Adding upstream version 248.upstream/248upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 435 insertions, 0 deletions

diff --git a/pg_restorecluster b/pg_restorecluster
new file mode 100755
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+++ b/pg_restorecluster
@@ -0,0 +1,435 @@
+#!/usr/bin/perl -wT
+
+# pg_restorecluster: restore from a pg_backupcluster backup
+#
+# Copyright (C) 2021 Christoph Berg <myon@debian.org>
+#
+#  This program is free software; you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation; either version 2 of the License, or
+#  (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+
+use strict;
+use warnings;
+use Cwd 'abs_path';
+use Getopt::Long;
+use PgCommon;
+
+my ($version, $cluster);
+
+# untaint environment
+$ENV{'PATH'} = '/sbin:/bin:/usr/sbin:/usr/bin';
+delete @ENV{'IFS', 'CDPATH', 'ENV', 'BASH_ENV'};
+umask 022;
+
+sub help () {
+    print "Syntax: $0 [options] <version> <cluster> <backup>
+Options:
+  -d --datadir DIR  Data directory for restored cluster (default per createcluster.conf)
+  -p --port PORT    Use port PORT for restored cluster (default is next free port)
+  -s --start        Start cluster after restoring (default for restore from dump)
+     --archive      Configure recovery from WAL archive
+     --pitr TIMEST  Configure point-in-time recovery to TIMESTAMP from WAL archive
+     --wal-archive DIR  Read WAL from archive DIR (default <backup>/../wal)
+";
+}
+
+my $createclusterconf = "$PgCommon::common_confdir/createcluster.conf";
+my ($datadir, $port, $start, $recovery_target_time, $archive_recovery, $wal_archive);
+
+exit 1 unless GetOptions (
+    'd|datadir=s' => \$datadir,
+    'p|port=s' => \$port,
+    's|start' => \$start,
+    'archive' => \$archive_recovery,
+    'pitr=s' => \$recovery_target_time,
+    'recovery-target-time=s' => \$recovery_target_time,
+    'wal-archive=s' => \$wal_archive,
+    'createclusterconf=s' => \$createclusterconf,
+);
+if ($recovery_target_time) {
+    ($recovery_target_time) = $recovery_target_time =~ /(.*)/; # untaint
+}
+
+# accept both "version cluster" and "version[-/]cluster"
+if (@ARGV >= 2 and $ARGV[0] =~ m!^(\d+\.?\d)[-/]([^/]+)$!) {
+    ($version, $cluster) = ($1, $2);
+    shift @ARGV;
+} elsif (@ARGV >= 3 and $ARGV[0] =~ /^(\d+\.?\d)$/) {
+    $version = $1;
+    ($cluster) = ($ARGV[1]) =~ m!^([^/]+)$!;
+    shift @ARGV;
+    shift @ARGV;
+} else {
+    help();
+    exit 1;
+}
+
+error "cluster $version $cluster already exists" if cluster_exists $version, $cluster;
+
+my %defaultconf = PgCommon::read_conf_file ($createclusterconf);
+
+# functions to be run as root
+
+sub create_cluster_directories($$$$) {
+    my ($owneruid, $ownergid, $configdir, $datadir) = @_;
+    my @postgres_user = getpwnam 'postgres';
+    my ($pg_uid, $pg_gid) = (getpwnam 'postgres')[2, 3];
+
+    for my $pgdir ("/etc/postgresql", "/etc/postgresql/$version", "/var/lib/postgresql", "/var/lib/postgresql/$version") {
+        if (! -e $pgdir) {
+            mkdir $pgdir or error "mkdir $pgdir: $!";
+            chown $pg_uid, $pg_gid, $pgdir or error "chown $pgdir: $!";
+        }
+    }
+    mkdir $configdir or error "mkdir $configdir: $!";
+    chown $owneruid, $ownergid, $configdir or error "chown $configdir: $!";
+    mkdir $datadir, 0700 or error "mkdir $datadir: $!";
+    chown $owneruid, $ownergid, $datadir or error "chown $datadir: $!";
+}
+
+sub create_cluster($$$$$) {
+    my ($backup, $owneruid, $ownergid, $configdir, $datadir) = @_;
+
+    my @createclusteropts = ();
