--- doc/loncapafiles/updatequery.piml	2002/05/03 02:06:45	1.1
+++ doc/loncapafiles/updatequery.piml	2003/02/03 18:03:51	1.24
@@ -1,7 +1,6 @@
-<!-- sanitycheck.piml -->
-<!-- Scott Harrison -->
+<!-- updatequery.piml -->
 
-<!-- $Id: updatequery.piml,v 1.1 2002/05/03 02:06:45 harris41 Exp $ -->
+<!-- $Id: updatequery.piml,v 1.24 2003/02/03 18:03:51 harris41 Exp $ -->
 
 <!--
 
@@ -31,8 +30,9 @@ http://www.lon-capa.org/
 <targetroot>/</targetroot>
 <files>
 <file>
-<target dist='default'>/home/httpd/lonUsers2</target>
+<target dist='default'>/</target>
 <perlscript mode='fg'>
+$|=1;
   print(&lt;&lt;END);
 
 
@@ -47,25 +47,227 @@ http://www.lon-capa.org/
 *********************************************
 
 END
+sleep(3);
 </perlscript>
 </file>
 <file>
-<target dist='default'>/home/httpd/lonUsers2</target>
+<target dist='default'>loncom/hosts.tab</target>
 <perlscript mode='fg'>
+unless (-l "<TARGET />") {
+  print(&lt;&lt;END);
+
+===============================================================================
+What hosts.tab would you like to have installed?
+(hosts.tab is a listing of all other internet machines
+that a server system considers to be valid server systems
+on the LON-CAPA network)
+
+1) PRODUCTION - you want to deliver courses today or sometime very soon
+                on this machine
+2) STAND-ALONE - you want this machine to run in 'stand-alone' mode and
+                 not be connected to other LON-CAPA machines for now
+3) DEVELOPMENT - you want to play with or explore LON-CAPA
+4) PRESERVE the existing hosts.tab (/home/httpd/lonTabs/hosts.tab)
+
+END
+# Option number 26 will install rawhide_hosts.tab, but
+# the typical user does not want to be part of an intensive
+# machine test cluster.
+
+# get input
+# if valid then process, otherwise loop
+$flag=0;
+while (!$flag) {
+  print "ENTER 1, 2, 3, or 4:\n";
+  my $choice=&lt;&gt;;
+  chomp($choice);
+  if ($choice==1) {
+    $lonCluster='production'; $flag=1;
+  }
+  elsif ($choice==2) {
+    $lonCluster='standalone'; $flag=1;
+  }
+  elsif ($choice==3) {
+    $lonCluster='development'; $flag=1;
+  }
+  elsif ($choice==4) {
+    $lonCluster='existing'; $flag=1;
+    if (-e '/home/httpd/lonTabs/hosts.tab') {
+      `cp /home/httpd/lonTabs/hosts.tab ../existing_hosts.tab`;
+    }
+    else {
+      print &lt;&lt;END;
+There is no existing /home/httpd/lonTabs/hosts.tab
+END
+      die('');
+    }
+  }
+  elsif ($choice==26) {
+    $lonCluster='rawhide'; $flag=1;
+  }
+}
+}
+</perlscript>
+</file>
+<file>
+<target dist='default'>/home/httpd/lonTabs/hosts.tab</target>
+<perlscript mode='fg'>
+$|=1;
+my $domainDescription;
 unless (-e "<TARGET />") {
   print(&lt;&lt;END);
            WELCOME TO LON-CAPA!
 
 If you have questions, please visit http://install.lon-capa.org
-or contact sharrison@install.lon-capa.org.
+or contact sharrison\@mail.lon-capa.org.
 
