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#!/usr/bin/perl -w

use Errno;
use strict;

$ENV{'EMACS_INHIBIT_AUTOMATIC_NATIVE_COMPILATION'} = 't';

my $lib_dir = "/usr/lib/emacsen-common";
my $invoked_by_old_pkg;
my $context;
my $flavor;

require $lib_dir . "/lib.pl";

umask 0022 or die "emacs-install: can't set umask, aborting.";

sub usage
{
  my($file_handle) = @_;
  if($invoked_by_old_pkg)
  {
    print $file_handle "Usage: emacs-install FLAVOR\n";
  }
  else
  {
    print $file_handle "Usage: emacs-install (--preinst|--postinst) FLAVOR\n";
  }
}

if(scalar(@ARGV) == 1)
{
  $invoked_by_old_pkg = 1;
  $flavor = $ARGV[0];
  $context = 'postinst;'
}
elsif (scalar(@ARGV) == 2)
{
  if($ARGV[0] eq '--preinst') { $context = 'preinst'; }
  elsif($ARGV[0] eq '--postinst') { $context = 'postinst'; }
  else
  {
    usage(*STDERR{IO});
    exit(1);
  }
  $flavor = $ARGV[1];
}
else
{
  usage(*STDERR{IO});
  exit(1);
}

if($context eq 'preinst')
{
  my $f = "$::installed_flavor_state_dir/$flavor";
  unlink("$f");
  die "ERROR: cannot unlink $f: $!, " unless (unlink($f) or $!{ENOENT});
  exit(0);
}

# Must be --postinst.

my @installed_flavors = get_installed_flavors();

# Mark as safe to include in list of flavors for package setup.
ex('touch', "$::installed_flavor_state_dir/$flavor");

my @ordered_pkg_list =
    generate_add_on_install_list(get_installed_add_on_packages());

foreach my $pkg (@ordered_pkg_list)
{
  print "Install $pkg for $flavor\n";
  my $script = $lib_dir . "/packages/install/$pkg";
  my $failed;
  if(-e "$lib_dir/packages/compat/$pkg") # New-style package.
  {
    $failed = -e $script && (system($script, $flavor) != 0);
  }
  else # Old-style package.
  {
    $failed = -e $script && (system($script, $flavor, @installed_flavors) != 0);
  }
  if($failed)
  {
    print STDERR "ERROR: install script from $pkg package failed\n";
    exit(1);
  }
}