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Diff for /loncom/build/loncaparestoreconfigurations between versions 1.3 and 1.15

version 1.3, 2000/10/26 00:28:43 version 1.15, 2003/01/22 02:00:01
Line 1 Line 1
 #!/usr/bin/perl  #!/usr/bin/perl
   
 # loncaparestoreconfigurations  # loncaparestoreconfigurations - restore data to new LON-CAPA conf files
   #
   # $Id$
   #
   # YEAR=2000
   # Scott Harrison 10/25, 11/02, 12/14
   # YEAR=2001
   # Scott Harrison 05/09, 06/01, 11/27
   # YEAR=2002
   # Scott Harrison 03/03, 05/15, 7/27
   # YEAR=2003
   # Scott Harrison 01/21
   #
   ###
   
 # This tool helps in updating a system.  It takes a list of  # This tool helps in updating a system.  It restores information for
 # .rpmsave files and restores them.  # configuration files (.lpmlnew or other backup notations).
   
 # Scott Harrison, 10/25/2000  # By default, the .lpmlsave suffix is used.
   # Alternatively, there can be two other invocations
   # Invocation #1:
   #   ARGV[0]=suffix
   #   ARGV[1]=.bak
   # Invocation #2:
   #   ARGV[0]=lasttimestamp
   
 use strict;  # The criteria for the lasttimestamp is that the 
   # file suffix is a '.' followed by a 14-digit
   # time-stamp (YYYYMMDDhhmmss).
   # The time-stamp with the greatest value is
   # taken as the backup file.
   
   # --------------------------------------------- Define program version variable
   $VERSION = sprintf("%d.%02d", q$Revision$ =~ /(\d+)\.(\d+)/);
   
   # ---------------------------------------------- Process command-line arguments
   my $suffix='.lpmlsave';
   my $suffixpragma='';
   if ($ARGV[0] eq 'suffix') {
       $suffix=$ARGV[1] if $ARGV[1]=~/^[\.\w]+$/;
   }
   elsif ($ARGV[0] eq 'lasttimestamp') {
       $suffixpragma='lasttimestamp';
   }
   
   use strict; # restrict unsafe and poorly coded constructs
   
   # ------------------------------------ Configuration files to be concerned with
 my @special_conf_files=(  my @special_conf_files=(
  "/etc/httpd/conf/access.conf"   '/etc/httpd/conf/loncapa.conf',
  );   );
   
 my @generic_conf_files=(  my %pvar; # store the PerlSetVar variable key/value combinations
  "/home/httpd/lonTabs/hosts.tab",  
  "/home/httpd/lonTabs/spare.tab",  
  "/etc/krb.conf",  
  "/etc/ntp.conf"  
  );  
   
 foreach (@special_conf_files) {  # --------------------------------------------- Process the configuration files
     if (/^\/etc\/httpd\/conf\/access.conf$/) {  # NOTE that I have structured this processing to make NO assumptions
  my $template=`/bin/cat /etc/httpd/conf/access.conf`;  # about the processing of each configuration file.  So, in terms
  my $rpmsave=`/bin/cat /etc/httpd/conf/access.conf.rpmsave`;  # of keeping each file's processing algorithms self-contained, I am not
  `/bin/mv /etc/httpd/conf/access.conf /etc/httpd/conf/access.conf.template`;  # modularizing things (where it is obvious that they might be modularized.)
  my @perlsetvars=("lonHostID","lonRole","lonAdmEMail","lonDefDomain","lonLoadLim","lonExpire");  CONFLOOP: foreach (@special_conf_files) {
  foreach my $psv (@perlsetvars) {  
     $rpmsave=~/\nPerlSetVar\s+$psv\s+(\S+)/;  
     my $pval=$1;  
     $template=~s/(\nPerlSetVar\s+$psv\s+)\S+/$1$pval/;  
  }  
  open OUT,">/etc/httpd/conf/access.conf";  
  print OUT $template;  
  close OUT;  
     }  
 }  
   
