git-remote-mediawiki: allow push to set MediaWiki metadata
[git/git.git] / contrib / mw-to-git / git-remote-mediawiki
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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
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87# Dumb push: don't update notes and mediawiki ref to reflect the last push.
88#
89# Configurable with mediawiki.dumbPush, or per-remote with
90# remote.<remotename>.dumbPush.
91#
92# This means the user will have to re-import the just-pushed
93# revisions. On the other hand, this means that the Git revisions
94# corresponding to MediaWiki revisions are all imported from the wiki,
95# regardless of whether they were initially created in Git or from the
96# web interface, hence all users will get the same history (i.e. if
97# the push from Git to MediaWiki loses some information, everybody
98# will get the history with information lost). If the import is
99# deterministic, this means everybody gets the same sha1 for each
100# MediaWiki revision.
101my $dumb_push = run_git("config --get --bool remote.$remotename.dumbPush");
102unless ($dumb_push) {
103 $dumb_push = run_git("config --get --bool mediawiki.dumbPush");
104}
105chomp($dumb_push);
106$dumb_push = ($dumb_push eq "true");
107
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108my $wiki_name = $url;
109$wiki_name =~ s/[^\/]*:\/\///;
110
111# Commands parser
112my $entry;
113my @cmd;
114while (<STDIN>) {
115 chomp;
116 @cmd = split(/ /);
117 if (defined($cmd[0])) {
118 # Line not blank
119 if ($cmd[0] eq "capabilities") {
120 die("Too many arguments for capabilities") unless (!defined($cmd[1]));
121 mw_capabilities();
122 } elsif ($cmd[0] eq "list") {
123 die("Too many arguments for list") unless (!defined($cmd[2]));
124 mw_list($cmd[1]);
125 } elsif ($cmd[0] eq "import") {
126 die("Invalid arguments for import") unless ($cmd[1] ne "" && !defined($cmd[2]));
127 mw_import($cmd[1]);
128 } elsif ($cmd[0] eq "option") {
129 die("Too many arguments for option") unless ($cmd[1] ne "" && $cmd[2] ne "" && !defined($cmd[3]));
130 mw_option($cmd[1],$cmd[2]);
131 } elsif ($cmd[0] eq "push") {
132 mw_push($cmd[1]);
133 } else {
134 print STDERR "Unknown command. Aborting...\n";
135 last;
136 }
137 } else {
138 # blank line: we should terminate
139 last;
140 }
141
142 BEGIN { $| = 1 } # flush STDOUT, to make sure the previous
143 # command is fully processed.
144}
145
146########################## Functions ##############################
147
148# MediaWiki API instance, created lazily.
149my $mediawiki;
150
151sub mw_connect_maybe {
152 if ($mediawiki) {
153 return;
154 }
155 $mediawiki = MediaWiki::API->new;
156 $mediawiki->{config}->{api_url} = "$url/api.php";
157 if ($wiki_login) {
158 if (!$mediawiki->login({
159 lgname => $wiki_login,
160 lgpassword => $wiki_passwd,
161 })) {
162 print STDERR "Failed to log in mediawiki user \"$wiki_login\" on $url\n";
163 print STDERR "(error " .
164 $mediawiki->{error}->{code} . ': ' .
165 $mediawiki->{error}->{details} . ")\n";
166 exit 1;
167 } else {
168 print STDERR "Logged in with user \"$wiki_login\".\n";
169 }
170 }
171}
172
173sub get_mw_first_pages {
174 my $some_pages = shift;
175 my @some_pages = @{$some_pages};
176
177 my $pages = shift;
178
179 # pattern 'page1|page2|...' required by the API
180 my $titles = join('|', @some_pages);
181
182 my $mw_pages = $mediawiki->api({
183 action => 'query',
184 titles => $titles,
185 });
186 if (!defined($mw_pages)) {
187 print STDERR "fatal: could not query the list of wiki pages.\n";
188 print STDERR "fatal: '$url' does not appear to be a mediawiki\n";
189 print STDERR "fatal: make sure '$url/api.php' is a valid page.\n";
190 exit 1;
191 }
192 while (my ($id, $page) = each(%{$mw_pages->{query}->{pages}})) {
193 if ($id < 0) {
194 print STDERR "Warning: page $page->{title} not found on wiki\n";
195 } else {
196 $pages->{$page->{title}} = $page;
197 }
198 }
199}
200
201sub get_mw_pages {
202 mw_connect_maybe();
203
204 my %pages; # hash on page titles to avoid duplicates
205 my $user_defined;
206 if (@tracked_pages) {
207 $user_defined = 1;
208 # The user provided a list of pages titles, but we
209 # still need to query the API to get the page IDs.
