Initial commit from my GSoC project. Added a verification function (VerifyConfigure...

[apt.git] / apt-pkg / packagemanager.cc

// -*- mode: cpp; mode: fold -*-
// Description								/*{{{*/
// $Id: packagemanager.cc,v 1.30 2003/04/27 03:04:15 doogie Exp $
/* ######################################################################

   Package Manager - Abstacts the package manager

   More work is needed in the area of transitioning provides, ie exim
   replacing smail. This can cause interesing side effects.

   Other cases involving conflicts+replaces should be tested. 
   
   ##################################################################### */
									/*}}}*/
// Include Files							/*{{{*/
#include <apt-pkg/packagemanager.h>
#include <apt-pkg/orderlist.h>
#include <apt-pkg/depcache.h>
#include <apt-pkg/error.h>
#include <apt-pkg/version.h>
#include <apt-pkg/acquire-item.h>
#include <apt-pkg/algorithms.h>
#include <apt-pkg/configuration.h>
#include <apt-pkg/sptr.h>
    
#include <apti18n.h>    
#include <iostream>
#include <fcntl.h> 
									/*}}}*/
using namespace std;

// PM::PackageManager - Constructor					/*{{{*/
// ---------------------------------------------------------------------
/* */
pkgPackageManager::pkgPackageManager(pkgDepCache *pCache) : Cache(*pCache)
{
   FileNames = new string[Cache.Head().PackageCount];
   List = 0;
   Debug = _config->FindB("Debug::pkgPackageManager",false);
}
									/*}}}*/
// PM::PackageManager - Destructor					/*{{{*/
// ---------------------------------------------------------------------
/* */
pkgPackageManager::~pkgPackageManager()
{
   delete List;
   delete [] FileNames;
}
									/*}}}*/
// PM::GetArchives - Queue the archives for download			/*{{{*/
// ---------------------------------------------------------------------
/* */
bool pkgPackageManager::GetArchives(pkgAcquire *Owner,pkgSourceList *Sources,
				    pkgRecords *Recs)
{
   if (CreateOrderList() == false)
      return false;
   
   bool const ordering =
	_config->FindB("PackageManager::UnpackAll",true) ?
		List->OrderUnpack() : List->OrderCritical();
   if (ordering == false)
      return _error->Error("Internal ordering error");

   for (pkgOrderList::iterator I = List->begin(); I != List->end(); I++)
   {
      PkgIterator Pkg(Cache,*I);
      FileNames[Pkg->ID] = string();
      
      // Skip packages to erase
      if (Cache[Pkg].Delete() == true)
	 continue;

      // Skip Packages that need configure only.
      if (Pkg.State() == pkgCache::PkgIterator::NeedsConfigure && 
	  Cache[Pkg].Keep() == true)
	 continue;

      // Skip already processed packages
      if (List->IsNow(Pkg) == false)
	 continue;

      new pkgAcqArchive(Owner,Sources,Recs,Cache[Pkg].InstVerIter(Cache),
			FileNames[Pkg->ID]);
   }

   return true;
}
									/*}}}*/
// PM::FixMissing - Keep all missing packages				/*{{{*/
// ---------------------------------------------------------------------
/* This is called to correct the installation when packages could not
   be downloaded. */
bool pkgPackageManager::FixMissing()
{   
   pkgDepCache::ActionGroup group(Cache);
   pkgProblemResolver Resolve(&Cache);
   List->SetFileList(FileNames);

   bool Bad = false;
   for (PkgIterator I = Cache.PkgBegin(); I.end() == false; I++)
   {
      if (List->IsMissing(I) == false)
	 continue;
   
      // Okay, this file is missing and we need it. Mark it for keep 
      Bad = true;
      Cache.MarkKeep(I, false, false);
   }
 
   // We have to empty the list otherwise it will not have the new changes
   delete List;
   List = 0;
   
   if (Bad == false)
      return true;
   
