Auftrags-Controller: Bemerkungen und interne Bemerkungen

[mfinanz.git] / scripts / dbupgrade2_tool.pl

diff --git a/scripts/dbupgrade2_tool.pl b/scripts/dbupgrade2_tool.pl
index 0d2d23aefd1b7dc32ef465a30399d0a930fd6903..7b614a8ec436ae0588ee62d494c1c518d9796fcf 100755 (executable)
--- a/scripts/dbupgrade2_tool.pl
+++ b/scripts/dbupgrade2_tool.pl
@@ -2,7 +2,7 @@
 
 BEGIN {
   if (! -d "bin" || ! -d "SL") {
 
 BEGIN {
   if (! -d "bin" || ! -d "SL") {

-    print("This tool must be run from the Lx-Office ERP base directory.\n");
+    print("This tool must be run from the kivitendo ERP base directory.\n");

     exit(1);
   }
 
     exit(1);
   }
 


@@ -10,15 +10,24 @@ BEGIN {
   push    @INC, "modules/fallback"; # Only use our own versions of modules if there's no system version.
 }
 
   push    @INC, "modules/fallback"; # Only use our own versions of modules if there's no system version.
 }
 

+
+use strict;
+use warnings;
+
+use utf8;

 use English '-no_match_vars';
 
 use English '-no_match_vars';
 

+use Config::Std;

 use DBI;
 use Data::Dumper;
 use Getopt::Long;
 use DBI;
 use Data::Dumper;
 use Getopt::Long;

+use Text::Iconv;

 
 use SL::LXDebug;
 
 use SL::LXDebug;

+use SL::LxOfficeConf;

 
 

-$lxdebug = LXDebug->new();
+SL::LxOfficeConf->read;
+our $lxdebug = LXDebug->new();

 
 use SL::Auth;
 use SL::Form;
 
 use SL::Auth;
 use SL::Form;


@@ -26,26 +35,40 @@ use SL::User;
 use SL::Locale;
 use SL::DBUpgrade2;
 use SL::DBUtils;
 use SL::Locale;
 use SL::DBUpgrade2;
 use SL::DBUtils;

+use SL::Dispatcher;

 
 #######
 #######
 #######
 
 my ($opt_list, $opt_tree, $opt_rtree, $opt_nodeps, $opt_graphviz, $opt_help);
 
 #######
 #######
 #######
 
 my ($opt_list, $opt_tree, $opt_rtree, $opt_nodeps, $opt_graphviz, $opt_help);

-my ($opt_user, $opt_apply);
+my ($opt_user, $opt_client, $opt_apply, $opt_applied, $opt_unapplied, $opt_format, $opt_test_utf8);
+my ($opt_dbhost, $opt_dbport, $opt_dbname, $opt_dbuser, $opt_dbpassword, $opt_create, $opt_type);
+my ($opt_description, $opt_encoding, @opt_depends, $opt_auth_db);
+
+our (%myconfig, $form, $user, $auth, $locale, $controls, $dbupgrader);

 
 

-our (%myconfig, $form, $user, $auth);
+sub connect_auth {
+  return $auth if $auth;
+
+  $auth = SL::Auth->new;
+  if (!$auth->session_tables_present) {
+    $form->error("The session and user management tables are not present in the authentication database. Please use the administration web interface to create them.");
+  }
+
+  return $auth;
+}

 
 sub show_help {
 
 sub show_help {

-  my $help_text = <<'END_HELP'
+  my $help_text = <<"END_HELP"

 dbupgrade2_tool.pl [options]
 
   A validation and information tool for the database upgrade scripts
 dbupgrade2_tool.pl [options]
 
   A validation and information tool for the database upgrade scripts

-  in 'sql/Pg-upgrade2'.
+  in \'sql/Pg-upgrade2\'.

 
   At startup dbupgrade2_tool.pl will always check the consistency
   of all database upgrade scripts (e.g. circular references, invalid
 
   At startup dbupgrade2_tool.pl will always check the consistency
   of all database upgrade scripts (e.g. circular references, invalid

-  formats, missing meta information). You can but don't have to specifiy
+  formats, missing meta information). You can but don\'t have to specifiy

   additional actions.
 
   Actions:
   additional actions.
 
