adapt to the new CacheSetHelper API

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

diff --git a/apt-pkg/packagemanager.cc b/apt-pkg/packagemanager.cc
index 5f9a31264884208c33a31c526092bb54a469c6d3..e4cd1dc3b8ff318a1befbf28a6cf09732fd762c5 100644 (file)
--- a/apt-pkg/packagemanager.cc
+++ b/apt-pkg/packagemanager.cc
@@ -13,7 +13,7 @@
    ##################################################################### */
                                                                        /*}}}*/
 // Include Files                                                       /*{{{*/
    ##################################################################### */
                                                                        /*}}}*/
 // Include Files                                                       /*{{{*/

-#include<config.h>
+#include <config.h>

 
 #include <apt-pkg/packagemanager.h>
 #include <apt-pkg/orderlist.h>
 
 #include <apt-pkg/packagemanager.h>
 #include <apt-pkg/orderlist.h>


@@ -24,7 +24,15 @@
 #include <apt-pkg/algorithms.h>
 #include <apt-pkg/configuration.h>
 #include <apt-pkg/sptr.h>
 #include <apt-pkg/algorithms.h>
 #include <apt-pkg/configuration.h>
 #include <apt-pkg/sptr.h>

-
+#include <apt-pkg/macros.h>
+#include <apt-pkg/pkgcache.h>
+#include <apt-pkg/cacheiterators.h>
+#include <apt-pkg/strutl.h>
+#include <apt-pkg/install-progress.h>
+
+#include <stddef.h>
+#include <list>
+#include <string>

 #include <iostream>
 
 #include <apti18n.h>
 #include <iostream>
 
 #include <apti18n.h>


@@ -254,7 +262,7 @@ bool pkgPackageManager::CheckRConflicts(PkgIterator Pkg,DepIterator D,
       if (Cache.VS().CheckDep(Ver,D->CompareOp,D.TargetVer()) == false)
         continue;
 
       if (Cache.VS().CheckDep(Ver,D->CompareOp,D.TargetVer()) == false)
         continue;
 

-      if (EarlyRemove(D.ParentPkg()) == false)
+      if (EarlyRemove(D.ParentPkg(), &D) == false)

         return _error->Error("Reverse conflicts early remove for package '%s' failed",
                              Pkg.FullName().c_str());
    }
         return _error->Error("Reverse conflicts early remove for package '%s' failed",
                              Pkg.FullName().c_str());
    }


@@ -306,18 +314,41 @@ bool pkgPackageManager::ConfigureAll()
    return true;
 }
                                                                        /*}}}*/
    return true;
 }
                                                                        /*}}}*/

+// PM::NonLoopingSmart - helper to avoid loops while calling Smart methods /*{{{*/
+// -----------------------------------------------------------------------
+/* ensures that a loop of the form A depends B, B depends A (and similar)
+   is not leading us down into infinite recursion segfault land */
+bool pkgPackageManager::NonLoopingSmart(SmartAction const action, pkgCache::PkgIterator &Pkg,
+      pkgCache::PkgIterator DepPkg, int const Depth, bool const PkgLoop,
+      bool * const Bad, bool * const Changed)
+{
+   if (PkgLoop == false)
+      List->Flag(Pkg,pkgOrderList::Loop);
+   bool success = false;
+   switch(action)
+   {
+      case UNPACK_IMMEDIATE: success = SmartUnPack(DepPkg, true, Depth + 1); break;
+      case UNPACK: success = SmartUnPack(DepPkg, false, Depth + 1); break;
+      case CONFIGURE: success = SmartConfigure(DepPkg, Depth + 1); break;
+   }
+   if (PkgLoop == false)
+      List->RmFlag(Pkg,pkgOrderList::Loop);
+
+   if (success == false)
+      return false;
+
+   if (Bad != NULL)
+      *Bad = false;
+   if (Changed != NULL && List->IsFlag(DepPkg,pkgOrderList::Loop) == false)
+      *Changed = true;
+   return true;
+}
+                                                                       /*}}}*/

 // PM::SmartConfigure - Perform immediate configuration of the pkg     /*{{{*/
 // ---------------------------------------------------------------------
 /* This function tries to put the system in a state where Pkg can be configured.
 // PM::SmartConfigure - Perform immediate configuration of the pkg     /*{{{*/
 // ---------------------------------------------------------------------
 /* This function tries to put the system in a state where Pkg can be configured.

