Add a remote helper to interact with mediawiki (fetch & push)
[git/git.git] / contrib / mw-to-git / git-remote-mediawiki
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428c995c
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1#! /usr/bin/perl
2
3# Copyright (C) 2011
4# Jérémie Nikaes <jeremie.nikaes@ensimag.imag.fr>
5# Arnaud Lacurie <arnaud.lacurie@ensimag.imag.fr>
6# Claire Fousse <claire.fousse@ensimag.imag.fr>
7# David Amouyal <david.amouyal@ensimag.imag.fr>
8# Matthieu Moy <matthieu.moy@grenoble-inp.fr>
9# License: GPL v2 or later
10
11# Gateway between Git and MediaWiki.
12# https://github.com/Bibzball/Git-Mediawiki/wiki
13#
14# Known limitations:
15#
16# - Only wiki pages are managed, no support for [[File:...]]
17# attachments.
18#
19# - Poor performance in the best case: it takes forever to check
20# whether we're up-to-date (on fetch or push) or to fetch a few
21# revisions from a large wiki, because we use exclusively a
22# page-based synchronization. We could switch to a wiki-wide
23# synchronization when the synchronization involves few revisions
24# but the wiki is large.
25#
26# - Git renames could be turned into MediaWiki renames (see TODO
27# below)
28#
29# - login/password support requires the user to write the password
30# cleartext in a file (see TODO below).
31#
32# - No way to import "one page, and all pages included in it"
33#
34# - Multiple remote MediaWikis have not been very well tested.
35
36use strict;
37use MediaWiki::API;
38use DateTime::Format::ISO8601;
39use encoding 'utf8';
40
41# use encoding 'utf8' doesn't change STDERROR
42# but we're going to output UTF-8 filenames to STDERR
43binmode STDERR, ":utf8";
44
45use URI::Escape;
46use warnings;
47
48# Mediawiki filenames can contain forward slashes. This variable decides by which pattern they should be replaced
49use constant SLASH_REPLACEMENT => "%2F";
50
51# It's not always possible to delete pages (may require some
52# priviledges). Deleted pages are replaced with this content.
53use constant DELETED_CONTENT => "[[Category:Deleted]]\n";
54
55# It's not possible to create empty pages. New empty files in Git are
56# sent with this content instead.
57use constant EMPTY_CONTENT => "<!-- empty page -->\n";
58
59# used to reflect file creation or deletion in diff.
60use constant NULL_SHA1 => "0000000000000000000000000000000000000000";
61
62my $remotename = $ARGV[0];
63my $url = $ARGV[1];
64
65# Accept both space-separated and multiple keys in config file.
66# Spaces should be written as _ anyway because we'll use chomp.
67my @tracked_pages = split(/[ \n]/, run_git("config --get-all remote.". $remotename .".pages"));
68chomp(@tracked_pages);
69
70# Just like @tracked_pages, but for MediaWiki categories.
71my @tracked_categories = split(/[ \n]/, run_git("config --get-all remote.". $remotename .".categories"));
72chomp(@tracked_categories);
73
74my $wiki_login = run_git("config --get remote.". $remotename .".mwLogin");
75# TODO: ideally, this should be able to read from keyboard, but we're
76# inside a remote helper, so our stdin is connect to git, not to a
77# terminal.
