#! /usr/bin/perl
#                              -*- Mode: Perl -*-
# debian.postinst ---
# Author           : Manoj Srivastava ( srivasta@pilgrim.umass.edu )
# Created On       : Tue May 21 23:15:26 1996
# Created On Node  : melkor.pilgrim.umass.edu
# Last Modified By : Manoj Srivastava
# Last Modified On : Mon Apr 19 01:42:02 2004
# Last Machine Used: glaurung.internal.golden-gryphon.com
# Update Count     : 65
# Status           : Unknown, Use with caution!
# HISTORY          :
# Description      :
#
#
# arch-tag: 5401e9ef-39cc-4aee-96a4-61dfb8f32cf7
#

$|=1;
# Ignore all invocations uxcept when called on to configure.
exit 0 unless $ARGV[0] =~ /configure/;

my $have_debconf = 0;
eval {require Debconf::Client::ConfModule;};
if ( ! $@ )
{
  $have_debconf++;
  import Debconf::Client::ConfModule ':all';
}

sub handle_org (){
  my $ret;

  return 1 if -f "/etc/news/organization";
  print STDERR "\n";
  print STDERR "Hmmm.. You don't seem to have an /etc/news/organization file.\n";
  print STDERR "Usually that contains the name of your organization as \n";
  print STDERR "you want it to appear on the Organization line of outgoing\n";
  print STDERR "articles/patches.\n";
  print STDERR "\n";
  if (! -d "/etc/news") {
    $ret = &create_newsdir();
    if ($ret) {
      warn $ret;
      return 0;
    }
  }
  if (-f "/etc/organization") {
    $ret = &docopy();
    if ($ret) {
      warn $ret;
      return 0;
    }
    return 1;
  }
  $ret = &get_orgname();
  if ($ret) {
    warn $ret;
    return 0;
  }
  return 1;
}

sub warn_org (){
  print STDERR "\n";
  print STDERR "There was an error setting up /etc/news/organization to\n";
  print STDERR "contain the name of your organization as you want\n";
  print STDERR "it to appear on the Organization line of outgoing\n";
  print STDERR "articles/patches. Please ensure manually that the file\n";
  print STDERR "/etc/news/organization is set up properly.\n";
  print STDERR "Please hit return to continue:";
  my $ans = <STDIN>;
}

sub docopy (){
  my $ret;

  print STDERR "But you do have /etc/organization.  I'll Use that.\n";
  print STDERR "If that is not right, just edit /etc/news/organization \n";
  print STDERR "after the setup is done. (/etc/organization is deprecated.\n";
  print STDERR "You might consider removing it if nothing else uses it).\n";
  print STDERR "\n";
  $ret = system 'cp', '/etc/organization', '/etc/news/organization';
  if ($ret) {
    return "Could not copy file /etc/organization to /etc/news, " .
      ($ret >> 8);
  }
  return &set_perms();
}

sub get_orgname() {
  return if -e "/etc/news/organization";
  my $orgname;

  if ( ! $have_debconf ) {
    # No debconf
    print STDERR <<"EOH";

Please type the name of your organization as you want it to appear on
the Organization line of outgoing articles/patches.  (It's nice if
this also specifies your location.  Your city name is probably
sufficient if well known.) For example:

    University of Southern North Dakota, Hoople
Type in "--none--" if you do not want to specify one.

EOH
;
    chomp ($orgname=<STDIN>);
  }
  else {

    my $ret;
    my $seen;

    ($ret,$orgname) = get ("share/news/organization");
    if ($ret) {
      ($ret,$seen) = fget ("share/news/organization", 'seen');
      if ($seen  eq 'true') {
	if ($orgname eq "--none--") {
	  $orgname = '';
	}
      }
      else {
	$orgname = '';
      }
      # I no longer claim this question
      unregister("share/news/organization");
    }
    else {
      ($ret,$seen) = fget ("shared/news/organization", 'seen');
      if ($seen  eq 'true') {
	# The user saw and answered the question using debconf.
	($ret,$orgname) = get ("shared/news/organization");
	if ($orgname eq "--none--") {
	  $orgname = '';
	}
	else {
	  print STDERR "Using org Name $orgname\n";
	}
      }
      else {
	# Debconf did not display the question to the user.
	print STDERR "Hmm. Apparently, Debconf did not display the question\n";
	print STDERR "Not setting org name\n";
	$orgname = '';
      }
    }
  }
  if ($orgname =~ m/^--none--$/) {
    $orgname = '';
  }

  if ($orgname) {
    if (! open (ORGS, ">/etc/news/organization")) {
      return "Could not open /etc/news/organization:$!";
    }
    print ORGS "$orgname\n";
    close (ORGS);
    return &set_perms();
  }
  return '';
}

sub set_perms () {
  my $ret;
  my ($name,$passwd,$gid,$members);
  ($name,$passwd,$gid,$members) = getgrnam("news");
  $ret = chown 0, $gid, "/etc/news/organization";
  if ($ret != 1) {
    return "Could not chown /etc/news/organization:$!";
  }
  $ret = chmod 0644, "/etc/news/organization";
  if ($ret != 1) {
    return "Could not chmod 0644 /etc/news/organization:$!";
  }
  return '';
}

