user/dev discussion of public-inbox itself
 help / color / Atom feed
4555340a6d7e8b2fd0eed01a4258074c07c5a167 blob 5909 bytes (raw)

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
 
# Copyright (C) 2018-2019 all contributors <meta@public-inbox.org>
# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
package PublicInbox::Xapcmd;
use strict;
use warnings;
use PublicInbox::Spawn qw(which spawn);
use PublicInbox::Over;
use PublicInbox::Search;
use File::Temp qw(tempdir);
use File::Path qw(remove_tree);

# support testing with dev versions of Xapian which installs
# commands with a version number suffix (e.g. "xapian-compact-1.5")
our $XAPIAN_COMPACT = $ENV{XAPIAN_COMPACT} || 'xapian-compact';

sub commit_changes ($$$$) {
	my ($ibx, $old, $new, $opt) = @_;

	my $reindex = $opt->{reindex};
	my $im = $ibx->importer(0);
	$im->lock_acquire if $reindex;

	my @st = stat($old) or die "failed to stat($old): $!\n";

	my $over = "$old/over.sqlite3";
	if (-f $over) {
		$over = PublicInbox::Over->new($over);
		$over->connect->sqlite_backup_to_file("$new/over.sqlite3");
		$over = undef;
	}
	rename($old, "$new/old") or die "rename $old => $new/old: $!\n";
	chmod($st[2] & 07777, $new) or die "chmod $old: $!\n";
	rename($new, $old) or die "rename $new => $old: $!\n";
	remove_tree("$old/old") or die "failed to remove $old/old: $!\n";

	if ($reindex) {
		$opt->{-skip_lock} = 1;
		PublicInbox::Admin::index_inbox($ibx, $opt);
		# implicit lock_release
	} else {
		$im->lock_release;
	}
}

sub xspawn {
	my ($cmd, $env, $opt) = @_;
	if (ref($cmd->[0]) eq 'CODE') {
		my $cb = shift(@$cmd); # $cb = cpdb()
		defined(my $pid = fork) or die "fork: $!";
		return $pid if $pid > 0;
		eval { $cb->($cmd, $env, $opt) };
		die $@ if $@;
		exit 0;
	} else {
		spawn($cmd, $env, $opt);
	}
}

sub runnable_or_die ($) {
	my ($exe) = @_;
	which($exe) or die "$exe not found in PATH\n";
}

sub prepare_reindex ($$) {
	my ($ibx, $reindex) = @_;
	if ($ibx->{version} == 1) {
		my $dir = $ibx->search->xdir(1);
		my $xdb = Search::Xapian::Database->new($dir);
		if (my $lc = $xdb->get_metadata('last_commit')) {
			$reindex->{from} = $lc;
		}
	} else { # v2
		my $v2w = $ibx->importer(0);
		my $max;
		$v2w->git_dir_latest(\$max) or return;
		my $from = $reindex->{from};
		my $mm = $ibx->mm;
		my $v = PublicInbox::Search::SCHEMA_VERSION();
		foreach my $i (0..$max) {
			$from->[$i] = $mm->last_commit_xap($v, $i);
		}
	}
}

sub run {
	my ($ibx, $cmd, $env, $opt) = @_;
	$opt ||= {};
	my $dir = $ibx->{mainrepo} or die "no mainrepo in inbox\n";
	my $exe = $cmd->[0];
	my $pfx = $exe;
	runnable_or_die($XAPIAN_COMPACT) if $opt->{compact};

	my $reindex; # v1:{ from => $x40 }, v2:{ from => [ $x40, $x40, .. ] } }
	my $from; # per-epoch ranges

	if (ref($exe) eq 'CODE') {
		$pfx = 'CODE';
		$reindex = $opt->{reindex} = {};
		$from = $reindex->{from} = [];
		require Search::Xapian::WritableDatabase;
	} else {
		runnable_or_die($exe);
	}
	$ibx->umask_prepare;
	my $old = $ibx->search->xdir(1);
	-d $old or die "$old does not exist\n";
	my $new = tempdir("$pfx-XXXXXXXX", DIR => $dir);
	my $v = $ibx->{version} ||= 1;
	my @cmds;
	if ($v == 1) {
		push @cmds, [@$cmd, $old, $new];
	} else {
		opendir my $dh, $old or die "Failed to opendir $old: $!\n";
		while (defined(my $dn = readdir($dh))) {
			if ($dn =~ /\A\d+\z/) {
				push @cmds, [@$cmd, "$old/$dn", "$new/$dn"];
			} elsif ($dn eq '.' || $dn eq '..') {
			} elsif ($dn =~ /\Aover\.sqlite3/) {
			} else {
				warn "W: skipping unknown dir: $old/$dn\n"
			}
		}
		die "No Xapian parts found in $old\n" unless @cmds;
	}
	my $im = $ibx->importer(0);
	my $max = $opt->{jobs} || scalar(@cmds);
	$ibx->with_umask(sub {
		$im->lock_acquire;