78my $wiki_passwd = run_git("config --get remote.". $remotename .".mwPassword");
79chomp($wiki_login);
80chomp($wiki_passwd);
81
82# Import only last revisions (both for clone and fetch)
83my $shallow_import = run_git("config --get --bool remote.". $remotename .".shallow");
84chomp($shallow_import);
85$shallow_import = ($shallow_import eq "true");
86
87my $wiki_name = $url;
88$wiki_name =~ s/[^\/]*:\/\///;
89
90# Commands parser
91my $entry;
92my @cmd;
93while (<STDIN>) {
94 chomp;
95 @cmd = split(/ /);
96 if (defined($cmd[0])) {
97 # Line not blank
98 if ($cmd[0] eq "capabilities") {
99 die("Too many arguments for capabilities") unless (!defined($cmd[1]));
100 mw_capabilities();
101 } elsif ($cmd[0] eq "list") {
102 die("Too many arguments for list") unless (!defined($cmd[2]));
103 mw_list($cmd[1]);
104 } elsif ($cmd[0] eq "import") {
105 die("Invalid arguments for import") unless ($cmd[1] ne "" && !defined($cmd[2]));
106 mw_import($cmd[1]);
107 } elsif ($cmd[0] eq "option") {
108 die("Too many arguments for option") unless ($cmd[1] ne "" && $cmd[2] ne "" && !defined($cmd[3]));
109 mw_option($cmd[1],$cmd[2]);
110 } elsif ($cmd[0] eq "push") {
111 mw_push($cmd[1]);
112 } else {
113 print STDERR "Unknown command. Aborting...\n";
114 last;
115 }
116 } else {
117 # blank line: we should terminate
118 last;
119 }
120
121 BEGIN { $| = 1 } # flush STDOUT, to make sure the previous
122 # command is fully processed.
123}
124
125########################## Functions ##############################
126
127# MediaWiki API instance, created lazily.
128my $mediawiki;
129
130sub mw_connect_maybe {
131 if ($mediawiki) {
132 return;
133 }
134 $mediawiki = MediaWiki::API->new;
135 $mediawiki->{config}->{api_url} = "$url/api.php";
136 if ($wiki_login) {
137 if (!$mediawiki->login({
138 lgname => $wiki_login,
139 lgpassword => $wiki_passwd,
140 })) {
141 print STDERR "Failed to log in mediawiki user \"$wiki_login\" on $url\n";
142 print STDERR "(error " .
143 $mediawiki->{error}->{code} . ': ' .
144 $mediawiki->{error}->{details} . ")\n";
145 exit 1;
146 } else {
147 print STDERR "Logged in with user \"$wiki_login\".\n";
148 }
149 }
150}
151
152sub get_mw_first_pages {
153 my $some_pages = shift;
154 my @some_pages = @{$some_pages};
155
156 my $pages = shift;
157
158 # pattern 'page1|page2|...' required by the API
159 my $titles = join('|', @some_pages);
160
161 my $mw_pages = $mediawiki->api({
162 action => 'query',
163 titles => $titles,
164 });
165 if (!defined($mw_pages)) {
166 print STDERR "fatal: could not query the list of wiki pages.\n";
167 print STDERR "fatal: '$url' does not appear to be a mediawiki\n";
168 print STDERR "fatal: make sure '$url/api.php' is a valid page.\n";
169 exit 1;
170 }
171 while (my ($id, $page) = each(%{$mw_pages->{query}->{pages}})) {
172 if ($id < 0) {
173 print STDERR "Warning: page $page->{title} not found on wiki\n";
174 } else {
175 $pages->{$page->{title}} = $page;
176 }
177 }
178}
179
180sub get_mw_pages {
181 mw_connect_maybe();
182
183 my %pages; # hash on page titles to avoid duplicates
184 my $user_defined;
185 if (@tracked_pages) {
186 $user_defined = 1;
187 # The user provided a list of pages titles, but we
188 # still need to query the API to get the page IDs.
189
190 my @some_pages = @tracked_pages;
191 while (@some_pages) {
192 my $last = 50;
193 if ($#some_pages < $last) {
194 $last = $#some_pages;
195 }
196 my @slice = @some_pages[0..$last];
197 get_mw_first_pages(\@slice, \%pages);
198 @some_pages = @some_pages[51..$#some_pages];
199 }
200 }
201 if (@tracked_categories) {
202 $user_defined = 1;
203 foreach my $category (@tracked_categories) {
204 if (index($category, ':') < 0) {
205 # Mediawiki requires the Category
206 # prefix, but let's not force the user
207 # to specify it.
208 $category = "Category:" . $category;
209 }
210 my $mw_pages = $mediawiki->list( {
211 action => 'query',
212 list => 'categorymembers',
213 cmtitle => $category,
214 cmlimit => 'max' } )
215 || die $mediawiki->{error}->{code} . ': ' . $mediawiki->{error}->{details};
216 foreach my $page (@{$mw_pages}) {
217 $pages{$page->{title}} = $page;
218 }
219 }
220 }
221 if (!$user_defined) {
222 # No user-provided list, get the list of pages from
223 # the API.
