/[svn2cvs]/trunk/svn2cvs.pl
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Contents of /trunk/svn2cvs.pl

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Revision 40 - (show annotations)
Fri Sep 7 18:43:51 2007 UTC (16 years, 7 months ago) by dpavlin
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if only action is directory removal, don't try to do it twice
1 #!/usr/bin/perl -w
2
3 # This script will transfer changes from Subversion repository
4 # to CVS repository (e.g. SourceForge) while preserving commit
5 # logs.
6 #
7 # Based on original shell version by Tollef Fog Heen available at
8 # http://raw.no/personal/blog
9 #
10 # 2004-03-09 Dobrica Pavlinusic <dpavlin@rot13.org>
11 #
12 # documentation is after __END__
13
14 use strict;
15 use File::Temp qw/ tempdir /;
16 use File::Path;
17 use Data::Dumper;
18 use XML::Simple;
19
20 # do we want to sync just part of repository?
21 my $partial_import = 1;
22
23 # do we want to add svk-like prefix with original revision, author and date?
24 my $decorate_commit_message = 1;
25
26 if (@ARGV < 2) {
27 print "usage: $0 SVN_URL CVSROOT CVSREPOSITORY\n";
28 exit 1;
29 }
30
31 my ($SVNROOT,$CVSROOT, $CVSREP) = @ARGV;
32
33 if ($SVNROOT !~ m,^[\w+]+:///*\w+,) {
34 print "ERROR: invalid svn root $SVNROOT\n";
35 exit 1;
36 }
37
38 # Ensure File::Temp::END can clean up:
39 $SIG{__DIE__} = sub { chdir("/tmp"); die @_ };
40
41 my $TMPDIR=tempdir( "/tmp/checkoutXXXXX", CLEANUP => 1 );
42
43 sub cd_tmp {
44 chdir($TMPDIR) || die "can't cd to $TMPDIR: $!";
45 }
46
47 sub cd_rep {
48 chdir("$TMPDIR/$CVSREP") || die "can't cd to $TMPDIR/$CVSREP: $!";
49 }
50
51 print "## using TMPDIR $TMPDIR\n";
52
53 # cvs command with root
54 my $cvs="cvs -f -d $CVSROOT";
55
56 # current revision in CVS
57 my $rev;
58
59 #
60 # sub to do logging and system calls
61 #
62 sub log_system($$) {
63 my ($cmd,$errmsg) = @_;
64 print STDERR "## $cmd\n";
65 system($cmd) == 0 || die "$errmsg: $!";
66 }
67
68 #
69 # sub to commit .svn rev file later
70 #
71 sub commit_svnrev {
72 my $rev = shift @_;
73 my $add_new = shift @_;
74
75 die "commit_svnrev needs revision" if (! defined($rev));
76
77 open(SVNREV,"> .svnrev") || die "can't open $TMPDIR/$CVSREP/.svnrev: $!";
78 print SVNREV $rev;
79 close(SVNREV);
80
81 my $path=".svnrev";
82
83 if ($add_new) {
84 system "$cvs add '$path'" || die "cvs add of $path failed: $!";
85 } else {
86 my $msg="subversion revision $rev commited to CVS";
87 print "$msg\n";
88 system "$cvs commit -m '$msg' '$path'" || die "cvs commit of $path failed: $!";
89 }
90 }
91
92 sub add_dir($$) {
93 my ($path,$msg) = @_;
94 print "# add_dir($path)\n";
95 die "add_dir($path) is not directory" unless (-d $path);
96
97 my $curr_dir;
98
99 foreach my $d (split(m#/#, $path)) {
100 $curr_dir .= ( $curr_dir ? '/' : '') . $d;
101
102 next if in_entries($curr_dir);
103 next if (-e "$curr_dir/CVS");
104
105 log_system("$cvs add '$curr_dir'", "cvs add of $curr_dir failed");
106 }
107 }
108
109 # ok, now do the checkout
110 eval {
111 cd_tmp;
112 log_system("$cvs -q checkout $CVSREP", "cvs checkout failed");
113 };
114
115 if ($@) {
116 print <<_NEW_REP_;
117
118 There is no CVS repository '$CVSREP' in your CVS. I will assume that
119 this is import of new module in your CVS and start from revision 0.