 ===============================================================================
-The following 3 values are needed to configure LON-CAPA:
-* Machine ID Name
-* LON-CAPA Domain Name, and
+The following 4 values are needed to configure LON-CAPA:
+* Machine Role
+* LON-CAPA Domain Name
+* LON-CAPA Machine ID Name, and
 * System Administration E-mail Address.
 END
 
+open(OUT,'&gt;/tmp/loncapa_updatequery.out');
+close(OUT);
+
+# query for Machine Role
+  print(&lt;&lt;END);
+**** Machine Role ****
+Library server (recommended if first-time installation of LON-CAPA):
+   Servers that are repositories of authoritative educational resources.
+   These servers also provide the construction space by which instructors
+   assemble their classroom online material.
+Access server:
+   Servers that load-balance high-traffic delivery of educational resources
+   over the world-wide web.
+1) Will this be a library server? (recommended if this is your first install)
+2) Or, will this be an access server?
+END
+my $flag=0;
+my $r='';
+my $lonRole;
+while (!$flag) {
+  print "ENTER A CHOICE OF 1 or 2:\n";
+  my $choice=&lt;&gt;;
+  chomp($choice);
+  if ($choice==1) {
+    open(OUT,'&gt;&gt;/tmp/loncapa_updatequery.out');
+    print(OUT 'lonRole'."\t".'library'."\n");
+    close(OUT);
+    $lonRole='library';
+    $r='l';
+    $flag=1;
+  }
+  elsif ($choice==2) {
+    open(OUT,'&gt;&gt;/tmp/loncapa_updatequery.out');
+    print(OUT 'lonRole'."\t".'access'."\n");
+    close(OUT);
+    $lonRole='access';
+    $r='a';
+    $flag=2;
+  }
+  else {
+
+  }
+}
+
+# need to recommend a machine ID name (ipdomain.l.somenumber)
+my $hostname=`hostname`; chomp($hostname);
+my $ipdomain='';
+if ($hostname=~/([^\.]*)\.([^\.]*)$/) {
+  $ipdomain=$1;
+}
+
+  print(&lt;&lt;END);
+
+**** Domain ****
+[this does NOT need to correspond to internet address domains,
+ examples might be "msu" or "bionet" or "vermontcc"]
+END
+
+# get domain name
+# accept if valid, if not valid, tell user and repeat
+$flag=0;
+my $lonDefDomain;
+while (!$flag) {
+if ($ipdomain) {
+print(&lt;&lt;END);
+ENTER LONCAPA DOMAIN [$ipdomain]:
+END
+}
+else {
+  print(&lt;&lt;END);
+ENTER LONCAPA DOMAIN:
+END
+}
+  my $choice=&lt;&gt;;
+  chomp($choice);
+  my $bad_domain_flag=0;
+  my @bad_domain_names=('raw','userfiles','priv','adm','uploaded');
+  foreach my $bad (@bad_domain_names) {
+    $bad_domain_flag=1 if $choice eq $bad;
+  }
+  if ($ipdomain and $choice=~/^\s*$/) {
+    $choice=$ipdomain;
+    open(OUT,'&gt;&gt;/tmp/loncapa_updatequery.out');
+    print(OUT 'lonDefDomain'."\t".$choice."\n");
+    close(OUT);
+    $lonDefDomain=$choice;
+    $flag=1;
+  }
+  elsif ($choice!~/\_/ and $choice=~/^\w+$/) {
+    open(OUT,'&gt;&gt;/tmp/loncapa_updatequery.out');
+    print(OUT 'lonDefDomain'."\t".$choice."\n");
+    close(OUT);
+    $lonDefDomain=$choice;
+    $r='l';
+    $flag=1;
+  }
+  elsif ($bad_domain_flag) {
+    print "Invalid input ('$choice' conflicts with LON-CAPA namespace).\n";
+    print "Please try something different than '$choice'\n";
+  }
+  else {
+    print "Invalid input (only alphanumeric characters supported).\n";
+  }
+}
+
+
+# get domain description
+# accept if valid, if not valid, tell user and repeat
+$flag=0;
+
+while (!$flag) {
+  print(&lt;&lt;END);
+
+**** Domain Description ****
+String describing the domain, to be shown to users.
+[Example, msu is Michigan State University]
+ENTER DOMAIN DESCRIPTION:
+END
+
+  my $choice=&lt;&gt;;
+  chomp($choice);
+  if ($choice!~/:/) {
+    open(OUT,'&gt;&gt;/tmp/loncapa_updatequery.out');
+    print(OUT 'domainDescription'."\t".$choice."\n");
+    close(OUT);
+    $domainDescription=$choice;
+    $flag=1;
+  }
+  else {
+    print "Invalid input (no ':' allowed).\n";
+  }
+}
+
+my $lonHostID;
+if ($lonDefDomain) {
+  $lonHostID=$lonDefDomain.$r.int(1+rand(9)); # should be probably also detect
+                                              # against the hosts.tab
+}
+
   print(&lt;&lt;END);
 
