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