224 my $mw_pages = $mediawiki->list({
225 action => 'query',
226 list => 'allpages',
227 aplimit => 500,
228 });
229 if (!defined($mw_pages)) {
230 print STDERR "fatal: could not get the list of wiki pages.\n";
231 print STDERR "fatal: '$url' does not appear to be a mediawiki\n";
232 print STDERR "fatal: make sure '$url/api.php' is a valid page.\n";
233 exit 1;
234 }
235 foreach my $page (@{$mw_pages}) {
236 $pages{$page->{title}} = $page;
237 }
238 }
239 return values(%pages);
240}
241
242sub run_git {
243 open(my $git, "-|:encoding(UTF-8)", "git " . $_[0]);
244 my $res = do { local $/; <$git> };
245 close($git);
246
247 return $res;
248}
249
250
251sub get_last_local_revision {
252 # Get note regarding last mediawiki revision
253 my $note = run_git("notes --ref=$remotename/mediawiki show refs/mediawiki/$remotename/master 2>/dev/null");
254 my @note_info = split(/ /, $note);
255
256 my $lastrevision_number;
257 if (!(defined($note_info[0]) && $note_info[0] eq "mediawiki_revision:")) {
258 print STDERR "No previous mediawiki revision found";
259 $lastrevision_number = 0;
260 } else {
261 # Notes are formatted : mediawiki_revision: #number
262 $lastrevision_number = $note_info[1];
263 chomp($lastrevision_number);
264 print STDERR "Last local mediawiki revision found is $lastrevision_number";
265 }
266 return $lastrevision_number;
267}
268
269sub get_last_remote_revision {
270 mw_connect_maybe();
271
272 my @pages = get_mw_pages();
273
274 my $max_rev_num = 0;
275
276 foreach my $page (@pages) {
277 my $id = $page->{pageid};
278
279 my $query = {
280 action => 'query',
281 prop => 'revisions',
282 rvprop => 'ids',
283 pageids => $id,
284 };
285
286 my $result = $mediawiki->api($query);
287
288 my $lastrev = pop(@{$result->{query}->{pages}->{$id}->{revisions}});
289
290 $max_rev_num = ($lastrev->{revid} > $max_rev_num ? $lastrev->{revid} : $max_rev_num);
291 }
292
293 print STDERR "Last remote revision found is $max_rev_num.\n";
294 return $max_rev_num;
295}
296
297# Clean content before sending it to MediaWiki
298sub mediawiki_clean {
299 my $string = shift;
300 my $page_created = shift;
301 # Mediawiki does not allow blank space at the end of a page and ends with a single \n.
302 # This function right trims a string and adds a \n at the end to follow this rule
303 $string =~ s/\s+$//;
304 if ($string eq "" && $page_created) {
305 # Creating empty pages is forbidden.
306 $string = EMPTY_CONTENT;
307 }
308 return $string."\n";
309}
310
311# Filter applied on MediaWiki data before adding them to Git
312sub mediawiki_smudge {
313 my $string = shift;
314 if ($string eq EMPTY_CONTENT) {
315 $string = "";
316 }
317 # This \n is important. This is due to mediawiki's way to handle end of files.
318 return $string."\n";
319}
320
321sub mediawiki_clean_filename {
322 my $filename = shift;
323 $filename =~ s/@{[SLASH_REPLACEMENT]}/\//g;
324 # [, ], |, {, and } are forbidden by MediaWiki, even URL-encoded.
325 # Do a variant of URL-encoding, i.e. looks like URL-encoding,
326 # but with _ added to prevent MediaWiki from thinking this is
327 # an actual special character.