   Actions:


@@ -55,21 +78,57 @@ dbupgrade2_tool.pl [options]
     --graphviz[=file]    Create a Postscript document showing a tree of
                          all database upgrades and their dependencies.
                          If no file name is given then the output is
     --graphviz[=file]    Create a Postscript document showing a tree of
                          all database upgrades and their dependencies.
                          If no file name is given then the output is

-                         written to 'db_dependencies.ps'.
+                         written to \'db_dependencies.png\'.
+    --format=...         Format for the graphviz output. Defaults to
+                         \'png\'. All values that the command \'dot\' accepts
+                         for it\'s option \'-T\' are acceptable.

     --nodeps             List all database upgrades that no other upgrade
                          depends on
     --nodeps             List all database upgrades that no other upgrade
                          depends on

-    --apply=tag          Applies the database upgrades 'tag' and all
-                         upgrades it depends on. If '--apply' is used
-                         then the option '--user' must be used as well.
+    --create=tag         Creates a new upgrade with the supplied tag. This
+                         action accepts several optional other options. See
+                         the option section for those. After creating the
+                         upgrade file your \$EDITOR will be called with it.
+    --apply=tag          Applies the database upgrades \'tag\' and all
+                         upgrades it depends on. If \'--apply\' is used
+                         then the option \'--user\' must be used as well.
+    --applied            List the applied database upgrades for the
+                         database that the user given with \'--user\' uses.
+    --unapplied          List the database upgrades that haven\'t been applied
+                         yet to the database that the user given with
+                         \'--user\' uses.
+    --test-utf8          Tests a PostgreSQL cluster for proper UTF-8 support.
+                         You have to specify the database to test with the
+                         parameters --dbname, --dbhost, --dbport, --dbuser
+                         and --dbpassword.

     --help               Show this help and exit.
 
     --help               Show this help and exit.
 

-  Options:
+  General Options:
+    --client=id-or-name  The name (or database ID) of the client to use for
+                         database connectivity. You must provide both a client
+                         and a user.

     --user=name          The name of the user configuration to use for
     --user=name          The name of the user configuration to use for

-                         database connectivity.
-END_HELP
-    ;
+                         database connectivity. You must provide both a client
+                         and a user.
+    --auth-db            Work on the authentication database instead of a
+                         user database.
+    --dbname=name        Database connection options for the UTF-8
+    --dbhost=host        handling test.
+    --dbport=port
+    --dbuser=user
+    --dbpassword=pw
+
+  Options for --create:
+    --type               \'sql\' or \'pl\'. Defaults to sql.
+    --description        The description field of the generated upgrade.
+    --encoding           Encoding used for the file. Defaults to \'utf8\'.
+                         Note: Your editor will not be told to open the file in
+                         this encoding.
+    --depends            Tags of upgrades which this upgrade depends upon.
+                         Defaults to the latest stable release upgrade.
+                         Multiple values possible.

 
 

-  # Syntax-Highlighting-Fix für Emacs: '
+END_HELP
+;

 
   print $help_text;
 
 
   print $help_text;
 


@@ -88,12 +147,12 @@ sub calc_rev_depends {
 }
 
 sub dump_list {
 }
 
 sub dump_list {

-  my @sorted_controls = sort_dbupdate_controls($controls);
+  my @sorted_controls = $dbupgrader->sort_dbupdate_controls;

 
   print "LIST VIEW\n\n" .
     "number tag depth priority\n";
 
 
   print "LIST VIEW\n\n" .
     "number tag depth priority\n";
 

-  $i = 0;
+  my $i = 0;

   foreach (@sorted_controls) {
     print "$i $_->{tag} $_->{depth} $_->{priority}\n";
     $i++;
   foreach (@sorted_controls) {
     print "$i $_->{tag} $_->{depth} $_->{priority}\n";
     $i++;


@@ -117,7 +176,7 @@ sub dump_tree {
 
   calc_rev_depends();
 
 
   calc_rev_depends();
 

-  my @sorted_controls = sort_dbupdate_controls($controls);
+  my @sorted_controls = $dbupgrader->sort_dbupdate_controls;

 
   foreach my $control (@sorted_controls) {
     dump_node($control->{tag}, "") unless (@{ $control->{rev_depends} });
 
   foreach my $control (@sorted_controls) {
     dump_node($control->{tag}, "") unless (@{ $control->{rev_depends} });


@@ -141,7 +200,7 @@ sub dump_tree_reverse {
 
   calc_rev_depends();
 
 
   calc_rev_depends();
 

-  my @sorted_controls = sort_dbupdate_controls($controls);
+  my @sorted_controls = $dbupgrader->sort_dbupdate_controls;

 
   foreach my $control (@sorted_controls) {
     last if ($control->{depth} > 1);
 
   foreach my $control (@sorted_controls) {
     last if ($control->{depth} > 1);