-   This involves checking each of Pkg's dependanies and unpacking and 
-   configuring packages where needed. 
-   
-   Note on failure: This method can fail, without causing any problems. 
-   This can happen when using Immediate-Configure-All, SmartUnPack may call
-   SmartConfigure, it may fail because of a complex dependency situation, but
-   a error will only be reported if ConfigureAll fails. This is why some of the
-   messages this function reports on failure (return false;) as just warnings
-   only shown when debuging*/
+   This involves checking each of Pkg's dependencies and unpacking and
+   configuring packages where needed. */

 bool pkgPackageManager::SmartConfigure(PkgIterator Pkg, int const Depth)
 {
    // If this is true, only check and correct and dependencies without the Loop flag
 bool pkgPackageManager::SmartConfigure(PkgIterator Pkg, int const Depth)
 {
    // If this is true, only check and correct and dependencies without the Loop flag


@@ -332,9 +363,9 @@ bool pkgPackageManager::SmartConfigure(PkgIterator Pkg, int const Depth)
    }
 
    VerIterator const instVer = Cache[Pkg].InstVerIter(Cache);
    }
 
    VerIterator const instVer = Cache[Pkg].InstVerIter(Cache);

-      
-   /* Because of the ordered list, most dependencies should be unpacked, 
-      however if there is a loop (A depends on B, B depends on A) this will not 
+
+   /* Because of the ordered list, most dependencies should be unpacked,
+      however if there is a loop (A depends on B, B depends on A) this will not

       be the case, so check for dependencies before configuring. */
    bool Bad = false, Changed = false;
    const unsigned int max_loops = _config->FindI("APT::pkgPackageManager::MaxLoopCount", 5000);
       be the case, so check for dependencies before configuring. */
    bool Bad = false, Changed = false;
    const unsigned int max_loops = _config->FindI("APT::pkgPackageManager::MaxLoopCount", 5000);


@@ -342,6 +373,8 @@ bool pkgPackageManager::SmartConfigure(PkgIterator Pkg, int const Depth)
    std::list<DepIterator> needConfigure;
    do
    {
    std::list<DepIterator> needConfigure;
    do
    {

+      // Check each dependency and see if anything needs to be done
+      // so that it can be configured

       Changed = false;
       for (DepIterator D = instVer.DependsList(); D.end() == false; )
       {
       Changed = false;
       for (DepIterator D = instVer.DependsList(); D.end() == false; )
       {


@@ -353,7 +386,8 @@ bool pkgPackageManager::SmartConfigure(PkgIterator Pkg, int const Depth)
            continue;
         Bad = true;
 
            continue;
         Bad = true;
 

-        // Check for dependencies that have not been unpacked, probably due to loops.
+         // the first pass checks if we its all good, i.e. if we have
+         // to do anything at all

         for (DepIterator Cur = Start; true; ++Cur)
         {
            SPtrArray<Version *> VList = Cur.AllTargets();
         for (DepIterator Cur = Start; true; ++Cur)
         {
            SPtrArray<Version *> VList = Cur.AllTargets();


@@ -381,25 +415,58 @@ bool pkgPackageManager::SmartConfigure(PkgIterator Pkg, int const Depth)
                  if (Debug)
                     std::clog << OutputInDepth(Depth) << "Package " << Pkg << " loops in SmartConfigure" << std::endl;
                  Bad = false;
                  if (Debug)
                     std::clog << OutputInDepth(Depth) << "Package " << Pkg << " loops in SmartConfigure" << std::endl;
                  Bad = false;

-                 break;
+              }
+           }
+
+            if (Cur == End || Bad == false)
+              break;
+         }
+
+         // this dependency is in a good state, so we can stop
+         if (Bad == false)
+         {
+            if (Debug)
+               std::clog << OutputInDepth(Depth) << "Found ok dep " << D.TargetPkg() << std::endl;
+            continue;
+         }
+
+        // Check for dependencies that have not been unpacked, 
+         // probably due to loops.
+        for (DepIterator Cur = Start; true; ++Cur)
+        {
+           SPtrArray<Version *> VList = Cur.AllTargets();
+
+           for (Version **I = VList; *I != 0; ++I)
+           {
+              VerIterator Ver(Cache,*I);
+              PkgIterator DepPkg = Ver.ParentPkg();
+
+              // Check if the current version of the package is available and will satisfy this dependency
+              if (DepPkg.CurrentVer() == Ver && List->IsNow(DepPkg) == true &&
+                  List->IsFlag(DepPkg,pkgOrderList::Removed) == false &&
+                  DepPkg.State() == PkgIterator::NeedsNothing)
+                  continue;
+
+              // Check if the version that is going to be installed will satisfy the dependency
+              if (Cache[DepPkg].InstallVer != *I || List->IsNow(DepPkg) == false)
+                 continue;
+
+              if (PkgLoop == true)
+              {
+                 if (Debug)
+                    std::clog << OutputInDepth(Depth) << "Package " << Pkg << " loops in SmartConfigure" << std::endl;
+                 Bad = false;