120
121 Press enter to continue importing new CVS repository or CTRL+C to abort.
122
123 _NEW_REP_
124
125 print "start import of new module [yes]: ";
126 my $in = <STDIN>;
127 cd_tmp;
128 mkdir($CVSREP) || die "can't create $CVSREP: $!";
129 cd_rep;
130
131 open(SVNREV,"> .svnrev") || die "can't open $CVSREP/.svnrev: $!";
132 print SVNREV "0";
133 close(SVNREV);
134
135 $rev = 0;
136
137 # create new module
138 cd_rep;
139 log_system("$cvs import -d -m 'new CVS module' $CVSREP svn r$rev", "import of new repository");
140 cd_tmp;
141 rmtree($CVSREP) || die "can't remove $CVSREP";
142 log_system("$cvs -q checkout $CVSREP", "cvs checkout failed");
143 cd_rep;
144
145 } else {
146 # import into existing module directory in CVS
147
148 cd_rep;
149 # check if svnrev exists
150 if (! -e ".svnrev") {
151 print <<_USAGE_;
152
153 Your CVS repository doesn't have .svnrev file!
154
155 This file is used to keep CVS repository and Subversion in sync, so
156 that only newer changes will be commited.
157
158 It's quote possible that this is first svn2cvs run for this repository.
159 If so, you will have to identify correct svn revision which
160 corresponds to current version of CVS repository that has just
161 been checkouted.
162
163 If you migrated your cvs repository to svn using cvs2svn, this will be
164 last Subversion revision. If this is initial run of conversion of
165 Subversion repository to CVS, correct revision is 0.
166
167 _USAGE_
168
169 print "svn revision corresponding to CVS [abort]: ";
170 my $in = <STDIN>;
171 chomp($in);
172 if ($in !~ /^\d+$/) {
173 print "Aborting: revision not a number\n";
174 exit 1;
175 } else {
176 $rev = $in;
177 commit_svnrev($rev,1); # create new
178 }
179 } else {
180 open(SVNREV,".svnrev") || die "can't open $TMPDIR/$CVSREP/.svnrev: $!";
181 $rev = <SVNREV>;
182 chomp($rev);
183 close(SVNREV);
184 }
185
186 print "Starting after revision $rev\n";
187 $rev++;
188 }
189
190
191 #
192 # FIXME!! HEAD should really be next verison and loop because this way we
193 # loose multiple edits of same file and corresponding messages. On the
194 # other hand, if you want to compress your traffic to CVS server and don't
195 # case much about accuracy and completnes of logs there, this might
196 # be good. YMMV
197 #
198 open(LOG, "svn log -r $rev:HEAD -v --xml $SVNROOT |") || die "svn log for repository $SVNROOT failed: $!";
199 my $log;
200 while(<LOG>) {
201 $log .= $_;
202 }
203 close(LOG);
204
205
206 my $xml;
207 eval {
208 $xml = XMLin($log, ForceArray => [ 'logentry', 'path' ]);
209 };
210
211
212 #=begin log_example
213 #
214 #------------------------------------------------------------------------
215 #r256 | dpavlin | 2004-03-09 13:18:17 +0100 (Tue, 09 Mar 2004) | 2 lines
216 #
217 #ported r254 from hidra branch
218 #
219 #=cut
220
221 my $fmt = "\n" . "-" x 79 . "\nr%5s| %8s | %s\n\n%s\n";
222
223 if (! $xml->{'logentry'}) {
224 print "no newer log entries in Subversion repostory. CVS is current\n";
225 exit 0;
226 }
227
228 # return all files in CVS/Entries
229 sub entries($) {
230 my $dir = shift;
231 die "entries expects directory argument!" unless -d $dir;
232 my @entries;
233 open(my $fh, "./$dir/CVS/Entries") || return 0;
234 while(<$fh>) {
235 if ( m{^D/([^/]+)}, ) {
236 my $sub_dir = $1;
237 warn "#### entries recurse into: $dir/$sub_dir";
238 push @entries, map { "$sub_dir/$_" } entries("$dir/$sub_dir");
239 push @entries, $sub_dir;
240 } elsif ( m{^/([^/]+)/} ) {
241 push @entries, $1;
242 } elsif ( ! m{^D$} ) {
243 die "can't decode entries line: $_";
244 }
245 }
246 close($fh);
247 warn "#### entries($dir) => ",join("|",@entries);
248 return @entries;
249 }
250
251 # check if file exists in CVS/Entries
252 sub in_entries($) {
253 my $path = shift;
254 if ($path =~ m,^(.*?/*)([^/]+)$,) {
255 my ($dir,$file) = ($1,$2);
256 if ($dir !~ m,/$, && $dir ne "") {
257 $dir .= "/";
258 }
259
260 open(my $fh, "./$dir/CVS/Entries") || return 0; #die "no entries file: $dir/CVS/Entries";
261 while(<$fh>) {
262 return 1 if (m{^/$file/});
263 }
264 close($fh);
265 return 0;
266 } else {
267 die "can't split '$path' to dir and file!";
268 }
269 }
270
271 cd_tmp;
272 cd_rep;
273
274 foreach my $e (@{$xml->{'logentry'}}) {
275 die "BUG: revision from .svnrev ($rev) greater than from subversion (".$e->{'revision'}.")" if ($rev > $e->{'revision'});
276 $rev = $e->{'revision'};