   // Now downgrade everything that is broken
   return Resolve.ResolveByKeep() == true && Cache.BrokenCount() == 0;   
}
									/*}}}*/
// PM::ImmediateAdd - Add the immediate flag recursivly			/*{{{*/
// ---------------------------------------------------------------------
/* This adds the immediate flag to the pkg and recursively to the
   dependendies 
 */
void pkgPackageManager::ImmediateAdd(PkgIterator I, bool UseInstallVer, unsigned const int &Depth)
{
   DepIterator D;
   
   if(UseInstallVer)
   {
      if(Cache[I].InstallVer == 0)
	 return;
      D = Cache[I].InstVerIter(Cache).DependsList(); 
   } else {
      if (I->CurrentVer == 0)
	 return;
      D = I.CurrentVer().DependsList(); 
   }

   for ( /* nothing */  ; D.end() == false; D++)
      if (D->Type == pkgCache::Dep::Depends || D->Type == pkgCache::Dep::PreDepends)
      {
	 if(!List->IsFlag(D.TargetPkg(), pkgOrderList::Immediate))
	 {
	    if(Debug)
	       clog << OutputInDepth(Depth) << "ImmediateAdd(): Adding Immediate flag to " << D.TargetPkg() << " cause of " << D.DepType() << " " << I.Name() << endl;
	    List->Flag(D.TargetPkg(),pkgOrderList::Immediate);
	    ImmediateAdd(D.TargetPkg(), UseInstallVer, Depth + 1);
	 }
      }
   return;
}
									/*}}}*/
// PM::CreateOrderList - Create the ordering class			/*{{{*/
// ---------------------------------------------------------------------
/* This populates the ordering list with all the packages that are
   going to change. */
bool pkgPackageManager::CreateOrderList()
{
   if (List != 0)
      return true;
   
   delete List;
   List = new pkgOrderList(&Cache);
   
   static bool const NoImmConfigure = !_config->FindB("APT::Immediate-Configure",true);
   
   // Generate the list of affected packages and sort it
   for (PkgIterator I = Cache.PkgBegin(); I.end() == false; I++)
   {
      // Ignore no-version packages
      if (I->VersionList == 0)
	 continue;
      
      // Mark the package and its dependends for immediate configuration
      if (((I->Flags & pkgCache::Flag::Essential) == pkgCache::Flag::Essential ||
	   (I->Flags & pkgCache::Flag::Important) == pkgCache::Flag::Important) &&
	  NoImmConfigure == false)
      {
	 if(Debug)
	    clog << "CreateOrderList(): Adding Immediate flag for " << I.Name() << endl;
	 List->Flag(I,pkgOrderList::Immediate);

	 // Look for other install packages to make immediate configurea
	 ImmediateAdd(I, true);
	 
	 // And again with the current version.
	 ImmediateAdd(I, false);
      }
      
      // Not interesting
      if ((Cache[I].Keep() == true || 
	  Cache[I].InstVerIter(Cache) == I.CurrentVer()) && 
	  I.State() == pkgCache::PkgIterator::NeedsNothing &&
	  (Cache[I].iFlags & pkgDepCache::ReInstall) != pkgDepCache::ReInstall &&
	  (I.Purge() != false || Cache[I].Mode != pkgDepCache::ModeDelete ||
	   (Cache[I].iFlags & pkgDepCache::Purge) != pkgDepCache::Purge))
	 continue;
      
      // Append it to the list
      List->push_back(I);      
   }
   
   return true;
}
									/*}}}*/
// PM::DepAlwaysTrue - Returns true if this dep is irrelevent		/*{{{*/
// ---------------------------------------------------------------------
/* The restriction on provides is to eliminate the case when provides
   are transitioning between valid states [ie exim to smail] */
bool pkgPackageManager::DepAlwaysTrue(DepIterator D)
{
   if (D.TargetPkg()->ProvidesList != 0)
      return false;
   
   if ((Cache[D] & pkgDepCache::DepInstall) != 0 &&
       (Cache[D] & pkgDepCache::DepNow) != 0)
      return true;
   return false;
}
									/*}}}*/
// PM::CheckRConflicts - Look for reverse conflicts			/*{{{*/
// ---------------------------------------------------------------------
/* This looks over the reverses for a conflicts line that needs early
   removal. */
bool pkgPackageManager::CheckRConflicts(PkgIterator Pkg,DepIterator D,
					const char *Ver)
{
   for (;D.end() == false; D++)
   {
      if (D->Type != pkgCache::Dep::Conflicts &&
	  D->Type != pkgCache::Dep::Obsoletes)
	 continue;

      // The package hasnt been changed
      if (List->IsNow(Pkg) == false)
	 continue;
      
