#! /usr/bin/perl
# Copyright (C) 2011
# Jérémie Nikaes <jeremie.nikaes@ensimag.imag.fr>
# Arnaud Lacurie <arnaud.lacurie@ensimag.imag.fr>
# Claire Fousse <claire.fousse@ensimag.imag.fr>
# David Amouyal <david.amouyal@ensimag.imag.fr>
# Matthieu Moy <matthieu.moy@grenoble-inp.fr>
# License: GPL v2 or later
# Gateway between Git and MediaWiki.
# Documentation & bugtracker: https://github.com/Git-Mediawiki/Git-Mediawiki
use strict;
use MediaWiki::API;
use Git;
use Git::Mediawiki qw(clean_filename smudge_filename connect_maybe
EMPTY HTTP_CODE_OK);
use DateTime::Format::ISO8601;
use warnings;
# By default, use UTF-8 to communicate with Git and the user
binmode STDERR, ':encoding(UTF-8)';
binmode STDOUT, ':encoding(UTF-8)';
use URI::Escape;
# It's not always possible to delete pages (may require some
# privileges). Deleted pages are replaced with this content.
use constant DELETED_CONTENT => "[[Category:Deleted]]\n";
# It's not possible to create empty pages. New empty files in Git are
# sent with this content instead.
use constant EMPTY_CONTENT => "<!-- empty page -->\n";
# used to reflect file creation or deletion in diff.
use constant NULL_SHA1 => '0000000000000000000000000000000000000000';
# Used on Git's side to reflect empty edit messages on the wiki
use constant EMPTY_MESSAGE => '*Empty MediaWiki Message*';
# Number of pages taken into account at once in submodule get_mw_page_list
use constant SLICE_SIZE => 50;
# Number of linked mediafile to get at once in get_linked_mediafiles
# The query is split in small batches because of the MW API limit of
# the number of links to be returned (500 links max).
use constant BATCH_SIZE => 10;
if (@ARGV != 2) {
exit_error_usage();
}
my $remotename = $ARGV[0];
my $url = $ARGV[1];
# Accept both space-separated and multiple keys in config file.
# Spaces should be written as _ anyway because we'll use chomp.
my @tracked_pages = split(/[ \n]/, run_git_quoted(["config", "--get-all", "remote.${remotename}.pages"]));
chomp(@tracked_pages);
# Just like @tracked_pages, but for MediaWiki categories.
my @tracked_categories = split(/[ \n]/, run_git_quoted(["config", "--get-all", "remote.${remotename}.categories"]));
chomp(@tracked_categories);
# Just like @tracked_categories, but for MediaWiki namespaces.
my @tracked_namespaces = split(/[ \n]/, run_git_quoted(["config", "--get-all", "remote.${remotename}.namespaces"]));
for (@tracked_namespaces) { s/_/ /g; }
chomp(@tracked_namespaces);
# Import media files on pull
my $import_media = run_git_quoted(["config", "--get", "--bool", "remote.${remotename}.mediaimport"]);
chomp($import_media);
$import_media = ($import_media eq 'true');
# Export media files on push
my $export_media = run_git_quoted(["config", "--get", "--bool", "remote.${remotename}.mediaexport"]);
chomp($export_media);
$export_media = !($export_media eq 'false');
my $wiki_login = run_git_quoted(["config", "--get", "remote.${remotename}.mwLogin"]);
# Note: mwPassword is discouraged. Use the credential system instead.
my $wiki_passwd = run_git_quoted(["config", "--get", "remote.${remotename}.mwPassword"]);
my $wiki_domain = run_git_quoted(["config", "--get", "remote.${remotename}.mwDomain"]);
chomp($wiki_login);
chomp($wiki_passwd);
chomp($wiki_domain);
# Import only last revisions (both for clone and fetch)
my $shallow_import = run_git_quoted(["config", "--get", "--bool", "remote.${remotename}.shallow"]);
chomp($shallow_import);
$shallow_import = ($shallow_import eq 'true');
# Fetch (clone and pull) by revisions instead of by pages. This behavior
# is more efficient when we have a wiki with lots of pages and we fetch
# the revisions quite often so that they concern only few pages.
# Possible values:
# - by_rev: perform one query per new revision on the remote wiki
# - by_page: query each tracked page for new revision
my $fetch_strategy = run_git_quoted(["config", "--get", "remote.${remotename}.fetchStrategy"]);
if (!$fetch_strategy) {
$fetch_strategy = run_git_quoted(["config", "--get", "mediawiki.fetchStrategy"]);
}
chomp($fetch_strategy);
if (!$fetch_strategy) {
$fetch_strategy = 'by_page';
}
# Remember the timestamp corresponding to a revision id.
my %basetimestamps;
# Dumb push: don't update notes and mediawiki ref to reflect the last push.
#
# Configurable with mediawiki.dumbPush, or per-remote with
# remote.<remotename>.dumbPush.
#
# This means the user will have to re-import the just-pushed
# revisions. On the other hand, this means that the Git revisions
# corresponding to MediaWiki revisions are all imported from the wiki,
# regardless of whether they were initially created in Git or from the
# web interface, hence all users will get the same history (i.e. if
# the push from Git to MediaWiki loses some information, everybody
# will get the history with information lost). If the import is
# deterministic, this means everybody gets the same sha1 for each
# MediaWiki revision.
my $dumb_push = run_git_quoted(["config", "--get", "--bool", "remote.${remotename}.dumbPush"]);
if (!$dumb_push) {
$dumb_push = run_git_quoted(["config", "--get", "--bool", "mediawiki.dumbPush"]);
}
chomp($dumb_push);
$dumb_push = ($dumb_push eq 'true');
my $wiki_name = $url;
$wiki_name =~ s{[^/]*://}{};
# If URL is like http://user:password@example.com/, we clearly don't
# want the password in $wiki_name. While we're there, also remove user
# and '@' sign, to avoid author like MWUser@HTTPUser@host.com
$wiki_name =~ s/^.*@//;
# Commands parser
while (<STDIN>) {
chomp;
if (!parse_command($_)) {
last;
}
BEGIN { $| = 1 } # flush STDOUT, to make sure the previous
# command is fully processed.
}
########################## Functions ##############################
## error handling
sub exit_error_usage {
die "ERROR: git-remote-mediawiki module was not called with a correct number of\n" .
