apt/cmdline/apt-cache.cc

// -*- mode: cpp; mode: fold -*-
// Description								/*{{{*/
// $Id: apt-cache.cc,v 1.72 2004/04/30 04:34:03 mdz Exp $
/* ######################################################################
   
   apt-cache - Manages the cache files
   
   apt-cache provides some functions fo manipulating the cache files.
   It uses the command line interface common to all the APT tools. 
   
   Returns 100 on failure, 0 on success.
   
   ##################################################################### */
									/*}}}*/
// Include Files							/*{{{*/
#include <apt-pkg/error.h>
#include <cassert>
#include <apt-pkg/pkgcachegen.h>
#include <apt-pkg/cachefile.h>
#include <apt-pkg/init.h>
#include <apt-pkg/progress.h>
#include <apt-pkg/sourcelist.h>
#include <apt-pkg/cmndline.h>
#include <apt-pkg/strutl.h>
#include <apt-pkg/pkgrecords.h>
#include <apt-pkg/srcrecords.h>
#include <apt-pkg/version.h>
#include <apt-pkg/policy.h>
#include <apt-pkg/tagfile.h>
#include <apt-pkg/algorithms.h>
#include <apt-pkg/sptr.h>

#include "cacheset.h"

#include <config.h>
#include <apti18n.h>

#include <locale.h>
#include <iostream>
#include <unistd.h>
#include <errno.h>
#include <regex.h>
#include <stdio.h>

#include <iomanip>
									/*}}}*/

using namespace std;

// LocalitySort - Sort a version list by package file locality		/*{{{*/
// ---------------------------------------------------------------------
/* */
int LocalityCompare(const void *a, const void *b)
{
   pkgCache::VerFile *A = *(pkgCache::VerFile **)a;
   pkgCache::VerFile *B = *(pkgCache::VerFile **)b;
   
   if (A == 0 && B == 0)
      return 0;
   if (A == 0)
      return 1;
   if (B == 0)
      return -1;
   
   if (A->File == B->File)
      return A->Offset - B->Offset;
   return A->File - B->File;
}

void LocalitySort(pkgCache::VerFile **begin,
		  unsigned long Count,size_t Size)
{   
   qsort(begin,Count,Size,LocalityCompare);
}

void LocalitySort(pkgCache::DescFile **begin,
		  unsigned long Count,size_t Size)
{   
   qsort(begin,Count,Size,LocalityCompare);
}
									/*}}}*/
// UnMet - Show unmet dependencies					/*{{{*/
// ---------------------------------------------------------------------
/* */
bool ShowUnMet(pkgCache::VerIterator const &V, bool const &Important)
{
	 bool Header = false;
	 for (pkgCache::DepIterator D = V.DependsList(); D.end() == false;)
	 {
	    // Collect or groups
	    pkgCache::DepIterator Start;
	    pkgCache::DepIterator End;
	    D.GlobOr(Start,End);

	    // Important deps only
	    if (Important == true)
	       if (End->Type != pkgCache::Dep::PreDepends &&
	           End->Type != pkgCache::Dep::Depends)
		  continue;

	    // Skip conflicts and replaces
	    if (End->Type == pkgCache::Dep::DpkgBreaks ||
		End->Type == pkgCache::Dep::Replaces ||
		End->Type == pkgCache::Dep::Conflicts)
	       continue;

	    // Verify the or group
	    bool OK = false;
	    pkgCache::DepIterator RealStart = Start;
	    do
	    {
	       // See if this dep is Ok
	       pkgCache::Version **VList = Start.AllTargets();
	       if (*VList != 0)
	       {
		  OK = true;
		  delete [] VList;
		  break;
	       }
	       delete [] VList;
	       
	       if (Start == End)
		  break;
	       Start++;
	    }
	    while (1);

	    // The group is OK
	    if (OK == true)
	       continue;
	    
	    // Oops, it failed..
	    if (Header == false)
	       ioprintf(cout,_("Package %s version %s has an unmet dep:\n"),
			V.ParentPkg().FullName(true).c_str(),V.VerStr());
	    Header = true;
	    
	    // Print out the dep type
	    cout << " " << End.DepType() << ": ";

