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#!/usr/bin/perl # Call a PostgreSQL client program with the version, cluster and default # database specified in ~/.postgresqlrc or # /etc/postgresql-common/user_clusters. # # (C) 2005-2009 Martin Pitt <mpitt@debian.org> # (C) 2013-2022 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 warnings; use strict; use POSIX; use PgCommon; my ($version, $cluster); my $explicit_host = exists $ENV{PGHOST}; my $explicit_port = $ENV{PGPORT}; my $explicit_service = exists $ENV{PGSERVICE}; # Evaluate PGCLUSTER (unless PGHOST is set as well) if (exists $ENV{'PGCLUSTER'} and not $explicit_host) { ($version, $cluster) = split ('/', $ENV{'PGCLUSTER'}, 2); error "Invalid version $version specified in PGCLUSTER" unless version_exists $version; error 'No cluster specified with $PGCLUSTER' unless $cluster; } # Check for --cluster argument and filter it out for (my $i = 0; $i <= $#ARGV; ++$i) { last if $ARGV[$i] eq '--'; if ($ARGV[$i] eq '--cluster') { error '--cluster option needs an argument (<version>/<cluster>)' if ($i >= $#ARGV); ($version, $cluster) = split ('/', $ARGV[$i+1], 2); error "Invalid version $version specified with --cluster" unless version_exists $version; error 'No cluster specified with --cluster' unless $cluster; splice @ARGV, $i, 2; last; } elsif ($ARGV[$i] =~ /^--cluster=(\d+\.?\d)\/(.+)/) { ($version, $cluster) = ($1, $2); error "Invalid version $version specified with --cluster" unless version_exists $version; error 'No cluster specified with --cluster' unless $cluster; splice @ARGV, $i, 1; last; } # --host or -h on command line, drop info from PGCLUSTER if ($ARGV[$i] =~ /^--host\b/ || $ARGV[$i] =~ /^-\w*h\w*$/) { ($version, $cluster) = (undef, undef); $explicit_host = 1; delete $ENV{PGCLUSTER}; } # --port or -p on command line if ($ARGV[$i] =~ /^--port\b(?:=(\d+))?/ || $ARGV[$i] =~ /^-\w*p(\d+)?$/) { if (defined $1) { $explicit_port = $1; } elsif ($i < $#ARGV) { $explicit_port = $ARGV[$i+1]; } } # "service=" in connection string if ($ARGV[$i] =~ /\bservice=/) { $explicit_service = 1; } } # if only a port is specified, look for local cluster on specified port if ($explicit_port and not $version and not $cluster and not $explicit_host and not $explicit_service) { LOOP: foreach my $v (reverse get_versions()) { foreach my $c (get_version_clusters $v) { my $p = get_cluster_port $v, $c; if ($p eq $explicit_port) { $version = $v; # set PGCLUSTER variable for information $ENV{PGCLUSTER} = "$version/$c"; last LOOP; } } } } # if we don't have a cluster, and no specific host or port was given, consult postgresqlrc # or fall back to default port cluster (on 5432), or undef otherwise my ($db); ($version, $cluster, $db) = user_cluster_map() unless ($cluster or $explicit_host or $explicit_port); my ($host, $port); if ($cluster) { # check if we have a network cluster (N.N/the.host.name:port) if ($cluster =~ /^(\S+):(\d*)$/) { $host = $1; $port = $2 || $PgCommon::defaultport; } elsif (not cluster_exists($version, $cluster)) { # a specific cluster was requested, error out because it doesn't exist error "Cluster $version $cluster does not exist"; } else { $host = get_cluster_socketdir ($version, $cluster); $port = get_cluster_port($version, $cluster); } # set PGCLUSTER variable for information $ENV{PGCLUSTER} = "$version/$cluster"; } # setup environment $ENV{'PGSYSCONFDIR'} //= '/etc/postgresql-common'; $ENV{'PGHOST'} = $host if ($host); $ENV{'PGPORT'} = $port if $port && !$ENV{'PGPORT'}; $ENV{'PGDATABASE'} = $db if $db && !$ENV{'PGDATABASE'}; # check under which name we were called my $cmdname = (split '/', $0)[-1]; unless ($version or $explicit_host or $explicit_port or $explicit_service) { print STDERR "Warning: No existing cluster is suitable as a default target. Please see man pg_wrapper(1) how to specify one.\n"; } # if we have no version yet, use the latest version. If we were called as psql, # pg_archivecleanup, or pg_isready, always use latest version if (not $version or $cmdname =~ /^(psql|pg_archivecleanup|pg_isready)$/) { my $max_version; if ($version and $version < 9.2) { # psql 15 only supports PG 9.2+ $max_version = 14; } $version = get_newest_version($cmdname, $max_version); } unless ($version) { error 'You must install at least one postgresql-client-<version> package'; } error "PostgreSQL version $version is not installed" unless -d "$PgCommon::binroot$version"; my $cmd; if ($cmdname eq 'pg_wrapper') { error "pg_wrapper called directly but no program given as argument" if (@ARGV == 0); $cmd = shift; # will be unshifted back below } else { $cmd = get_program_path ($cmdname, $version); } # libreadline is a lot better than libedit, so prefer that on versions that still use it if ($cmdname eq 'psql' and $version < 13 and not $PgCommon::rpm) { my @readlines; # non-multiarch path @readlines = sort(</lib/libreadline.so.?