Bug 374222: Create a setup.cgi that can check perl module requirements

setup.cgi

+#!/usr/bin/perl -wT
+# The contents of this file are subject to the Mozilla Public
+# License Version 1.1 (the "License"); you may not use this file
+# except in compliance with the License. You may obtain a copy of
+# the License at http://www.mozilla.org/MPL/
+#
+# Software distributed under the License is distributed on an "AS
+# IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+# implied. See the License for the specific language governing
+# rights and limitations under the License.
+#
+# The Initial Developer of the Original Code is Everything Solved.
+# Portions created by Everything Solved are Copyright (C) 2006
+# Everything Solved. All Rights Reserved.
+#
+# The Original Code is the Bugzilla Bug Tracking System.
+#
+# Contributor(s): Max Kanat-Alexander <mkanat@bugzilla.org>
+
+use strict;
+use lib ".";
+
+
+# The order of these "use" statements is important--we have to have
+# CGI before we have CGI::Carp. Without CGI::Carp, "use 5.008" will just throw
+# an Internal Server Error if it fails, instead of showing a useful error
+# message. And unless we're certain we're on 5.008, we shouldn't compile any
+# Bugzilla code, particularly Bugzilla::Constants, because "use constant"
+# might not exist.
+#
+# We can't use Bugzilla::CGI yet, because we're not sure our
+# required perl modules are installed yet. However, CGI comes
+# with perl.
+use CGI;
+use CGI::Carp qw(fatalsToBrowser);
+use 5.008;
+use Bugzilla::Constants;
+require 5.008001 if ON_WINDOWS;
+use Bugzilla::Install::Requirements;
+use Bugzilla::Install::Util qw(display_version_and_os);
+
+local $| = 1;
+
+my $cgi = new CGI;
+$cgi->charset('UTF-8');
+print $cgi->header(-type => 'text/plain');
+
+display_version_and_os();
+my $module_results = check_requirements(1);
+Bugzilla::Install::Requirements::print_module_instructions($module_results, 1);
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