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-rwxr-xr-xpg_dropcluster226
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+#!/usr/bin/perl -wT
+
+# Completely delete a PostgreSQL cluster. Fails if there is still a server
+# process attached.
+#
+# (C) 2005-2009 Martin Pitt <mpitt@debian.org>
+# (C) 2015-2021 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 Getopt::Long;
+use PgCommon;
+
+# untaint environment
+$ENV{'PATH'} = '/bin:/usr/bin';
+delete @ENV{'IFS', 'CDPATH', 'ENV', 'BASH_ENV'};
+
+my $stopserver = 0;
+exit 1 unless GetOptions ('stop-server' => \$stopserver, 'stop' => \$stopserver);
+
+# command line options
+if ($#ARGV != 1) {
+ print "Usage: $0 [--stop] <version> <cluster>\n";
+ exit 1;
+}
+
+my ($version) = $ARGV[0] =~ /^(\d+\.?\d+)$/;
+my ($cluster) = $ARGV[1] =~ /^([-.\w]+)$/;
+error 'invalid version' unless defined $version;
+error 'invalid cluster name' unless defined $cluster;
+
+my %info;
+my $c; # configuration directory
+my $startconf;
+
+if (cluster_exists $version, $cluster) {
+ %info = cluster_info ($version, $cluster);
+ validate_cluster_owner \%info if ($info{pgdata} && -d $info{pgdata}); # ignore missing data directory
+
+ if ($info{'running'}) {
+ if ($stopserver) {
+ if ($info{'pgdata'} && -d $info{'pgdata'}) {
+ if (system ('pg_ctlcluster', $version, $cluster, 'stop')) {
+ error 'could not stop server, aborting';
+ }
+ } else {
+ print STDERR "Warning: corrupted cluster: data directory does not exist any more, but server is still running; you have to manually kill the postgres process\n";
+ }
+ } else {
+ error 'This cluster is still running. Stop it or supply the --stop option';
+ }
+ }
+ $c = $info{'configdir'};
+ $startconf = $info{'start'};
+} else {
+ $c = "/etc/postgresql/$version/$cluster";
+
+ # check if we have a broken cluster, clean up if necessary
+ -d $c or error 'specified cluster does not exist';
+}
+
+# disable systemd-enabled clusters
+if (not exists $ENV{'PG_CLUSTER_CONF_ROOT'} and -d '/run/systemd/system') {
+ if ($> == 0) {
+ system "systemctl", "disable", "postgresql\@$version-$cluster";
+ system "systemctl", "disable", "--now", "pg_receivewal\@$version-$cluster";
+ system "systemctl", "disable", "--now", "pg_basebackup\@$version-$cluster.timer";
+ system "systemctl", "disable", "--now", "pg_dump\@$version-$cluster.timer";
+ }
+}
+
+if ($info{'pgdata'} && -d $info{'pgdata'}) {
+ # remove custom wal directory
+ if ($info{waldir} and -d $info{waldir}) {
+ my $walowner = (stat($info{waldir}))[4];
+ if (defined $walowner and $walowner == $info{owneruid}) {
+ my $result = system 'rm', '-r', '--', $info{waldir};
+ if ($result) {
+ print STDERR "Warning: could not remove wal directory $info{waldir}";
+ }
+ } else {
+ print STDERR "Warning: wal directory $info{waldir} is not owned by uid $info{owneruid}, not removing\n";
+ }
+ }
+
+ # remove tablespace subdirectories that belong to our version
+ for my $link (glob "$info{pgdata}/pg_tblspc/*") {
+ next unless (-l $link);
+ my $tblspc = readlink $link;
+ my $tblspcowner = (stat($tblspc))[4];
+ if (defined $tblspcowner and $tblspcowner == $info{owneruid}) {
+ if ($version >= 9.0) {
+ for my $dir (glob "$tblspc/PG_${version}_*") {
+ my $dirowner = (stat($dir))[4];
+ if (defined $dirowner and $dirowner == $info{owneruid}) {
+ my $result = system 'rm', '-r', '--', ($dir =~ /(.*)/); # untaint
+ if ($result) {
+ print STDERR "Warning: could not remove tablespace directory $dir";
+ }
+ } else {
+ print STDERR "Warning: tablespace subdirectory $dir (in tablespace linked from $link) is not owned by uid $info{owneruid}, not removing\n";
+ }
+ }
+ } else { # before 9.0