sub create_newsdir () {
  umask 0000;
  my $ret = mkdir "/etc/news", 02755;
  return "Could not create /etc/news:($ret)$!" if ! $ret;
  my ($name,$passwd,$gid,$members);
  ($name,$passwd,$gid,$members) = getgrnam("news");
  $ret = chown 0, $gid, "/etc/news";
  if ($ret != 1) {
    return "Could not chown /etc/news:$!";
  }
  return '';
}


sub get_hostcat()  {
  my $hostcat = "cat /etc/hosts";
  if (-d "/var/yp" || -d "/usr/etc/yp" || -d "/etc/yp") {
    if (&ask_n("Do you get the hosts file via NetInfo")) {
      $hostcat="nidump hosts .";
    }
    else {
      my $found = '';
      #test to see if /etc/passwd contains a + line
      open (PASS, "/etc/passwd") || return '';
      $found='';
      while (<PASS>) {
	chomp;
	$found++, last if /^\+/o;
      }
      close (PASS);
      if (&ask_y("Are you getting the hosts file via yellow pages")) {
	$hostcat = "ypcat hosts";
      }
    }
  }
  return $hostcat;
}

sub get_hostname()  {
  my $hostname = '';
  if (-x "/bin/hostname") {
    $hostname=`/bin/hostname 2>&1`;
    if ($?) {
      $hostname="";
    }
    else {
      chomp($hostname);
      $hostname =~ tr/[A-Z]/[a-z]/;
      $hostname =~ s/^([^\.]+)\..*/$1/o;
      return $hostname;
    }
  }
  if (-x "/bin/uname") {
    $hostname=`/bin/uname -n 2>&1`;
    if ($?) {
      $hostname="";
    }
    else {
      chomp($hostname);
      $hostname =~ tr/[A-Z]/[a-z]/;
      $hostname =~ s/^([^\.]+)\..*/$1/o;
      return $hostname;
    }
  }
  print STDERR "Please type the (one word) name of your host:";
  $hostname=<STDIN>;
  chomp ($hostname);
  $hostname =~ tr/[A-Z]/[a-z]/;
  $hostname =~ s/^([^\.]+)\..*/$1/o;
  $hostname =~ s/^(\S+).*/$1/o;
  return $hostname;
}

sub get_domainname()  {
  my $domainname = '';
  my $hostcat = '';
  my $hostname = '';

  if (-x "/bin/dnsdomainname") {
    $domainname = `/bin/dnsdomainname 2>&1 `;
    if ($?) {
      $domainname="";
    }
    else {
      chomp($domainname);
      $domainname =~ tr/[A-Z]/[a-z]/;
      return $domainname;
    }
  }
  $hostname = &get_hostname();
  $hostcat = &get_hostcat();
  if (open (HOSTS, "$hostcat |")) {

    while (<HOSTS>) {
      chomp;
      if (/^[\d\.]+\s+($hostname.*)/o) {
	my $rest;
	my @names;

	$rest = $1;
	@names = split('\s+', $rest);
	for (@names) {
	  if (/$hostname\.(\S+)/o) {
	    $domainname = $1;
	    close (HOSTS);
	    return $domainname;
	  }
	}
      }
    }
    close (HOSTS);
  }
  if (-f "/etc/resolv.conf") {
    if (open (RESOLV, "/etc/resolv.conf")) {
      while (<RESOLV>) {
	chomp;
	if (/^\s*domain\s+(\S+)/o) {
	  $domainname = "$1";
	  close (RESOLV);
	  return $domainname;
	}
      }
      close (RESOLV);
    }
  }

  print STDERR "What is your domain name?:";
  $domainname = <STDIN>;
  chomp ($domainname);
  return $domainname;
}

sub ask_n {
  my $answer;
  print @_,"? [No] ";
  $answer=<STDIN>;
  return ( $answer =~ /^[yY].*/ );
}

sub ask_y {
  my $answer;
  print @_,"? [Yes] ";
  $answer=<STDIN>;
  return ( $answer !~ /^[Nn].*/ );
}

sub handle_doc_symlink {
  my $linktarget = "../share/doc/mailagent";
  if (-d "/usr/doc") {
    # Well, we still need to handle this, at least for the time being
    if (-l "/usr/doc/mailagent") {
      unlink "/usr/doc/mailagent";
    }
    my $targetdir;
    my $stargetdir;

    if (-x '/bin/pwd') {
      chdir('/usr/doc/');
      $targetdir=`/bin/pwd`;
      chdir('/usr/share/doc/');
      $stargetdir=`/bin/pwd`;
      chdir('/');