"parameters\n" .
"You may obtain this error because you attempted to run the git-remote-mediawiki\n" .
"module directly.\n" .
"This module can be used the following way:\n" .
"\tgit clone mediawiki://<address of a mediawiki>\n" .
"Then, use git commit, push and pull as with every normal git repository.\n";
}
sub parse_command {
my ($line) = @_;
my @cmd = split(/ /, $line);
if (!defined $cmd[0]) {
return 0;
}
if ($cmd[0] eq 'capabilities') {
die("Too many arguments for capabilities\n")
if (defined($cmd[1]));
mw_capabilities();
} elsif ($cmd[0] eq 'list') {
die("Too many arguments for list\n") if (defined($cmd[2]));
mw_list($cmd[1]);
} elsif ($cmd[0] eq 'import') {
die("Invalid argument for import\n")
if ($cmd[1] eq EMPTY);
die("Too many arguments for import\n")
if (defined($cmd[2]));
mw_import($cmd[1]);
} elsif ($cmd[0] eq 'option') {
die("Invalid arguments for option\n")
if ($cmd[1] eq EMPTY || $cmd[2] eq EMPTY);
die("Too many arguments for option\n")
if (defined($cmd[3]));
mw_option($cmd[1],$cmd[2]);
} elsif ($cmd[0] eq 'push') {
mw_push($cmd[1]);
} else {
print {*STDERR} "Unknown command. Aborting...\n";
return 0;
}
return 1;
}
# MediaWiki API instance, created lazily.
my $mediawiki;
sub fatal_mw_error {
my $action = shift;
print STDERR "fatal: could not $action.\n";
print STDERR "fatal: '$url' does not appear to be a mediawiki\n";
if ($url =~ /^https/) {
print STDERR "fatal: make sure '$url/api.php' is a valid page\n";
print STDERR "fatal: and the SSL certificate is correct.\n";
} else {
print STDERR "fatal: make sure '$url/api.php' is a valid page.\n";
}
print STDERR "fatal: (error " .
$mediawiki->{error}->{code} . ': ' .
$mediawiki->{error}->{details} . ")\n";
exit 1;
}
## Functions for listing pages on the remote wiki
sub get_mw_tracked_pages {
my $pages = shift;
get_mw_page_list(\@tracked_pages, $pages);
return;
}
sub get_mw_page_list {
my $page_list = shift;
my $pages = shift;
my @some_pages = @{$page_list};
while (@some_pages) {
my $last_page = SLICE_SIZE;
if ($#some_pages < $last_page) {
$last_page = $#some_pages;
}
my @slice = @some_pages[0..$last_page];
get_mw_first_pages(\@slice, $pages);
@some_pages = @some_pages[(SLICE_SIZE + 1)..$#some_pages];
}
return;
}
sub get_mw_tracked_categories {
my $pages = shift;
foreach my $category (@tracked_categories) {
if (index($category, ':') < 0) {
# Mediawiki requires the Category
# prefix, but let's not force the user
# to specify it.
$category = "Category:${category}";
}
my $mw_pages = $mediawiki->list( {
action => 'query',
list => 'categorymembers',
cmtitle => $category,
cmlimit => 'max' } )
|| die $mediawiki->{error}->{code} . ': '
. $mediawiki->{error}->{details} . "\n";
foreach my $page (@{$mw_pages}) {
$pages->{$page->{title}} = $page;
}
}
return;
}
sub get_mw_tracked_namespaces {
my $pages = shift;
foreach my $local_namespace (sort @tracked_namespaces) {
my $namespace_id;
if ($local_namespace eq "(Main)") {
$namespace_id = 0;
} else {
$namespace_id = get_mw_namespace_id($local_namespace);
}
# virtual namespaces don't support allpages
next if !defined($namespace_id) || $namespace_id < 0;
my $mw_pages = $mediawiki->list( {
action => 'query',
list => 'allpages',
apnamespace => $namespace_id,
aplimit => 'max' } )
|| die $mediawiki->{error}->{code} . ': '
. $mediawiki->{error}->{details} . "\n";
print {*STDERR} "$#{$mw_pages} found in namespace $local_namespace ($namespace_id)\n";
foreach my $page (@{$mw_pages}) {
$pages->{$page->{title}} = $page;
}
}
return;
}
sub get_mw_all_pages {
my $pages = shift;
# No user-provided list, get the list of pages from the API.
my $mw_pages = $mediawiki->list({
action => 'query',
list => 'allpages',
aplimit => 'max'
});
if (!defined($mw_pages)) {
fatal_mw_error("get the list of wiki pages");
}
foreach my $page (@{$mw_pages}) {
$pages->{$page->{title}} = $page;
}
return;
}
# queries the wiki for a set of pages. Meant to be used within a loop
# querying the wiki for slices of page list.
sub get_mw_first_pages {
my $some_pages = shift;
my @some_pages = @{$some_pages};
my $pages = shift;
# pattern 'page1|page2|...' required by the API
my $titles = join('|', @some_pages);
my $mw_pages = $mediawiki->api({
action => 'query',
titles => $titles,
});
if (!defined($mw_pages)) {
fatal_mw_error("query the list of wiki pages");
}
while (my ($id, $page) = each(%{$mw_pages->{query}->{pages}})) {
if ($id < 0) {
print {*STDERR} "Warning: page $page->{title} not found on wiki\n";
} else {
$pages->{$page->{title}} = $page;
}
}
return;