 **** Machine ID Name ****
@@ -74,85 +276,397 @@ END
  we recommend that you use a name based off of your institution;
  good examples: "msul1" or "bionetl1";
  bad examples: "loncapabox" or "studentsinside"]
-ENTER MACHINE ID NAME:
 END
 # get machine name
 # accept if valid, if not valid, tell user and repeat
-
+$flag=0;
+while (!$flag) {
+if ($ipdomain) {
+print(&lt;&lt;END);
+ENTER LONCAPA MACHINE ID [$lonHostID]:
+END
+}
+else {
   print(&lt;&lt;END);
-
-**** Domain ****
-[this does NOT need to correspond to internet address domains,
- examples might be "msu" or "bionet" or "vermontcc"]
-ENTER LONCAPA DOMAIN:
+ENTER LONCAPA MACHINE ID:
 END
+}
+  my $choice=&lt;&gt;;
+  chomp($choice);
+  if ($lonHostID and $choice=~/^\s*$/) {
+    $choice=$lonHostID;
+    open(OUT,'&gt;&gt;/tmp/loncapa_updatequery.out');
+    print(OUT 'lonHostID'."\t".$choice."\n");
+    close(OUT);
+    $lonHostID=$choice;
+    $flag=1;
+  }
+  elsif ($choice!~/\_/ and $choice=~/^\w+$/) {
+    open(OUT,'&gt;&gt;/tmp/loncapa_updatequery.out');
+    print(OUT 'lonHostID'."\t".$choice."\n");
+    close(OUT);
+    $lonHostID=$choice;
+    $flag=1;
+  }
+  else {
+    print "Invalid input (only alphanumeric characters supported).\n";
+  }
+}
 
-# get domain name
+# get e-mail address
 # accept if valid, if not valid, tell user and repeat
-
+$flag=0;
+my $lonAdmEMail;
+while (!$flag) {
   print(&lt;&lt;END);
 
 **** System Administrator's E-mail ****
 E-mail address of the person who will manage this machine
-[should be in the form somebody@somewhere]
+[should be in the form somebody\@somewhere]
 ENTER E-MAIL ADDRESS:
 END
 