210
211 my @some_pages = @tracked_pages;
212 while (@some_pages) {
213 my $last = 50;
214 if ($#some_pages < $last) {
215 $last = $#some_pages;
216 }
217 my @slice = @some_pages[0..$last];
218 get_mw_first_pages(\@slice, \%pages);
219 @some_pages = @some_pages[51..$#some_pages];
220 }
221 }
222 if (@tracked_categories) {
223 $user_defined = 1;
224 foreach my $category (@tracked_categories) {
225 if (index($category, ':') < 0) {
226 # Mediawiki requires the Category
227 # prefix, but let's not force the user
228 # to specify it.
229 $category = "Category:" . $category;
230 }
231 my $mw_pages = $mediawiki->list( {
232 action => 'query',
233 list => 'categorymembers',
234 cmtitle => $category,
235 cmlimit => 'max' } )
236 || die $mediawiki->{error}->{code} . ': ' . $mediawiki->{error}->{details};
237 foreach my $page (@{$mw_pages}) {
238 $pages{$page->{title}} = $page;
239 }
240 }
241 }
242 if (!$user_defined) {
243 # No user-provided list, get the list of pages from
244 # the API.
245 my $mw_pages = $mediawiki->list({
246 action => 'query',
247 list => 'allpages',
248 aplimit => 500,
249 });
250 if (!defined($mw_pages)) {
251 print STDERR "fatal: could not get the list of wiki pages.\n";
252 print STDERR "fatal: '$url' does not appear to be a mediawiki\n";
253 print STDERR "fatal: make sure '$url/api.php' is a valid page.\n";
254 exit 1;
255 }
256 foreach my $page (@{$mw_pages}) {
257 $pages{$page->{title}} = $page;
258 }
259 }
260 return values(%pages);
261}
262
263sub run_git {
264 open(my $git, "-|:encoding(UTF-8)", "git " . $_[0]);
265 my $res = do { local $/; <$git> };
266 close($git);
267
268 return $res;
269}
270
271
272sub get_last_local_revision {
273 # Get note regarding last mediawiki revision
274 my $note = run_git("notes --ref=$remotename/mediawiki show refs/mediawiki/$remotename/master 2>/dev/null");
275 my @note_info = split(/ /, $note);
276
277 my $lastrevision_number;
278 if (!(defined($note_info[0]) && $note_info[0] eq "mediawiki_revision:")) {
279 print STDERR "No previous mediawiki revision found";
280 $lastrevision_number = 0;
281 } else {
282 # Notes are formatted : mediawiki_revision: #number
283 $lastrevision_number = $note_info[1];
284 chomp($lastrevision_number);
285 print STDERR "Last local mediawiki revision found is $lastrevision_number";
286 }
287 return $lastrevision_number;
288}
289
290sub get_last_remote_revision {
291 mw_connect_maybe();
292
293 my @pages = get_mw_pages();
294
295 my $max_rev_num = 0;
296
297 foreach my $page (@pages) {
298 my $id = $page->{pageid};
299
300 my $query = {
301 action => 'query',
302 prop => 'revisions',
303 rvprop => 'ids',
304 pageids => $id,
305 };
306
307 my $result = $mediawiki->api($query);
308
309 my $lastrev = pop(@{$result->{query}->{pages}->{$id}->{revisions}});
310
311 $max_rev_num = ($lastrev->{revid} > $max_rev_num ? $lastrev->{revid} : $max_rev_num);
312 }
313
314 print STDERR "Last remote revision found is $max_rev_num.\n";
315 return $max_rev_num;
316}
317
318# Clean content before sending it to MediaWiki
319sub mediawiki_clean {
320 my $string = shift;
321 my $page_created = shift;
322 # Mediawiki does not allow blank space at the end of a page and ends with a single \n.
323 # This function right trims a string and adds a \n at the end to follow this rule
324 $string =~ s/\s+$//;
325 if ($string eq "" && $page_created) {
326 # Creating empty pages is forbidden.
327 $string = EMPTY_CONTENT;
328 }
329 return $string."\n";
330}
331
332# Filter applied on MediaWiki data before adding them to Git
333sub mediawiki_smudge {
334 my $string = shift;
335 if ($string eq EMPTY_CONTENT) {
336 $string = "";
337 }
338 # This \n is important. This is due to mediawiki's way to handle end of files.