	    // Show the group
	    Start = RealStart;
	    do
	    {
	       cout << Start.TargetPkg().FullName(true);
	       if (Start.TargetVer() != 0)
		  cout << " (" << Start.CompType() << " " << Start.TargetVer() <<
		  ")";
	       if (Start == End)
		  break;
	       cout << " | ";
	       Start++;
	    }
	    while (1);
	    
	    cout << endl;
	 }
   return true;
}
bool UnMet(CommandLine &CmdL)
{
   bool const Important = _config->FindB("APT::Cache::Important",false);

   pkgCacheFile CacheFile;
   if (unlikely(CacheFile.GetPkgCache() == NULL))
      return false;

   if (CmdL.FileSize() <= 1)
   {
      for (pkgCache::PkgIterator P = CacheFile.GetPkgCache()->PkgBegin(); P.end() == false; P++)
	 for (pkgCache::VerIterator V = P.VersionList(); V.end() == false; ++V)
	    if (ShowUnMet(V, Important) == false)
	       return false;
   }
   else
   {
      APT::VersionSet verset = APT::VersionSet::FromCommandLine(CacheFile, CmdL.FileList + 1);
      for (APT::VersionSet::iterator V = verset.begin(); V != verset.end(); ++V)
	 if (ShowUnMet(V, Important) == false)
	    return false;
   }
   return true;
}
									/*}}}*/
// DumpPackage - Show a dump of a package record			/*{{{*/
// ---------------------------------------------------------------------
/* */
bool DumpPackage(CommandLine &CmdL)
{
   pkgCacheFile CacheFile;
   APT::PackageSet pkgset = APT::PackageSet::FromCommandLine(CacheFile, CmdL.FileList + 1);

   for (APT::PackageSet::const_iterator Pkg = pkgset.begin(); Pkg != pkgset.end(); ++Pkg)
   {
      cout << "Package: " << Pkg.FullName(true) << endl;
      cout << "Versions: " << endl;
      for (pkgCache::VerIterator Cur = Pkg.VersionList(); Cur.end() != true; Cur++)
      {
	 cout << Cur.VerStr();
	 for (pkgCache::VerFileIterator Vf = Cur.FileList(); Vf.end() == false; Vf++)
	    cout << " (" << Vf.File().FileName() << ")";
	 cout << endl;
	 for (pkgCache::DescIterator D = Cur.DescriptionList(); D.end() == false; D++)
	 {
	    cout << " Description Language: " << D.LanguageCode() << endl
		 << "                 File: " << D.FileList().File().FileName() << endl
		 << "                  MD5: " << D.md5() << endl;
	 }
	 cout << endl;
      }
      
      cout << endl;
      
      cout << "Reverse Depends: " << endl;
      for (pkgCache::DepIterator D = Pkg.RevDependsList(); D.end() != true; D++)
      {
	 cout << "  " << D.ParentPkg().FullName(true) << ',' << D.TargetPkg().FullName(true);
	 if (D->Version != 0)
	    cout << ' ' << DeNull(D.TargetVer()) << endl;
	 else
	    cout << endl;
      }
      
      cout << "Dependencies: " << endl;
      for (pkgCache::VerIterator Cur = Pkg.VersionList(); Cur.end() != true; Cur++)
      {
	 cout << Cur.VerStr() << " - ";
	 for (pkgCache::DepIterator Dep = Cur.DependsList(); Dep.end() != true; Dep++)
	    cout << Dep.TargetPkg().FullName(true) << " (" << (int)Dep->CompareOp << " " << DeNull(Dep.TargetVer()) << ") ";
	 cout << endl;
      }      

      cout << "Provides: " << endl;
      for (pkgCache::VerIterator Cur = Pkg.VersionList(); Cur.end() != true; Cur++)
      {
	 cout << Cur.VerStr() << " - ";
	 for (pkgCache::PrvIterator Prv = Cur.ProvidesList(); Prv.end() != true; Prv++)
	    cout << Prv.ParentPkg().FullName(true) << " ";
	 cout << endl;
      }
      cout << "Reverse Provides: " << endl;
      for (pkgCache::PrvIterator Prv = Pkg.ProvidesList(); Prv.end() != true; Prv++)
	 cout << Prv.OwnerPkg().FullName(true) << " " << Prv.OwnerVer().VerStr() << endl;
   }