-# get e-mail address
-# accept if valid, if not valid, tell user and repeat
+  my $choice=&lt;&gt;;
+  chomp($choice);
+  if ($choice=~/\@/) {
+    open(OUT,'&gt;&gt;/tmp/loncapa_updatequery.out');
+    print(OUT 'lonAdmEMail'."\t".$choice."\n");
+    close(OUT);
+    $lonAdmEMail=$choice;
+    $flag=1;
+  }
+  else {
+    print "Invalid input (this needs to look like an e-mail address!).\n";
+  }
+}
+
 # update loncapa.conf
+my $confdir='/etc/httpd/conf/';
+#my $confdir='';
+my $filename='loncapa.conf';
+my %perlvar;
+    if (-e "$confdir$filename") {
+	open(CONFIG,'&lt;'.$confdir.$filename) or die("Can't read $confdir$filename");
+	while (my $configline=&lt;CONFIG&gt;) {
+	    if ($configline =~ /^[^\#]*PerlSetVar/) {
+		my ($unused,$varname,$varvalue)=split(/\s+/,$configline);
+		chomp($varvalue);
+		$perlvar{$varname}=$varvalue if $varvalue!~/^\{\[\[\[\[/;
+	    }
+	}
+	close(CONFIG);
+    }
+    $perlvar{'lonHostID'}=$lonHostID;
+    $perlvar{'lonDefDomain'}=$lonDefDomain;
+    $perlvar{'lonAdmEMail'}=$lonAdmEMail;
+    $perlvar{'lonRole'}=$lonRole;
+    unless ($perlvar{'lonLoadLim'} and $perlvar{'lonLoadLim'}!~/\{\[\[\[\[/) {
+       $perlvar{'lonLoadLim'}='2.00';
+    }
+    unless ($perlvar{'lonExpire'} and $perlvar{'lonExpire'}!~/\{\[\[\[\[/) {
+       $perlvar{'lonExpire'}='86400';
+    }
+    unless ($perlvar{'lonReceipt'} and $perlvar{'lonReceipt'}!~/\{\[\[\[\[/) {
+       my $lonReceipt='';
+       srand(time ^ $$ ^ unpack "%L*", `ps axww | gzip`);
+       my @alnum=(0..9,a..z);
+       foreach my $i (1..20) {
+	 $lonReceipt.=$alnum[int(rand(36))];
+       }
+       $perlvar{'lonReceipt'}=$lonReceipt;
+    }
+    open(OUT,"&gt;$confdir$filename") or
+      die("Cannot output to $confdir$filename\n");
+    foreach my $key (keys %perlvar) {
+      my $value=$perlvar{$key};
+      print(OUT &lt;&lt;END);
+PerlSetVar     $key      $value
+END
+    }
+    close(OUT);
 }
 </perlscript>
 </file>
 <file>
-<target dist='default'>/home/httpd/lonUsers2</target>
+<target dist='default'>/</target>
 <perlscript mode='fg'>
 # read values from loncapa.conf
+my $confdir='/etc/httpd/conf/';
+my $filename='loncapa.conf';
+my %perlvar;
+    if (-e "$confdir$filename") {
+	open(CONFIG,'&lt;'.$confdir.$filename) or 
+          die("Can't read $confdir$filename");
+	while (my $configline=&lt;CONFIG&gt;) {
+	    if ($configline =~ /^[^\#]*PerlSetVar/) {
+		my ($unused,$varname,$varvalue)=split(/\s+/,$configline);
+		chomp($varvalue);
+		$perlvar{$varname}=$varvalue;
+	    }
+	}
+	close(CONFIG);
+    }
+    unless ($perlvar{'lonLoadLim'} and $perlvar{'lonLoadLim'}!~/\{\[\[\[\[/) {
+       $perlvar{'lonLoadLim'}='2.00';
+    }
+    unless ($perlvar{'lonExpire'} and $perlvar{'lonExpire'}!~/\{\[\[\[\[/) {
+       $perlvar{'lonExpire'}='86400';
+    }
+    unless ($perlvar{'lonReceipt'} and $perlvar{'lonReceipt'}!~/\{\[\[\[\[/) {
+       my $lonReceipt='';
+       srand(time ^ $$ ^ unpack "%L*", `ps axww | gzip`);
+       my @alnum=(0..9,a..z);
+       foreach my $i (1..20) {
+	 $lonReceipt.=$alnum[int(rand(36))];
+       }
+       $perlvar{'lonReceipt'}=$lonReceipt;
+    }
+my %perlvarstatic;
+    if (-e "${confdir}loncapa_apache.conf") {
+	open(CONFIG,'&lt;'.$confdir.'loncapa_apache.conf') or 
+          die("Can't read ${confdir}loncapa_apache.conf");
+	while (my $configline=&lt;CONFIG&gt;) {
+	    if ($configline =~ /^[^\#]*PerlSetVar/) {
+		my ($unused,$varname,$varvalue)=split(/\s+/,$configline);
+		chomp($varvalue);
+		$perlvarstatic{$varname}=$varvalue;
+	    }
+	}
+	close(CONFIG);
+    }
+    if (!$domainDescription && $lonCluster ne 'existing') {
+       open(IN,'&lt;../'.$lonCluster.'_hosts.tab');
+       while(&lt;IN&gt;) {
+          if (/^$perlvar{'lonHostID'}\:/) {
+	     (undef,undef,undef,undef,undef,$domainDescription)=split(/:/,$_);
+	     chomp($domainDescription);
+             last;
+          }
+       }
+       close(IN);
+    }
+    if (!$domainDescription) {
+       open(IN,'&lt;/home/httpd/lonTabs/hosts.tab');
+       while(&lt;IN&gt;) {
+          if (/^$perlvar{'lonHostID'}\:/) {
+	     (undef,undef,undef,undef,undef,$domainDescription)=split(/:/,$_);
+	     chomp($domainDescription);
+             last;
+          }
+       }
+       close(IN);
+    }
+   
+# implement editing logic below, interactively
+# update loncapa.conf until 8 is entered
+
+$flag=0;
+
+while (!$flag) {
   print(&lt;&lt;END);
 