339 return $string."\n";
340}
341
342sub mediawiki_clean_filename {
343 my $filename = shift;
344 $filename =~ s/@{[SLASH_REPLACEMENT]}/\//g;
345 # [, ], |, {, and } are forbidden by MediaWiki, even URL-encoded.
346 # Do a variant of URL-encoding, i.e. looks like URL-encoding,
347 # but with _ added to prevent MediaWiki from thinking this is
348 # an actual special character.
349 $filename =~ s/[\[\]\{\}\|]/sprintf("_%%_%x", ord($&))/ge;
350 # If we use the uri escape before
351 # we should unescape here, before anything
352
353 return $filename;
354}
355
356sub mediawiki_smudge_filename {
357 my $filename = shift;
358 $filename =~ s/\//@{[SLASH_REPLACEMENT]}/g;
359 $filename =~ s/ /_/g;
360 # Decode forbidden characters encoded in mediawiki_clean_filename
361 $filename =~ s/_%_([0-9a-fA-F][0-9a-fA-F])/sprintf("%c", hex($1))/ge;
362 return $filename;
363}
364
365sub literal_data {
366 my ($content) = @_;
367 print STDOUT "data ", bytes::length($content), "\n", $content;
368}
369
370sub mw_capabilities {
371 # Revisions are imported to the private namespace
372 # refs/mediawiki/$remotename/ by the helper and fetched into
373 # refs/remotes/$remotename later by fetch.
374 print STDOUT "refspec refs/heads/*:refs/mediawiki/$remotename/*\n";
375 print STDOUT "import\n";
376 print STDOUT "list\n";
377 print STDOUT "push\n";
378 print STDOUT "\n";
379}
380
381sub mw_list {
382 # MediaWiki do not have branches, we consider one branch arbitrarily
383 # called master, and HEAD pointing to it.
384 print STDOUT "? refs/heads/master\n";
385 print STDOUT "\@refs/heads/master HEAD\n";
386 print STDOUT "\n";
387}
388
389sub mw_option {
390 print STDERR "remote-helper command 'option $_[0]' not yet implemented\n";
391 print STDOUT "unsupported\n";
392}
393
394sub fetch_mw_revisions_for_page {
395 my $page = shift;
396 my $id = shift;
397 my $fetch_from = shift;
398 my @page_revs = ();
399 my $query = {
400 action => 'query',
401 prop => 'revisions',
402 rvprop => 'ids',
403 rvdir => 'newer',
404 rvstartid => $fetch_from,
405 rvlimit => 500,
406 pageids => $id,
407 };
408
409 my $revnum = 0;
410 # Get 500 revisions at a time due to the mediawiki api limit
411 while (1) {
412 my $result = $mediawiki->api($query);
413
414 # Parse each of those 500 revisions
415 foreach my $revision (@{$result->{query}->{pages}->{$id}->{revisions}}) {
416 my $page_rev_ids;
417 $page_rev_ids->{pageid} = $page->{pageid};
418 $page_rev_ids->{revid} = $revision->{revid};
419 push(@page_revs, $page_rev_ids);
420 $revnum++;
421 }
422 last unless $result->{'query-continue'};
423 $query->{rvstartid} = $result->{'query-continue'}->{revisions}->{rvstartid};
424 }
425 if ($shallow_import && @page_revs) {
426 print STDERR " Found 1 revision (shallow import).\n";
427 @page_revs = sort {$b->{revid} <=> $a->{revid}} (@page_revs);
428 return $page_revs[0];
429 }
430 print STDERR " Found ", $revnum, " revision(s).\n";
431 return @page_revs;
432}
433
434sub fetch_mw_revisions {
435 my $pages = shift; my @pages = @{$pages};
436 my $fetch_from = shift;
437
438 my @revisions = ();
439 my $n = 1;
440 foreach my $page (@pages) {
441 my $id = $page->{pageid};
442
443 print STDERR "page $n/", scalar(@pages), ": ". $page->{title} ."\n";
444 $n++;
445 my @page_revs = fetch_mw_revisions_for_page($page, $id, $fetch_from);
446 @revisions = (@page_revs, @revisions);
447 }
448
449 return ($n, @revisions);
450}
451
452sub import_file_revision {
453 my $commit = shift;
454 my %commit = %{$commit};
455 my $full_import = shift;
456 my $n = shift;
457
458 my $title = $commit{title};
459 my $comment = $commit{comment};
460 my $content = $commit{content};
461 my $author = $commit{author};
462 my $date = $commit{date};
463
464 print STDOUT "commit refs/mediawiki/$remotename/master\n";
465 print STDOUT "mark :$n\n";
466 print STDOUT "committer $author <$author\@$wiki_name> ", $date->epoch, " +0000\n";
467 literal_data($comment);
468
469 # If it's not a clone, we need to know where to start from