   return true;
}
									/*}}}*/
// Stats - Dump some nice statistics					/*{{{*/
// ---------------------------------------------------------------------
/* */
bool Stats(CommandLine &Cmd)
{
   pkgCacheFile CacheFile;
   pkgCache *Cache = CacheFile.GetPkgCache();
   if (unlikely(Cache == NULL))
      return false;

   cout << _("Total package names: ") << Cache->Head().GroupCount << " (" <<
      SizeToStr(Cache->Head().GroupCount*Cache->Head().GroupSz) << ')' << endl
        << _("Total package structures: ") << Cache->Head().PackageCount << " (" <<
      SizeToStr(Cache->Head().PackageCount*Cache->Head().PackageSz) << ')' << endl;

   int Normal = 0;
   int Virtual = 0;
   int NVirt = 0;
   int DVirt = 0;
   int Missing = 0;
   pkgCache::PkgIterator I = Cache->PkgBegin();
   for (;I.end() != true; I++)
   {
      if (I->VersionList != 0 && I->ProvidesList == 0)
      {
	 Normal++;
	 continue;
      }

      if (I->VersionList != 0 && I->ProvidesList != 0)
      {
	 NVirt++;
	 continue;
      }
      
      if (I->VersionList == 0 && I->ProvidesList != 0)
      {
	 // Only 1 provides
	 if (I.ProvidesList()->NextProvides == 0)
	 {
	    DVirt++;
	 }
	 else
	    Virtual++;
	 continue;
      }
      if (I->VersionList == 0 && I->ProvidesList == 0)
      {
	 Missing++;
	 continue;
      }
   }
   cout << _("  Normal packages: ") << Normal << endl;
   cout << _("  Pure virtual packages: ") << Virtual << endl;
   cout << _("  Single virtual packages: ") << DVirt << endl;
   cout << _("  Mixed virtual packages: ") << NVirt << endl;
   cout << _("  Missing: ") << Missing << endl;
   
   cout << _("Total distinct versions: ") << Cache->Head().VersionCount << " (" <<
      SizeToStr(Cache->Head().VersionCount*Cache->Head().VersionSz) << ')' << endl;
   cout << _("Total distinct descriptions: ") << Cache->Head().DescriptionCount << " (" <<
      SizeToStr(Cache->Head().DescriptionCount*Cache->Head().DescriptionSz) << ')' << endl;
   cout << _("Total dependencies: ") << Cache->Head().DependsCount << " (" << 
      SizeToStr(Cache->Head().DependsCount*Cache->Head().DependencySz) << ')' << endl;
   
   cout << _("Total ver/file relations: ") << Cache->Head().VerFileCount << " (" <<
      SizeToStr(Cache->Head().VerFileCount*Cache->Head().VerFileSz) << ')' << endl;
   cout << _("Total Desc/File relations: ") << Cache->Head().DescFileCount << " (" <<
      SizeToStr(Cache->Head().DescFileCount*Cache->Head().DescFileSz) << ')' << endl;
   cout << _("Total Provides mappings: ") << Cache->Head().ProvidesCount << " (" <<
      SizeToStr(Cache->Head().ProvidesCount*Cache->Head().ProvidesSz) << ')' << endl;
   
   // String list stats
   unsigned long Size = 0;
   unsigned long Count = 0;
   for (pkgCache::StringItem *I = Cache->StringItemP + Cache->Head().StringList;
        I!= Cache->StringItemP; I = Cache->StringItemP + I->NextItem)
   {
      Count++;
      Size += strlen(Cache->StrP + I->String) + 1;
   }
   cout << _("Total globbed strings: ") << Count << " (" << SizeToStr(Size) << ')' << endl;

   unsigned long DepVerSize = 0;
   for (pkgCache::PkgIterator P = Cache->PkgBegin(); P.end() == false; P++)
   {
      for (pkgCache::VerIterator V = P.VersionList(); V.end() == false; V++)
      {
	 for (pkgCache::DepIterator D = V.DependsList(); D.end() == false; D++)
	 {
	    if (D->Version != 0)
	       DepVerSize += strlen(D.TargetVer()) + 1;
	 }
      }
   }
   cout << _("Total dependency version space: ") << SizeToStr(DepVerSize) << endl;
   
   unsigned long Slack = 0;
   for (int I = 0; I != 7; I++)
      Slack += Cache->Head().Pools[I].ItemSize*Cache->Head().Pools[I].Count;
   cout << _("Total slack space: ") << SizeToStr(Slack) << endl;
   
