summaryrefslogtreecommitdiff
path: root/git-svnimport.perl
blob: f9318c85cde0fd574285d1266998904574fb6e4d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
#!/usr/bin/perl -w
 
# This tool is copyright (c) 2005, Matthias Urlichs.
# It is released under the Gnu Public License, version 2.
#
# The basic idea is to pull and analyze SVN changes.
#
# Checking out the files is done by a single long-running CVS connection
# / server process.
#
# The head revision is on branch "origin" by default.
# You can change that with the '-o' option.
 
require v5.8.0; # for shell-safe open("-|",LIST)
use strict;
use warnings;
use Getopt::Std;
use File::Spec;
use File::Temp qw(tempfile);
use File::Path qw(mkpath);
use File::Basename qw(basename dirname);
use Time::Local;
use IO::Pipe;
use POSIX qw(strftime dup2);
use IPC::Open2;
use SVN::Core;
use SVN::Ra;
 
die "Need CVN:COre 1.2.1 or better" if $SVN::Core::VERSION lt "1.2.1";
 
$SIG{'PIPE'}="IGNORE";
$ENV{'TZ'}="UTC";
 
our($opt_h,$opt_o,$opt_v,$opt_u,$opt_C,$opt_i,$opt_m,$opt_M,$opt_t,$opt_T,$opt_b,$opt_s,$opt_l);
 
sub usage() {
	print STDERR <<END;
Usage: ${\basename $0}     # fetch/update GIT from CVS
       [-o branch-for-HEAD] [-h] [-v] [-l max_num_changes]
       [-C GIT_repository] [-t tagname] [-T trunkname] [-b branchname]
       [-i] [-u] [-s start_chg] [-m] [-M regex] [SVN_URL]
END
	exit(1);
}
 
getopts("b:C:hil:mM:o:s:t:T:uv") or usage();
usage if $opt_h;
 
my $tag_name = $opt_t || "tags";
my $trunk_name = $opt_T || "trunk";
my $branch_name = $opt_b || "branches";
 
@ARGV <= 1 or usage();
 
$opt_o ||= "origin";
$opt_l = 100 unless defined $opt_l;
my $git_tree = $opt_C;
$git_tree ||= ".";
 
my $cvs_tree;
if ($#ARGV == 0) {
	$cvs_tree = $ARGV[0];
} elsif (-f 'CVS/Repository') {
	open my $f, '<', 'CVS/Repository' or 
	    die 'Failed to open CVS/Repository';
	$cvs_tree = <$f>;
	chomp $cvs_tree;
	close $f;
} else {
	usage();
}
 
our @mergerx = ();
if ($opt_m) {
	@mergerx = ( qr/\W(?:from|of|merge|merging|merged) (\w+)/i );
}
if ($opt_M) {
	push (@mergerx, qr/$opt_M/);
}
 
select(STDERR); $|=1; select(STDOUT);
 
 
package SVNconn;
# Basic SVN connection.
# We're only interested in connecting and downloading, so ...
 
use File::Spec;
use File::Temp qw(tempfile);
use POSIX qw(strftime dup2);
 
sub new {
	my($what,$repo) = @_;
	$what=ref($what) if ref($what);
 
	my $self = {};
	$self->{'buffer'} = "";
	bless($self,$what);
 
	$repo =~ s#/+$##;
	$self->{'fullrep'} = $repo;
	$self->conn();
 
	return $self;
}
 
sub conn {
	my $self = shift;
	my $repo = $self->{'fullrep'};
	my $s = SVN::Ra->new($repo);
 
	die "SVN connection to $repo: $!\n" unless defined $s;
	$self->{'svn'} = $s;
	$self->{'repo'} = $repo;
	$self->{'maxrev'} = $s->get_latest_revnum();
}
 
sub file {
	my($self,$path,$rev) = @_;
	my $res;
 
	my ($fh, $name) = tempfile('gitsvn.XXXXXX', 
		    DIR => File::Spec->tmpdir(), UNLINK => 1);
 
	print "... $rev $path ...\n" if $opt_v;
	eval { $self->{'svn'}->get_file($path,$rev,$fh); };
	if ($@ and $@ !~ /Attempted to get checksum/) {
	    # retry
	    $self->conn();
		eval { $self->{'svn'}->get_file($path,$rev,$fh); };
	};
	return () if $@ and $@ !~ /Attempted to get checksum/;
	die $@ if $@;
	close ($fh);
 
	return ($name, $res);
}
 
 
package main;
 