328 $filename =~ s/[\[\]\{\}\|]/sprintf("_%%_%x", ord($&))/ge;
329 # If we use the uri escape before
330 # we should unescape here, before anything
331
332 return $filename;
333}
334
335sub mediawiki_smudge_filename {
336 my $filename = shift;
337 $filename =~ s/\//@{[SLASH_REPLACEMENT]}/g;
338 $filename =~ s/ /_/g;
339 # Decode forbidden characters encoded in mediawiki_clean_filename
340 $filename =~ s/_%_([0-9a-fA-F][0-9a-fA-F])/sprintf("%c", hex($1))/ge;
341 return $filename;
342}
343
344sub literal_data {
345 my ($content) = @_;
346 print STDOUT "data ", bytes::length($content), "\n", $content;
347}
348
349sub mw_capabilities {
350 # Revisions are imported to the private namespace
351 # refs/mediawiki/$remotename/ by the helper and fetched into
352 # refs/remotes/$remotename later by fetch.
353 print STDOUT "refspec refs/heads/*:refs/mediawiki/$remotename/*\n";
354 print STDOUT "import\n";
355 print STDOUT "list\n";
356 print STDOUT "push\n";
357 print STDOUT "\n";
358}
359
360sub mw_list {
361 # MediaWiki do not have branches, we consider one branch arbitrarily
362 # called master, and HEAD pointing to it.
363 print STDOUT "? refs/heads/master\n";
364 print STDOUT "\@refs/heads/master HEAD\n";
365 print STDOUT "\n";
366}
367
368sub mw_option {
369 print STDERR "remote-helper command 'option $_[0]' not yet implemented\n";
370 print STDOUT "unsupported\n";
371}
372
373sub fetch_mw_revisions_for_page {
374 my $page = shift;
375 my $id = shift;
376 my $fetch_from = shift;
377 my @page_revs = ();
378 my $query = {
379 action => 'query',
380 prop => 'revisions',
381 rvprop => 'ids',
382 rvdir => 'newer',
383 rvstartid => $fetch_from,
384 rvlimit => 500,
385 pageids => $id,
386 };
387
388 my $revnum = 0;
389 # Get 500 revisions at a time due to the mediawiki api limit
390 while (1) {
391 my $result = $mediawiki->api($query);
392
393 # Parse each of those 500 revisions
394 foreach my $revision (@{$result->{query}->{pages}->{$id}->{revisions}}) {
395 my $page_rev_ids;
396 $page_rev_ids->{pageid} = $page->{pageid};
397 $page_rev_ids->{revid} = $revision->{revid};
398 push(@page_revs, $page_rev_ids);
399 $revnum++;
400 }
401 last unless $result->{'query-continue'};
402 $query->{rvstartid} = $result->{'query-continue'}->{revisions}->{rvstartid};
403 }
404 if ($shallow_import && @page_revs) {
405 print STDERR " Found 1 revision (shallow import).\n";
406 @page_revs = sort {$b->{revid} <=> $a->{revid}} (@page_revs);
407 return $page_revs[0];
408 }
409 print STDERR " Found ", $revnum, " revision(s).\n";
410 return @page_revs;
411}
412
413sub fetch_mw_revisions {
414 my $pages = shift; my @pages = @{$pages};
415 my $fetch_from = shift;
416
417 my @revisions = ();
418 my $n = 1;
419 foreach my $page (@pages) {
420 my $id = $page->{pageid};
421
422 print STDERR "page $n/", scalar(@pages), ": ". $page->{title} ."\n";
423 $n++;
424 my @page_revs = fetch_mw_revisions_for_page($page, $id, $fetch_from);
425 @revisions = (@page_revs, @revisions);
426 }
427
428 return ($n, @revisions);
429}
430
431sub import_file_revision {
432 my $commit = shift;
433 my %commit = %{$commit};
434 my $full_import = shift;
435 my $n = shift;
436
437 my $title = $commit{title};
438 my $comment = $commit{comment};
439 my $content = $commit{content};
440 my $author = $commit{author};
441 my $date = $commit{date};
442
443 print STDOUT "commit refs/mediawiki/$remotename/master\n";
444 print STDOUT "mark :$n\n";
445 print STDOUT "committer $author <$author\@$wiki_name> ", $date->epoch, " +0000\n";
446 literal_data($comment);
447
448 # If it's not a clone, we need to know where to start from
449 if (!$full_import && $n == 1) {
450 print STDOUT "from refs/mediawiki/$remotename/master^0\n";
451 }
452 if ($content ne DELETED_CONTENT) {
453 print STDOUT "M 644 inline $title.mw\n";