   unsigned long Total = 0;
   Total = Slack + Size + Cache->Head().DependsCount*Cache->Head().DependencySz + 
           Cache->Head().VersionCount*Cache->Head().VersionSz +
           Cache->Head().PackageCount*Cache->Head().PackageSz + 
           Cache->Head().VerFileCount*Cache->Head().VerFileSz +
           Cache->Head().ProvidesCount*Cache->Head().ProvidesSz;
   cout << _("Total space accounted for: ") << SizeToStr(Total) << endl;
   
   return true;
}
									/*}}}*/
// Dump - show everything						/*{{{*/
// ---------------------------------------------------------------------
/* This is worthless except fer debugging things */
bool Dump(CommandLine &Cmd)
{
   pkgCacheFile CacheFile;
   pkgCache *Cache = CacheFile.GetPkgCache();
   if (unlikely(Cache == NULL))
      return false;

   cout << "Using Versioning System: " << Cache->VS->Label << endl;
   
   for (pkgCache::PkgIterator P = Cache->PkgBegin(); P.end() == false; P++)
   {
      cout << "Package: " << P.FullName(true) << endl;
      for (pkgCache::VerIterator V = P.VersionList(); V.end() == false; V++)
      {
	 cout << " Version: " << V.VerStr() << endl;
	 cout << "     File: " << V.FileList().File().FileName() << endl;
	 for (pkgCache::DepIterator D = V.DependsList(); D.end() == false; D++)
	    cout << "  Depends: " << D.TargetPkg().FullName(true) << ' ' << 
	                     DeNull(D.TargetVer()) << endl;
	 for (pkgCache::DescIterator D = V.DescriptionList(); D.end() == false; D++)
	 {
	    cout << " Description Language: " << D.LanguageCode() << endl
		 << "                 File: " << D.FileList().File().FileName() << endl
		 << "                  MD5: " << D.md5() << endl;
	 } 
      }      
   }

   for (pkgCache::PkgFileIterator F = Cache->FileBegin(); F.end() == false; F++)
   {
      cout << "File: " << F.FileName() << endl;
      cout << " Type: " << F.IndexType() << endl;
      cout << " Size: " << F->Size << endl;
      cout << " ID: " << F->ID << endl;
      cout << " Flags: " << F->Flags << endl;
      cout << " Time: " << TimeRFC1123(F->mtime) << endl;
      cout << " Archive: " << DeNull(F.Archive()) << endl;
      cout << " Component: " << DeNull(F.Component()) << endl;
      cout << " Version: " << DeNull(F.Version()) << endl;
      cout << " Origin: " << DeNull(F.Origin()) << endl;
      cout << " Site: " << DeNull(F.Site()) << endl;
      cout << " Label: " << DeNull(F.Label()) << endl;
      cout << " Architecture: " << DeNull(F.Architecture()) << endl;
   }

   return true;
}
									/*}}}*/
// DumpAvail - Print out the available list				/*{{{*/
// ---------------------------------------------------------------------
/* This is needed to make dpkg --merge happy.. I spent a bit of time to 
   make this run really fast, perhaps I went a little overboard.. */
bool DumpAvail(CommandLine &Cmd)
{
   pkgCacheFile CacheFile;
   pkgCache *Cache = CacheFile.GetPkgCache();
   if (unlikely(Cache == NULL || CacheFile.BuildPolicy() == false))
      return false;

   unsigned long Count = Cache->HeaderP->PackageCount+1;
   pkgCache::VerFile **VFList = new pkgCache::VerFile *[Count];
   memset(VFList,0,sizeof(*VFList)*Count);
   
   // Map versions that we want to write out onto the VerList array.
   for (pkgCache::PkgIterator P = Cache->PkgBegin(); P.end() == false; P++)
   {    
      if (P->VersionList == 0)
	 continue;
      
      /* Find the proper version to use. If the policy says there are no
         possible selections we return the installed version, if available..
       	 This prevents dselect from making it obsolete. */
      pkgCache::VerIterator V = CacheFile.GetPolicy()->GetCandidateVer(P);
      if (V.end() == true)
      {
	 if (P->CurrentVer == 0)
	    continue;
	 V = P.CurrentVer();
      }
      
      pkgCache::VerFileIterator VF = V.FileList();
      for (; VF.end() == false ; VF++)
	 if ((VF.File()->Flags & pkgCache::Flag::NotSource) == 0)
	    break;
      