}
# Get the list of pages to be fetched according to configuration.
sub get_mw_pages {
$mediawiki = connect_maybe($mediawiki, $remotename, $url);
print {*STDERR} "Listing pages on remote wiki...\n";
my %pages; # hash on page titles to avoid duplicates
my $user_defined;
if (@tracked_pages) {
$user_defined = 1;
# The user provided a list of pages titles, but we
# still need to query the API to get the page IDs.
get_mw_tracked_pages(\%pages);
}
if (@tracked_categories) {
$user_defined = 1;
get_mw_tracked_categories(\%pages);
}
if (@tracked_namespaces) {
$user_defined = 1;
get_mw_tracked_namespaces(\%pages);
}
if (!$user_defined) {
get_mw_all_pages(\%pages);
}
if ($import_media) {
print {*STDERR} "Getting media files for selected pages...\n";
if ($user_defined) {
get_linked_mediafiles(\%pages);
} else {
get_all_mediafiles(\%pages);
}
}
print {*STDERR} (scalar keys %pages) . " pages found.\n";
return %pages;
}
# usage: $out = run_git_quoted(["command", "args", ...]);
# $out = run_git_quoted(["command", "args", ...], "raw"); # don't interpret output as UTF-8.
# $out = run_git_quoted_nostderr(["command", "args", ...]); # discard stderr
# $out = run_git_quoted_nostderr(["command", "args", ...], "raw"); # ditto but raw instead of UTF-8 as above
sub _run_git {
my $args = shift;
my $encoding = (shift || 'encoding(UTF-8)');
open(my $git, "-|:${encoding}", @$args)
or die "Unable to fork: $!\n";
my $res = do {
local $/ = undef;
<$git>
};
close($git);
return $res;
}
sub run_git_quoted {
_run_git(["git", @{$_[0]}], $_[1]);
}
sub run_git_quoted_nostderr {
_run_git(['sh', '-c', 'git "$@" 2>/dev/null', '--', @{$_[0]}], $_[1]);
}
sub get_all_mediafiles {
my $pages = shift;
# Attach list of all pages for media files from the API,
# they are in a different namespace, only one namespace
# can be queried at the same moment
my $mw_pages = $mediawiki->list({
action => 'query',
list => 'allpages',
apnamespace => get_mw_namespace_id('File'),
aplimit => 'max'
});
if (!defined($mw_pages)) {
print {*STDERR} "fatal: could not get the list of pages for media files.\n";
print {*STDERR} "fatal: '$url' does not appear to be a mediawiki\n";
print {*STDERR} "fatal: make sure '$url/api.php' is a valid page.\n";
exit 1;
}
foreach my $page (@{$mw_pages}) {
$pages->{$page->{title}} = $page;
}
return;
}
sub get_linked_mediafiles {
my $pages = shift;
my @titles = map { $_->{title} } values(%{$pages});
my $batch = BATCH_SIZE;
while (@titles) {
if ($#titles < $batch) {
$batch = $#titles;
}
my @slice = @titles[0..$batch];
# pattern 'page1|page2|...' required by the API
my $mw_titles = join('|', @slice);
# Media files could be included or linked from
# a page, get all related
my $query = {
action => 'query',
prop => 'links|images',
titles => $mw_titles,
plnamespace => get_mw_namespace_id('File'),
pllimit => 'max'
};
my $result = $mediawiki->api($query);
while (my ($id, $page) = each(%{$result->{query}->{pages}})) {
my @media_titles;
if (defined($page->{links})) {
my @link_titles
= map { $_->{title} } @{$page->{links}};
push(@media_titles, @link_titles);
}
if (defined($page->{images})) {
my @image_titles
= map { $_->{title} } @{$page->{images}};
push(@media_titles, @image_titles);
}
if (@media_titles) {
get_mw_page_list(\@media_titles, $pages);
}
}
@titles = @titles[($batch+1)..$#titles];
}
return;
}
sub get_mw_mediafile_for_page_revision {
# Name of the file on Wiki, with the prefix.
my $filename = shift;
my $timestamp = shift;
my %mediafile;
# Search if on a media file with given timestamp exists on
# MediaWiki. In that case download the file.
my $query = {
action => 'query',
prop => 'imageinfo',
titles => "File:${filename}",
iistart => $timestamp,
iiend => $timestamp,
iiprop => 'timestamp|archivename|url',
iilimit => 1
};
my $result = $mediawiki->api($query);
my ($fileid, $file) = each( %{$result->{query}->{pages}} );
# If not defined it means there is no revision of the file for
# given timestamp.
if (defined($file->{imageinfo})) {
$mediafile{title} = $filename;
my $fileinfo = pop(@{$file->{imageinfo}});
$mediafile{timestamp} = $fileinfo->{timestamp};
# Mediawiki::API's download function doesn't support https URLs
# and can't download old versions of files.
print {*STDERR} "\tDownloading file $mediafile{title}, version $mediafile{timestamp}\n";
$mediafile{content} = download_mw_mediafile($fileinfo->{url});
}
return %mediafile;
}
sub download_mw_mediafile {
my $download_url = shift;
my $response = $mediawiki->{ua}->get($download_url);