454 literal_data($content);
455 print STDOUT "\n\n";
456 } else {
457 print STDOUT "D $title.mw\n";
458 }
459
460 # mediawiki revision number in the git note
461 if ($full_import && $n == 1) {
462 print STDOUT "reset refs/notes/$remotename/mediawiki\n";
463 }
464 print STDOUT "commit refs/notes/$remotename/mediawiki\n";
465 print STDOUT "committer $author <$author\@$wiki_name> ", $date->epoch, " +0000\n";
466 literal_data("Note added by git-mediawiki during import");
467 if (!$full_import && $n == 1) {
468 print STDOUT "from refs/notes/$remotename/mediawiki^0\n";
469 }
470 print STDOUT "N inline :$n\n";
471 literal_data("mediawiki_revision: " . $commit{mw_revision});
472 print STDOUT "\n\n";
473}
474
475# parse a sequence of
476# <cmd> <arg1>
477# <cmd> <arg2>
478# \n
479# (like batch sequence of import and sequence of push statements)
480sub get_more_refs {
481 my $cmd = shift;
482 my @refs;
483 while (1) {
484 my $line = <STDIN>;
485 if ($line =~ m/^$cmd (.*)$/) {
486 push(@refs, $1);
487 } elsif ($line eq "\n") {
488 return @refs;
489 } else {
490 die("Invalid command in a '$cmd' batch: ". $_);
491 }
492 }
493}
494
495sub mw_import {
496 # multiple import commands can follow each other.
497 my @refs = (shift, get_more_refs("import"));
498 foreach my $ref (@refs) {
499 mw_import_ref($ref);
500 }
501 print STDOUT "done\n";
502}
503
504sub mw_import_ref {
505 my $ref = shift;
506 # The remote helper will call "import HEAD" and
507 # "import refs/heads/master".
508 # Since HEAD is a symbolic ref to master (by convention,
509 # followed by the output of the command "list" that we gave),
510 # we don't need to do anything in this case.
511 if ($ref eq "HEAD") {
512 return;
513 }
514
515 mw_connect_maybe();
516
517 my @pages = get_mw_pages();
518
519 print STDERR "Searching revisions...\n";
520 my $last_local = get_last_local_revision();
521 my $fetch_from = $last_local + 1;
522 if ($fetch_from == 1) {
523 print STDERR ", fetching from beginning.\n";
524 } else {
525 print STDERR ", fetching from here.\n";
526 }
527 my ($n, @revisions) = fetch_mw_revisions(\@pages, $fetch_from);
528
529 # Creation of the fast-import stream
530 print STDERR "Fetching & writing export data...\n";
531
532 $n = 0;
533 my $last_timestamp = 0; # Placeholer in case $rev->timestamp is undefined
534
535 foreach my $pagerevid (sort {$a->{revid} <=> $b->{revid}} @revisions) {
536 # fetch the content of the pages
537 my $query = {
538 action => 'query',
539 prop => 'revisions',
540 rvprop => 'content|timestamp|comment|user|ids',
541 revids => $pagerevid->{revid},
542 };
543
544 my $result = $mediawiki->api($query);
545
546 my $rev = pop(@{$result->{query}->{pages}->{$pagerevid->{pageid}}->{revisions}});
547
548 $n++;
549
550 my %commit;
551 $commit{author} = $rev->{user} || 'Anonymous';
552 $commit{comment} = $rev->{comment} || '*Empty MediaWiki Message*';
553 $commit{title} = mediawiki_smudge_filename(
554 $result->{query}->{pages}->{$pagerevid->{pageid}}->{title}
555 );
556 $commit{mw_revision} = $pagerevid->{revid};
557 $commit{content} = mediawiki_smudge($rev->{'*'});
558
559 if (!defined($rev->{timestamp})) {
560 $last_timestamp++;
561 } else {
562 $last_timestamp = $rev->{timestamp};
563 }
564 $commit{date} = DateTime::Format::ISO8601->parse_datetime($last_timestamp);
565
566 print STDERR "$n/", scalar(@revisions), ": Revision #$pagerevid->{revid} of $commit{title}\n";
567
568 import_file_revision(\%commit, ($fetch_from == 1), $n);
569 }
570
571 if ($fetch_from == 1 && $n == 0) {
572 print STDERR "You appear to have cloned an empty MediaWiki.\n";
573 # Something has to be done remote-helper side. If nothing is done, an error is
574 # thrown saying that HEAD is refering to unknown object 0000000000000000000
575 # and the clone fails.
