// DoDistUpgrade - Automatic smart upgrader				/*{{{*/
// ---------------------------------------------------------------------
/* Intelligent upgrader that will install and remove packages at will */
bool DoDistUpgrade(CommandLine &CmdL)
{
   return UpgradeHelper(CmdL, APT::Upgrade::ALLOW_EVERYTHING);
}
									/*}}}*/
bool DoUpgrade(CommandLine &CmdL)					/*{{{*/
{
   if (_config->FindB("APT::Get::Upgrade-Allow-New", false) == true)
      return DoUpgradeWithAllowNewPackages(CmdL);
   else
      return DoUpgradeNoNewPackages(CmdL);
}
									/*}}}*/
// DoUpgradeNoNewPackages - Upgrade all packages			/*{{{*/
// ---------------------------------------------------------------------
/* Upgrade all packages without installing new packages or erasing old
   packages */
bool DoUpgradeNoNewPackages(CommandLine &CmdL)
{
   // Do the upgrade
   return UpgradeHelper(CmdL, 
                        APT::Upgrade::FORBID_REMOVE_PACKAGES|
                        APT::Upgrade::FORBID_INSTALL_NEW_PACKAGES);
}
									/*}}}*/
// DoSafeUpgrade - Upgrade all packages with install but not remove	/*{{{*/
bool DoUpgradeWithAllowNewPackages(CommandLine &CmdL)
{
   return UpgradeHelper(CmdL, APT::Upgrade::FORBID_REMOVE_PACKAGES);
}

Warm-up