@@ -152,25 +211,30 @@ sub dump_tree_reverse {
 }
 
 sub dump_graphviz {
 }
 
 sub dump_graphviz {

-  my $file_name = shift || "db_dependencies.ps";
+  my %params    = @_;

 
 

-  print "GRAPHVIZ POSTCRIPT\n\n";
+  my $format    = $params{format}    || "png";
+  my $file_name = $params{file_name} || "db_dependencies.${format}";
+
+  print "GRAPHVIZ OUTPUT -- format: ${format}\n\n";

   print "Output will be written to '${file_name}'\n";
 
   calc_rev_depends();
 
   print "Output will be written to '${file_name}'\n";
 
   calc_rev_depends();
 

-  $dot = "|dot -Tps ";
+  my $dot = "|dot -T${format} ";

   open OUT, "${dot}> \"${file_name}\"" || die;
 
   print OUT
     "digraph db_dependencies {\n" .
   open OUT, "${dot}> \"${file_name}\"" || die;
 
   print OUT
     "digraph db_dependencies {\n" .

+    "graph [size=\"16.53,11.69!\"];\n" .

     "node [shape=box style=filled fillcolor=white];\n";
 
   my %ranks;
   foreach my $c (values %{ $controls }) {
     $ranks{$c->{depth}} ||= [];
 
     "node [shape=box style=filled fillcolor=white];\n";
 
   my %ranks;
   foreach my $c (values %{ $controls }) {
     $ranks{$c->{depth}} ||= [];
 

-    my ($pre, $post) = ('node [fillcolor=lightgray] ', 'node [fillcolor=white] ') if (!scalar @{ $c->{rev_depends} });
+    my ($pre, $post) = @{ $c->{rev_depends} } ? ('')x2 :
+      (map "node [fillcolor=$_] ", qw(lightgray white));

 
     push @{ $ranks{$c->{"depth"}} }, qq|${pre}"$c->{tag}"; ${post}|;
   }
 
     push @{ $ranks{$c->{"depth"}} }, qq|${pre}"$c->{tag}"; ${post}|;
   }


@@ -180,10 +244,10 @@ sub dump_graphviz {
   }
 
   foreach my $c (values %{ $controls }) {
   }
 
   foreach my $c (values %{ $controls }) {

-    print OUT "$c->{tag};\n";
+    print OUT qq|"$c->{tag}";\n|;

 
     foreach my $d (@{ $c->{depends} }) {
 
     foreach my $d (@{ $c->{depends} }) {

-      print OUT "$c->{tag} -> $d;\n";
+      print OUT qq|"$c->{tag}" -> "$d";\n|;

     }
   }
 
     }
   }
 


@@ -199,6 +263,67 @@ sub dump_nodeps {
     "\n\n";
 }
 
     "\n\n";
 }
 

+sub create_upgrade {
+  my (%params) = @_;
+
+  my $filename    = $params{filename};
+  my $dbupgrader  = $params{dbupgrader};
+  my $type        = $params{type}        || 'sql';
+  my $description = $params{description} || '';
+  my $encoding    = $params{encoding}    || 'utf-8';
+  my @depends     = @{ $params{depends} };
+
+  if (!@depends) {
+    my @releases = grep { /^release_/ } keys %$controls;
+    @depends = ((sort @releases)[-1]);
+  }
+
+  my $comment;
+  if ($type eq 'sql') {
+    $comment = '--';
+  } elsif ($type eq 'pl') {
+    $comment = '#';
+  } elsif (!$type) {
+    die 'Error: No --type was given but is required for --create.';
+  } else {
+    die 'Error: Unknown --type. Try "sql" or "pl".';
+  }
+
+  my $full_filename = $dbupgrader->path . '/' . $filename . '.' . $type;
+
+  die "file '$full_filename' already exists, aborting" if -f $full_filename;
+
+
+  open my $fh, ">:encoding($encoding)", $full_filename or die "can't open $full_filename";
+  print $fh "$comment \@tag: $filename\n";
+  print $fh "$comment \@description: $description\n";
+  print $fh "$comment \@depends: @depends\n";
+  print $fh "$comment \@encoding: $encoding\n";
+
+  if ($type eq 'pl') {
+    print $fh "package SL::DBUpgrade2::$filename;\n";
+    print $fh "\n";
+    print $fh "use strict;\n";
+    print $fh "use utf8;\n" if $encoding =~ /utf.?8/i;
+    print $fh "\n";
+    print $fh "use parent qw(SL::DBUpgrade2::Base);\n";
+    print $fh "\n";
+    print $fh "sub run {\n";
+    print $fh "  my (\$self) = \@_;\n";
+    print $fh "\n";
+    print $fh "}\n";
+    print $fh "\n";
+    print $fh "1;\n";
+  }
+
+  close $fh;
+
+  print "File $full_filename created.\n";
+
+  system("\$EDITOR $full_filename");
+  exit 0;
+}
+

 sub apply_upgrade {
   my $name = shift;
 
 sub apply_upgrade {
   my $name = shift;
 