470 if (!$full_import && $n == 1) {
471 print STDOUT "from refs/mediawiki/$remotename/master^0\n";
472 }
473 if ($content ne DELETED_CONTENT) {
474 print STDOUT "M 644 inline $title.mw\n";
475 literal_data($content);
476 print STDOUT "\n\n";
477 } else {
478 print STDOUT "D $title.mw\n";
479 }
480
481 # mediawiki revision number in the git note
482 if ($full_import && $n == 1) {
483 print STDOUT "reset refs/notes/$remotename/mediawiki\n";
484 }
485 print STDOUT "commit refs/notes/$remotename/mediawiki\n";
486 print STDOUT "committer $author <$author\@$wiki_name> ", $date->epoch, " +0000\n";
487 literal_data("Note added by git-mediawiki during import");
488 if (!$full_import && $n == 1) {
489 print STDOUT "from refs/notes/$remotename/mediawiki^0\n";
490 }
491 print STDOUT "N inline :$n\n";
492 literal_data("mediawiki_revision: " . $commit{mw_revision});
493 print STDOUT "\n\n";
494}
495
496# parse a sequence of
497# <cmd> <arg1>
498# <cmd> <arg2>
499# \n
500# (like batch sequence of import and sequence of push statements)
501sub get_more_refs {
502 my $cmd = shift;
503 my @refs;
504 while (1) {
505 my $line = <STDIN>;
506 if ($line =~ m/^$cmd (.*)$/) {
507 push(@refs, $1);
508 } elsif ($line eq "\n") {
509 return @refs;
510 } else {
511 die("Invalid command in a '$cmd' batch: ". $_);
512 }
513 }
514}
515
516sub mw_import {
517 # multiple import commands can follow each other.
518 my @refs = (shift, get_more_refs("import"));
519 foreach my $ref (@refs) {
520 mw_import_ref($ref);
521 }
522 print STDOUT "done\n";
523}
524
525sub mw_import_ref {
526 my $ref = shift;
527 # The remote helper will call "import HEAD" and
528 # "import refs/heads/master".
529 # Since HEAD is a symbolic ref to master (by convention,
530 # followed by the output of the command "list" that we gave),
531 # we don't need to do anything in this case.
532 if ($ref eq "HEAD") {
533 return;
534 }
535
536 mw_connect_maybe();
537
538 my @pages = get_mw_pages();
539
540 print STDERR "Searching revisions...\n";
541 my $last_local = get_last_local_revision();
542 my $fetch_from = $last_local + 1;
543 if ($fetch_from == 1) {
544 print STDERR ", fetching from beginning.\n";
545 } else {
546 print STDERR ", fetching from here.\n";
547 }
548 my ($n, @revisions) = fetch_mw_revisions(\@pages, $fetch_from);
549
550 # Creation of the fast-import stream
551 print STDERR "Fetching & writing export data...\n";
552
553 $n = 0;
554 my $last_timestamp = 0; # Placeholer in case $rev->timestamp is undefined
555
556 foreach my $pagerevid (sort {$a->{revid} <=> $b->{revid}} @revisions) {
557 # fetch the content of the pages
558 my $query = {
559 action => 'query',
560 prop => 'revisions',
561 rvprop => 'content|timestamp|comment|user|ids',
562 revids => $pagerevid->{revid},
563 };
564
565 my $result = $mediawiki->api($query);
566
567 my $rev = pop(@{$result->{query}->{pages}->{$pagerevid->{pageid}}->{revisions}});
568
569 $n++;
570
571 my %commit;
572 $commit{author} = $rev->{user} || 'Anonymous';
573 $commit{comment} = $rev->{comment} || '*Empty MediaWiki Message*';
574 $commit{title} = mediawiki_smudge_filename(
575 $result->{query}->{pages}->{$pagerevid->{pageid}}->{title}
576 );
577 $commit{mw_revision} = $pagerevid->{revid};
578 $commit{content} = mediawiki_smudge($rev->{'*'});
579
580 if (!defined($rev->{timestamp})) {
581 $last_timestamp++;
582 } else {
583 $last_timestamp = $rev->{timestamp};
584 }
585 $commit{date} = DateTime::Format::ISO8601->parse_datetime($last_timestamp);
586
587 print STDERR "$n/", scalar(@revisions), ": Revision #$pagerevid->{revid} of $commit{title}\n";
588
589 import_file_revision(\%commit, ($fetch_from == 1), $n);
590 }
591
592 if ($fetch_from == 1 && $n == 0) {
593 print STDERR "You appear to have cloned an empty MediaWiki.\n";
594 # Something has to be done remote-helper side. If nothing is done, an error is
595 # thrown saying that HEAD is refering to unknown object 0000000000000000000
596 # and the clone fails.