               }
               else
               {
                  if (Debug)
                     clog << OutputInDepth(Depth) << "Unpacking " << DepPkg.FullName() << " to avoid loop " << Cur << endl;
               }
               else
               {
                  if (Debug)
                     clog << OutputInDepth(Depth) << "Unpacking " << DepPkg.FullName() << " to avoid loop " << Cur << endl;

-                 if (PkgLoop == false)
-                    List->Flag(Pkg,pkgOrderList::Loop);
-                 if (SmartUnPack(DepPkg, true, Depth + 1) == true)
-                 {
-                    Bad = false;
-                    if (List->IsFlag(DepPkg,pkgOrderList::Loop) == false)
-                       Changed = true;
-                 }
-                 if (PkgLoop == false)
-                    List->RmFlag(Pkg,pkgOrderList::Loop);
-                 if (Bad == false)
-                    break;
+                 if (NonLoopingSmart(UNPACK_IMMEDIATE, Pkg, DepPkg, Depth, PkgLoop, &Bad, &Changed) == false)
+                    return false;

               }
               }

+               // at this point we either unpacked a Dep or we are in a loop,
+               // no need to unpack a second one
+              break;

            }
 
            if (Cur == End || Bad == false)
            }
 
            if (Cur == End || Bad == false)


@@ -415,6 +482,7 @@ bool pkgPackageManager::SmartConfigure(PkgIterator Pkg, int const Depth)
          return _error->Error("Internal error: MaxLoopCount reached in SmartUnPack (1) for %s, aborting", Pkg.FullName().c_str());
    } while (Changed == true);
 
          return _error->Error("Internal error: MaxLoopCount reached in SmartUnPack (1) for %s, aborting", Pkg.FullName().c_str());
    } while (Changed == true);
 

+   // now go over anything that needs configuring

    Bad = false, Changed = false, i = 0;
    do
    {
    Bad = false, Changed = false, i = 0;
    do
    {


@@ -454,25 +522,12 @@ bool pkgPackageManager::SmartConfigure(PkgIterator Pkg, int const Depth)
                    Bad = false;
                    break;
                  }
                    Bad = false;
                    break;
                  }

-                 /* Check for a loop to prevent one forming
-                      If A depends on B and B depends on A, SmartConfigure will
-                      just hop between them if this is not checked. Dont remove the
-                      loop flag after finishing however as loop is already set.
-                      This means that there is another SmartConfigure call for this
-                      package and it will remove the loop flag */
-                 if (PkgLoop == false)
-                    List->Flag(Pkg,pkgOrderList::Loop);
-                 if (SmartConfigure(DepPkg, Depth + 1) == true)
-                 {
-                    Bad = false;
-                    if (List->IsFlag(DepPkg,pkgOrderList::Loop) == false)
-                       Changed = true;
-                 }
-                 if (PkgLoop == false)
-                   List->RmFlag(Pkg,pkgOrderList::Loop);
-                 // If SmartConfigure was succesfull, Bad is false, so break
-                 if (Bad == false)
-                    break;
+                 if (Debug)
+                    std::clog << OutputInDepth(Depth) << "Configure already unpacked " << DepPkg << std::endl;
+                 if (NonLoopingSmart(CONFIGURE, Pkg, DepPkg, Depth, PkgLoop, &Bad, &Changed) == false)
+                    return false;
+                 break;
+

               }
               else if (List->IsFlag(DepPkg,pkgOrderList::Configured))
               {
               }
               else if (List->IsFlag(DepPkg,pkgOrderList::Configured))
               {