my $svn = SVNconn->new($cvs_tree);
 
 
sub pdate($) {
	my($d) = @_;
	$d =~ m#(\d\d\d\d)-(\d\d)-(\d\d)T(\d\d):(\d\d):(\d\d)#
		or die "Unparseable date: $d\n";
	my $y=$1; $y-=1900 if $y>1900;
	return timegm($6||0,$5,$4,$3,$2-1,$y);
}
 
sub getwd() {
	my $pwd = `pwd`;
	chomp $pwd;
	return $pwd;
}
 
 
sub get_headref($$) {
    my $name    = shift;
    my $git_dir = shift; 
    my $sha;
 
    if (open(C,"$git_dir/refs/heads/$name")) {
	chomp($sha = <C>);
	close(C);
	length($sha) == 40
	    or die "Cannot get head id for $name ($sha): $!\n";
    }
    return $sha;
}
 
 
-d $git_tree
	or mkdir($git_tree,0777)
	or die "Could not create $git_tree: $!";
chdir($git_tree);
 
my $orig_branch = "";
my $forward_master = 0;
my %branches;
 
my $git_dir = $ENV{"GIT_DIR"} || ".git";
$git_dir = getwd()."/".$git_dir unless $git_dir =~ m#^/#;
$ENV{"GIT_DIR"} = $git_dir;
my $orig_git_index;
$orig_git_index = $ENV{GIT_INDEX_FILE} if exists $ENV{GIT_INDEX_FILE};
my ($git_ih, $git_index) = tempfile('gitXXXXXX', SUFFIX => '.idx',
				    DIR => File::Spec->tmpdir());
close ($git_ih);
$ENV{GIT_INDEX_FILE} = $git_index;
my $maxnum = 0;
my $last_rev = "";
my $last_branch;
my $current_rev = $opt_s ? ($opt_s-1) : 0;
unless(-d $git_dir) {
	system("git-init-db");
	die "Cannot init the GIT db at $git_tree: $?\n" if $?;
	system("git-read-tree");
	die "Cannot init an empty tree: $?\n" if $?;
 
	$last_branch = $opt_o;
	$orig_branch = "";
} else {
	-f "$git_dir/refs/heads/$opt_o"
		or die "Branch '$opt_o' does not exist.\n".
		       "Either use the correct '-o branch' option,\n".
		       "or import to a new repository.\n";
 
	-f "$git_dir/svn2git"
		or die "'$git_dir/svn2git' does not exist.\n".
		       "You need that file for incremental imports.\n";
	$last_branch = basename(readlink("$git_dir/HEAD"));
	unless($last_branch) {
		warn "Cannot read the last branch name: $! -- assuming 'master'\n";
		$last_branch = "master";
	}
	$orig_branch = $last_branch;
	$last_rev = get_headref($orig_branch, $git_dir);
	if (-f "$git_dir/SVN2GIT_HEAD") {
		die <<EOM;
SVN2GIT_HEAD exists.
Make sure your working directory corresponds to HEAD and remove SVN2GIT_HEAD.
You may need to run
 
    git-read-tree -m -u SVN2GIT_HEAD HEAD
EOM
	}
	system('cp', "$git_dir/HEAD", "$git_dir/SVN2GIT_HEAD");
 
	$forward_master =
	    $opt_o ne 'master' && -f "$git_dir/refs/heads/master" &&
	    system('cmp', '-s', "$git_dir/refs/heads/master", 
				"$git_dir/refs/heads/$opt_o") == 0;
 
	# populate index
	system('git-read-tree', $last_rev);
	die "read-tree failed: $?\n" if $?;
 
	# Get the last import timestamps
	open my $B,"<", "$git_dir/svn2git";
	while(<$B>) {
		chomp;
		my($num,$branch,$ref) = split;
		$branches{$branch}{$num} = $ref;
		$branches{$branch}{"LAST"} = $ref;
		$current_rev = $num if $current_rev < $num;
	}
	close($B);
}
-d $git_dir
	or die "Could not create git subdir ($git_dir).\n";
 
open BRANCHES,">>", "$git_dir/svn2git";
 
 
## cvsps output:
#---------------------
#PatchSet 314
#Date: 1999/09/18 13:03:59
#Author: wkoch
#Branch: STABLE-BRANCH-1-0
#Ancestor branch: HEAD
#Tag: (none)
#Log:
#    See ChangeLog: Sat Sep 18 13:03:28 CEST 1999  Werner Koch
#Members:
#	README:1.57->1.57.2.1
#	VERSION:1.96->1.96.2.1
#
#---------------------
 
my $state = 0;
 
sub get_file($$$) {
	my($rev,$branch,$path) = @_;
 