 ===============================================================================
 This is now the current configuration of your machine.
-1) Machine Name: $perlsetvar{'lonHostID'}
-2) Domain Name: $perlsetvar{'lonDefDomain'}
-3) System Administrator's E-mail Address: $perlsetvar{'lonAdmEmail'}
-4) Role: $perlsetvar{'lonRole'}
-5) Cache Expiration Time: $perlsetvar{'lonExpire'}
-6) Server Load: $perlsetvar{'lonLoadLim'}
-7) Everything is correct up above
-ENTER A CHOICE OF 1-6 TO CHANGE, otherwise ENTER 7:
+1) Domain Name: $perlvar{'lonDefDomain'}
+2) Domain Description: $domainDescription
+3) Machine Name: $perlvar{'lonHostID'}
+4) System Administrator's E-mail Address: $perlvar{'lonAdmEMail'}
+5) Role: $perlvar{'lonRole'}
+6) Cache Expiration Time: $perlvar{'lonExpire'}
+7) Server Load: $perlvar{'lonLoadLim'}
+8) Everything is correct up above
 END
+my $hbug=-1;
+my $dbug=-1;
+{
+  my $v=$perlvar{'lonHostID'};
+  $hbug=0;
+  $hbug=1 if $v=~/\W/;
+  $hbug=1 if $v=~/\_/;
+}
+{
+  my $v=$1;
+  $dbug=0;
+  $dbug=1 if $v=~/\W/;
+  $dbug=1 if $v=~/\_/;
+}
 