277 log_system("svn export --force -q -r $rev $SVNROOT $TMPDIR/$CVSREP", "svn export of revision $rev failed");
278
279 # deduce name of svn directory
280 my $SVNREP = "";
281 my $tmpsvn = $SVNROOT || die "BUG: SVNROOT empty!";
282 my $tmppath = $e->{'paths'}->{'path'}->[0]->{'content'} || die "BUG: tmppath empty!";
283 do {
284 if ($tmpsvn =~ s#(/[^/]+)/*$##) { # vim fix
285 $SVNREP = $1 . $SVNREP;
286 } elsif ($e->{'paths'}->{'path'}->[0]->{'copyfrom-path'}) {
287 print "NOTICE: copyfrom outside synced repository ignored - skipping\n";
288 next;
289 } else {
290 print "NOTICE: can't deduce svn dir from $SVNROOT - skipping\n";
291 next;
292 }
293 } until ($tmppath =~ m/^$SVNREP/);
294
295 print "NOTICE: using $SVNREP as directory for svn\n";
296
297 printf($fmt, $e->{'revision'}, $e->{'author'}, $e->{'date'}, $e->{'msg'});
298 my @commit;
299
300 my $msg = $e->{'msg'};
301 $msg =~ s/'/'\\''/g; # quote "
302
303 $msg = 'r' . $rev . ' ' . $e->{author} . ' | ' . $e->{date} . "\n" . $msg if $decorate_commit_message;
304
305 sub cvs_commit {
306 my $msg = shift || die "no msg?";
307 if ( ! @_ ) {
308 warn "commit ignored, no files\n";
309 return;
310 }
311 log_system("$cvs commit -m '$msg' '".join("' '",@_)."'", "cvs commit of ".join(",",@_)." failed");
312 }
313
314 foreach my $p (@{$e->{'paths'}->{'path'}}) {
315 my ($action,$path) = ($p->{'action'},$p->{'content'});
316
317 next if ($path =~ m#/\.svnrev$#);
318
319 print "svn2cvs: $action $path\n";
320
321 # prepare path and message
322 my $file = $path;
323 if ( $path !~ s#^\Q$SVNREP\E/*## ) {
324 print "NOTICE: skipping '$path' which isn't under repository root '$SVNREP'\n";
325 die unless $partial_import;
326 next;
327 }
328
329 if (! $path) {
330 print "NOTICE: skipped this operation. Probably trunk creation\n";
331 next;
332 }
333
334 my $msg = $e->{'msg'};
335 $msg =~ s/'/'\\''/g; # quote "
336
337 sub add_path {
338 my $path = shift || die "no path?";
339
340 if (-d $path) {
341 add_dir($path, $msg);
342 } elsif ($path =~ m,^(.+)/[^/]+$, && ! -e "$1/CVS/Root") {
343 my $dir = $1;
344 in_entries($dir) || add_dir($dir, $msg);
345 in_entries($path) || log_system("$cvs add '$path'", "cvs add of $path failed");
346 } else {
347 in_entries($path) || log_system("$cvs add '$path'", "cvs add of $path failed");
348 }
349 }
350
351 if ($action =~ /M/) {
352 if ( in_entries( $path ) ) {
353 print "svn2cvs: modify $path -- nop\n";
354 } else {
355 print "WARNING: modify $path which isn't in CVS, adding...\n";
356 add_path($path);
357 }
358 } elsif ($action =~ /A/) {
359 add_path($path);
360 } elsif ($action =~ /D/) {
361 if (-e $path) {
362 if ( -d $path ) {
363 warn "#### remove directory: $path";
364 my @sub_commit;
365 foreach my $f ( entries($path) ) {
366 $f = "$path/$f";
367 if ( -f $f ) {
368 unlink($f) || die "can't delete file $f: $!";
369 # } else {
370 # rmtree($f) || die "can't delete dir $f: $!";
371 }
372 log_system("$cvs delete '$f'", "cvs delete of file $f failed");
373 push @sub_commit, $f;
374 }
375 log_system("$cvs delete '$path'", "cvs delete of file $path failed");
376 cvs_commit($msg, @sub_commit, $path);
377 log_system("$cvs update -dP '$path'", "cvs update -dP $path failed");
378 undef $path;
379 } else {
380 warn "#### remove file: $path";
381 unlink($path) || die "can't delete $path: $!";
382 log_system("$cvs delete '$path'", "cvs delete of dir $path failed");
383 }
384 } else {
385 print "WARNING: $path is not present, skipping...\n";
386 undef $path;
387 }
388 } else {
389 print "WARNING: action $action not implemented on $path. Bug or missing feature of $0\n";
390 }
391
392 # save commits for later
393 push @commit, $path if ($path);
394
395 }
396
397 # now commit changes
398 cvs_commit($msg, @commit);
399
400 commit_svnrev($rev);
401 }
402
403 # cd out of $CVSREP before File::Temp::END is called
404 chdir("/tmp") || die "can't cd to /tmp: $!";
405
406 __END__
407
408 =pod
409
410 =head1 NAME
411
412 svn2cvs - save subversion commits to (read-only) cvs repository
413
414 =head1 SYNOPSIS
415
416 ./svn2cvs.pl SVN_URL CVSROOT CVSREPOSITORY
417
418 Usage example (used to self-host this script):
419
420 ./svn2cvs.pl file:///home/dpavlin/private/svn/svn2cvs/trunk/ \
421 :pserver:dpavlin@cvs.tigris.org:/cvs svn2cvs/src
422
423 =head1 DESCRIPTION
424
425 This script will allows you to commit changes made to Subversion repository to
426 (read-only) CVS repository manually or from Subversion's C<post-commit> hook.