      // Ignore self conflicts, ignore conflicts from irrelevent versions
      if (D.ParentPkg() == Pkg || D.ParentVer() != D.ParentPkg().CurrentVer())
	 continue;
      
      if (Cache.VS().CheckDep(Ver,D->CompareOp,D.TargetVer()) == false)
	 continue;

      if (EarlyRemove(D.ParentPkg()) == false)
	 return _error->Error("Reverse conflicts early remove for package '%s' failed",
			      Pkg.Name());
   }
   return true;
}
									/*}}}*/
// PM::ConfigureAll - Run the all out configuration			/*{{{*/
// ---------------------------------------------------------------------
/* This configures every package. It is assumed they are all unpacked and
   that the final configuration is valid. */
bool pkgPackageManager::ConfigureAll()
{
   pkgOrderList OList(&Cache);
   
   // Populate the order list
   for (pkgOrderList::iterator I = List->begin(); I != List->end(); I++)
      if (List->IsFlag(pkgCache::PkgIterator(Cache,*I),
		       pkgOrderList::UnPacked) == true)
	 OList.push_back(*I);
   
   if (OList.OrderConfigure() == false)
      return false;

   std::string const conf = _config->Find("PackageManager::Configure","all");
   bool const ConfigurePkgs = (conf == "all");

   // Perform the configuring
   for (pkgOrderList::iterator I = OList.begin(); I != OList.end(); I++)
   {
      PkgIterator Pkg(Cache,*I);

      if (ConfigurePkgs == true && VerifyConfigure(Pkg) == false)
	 return false;
      
      List->Flag(Pkg,pkgOrderList::Configured,pkgOrderList::States);
   }
   
   return true;
}
									/*}}}*/
// PM::SmartConfigure - Perform immediate configuration of the pkg	/*{{{*/
// ---------------------------------------------------------------------
/* This routine scheduals the configuration of the given package and all
   of it's dependents. */
bool pkgPackageManager::SmartConfigure(PkgIterator Pkg)
{
   if (Debug == true)
      clog << "SmartConfigure " << Pkg.Name() << endl;

   pkgOrderList OList(&Cache);

   if (DepAdd(OList,Pkg) == false)
      return false;

   static std::string const conf = _config->Find("PackageManager::Configure","all");
   static bool const ConfigurePkgs = (conf == "all" || conf == "smart");

   if (ConfigurePkgs == true)
      if (OList.OrderConfigure() == false)
	 return false;

   // Perform the configuring
   for (pkgOrderList::iterator I = OList.begin(); I != OList.end(); I++)
   {
      PkgIterator Pkg(Cache,*I);
      
      if (ConfigurePkgs == true && VerifyConfigure(Pkg) == false)
	 return false;
      
      List->Flag(Pkg,pkgOrderList::Configured,pkgOrderList::States);
   }

   if (Cache[Pkg].InstVerIter(Cache)->MultiArch == pkgCache::Version::Same)
      for (PkgIterator P = Pkg.Group().PackageList();
	   P.end() == false; P = Pkg.Group().NextPkg(P))
      {
	 if (Pkg == P || List->IsFlag(P,pkgOrderList::Configured) == true ||
	     Cache[P].InstallVer == 0 || (P.CurrentVer() == Cache[P].InstallVer &&
	      (Cache[Pkg].iFlags & pkgDepCache::ReInstall) != pkgDepCache::ReInstall))
	    continue;
	 SmartConfigure(P);
      }

   // Sanity Check
   if (List->IsFlag(Pkg,pkgOrderList::Configured) == false)
      return _error->Error(_("Could not perform immediate configuration on '%s'. "
			"Please see man 5 apt.conf under APT::Immediate-Configure for details. (%d)"),Pkg.Name(),1);

   return true;
}

// PM::VerifyConfigure - Check configuration of dependancies     /*{{{*/
// ---------------------------------------------------------------------
/* This routine checks that all a packages dependancies have been 
   configured, before it is going to be configured. If this gives a warning 
   on a virtual package, it means that the package thats providing it is not
   configured*/
bool pkgPackageManager::VerifyConfigure(PkgIterator Pkg, pkgOrderList &OList)
{
   // If this is true at the end, then the package should not be configured
   bool error=true;
   // This holds the the OR status of the previous dependancy  
   bool previousOr=false;

   // First iterate through the dependancies of Pkg
   for (DepIterator D = Cache[Pkg].InstVerIter(Cache).DependsList(); D.end() == false; D++)
   {
      
