD";
828                 if (defined $branch_date{$branch} and $branch_date{$branch} >= $date) {
829                         # skip
830                         print "skip patchset $patchset: $date before $branch_date{$branch}\n" if $opt_v;
831                         $state = 11;
832                         next;
833                 }
834                 if (!$opt_a && $starttime - 300 - (defined $opt_z ? $opt_z : 300) <= $date) {
835                         # skip if the commit is too recent
836                         # that the cvsps default fuzz is 300s, we give ourselves another
837                         # 300s just in case -- this also prevents skipping commits
838                         # due to server clock drift
839                         print "skip patchset $patchset: $date too recent\n" if $opt_v;
840                         $state = 11;
841                         next;
842                 }
843                 if (exists $ignorebranch{$branch}) {
844                         print STDERR "Skipping $branch\n";
845                         $state = 11;
846                         next;
847                 }
848                 if ($ancestor) {
849                         if ($ancestor eq $branch) {
850                                 print STDERR "Branch $branch erroneously stems from itself -- changed ancestor to $opt_o\n";
851                                 $ancestor = $opt_o;
852                         }
853                         if (-f "$git_dir/refs/heads/$branch") {
854                                 print STDERR "Branch $branch already exists!\n";
855                                 $state=11;
856                                 next;
857                         }
858                         unless (open(H,"$git_dir/refs/heads/$ancestor")) {
859                                 print STDERR "Branch $ancestor does not exist!\n";
860                                 $ignorebranch{$branch} = 1;
861                                 $state=11;
862                                 next;
863                         }
864                         chomp(my $id = <H>);
865                         close(H);
866                         unless (open(H,"> $git_dir/refs/heads/$branch")) {
867                                 print STDERR "Could not create branch $branch: $!\n";
868                                 $ignorebranch{$branch} = 1;
869                                 $state=11;
870                                 next;
871                         }
872                         print H "$id\n"
873                                 or die "Could not write branch $branch: $!";
874                         close(H)
875                                 or die "Could not write branch $branch: $!";
876                 }
877                 $last_branch = $branch if $branch ne $last_branch;
878                 $state = 9;
879         } elsif ($state == 8) {
880                 $logmsg .= "$_\n";
881         } elsif ($state == 9 and /^\s+(.+?):(INITIAL|\d+(?:\.\d+)+)->(\d+(?:\.\d+)+)\s*$/) {
882 #       VERSION:1.96->1.96.2.1
883                 my $init = ($2 eq "INITIAL");
884                 my $fn = $1;
885                 my $rev = $3;
886                 $fn =~ s#^/+##;
887                 if ($opt_S && $fn =~ m/$opt_S/) {
888                     print "SKIPPING $fn v $rev\n";
889                     push(@skipped, $fn);
890                     next;
891                 }
892                 print "Fetching $fn   v $rev\n" if $opt_v;
893                 my ($tmpname, $size) = $cvs->file($fn,$rev);
894                 if ($size == -1) {
895                         push(@old,$fn);
896                         print "Drop $fn\n" if $opt_v;
897                 } else {
898                         print "".($init ? "New" : "Update")." $fn: $size bytes\n" if $opt_v;
899                         my $pid = open(my $F, '-|');
900                         die $! unless defined $pid;
901                         if (!$pid) {
902                             exec("git-hash-object", "-w", $tmpname)
903                                 or die "Cannot create object: $!\n";
904                         }
905                         my $sha = <$F>;
906                         chomp $sha;
907                         close $F;
908                         my $mode = pmode($cvs->{'mode'});
909                         push(@new,[$mode, $sha, $fn]); # may be resurrected!
910                 }
911                 unlink($tmpname);
912         } elsif ($state == 9 and /^\s+(.+?):\d+(?:\.\d+)+->(\d+(?:\.\d+)+)\(DEAD\)\s*$/) {
913                 my $fn = $1;
914                 $fn =~ s#^/+##;
915                 push(@old,$fn);
916                 print "Delete $fn\n" if $opt_v;
917         } elsif ($state == 9 and /^\s*$/) {
918                 $state = 10;
919         } elsif (($state == 9 or $state == 10) and /^-+$/) {
920                 $commitcount++;
921                 if ($opt_L && $commitcount > $opt_L) {
922                         last;
923                 }
924                 commit();
925                 if (($commitcount & 1023) == 0) {
926                         system("git repack -a -d");
927                 }
928                 $state = 1;
929         } elsif ($state == 11 and /^-+$/) {
930                 $state = 1;
931         } elsif (/^-+$/) { # end of unknown-line processing
932                 $state = 1;
933         } elsif ($state != 11) { # ignore stuff when skipping
934                 print "* UNKNOWN LINE * $_\n";
935         }
936 }
937 commit() if $branch and $state != 11;
938
939 # The heuristic of repacking every 1024 commits can leave a
940 # lot of unpacked data.  If there is more than 1MB worth of
941 # not-packed objects, repack once more.
942 my $line = `git-count-objects`;
943 if ($line =~ /^(\d+) objects, (\d+) kilobytes$/) {
944   my ($n_objects, $kb) = ($1, $2);
945   1024 < $kb
946     and system("git repack -a -d");
947 }
948
949 foreach my $git_index (values %index) {
950     if ($git_index ne '.git/index') {
951         unlink($git_index);
952     }
953 }
954
955 if (defined $orig_git_index) {
956         $ENV{GIT_INDEX_FILE} = $orig_git_index;
957 } else {
958         delete $ENV{GIT_INDEX_FILE};
959 }
960
961 # Now switch back to the branch we were in before all of this happened
962 if ($orig_branch) {
963         print "DONE.\n" if $opt_v;
964         if ($opt_i) {
965                 exit 0;
966         }
967         my $tip_at_end = `git-rev-parse --verify HEAD`;
968         if ($tip_at_start ne $tip_at_end) {
969                 for ($tip_at_start, $tip_at_end) { chomp; }
970                 print "Fetched into the current branch.\n" if $opt_v;
971                 system(qw(git-read-tree -u -m),
972                        $tip_at_start, $tip_at_end);
973                 die "Fast-forward update failed: $?\n" if $?;
974         }
975         else {
976                 system(qw(git-merge cvsimport HEAD), "refs/heads/$opt_o");
977                 die "Could not merge $opt_o into the current branch.\n" if $?;
978         }
979 } else {
980         $orig_branch = "master";
981         print "DONE; creating $orig_branch branch\n" if $opt_v;
982         system("git-update-ref", "refs/heads/master", "refs/heads/$opt_o")
983                 unless -f "$git_dir/refs/heads/master";
984         system('git-update-ref', 'HEAD', "$orig_branch");
985         unless ($opt_i) {
986                 system('git checkout');
987                 die "checkout failed: $?\n" if $?;
988         }
989 }