@@ -219,7 +344,8 @@ sub apply_upgrade {
 
   my @upgradescripts = map { $controls->{$_}->{applied} = 0; $controls->{$_} } @order;
 
 
   my @upgradescripts = map { $controls->{$_}->{applied} = 0; $controls->{$_} } @order;
 

-  my $dbh = $form->dbconnect_noauto(\%myconfig);
+  my $dbh            = $opt_auth_db ? connect_auth()->dbconnect : $form->dbconnect_noauto(\%myconfig);
+  $dbh->{AutoCommit} = 0;

 
   $dbh->{PrintWarn}  = 0;
   $dbh->{PrintError} = 0;
 
   $dbh->{PrintWarn}  = 0;
   $dbh->{PrintError} = 0;


@@ -227,9 +353,9 @@ sub apply_upgrade {
   $user->create_schema_info_table($form, $dbh);
 
   my $query = qq|SELECT tag FROM schema_info|;
   $user->create_schema_info_table($form, $dbh);
 
   my $query = qq|SELECT tag FROM schema_info|;

-  $sth = $dbh->prepare($query);
+  my $sth = $dbh->prepare($query);

   $sth->execute() || $form->dberror($query);
   $sth->execute() || $form->dberror($query);

-  while (($tag) = $sth->fetchrow_array()) {
+  while (my ($tag) = $sth->fetchrow_array()) {

     $controls->{$tag}->{applied} = 1 if defined $controls->{$tag};
   }
   $sth->finish();
     $controls->{$tag}->{applied} = 1 if defined $controls->{$tag};
   }
   $sth->finish();


@@ -248,26 +374,100 @@ sub apply_upgrade {
     print "Applying upgrade $control->{file}\n";
 
     if ($file_type eq "sql") {
     print "Applying upgrade $control->{file}\n";
 
     if ($file_type eq "sql") {

-      $user->process_query($form, $dbh, "sql/$form->{dbdriver}-upgrade2/$control->{file}", $control);
+      $dbupgrader->process_query($dbh, "sql/Pg-upgrade2/$control->{file}", $control);

     } else {
     } else {

-      $user->process_perl_script($form, $dbh, "sql/$form->{dbdriver}-upgrade2/$control->{file}", $control);
+      $dbupgrader->process_perl_script($dbh, "sql/Pg-upgrade2/$control->{file}", $control);

     }
   }
 
     }
   }
 

-  $dbh->disconnect();
+  $dbh->disconnect unless $opt_auth_db;
+}
+
+sub dump_sql_result {
+  my ($results, $column_order) = @_;
+
+  my %column_lengths = map { $_, length $_ } keys %{ $results->[0] };
+
+  foreach my $row (@{ $results }) {
+    map { $column_lengths{$_} = length $row->{$_} if (length $row->{$_} > $column_lengths{$_}) } keys %{ $row };
+  }
+
+  my @sorted_names;
+  if ($column_order && scalar @{ $column_order }) {
+    @sorted_names = @{ $column_order };
+  } else {
+    @sorted_names = sort keys %column_lengths;
+  }
+
+  my $format       = join('|', map { '%-' . $column_lengths{$_} . 's' } @sorted_names) . "\n";
+
+  printf $format, @sorted_names;
+  print  join('+', map { '-' x $column_lengths{$_} } @sorted_names) . "\n";
+
+  foreach my $row (@{ $results }) {
+    printf $format, map { $row->{$_} } @sorted_names;
+  }
+  printf "(\%d row\%s)\n", scalar @{ $results }, scalar @{ $results } > 1 ? 's' : '';
+}
+
+sub dump_applied {
+  my @results;
+
+  my $dbh            = $opt_auth_db ? connect_auth()->dbconnect : $form->dbconnect_noauto(\%myconfig);
+  $dbh->{AutoCommit} = 0;
+
+  $dbh->{PrintWarn}  = 0;
+  $dbh->{PrintError} = 0;
+
+  $user->create_schema_info_table($form, $dbh);
+
+  my $query = qq|SELECT tag, login, itime FROM schema_info ORDER BY itime|;
+  my $sth = $dbh->prepare($query);
+  $sth->execute() || $form->dberror($query);
+  while (my $ref = $sth->fetchrow_hashref()) {
+    push @results, $ref;
+  }
+  $sth->finish();
+
+  $dbh->disconnect unless $opt_auth_db;
+
+  if (!scalar @results) {
+    print "No database upgrades have been applied yet.\n";
+  } else {
+    dump_sql_result(\@results, [qw(tag login itime)]);
+  }
+}
+
+sub dump_unapplied {
+  my @results;
+
+  my $dbh = $opt_auth_db ? connect_auth()->dbconnect : $form->dbconnect_noauto(\%myconfig);
+
+  $dbh->{PrintWarn}  = 0;
+  $dbh->{PrintError} = 0;
+
+  my @unapplied = $dbupgrader->unapplied_upgrade_scripts($dbh);
+
+  $dbh->disconnect unless $opt_auth_db;
+
+  if (!scalar @unapplied) {
+    print "All database upgrades have been applied.\n";
+  } else {
+    print map { $_->{tag} . "\n" } @unapplied;
+  }