	# revert split_path(), below
	my $svnpath;
	$path = "" if $path eq "/"; # this should not happen, but ...
	if($branch eq "/") {
		$svnpath = "/$trunk_name/$path";
	} elsif($branch =~ m#^/#) {
		$svnpath = "/$tag_name$branch/$path";
	} else {
		$svnpath = "/$branch_name/$branch/$path";
	}
 
	# now get it
	my ($name, $res) = eval { $svn->file($svnpath,$rev); };
	return () unless defined $name;
 
	open my $F, '-|', "git-hash-object", "-w", $name
		or die "Cannot create object: $!\n";
	my $sha = <$F>;
	chomp $sha;
	close $F;
	unlink $name;
	my $mode = "0644"; # SV does not seem to store any file modes
	return [$mode, $sha, $path];
}
 
sub split_path($$) {
	my($rev,$path) = @_;
	my $branch;
 
	if($path =~ s#^/\Q$tag_name\E/([^/]+)/?##) {
		$branch = "/$1";
	} elsif($path =~ s#^/\Q$trunk_name\E/?##) {
		$branch = "/";
	} elsif($path =~ s#^/\Q$branch_name\E/([^/]+)/?##) {
		$branch = $1;
	} else {
		print STDERR "$rev: Unrecognized path: $path\n";
		return ()
	}
	$path = "/" if $path eq "";
	return ($branch,$path);
}
 
sub commit {
	my($branch, $changed_paths, $revision, $author, $date, $message) = @_;
	my($author_name,$author_email,$dest);
	my(@old,@new);
 
	if (not defined $author) {
		$author_name = $author_email = "unknown";
	} elsif ($author =~ /^(.*?)\s+<(.*)>$/) {
		($author_name, $author_email) = ($1, $2);
	} else {
		$author =~ s/^<(.*)>$/$1/;
		$author_name = $author_email = $author;
	}
	$date = pdate($date);
 
	my $tag;
	my $parent;
	if($branch eq "/") { # trunk
		$parent = $opt_o;
	} elsif($branch =~ m#^/(.+)#) { # tag
		$tag = 1;
		$parent = $1;
	} else { # "normal" branch
		# nothing to do
		$parent = $branch;
	}
	$dest = $parent;
 
	my $prev = $changed_paths->{"/"};
	if($prev and $prev->[0] eq "A") {
		delete $changed_paths->{"/"};
		my $oldpath = $prev->[1];
		my $rev;
		if(defined $oldpath) {
			my $p;
			($parent,$p) = split_path($revision,$oldpath);
			if($parent eq "/") {
				$parent = $opt_o;
			} else {
				$parent =~ s#^/##; # if it's a tag
			}
		} else {
			$parent = undef;
		}
	}
 
	my $rev;
	if($revision > $opt_s and defined $parent) {
		open(H,"git-rev-parse --verify $parent |");
		$rev = <H>;
		close(H) or do {
			print STDERR "$revision: cannot find commit '$parent'!\n";
			return;
		};
		chop $rev;
		if(length($rev) != 40) {
			print STDERR "$revision: cannot find commit '$parent'!\n";
			return;
		}
		$rev = $branches{($parent eq $opt_o) ? "/" : $parent}{"LAST"};
		if($revision != $opt_s and not $rev) {
			print STDERR "$revision: do not know ancestor for '$parent'!\n";
			return;
		}
	} else {
		$rev = undef;
	}
 
#	if($prev and $prev->[0] eq "A") {
#		if(not $tag) {
#			unless(open(H,"> $git_dir/refs/heads/$branch")) {
#				print STDERR "$revision: Could not create branch $branch: $!\n";
#				$state=11;
#				next;
#			}
#			print H "$rev\n"
#				or die "Could not write branch $branch: $!";
#			close(H)
#				or die "Could not write branch $branch: $!";
#		}
#	}
	if(not defined $rev) {
		unlink($git_index);
	} elsif ($rev ne $last_rev) {
		print "Switching from $last_rev to $rev ($branch)\n" if $opt_v;
		system("git-read-tree", $rev);
		die "read-tree failed for $rev: $?\n" if $?;
		$last_rev = $rev;
	}
 
	my $cid;
	if($tag and not %$changed_paths) {
		$cid = $rev;
	} else {
		while(my($path,$action) = each %$changed_paths) {
			if ($action->[0] eq "A") {
				my $f = get_file($revision,$branch,$path);
				push(@new,$f) if $f;
			} elsif ($action->[0] eq "D") {
				push(@old,$path);
			} elsif ($action->[0] eq "M") {
				my $f = get_file($revision,$branch,$path);
				push(@new,$f) if $f;
			} elsif ($action->[0] eq "R") {
				# refer to a file/tree in an earlier commit
				push(@old,$path); # remove any old stuff
 