@@ -491,19 +546,16 @@ bool pkgPackageManager::SmartConfigure(PkgIterator Pkg, int const Depth)
       if (i++ > max_loops)
          return _error->Error("Internal error: MaxLoopCount reached in SmartUnPack (2) for %s, aborting", Pkg.FullName().c_str());
    } while (Changed == true);
       if (i++ > max_loops)
          return _error->Error("Internal error: MaxLoopCount reached in SmartUnPack (2) for %s, aborting", Pkg.FullName().c_str());
    } while (Changed == true);

-   
-   if (Bad) {
-      if (Debug)
-         _error->Warning(_("Could not configure '%s'. "),Pkg.FullName().c_str());
-      return false;
-   }
-   
+
+   if (Bad == true)
+      return _error->Error(_("Could not configure '%s'. "),Pkg.FullName().c_str());
+

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

-   if (List->IsFlag(Pkg,pkgOrderList::Configured)) 
+   if (List->IsFlag(Pkg,pkgOrderList::Configured))

       return _error->Error("Internal configure error on '%s'.", Pkg.FullName().c_str());
 
    if (ConfigurePkgs == true && Configure(Pkg) == false)
       return _error->Error("Internal configure error on '%s'.", Pkg.FullName().c_str());
 
    if (ConfigurePkgs == true && Configure(Pkg) == false)


@@ -520,7 +572,8 @@ bool pkgPackageManager::SmartConfigure(PkgIterator Pkg, int const Depth)
             Cache[P].InstallVer == 0 || (P.CurrentVer() == Cache[P].InstallVer &&
              (Cache[Pkg].iFlags & pkgDepCache::ReInstall) != pkgDepCache::ReInstall))
            continue;
             Cache[P].InstallVer == 0 || (P.CurrentVer() == Cache[P].InstallVer &&
              (Cache[Pkg].iFlags & pkgDepCache::ReInstall) != pkgDepCache::ReInstall))
            continue;

-        SmartConfigure(P, (Depth +1));
+        if (SmartConfigure(P, (Depth +1)) == false)
+           return false;

       }
 
    // Sanity Check
       }
 
    // Sanity Check


@@ -534,29 +587,37 @@ bool pkgPackageManager::SmartConfigure(PkgIterator Pkg, int const Depth)
 // ---------------------------------------------------------------------
 /* This is called to deal with conflicts arising from unpacking */
 bool pkgPackageManager::EarlyRemove(PkgIterator Pkg)
 // ---------------------------------------------------------------------
 /* This is called to deal with conflicts arising from unpacking */
 bool pkgPackageManager::EarlyRemove(PkgIterator Pkg)

+{
+   return EarlyRemove(Pkg, NULL);
+}
+bool pkgPackageManager::EarlyRemove(PkgIterator Pkg, DepIterator const * const Dep)

 {
    if (List->IsNow(Pkg) == false)
       return true;
 {
    if (List->IsNow(Pkg) == false)
       return true;

-        
+

    // Already removed it
    if (List->IsFlag(Pkg,pkgOrderList::Removed) == true)
       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;
 
    // Woops, it will not be re-installed!
    if (List->IsFlag(Pkg,pkgOrderList::InList) == false)
       return false;
 

+   // these breaks on M-A:same packages can be dealt with. They 'loop' by design
+   if (Dep != NULL && (*Dep)->Type == pkgCache::Dep::DpkgBreaks && Dep->IsMultiArchImplicit() == true)
+      return true;
+

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

-   /* Check for packages that are the dependents of essential packages and 
+   /* Check for packages that are the dependents of essential packages and

       promote them too */
    if (Pkg->CurrentVer != 0)
    {
       promote them too */
    if (Pkg->CurrentVer != 0)
    {

-      for (DepIterator D = Pkg.RevDependsList(); D.end() == false &&
+      for (pkgCache::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 == false; ++D)
         if (D->Type == pkgCache::Dep::Depends || D->Type == pkgCache::Dep::PreDepends)
            if ((D.ParentPkg()->Flags & pkgCache::Flag::Essential) != 0 ||


@@ -573,11 +634,14 @@ bool pkgPackageManager::EarlyRemove(PkgIterator Pkg)
                                "but if you really want to do it, activate the "
                                "APT::Force-LoopBreak option."),Pkg.FullName().c_str());
    }
                                "but if you really want to do it, activate the "
                                "APT::Force-LoopBreak option."),Pkg.FullName().c_str());
    }