+    if (-f "$backup/createcluster.opts") {
+        open my $fh, "$backup/createcluster.opts" or error "$backup/createcluster.opts: $!";
+        local $/; # slurp mode
+        my ($opts) = <$fh> =~ /(.*)/; # untaint
+        @createclusteropts = split /\s+/, $opts;
+        close $fh;
+    }
+
+    system_or_error "pg_createcluster",
+        "--datadir", $datadir,
+        "--user", $owneruid, "--group", $ownergid,
+        $version, $cluster,
+        @createclusteropts;
+}
+
+sub start_cluster() {
+    print "Starting cluster $version $cluster ...\n";
+    system_or_error "pg_ctlcluster", $version, $cluster, "start";
+}
+
+sub switch_to_cluster_owner($$) {
+    my ($owneruid, $ownergid) = @_;
+    change_ugid $owneruid, $ownergid;
+}
+
+# restore functions
+
+sub unpack_tar($$$) {
+    my ($backup, $tar, $dir) = @_;
+
+    if (-f "$backup/$tar.gz") {
+        $tar = "$tar.gz";
+    } elsif (-f "$backup/$tar.bz2") {
+        $tar = "$tar.bz2";
+    } elsif (-f "$backup/$tar.xz") {
+        $tar = "$tar.xz";
+    } elsif (-f "$backup/$tar") {
+        # do nothing
+    } else {
+        error "$backup/config.tar* is missing";
+    }
+
+    print "Restoring $backup/$tar to $dir ...\n";
+    system_or_error "tar", "-C", $dir, "-xf", "$backup/$tar";
+}
+
+sub restore_config($$) {
+    my ($backup, $configdir) = @_;
+    unpack_tar($backup, "config.tar", $configdir);
+}
+
+sub update_config($$$) {
+    my ($configdir, $datadir, $port) = @_;
+    my %settings = (
+        data_directory => $datadir,
+        hba_file => "$configdir/pg_hba.conf",
+        ident_file => "$configdir/pg_ident.conf",
+        external_pid_file => "/var/run/postgresql/$version-$cluster.pid",
+        port => $port,
+    );
+    $settings{cluster_name} = "$version/$cluster" if ($version >= 9.5);
+    $settings{stats_temp_directory} = "/var/run/postgresql/$version-$cluster.pg_stat_tmp" if ($version < 15);
+    my %config = PgCommon::read_conf_file("$configdir/postgresql.conf");
+    for my $guc (sort keys %settings) {
+        if (not exists $config{$guc} or $config{$guc} ne $settings{$guc}) {
+            print "Setting $guc = $settings{$guc}\n";
+            PgCommon::set_conffile_value("$configdir/postgresql.conf", $guc, $settings{$guc});
+        }
+    }
+}
+
+sub restore_basebackup($$) {
+    my ($backup, $datadir) = @_;
+    unpack_tar($backup, "base.tar", $datadir);
+}
+
+sub restore_wal($$) {
+    my ($backup, $datadir) = @_;
+    return if ($version < 10); # WAL contained in base.tar.gz in PG 9.x
+    unpack_tar($backup, "pg_wal.tar", "$datadir/pg_wal");
+}
+
+sub archive_recovery_options($$$) {
+    my ($backup, $datadir, $wal_archive) = @_;
+
+    $wal_archive = abs_path($wal_archive) or error "$wal_archive: $!";
+    -d $wal_archive or error "$wal_archive is not a directory";
+
+    print "Setting archive recovery options";
+    my $recovery_options = "restore_command = '/usr/share/postgresql-common/pg_getwal $wal_archive/%f %p'\n";
+    if ($recovery_target_time) {
+        $recovery_options .= "recovery_target_time = '$recovery_target_time'\n";
+        $recovery_options .= "recovery_target_action = 'promote'\n";
+    }
+
+    if ($version >= 12) {
+        my $autoconf = "$datadir/postgresql.auto.conf";
+        open my $fh, ">>", $autoconf or error "$autoconf: $!";
+        print $fh $recovery_options or error "$autoconf: $!";
+        close $fh or error "$autoconf: $!";
+
+        my $recoverysignal = "$datadir/recovery.signal";
+        open my $fh2, ">", $recoverysignal or error "$recoverysignal: $!";