      /* If the dependancy is of type Depends or PreDepends, we need to check it, but only if it is going to be 
         configured at some point */
      if (D->Type == pkgCache::Dep::Depends || D->Type == pkgCache::Dep::PreDepends) {
         
         /* If the previous package and this package are OR dependancies, and the previous package satisfied the dependancy
            then skip this dependancy as it is not relevent, this will repeat for the next package if the situation is the 
            same */
         if (previousOr && !error) { // As error has not been reset, this refers to the previous dependancy 
            previousOr = (D->CompareOp & pkgCache::Dep::Or) == pkgCache::Dep::Or;
            continue;
         }
        
         // Reset error
         error = true;

         // Check thorugh all possible versions of this dependancy (D)
         SPtrArray<Version *> VList = D.AllTargets();
	 for (Version **I = VList; *I != 0; I++)
	 {
	    VerIterator DepVer(Cache,*I);
	    PkgIterator DepPkg = DepVer.ParentPkg();
	    VerIterator DepInstallVer(Cache,Cache[DepPkg].InstallVer);
	    
	    if (DepPkg.CurrentVer() == DepVer && !List->IsFlag(DepPkg,pkgOrderList::UnPacked)) {
	       clog << "Version " << DepPkg.CurrentVer() << " is installed on the system, satifying this dependancy" << endl;
	       error=false;
	       break;
	    }
	    
	    if (Cache[DepPkg].InstallVer == DepVer && 
	       (List->IsFlag(DepPkg,pkgOrderList::Configured) || OList.IsFlag(DepPkg,pkgOrderList::InList))) {
	       clog << "Version " << DepInstallVer.VerStr() << " is going to be installed on the system, satifying this dependancy" << endl;
	       error=false;
	       break;
	    }
	 }

         /* Only worry here if this package is a OR with the next, as even though this package does not satisfy the OR
            the next one might */
         if (error && !((D->CompareOp & pkgCache::Dep::Or) == pkgCache::Dep::Or)) {
             _error->Error("Package %s should not be configured because package %s is not configured",Pkg.Name(),D.TargetPkg().Name());
             return false; 
         /* If the previous package is a OR but not this package, but there is still an error then fail as it will not
            be satisfied */    
         } else if (error && previousOr && !((D->CompareOp & pkgCache::Dep::Or) == pkgCache::Dep::Or)) {
             _error->Error("Package %s should not be configured because package %s (or any alternatives) are not configured",Pkg.Name(),D.TargetPkg().Name());
             return false; 
         }
         
         previousOr = (D->CompareOp & pkgCache::Dep::Or) == pkgCache::Dep::Or;
      } else {
         previousOr=false;
      }
   }
   return true;
}

// PM::VerifyAndConfigure - Check configuration of dependancies     /*{{{*/
// ---------------------------------------------------------------------
/* This routine verifies if a package can be configured and if so 
   configures it  */
bool pkgPackageManager::VerifyAndConfigure(PkgIterator Pkg, pkgOrderList &OList)
{
   if (VerifyConfigure(Pkg, OList))
      return Configure(Pkg);
   else
      return false;
   
}
									/*}}}*/
// PM::DepAdd - Add all dependents to the oder list			/*{{{*/
// ---------------------------------------------------------------------
/* This recursively adds all dependents to the order list */
bool pkgPackageManager::DepAdd(pkgOrderList &OList,PkgIterator Pkg,int Depth)
{
   if (OList.IsFlag(Pkg,pkgOrderList::Added) == true)
      return true;
   if (List->IsFlag(Pkg,pkgOrderList::Configured) == true)
      return true;
   if (List->IsFlag(Pkg,pkgOrderList::UnPacked) == false)
      return false;

   if (Debug) 
      std::clog << OutputInDepth(Depth) << "DepAdd: " << Pkg.Name() << std::endl;
      
   // Put the package on the list
   OList.push_back(Pkg);
   OList.Flag(Pkg,pkgOrderList::Added);
   Depth++;

   // Check the dependencies to see if they are all satisfied.
   bool Bad = false;
   for (DepIterator D = Cache[Pkg].InstVerIter(Cache).DependsList(); D.end() == false;)
   {
      if (D->Type != pkgCache::Dep::Depends && D->Type != pkgCache::Dep::PreDepends)
      {
	 D++;
	 continue;
      }
      
      // Grok or groups
      Bad = true;
      for (bool LastOR = true; D.end() == false && LastOR == true; D++)
      {
	 LastOR = (D->CompareOp & pkgCache::Dep::Or) == pkgCache::Dep::Or;
	 
	 if (Bad == false)
	    continue;