if ($response->code == HTTP_CODE_OK) {
# It is tempting to return
# $response->decoded_content({charset => "none"}), but
# when doing so, utf8::downgrade($content) fails with
# "Wide character in subroutine entry".
$response->decode();
return $response->content();
} else {
print {*STDERR} "Error downloading mediafile from :\n";
print {*STDERR} "URL: ${download_url}\n";
print {*STDERR} 'Server response: ' . $response->code . q{ } . $response->message . "\n";
exit 1;
}
}
sub get_last_local_revision {
# Get note regarding last mediawiki revision.
my $note = run_git_quoted_nostderr(["notes", "--ref=${remotename}/mediawiki",
"show", "refs/mediawiki/${remotename}/master"]);
my @note_info = split(/ /, $note);
my $lastrevision_number;
if (!(defined($note_info[0]) && $note_info[0] eq 'mediawiki_revision:')) {
print {*STDERR} 'No previous mediawiki revision found';
$lastrevision_number = 0;
} else {
# Notes are formatted : mediawiki_revision: #number
$lastrevision_number = $note_info[1];
chomp($lastrevision_number);
print {*STDERR} "Last local mediawiki revision found is ${lastrevision_number}";
}
return $lastrevision_number;
}
# Get the last remote revision without taking in account which pages are
# tracked or not. This function makes a single request to the wiki thus
# avoid a loop onto all tracked pages. This is useful for the fetch-by-rev
# option.
sub get_last_global_remote_rev {
$mediawiki = connect_maybe($mediawiki, $remotename, $url);
my $query = {
action => 'query',
list => 'recentchanges',
prop => 'revisions',
rclimit => '1',
rcdir => 'older',
};
my $result = $mediawiki->api($query);
return $result->{query}->{recentchanges}[0]->{revid};
}
# Get the last remote revision concerning the tracked pages and the tracked
# categories.
sub get_last_remote_revision {
$mediawiki = connect_maybe($mediawiki, $remotename, $url);
my %pages_hash = get_mw_pages();
my @pages = values(%pages_hash);
my $max_rev_num = 0;
print {*STDERR} "Getting last revision id on tracked pages...\n";
foreach my $page (@pages) {
my $id = $page->{pageid};
my $query = {
action => 'query',
prop => 'revisions',
rvprop => 'ids|timestamp',
pageids => $id,
};
my $result = $mediawiki->api($query);
my $lastrev = pop(@{$result->{query}->{pages}->{$id}->{revisions}});
$basetimestamps{$lastrev->{revid}} = $lastrev->{timestamp};
$max_rev_num = ($lastrev->{revid} > $max_rev_num ? $lastrev->{revid} : $max_rev_num);
}
print {*STDERR} "Last remote revision found is $max_rev_num.\n";
return $max_rev_num;
}
# Clean content before sending it to MediaWiki
sub mediawiki_clean {
my $string = shift;
my $page_created = shift;
# Mediawiki does not allow blank space at the end of a page and ends with a single \n.
# This function right trims a string and adds a \n at the end to follow this rule
$string =~ s/\s+$//;
if ($string eq EMPTY && $page_created) {
# Creating empty pages is forbidden.
$string = EMPTY_CONTENT;
}
return $string."\n";
}
# Filter applied on MediaWiki data before adding them to Git
sub mediawiki_smudge {
my $string = shift;
if ($string eq EMPTY_CONTENT) {
$string = EMPTY;
}
# This \n is important. This is due to mediawiki's way to handle end of files.
return "${string}\n";
}
sub literal_data {
my ($content) = @_;
print {*STDOUT} 'data ', bytes::length($content), "\n", $content;
return;
}
sub literal_data_raw {
# Output possibly binary content.
my ($content) = @_;
# Avoid confusion between size in bytes and in characters
utf8::downgrade($content);
binmode STDOUT, ':raw';
print {*STDOUT} 'data ', bytes::length($content), "\n", $content;
binmode STDOUT, ':encoding(UTF-8)';
return;
}
sub mw_capabilities {
# Revisions are imported to the private namespace
# refs/mediawiki/$remotename/ by the helper and fetched into
# refs/remotes/$remotename later by fetch.
print {*STDOUT} "refspec refs/heads/*:refs/mediawiki/${remotename}/*\n";
print {*STDOUT} "import\n";
print {*STDOUT} "list\n";
print {*STDOUT} "push\n";
if ($dumb_push) {
print {*STDOUT} "no-private-update\n";
}
print {*STDOUT} "\n";
return;
}
sub mw_list {
# MediaWiki do not have branches, we consider one branch arbitrarily
# called master, and HEAD pointing to it.
print {*STDOUT} "? refs/heads/master\n";
print {*STDOUT} "\@refs/heads/master HEAD\n";
print {*STDOUT} "\n";
return;
}
sub mw_option {
print {*STDERR} "remote-helper command 'option $_[0]' not yet implemented\n";
print {*STDOUT} "unsupported\n";
return;
}
sub fetch_mw_revisions_for_page {
my $page = shift;
my $id = shift;
my $fetch_from = shift;
my @page_revs = ();
