/usr/bin/pg_renamecluster is in postgresql-common 173ubuntu0.1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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 | #!/usr/bin/perl -wT
# Rename a PostgreSQL cluster
#
# (C) 2014-2015 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 PgCommon;
use Getopt::Long;
use POSIX;
# untaint environment
$ENV{'PATH'} = '/bin:/usr/bin';
delete @ENV{'IFS', 'CDPATH', 'ENV', 'BASH_ENV'};
if (@ARGV != 3) {
print "Usage: $0 [OPTIONS] <version> <old cluster name> <new cluster name>\n";
exit 1;
}
my ($version) = $ARGV[0] =~ /^(\d+\.\d+)$/;
my ($oldcluster) = $ARGV[1] =~ /^([-.\w]+)$/;
my ($newcluster) = $ARGV[2] =~ /^([-.\w]+)$/;
if ($newcluster =~ /-/ and -t 1) {
print "Warning: cluster names containing dashes (-) will cause problems when running from systemd. Continuing anyway\n";
}
error "Old and new name must be different"
if ($oldcluster eq $newcluster);
error "specified cluster $version $oldcluster does not exist"
unless (cluster_exists $version, $oldcluster);
error "target cluster $version $newcluster already exists"
if (cluster_exists $version, $newcluster);
my %info = cluster_info ($version, $oldcluster);
# stopping old cluster, so that we notice early when there are still
# connections
if ($info{'running'}) {
print "Stopping cluster $version $oldcluster ...\n";
my @argv = ('pg_ctlcluster', $version, $oldcluster, 'stop', '--');
push @argv, ('-t', '5') if $version >= '8.4';
error "Could not stop cluster" if system @argv;
}
# Arguments: <string>, <from>, <to>
sub strrepl {
my ($s, $f, $t) = @_;
$s =~ s/\b\Q$f\E\b/$t/g;
return $s;
}
# rename config directory
my $olddir = "$PgCommon::confroot/$version/$oldcluster";
my $newdir = "$PgCommon::confroot/$version/$newcluster";
rename $olddir, $newdir or error "Could not rename config directory $olddir: $!";
# adapt paths to configuration files
my %c = read_cluster_conf_file $version, $newcluster, 'postgresql.conf';
if ($c{hba_file}) {
PgCommon::set_conf_value $version, $newcluster, 'postgresql.conf', 'hba_file',
strrepl($c{hba_file}, $oldcluster, $newcluster);
}
if ($c{ident_file}) {
PgCommon::set_conf_value $version, $newcluster, 'postgresql.conf', 'ident_file',
strrepl($c{ident_file}, $oldcluster, $newcluster);
}
if ($c{external_pid_file}) {
PgCommon::set_conf_value $version, $newcluster, 'postgresql.conf', 'external_pid_file',
strrepl($c{external_pid_file}, $oldcluster, $newcluster);
}
# rename data directory
if ($info{pgdata}) {
my $newpgdata = strrepl ($info{pgdata}, $oldcluster, $newcluster);
if ($info{pgdata} ne $newpgdata) {
rename $info{pgdata}, $newpgdata or
error "Could not rename data directory $info{pgdata}: $!";
PgCommon::set_conf_value $version, $newcluster, 'postgresql.conf',
'data_directory', $newpgdata;
}
}
# rename stats_temp_directory
if ($info{statstempdir}) {
my $newstatstempdir = strrepl ($info{statstempdir}, $oldcluster, $newcluster);
if ($info{statstempdir} ne $newstatstempdir) {
PgCommon::set_conf_value $version, $newcluster, 'postgresql.conf',
'stats_temp_directory', $newstatstempdir;
if (-d $info{statstempdir}) {
rename $info{statstempdir}, $newstatstempdir or
error "Could not rename stats temp directory $info{statstempdir}: $!";
}
}
}
# rename old log files
my $logdir = "/var/log/postgresql";
if (opendir LOG, $logdir) {
while (my $logfile = readdir LOG) {
next unless $logfile =~ /^(\Qpostgresql-$version-$oldcluster.log\E.*)/;
$logfile = $1; # untaint
my $f = strrepl ($logfile, $oldcluster, $newcluster);
rename "$logdir/$logfile", "$logdir/$f" or error "rename $logdir/$logfile: $!";
}
closedir LOG;
}
# start cluster if it was running before
if ($info{'running'}) {
print "Starting cluster $version $newcluster ...\n";
my @argv = ('pg_ctlcluster', $version, $newcluster, 'start');
error "Could not start cluster" if system @argv;
}
__END__
=head1 NAME
pg_renamecluster - rename a PostgreSQL cluster
=head1 SYNOPSIS
B<pg_renamecluster> I<version> I<oldname> I<newname>
=head1 DESCRIPTION
B<pg_renamecluster> changes the name of a PostgreSQL cluster, i. e. the name of
the config directory in /etc/postgresql/I<version>/ along with the data
directory in /var/lib/postgresql/I<version>/. Existing log files in
/var/log/postgresql/ are also renamed. The cluster is stopped and started for
the operation.
The following B<postgresql.conf> config options are updated to refer to the
changed path names: B<data_directory>, B<hba_file>, B<ident_file>,
B<external_pid_file>, B<stats_temp_directory>.
Cluster names are a Debian convention, the name is not explicitly known to the
cluster itself. From the PostgreSQL viewpoint, the name is merely a substring
of various path names.
=head1 OPTIONS
None.
=head1 SEE ALSO
L<pg_createcluster(8)>, L<pg_dropcluster(8)>, L<pg_lsclusters(1)>, L<pg_wrapper(1)>
=head1 AUTHOR
Christoph Berg L<E<lt>myon@debian.orgE<gt>>
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