	 SPtrArray<Version *> VList = D.AllTargets();
	 for (Version **I = VList; *I != 0 && Bad == true; I++)
	 {
	    VerIterator Ver(Cache,*I);
	    PkgIterator Pkg = Ver.ParentPkg();

	    // See if the current version is ok
	    if (Pkg.CurrentVer() == Ver && List->IsNow(Pkg) == true && 
		Pkg.State() == PkgIterator::NeedsNothing)
	    {
	       Bad = false;
	       continue;
	    }
	    
	    // Not the install version 
	    if (Cache[Pkg].InstallVer != *I || 
		(Cache[Pkg].Keep() == true && Pkg.State() == PkgIterator::NeedsNothing))
	       continue;
	    
	    if (List->IsFlag(Pkg,pkgOrderList::UnPacked) == true)
	       Bad = !DepAdd(OList,Pkg,Depth);
	    if (List->IsFlag(Pkg,pkgOrderList::Configured) == true)
	       Bad = false;
	 }
      }
      
      if (Bad == true)
      {
	 if (Debug) 
	    std::clog << OutputInDepth(Depth) << "DepAdd FAILS on: " << Pkg.Name() << std::endl;
	 OList.Flag(Pkg,0,pkgOrderList::Added);
	 OList.pop_back();
	 Depth--;
	 return false;
      }
   }
   
   Depth--;
   return true;
}
									/*}}}*/
// PM::EarlyRemove - Perform removal of packages before their time	/*{{{*/
// ---------------------------------------------------------------------
/* This is called to deal with conflicts arising from unpacking */
bool pkgPackageManager::EarlyRemove(PkgIterator Pkg)
{
   if (List->IsNow(Pkg) == false)
      return true;
	 
   // Already removed it
   if (List->IsFlag(Pkg,pkgOrderList::Removed) == true)
      return true;
   
   // Woops, it will not be re-installed!
   if (List->IsFlag(Pkg,pkgOrderList::InList) == false)
      return false;

   // Essential packages get special treatment
   bool IsEssential = false;
   if ((Pkg->Flags & pkgCache::Flag::Essential) != 0)
      IsEssential = true;

   /* Check for packages that are the dependents of essential packages and 
      promote them too */
   if (Pkg->CurrentVer != 0)
   {
      for (DepIterator D = Pkg.RevDependsList(); D.end() == false &&
	   IsEssential == false; D++)
	 if (D->Type == pkgCache::Dep::Depends || D->Type == pkgCache::Dep::PreDepends)
	    if ((D.ParentPkg()->Flags & pkgCache::Flag::Essential) != 0)
	       IsEssential = true;
   }

   if (IsEssential == true)
   {
      if (_config->FindB("APT::Force-LoopBreak",false) == false)
	 return _error->Error(_("This installation run will require temporarily "
				"removing the essential package %s due to a "
				"Conflicts/Pre-Depends loop. This is often bad, "
				"but if you really want to do it, activate the "
				"APT::Force-LoopBreak option."),Pkg.Name());
   }
   
   bool Res = SmartRemove(Pkg);
   if (Cache[Pkg].Delete() == false)
      List->Flag(Pkg,pkgOrderList::Removed,pkgOrderList::States);
   
   return Res;
}
									/*}}}*/
// PM::SmartRemove - Removal Helper					/*{{{*/
// ---------------------------------------------------------------------
/* */
bool pkgPackageManager::SmartRemove(PkgIterator Pkg)
{
   if (List->IsNow(Pkg) == false)
      return true;

   List->Flag(Pkg,pkgOrderList::Configured,pkgOrderList::States);

   return Remove(Pkg,(Cache[Pkg].iFlags & pkgDepCache::Purge) == pkgDepCache::Purge);
   return true;
}
									/*}}}*/
// PM::SmartUnPack - Install helper					/*{{{*/
// ---------------------------------------------------------------------
/* This performs the task of handling pre-depends. */
bool pkgPackageManager::SmartUnPack(PkgIterator Pkg)
{
   return SmartUnPack(Pkg, true);
}
bool pkgPackageManager::SmartUnPack(PkgIterator Pkg, bool const Immediate)
{
   // Check if it is already unpacked
   if (Pkg.State() == pkgCache::PkgIterator::NeedsConfigure &&
       Cache[Pkg].Keep() == true)
   {
      List->Flag(Pkg,pkgOrderList::UnPacked,pkgOrderList::States);
      if (Immediate == true &&
	  List->IsFlag(Pkg,pkgOrderList::Immediate) == true)
	 if (SmartConfigure(Pkg) == false)
	    return _error->Error(_("Could not perform immediate configuration on already unpacked '%s'. "
			"Please see man 5 apt.conf under APT::Immediate-Configure for details."),Pkg.Name());
      return true;
   }