-   
+   // dpkg will auto-deconfigure it, no need for the big remove hammer
+   else if (Dep != NULL && (*Dep)->Type == pkgCache::Dep::DpkgBreaks)
+      return true;
+

    bool Res = SmartRemove(Pkg);
    if (Cache[Pkg].Delete() == false)
       List->Flag(Pkg,pkgOrderList::Removed,pkgOrderList::States);
    bool Res = SmartRemove(Pkg);
    if (Cache[Pkg].Delete() == false)
       List->Flag(Pkg,pkgOrderList::Removed,pkgOrderList::States);

-   
+

    return Res;
 }
                                                                        /*}}}*/
    return Res;
 }
                                                                        /*}}}*/


@@ -615,18 +679,21 @@ bool pkgPackageManager::SmartUnPack(PkgIterator Pkg, bool const Immediate, int c
         clog << " (replace version " << Pkg.CurrentVer().VerStr() << " with " << InstallVer.VerStr() << ")";
       if (PkgLoop)
         clog << " (Only Perform PreUnpack Checks)";
         clog << " (replace version " << Pkg.CurrentVer().VerStr() << " with " << InstallVer.VerStr() << ")";
       if (PkgLoop)
         clog << " (Only Perform PreUnpack Checks)";

+      if (Immediate)
+        clog << " immediately";

       clog << endl;
    }
 
    VerIterator const instVer = Cache[Pkg].InstVerIter(Cache);
 
       clog << endl;
    }
 
    VerIterator const instVer = Cache[Pkg].InstVerIter(Cache);
 

-   /* PreUnpack Checks: This loop checks and attempts to rectify and problems that would prevent the package being unpacked.
+   /* PreUnpack Checks: This loop checks and attempts to rectify any problems that would prevent the package being unpacked.

       It addresses: PreDepends, Conflicts, Obsoletes and Breaks (DpkgBreaks). Any resolutions that do not require it should
       avoid configuration (calling SmartUnpack with Immediate=true), this is because when unpacking some packages with
       It addresses: PreDepends, Conflicts, Obsoletes and Breaks (DpkgBreaks). Any resolutions that do not require it should
       avoid configuration (calling SmartUnpack with Immediate=true), this is because when unpacking some packages with

-      complex dependency structures, trying to configure some packages while breaking the loops can complicate things .
+      complex dependency structures, trying to configure some packages while breaking the loops can complicate things.

       This will be either dealt with if the package is configured as a dependency of Pkg (if and when Pkg is configured),
       or by the ConfigureAll call at the end of the for loop in OrderInstall. */
       This will be either dealt with if the package is configured as a dependency of Pkg (if and when Pkg is configured),
       or by the ConfigureAll call at the end of the for loop in OrderInstall. */

-   bool Changed = false;
+   bool SomethingBad = false, Changed = false;
+   bool couldBeTemporaryRemoved = Depth != 0 && List->IsFlag(Pkg,pkgOrderList::Removed) == false;

    const unsigned int max_loops = _config->FindI("APT::pkgPackageManager::MaxLoopCount", 5000);
    unsigned int i = 0;
    do 
    const unsigned int max_loops = _config->FindI("APT::pkgPackageManager::MaxLoopCount", 5000);
    unsigned int i = 0;
    do 


@@ -674,183 +741,142 @@ bool pkgPackageManager::SmartUnPack(PkgIterator Pkg, bool const Immediate, int c
               for (Version **I = VList; *I != 0; ++I)
               {
                  VerIterator Ver(Cache,*I);
               for (Version **I = VList; *I != 0; ++I)
               {
                  VerIterator Ver(Cache,*I);

-                 PkgIterator Pkg = Ver.ParentPkg();
+                 PkgIterator DepPkg = Ver.ParentPkg();

 
                  // Not the install version
 
                  // Not the install version

-                 if (Cache[Pkg].InstallVer != *I ||
-                     (Cache[Pkg].Keep() == true && Pkg.State() == PkgIterator::NeedsNothing))
+                 if (Cache[DepPkg].InstallVer != *I ||
+                     (Cache[DepPkg].Keep() == true && DepPkg.State() == PkgIterator::NeedsNothing))

                     continue;
 
                     continue;
 

-                 if (List->IsFlag(Pkg,pkgOrderList::Configured))
+                 if (List->IsFlag(DepPkg,pkgOrderList::Configured))