 }
 
 sub build_upgrade_order {
   my $name  = shift;
   my $order = shift;
 }
 
 sub build_upgrade_order {
   my $name  = shift;
   my $order = shift;

-  my $tag   = shift;
+  my $tags  = shift;

 
   my $control = $controls->{$name};
 
   foreach my $dependency (@{ $control->{depends} }) {
     next if $tags->{$dependency};
     $tags->{$dependency} = 1;
 
   my $control = $controls->{$name};
 
   foreach my $dependency (@{ $control->{depends} }) {
     next if $tags->{$dependency};
     $tags->{$dependency} = 1;

-    build_upgrade_order($dependency, $order, $tag);
+    build_upgrade_order($dependency, $order, $tags);

   }
 
   push @{ $order }, $name;
   }
 
   push @{ $order }, $name;


@@ -278,57 +478,118 @@ sub build_upgrade_order {
 #######
 #######
 
 #######
 #######
 

-eval { require "config/lx-erp.conf"; };
-eval { require "config/lx-erp-local.conf"; } if (-f "config/lx-erp-local.conf");
-
-$form = Form->new();
-$locale = Locale->new("de", "login");
+$locale    = Locale->new;
+$form      = Form->new;
+$::request = SL::Request->new(
+  cgi    => CGI->new({}),
+  layout => SL::Layout::None->new,
+);

 
 #######
 #######
 #######
 
 
 #######
 #######
 #######
 

-GetOptions("list"       => \$opt_list,
-           "tree"       => \$opt_tree,
-           "rtree"      => \$opt_rtree,
-           "nodeps"     => \$opt_nodeps,
-           "graphviz:s" => \$opt_graphviz,
-           "user=s"     => \$opt_user,
-           "apply=s"    => \$opt_apply,
-           "help"       => \$opt_help,
+GetOptions("list"         => \$opt_list,
+           "tree"         => \$opt_tree,
+           "rtree"        => \$opt_rtree,
+           "nodeps"       => \$opt_nodeps,
+           "graphviz:s"   => \$opt_graphviz,
+           "format:s"     => \$opt_format,
+           "user=s"       => \$opt_user,
+           "client=s"     => \$opt_client,
+           "apply=s"      => \$opt_apply,
+           "applied"      => \$opt_applied,
+           "create=s"     => \$opt_create,
+           "type=s"       => \$opt_type,
+           "encoding=s"   => \$opt_encoding,
+           "description=s" => \$opt_description,
+           "depends=s"    => \@opt_depends,
+           "unapplied"    => \$opt_unapplied,
+           "test-utf8"    => \$opt_test_utf8,
+           "dbhost:s"     => \$opt_dbhost,
+           "dbport:s"     => \$opt_dbport,
+           "dbname:s"     => \$opt_dbname,
+           "dbuser:s"     => \$opt_dbuser,
+           "dbpassword:s" => \$opt_dbpassword,
+           "auth-db"      => \$opt_auth_db,
+           "help"         => \$opt_help,

   );
 
 show_help() if ($opt_help);
 
   );
 
 show_help() if ($opt_help);
 

