#! /usr/bin/perl
#                              -*- Mode: Cperl -*-
# config ---
# Author           : Manoj Srivastava ( srivasta@glaurung.internal.golden-gryphon.com )
# Created On       : Thu Nov  3 09:11:38 2005
# Created On Node  : glaurung.internal.golden-gryphon.com
# Last Modified By : Manoj Srivastava
# Last Modified On : Thu Nov  3 09:11:38 2005
# Last Machine Used: glaurung.internal.golden-gryphon.com
# Update Count     : 0
# Status           : Unknown, Use with caution!
# HISTORY          :
# Description      :
#
# arch-tag: 9a70bb3a-30d4-4f4c-96e7-d3feb9a9752e
#

use Debconf::Client::ConfModule qw(:all);
version('2.0');
$| = 1;

# Predefined values:
my $version           = "=V";
my $move_image        = '';     # target machine defined
my $kimage            = "=K";   # Should be empty, mostly
my $image_dir         = "=D";   # where the image is located
my $clobber_modules   = '';     # target machine defined
my $initrd            = "=I";   # initrd kernel
my $postinst_hook     = '';     #Normally we do not
my $postrm_hook       = '';     #Normally we do not
my $preinst_hook      = '';     #Normally we do not
my $prerm_hook        = '';     #Normally we do not
my $ignore_depmod_err = '';     # normally we do not
my $relink_src_link   = 'YES';  # There is no harm in checking the link
my $relink_build_link = 'YES';  # There is no harm in checking the link
my $force_build_link  = '';     # There is no harm in checking the link
my $arch              = "=A";   #  should be same as dpkg --print-architecture
my $kernel_arch       = "=B";
my $package_name = "=ST-image-$version";

#known variables
my $image_dest     = "/";
my $realimageloc   = "/$image_dir/";
my $have_conffile  = "";
my $silent_modules = '';
my $modules_base   = '/lib/modules';
my $CONF_LOC       = '/etc/kernel-img.conf';

# Ignore all invocations except when called on to configure.
exit 0 unless $ARGV[0] =~ /configure/;
chdir('/') or die "could not chdir to /:$!\n";

# remove multiple leading slashes; make sure there is at least one.
$realimageloc =~ s|^/*|/|o;
$realimageloc =~ s|/+|/|o;

if ( -r "$CONF_LOC" && -f "$CONF_LOC" ) {
  if ( open( CONF, "$CONF_LOC" ) ) {
    while (<CONF>) {
      chomp;
      s/\#.*$//g;
      next if /^\s*$/;

      $move_image        = "" if /move_image\s*=\s*(no|false|0)\s*$/ig;
      $clobber_modules   = '' if /clobber_modules\s*=\s*(no|false|0)\s*$/ig;
      $silent_modules    = '' if /silent_modules\s*=\s*(no|false|0)\s*$/ig;
      $ignore_depmod_err = '' if /ignore_depmod_err\s*=\s*(no|false|0)\s*$/ig;
      $relink_src_link   = '' if /relink_src_link\s*=\s*(no|false|0)\s*$/ig;
      $relink_build_link = '' if /relink_build_link\s*=\s*(no|false|0)\s*$/ig;
      $force_build_link  = '' if /force_build_link\s*=\s*(no|false|0)\s*$/ig;

      $move_image      = "Yes" if /move_image\s*=\s*(yes|true|1)\s*$/ig;
      $clobber_modules = "Yes" if /clobber_modules\s*=\s*(yes|true|1)\s*$/ig;
      $silent_modules  = 'Yes' if /silent_modules\s*=\s*(yes|true|1)\s*$/ig;
      $ignore_depmod_err = 'Yes'
        if /ignore_depmod_err\s*=\s*(yes|true|1)\s*$/ig;
      $relink_src_link = 'Yes' if /relink_src_link\s*=\s*(yes|true|1)\s*$/ig;
      $relink_build_link = 'Yes'
        if /relink_build_link\s*=\s*(yes|true|1)\s*$/ig;
      $force_build_link = 'Yes'
        if /force_build_link\s*=\s*(yes|true|1)\s*$/ig;

      $image_dest    = "$1" if /image_dest\s*=\s*(\S+)/ig;
      $postinst_hook = "$1" if /postinst_hook\s*=\s*(\S+)/ig;
      $postrm_hook   = "$1" if /postrm_hook\s*=\s*(\S+)/ig;
      $preinst_hook  = "$1" if /preinst_hook\s*=\s*(\S+)/ig;
      $prerm_hook    = "$1" if /prerm_hook\s*=\s*(\S+)/ig;
      $mkimage       = "$1" if /mkimage\s*=\s*(.+)$/ig;
      $ramdisk       = "$1" if /ramdisk\s*=\s*(.+)$/ig;
    } ## end while (<CONF>)
    close CONF;
    $have_conffile = "Yes";
  } ## end if ( open( CONF, "$CONF_LOC"...))
} ## end if ( -r "$CONF_LOC" &&...)

# For some versions of kernel-package, we had this warning in the
# postinst, but the rules did not really interpolate the value in.
# Here is a sanity check.
my $pattern = "=" . "I";
$initrd =~ s/^$pattern$//;

$image_dest = "$image_dest/";
$image_dest =~ s|/+$|/|o;

$ENV{KERNEL_ARCH} = $kernel_arch if $kernel_arch;

# Paranoid check to make sure that the correct value is put in there
if ( !$kimage ) { $kimage = "vmlinuz"; }    # Hmm. empty
elsif ( $kimage =~ m/^b?zImage$/o ) {
  $kimage = "vmlinuz";
}                                           # these produce vmlinuz
elsif ( $kimage =~ m/^[iI]mage$/o ) { my $nop = $kimage; }
elsif ( $kimage =~ m/^vmlinux$/o )  { my $nop = $kimage; }
elsif ( $kimage =~ m/^xen[0u]-linux$/o ) {
  $package_name = "${kimage}-$version";
}
elsif ( $kimage =~ m/^uImage$/msxo ) { my $nop = $kimage; }
else                                 { $kimage = "vmlinuz"; }    # Default

if ( -d "$kimage" ) {
  my $ret;
  my $seen;
  my $note = "${package_name}/postinst/kimage-is-a-directory";

  ( $ret, $seen ) = fset( "$note", 'seen', 'false' );
  die "Error setting debconf flags in $note: $seen" if $ret;

  $ret = subst( "$note", 'kimage', "$kimage" );
  die "Error setting debconf substitutions in $note: $seen" if $ret;

  $ret = subst( "$note", 'image_dest', "$image_dest" );
  die "Error setting debconf substitutions in $note: $seen" if $ret;

  ( $ret, $seen ) = input( 'critical', "$note" );
  if ( $ret && $ret != 30 ) {
    die "Error setting debconf note $note: $seen";
  }

  ( $ret, $seen ) = go();
  if ( $ret && $ret != 30 ) {
    die "Error asking debconf question $note: $seen";
  }
} ## end if ( -d "$kimage" )

# We used to have System.* files in /
if ( -e "/System.map" || -e "/System.old" ) {
  my $ret;
  my $seen;
  my $question = "${package_name}/postinst/old-dir-initrd-link-$version";

  ( $ret, $seen ) = input( 'medium', "$question" );
  if ( $ret && $ret != 30 ) {
    die "Error setting debconf question $question: $seen";
  }

  ( $ret, $seen ) = go();
  if ( $ret && $ret != 30 ) {
    die "Error asking debconf question $question: $seen";
  }
} ## end if ( -e "/System.map" ...)

exit 0;

__END__