my $query = {
action => 'query',
prop => 'revisions',
rvprop => 'ids',
rvdir => 'newer',
rvstartid => $fetch_from,
rvlimit => 500,
pageids => $id,
# Let MediaWiki know that we support the latest API.
continue => '',
};
my $revnum = 0;
# Get 500 revisions at a time due to the mediawiki api limit
while (1) {
my $result = $mediawiki->api($query);
# Parse each of those 500 revisions
foreach my $revision (@{$result->{query}->{pages}->{$id}->{revisions}}) {
my $page_rev_ids;
$page_rev_ids->{pageid} = $page->{pageid};
$page_rev_ids->{revid} = $revision->{revid};
push(@page_revs, $page_rev_ids);
$revnum++;
}
if ($result->{'query-continue'}) { # For legacy APIs
$query->{rvstartid} = $result->{'query-continue'}->{revisions}->{rvstartid};
} elsif ($result->{continue}) { # For newer APIs
$query->{rvstartid} = $result->{continue}->{rvcontinue};
$query->{continue} = $result->{continue}->{continue};
} else {
last;
}
}
if ($shallow_import && @page_revs) {
print {*STDERR} " Found 1 revision (shallow import).\n";
@page_revs = sort {$b->{revid} <=> $a->{revid}} (@page_revs);
return $page_revs[0];
}
print {*STDERR} " Found ${revnum} revision(s).\n";
return @page_revs;
}
sub fetch_mw_revisions {
my $pages = shift; my @pages = @{$pages};
my $fetch_from = shift;
my @revisions = ();
my $n = 1;
foreach my $page (@pages) {
my $id = $page->{pageid};
print {*STDERR} "page ${n}/", scalar(@pages), ': ', $page->{title}, "\n";
$n++;
my @page_revs = fetch_mw_revisions_for_page($page, $id, $fetch_from);
@revisions = (@page_revs, @revisions);
}
return ($n, @revisions);
}
sub fe_escape_path {
my $path = shift;
$path =~ s/\\/\\\\/g;
$path =~ s/"/\\"/g;
$path =~ s/\n/\\n/g;
return qq("${path}");
}
sub import_file_revision {
my $commit = shift;
my %commit = %{$commit};
my $full_import = shift;
my $n = shift;
my $mediafile = shift;
my %mediafile;
if ($mediafile) {
%mediafile = %{$mediafile};
}
my $title = $commit{title};
my $comment = $commit{comment};
my $content = $commit{content};
my $author = $commit{author};
my $date = $commit{date};
print {*STDOUT} "commit refs/mediawiki/${remotename}/master\n";
print {*STDOUT} "mark :${n}\n";
print {*STDOUT} "committer ${author} <${author}\@${wiki_name}> " . $date->epoch . " +0000\n";
literal_data($comment);
# If it's not a clone, we need to know where to start from
if (!$full_import && $n == 1) {
print {*STDOUT} "from refs/mediawiki/${remotename}/master^0\n";
}
if ($content ne DELETED_CONTENT) {
print {*STDOUT} 'M 644 inline ' .
fe_escape_path("${title}.mw") . "\n";
literal_data($content);
if (%mediafile) {
print {*STDOUT} 'M 644 inline '
. fe_escape_path($mediafile{title}) . "\n";
literal_data_raw($mediafile{content});
}
print {*STDOUT} "\n\n";
} else {
print {*STDOUT} 'D ' . fe_escape_path("${title}.mw") . "\n";
}
# mediawiki revision number in the git note
if ($full_import && $n == 1) {
print {*STDOUT} "reset refs/notes/${remotename}/mediawiki\n";
}
print {*STDOUT} "commit refs/notes/${remotename}/mediawiki\n";
print {*STDOUT} "committer ${author} <${author}\@${wiki_name}> " . $date->epoch . " +0000\n";
literal_data('Note added by git-mediawiki during import');
if (!$full_import && $n == 1) {
print {*STDOUT} "from refs/notes/${remotename}/mediawiki^0\n";
}
print {*STDOUT} "N inline :${n}\n";
literal_data("mediawiki_revision: $commit{mw_revision}");
print {*STDOUT} "\n\n";
return;
}
# parse a sequence of
# <cmd> <arg1>
# <cmd> <arg2>
# \n
# (like batch sequence of import and sequence of push statements)
sub get_more_refs {
my $cmd = shift;
my @refs;
while (1) {
my $line = <STDIN>;
if ($line =~ /^$cmd (.*)$/) {
push(@refs, $1);
} elsif ($line eq "\n") {
return @refs;
} else {
die("Invalid command in a '$cmd' batch: $_\n");
}
}
return;
}
sub mw_import {
# multiple import commands can follow each other.
my @refs = (shift, get_more_refs('import'));
my $processedRefs;
foreach my $ref (@refs) {
next if $processedRefs->{$ref}; # skip duplicates: "import refs/heads/master" being issued twice; TODO: why?
$processedRefs->{$ref} = 1;
mw_import_ref($ref);
}
print {*STDOUT} "done\n";
return;
}
sub mw_import_ref {
my $ref = shift;
# The remote helper will call "import HEAD" and
# "import refs/heads/master".
# Since HEAD is a symbolic ref to master (by convention,
# followed by the output of the command "list" that we gave),
# we don't need to do anything in this case.
if ($ref eq 'HEAD') {
return;
}
$mediawiki = connect_maybe($mediawiki, $remotename, $url);
print {*STDERR} "Searching revisions...\n";
my $last_local = get_last_local_revision();
my $fetch_from = $last_local + 1;
if ($fetch_from == 1) {
print {*STDERR} ", fetching from beginning.\n";
} else {
print {*STDERR} ", fetching from here.\n";
}
my $n = 0;
if ($fetch_strategy eq 'by_rev') {
print {*STDERR} "Fetching & writing export data by revs...\n";
$n = mw_import_ref_by_revs($fetch_from);
} elsif ($fetch_strategy eq 'by_page') {
print {*STDERR} "Fetching & writing export data by pages...\n";
$n = mw_import_ref_by_pages($fetch_from);
} else {
print {*STDERR} qq(fatal: invalid fetch strategy "${fetch_strategy}".\n);
print {*STDERR} "Check your configuration variables remote.${remotename}.fetchStrategy and mediawiki.fetchStrategy\n";
exit 1;
}
if ($fetch_from == 1 && $n == 0) {
print {*STDERR} "You appear to have cloned an empty MediaWiki.\n";
# Something has to be done remote-helper side. If nothing is done, an error is
# thrown saying that HEAD is referring to unknown object 0000000000000000000
# and the clone fails.
}
return;
}
sub mw_import_ref_by_pages {
my $fetch_from = shift;
my %pages_hash = get_mw_pages();
my @pages = values(%pages_hash);
my ($n, @revisions) = fetch_mw_revisions(\@pages, $fetch_from);
@revisions = sort {$a->{revid} <=> $b->{revid}} @revisions;
my @revision_ids = map { $_->{revid} } @revisions;
return mw_import_revids($fetch_from, \@revision_ids, \%pages_hash);
}
sub mw_import_ref_by_revs {
my $fetch_from = shift;
my %pages_hash = get_mw_pages();
my $last_remote = get_last_global_remote_rev();
my @revision_ids = $fetch_from..$last_remote;
return mw_import_revids($fetch_from, \@revision_ids, \%pages_hash);