-$controls = parse_dbupdate_controls($form, "Pg");
-
-dump_list()                  if ($opt_list);
-dump_tree()                  if ($opt_tree);
-dump_tree_reverse()          if ($opt_rtree);
-dump_graphviz($opt_graphviz) if (defined $opt_graphviz);
-dump_nodeps()                if ($opt_nodeps);
+$dbupgrader = SL::DBUpgrade2->new(form => $form, auth => $opt_auth_db);
+$controls   = $dbupgrader->parse_dbupdate_controls->{all_controls};
+
+dump_list()                                 if ($opt_list);
+dump_tree()                                 if ($opt_tree);
+dump_tree_reverse()                         if ($opt_rtree);
+dump_graphviz('file_name' => $opt_graphviz,
+              'format'    => $opt_format)   if (defined $opt_graphviz);
+dump_nodeps()                               if ($opt_nodeps);
+create_upgrade(filename   => $opt_create,
+               dbupgrader  => $dbupgrader,
+               type        => $opt_type,
+               description => $opt_description,
+               encoding    => $opt_encoding,
+               depends     => \@opt_depends) if ($opt_create);
+
+if ($opt_client && !connect_auth()->set_client($opt_client)) {
+  $form->error($form->format_string("The client '#1' does not exist.", $opt_client));
+}

 
 if ($opt_user) {
 
 if ($opt_user) {

-  $auth = SL::Auth->new();
-  if (!$auth->session_tables_present()) {
-    $form->error("The session and user management tables are not present in the " .
-                 "authentication database. Please use the administration web interface " .
-                 "and to create them.");
-  }
+  $form->error("Need a client, too.") if !$auth || !$auth->client;

 
 

-  %myconfig = $auth->read_user($opt_user);
+  %myconfig = connect_auth()->read_user(login => $opt_user);

 
   if (!$myconfig{login}) {
     $form->error($form->format_string("The user '#1' does not exist.", $opt_user));
   }
 
   $locale = new Locale($myconfig{countrycode}, "all");
 
   if (!$myconfig{login}) {
     $form->error($form->format_string("The user '#1' does not exist.", $opt_user));
   }
 
   $locale = new Locale($myconfig{countrycode}, "all");

-  $user   = new User($opt_user);
+  $user   = new User(login => $opt_user);

 
   map { $form->{$_} = $myconfig{$_} } keys %myconfig;
 }
 
 if ($opt_apply) {
 
   map { $form->{$_} = $myconfig{$_} } keys %myconfig;
 }
 
 if ($opt_apply) {

-  $form->error("--apply used but no configuration file given with --user.") if (!$user);
+  $form->error("--apply used but no user name given with --user.") if !$user && !$opt_auth_db;

   apply_upgrade($opt_apply);
 }
   apply_upgrade($opt_apply);
 }

+
+if ($opt_applied) {
+  $form->error("--applied used but no user name given with --user.") if !$user && !$opt_auth_db;
+  dump_applied();
+}
+
+if ($opt_unapplied) {
+  $form->error("--unapplied used but no user name given with --user.") if !$user && !$opt_auth_db;
+  dump_unapplied();
+}
+
+
+if ($opt_test_utf8) {
+  $form->error("--test-utf8 used but no database name given with --dbname.") if (!$opt_dbname);
+
+  my $umlaut_upper       = 'Ä';
+
+  my $dbconnect          = "dbi:Pg:dbname=${opt_dbname}";
+  $dbconnect            .= ";host=${opt_dbhost}" if ($opt_dbhost);
+  $dbconnect            .= ";port=${opt_dbport}" if ($opt_dbport);
+
+  my $dbh                = DBI->connect($dbconnect, $opt_dbuser, $opt_dbpassword, { pg_enable_utf8 => 1 });
+
+  $form->error("UTF-8 test: Database connect failed (" . $DBI::errstr . ")") if (!$dbh);
+
+  my ($umlaut_lower) = $dbh->selectrow_array(qq|SELECT lower(?)|, undef, $umlaut_upper);
+
+  $dbh->disconnect();
+
+  if ($umlaut_lower eq 'ä') {
+    print "UTF-8 test was successful.\n";
+  } elsif ($umlaut_lower eq 'Ä') {
+    print "UTF-8 test was NOT successful: Umlauts are not modified (this might be partially ok, but you should probably not use UTF-8 on this cluster).\n";
+  } else {
+    print "UTF-8 test was NOT successful: Umlauts are destroyed. Do not use UTF-8 on this cluster.\n";
+  }
+}