                  {
                     Bad = false;
                     break;
                  }
 
                  // check if it needs unpack or if if configure is enough
                  {
                     Bad = false;
                     break;
                  }
 
                  // check if it needs unpack or if if configure is enough

-                 if (List->IsFlag(Pkg,pkgOrderList::UnPacked) == false)
+                 if (List->IsFlag(DepPkg,pkgOrderList::UnPacked) == false)

                  {
                     if (Debug)
                  {
                     if (Debug)

-                       clog << OutputInDepth(Depth) << "Trying to SmartUnpack " << Pkg.FullName() << endl;
-                    // SmartUnpack with the ImmediateFlag to ensure its really ready
-                    if (SmartUnPack(Pkg, true, Depth + 1) == true)
-                    {
-                       Bad = false;
-                       if (List->IsFlag(Pkg,pkgOrderList::Loop) == false)
-                          Changed = true;
-                       break;
-                    }
+                       clog << OutputInDepth(Depth) << "Trying to SmartUnpack " << DepPkg.FullName() << endl;
+                    if (NonLoopingSmart(UNPACK_IMMEDIATE, Pkg, DepPkg, Depth, PkgLoop, &Bad, &Changed) == false)
+                       return false;

                  }
                  else
                  {
                     if (Debug)
                  }
                  else
                  {
                     if (Debug)

-                       clog << OutputInDepth(Depth) << "Trying to SmartConfigure " << Pkg.FullName() << endl;
-                    if (SmartConfigure(Pkg, Depth + 1) == true)
-                    {
-                       Bad = false;
-                       if (List->IsFlag(Pkg,pkgOrderList::Loop) == false)
-                          Changed = true;
-                       break;
-                    }
+                       clog << OutputInDepth(Depth) << "Trying to SmartConfigure " << DepPkg.FullName() << endl;
+                    if (NonLoopingSmart(CONFIGURE, Pkg, DepPkg, Depth, PkgLoop, &Bad, &Changed) == false)
+                       return false;

                  }
                  }

+                 break;

               }
            }
 
            if (Bad == true)
               }
            }
 
            if (Bad == true)

-           {
-              if (Start == End)
-                 return _error->Error("Couldn't configure pre-depend %s for %s, "
-                                       "probably a dependency cycle.",
-                                       End.TargetPkg().FullName().c_str(),Pkg.FullName().c_str());
-           }
-           else
-              continue;
+              SomethingBad = true;

         }
         else if (End->Type == pkgCache::Dep::Conflicts ||
         }
         else if (End->Type == pkgCache::Dep::Conflicts ||

-                 End->Type == pkgCache::Dep::Obsoletes)
+                 End->Type == pkgCache::Dep::Obsoletes ||
+                 End->Type == pkgCache::Dep::DpkgBreaks)

         {
         {

-           /* Look for conflicts. Two packages that are both in the install
-              state cannot conflict so we don't check.. */

            SPtrArray<Version *> VList = End.AllTargets();
            SPtrArray<Version *> VList = End.AllTargets();

-           for (Version **I = VList; *I != 0; I++)
+           for (Version **I = VList; *I != 0; ++I)

            {
               VerIterator Ver(Cache,*I);
               PkgIterator ConflictPkg = Ver.ParentPkg();
            {
               VerIterator Ver(Cache,*I);
               PkgIterator ConflictPkg = Ver.ParentPkg();

-              VerIterator InstallVer(Cache,Cache[ConflictPkg].InstallVer);
+              if (ConflictPkg.CurrentVer() != Ver)
+              {
+                 if (Debug)
+                    std::clog << OutputInDepth(Depth) << "Ignore not-installed version " << Ver.VerStr() << " of " << ConflictPkg.FullName() << " for " << End << std::endl;
+                 continue;
+              }

 
 

-              // See if the current version is conflicting
-              if (ConflictPkg.CurrentVer() == Ver && List->IsNow(ConflictPkg))
+              if (List->IsNow(ConflictPkg) == false)