+ if (open my $fh, '<', "$tblspc/PG_VERSION") {
+ my $v = <$fh>;
+ chomp $v;
+ close $fh;
+ if ($v eq $version) {
+ $tblspc =~ /(.*)/; # untaint
+ my $result = system "rm -r -- $1/*";
+ } else {
+ print STDERR "Warning: tablespace directory $tblspc (linked from $link) is from PostgreSQL version $v, not removing\n";
+ }
+ } else {
+ print STDERR "Warning: tablespace directory $tblspc (linked from $link) is not a PostgreSQL directory, not removing\n";
+ }
+ }
+ } else {
+ print STDERR "Warning: tablespace directory $tblspc (linked from $link) is not owned by uid $info{owneruid}, not considering\n";
+ }
+ }
+
+ # remove pgdata
+ my $result = system 'rm', '-r', $info{'pgdata'};
+ if ($result) {
+ if (! -w ($info{'pgdata'} . '/..')) {
+ error 'you might need to run this program with root privileges';
+ }
+ exit $result;
+ }
+} else {
+ print STDERR "Warning: corrupted cluster: data directory does not exist\n";
+}
+
+# remove config
+unlink $c.'/pg_hba.conf', $c.'/pg_ident.conf', $c.'/postgresql.conf',
+ $c.'/start.conf', $c.'/log', $c.'/autovacuum_log', $c.'/pgdata',
+ $c.'/environment', $c.'/pg_ctl.conf';
+rmdir $_ foreach (map { /(.*)/ && $1 } glob "$c/*"); # remove empty conf.d directories
+
+unlink $info{'logfile'} if defined ($info{'logfile'});
+if ($info{'socketdir'} and $info{'socketdir'} !~ /^(\/tmp|\/var\/run\/postgresql)\/?$/) {
+ rmdir $info{'socketdir'};
+}
+rmdir $c;
+rmdir "/etc/postgresql/$version";
+rmdir "/var/lib/postgresql/$version/$cluster";
+rmdir "/var/lib/postgresql/$version";
+unlink "/var/log/postgresql/postgresql-$version-$cluster.log";
+# remove logrotated files
+foreach my $f (</var/log/postgresql/postgresql-$version-$cluster.log.[1-9]*>) {
+ unlink ($f =~ /(.*)/); # untaint
+}
+
+# remove stats_temp_directory
+my $statstempdir = $info{config}->{stats_temp_directory};
+if ($statstempdir) {
+ my $statsowner = (stat($statstempdir))[4];
+ if (defined $statsowner and defined $info{owneruid} and $statsowner == $info{owneruid}) {
+ foreach my $f (<$statstempdir/*.stat>) {
+ unlink ($f =~ /(.*)/); # untaint
+ }
+ rmdir $statstempdir;
+ }
+}
+
+# notify systemd when an autostarted cluster went away
+if (not exists $ENV{'PG_CLUSTER_CONF_ROOT'} and $startconf and $startconf eq 'auto' and -d '/run/systemd/system') {
+ if ($> == 0) {
+ system 'systemctl daemon-reload';
+ } elsif (-t 1) {
+ print "Warning: systemd was not informed about the removed cluster yet. Operations like \"service postgresql start\" might fail. To fix, run:\n";
+ print " sudo systemctl daemon-reload\n";
+ }
+}
+
+# notify apt about the new cluster
+if (not exists $ENV{'PG_CLUSTER_CONF_ROOT'} and $> == 0) {
+ system "/usr/share/postgresql-common/pg_updateaptconfig";
+}
+
+exit 0;
+
+__END__
+
+=head1 NAME
+
+pg_dropcluster - completely delete a PostgreSQL cluster
+
+=head1 SYNOPSIS
+
+B<pg_dropcluster> [B<--stop>] I<cluster-version> I<cluster-name>
+
+=head1 DESCRIPTION
+
+This program removes all files that belong to a given PostgreSQL cluster; that
+includes the data, wal, and tablespace directories, the log file, and all configuration files that
+were created by L<pg_createcluster(1)>. If the configuration directory
+(C</etc/postgresql/>I<version>C</>I<cluster>) is empty after this, it is
+removed as well.
+An empty socket directory other than B</var/run/postgresql> or B</tmp> is
+also removed.
+
+Usually a cluster which still has a running server attached will not be
+deleted. To override this, the B<--stop> option forces a server shutdown
+before the files are removed.
+
+=head1 SEE ALSO
+
+L<pg_createcluster(1)>, L<pg_ctlcluster(1)>
+
+=head1 AUTHOR
+
+Martin Pitt L<E<lt>mpitt@debian.orgE<gt>>
+