				# ... and add any new stuff
				my($b,$p) = split_path($revision,$action->[1]);
				open my $F,"-|","git-ls-tree","-r","-z", $branches{$b}{$action->[2]}, $p;
				local $/ = '\0';
				while(<$F>) {
					chomp;
					my($m,$p) = split(/\t/,$_,2);
					my($mode,$type,$sha1) = split(/ /,$m);
					next if $type ne "blob";
					push(@new,[$mode,$sha1,$p]);
				}
			} else {
				die "$revision: unknown action '".$action->[0]."' for $path\n";
			}
		}
 
		if(@old) {
			open my $F, "-|", "git-ls-files", "-z", @old or die $!;
			@old = ();
			local $/ = '\0';
			while(<$F>) {
				chomp;
				push(@old,$_);
			}
			close($F);
 
			while(@old) {
				my @o2;
				if(@old > 55) {
					@o2 = splice(@old,0,50);
				} else {
					@o2 = @old;
					@old = ();
				}
				system("git-update-index","--force-remove","--",@o2);
				die "Cannot remove files: $?\n" if $?;
			}
		}
		while(@new) {
			my @n2;
			if(@new > 12) {
				@n2 = splice(@new,0,10);
			} else {
				@n2 = @new;
				@new = ();
			}
			system("git-update-index","--add",
				(map { ('--cacheinfo', @$_) } @n2));
			die "Cannot add files: $?\n" if $?;
		}
 
		my $pid = open(C,"-|");
		die "Cannot fork: $!" unless defined $pid;
		unless($pid) {
			exec("git-write-tree");
			die "Cannot exec git-write-tree: $!\n";
		}
		chomp(my $tree = <C>);
		length($tree) == 40
			or die "Cannot get tree id ($tree): $!\n";
		close(C)
			or die "Error running git-write-tree: $?\n";
		print "Tree ID $tree\n" if $opt_v;
 
		my $pr = IO::Pipe->new() or die "Cannot open pipe: $!\n";
		my $pw = IO::Pipe->new() or die "Cannot open pipe: $!\n";
		$pid = fork();
		die "Fork: $!\n" unless defined $pid;
		unless($pid) {
			$pr->writer();
			$pw->reader();
			open(OUT,">&STDOUT");
			dup2($pw->fileno(),0);
			dup2($pr->fileno(),1);
			$pr->close();
			$pw->close();
 
			my @par = ();
			@par = ("-p",$rev) if defined $rev;
 
			# loose detection of merges
			# based on the commit msg
			foreach my $rx (@mergerx) {
				if ($message =~ $rx) {
					my $mparent = $1;
					if ($mparent eq 'HEAD') { $mparent = $opt_o };
					if ( -e "$git_dir/refs/heads/$mparent") {
						$mparent = get_headref($mparent, $git_dir);
						push @par, '-p', $mparent;
						print OUT "Merge parent branch: $mparent\n" if $opt_v;
					}
				} 
			}
 
			exec("env",
				"GIT_AUTHOR_NAME=$author_name",
				"GIT_AUTHOR_EMAIL=$author_email",
				"GIT_AUTHOR_DATE=".strftime("+0000 %Y-%m-%d %H:%M:%S",gmtime($date)),
				"GIT_COMMITTER_NAME=$author_name",
				"GIT_COMMITTER_EMAIL=$author_email",
				"GIT_COMMITTER_DATE=".strftime("+0000 %Y-%m-%d %H:%M:%S",gmtime($date)),
				"git-commit-tree", $tree,@par);
			die "Cannot exec git-commit-tree: $!\n";
		}
		$pw->writer();
		$pr->reader();
 
