Put stats_temp_directory aka pg_stat_tmp into /var/run/postgresql by

default. (Closes: #739276)

createcluster.conf

 # Default values for pg_createcluster(8)
+# Occurrences of '%v' are replaced by the major version number,
+# and '%c' by the cluster name. Use '%%' for a literal '%'.
 
 # Create a "main" cluster when a new postgresql-x.y server package is installed
 #create_main_cluster = true
@@ -7,9 +9,6 @@
 # See pg_createcluster(8) for more documentation.
 #start_conf = 'auto'
 
-# In the following options, occurrences of '%v' are replaced by the major
-# version number, and '%c' by the cluster name. Use '%%' for a literal '%'.
-
 # Default data directory.
 #data_directory = '/var/lib/postgresql/%v/%c'
 
@@ -20,10 +19,14 @@
 # Options to pass to initdb.
 #initdb_options = ''
 
+# The following options are copied into the new cluster's postgresql.conf:
+
 # Enable SSL by default (using the "snakeoil" certificates installed by the
 # ssl-cert package, unless configured otherwise here)
 ssl = __SSL__
 
-# All other options are copied into the new cluster's postgresql.conf
+# Put stats_temp_directory on tmpfs
+stats_temp_directory = '/var/run/postgresql/%v-%c.pg_stat_tmp'
 
+# Add timestamps to log lines
 log_line_prefix = '%%t '

debian/changelog

+postgresql-common (158) UNRELEASED; urgency=medium
+
+  * Put stats_temp_directory aka pg_stat_tmp into /var/run/postgresql by
+    default. (Closes: #739276)
+
+ -- Christoph Berg <myon@debian.org>  Tue, 03 Jun 2014 21:30:05 +0200
+
 postgresql-common (157) unstable; urgency=medium
 
   * Remove createcluster.conf on purge.

pg_createcluster

@@ -458,6 +458,33 @@ my $ssl_key_access;
 my ($uid, $euid, $gid, $egid) = ($<, $>, $(, $));
 change_ugid $owneruid, $ownergid;
 $ssl_key_access = -r $ssl_key_file;
+
+# check for stats_temp_directory access
+if ($defaultconf{stats_temp_directory}) {
+    my $stats_temp_directory = replace_v_c ($defaultconf{stats_temp_directory}, $version, $cluster);
+    $stats_temp_directory =~ s!/$!!; # strip trailing slash
+    my $stats_temp_parent = $stats_temp_directory;
+    $stats_temp_parent =~ s!/[^/]+$!!;
+    if (-d $stats_temp_directory) {
+        if (! -w $stats_temp_directory) {
+            print "Warning: The selected stats_temp_directory $stats_temp_directory
+is not writable for the cluster owner. Not adding this setting in
+postgresql.conf.\n";
+            delete $defaultconf{stats_temp_directory};
+        }
+    } elsif (! -d $stats_temp_parent) {
+        print "Warning: The parent $stats_temp_parent of the selected
+stats_temp_directory does not exist. Not adding this setting in
+postgresql.conf.\n";
+        delete $defaultconf{stats_temp_directory};
+    } elsif (! -w $stats_temp_parent) {
+        print "Warning: The parent $stats_temp_parent of the selected
+stats_temp_directory is not writable for the cluster owner. Not adding this
+setting in postgresql.conf.\n";
+        delete $defaultconf{stats_temp_directory};
+    }
+}
+
 $> = $euid;
 $< = $uid; 
 $( = $gid;
@@ -538,8 +565,8 @@ if ($socketdir eq '/var/run/postgresql') {
 # handle other createcluster.conf parameters
 foreach my $guc (sort keys %defaultconf) {
     next if $guc =~ /^(create_main_cluster|start_conf|data_directory|xlogdir|initdb_options|ssl)$/;
-    PgCommon::set_conf_value $version, $cluster, 'postgresql.conf',
-	$guc, replace_v_c ($defaultconf{$guc}, $version, $cluster);
+    my $val = replace_v_c ($defaultconf{$guc}, $version, $cluster);
+    PgCommon::set_conf_value $version, $cluster, 'postgresql.conf', $guc, $val;
 }
 
 # process --pgoption parameters
@@ -776,7 +803,9 @@ additional options passed to pg_ctl of that cluster.
 =head1 DEFAULT VALUES
 
 Some default values used by B<pg_createcluster> can be modified in
-C</etc/postgresql-common/createcluster.conf>:
+C</etc/postgresql-common/createcluster.conf>. Occurrences of B<%v> are replaced
+by the major version number, and B<%c> by the cluster name. Use B<%%> for a
+literal B<%>.
 
 =over 4
 
@@ -790,9 +819,6 @@ Default C<start.conf> value to use.
 
 =back
 
-In the following options, occurrences of B<%v> are replaced by the major
-version number, and B<%c> by the cluster name. Use B<%%> for a literal B<%>.
-
 =over 4
 
 =item B<data_directory> (Default: B</var/lib/postgresql/%v/%c>)
@@ -809,13 +835,29 @@ default, i.e. pg_xlog is remains in the data directory.
 
 Other options to pass to B<initdb>.
 
-=item I<other options> (Default: none)
+=item Other options
 
 All other options listed are copied into the new cluster's postgresql.conf, e.g.:
 
     listen_addresses = '*'
     log_line_prefix = '%%t '
 
+Some postgresql.conf options are treated specially:
+
+=over 4
+
+=item B<ssl>
+
+Only added to postgresql.conf if the default snakeoil certificates exist and
+are readable for the cluster owner as detailed above.
+
+=item B<stats_temp_directory>
+
+Only added to postgresql.conf if existing, and writable for the cluster owner,
+or else if the parent directory is writable.
+
+=back
+
 =back
 
 =head1 SEE ALSO