   VerIterator const instVer = Cache[Pkg].InstVerIter(Cache);

   /* See if this packages install version has any predependencies
      that are not met by 'now' packages. */
   for (DepIterator D = instVer.DependsList();
	D.end() == false; )
   {
      // Compute a single dependency element (glob or)
      pkgCache::DepIterator Start;
      pkgCache::DepIterator End;
      D.GlobOr(Start,End);
      
      while (End->Type == pkgCache::Dep::PreDepends)
      {
	 if (Debug == true)
	    clog << "PreDepends order for " << Pkg.Name() << std::endl;

	 // Look for possible ok targets.
	 SPtrArray<Version *> VList = Start.AllTargets();
	 bool Bad = true;
	 for (Version **I = VList; *I != 0 && Bad == true; I++)
	 {
	    VerIterator Ver(Cache,*I);
	    PkgIterator Pkg = Ver.ParentPkg();
	    
	    // See if the current version is ok
	    if (Pkg.CurrentVer() == Ver && List->IsNow(Pkg) == true && 
		Pkg.State() == PkgIterator::NeedsNothing)
	    {
	       Bad = false;
	       if (Debug == true)
		  clog << "Found ok package " << Pkg.Name() << endl;
	       continue;
	    }
	 }
	 
	 // Look for something that could be configured.
	 for (Version **I = VList; *I != 0 && Bad == true; I++)
	 {
	    VerIterator Ver(Cache,*I);
	    PkgIterator Pkg = Ver.ParentPkg();
	    
	    // Not the install version 
	    if (Cache[Pkg].InstallVer != *I || 
		(Cache[Pkg].Keep() == true && Pkg.State() == PkgIterator::NeedsNothing))
	       continue;

	    if (Debug == true)
	       clog << "Trying to SmartConfigure " << Pkg.Name() << endl;
	    Bad = !SmartConfigure(Pkg);
	 }

	 /* If this or element did not match then continue on to the
	    next or element until a matching element is found */
	 if (Bad == true)
	 {
	    // This triggers if someone make a pre-depends/depend loop.
	    if (Start == End)
	       return _error->Error("Couldn't configure pre-depend %s for %s, "
				    "probably a dependency cycle.",
				    End.TargetPkg().Name(),Pkg.Name());
	    Start++;
	 }
	 else
	    break;
      }
      
      if (End->Type == pkgCache::Dep::Conflicts || 
	  End->Type == pkgCache::Dep::Obsoletes)
      {
	 /* Look for conflicts. Two packages that are both in the install
	    state cannot conflict so we don't check.. */
	 SPtrArray<Version *> VList = End.AllTargets();
	 for (Version **I = VList; *I != 0; I++)
	 {
	    VerIterator Ver(Cache,*I);
	    PkgIterator Pkg = Ver.ParentPkg();
	    
	    // See if the current version is conflicting
	    if (Pkg.CurrentVer() == Ver && List->IsNow(Pkg) == true)
	    {
	       if (EarlyRemove(Pkg) == false)
		  return _error->Error("Internal Error, Could not early remove %s",Pkg.Name());
	    }
	 }
      }
   }

   // Check for reverse conflicts.
   if (CheckRConflicts(Pkg,Pkg.RevDependsList(),
		   instVer.VerStr()) == false)
      return false;
   
   for (PrvIterator P = instVer.ProvidesList();
	P.end() == false; P++)
      CheckRConflicts(Pkg,P.ParentPkg().RevDependsList(),P.ProvideVersion());