}
# Import revisions given in second argument (array of integers).
# Only pages appearing in the third argument (hash indexed by page titles)
# will be imported.
sub mw_import_revids {
my $fetch_from = shift;
my $revision_ids = shift;
my $pages = shift;
my $n = 0;
my $n_actual = 0;
my $last_timestamp = 0; # Placeholder in case $rev->timestamp is undefined
foreach my $pagerevid (@{$revision_ids}) {
# Count page even if we skip it, since we display
# $n/$total and $total includes skipped pages.
$n++;
# fetch the content of the pages
my $query = {
action => 'query',
prop => 'revisions',
rvprop => 'content|timestamp|comment|user|ids',
revids => $pagerevid,
};
my $result = $mediawiki->api($query);
if (!$result) {
die "Failed to retrieve modified page for revision $pagerevid\n";
}
if (defined($result->{query}->{badrevids}->{$pagerevid})) {
# The revision id does not exist on the remote wiki.
next;
}
if (!defined($result->{query}->{pages})) {
die "Invalid revision ${pagerevid}.\n";
}
my @result_pages = values(%{$result->{query}->{pages}});
my $result_page = $result_pages[0];
my $rev = $result_pages[0]->{revisions}->[0];
my $page_title = $result_page->{title};
if (!exists($pages->{$page_title})) {
print {*STDERR} "${n}/", scalar(@{$revision_ids}),
": Skipping revision #$rev->{revid} of ${page_title}\n";
next;
}
$n_actual++;
my %commit;
$commit{author} = $rev->{user} || 'Anonymous';
$commit{comment} = $rev->{comment} || EMPTY_MESSAGE;
$commit{title} = smudge_filename($page_title);
$commit{mw_revision} = $rev->{revid};
$commit{content} = mediawiki_smudge($rev->{'*'});
if (!defined($rev->{timestamp})) {
$last_timestamp++;
} else {
$last_timestamp = $rev->{timestamp};
}
$commit{date} = DateTime::Format::ISO8601->parse_datetime($last_timestamp);
# Differentiates classic pages and media files.
my ($namespace, $filename) = $page_title =~ /^([^:]*):(.*)$/;
my %mediafile;
if ($namespace) {
my $id = get_mw_namespace_id($namespace);
if ($id && $id == get_mw_namespace_id('File')) {
%mediafile = get_mw_mediafile_for_page_revision($filename, $rev->{timestamp});
}
}
# If this is a revision of the media page for new version
# of a file do one common commit for both file and media page.
# Else do commit only for that page.
print {*STDERR} "${n}/", scalar(@{$revision_ids}), ": Revision #$rev->{revid} of $commit{title}\n";
import_file_revision(\%commit, ($fetch_from == 1), $n_actual, \%mediafile);
}
return $n_actual;
}
sub error_non_fast_forward {
my $advice = run_git_quoted(["config", "--bool", "advice.pushNonFastForward"]);
chomp($advice);
if ($advice ne 'false') {
# Native git-push would show this after the summary.
# We can't ask it to display it cleanly, so print it
# ourselves before.
print {*STDERR} "To prevent you from losing history, non-fast-forward updates were rejected\n";
print {*STDERR} "Merge the remote changes (e.g. 'git pull') before pushing again. See the\n";
print {*STDERR} "'Note about fast-forwards' section of 'git push --help' for details.\n";
}
print {*STDOUT} qq(error $_[0] "non-fast-forward"\n);
return 0;
}
sub mw_upload_file {
my $complete_file_name = shift;
my $new_sha1 = shift;
my $extension = shift;
my $file_deleted = shift;
my $summary = shift;
my $newrevid;
my $path = "File:${complete_file_name}";
my %hashFiles = get_allowed_file_extensions();
if (!exists($hashFiles{$extension})) {
print {*STDERR} "${complete_file_name} is not a permitted file on this wiki.\n";
print {*STDERR} "Check the configuration of file uploads in your mediawiki.\n";
return $newrevid;
}
# Deleting and uploading a file requires a privileged user
if ($file_deleted) {
$mediawiki = connect_maybe($mediawiki, $remotename, $url);
my $query = {
action => 'delete',
title => $path,
reason => $summary
};
if (!$mediawiki->edit($query)) {
print {*STDERR} "Failed to delete file on remote wiki\n";
print {*STDERR} "Check your permissions on the remote site. Error code:\n";
print {*STDERR} $mediawiki->{error}->{code} . ':' . $mediawiki->{error}->{details};
exit 1;
}
} else {
# Don't let perl try to interpret file content as UTF-8 => use "raw"
my $content = run_git_quoted(["cat-file", "blob", $new_sha1], 'raw');
if ($content ne EMPTY) {
$mediawiki = connect_maybe($mediawiki, $remotename, $url);
$mediawiki->{config}->{upload_url} =
"${url}/index.php/Special:Upload";
$mediawiki->edit({
action => 'upload',
filename => $complete_file_name,
comment => $summary,
file => [undef,
$complete_file_name,
Content => $content],
ignorewarnings => 1,
}, {
skip_encoding => 1
} ) || die $mediawiki->{error}->{code} . ':'
. $mediawiki->{error}->{details} . "\n";
my $last_file_page = $mediawiki->get_page({title => $path});
$newrevid = $last_file_page->{revid};
print {*STDERR} "Pushed file: ${new_sha1} - ${complete_file_name}.\n";
} else {
print {*STDERR} "Empty file ${complete_file_name} not pushed.\n";
}
}
return $newrevid;
}
sub mw_push_file {
my $diff_info = shift;
# $diff_info contains a string in this format:
# 100644 100644 <sha1_of_blob_before_commit> <sha1_of_blob_now> <status>
my @diff_info_split = split(/[ \t]/, $diff_info);
# Filename, including .mw extension
my $complete_file_name = shift;
# Commit message
my $summary = shift;