 foreach (@generic_conf_files) {      my $lpmlold; # holds information that needs to be read
     if (-e "$_.rpmsave") {      my $lpmlnew; # holds information that needs to be modified
  `/bin/mv $_ $_.template`;  
  `/bin/mv $_.rpmsave $_`;      my $lpmlnew_file; # file location of information that needs to be modified
     }  
 }  # ---------------------------------------------------------------- loncapa.conf
       if (/^\/etc\/httpd\/conf\/loncapa.conf$/ and
    -e '/etc/httpd/conf/loncapa.conf')
         {
    if ($suffixpragma eq 'lasttimestamp' and
       -e '/etc/httpd/conf/loncapa.conf')
     {
       $suffix=&getsuffix('/etc/httpd/conf/loncapa.conf');
       unless (-e '/etc/httpd/conf/loncapa.conf'.$suffix)
         {
    next CONFLOOP;
         }
       $lpmlold="\n".&readfile('/etc/httpd/conf/loncapa.conf'.$suffix);
       $lpmlnew_file='/etc/httpd/conf/loncapa.conf';
       $lpmlnew=&readfile($lpmlnew_file);
     }
    else
     {
       $lpmlold="\n".&readfile('/etc/httpd/conf/loncapa.conf');
       $lpmlnew_file='/etc/httpd/conf/loncapa.conf'.$suffix;
       unless (-e $lpmlnew_file)
         {
    next CONFLOOP;
         }
       $lpmlnew=&readfile($lpmlnew_file);
     }
    while($lpmlold=~/\n\s*PerlSetVar\s+(\S+)\s+(\S+)/mcg)
     {
       my $pkey=$1; my $pval=$2;
       $pvar{$pkey}=$pval;
     }
    foreach my $pkey (keys %pvar)
     {
       my $pval=$pvar{$pkey};
       $lpmlnew=~s/(\n\s*PerlSetVar\s+$pkey\s+)\S+/$1$pval/;
     }
    open(OUT,'>'.$lpmlnew_file) or
       die('Cannot open '.$lpmlnew_file.' for output'."\n");
    print(OUT $lpmlnew);
    close(OUT);
         }
   
   # ---------------------- smb.conf (probably will be deprecated in 2004 or 2005)
       elsif (/^\/etc\/smb.conf$/ and -e "/etc/smb.conf$suffix")
         {
    if ($suffixpragma eq 'lasttimestamp')
     {
       $suffix=&getsuffix('/etc/smb.conf');
       unless (-e '/etc/httpd/conf/loncapa.conf'.$suffix)
         {
    next CONFLOOP;
         }
       $lpmlnew = &readfile('/etc/smb.conf');
       $lpmlnew_file = '/etc/smb.conf';
     }
    else
     {
       $lpmlnew = &readfile('/etc/smb.conf'.$suffix);
       $lpmlnew_file = '/etc/smb.conf'.$suffix;
     }
    $lpmlnew =~ s/\{\{\{\{\[(.*?)\]\}\}\}\}/$pvar{$1}/ge;
    open(OUT,'>'.$lpmlnew_file) or
       die('Cannot open '.$lpmlnew_file.' for output'."\n");
    print(OUT $lpmlnew);
    close(OUT);
         }
       elsif (/^\/etc\/samba\/smb.conf$/ and -e "/etc/samba/smb.conf$suffix")
         {
    if ($suffixpragma eq 'lasttimestamp')
     {
       $suffix = &getsuffix('/etc/samba/smb.conf');
       unless (-e '/etc/samba/smb.conf'.$suffix)
         {
    next CONFLOOP;
         }
       $lpmlnew = &readfile('/etc/samba/smb.conf');
       $lpmlnew_file = '/etc/samba/smb.conf';
     }
    else
     {
       $lpmlnew = &readfile('/etc/samba/smb.conf'.$suffix);
       $lpmlnew_file = '/etc/samba/smb.conf'.$suffix;
     }
    $lpmlnew =~ s/\{\{\{\{\[(.*?)\]\}\}\}\}/$pvar{$1}/ge;
    open(OUT,'>'.$lpmlnew_file) or
       die('Cannot open '.$lpmlnew_file.' for output'."\n");
    print(OUT $lpmlnew);
    close(OUT);
         }
     }
   