-# implement editing logic below, interactively
-# update loncapa.conf until 7 is entered
+if ($hbug) {
+  print "**** ERROR **** ".
+	"Invalid lonHostID (should only be letters and/or digits)\n";
+}
+if ($dbug) {
+  print "**** ERROR **** ".
+	"Invalid lonDefDomain (should only be letters and/or digits)\n";
+}
+
+  print(&lt;&lt;END);
+ENTER A CHOICE OF 1-7 TO CHANGE, otherwise ENTER 8:
+END
+my $choice=&lt;&gt;;
+chomp($choice);
+  if ($choice==1) {
+  print(&lt;&lt;END);
+1) Domain Name: $perlvar{'lonDefDomain'}
+ENTER NEW VALUE (this is an internal value used to identify a group of
+                 LON-CAPA machines, it must be alphanumerical, we suggest
+                 using a part of your actual DNS domain. For example, for
+                 the machine loncapa.msu.edu, we set the Domain to msu):
+END
+    my $choice2=&lt;&gt;;
+    chomp($choice2);
+    $perlvar{'lonDefDomain'}=$choice2;
+  }
+  elsif ($choice==2) {
+  print(&lt;&lt;END);
+2) Domain Description: $domainDescription
+ENTER NEW VALUE (this should be a string that describes your domain, spaces
+                 and punctuation are fine except for ':'):
+END
+    my $choice2=&lt;&gt;;
+    chomp($choice2);
+    $domainDescription=$choice2;
+  }
+  elsif ($choice==3) {
+  print(&lt;&lt;END);
+3) Machine Name: $perlvar{'lonHostID'}
+ENTER NEW VALUE (this will be the name of the machine in the LON-CAPA network
+                 it cannot contain any of '_' '-' '.' or ':'. We suggest that
+                 if you are in the domain 'example' and are the first library
+                 server you enter 'examplel1') :
+END
+    my $choice2=&lt;&gt;;
+    chomp($choice2);
+    $perlvar{'lonHostID'}=$choice2;
+  }
+  elsif ($choice==4) {
+  print(&lt;&lt;END);
+4) System Administrator's E-mail Address: $perlvar{'lonAdmEMail'}
+ENTER NEW VALUE:
+END
+    my $choice2=&lt;&gt;;
+    chomp($choice2);
+    $perlvar{'lonAdmEMail'}=$choice2;
+  }
+  elsif ($choice==5) {
+  print(&lt;&lt;END);
+5) Role: $perlvar{'lonRole'}
+ENTER NEW VALUE (this should be either 'access' or 'library' 
+                 if in doubt select 'library'):
+END
+    my $choice2=&lt;&gt;;
+    chomp($choice2);
+    $perlvar{'lonRole'}=$choice2;
+  }
+  elsif ($choice==6) {
+  print(&lt;&lt;END);
+6) Cache Expiration Time: $perlvar{'lonExpire'}
+ENTER NEW VALUE (in seconds, 86400 is a reasonable value):
+END
+    my $choice2=&lt;&gt;;
+    chomp($choice2);
+    $perlvar{'lonExpire'}=$choice2;
+  }
+  elsif ($choice==7) {
+  print(&lt;&lt;END);
+7) Server Load: $perlvar{'lonLoadLim'}
+ENTER NEW VALUE:
+END
+    my $choice2=&lt;&gt;;
+    chomp($choice2);
+    $perlvar{'lonLoadLim'}=$choice2;
+  }
+  elsif ($choice==8) {
+    $flag=1;
+  }
+  else {
 
