Fixup: Now db_host parameter became optional.

On mysql & PostgreSQL, undefined db_host is treated as "localhost".

src/lib/Conf.pm

@@ -1319,7 +1319,7 @@ sub load_sql_filter {
                 'db_type' =>
                     {'format' => 'mysql|MySQL|Oracle|Pg|PostgreSQL|SQLite',},
                 'db_name'    => {'format' => '.*',  'occurrence' => '1',},
-                'db_host'    => {'format' => '.*',  'occurrence' => '1',},
+                'db_host'    => {'format' => '.*',  'occurrence' => '0-1',},
                 'statement'  => {'format' => '.*',  'occurrence' => '1',},
                 'db_user'    => {'format' => '.*',  'occurrence' => '0-1',},
                 'db_passwd'  => {'format' => '.*',  'occurrence' => '0-1',},

src/lib/Sympa/ConfDef.pm

@@ -118,13 +118,14 @@ our @params = (
         'edit' => '1',
     },
     {   'name'       => 'db_host',
-        'default'    => 'localhost',
+        #'default'    => 'localhost',
         'sample'     => 'localhost',
         'gettext_id' => 'Hostname of the database server',
         'gettext_comment' =>
             'With PostgreSQL, you can also use the path to Unix Socket Directory, e.g. "/var/run/postgresql" for connection with Unix domain socket.',
         'file' => 'sympa.conf',
         'edit' => '1',
+        'optional' => 1,
     },
     {   'name'       => 'db_port',
         'default'    => undef,

src/lib/Sympa/DatabaseDriver.pm

@@ -33,10 +33,10 @@ use warnings;
 use base qw(Sympa::Database);
 
 use constant required_modules    => [];
-use constant required_parameters => [qw(db_host db_name db_user)];
+use constant required_parameters => [qw(db_name db_user)];
 use constant optional_modules    => [];
 use constant optional_parameters =>
-    [qw(db_port db_passwd db_timeout db_options db_env)];
+    [qw(db_host db_port db_passwd db_options db_env)];
 
 sub translate_type {
     return $_[1];
@@ -87,7 +87,11 @@ By default, no packages are required.
 
 I<Overridable>.
 Returns an arrayref including names of required (not optional) parameters.
-By default, returns C<['db_host', 'db_name', 'db_user']>.
+By default, returns C<['db_name', 'db_user']>.
+
+I<Note>:
+On Sympa prior to 6.2.37b.2, it by default returned
+C<['db_host', 'db_name', 'db_user']>.
 
 =item optional_modules ( )
 

src/lib/Sympa/DatabaseDriver/MySQL.pm

@@ -42,7 +42,9 @@ sub build_connect_string {
     my $self = shift;
 
     my $connect_string =
-        'DBI:mysql:' . $self->{'db_name'} . ':' . $self->{'db_host'};
+          'DBI:mysql:'
+        . $self->{'db_name'} . ':'
+        . ($self->{'db_host'} || 'localhost');
     $connect_string .= ';port=' . $self->{'db_port'}
         if defined $self->{'db_port'};
     $connect_string .= ';' . $self->{'db_options'}

src/lib/Sympa/DatabaseDriver/Oracle.pm

@@ -37,10 +37,7 @@ use base qw(Sympa::DatabaseDriver);
 
 my $log = Sympa::Log->instance;
 
-use constant required_modules    => [qw(DBD::Oracle)];
-use constant required_parameters => [qw(db_name db_user)];
-use constant optional_parameters =>
-    [qw(db_host db_port db_passwd db_options db_env)];
+use constant required_modules => [qw(DBD::Oracle)];
 
 sub build_connect_string {
     my $self = shift;

src/lib/Sympa/DatabaseDriver/PostgreSQL.pm

@@ -43,7 +43,10 @@ sub build_connect_string {
     my $self = shift;
 
     my $connect_string =
-        "DBI:Pg:dbname=$self->{'db_name'};host=$self->{'db_host'}";
+          'DBI:Pg:dbname='
+        . $self->{'db_name'}
+        . ';host='
+        . ($self->{'db_host'} || 'localhost');
     $connect_string .= ';port=' . $self->{'db_port'}
         if defined $self->{'db_port'};
     $connect_string .= ';' . $self->{'db_options'}

src/lib/Sympa/ListDef.pm

@@ -1998,7 +1998,8 @@ our %pinfo = (
                 'order'      => 2,
                 'gettext_id' => "remote host",
                 format_s     => '$host',
-                'occurrence' => '1'
+                # Not required for ODBC and SQLite. Optional for Oracle.
+                #'occurrence' => '1'
             },
             'db_port' => {
                 'order'      => 3,

src/lib/Sympa/Scenario.pm

@@ -1545,12 +1545,8 @@ sub search {
             %{$sql_conf->{'sql_named_filter_query'}}
         );
         unless ($db and $db->connect()) {
-            $log->syslog(
-                'notice',
-                'Unable to connect to the SQL server %s:%d',
-                $sql_conf->{'db_host'},
-                $sql_conf->{'db_port'}
-            );
+            $log->syslog('notice',
+                'Unable to connect to the SQL server %s', $db);
             return undef;
         }