+        close $fh2 or error "$recoverysignal: $!";
+
+    } else {
+        my $recoveryconf = "$datadir/recovery.conf";
+        open my $fh, ">>", $recoveryconf or error "$recoveryconf: $!";
+        print $fh $recovery_options or error "$recoveryconf: $!";
+        close $fh or error "$recoveryconf: $!";
+    }
+}
+
+sub reset_archive_recovery_options() {
+    if ($version >= 12) {
+        system_or_error "psql",
+            "--cluster", "$version/$cluster",
+            "-XAtqc", "ALTER SYSTEM RESET restore_command";
+        system_or_error "psql",
+            "--cluster", "$version/$cluster",
+            "-XAtqc", "ALTER SYSTEM RESET recovery_target_time"
+                if ($recovery_target_time);
+        system_or_error "psql",
+            "--cluster", "$version/$cluster",
+            "-XAtqc", "ALTER SYSTEM RESET recovery_target_action"
+                if ($recovery_target_time);
+    }
+}
+
+sub restore_globals($$) {
+    my ($backup, $owneruid) = @_;
+    my $owner = (getpwuid $owneruid)[0] or error "UID $owneruid has no name";
+
+    print "Restoring $backup/globals.sql ...\n";
+    open my $globals, "$backup/globals.sql" or error "$backup/globals.sql: $!";
+    open my $psql, "|-", "psql", "--cluster", "$version/$cluster", "-vON_ERROR_STOP=1", "-Xq" or error "psql: $!";
+    while (my $line = <$globals>) {
+        next if ($line eq "CREATE ROLE $owner;\n");
+        print $psql $line or error "psql: $!";
+    }
+    close $globals;
+    close $psql;
+    error "psql failed" if ($?);
+}
+
+sub create_databases($) {
+    my ($backup) = @_;
+
+    print "Creating databases from $backup/databases.sql ...\n";
+    system_or_error "psql", "--cluster", "$version/$cluster", "-vON_ERROR_STOP=1", "-Xqf", "$backup/databases.sql";
+}
+
+sub restore_dumps($) {
+    my ($backup) = @_;
+
+    for my $dump (sort glob "$backup/*.dump") {
+        $dump =~ m!(.*/([^/]*).dump)$!;
+        $dump = $1; # untaint
+        my $db = $2;
+        print "Restoring $dump to database $db ...\n";
+        system_or_error "pg_restore", "--cluster", "$version/$cluster", "-d", $db, $dump;
+    }
+}
+
+sub wait_for_recovery() {
+    my $sleep = 1;
+
+    print "Waiting for end of recovery ...\n";
+    while (1) {
+        open my $psql, "-|", "psql", "--cluster", "$version/$cluster", "-XAtc", "SELECT pg_is_in_recovery()" or error "psql: $!";
+        my $status = <$psql>;
+        error "psql: $!" unless (defined $status);
+        close $psql or error "psql: $!";
+        last if ($status eq "f\n");
+        sleep($sleep++);
+    }
+}
+
+sub analyze() {
+    system_or_error "vacuumdb",
+        "--cluster", "$version/$cluster",
+        "--analyze-only",
+        ($version >= 9.4 ? "--analyze-in-stages" : ()),
+        "--all";
+}
+
+sub lscluster() {
+    system_or_error "pg_lsclusters", $version, $cluster;
+}
+
+# main
+
+my ($backup) = $ARGV[0] =~ /(.*)/; # untaint
+error "$backup is not a directory" unless (-d $backup);
+$backup =~ s/\/$//; # strip trailing slash
+my ($owneruid, $ownergid) = (stat $backup)[4, 5];
+my $configdir = "/etc/postgresql/$version/$cluster";
+$datadir //= replace_v_c($defaultconf{data_directory} // "/var/lib/postgresql/%v/%c", $version, $cluster);
+($datadir) = $datadir =~ /(.*)/; # untaint
+$wal_archive //= "$backup/../wal";
+$port //= next_free_port();
+
+if ($backup =~ /\.backup$/) {
+    create_cluster_directories($owneruid, $ownergid, $configdir, $datadir);
+    if (fork == 0) {
+        switch_to_cluster_owner($owneruid, $ownergid);
+        restore_config($backup, $configdir);