		$message =~ s/[\s\n]+\z//;
 
		print $pw "$message\n"
			or die "Error writing to git-commit-tree: $!\n";
		$pw->close();
 
		print "Committed change $revision:$branch ".strftime("%Y-%m-%d %H:%M:%S",gmtime($date)).")\n" if $opt_v;
		chomp($cid = <$pr>);
		length($cid) == 40
			or die "Cannot get commit id ($cid): $!\n";
		print "Commit ID $cid\n" if $opt_v;
		$pr->close();
 
		waitpid($pid,0);
		die "Error running git-commit-tree: $?\n" if $?;
	}
 
	if(not defined $dest) {
		print "... no known parent\n" if $opt_v;
	} elsif(not $tag) {
		print "Writing to refs/heads/$dest\n" if $opt_v;
		open(C,">$git_dir/refs/heads/$dest") and 
		print C ("$cid\n") and
		close(C)
			or die "Cannot write branch $dest for update: $!\n";
	}
 
	if($tag) {
		my($in, $out) = ('','');
		$last_rev = "-" if %$changed_paths;
		# the tag was 'complex', i.e. did not refer to a "real" revision
 
		$dest =~ tr/_/\./ if $opt_u;
 
		my $pid = open2($in, $out, 'git-mktag');
		print $out ("object $cid\n".
		    "type commit\n".
		    "tag $dest\n".
		    "tagger $author_name <$author_email>\n") and
		close($out)
		    or die "Cannot create tag object $dest: $!\n";
 
		my $tagobj = <$in>;
		chomp $tagobj;
 
		if ( !close($in) or waitpid($pid, 0) != $pid or
				$? != 0 or $tagobj !~ /^[0123456789abcdef]{40}$/ ) {
			die "Cannot create tag object $dest: $!\n";
		}
 
		open(C,">$git_dir/refs/tags/$dest") and
		print C ("$tagobj\n") and
		close(C)
			or die "Cannot create tag $branch: $!\n";
 
		print "Created tag '$dest' on '$branch'\n" if $opt_v;
	}
	$branches{$branch}{"LAST"} = $cid;
	$branches{$branch}{$revision} = $cid;
	$last_rev = $cid;
	print BRANCHES "$revision $branch $cid\n";
	print "DONE: $revision $dest $cid\n" if $opt_v;
}
 
my ($changed_paths, $revision, $author, $date, $message, $pool) = @_;
sub _commit_all {
	($changed_paths, $revision, $author, $date, $message, $pool) = @_;
	my %p;
	while(my($path,$action) = each %$changed_paths) {
		$p{$path} = [ $action->action,$action->copyfrom_path, $action->copyfrom_rev ];
	}
	$changed_paths = \%p;
}
 
sub commit_all {
	my %done;
	my @col;
	my $pref;
	my $branch;
 
	while(my($path,$action) = each %$changed_paths) {
		($branch,$path) = split_path($revision,$path);
		next if not defined $branch;
		$done{$branch}{$path} = $action;
	}
	while(($branch,$changed_paths) = each %done) {
		commit($branch, $changed_paths, $revision, $author, $date, $message);
	}
}
 
while(++$current_rev <= $svn->{'maxrev'}) {
	$svn->{'svn'}->get_log("/",$current_rev,$current_rev,$current_rev,1,1,\&_commit_all,"");
	commit_all();
	if($opt_l and not --$opt_l) {
		print STDERR "Exiting due to a memory leak. Repeat, please.\n";
		last;
	}
}
 
 
unlink($git_index);
 
if (defined $orig_git_index) {
	$ENV{GIT_INDEX_FILE} = $orig_git_index;
} else {
	delete $ENV{GIT_INDEX_FILE};
}
 
# Now switch back to the branch we were in before all of this happened
if($orig_branch) {
	print "DONE\n" if $opt_v and (not defined $opt_l or $opt_l > 0);
	system("cp","$git_dir/refs/heads/$opt_o","$git_dir/refs/heads/master")
		if $forward_master;
	unless ($opt_i) {
		system('git-read-tree', '-m', '-u', 'SVN2GIT_HEAD', 'HEAD');
		die "read-tree failed: $?\n" if $?;
	}
} else {
	$orig_branch = "master";
	print "DONE; creating $orig_branch branch\n" if $opt_v and (not defined $opt_l or $opt_l > 0);
	system("cp","$git_dir/refs/heads/$opt_o","$git_dir/refs/heads/master")
		unless -f "$git_dir/refs/heads/master";
	unlink("$git_dir/HEAD");
	symlink("refs/heads/$orig_branch","$git_dir/HEAD");
	unless ($opt_i) {
		system('git checkout');
		die "checkout failed: $?\n" if $?;
	}
}
unlink("$git_dir/SVN2GIT_HEAD");
close(BRANCHES);