597 }
598}
599
600sub error_non_fast_forward {
601 # Native git-push would show this after the summary.
602 # We can't ask it to display it cleanly, so print it
603 # ourselves before.
604 print STDERR "To prevent you from losing history, non-fast-forward updates were rejected\n";
605 print STDERR "Merge the remote changes (e.g. 'git pull') before pushing again. See the\n";
606 print STDERR "'Note about fast-forwards' section of 'git push --help' for details.\n";
607
608 print STDOUT "error $_[0] \"non-fast-forward\"\n";
609 return 0;
610}
611
612sub mw_push_file {
613 my $diff_info = shift;
614 # $diff_info contains a string in this format:
615 # 100644 100644 <sha1_of_blob_before_commit> <sha1_of_blob_now> <status>
616 my @diff_info_split = split(/[ \t]/, $diff_info);
617
618 # Filename, including .mw extension
619 my $complete_file_name = shift;
620 # Commit message
621 my $summary = shift;
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622 # MediaWiki revision number. Keep the previous one by default,
623 # in case there's no edit to perform.
624 my $newrevid = shift;
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625
626 my $new_sha1 = $diff_info_split[3];
627 my $old_sha1 = $diff_info_split[2];
628 my $page_created = ($old_sha1 eq NULL_SHA1);
629 my $page_deleted = ($new_sha1 eq NULL_SHA1);
630 $complete_file_name = mediawiki_clean_filename($complete_file_name);
631
632 if (substr($complete_file_name,-3) eq ".mw") {
633 my $title = substr($complete_file_name,0,-3);
634
635 my $file_content;
636 if ($page_deleted) {
637 # Deleting a page usually requires
638 # special priviledges. A common
639 # convention is to replace the page
640 # with this content instead:
641 $file_content = DELETED_CONTENT;
642 } else {
643 $file_content = run_git("cat-file blob $new_sha1");
644 }
645
646 mw_connect_maybe();
647
648 my $result = $mediawiki->edit( {
649 action => 'edit',
650 summary => $summary,
651 title => $title,
652 text => mediawiki_clean($file_content, $page_created),
653 }, {
654 skip_encoding => 1 # Helps with names with accentuated characters
655 }) || die 'Fatal: Error ' .
656 $mediawiki->{error}->{code} .
657 ' from mediwiki: ' . $mediawiki->{error}->{details};
93f0d338 658 $newrevid = $result->{edit}->{newrevid};
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659 print STDERR "Pushed file : $new_sha1 - $title\n";
660 } else {
661 print STDERR "$complete_file_name not a mediawiki file (Not pushable on this version of git-remote-mediawiki).\n"
662 }
93f0d338 663 return $newrevid;
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664}
665
666sub mw_push {
667 # multiple push statements can follow each other
668 my @refsspecs = (shift, get_more_refs("push"));
669 my %status;
670 my $pushed;
671 for my $refspec (@refsspecs) {
672 my ($force, $local, $remote) = $refspec =~ /^(\+)?([^:]*):([^:]*)$/
673 or die("Invalid refspec for push. Expected <src>:<dst> or +<src>:<dst>");
674 if ($force) {
675 print STDERR "Warning: forced push not allowed on a MediaWiki.\n";
676 }
677 if ($local eq "") {
678 print STDERR "Cannot delete remote branch on a MediaWiki\n";
679 print STDOUT "error $remote cannot delete\n";
680 next;
681 }
682 if ($remote ne "refs/heads/master") {
683 print STDERR "Only push to the branch 'master' is supported on a MediaWiki\n";
684 print STDOUT "error $remote only master allowed\n";
685 next;
686 }
687 if (mw_push_revision($local, $remote)) {
688 $pushed = 1;
689 }
690 }
691
692 # Notify Git that the push is done
693 print STDOUT "\n";
694
93f0d338 695 if ($pushed && $dumb_push) {
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696 print STDERR "Just pushed some revisions to MediaWiki.\n";
697 print STDERR "The pushed revisions now have to be re-imported, and your current branch\n";
698 print STDERR "needs to be updated with these re-imported commits. You can do this with\n";
699 print STDERR "\n";
700 print STDERR " git pull --rebase\n";
701 print STDERR "\n";
702 }
703}
704
705sub mw_push_revision {
706 my $local = shift;
707 my $remote = shift; # actually, this has to be "refs/heads/master" at this point.