576 }
577}
578
579sub error_non_fast_forward {
580 # Native git-push would show this after the summary.
581 # We can't ask it to display it cleanly, so print it
582 # ourselves before.
583 print STDERR "To prevent you from losing history, non-fast-forward updates were rejected\n";
584 print STDERR "Merge the remote changes (e.g. 'git pull') before pushing again. See the\n";
585 print STDERR "'Note about fast-forwards' section of 'git push --help' for details.\n";
586
587 print STDOUT "error $_[0] \"non-fast-forward\"\n";
588 return 0;
589}
590
591sub mw_push_file {
592 my $diff_info = shift;
593 # $diff_info contains a string in this format:
594 # 100644 100644 <sha1_of_blob_before_commit> <sha1_of_blob_now> <status>
595 my @diff_info_split = split(/[ \t]/, $diff_info);
596
597 # Filename, including .mw extension
598 my $complete_file_name = shift;
599 # Commit message
600 my $summary = shift;
601
602 my $new_sha1 = $diff_info_split[3];
603 my $old_sha1 = $diff_info_split[2];
604 my $page_created = ($old_sha1 eq NULL_SHA1);
605 my $page_deleted = ($new_sha1 eq NULL_SHA1);
606 $complete_file_name = mediawiki_clean_filename($complete_file_name);
607
608 if (substr($complete_file_name,-3) eq ".mw") {
609 my $title = substr($complete_file_name,0,-3);
610
611 my $file_content;
612 if ($page_deleted) {
613 # Deleting a page usually requires
614 # special priviledges. A common
615 # convention is to replace the page
616 # with this content instead:
617 $file_content = DELETED_CONTENT;
618 } else {
619 $file_content = run_git("cat-file blob $new_sha1");
620 }
621
622 mw_connect_maybe();
623
624 my $result = $mediawiki->edit( {
625 action => 'edit',
626 summary => $summary,
627 title => $title,
628 text => mediawiki_clean($file_content, $page_created),
629 }, {
630 skip_encoding => 1 # Helps with names with accentuated characters
631 }) || die 'Fatal: Error ' .
632 $mediawiki->{error}->{code} .
633 ' from mediwiki: ' . $mediawiki->{error}->{details};
634 print STDERR "Pushed file : $new_sha1 - $title\n";
635 } else {
636 print STDERR "$complete_file_name not a mediawiki file (Not pushable on this version of git-remote-mediawiki).\n"
637 }
638}
639
640sub mw_push {
641 # multiple push statements can follow each other
642 my @refsspecs = (shift, get_more_refs("push"));
643 my %status;
644 my $pushed;
645 for my $refspec (@refsspecs) {
646 my ($force, $local, $remote) = $refspec =~ /^(\+)?([^:]*):([^:]*)$/
647 or die("Invalid refspec for push. Expected <src>:<dst> or +<src>:<dst>");
648 if ($force) {
649 print STDERR "Warning: forced push not allowed on a MediaWiki.\n";
650 }
651 if ($local eq "") {
652 print STDERR "Cannot delete remote branch on a MediaWiki\n";
653 print STDOUT "error $remote cannot delete\n";
654 next;
655 }
656 if ($remote ne "refs/heads/master") {
657 print STDERR "Only push to the branch 'master' is supported on a MediaWiki\n";
658 print STDOUT "error $remote only master allowed\n";
659 next;
660 }
661 if (mw_push_revision($local, $remote)) {
662 $pushed = 1;
663 }
664 }
665
666 # Notify Git that the push is done
667 print STDOUT "\n";
668
669 if ($pushed) {
670 print STDERR "Just pushed some revisions to MediaWiki.\n";
671 print STDERR "The pushed revisions now have to be re-imported, and your current branch\n";
672 print STDERR "needs to be updated with these re-imported commits. You can do this with\n";
673 print STDERR "\n";
674 print STDERR " git pull --rebase\n";
675 print STDERR "\n";
676 }
677}
678
679sub mw_push_revision {
680 my $local = shift;
681 my $remote = shift; # actually, this has to be "refs/heads/master" at this point.