+  }
+}
+    open(OUT,"&gt;$confdir$filename") or
+      die("Cannot output to $confdir$filename\n");
+    foreach my $key (keys %perlvar) {
+      my $value=$perlvar{$key};
+      print(OUT &lt;&lt;END) unless $perlvarstatic{$key};
+PerlSetVar     $key      $value
+END
+    }
+    close(OUT);
 </perlscript>
 </file>
 <file>
 <target dist='default'>loncom/hosts.tab</target>
 <perlscript mode='fg'>
 unless (-l "<TARGET />") {
-  print(&lt;&lt;END);
-
-===============================================================================
-What hosts.tab would you like to have installed?
-(hosts.tab is a listing of all other internet machines
-that a server system considers to be valid server systems
-on the LON-CAPA network)
-
-1) PRODUCTION - you want to deliver courses today or sometime very soon
-                on this machine
-2) DEVELOPMENT - you want to play with or explore LON-CAPA
-3) Do not install hosts.tab right now
-
-ENTER 1, 2, or 3:
+  my $hostname=`hostname`;chomp($hostname);
+  my $hostaddress=`hostname -i $hostname`;chomp($hostaddress);
+  $hostaddress=~s/\s//;
+  $date=`date -I`; chomp($date);
+  $lonHostID=$perlvar{'lonHostID'};
+  $lonHostID=~s/\W//g;
+  $lineexistflag=0;
+  $hostidexistflag=0;
+  $line2insert=&lt;&lt;END;
+$perlvar{'lonHostID'}:$perlvar{'lonDefDomain'}:$perlvar{'lonRole'}:$hostname:$hostaddress:$domainDescription
 END
-# Option number 26 will install rawhide_hosts.tab, but
-# the typical user does not want to be part of an intensive
-# machine test cluster.
-
-# get input
-# if valid then process, otherwise loop
-
+  if ($lonCluster eq 'standalone') {
+    open(OUT,'&gt;../'.$lonCluster.'_hosts.tab') or
+      die('file generation error');
+      print(OUT $line2insert);
+    close(OUT);
+  }
+  if ($flag==1) {
+    `rm -f ../hosts.tab`;
+    open(IN,'&lt;../'.$lonCluster.'_hosts.tab');
+    while(&lt;IN&gt;) {
+      if (/^$line2insert$/) {
+        $lineexistflag=1;
+      }
+      if (/^$lonHostID\:/) {
+        $hostidexistflag=1;
+      }
+    }
+    close(IN);
+    if ($hostidexistflag and !$lineexistflag) {
+      print &lt;&lt;END;
+WARNING: $lonHostID already exists inside
+loncapa/loncom/${lonCluster}_hosts.tab.  The entry inside
+${lonCluster}_hosts.tab does not match your settings.
+The entry inside ${lonCluster}_hosts.tab is being replaced
+with your new values.
+END
+      `grep -v "$lonHostID:" ../${lonCluster}_hosts.tab &gt; ../new_${lonCluster}_hosts.tab`;
+       open(OUT,'&gt;&gt;../new_'.$lonCluster.'_hosts.tab') or
+         die("cannot open loncom/${lonCluster}_hosts.tab for output\n");
+         print(OUT $line2insert);
+       close(OUT);
+      `ln -s new_${lonCluster}_hosts.tab ../hosts.tab`;
+      # email appropriate message
+      system('ping -c 1 www.lon-capa.org > /dev/null || ping -c 1 www.msu.edu > /dev/null || ping -c 1 www.mit.edu > /dev/null');
+      `echo "REPLACE:$lonCluster:$lonHostID:$date:$line2insert" | mail -s "REPLACE:$lonCluster:$lonHostID:$date" installrecord\@mail.lon-capa.org` unless $?;
+    }
+    elsif ($hostidexistflag and $lineexistflag) {
+      print &lt;&lt;END;
+Entry exists in ${lonCluster}_hosts.tab.
+END
+      `ln -s ${lonCluster}_hosts.tab ../hosts.tab`;
+      # email appropriate message
+      `echo "STABLEUPDATE:$lonCluster:$lonHostID:$date:$line2insert" | mail -s "STABLEUPDATE:$lonCluster:$lonHostID:$date" installrecord\@mail.lon-capa.org`;
+    }
+    elsif (!$hostidexistflag and !$lineexistflag) {
+      print &lt;&lt;END;
+New entry for $lonCluster.
+END
+      `cat ../${lonCluster}_hosts.tab &gt; ../new_${lonCluster}_hosts.tab`;
+       open(OUT,'&gt;&gt;../new_'.$lonCluster.'_hosts.tab') or
+         die("cannot open loncom/new_${lonCluster}_hosts.tab for output\n");
+         print(OUT $line2insert);
+       close(OUT);
+      `ln -s new_${lonCluster}_hosts.tab ../hosts.tab`;
+      # email appropriate message
+      `echo "INSERT:$lonCluster:$lonHostID:$date:$line2insert" | mail -s "INSERT:$lonCluster:$lonHostID:$date" installrecord\@mail.lon-capa.org`;
+    }
+  }
 }
 </perlscript>
 </file>