708 my $last_local_revid = get_last_local_revision();
709 print STDERR ".\n"; # Finish sentence started by get_last_local_revision()
710 my $last_remote_revid = get_last_remote_revision();
93f0d338 711 my $mw_revision = $last_remote_revid;
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712
713 # Get sha1 of commit pointed by local HEAD
714 my $HEAD_sha1 = run_git("rev-parse $local 2>/dev/null"); chomp($HEAD_sha1);
715 # Get sha1 of commit pointed by remotes/$remotename/master
716 my $remoteorigin_sha1 = run_git("rev-parse refs/remotes/$remotename/master 2>/dev/null");
717 chomp($remoteorigin_sha1);
718
719 if ($last_local_revid > 0 &&
720 $last_local_revid < $last_remote_revid) {
721 return error_non_fast_forward($remote);
722 }
723
724 if ($HEAD_sha1 eq $remoteorigin_sha1) {
725 # nothing to push
726 return 0;
727 }
728
729 # Get every commit in between HEAD and refs/remotes/origin/master,
730 # including HEAD and refs/remotes/origin/master
731 my @commit_pairs = ();
732 if ($last_local_revid > 0) {
733 my $parsed_sha1 = $remoteorigin_sha1;
734 # Find a path from last MediaWiki commit to pushed commit
735 while ($parsed_sha1 ne $HEAD_sha1) {
736 my @commit_info = grep(/^$parsed_sha1/, split(/\n/, run_git("rev-list --children $local")));
737 if (!@commit_info) {
738 return error_non_fast_forward($remote);
739 }
740 my @commit_info_split = split(/ |\n/, $commit_info[0]);
741 # $commit_info_split[1] is the sha1 of the commit to export
742 # $commit_info_split[0] is the sha1 of its direct child
743 push(@commit_pairs, \@commit_info_split);
744 $parsed_sha1 = $commit_info_split[1];
745 }
746 } else {
747 # No remote mediawiki revision. Export the whole
748 # history (linearized with --first-parent)
749 print STDERR "Warning: no common ancestor, pushing complete history\n";
750 my $history = run_git("rev-list --first-parent --children $local");
751 my @history = split('\n', $history);
752 @history = @history[1..$#history];
753 foreach my $line (reverse @history) {
754 my @commit_info_split = split(/ |\n/, $line);
755 push(@commit_pairs, \@commit_info_split);
756 }
757 }
758
759 foreach my $commit_info_split (@commit_pairs) {
760 my $sha1_child = @{$commit_info_split}[0];
761 my $sha1_commit = @{$commit_info_split}[1];
762 my $diff_infos = run_git("diff-tree -r --raw -z $sha1_child $sha1_commit");
763 # TODO: we could detect rename, and encode them with a #redirect on the wiki.
764 # TODO: for now, it's just a delete+add
765 my @diff_info_list = split(/\0/, $diff_infos);
766 # Keep the first line of the commit message as mediawiki comment for the revision
767 my $commit_msg = (split(/\n/, run_git("show --pretty=format:\"%s\" $sha1_commit")))[0];
768 chomp($commit_msg);
769 # Push every blob
770 while (@diff_info_list) {
771 # git diff-tree -z gives an output like
772 # <metadata>\0<filename1>\0
773 # <metadata>\0<filename2>\0
774 # and we've split on \0.
775 my $info = shift(@diff_info_list);
776 my $file = shift(@diff_info_list);
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777 $mw_revision = mw_push_file($info, $file, $commit_msg, $mw_revision);
778 }
779 unless ($dumb_push) {
780 run_git("notes --ref=$remotename/mediawiki add -m \"mediawiki_revision: $mw_revision\" $sha1_commit");
781 run_git("update-ref -m \"Git-MediaWiki push\" refs/mediawiki/$remotename/master $sha1_commit $sha1_child");
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782 }
783 }
784
785 print STDOUT "ok $remote\n";
786 return 1;
787}