      /* Okay, here we have a bit of a problem.. The policy has selected the
         currently installed package - however it only exists in the
       	 status file.. We need to write out something or dselect will mark
         the package as obsolete! Thus we emit the status file entry, but
         below we remove the status line to make it valid for the 
         available file. However! We only do this if their do exist *any*
         non-source versions of the package - that way the dselect obsolete
         handling works OK. */
      if (VF.end() == true)
      {
	 for (pkgCache::VerIterator Cur = P.VersionList(); Cur.end() != true; Cur++)
	 {
	    for (VF = Cur.FileList(); VF.end() == false; VF++)
	    {	 
	       if ((VF.File()->Flags & pkgCache::Flag::NotSource) == 0)
	       {
		  VF = V.FileList();
		  break;
	       }
	    }
	    
	    if (VF.end() == false)
	       break;
	 }
      }
      
      VFList[P->ID] = VF;
   }
   
   LocalitySort(VFList,Count,sizeof(*VFList));

   // Iterate over all the package files and write them out.
   char *Buffer = new char[Cache->HeaderP->MaxVerFileSize+10];
   for (pkgCache::VerFile **J = VFList; *J != 0;)
   {
      pkgCache::PkgFileIterator File(*Cache,(*J)->File + Cache->PkgFileP);
      if (File.IsOk() == false)
      {
	 _error->Error(_("Package file %s is out of sync."),File.FileName());
	 break;
      }

      FileFd PkgF(File.FileName(),FileFd::ReadOnly);
      if (_error->PendingError() == true)
	 break;
      
      /* Write all of the records from this package file, since we
       	 already did locality sorting we can now just seek through the
       	 file in read order. We apply 1 more optimization here, since often
       	 there will be < 1 byte gaps between records (for the \n) we read that
       	 into the next buffer and offset a bit.. */
      unsigned long Pos = 0;
      for (; *J != 0; J++)
      {
	 if ((*J)->File + Cache->PkgFileP != File)
	    break;
	 
	 const pkgCache::VerFile &VF = **J;

	 // Read the record and then write it out again.
	 unsigned long Jitter = VF.Offset - Pos;
	 if (Jitter > 8)
	 {
	    if (PkgF.Seek(VF.Offset) == false)
	       break;
	    Jitter = 0;
	 }
	 
	 if (PkgF.Read(Buffer,VF.Size + Jitter) == false)
	    break;
	 Buffer[VF.Size + Jitter] = '\n';
	 
	 // See above..
	 if ((File->Flags & pkgCache::Flag::NotSource) == pkgCache::Flag::NotSource)
	 {
	    pkgTagSection Tags;
	    TFRewriteData RW[] = {{"Status",0},{"Config-Version",0},{}};
	    const char *Zero = 0;
	    if (Tags.Scan(Buffer+Jitter,VF.Size+1) == false ||
		TFRewrite(stdout,Tags,&Zero,RW) == false)
	    {
	       _error->Error("Internal Error, Unable to parse a package record");
	       break;
	    }
	    fputc('\n',stdout);
	 }
	 else
	 {
	    if (fwrite(Buffer+Jitter,VF.Size+1,1,stdout) != 1)
	       break;
	 }
	 
	 Pos = VF.Offset + VF.Size;
      }

      fflush(stdout);
      if (_error->PendingError() == true)
         break;
   }
   
   delete [] Buffer;
   delete [] VFList;
   return !_error->PendingError();
}
									/*}}}*/
// Depends - Print out a dependency tree				/*{{{*/
// ---------------------------------------------------------------------
/* */
bool Depends(CommandLine &CmdL)
{
   pkgCacheFile CacheFile;
   pkgCache *Cache = CacheFile.GetPkgCache();
   if (unlikely(Cache == NULL))
      return false;

   SPtrArray<unsigned> Colours = new unsigned[Cache->Head().PackageCount];
   memset(Colours,0,sizeof(*Colours)*Cache->Head().PackageCount);