# MediaWiki revision number. Keep the previous one by default,
# in case there's no edit to perform.
my $oldrevid = shift;
my $newrevid;
if ($summary eq EMPTY_MESSAGE) {
$summary = EMPTY;
}
my $new_sha1 = $diff_info_split[3];
my $old_sha1 = $diff_info_split[2];
my $page_created = ($old_sha1 eq NULL_SHA1);
my $page_deleted = ($new_sha1 eq NULL_SHA1);
$complete_file_name = clean_filename($complete_file_name);
my ($title, $extension) = $complete_file_name =~ /^(.*)\.([^\.]*)$/;
if (!defined($extension)) {
$extension = EMPTY;
}
if ($extension eq 'mw') {
my $ns = get_mw_namespace_id_for_page($complete_file_name);
if ($ns && $ns == get_mw_namespace_id('File') && (!$export_media)) {
print {*STDERR} "Ignoring media file related page: ${complete_file_name}\n";
return ($oldrevid, 'ok');
}
my $file_content;
if ($page_deleted) {
# Deleting a page usually requires
# special privileges. A common
# convention is to replace the page
# with this content instead:
$file_content = DELETED_CONTENT;
} else {
$file_content = run_git_quoted(["cat-file", "blob", $new_sha1]);
}
$mediawiki = connect_maybe($mediawiki, $remotename, $url);
my $result = $mediawiki->edit( {
action => 'edit',
summary => $summary,
title => $title,
basetimestamp => $basetimestamps{$oldrevid},
text => mediawiki_clean($file_content, $page_created),
}, {
skip_encoding => 1 # Helps with names with accentuated characters
});
if (!$result) {
if ($mediawiki->{error}->{code} == 3) {
# edit conflicts, considered as non-fast-forward
print {*STDERR} 'Warning: Error ' .
$mediawiki->{error}->{code} .
' from mediawiki: ' . $mediawiki->{error}->{details} .
".\n";
return ($oldrevid, 'non-fast-forward');
} else {
# Other errors. Shouldn't happen => just die()
die 'Fatal: Error ' .
$mediawiki->{error}->{code} .
' from mediawiki: ' . $mediawiki->{error}->{details} . "\n";
}
}
$newrevid = $result->{edit}->{newrevid};
print {*STDERR} "Pushed file: ${new_sha1} - ${title}\n";
} elsif ($export_media) {
$newrevid = mw_upload_file($complete_file_name, $new_sha1,
$extension, $page_deleted,
$summary);
} else {
print {*STDERR} "Ignoring media file ${title}\n";
}
$newrevid = ($newrevid or $oldrevid);
return ($newrevid, 'ok');
}
sub mw_push {
# multiple push statements can follow each other
my @refsspecs = (shift, get_more_refs('push'));
my $pushed;
for my $refspec (@refsspecs) {
my ($force, $local, $remote) = $refspec =~ /^(\+)?([^:]*):([^:]*)$/
or die("Invalid refspec for push. Expected <src>:<dst> or +<src>:<dst>\n");
if ($force) {
print {*STDERR} "Warning: forced push not allowed on a MediaWiki.\n";
}
if ($local eq EMPTY) {
print {*STDERR} "Cannot delete remote branch on a MediaWiki\n";
print {*STDOUT} "error ${remote} cannot delete\n";
next;
}
if ($remote ne 'refs/heads/master') {
print {*STDERR} "Only push to the branch 'master' is supported on a MediaWiki\n";
print {*STDOUT} "error ${remote} only master allowed\n";
next;
}
if (mw_push_revision($local, $remote)) {
$pushed = 1;
}
}
# Notify Git that the push is done
print {*STDOUT} "\n";
if ($pushed && $dumb_push) {
print {*STDERR} "Just pushed some revisions to MediaWiki.\n";
print {*STDERR} "The pushed revisions now have to be re-imported, and your current branch\n";
print {*STDERR} "needs to be updated with these re-imported commits. You can do this with\n";
print {*STDERR} "\n";
print {*STDERR} " git pull --rebase\n";
print {*STDERR} "\n";
}
return;
}
sub mw_push_revision {
my $local = shift;
my $remote = shift; # actually, this has to be "refs/heads/master" at this point.
my $last_local_revid = get_last_local_revision();
print {*STDERR} ".\n"; # Finish sentence started by get_last_local_revision()
my $last_remote_revid = get_last_remote_revision();
my $mw_revision = $last_remote_revid;
# Get sha1 of commit pointed by local HEAD
my $HEAD_sha1 = run_git_quoted_nostderr(["rev-parse", $local]);
chomp($HEAD_sha1);
# Get sha1 of commit pointed by remotes/$remotename/master
my $remoteorigin_sha1 = run_git_quoted_nostderr(["rev-parse", "refs/remotes/${remotename}/master"]);
chomp($remoteorigin_sha1);
if ($last_local_revid > 0 &&
$last_local_revid < $last_remote_revid) {
return error_non_fast_forward($remote);
}
if ($HEAD_sha1 eq $remoteorigin_sha1) {
# nothing to push
return 0;
}
# Get every commit in between HEAD and refs/remotes/origin/master,
# including HEAD and refs/remotes/origin/master
my @commit_pairs = ();
if ($last_local_revid > 0) {
my $parsed_sha1 = $remoteorigin_sha1;
# Find a path from last MediaWiki commit to pushed commit
print {*STDERR} "Computing path from local to remote ...\n";
my @local_ancestry = split(/\n/, run_git_quoted(["rev-list", "--boundary", "--parents", $local, "^${parsed_sha1}"]));
my %local_ancestry;
foreach my $line (@local_ancestry) {
if (my ($child, $parents) = $line =~ /^-?([a-f0-9]+) ([a-f0-9 ]+)/) {
foreach my $parent (split(/ /, $parents)) {
$local_ancestry{$parent} = $child;
}
} elsif (!$line =~ /^([a-f0-9]+)/) {
die "Unexpected output from git rev-list: ${line}\n";
}
}
while ($parsed_sha1 ne $HEAD_sha1) {
my $child = $local_ancestry{$parsed_sha1};
if (!$child) {
print {*STDERR} "Cannot find a path in history from remote commit to last commit\n";
return error_non_fast_forward($remote);
}
push(@commit_pairs, [$parsed_sha1, $child]);
$parsed_sha1 = $child;
}
} else {
# No remote mediawiki revision. Export the whole
# history (linearized with --first-parent)
print {*STDERR} "Warning: no common ancestor, pushing complete history\n";
my $history = run_git_quoted(["rev-list", "--first-parent", "--children", $local]);
my @history = split(/\n/, $history);
@history = @history[1..$#history];
foreach my $line (reverse @history) {
my @commit_info_split = split(/[ \n]/, $line);
push(@commit_pairs, \@commit_info_split);
}
}
foreach my $commit_info_split (@commit_pairs) {
my $sha1_child = @{$commit_info_split}[0];
my $sha1_commit = @{$commit_info_split}[1];
my $diff_infos = run_git_quoted(["diff-tree", "-r", "--raw", "-z", $sha1_child, $sha1_commit]);
