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Get switch parsing right.

    1: #!/usr/bin/perl
    2: # The LearningOnline Network with CAPA
    3: #
    4: #  lonManage supports remote management of nodes in a LonCAPA cluster.
    5: #
    6: #  $Id: lonManage,v 1.4 2003/08/12 10:40:44 foxr Exp $
    7: #
    8: # $Id: lonManage,v 1.4 2003/08/12 10:40:44 foxr Exp $
    9: #
   10: # Copyright Michigan State University Board of Trustees
   11: #
   12: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
   13: ## LON-CAPA is free software; you can redistribute it and/or modify
   14: # it under the terms of the GNU General Public License as published by
   15: # the Free Software Foundation; either version 2 of the License, or
   16: # (at your option) any later version.
   17: #
   18: # LON-CAPA is distributed in the hope that it will be useful,
   19: # but WITHOUT ANY WARRANTY; without even the implied warranty of
   20: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   21: # GNU General Public License for more details.
   22: #
   23: # You should have received a copy of the GNU General Public License
   24: # along with LON-CAPA; if not, write to the Free Software
   25: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   26: #
   27: # /home/httpd/html/adm/gpl.txt
   28: #
   29: # http://www.lon-capa.org/
   30: #
   31: #
   32: #   lonManage supports management of remot nodes in a lonCAPA cluster.
   33: #   it is a command line tool.  The following command line syntax (usage)
   34: #   is supported:
   35: #
   36: #    lonManage  -push   <tablename>  newfile  host
   37: #        Push <tablename> to the lonTabs directory.  Note that
   38: #        <tablename> must be one of:
   39: #           hosts  (hosts.tab)
   40: #           domain (domain.tab)
   41: #
   42: #    lonManage  -reinit lonc host
   43: #           Sends a HUP signal to the remote systems's lond.
   44: #
   45: #    lonmanage  -reinit lond host
   46: #          Requests the remote system's lond perform the same action as if
   47: #          it had received a HUP signal.
   48: #
   49: #    In the above syntax, the host above is the hosts.tab name of a host,
   50: #    not the IP address of the host.
   51: #
   52: #  $Log: lonManage,v $
   53: #  Revision 1.4  2003/08/12 10:40:44  foxr
   54: #  Get switch parsing right.
   55: #
   56: #  Revision 1.3  2003/08/12 10:22:35  foxr
   57: #  Put in parameter parsing infrastructure
   58: #
   59: #  Revision 1.2  2003/08/12 09:58:49  foxr
   60: #  Add usage and skeleton documentation.
   61: #
   62: #
   63: use Getopt::Long;
   64: 
   65: sub Usage  {
   66:     print "Usage:";
   67:     print <<USAGE;
   68:     lonManage  --push=<tablename>  newfile  host
   69:         Push <tablename> to the lonTabs directory.  Note that
   70:         <tablename> must be one of:
   71:            hosts  (hosts.tab)
   72:            domain (domain.tab)
   73: 
   74:     lonManage  --reinit=lonc host
   75:            Sends a HUP signal to the remote systems's lond.
   76: 
   77:     lonmanage  --reinit=lond host
   78:           Requests the remote system's lond perform the same action as if
   79:           it had received a HUP signal.
   80: 
   81:     In the above syntax, the host above is the hosts.tab name of a host,
   82:     not the IP address of the host.
   83: USAGE
   84: 
   85: 
   86: }
   87: 
   88: #
   89: #  Use Getopt::Long to parse the parameters of the program.
   90: #
   91: #  Return value is a list consisting of:
   92: #    A 'command' which is one of:
   93: #       push   - table push requested.
   94: #       reinit - reinit requested.
   95: #   Additional parameters as follows:
   96: #       for push: Tablename, hostname
   97: #       for reinit: Appname  hostname
   98: #
   99: #   This function does not validation of the parameters of push and
  100: #   reinit.
  101: #
  102: #   returns a list.  The first element of the list is the operation name
  103: #   (e.g. reinit or push).  The second element is the switch parameter.
  104: #   for push, this is the table name, for reinit, this is the process name.
  105: #   Additional elements of the list are the command argument.  The count of
  106: #   command arguments is validated, but not their semantics.
  107: #
  108: #   returns an empty list if the parse fails.
  109: #
  110: 
  111: sub ParseArgs {
  112:     my $pushing   = '';
  113:     my $reiniting = '';
  114:     if(!GetOptions('push=s'    => \$pushing,
  115: 	           'reinit=s'  => \$reinitting)) {
  116: 	return ();
  117:     }
  118: 
  119:     #  Require exactly   one of --push and --reinit
  120: 
  121:     my $command = '';
  122:     my $commandarg = '';
  123:     if($pushing ne '') {
  124: 	if($command ne '') {
  125: 	    return ();
  126: 	} else {
  127: 	    $command    = 'push';
  128: 	    $commandarg = $pushing;
  129: 	}
  130:     }
  131:     if ($reinitting ne '') {
  132: 	if($command ne '') {
  133: 	    return ();
  134: 	} else {
  135: 	    $command    = 'reinit';
  136: 	    $commandarg = $reinitting; 
  137: 	}
  138:     }
  139: 
  140:     return ($command, $commandarg);
  141: }
  142: 
  143: #
  144: #    If command parsing failed, then print usage:
  145: 
  146: @status = ParseArgs;
  147: $nparam   = @status;
  148: 
  149: if($nparam == 0) {
  150:     Usage;
  151:     exit -1;
  152: }
  153: print "Will do a $status[0] : $status[1]\n";
  154: 
  155: exit 0;
  156: 
  157: =head1 NAME
  158:     lonManage - Command line utility for remote management of lonCAPA
  159:     cluster nodes.
  160: 
  161: =head1 SYNOPSIS
  162: 
  163: Usage:
  164:     B<lonManage  --push=<tablename>  newfile  host>
  165:         Push <tablename> to the lonTabs directory.  Note that
  166:         <tablename> must be one of:
  167:            hosts  (hosts.tab)
  168:            domain (domain.tab)
  169: 
  170:     B<lonManage  --reinit=lonc host>
  171:            Sends a HUP signal to the remote systems's lond.
  172: 
  173:     B<lonmanage  --reinit=lond host>
  174:           Requests the remote system's lond perform the same action as if
  175:           it had received a HUP signal.
  176: 
  177:     In the above syntax, the host above is the hosts.tab name of a host,
  178:     not the IP address of the host.
  179: 
  180: 
  181: =head1 DESCRIPTION
  182: 
  183: =head1 PREREQUISITES
  184: 
  185: =item Getopt::Long
  186: 
  187: =head1  CATEGORIES
  188:     Command line utility
  189: 
  190: =cut