682 my $last_local_revid = get_last_local_revision();
683 print STDERR ".\n"; # Finish sentence started by get_last_local_revision()
684 my $last_remote_revid = get_last_remote_revision();
685
686 # Get sha1 of commit pointed by local HEAD
687 my $HEAD_sha1 = run_git("rev-parse $local 2>/dev/null"); chomp($HEAD_sha1);
688 # Get sha1 of commit pointed by remotes/$remotename/master
689 my $remoteorigin_sha1 = run_git("rev-parse refs/remotes/$remotename/master 2>/dev/null");
690 chomp($remoteorigin_sha1);
691
692 if ($last_local_revid > 0 &&
693 $last_local_revid < $last_remote_revid) {
694 return error_non_fast_forward($remote);
695 }
696
697 if ($HEAD_sha1 eq $remoteorigin_sha1) {
698 # nothing to push
699 return 0;
700 }
701
702 # Get every commit in between HEAD and refs/remotes/origin/master,
703 # including HEAD and refs/remotes/origin/master
704 my @commit_pairs = ();
705 if ($last_local_revid > 0) {
706 my $parsed_sha1 = $remoteorigin_sha1;
707 # Find a path from last MediaWiki commit to pushed commit
708 while ($parsed_sha1 ne $HEAD_sha1) {
709 my @commit_info = grep(/^$parsed_sha1/, split(/\n/, run_git("rev-list --children $local")));
710 if (!@commit_info) {
711 return error_non_fast_forward($remote);
712 }
713 my @commit_info_split = split(/ |\n/, $commit_info[0]);
714 # $commit_info_split[1] is the sha1 of the commit to export
715 # $commit_info_split[0] is the sha1 of its direct child
716 push(@commit_pairs, \@commit_info_split);
717 $parsed_sha1 = $commit_info_split[1];
718 }
719 } else {
720 # No remote mediawiki revision. Export the whole
721 # history (linearized with --first-parent)
722 print STDERR "Warning: no common ancestor, pushing complete history\n";
723 my $history = run_git("rev-list --first-parent --children $local");
724 my @history = split('\n', $history);
725 @history = @history[1..$#history];
726 foreach my $line (reverse @history) {
727 my @commit_info_split = split(/ |\n/, $line);
728 push(@commit_pairs, \@commit_info_split);
729 }
730 }
731
732 foreach my $commit_info_split (@commit_pairs) {
733 my $sha1_child = @{$commit_info_split}[0];
734 my $sha1_commit = @{$commit_info_split}[1];
735 my $diff_infos = run_git("diff-tree -r --raw -z $sha1_child $sha1_commit");
736 # TODO: we could detect rename, and encode them with a #redirect on the wiki.
737 # TODO: for now, it's just a delete+add
738 my @diff_info_list = split(/\0/, $diff_infos);
739 # Keep the first line of the commit message as mediawiki comment for the revision
740 my $commit_msg = (split(/\n/, run_git("show --pretty=format:\"%s\" $sha1_commit")))[0];
741 chomp($commit_msg);
742 # Push every blob
743 while (@diff_info_list) {
744 # git diff-tree -z gives an output like
745 # <metadata>\0<filename1>\0
746 # <metadata>\0<filename2>\0
747 # and we've split on \0.
748 my $info = shift(@diff_info_list);
749 my $file = shift(@diff_info_list);
750 mw_push_file($info, $file, $commit_msg);
751 }
752 }
753
754 print STDOUT "ok $remote\n";
755 return 1;
756}