   # --------------------------------- getsuffix: get the latest time stamp suffix
   # === INPUT:  filename without suffix
   # === OUTPUT: the latest time stamp suffix; 14 digits YYYYMMDDhhmmss
   # === ERROR:  cannot read the directory in which the filenames reside
   sub getsuffix ($)
     {
       my ($file) = @_;
       print("$file\n");
       my $dir = $file; $dir =~ s/([^\/]+)$//;
       my $filename = $1;
       opendir(DIR,$dir) or
    die('Cannot open directory '.$dir.' for viewing'."\n");
       my @a = grep {/$filename\.\d{14}/} readdir(DIR);
       closedir(DIR);
       map {s/$filename\.//;} @a;
       my @b = sort {$a<=>$b} @a;
       my $suffix = '.'.$b[$#b];
       return($suffix);
     }
   
   # -------------------------- readfile: get the file contents in a scalar string
   # === INPUT:  filename
   # === OUTPUT: the filename's contents
   # === ERROR:  cannot read the file
   # === NOTE:   big files will hog computer memory
   sub readfile ($)
     {
       my ($filename) = @_;
       my $contents = '';
       open(IN,'<'.$filename) or die ('Cannot read '.$filename."\n");
       while(<IN>) {$contents .= $_;}
       close(IN);
       return($contents);
     }
   
   =pod
   
   =head1 NAME
   
   B<loncaparestoreconfigurations> - restore data to new LON-CAPA conf files
   
   =head1 SYNOPSIS
   
    perl loncaparestoreconfigurations suffix .lpmlnew
   
   =head1 DESCRIPTION
   
   During software upgrades, it is possible that configuration files will change.
   It is important to "intelligently" preserve the machine-specific configuration
   data.  This script is meant to run B<after> the software upgrade.
   
   For example, consider the configuration file F<loncapa.conf>.
   During the software upgrade (not performed by by F<loncapa.conf>),
   the following happens:
   
    loncapa.conf is NOT overwritten
   
   rather,
   
    a NEW file B<loncapa.conf.lpmlnew> is GENERATED
    (cp UPGRADEDIR/loncapa.conf SYSTEMDIR/loncapa.conf.lpmlnew)
   
   This script can be described as:
   
   =over 4
   
   =item *
   
   modifying SYSTEMDIR/loncapa.conf.lpmlnew, and
   
   =item *
   
   the modification consists of reading values from the old loncapa.conf and
   placing them in loncapa.conf.lpmlnew.
   
   =back
   
   Regarding F<loncapa.conf>, for backwards compatibility, this script tries
   to read values out of F<access.conf>.
   
   This script also currently works with F<smb.conf> (a standard Linux
   configuration file associated with sharing the Linux filesystem with
   Windows machines).
   
   =head2 Working with the file suffix
   
   The script is designed to work according to two strategies.
   
   =over 4
   
   =item * B<aggressive update>
   
   In the aggressive update strategy, two things should happen:
   
   =over 4
   
   =item * The configuration file should be replaced
   
   Therefore, the system administrator "trusts" the software update process
   and this script to handle everything correctly.
   
   =item * Information should never be lost
   
   Therefore, a backup copy should be made that is unique to the time
   the action is taken and is never overwritten or destroyed by the
   automated process.
   
   =back
   
   =item * B<passive assistance>
   
   =over 4
   
   =item * The configuration file should not be replaced
   
   The system administrator does not trust the software update process.
   She would rather have a new file "intelligently" generated, and, only
   by her direct approval, have the new file substitute the contents
   of the current configuration file.
   
   =item * The script should try to help the system administrator
   
   Therefore, a new copy is made with the suffix ".lpmlnew".  This
   new copy is modified with data from the existing configuration file.
   The system administrator is prompted (by the rest of the software
   upgrade process) to resolve the new changes to the configuration
   file.
   
   =back
   
   =back
   
   Correspondingly,
   
    perl loncaparestoreconfigurations suffix .lpmlnew
   
   invokes this script in B<passive assistance> mode; whereas
   
    perl loncaparestoreconfigurations lasttimestamp
   
   invokes this script in B<aggressive update> mode.
   
   =head1 AUTHORS
   
   Scott Harrison
   
   This script is free software; you can redistribute it
   and/or modify it under the same terms as LON-CAPA itself.
   
   =cut
Removed from v.1.3  
changed lines
  Added in v.1.15

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