427
428 It's using F<.svnrev> file (which will be created on first run) in
429 B<CVSROOT/CVSREPOSITORY> to store last Subversion revision which was
430 committed into CVS.
431
432 One run will do following things:
433
434 =over 4
435
436 =item *
437 checkout B<CVSREPOSITORY> from B<CVSROOT> to temporary directory
438
439 =item *
440 check if F<.svnrev> file exists and create it if it doesn't
441
442 =item *
443 loop through all revisions from current in B<CVSROOT/CVSREPOSITORY> (using
444 F<.svnrev>) up to B<HEAD> (current one)
445
446 =over 5
447
448 =item *
449 checkout next Subversion revision from B<SVN_URL> over CVS checkout
450 temporary directory
451
452 =item *
453 make modification (add and/or delete) done in that revision
454
455 =item *
456 commit modification (added, deleted or modified files/dirs) while
457 preserving original message from CVS
458
459 =item *
460 update F<.svnrev> to match current revision
461
462 =back
463
464 =item *
465 cleanup temporary directory
466
467 =back
468
469 If checkout fails for some reason (e.g. flaky ssh connection), you will
470 still have valid CVS repository, so all you have to do is run B<svn2cvs.pl>
471 again.
472
473 =head1 WARNINGS
474
475 "Cheap" copy operations in Subversion are not at all cheap in CVS. They will
476 create multiple copies of files in CVS repository!
477
478 This script assume that you want to sync your C<trunk> (or any other
479 directory for that matter) directory with CVS, not root of your subversion.
480 This might be considered bug, but since common practise is to have
481 directories C<trunk> and C<branches> in svn and source code in them, it's
482 not serious limitation.
483
484 =head1 RELATED PROJECTS
485
486 B<Subversion> L<http://subversion.tigris.org/> version control system that is a
487 compelling replacement for CVS in the open source community.
488
489 B<cvs2svn> L<http://cvs2svn.tigris.org/> converts a CVS repository to a
490 Subversion repository. It is designed for one-time conversions, not for
491 repeated synchronizations between CVS and Subversion.
492
493 =head1 CHANGES
494
495 Versions of this utility are actually Subversion repository revisions,
496 so they might not be in sequence.
497
498 =over 3
499
500 =item r10
501
502 First release available to public
503
504 =item r15
505
506 Addition of comprehensive documentation, fixes for quoting in commit
507 messages, and support for skipping changes which are not under current
508 Subversion checkout root (e.g. branches).
509
510 =item r18
511
512 Support for importing your svn into empty CVS repository (it will first
513 create module and than dump all revisions).
514 Group commit operations to save round-trips to CVS server.
515 Documentation improvements and other small fixes.
516
517 =item r20
518
519 Fixed path deduction (overlap between Subversion reporistory and CVS checkout).
520
521 =item r21
522
523 Use C<update -d> instead of checkout after import.
524 Added fixes by Paul Egan <paulegan@mail.com> for XMLin and fixing working
525 directory.
526
527 =item r22
528
529 Rewritten import from revision 0 to empty repository, better importing
530 of deep directory structures, initial support for recovery from partial
531 commit.
532
533 =back
534
535 =head1 AUTHOR
536
537 Dobrica Pavlinusic <dpavlin@rot13.org>
538
539 L<http://www.rot13.org/~dpavlin/>
540
541 =head1 LICENSE
542
543 This product is licensed under GNU Public License (GPL) v2 or later.
544
545 =cut
546

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