+        update_config($configdir, $datadir, $port);
+        restore_basebackup($backup, $datadir);
+        restore_wal($backup, $datadir);
+        archive_recovery_options($backup, $datadir, $wal_archive)
+            if ($archive_recovery or $recovery_target_time);
+        exit(0);
+    }
+    wait;
+    exit(1) if ($?);
+    if ($start) {
+        print "\n";
+        start_cluster();
+        switch_to_cluster_owner($owneruid, $ownergid);
+        wait_for_recovery();
+        reset_archive_recovery_options() if ($archive_recovery or $recovery_target_time);
+        analyze();
+    }
+    print "\n";
+    lscluster();
+
+} elsif ($backup =~ /\.dump$/) {
+    create_cluster($backup, $owneruid, $ownergid, $configdir, $datadir);
+    print "\n";
+    if (fork == 0) {
+        switch_to_cluster_owner($owneruid, $ownergid);
+        restore_config($backup, $configdir);
+        update_config($configdir, $datadir, $port);
+        exit(0);
+    }
+    wait;
+    exit(1) if ($?);
+    start_cluster();
+    switch_to_cluster_owner($owneruid, $ownergid);
+    restore_globals($backup, $owneruid);
+    create_databases($backup);
+    restore_dumps($backup);
+    analyze();
+    print "\n";
+    lscluster();
+
+} else {
+    error "$backup must end in either .backup or .dump";
+}
+
+__END__
+
+=head1 NAME
+
+pg_restorecluster - Restore from a pg_backupcluster backup
+
+=head1 SYNOPSIS
+
+B<pg_restorecluster> [I<options>] I<version> I<cluster> I<backup>
+
+=head1 DESCRIPTION
+
+B<pg_restorecluster> restores a PostgreSQL cluster from a backup created by
+B<pg_backupcluster>. The cluster will be newly created in the system using the
+name provided on the command line; this allows renaming a cluster on restore.
+The restored cluster configuration will be updated to reflect the new name and
+location.
+
+The I<backup> name passed must end in either B<.basebackup> or B<.dump>;
+usually this will be the full path to a backup directory in
+C</var/backups/postgresql/version-cluster/> as reported by
+B<pg_backupcluster ... list>.
+
+Basebackups are restored as-is. For dumps, B<pg_createcluster> is used to
+create a new cluster, and schema and data are restored via B<pg_restore>.
+
+=head1 OPTIONS
+
+=over 4
+
+=item B<-d --datadir> I<DIR>
+
+Use I<DIR> as data directory for the restored cluster (default per
+createcluster.conf, by default /var/lib/postgresql/I<version>/I<cluster>).
+
+=item B<-p --port> I<N>
+
+Use port I<N> for restored cluster (default is next free port).
+
+=item B<-s --start>
+
+Start cluster after restoring (default for restore from dump; off for
+basebackup restores).
+
+After the cluster has been started, B<ANALYZE> is run on all databases.
+
+=item B<--archive>
+
+Configure cluster for recovery from WAL archive. This sets B<restore_command>
+to retrieve WAL files from I<backup>B</../wal>.
+
+=item B<--pitr> I<TIMESTAMP>
+
+=item B<--recovery-target-time> I<TIMESTAMP>
+
+Additionally to setting B<restore_command>, set B<recovery_target_time> to
+I<TIMESTAMP> for point-in-time recovery. Also sets
+B<recovery_target_action='promote'>.
+
+=item B<--wal-archive> I<DIR>
+
+For archive recovery, read WAL from archive I<DIR> (default is
+I<backup>B</../wal>).
+
+=back
+
+=head1 FILES
+
+=over 4
+
+=item /var/backups
+
+Default root directory for cluster backup directories.
+
+=back
+
+See L<pg_backupcluster(1)> for a description of files.
+
+=head1 SEE ALSO
+
+L<pg_backupcluster(1)>, L<pg_restore(1)>, L<vacuumdb(1)>.
+
+=head1 AUTHOR
+
+Christoph Berg L<E<lt>myon@debian.orgE<gt>>