   APT::PackageSet pkgset = APT::PackageSet::FromCommandLine(CacheFile, CmdL.FileList + 1);
   for (APT::PackageSet::const_iterator Pkg = pkgset.begin(); Pkg != pkgset.end(); ++Pkg)
      Colours[Pkg->ID] = 1;

   bool Recurse = _config->FindB("APT::Cache::RecurseDepends",false);
   bool Installed = _config->FindB("APT::Cache::Installed",false);
   bool Important = _config->FindB("APT::Cache::Important",false);
   bool DidSomething;
   do
   {
      DidSomething = false;
      for (pkgCache::PkgIterator Pkg = Cache->PkgBegin(); Pkg.end() == false; Pkg++)
      {
	 if (Colours[Pkg->ID] != 1)
	    continue;
	 Colours[Pkg->ID] = 2;
	 DidSomething = true;
	 
	 pkgCache::VerIterator Ver = Pkg.VersionList();
	 if (Ver.end() == true)
	 {
	    cout << '<' << Pkg.FullName(true) << '>' << endl;
	    continue;
	 }
	 
	 cout << Pkg.FullName(true) << endl;
	 
	 for (pkgCache::DepIterator D = Ver.DependsList(); D.end() == false; D++)
	 {
	    // Important deps only
	    if (Important == true)
	       if (D->Type != pkgCache::Dep::PreDepends &&
		   D->Type != pkgCache::Dep::Depends)
		  continue;
		  
	    pkgCache::PkgIterator Trg = D.TargetPkg();

	    if((Installed && Trg->CurrentVer != 0) || !Installed)
	      {

		if ((D->CompareOp & pkgCache::Dep::Or) == pkgCache::Dep::Or)
		  cout << " |";
		else
		  cout << "  ";
	    
		// Show the package
		if (Trg->VersionList == 0)
		  cout << D.DepType() << ": <" << Trg.FullName(true) << ">" << endl;
		else
		  cout << D.DepType() << ": " << Trg.FullName(true) << endl;
	    
		if (Recurse == true)
		  Colours[D.TargetPkg()->ID]++;

	      }
	    
	    // Display all solutions
	    SPtrArray<pkgCache::Version *> List = D.AllTargets();
	    pkgPrioSortList(*Cache,List);
	    for (pkgCache::Version **I = List; *I != 0; I++)
	    {
	       pkgCache::VerIterator V(*Cache,*I);
	       if (V != Cache->VerP + V.ParentPkg()->VersionList ||
		   V->ParentPkg == D->Package)
		  continue;
	       cout << "    " << V.ParentPkg().FullName(true) << endl;
	       
	       if (Recurse == true)
		  Colours[D.ParentPkg()->ID]++;
	    }
	 }
      }      
   }   
   while (DidSomething == true);
   
   return true;
}
									/*}}}*/
// RDepends - Print out a reverse dependency tree - mbc			/*{{{*/
// ---------------------------------------------------------------------
/* */
bool RDepends(CommandLine &CmdL)
{
   pkgCacheFile CacheFile;
   pkgCache *Cache = CacheFile.GetPkgCache();
   if (unlikely(Cache == NULL))
      return false;

   SPtrArray<unsigned> Colours = new unsigned[Cache->Head().PackageCount];
   memset(Colours,0,sizeof(*Colours)*Cache->Head().PackageCount);

   APT::PackageSet pkgset = APT::PackageSet::FromCommandLine(CacheFile, CmdL.FileList + 1);
   for (APT::PackageSet::const_iterator Pkg = pkgset.begin(); Pkg != pkgset.end(); ++Pkg)
      Colours[Pkg->ID] = 1;

   bool Recurse = _config->FindB("APT::Cache::RecurseDepends",false);
   bool Installed = _config->FindB("APT::Cache::Installed",false);
   bool DidSomething;
   do
   {
      DidSomething = false;
      for (pkgCache::PkgIterator Pkg = Cache->PkgBegin(); Pkg.end() == false; Pkg++)
      {
	 if (Colours[Pkg->ID] != 1)
	    continue;
	 Colours[Pkg->ID] = 2;
	 DidSomething = true;
	 
	 pkgCache::VerIterator Ver = Pkg.VersionList();
	 if (Ver.end() == true)
	 {
	    cout << '<' << Pkg.FullName(true) << '>' << endl;
	    continue;
	 }
	 
	 cout << Pkg.FullName(true) << endl;
	 
	 cout << "Reverse Depends:" << endl;
	 for (pkgCache::DepIterator D = Pkg.RevDependsList(); D.end() == false; D++)
	 {	    
	    // Show the package
	    pkgCache