		# fine-grained locking if we prepare for reindex
		if ($reindex) {
			prepare_reindex($ibx, $reindex);
			$im->lock_release;
		}
		delete($ibx->{$_}) for (qw(mm over search)); # cleanup
		my %pids;
		while (@cmds) {
			while (scalar(keys(%pids)) < $max && scalar(@cmds)) {
				my $x = shift @cmds;
				$pids{xspawn($x, $env, $opt)} = $x;
			}

			while (scalar keys %pids) {
				my $pid = waitpid(-1, 0);
				my $x = delete $pids{$pid};
				die join(' ', @$x)." failed: $?\n" if $?;
			}
		}
		commit_changes($ibx, $old, $new, $opt);
	});
}

sub cpdb_retryable ($$) {
	my ($src, $err) = @_;
	if (ref($err) eq 'Search::Xapian::DatabaseModifiedError') {
		warn "$err, reopening and retrying\n";
		$src->reopen;
		return 1;
	}
	die $err if $err;
	0;
}

sub cpdb {
	my ($args, $env, $opt) = @_;
	my ($old, $new) = @$args;
	my $src = Search::Xapian::Database->new($old);
	my $tmp = $opt->{compact} ? "$new.compact" : $new;

	# like copydatabase(1), be sure we don't overwrite anything in case
	# of other bugs:
	my $creat = Search::Xapian::DB_CREATE();
	my $dst = Search::Xapian::WritableDatabase->new($tmp, $creat);
	my ($it, $end);

	do {
		eval {
			# update the only metadata key for v1:
			my $lc = $src->get_metadata('last_commit');
			$dst->set_metadata('last_commit', $lc) if $lc;

			$it = $src->postlist_begin('');
			$end = $src->postlist_end('');
		};
	} while (cpdb_retryable($src, $@));

	do {
		eval {
			while ($it != $end) {
				my $docid = $it->get_docid;
				my $doc = $src->get_document($docid);
				$dst->replace_document($docid, $doc);
				$it->inc;
			}

			# unlike copydatabase(1), we don't copy spelling
			# and synonym data (or other user metadata) since
			# the Perl APIs don't expose iterators for them
			# (and public-inbox does not use those features)
		};
	} while (cpdb_retryable($src, $@));

	return unless $opt->{compact};

	$src = $dst = undef; # flushes and closes

	# this is probably the best place to do xapian-compact
	# since $dst isn't readable by HTTP or NNTP clients, yet:
	my $cmd = [ $XAPIAN_COMPACT, '--no-renumber', $tmp, $new ];
	my $rdr = {};
	foreach my $fd (0..2) {
		defined(my $dst = $opt->{$fd}) or next;
		$rdr->{$fd} = $dst;
	}
	my $pid = spawn($cmd, $env, $rdr);
	my $r = waitpid($pid, 0);
	if ($? || $r != $pid) {
		die join(' ', @$cmd)." failed: $? (pid=$pid, reaped=$r)\n";
	}
	remove_tree($tmp) or die "failed to remove $tmp: $!\n";
}

1;
debug log:

solving 4555340 ...
found 4555340 in https://80x24.org/public-inbox.git

user/dev discussion of public-inbox itself

Archives are clonable:
	git clone --mirror https://public-inbox.org/meta
	git clone --mirror http://czquwvybam4bgbro.onion/meta
	git clone --mirror http://hjrcffqmbrq6wope.onion/meta
	git clone --mirror http://ou63pmih66umazou.onion/meta

Example config snippet for mirrors

Newsgroups are available over NNTP:
	nntp://news.public-inbox.org/inbox.comp.mail.public-inbox.meta
	nntp://ou63pmih66umazou.onion/inbox.comp.mail.public-inbox.meta
	nntp://czquwvybam4bgbro.onion/inbox.comp.mail.public-inbox.meta
	nntp://hjrcffqmbrq6wope.onion/inbox.comp.mail.public-inbox.meta
	nntp://news.gmane.org/gmane.mail.public-inbox.general

 note: .onion URLs require Tor: https://www.torproject.org/

AGPL code for this site: git clone https://public-inbox.org/public-inbox.git