>); unless (@readlines) { # get multiarch dir for our architecture if (open PS, '-|', '/usr/bin/ldd', $cmd) { my $out; read PS, $out, 10000; close PS; if ($out =~ m!/libreadline.so!) { # already linked against libreadline @readlines = (); } else { my ($lib_path) = $out =~ m!(/lib/.*)/libedit.so!; @readlines = sort(<$lib_path/libreadline.so.?>); } } } if (@readlines) { $ENV{'LD_PRELOAD'} = ($ENV{'LD_PRELOAD'} or '') . ':' . $readlines[-1]; } } error "pg_wrapper: $cmdname was not found in $PgCommon::binroot$version/bin" unless $cmd; unshift @ARGV, $cmd; exec @ARGV; __END__ =head1 NAME pg_wrapper - wrapper for PostgreSQL client commands =head1 SYNOPSIS I<client-program> [B<--cluster> I<version>/I<cluster>] [...] (I<client-program>: B<psql>, B<createdb>, B<dropuser>, and all other client programs installed in C</usr/lib/postgresql/>I<version>C</bin>). =head1 DESCRIPTION This program is run only as a link to names which correspond to PostgreSQL programs in C</usr/lib/postgresql/>I<version>C</bin>. It determines the configured cluster and database for the user and calls the appropriate version of the desired program to connect to that cluster and database, supplying any specified options to that command. The target cluster is selected by the following means, in descending order of precedence: =over =item explicit specification with the B<--host> option =item explicit specification with the B<--cluster> option =item if the B<PGHOST> environment variable is set, no further cluster selection is performed. The default PostgreSQL version and port number (from the command line, the environment variable B<PGPORT>, or default 5432) will be used. =item explicit specification with the B<PGCLUSTER> environment variable =item if a port is given (either via B<-p>, B<--port>, or B<PGPORT>), and no host is given, the local cluster matching that port number is used =item matching entry in C<~/.postgresqlrc> (see L<postgresqlrc(5)>), if that file exists =item matching entry in C</etc/postgresql-common/user_clusters> (see L<user_clusters(5)>), if that file exists =item If only one cluster exists on the local system, that one will be selected. =item If several clusters exist on the local system, the one listening on the default port 5432 will be selected. =back If none of these rules match, B<pg_wrapper> does not set any environment variables and the program called will likely error out with a message like "could not connect to server: Connection refused". For B<psql>, B<pg_archivecleanup>, and B<pg_isready>, B<pg_wrapper> will always use the binary from the newest PostgreSQL version installed, as these are downwards compatible. If the cluster version is older than 9.2, the newest considered binary version is 14. Note that B<pg_wrapper> needs to be able to read the server config to get the port number to connect to. If a non-standard port is configured in a place that pg_wrapper cannot read, connecting will fail. This particularly holds if the port was configured via B<ALTER SYSTEM> in C<postgresql.auto.conf> and pg_wrapper is invoked as any user other than B<postgres> and B<root>. =head1 OPTIONS =over =item B<--cluster> I<version>B</>I<cluster> =item B<--cluster> I<version>B</>I<host>B<:>[I<port>] I<cluster> is either the name of a cluster on the local system, or takes the form I<host>:I<port> for a remote cluster. If I<port> is left empty (i. e. you just specify I<host:>), it defaults to 5432. =back =head1 ENVIRONMENT =over =item B<PGCLUSTER> If C<$PGCLUSTER> is set, its value (of the form I<version>/I<cluster>) specifies the desired cluster, similar to the B<--cluster> option. However, if B<--cluster> is specified, it overrides the value of C<$PGCLUSTER>. =item B<PG_CLUSTER_CONF_ROOT> This specifies an alternative base directory for cluster configurations. This is usually C</etc/postgresql/>, but for testing/development purposes you can change this to point to e. g. your home directory, so that you can use the postgresql-common tools without root privileges. =item B<PGSYSCONFDIR> This is the location of PostgreSQL's and postgresql-common's global configuration (e. g. C<pg_service.conf>, L<user_clusters(5)>). The default is C</etc/postgresql-common/>. =back =head1 FILES =over =item C</etc/postgresql-common/user_clusters> stores the default cluster and database for users and groups as set by the administrators. =item C<$HOME/.postgresqlrc> stores defaults set by the user himself. =back =head1 SEE ALSO L<user_clusters(5)>, L<postgresqlrc(5)> =head1 AUTHOR Martin Pitt L<E<lt>mpitt@debian.orgE<gt>>