   List->Flag(Pkg,pkgOrderList::UnPacked,pkgOrderList::States);

   if (instVer->MultiArch == pkgCache::Version::Same)
      for (PkgIterator P = Pkg.Group().PackageList();
	   P.end() == false; P = Pkg.Group().NextPkg(P))
      {
	 if (Pkg == P || List->IsFlag(P,pkgOrderList::UnPacked) == true ||
	     Cache[P].InstallVer == 0 || (P.CurrentVer() == Cache[P].InstallVer &&
	      (Cache[Pkg].iFlags & pkgDepCache::ReInstall) != pkgDepCache::ReInstall))
	    continue;
	 SmartUnPack(P, false);
      }

   if(Install(Pkg,FileNames[Pkg->ID]) == false)
      return false;

   // Perform immedate configuration of the package.
   if (Immediate == true &&
       List->IsFlag(Pkg,pkgOrderList::Immediate) == true)
      if (SmartConfigure(Pkg) == false)
	 return _error->Error(_("Could not perform immediate configuration on '%s'. "
			"Please see man 5 apt.conf under APT::Immediate-Configure for details. (%d)"),Pkg.Name(),2);
   
   return true;
}
									/*}}}*/
// PM::OrderInstall - Installation ordering routine			/*{{{*/
// ---------------------------------------------------------------------
/* */
pkgPackageManager::OrderResult pkgPackageManager::OrderInstall()
{
   if (CreateOrderList() == false)
      return Failed;

   Reset();
   
   if (Debug == true)
      clog << "Beginning to order" << endl;

   bool const ordering =
	_config->FindB("PackageManager::UnpackAll",true) ?
		List->OrderUnpack(FileNames) : List->OrderCritical();
   if (ordering == false)
   {
      _error->Error("Internal ordering error");
      return Failed;
   }
   
   if (Debug == true)
      clog << "Done ordering" << endl;

   bool DoneSomething = false;
   for (pkgOrderList::iterator I = List->begin(); I != List->end(); I++)
   {
      PkgIterator Pkg(Cache,*I);

      if (List->IsNow(Pkg) == false)
      {
	 if (Debug == true)
	    clog << "Skipping already done " << Pkg.Name() << endl;
	 continue;
      }
      
      if (List->IsMissing(Pkg) == true)
      {
	 if (Debug == true)
	    clog << "Sequence completed at " << Pkg.Name() << endl;
	 if (DoneSomething == false)
	 {
	    _error->Error("Internal Error, ordering was unable to handle the media swap");
	    return Failed;
	 }	 
	 return Incomplete;
      }
      
      // Sanity check
      if (Cache[Pkg].Keep() == true && 
	  Pkg.State() == pkgCache::PkgIterator::NeedsNothing &&
	  (Cache[Pkg].iFlags & pkgDepCache::ReInstall) != pkgDepCache::ReInstall)
      {
	 _error->Error("Internal Error, trying to manipulate a kept package (%s)",Pkg.Name());
	 return Failed;
      }
      
      // Perform a delete or an install
      if (Cache[Pkg].Delete() == true)
      {
	 if (SmartRemove(Pkg) == false)
	    return Failed;
      }
      else
	 if (SmartUnPack(Pkg) == false)
	    return Failed;
      DoneSomething = true;
   }

   // Final run through the configure phase
   if (ConfigureAll() == false)
      return Failed;

   // Sanity check
   for (pkgOrderList::iterator I = List->begin(); I != List->end(); I++)
   {
      if (List->IsFlag(*I,pkgOrderList::Configured) == false)
      {
	 _error->Error("Internal error, packages left unconfigured. %s",
		       PkgIterator(Cache,*I).Name());
	 return Failed;
      }
   }   
	 
   return Completed;
}
									/*}}}*/
// PM::DoInstallPostFork - Does install part that happens after the fork /*{{{*/
// ---------------------------------------------------------------------
pkgPackageManager::OrderResult 
pkgPackageManager::DoInstallPostFork(int statusFd)
{
      if(statusFd > 0)
         // FIXME: use SetCloseExec here once it taught about throwing
	 //        exceptions instead of doing _exit(100) on failure
	 fcntl(statusFd,F_SETFD,FD_CLOEXEC); 
      bool goResult = Go(statusFd);
      if(goResult == false) 
	 return Failed;

      return Res;
};

// PM::DoInstall - Does the installation				/*{{{*/
// ---------------------------------------------------------------------
/* This uses the filenames in FileNames and the information in the
   DepCache to perform the installation of packages.*/
pkgPackageManager::OrderResult pkgPackageManager::DoInstall(int statusFd)
{
   if(DoInstallPreFork() == Failed)
      return Failed;
   
   return DoInstallPostFork(statusFd);
}
									/*}}}*/