      chdir('/usr/doc');
      if (-f '../share/doc/') {
        chdir('../share/doc/');
        my $ltarget=`/bin/pwd`;
        if ($ltarget ne $stargetdir) {
          $linktarget = "/usr/share/doc/mailagent";
        }
      }
    }
    if ($targetdir ne $stargetdir) {
      if (-d "/usr/share/doc/mailagent") {
	# So the new doc dir exists, goody
	if (-d "/usr/doc/mailagent") {
	  print STDERR "Yikes! The old directory, /usr/doc/mailagent\n";
	  print STDERR "has not ben removed! This is an error; attempting\n";
	  print STDERR "repairs";
	  if (-f "/usr/doc/mailagent/.dhelp") {
	    unlink "/usr/doc/mailagent/.dhelp";
	    rmdir "/usr/doc/mailagent";
	  }
	  if (-d "/usr/doc/mailagent") {
	    print STDERR <<"EOFERRONE";
Failed repairs. There are old files in /usr/doc/mailagent/ created
by you or another script. I can copy them over to the new location
/usr/share/doc/$package_name, if you wish, preserving your versions of
the files.  No files shall be over written, instead, backup versions
shall be created in /usr/share/doc/$package_name as needed.

EOFERRONE
  ;
	    my $answer='';
	    print "Shall I copy the files over [Yn]?";
	    $answer=<STDIN>;
	    if ($answer =~ /^n/i) {
	      print "Not copying over, aborting\n";
	      return 1;
	    }
	    else {
	      system "cp", "-a", "--backup=t",
	      "/usr/doc/mailagent",
	      "/usr/share/doc/mailagent/.." || do {
		warn "Error copying files over: $?";
		return 1;
	      };

	      system "rm", "-rf", "/usr/doc/mailagent" || do {
		warn "Error removing old directory:$?";
		return 1;
	      };

	    }
	  }
	}
	if (-e "/usr/doc/mailagent") {
	  print STDERR "/usr/doc/mailagent exists, but is not a directory\n";
	  if (-l "/usr/doc/mailagent") {
	    print STDERR "It is a symbolic link. Overwriting\n";
	    unlink "/usr/doc/mailagent";
	    symlink $linktarget, "/usr/doc/mailagent";
	  }
	  else {
	    print STDERR "This is an error. Aborting\n";
	    return 1;
	  }
	}
	# File unexists. Free to go ahead and create link
	symlink $linktarget, "/usr/doc/mailagent";
      }
    }
  }
  else {
    # Hmm. no dir.
    warn "No /usr/doc directory found, no symlinks made.";
    return 1;
  }
}

sub edit_mailagent(){
  my $domainname = &get_domainname();
  open (MAILAGENT, "/usr/bin/mailagent") || do {
    warn "Could not open /usr/bin/mailagent executable to fix domains:$!";
    return 0;
  };

  open (NEW, ">/usr/bin/mailagent.fixed") || do {
    warn "Could not create /usr/bin/mailagent.fixed to fix domains:$!";
    return 0;
  };

  while (<MAILAGENT>) {
    chomp;
    if (/^\$mydomain = \'([^\']+)\'/o) {
      my $compiled_domain = $1;
      if ("$compiled_domain" ne ".$domainname") {
	s/^(\$mydomain = \')([^\']+)(\'.*)/$1.$domainname$3/o;
      }
    }
    print NEW "$_\n";
  }
  close (MAILAGENT);
  close (NEW);
  rename "/usr/bin/mailagent","/usr/bin/mailagent.old" || do {
    warn "Could not rename /usr/bin/mailagent executable to fix domains:$!";
    return 0;
  };

  chmod 0755, "/usr/bin/mailagent.fixed" || do {
    warn "Could not chmod 0755 /usr/bin/mailagent.fixed:$!";
    return 0;
  };

  rename "/usr/bin/mailagent.fixed","/usr/bin/mailagent" || do {
    warn "Could not rename /usr/bin/mailagent.fixed to fix domains:$!";
    return 0;
  };
  unlink "/usr/bin/mailagent.old";
  return 1;
}

sub warn_agent (){
  print "\n";
  print "There was an error setting while I was trying to edit\n";
  print "your domain name into /usr/bin/mailagent.  This is not\n";
  print "critical, mailagent will just report that it is being run\n";
  print "on a machine in the domain that this package was built on.\n";
  print "If you find this irritating, please edit /usr/bin/mailagent\n";
  print "and change the line\n";
  print "\$mydomain = '.blah.blah';\n";
  print "to your own domain.\n";
  print "Please hit return to continue:";
  my $ans = <STDIN>;
}
sub warn_doc_symlink  (){
  print "\n";
  print "There was an error setting a symbolic link from the directory\n";
  print "/usr/share/doc/mailagent to /usr/doc/mailagent. Please create\n";
  print "the symlink manually, perhaps by doing\n";
  print "the symlink manually, perhaps by doing\n";
  print "\t\t# ln -s /usr/share/doc/mailagent /usr/doc/mailagent\n";
  print "Please hit return to continue:";
  my $ans = <STDIN>;
}

&handle_org() || &warn_org();
# &handle_doc_symlink || &warn_doc_symlink;
# &edit_mailagent() || &warn_agent();



__END__