# TODO: we could detect rename, and encode them with a #redirect on the wiki.
# TODO: for now, it's just a delete+add
my @diff_info_list = split(/\0/, $diff_infos);
# Keep the subject line of the commit message as mediawiki comment for the revision
my $commit_msg = run_git_quoted(["log", "--no-walk", '--format="%s"', $sha1_commit]);
chomp($commit_msg);
# Push every blob
while (@diff_info_list) {
my $status;
# git diff-tree -z gives an output like
# <metadata>\0<filename1>\0
# <metadata>\0<filename2>\0
# and we've split on \0.
my $info = shift(@diff_info_list);
my $file = shift(@diff_info_list);
($mw_revision, $status) = mw_push_file($info, $file, $commit_msg, $mw_revision);
if ($status eq 'non-fast-forward') {
# we may already have sent part of the
# commit to MediaWiki, but it's too
# late to cancel it. Stop the push in
# the middle, but still give an
# accurate error message.
return error_non_fast_forward($remote);
}
if ($status ne 'ok') {
die("Unknown error from mw_push_file()\n");
}
}
if (!$dumb_push) {
run_git_quoted(["notes", "--ref=${remotename}/mediawiki",
"add", "-f", "-m",
"mediawiki_revision: ${mw_revision}",
$sha1_commit]);
}
}
print {*STDOUT} "ok ${remote}\n";
return 1;
}
sub get_allowed_file_extensions {
$mediawiki = connect_maybe($mediawiki, $remotename, $url);
my $query = {
action => 'query',
meta => 'siteinfo',
siprop => 'fileextensions'
};
my $result = $mediawiki->api($query);
my @file_extensions = map { $_->{ext}} @{$result->{query}->{fileextensions}};
my %hashFile = map { $_ => 1 } @file_extensions;
return %hashFile;
}
# In memory cache for MediaWiki namespace ids.
my %namespace_id;
# Namespaces whose id is cached in the configuration file
# (to avoid duplicates)
my %cached_mw_namespace_id;
# Return MediaWiki id for a canonical namespace name.
# Ex.: "File", "Project".
sub get_mw_namespace_id {
$mediawiki = connect_maybe($mediawiki, $remotename, $url);
my $name = shift;
if (!exists $namespace_id{$name}) {
# Look at configuration file, if the record for that namespace is
# already cached. Namespaces are stored in form:
# "Name_of_namespace:Id_namespace", ex.: "File:6".
my @temp = split(/\n/,
run_git_quoted(["config", "--get-all", "remote.${remotename}.namespaceCache"]));
chomp(@temp);
foreach my $ns (@temp) {
my ($n, $id) = split(/:/, $ns);
if ($id eq 'notANameSpace') {
$namespace_id{$n} = {is_namespace => 0};
} else {
$namespace_id{$n} = {is_namespace => 1, id => $id};
}
$cached_mw_namespace_id{$n} = 1;
}
}
if (!exists $namespace_id{$name}) {
print {*STDERR} "Namespace ${name} not found in cache, querying the wiki ...\n";
# NS not found => get namespace id from MW and store it in
# configuration file.
my $query = {
action => 'query',
meta => 'siteinfo',
siprop => 'namespaces'
};
my $result = $mediawiki->api($query);
while (my ($id, $ns) = each(%{$result->{query}->{namespaces}})) {
if (defined($ns->{id}) && defined($ns->{canonical})) {
$namespace_id{$ns->{canonical}} = {is_namespace => 1, id => $ns->{id}};
if ($ns->{'*'}) {
# alias (e.g. french Fichier: as alias for canonical File:)
$namespace_id{$ns->{'*'}} = {is_namespace => 1, id => $ns->{id}};
}
}
}
}
my $ns = $namespace_id{$name};
my $id;
if (!defined $ns) {
my @namespaces = map { s/ /_/g; $_; } sort keys %namespace_id;
print {*STDERR} "No such namespace ${name} on MediaWiki, known namespaces: @namespaces\n";
$ns = {is_namespace => 0};
$namespace_id{$name} = $ns;
}
if ($ns->{is_namespace}) {
$id = $ns->{id};
}
# Store "notANameSpace" as special value for inexisting namespaces
my $store_id = ($id || 'notANameSpace');
# Store explicitly requested namespaces on disk
if (!exists $cached_mw_namespace_id{$name}) {
run_git_quoted(["config", "--add", "remote.${remotename}.namespaceCache", "${name}:${store_id}"]);
$cached_mw_namespace_id{$name} = 1;
}
return $id;
}
sub get_mw_namespace_id_for_page {
my $namespace = shift;
if ($namespace =~ /^([^:]*):/) {
return get_mw_namespace_id($namespace);
} else {
return;
}
}
