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system dependency testing

#!/usr/bin/perl
#
# The LearningOnline Network with CAPA
#
# Tests the MySQL layer of the metadata database.
#
# YEAR=2001
# 9/25,9/30 Scott Harrison
#

###############################################################################
##                                                                           ##
## ORGANIZATION OF THIS PERL CGI SCRIPT                                      ##
##                                                                           ##
## 1. Status of this code                                                    ##
## 2. Purpose and description of program                                     ##
## 3. Modules used by this script                                            ##
## 4. Print MIME Content-type and other initialization                       ##
## 5. Make sure database can be accessed and that this is a library server   ##
##                                                                           ##
###############################################################################

# --------------------------------------------------------- Status of this code
#
# 1=horrible 2=poor 3=fair 4=good 5=excellent
# Organization 5
# Functionality 4
# Has it been tested? 3
#

# ------------------------------------------ Purpose and description of program
#
# This program tests the connection to the MySQL database.

# ------------------------------------------------- Modules used by this script
use strict;
use DBI;

# ---------------------------- Print MIME Content-type and other initialization
$|=1;
print 'Content-type: text/plain'."\n\n";

# --- Make sure that database can be accessed and that this is a library server
# library server test
my %perlvar;
open (CONFIG,"/etc/httpd/conf/access.conf") || 
    (print "Can't read access.conf\n" && exit);
while (my $configline=<CONFIG>) {
    if ($configline =~ /PerlSetVar/) {
	my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
        chomp($varvalue);
        $perlvar{$varname}=$varvalue;
    }
}
close(CONFIG);
unless ($perlvar{'lonRole'} eq 'library') {
    print "SQL testing can only be run on a library server. Skipping test..\n";
    exit 0;
}
# database test
my $dbh;
{
    unless (
	    $dbh = DBI->connect("DBI:mysql:loncapa","www",
				$perlvar{'lonSqlAccess'},
				{ RaiseError =>0,PrintError=>0})
	    ) { 
	print "Cannot connect to database!\n";
	exit 1;
    }
}
%perlvar=(); # undefine it

# --------------------------------------------------- Close database connection
$dbh->disconnect();