               {
               {

-                 clog << OutputInDepth(Depth) << Pkg.FullName() << " conflicts with " << ConflictPkg.FullName() << endl;
-                 /* If a loop is not present or has not yet been detected, attempt to unpack packages
-                    to resolve this conflict. If there is a loop present, remove packages to resolve this conflict */
-                 if (List->IsFlag(ConflictPkg,pkgOrderList::Loop) == false)
-                 {
-                    if (Cache[ConflictPkg].Keep() == 0 && Cache[ConflictPkg].InstallVer != 0)
-                    {
-                       if (Debug)
-                          clog << OutputInDepth(Depth) << OutputInDepth(Depth) << "Unpacking " << ConflictPkg.FullName() << " to prevent conflict" << endl;
-                       List->Flag(Pkg,pkgOrderList::Loop);
-                       if (SmartUnPack(ConflictPkg,false, Depth + 1) == true)
-                          if (List->IsFlag(ConflictPkg,pkgOrderList::Loop) == false)
-                             Changed = true;
-                       // Remove loop to allow it to be used later if needed
-                       List->RmFlag(Pkg,pkgOrderList::Loop);
-                    }
-                    else if (EarlyRemove(ConflictPkg) == false)
-                       return _error->Error("Internal Error, Could not early remove %s (1)",ConflictPkg.FullName().c_str());
-                 }
-                 else if (List->IsFlag(ConflictPkg,pkgOrderList::Removed) == false)
+                 if (Debug)
+                    std::clog << OutputInDepth(Depth) << "Ignore already dealt-with version " << Ver.VerStr() << " of " << ConflictPkg.FullName() << " for " << End << std::endl;
+                 continue;
+              }
+
+              if (List->IsFlag(ConflictPkg,pkgOrderList::Removed) == true)
+              {
+                 if (Debug)
+                    clog << OutputInDepth(Depth) << "Ignoring " << End << " as " << ConflictPkg.FullName() << "was temporarily removed" << endl;
+                 continue;
+              }
+
+              if (List->IsFlag(ConflictPkg,pkgOrderList::Loop) && PkgLoop)
+              {
+                 if (End->Type == pkgCache::Dep::DpkgBreaks && End.IsMultiArchImplicit() == true)

                  {
                     if (Debug)
                  {
                     if (Debug)

-                       clog << OutputInDepth(Depth) << "Because of conficts knot, removing " << ConflictPkg.FullName() << " to conflict violation" << endl;
-                    if (EarlyRemove(ConflictPkg) == false)
-                       return _error->Error("Internal Error, Could not early remove %s (2)",ConflictPkg.FullName().c_str());
+                       clog << OutputInDepth(Depth) << "Because dependency is MultiArchImplicit we ignored looping on: " << ConflictPkg << endl;
+                    continue;

                  }
                  }

-              }
-           }
-        }
-        else if (End->Type == pkgCache::Dep::DpkgBreaks)
-        {
-           SPtrArray<Version *> VList = End.AllTargets();
-           for (Version **I = VList; *I != 0; ++I)
-           {
-              VerIterator Ver(Cache,*I);
-              PkgIterator BrokenPkg = Ver.ParentPkg();
-              if (BrokenPkg.CurrentVer() != Ver)
-              {

                  if (Debug)
                  if (Debug)

-                    std::clog << OutputInDepth(Depth) << "  Ignore not-installed version " << Ver.VerStr() << " of " << Pkg.FullName() << " for " << End << std::endl;
+                 {
+                    if (End->Type == pkgCache::Dep::DpkgBreaks)
+                       clog << OutputInDepth(Depth) << "Because of breaks knot, deconfigure " << ConflictPkg.FullName() << " temporarily" << endl;
+                    else
+                       clog << OutputInDepth(Depth) << "Because of conflict knot, removing " << ConflictPkg.FullName() << " temporarily" << endl;
+                 }
+                 if (EarlyRemove(ConflictPkg, &End) == false)
+                    return _error->Error("Internal Error, Could not early remove %s (2)",ConflictPkg.FullName().c_str());
+                 SomethingBad = true;

                  continue;
               }
 
                  continue;
               }
 

-              // Check if it needs to be unpacked
-              if (List->IsFlag(BrokenPkg,pkgOrderList::InList) && Cache[BrokenPkg].Delete() == false &&
-                  List->IsNow(BrokenPkg))
+              if (Cache[ConflictPkg].Delete() == false)

               {
               {

-                 if (List->IsFlag(BrokenPkg,pkgOrderList::Loop) && PkgLoop)
+                 if (Debug)

                  {
                  {

-                    // This dependency has already been dealt with by another SmartUnPack on Pkg
-                    break;
+                    clog << OutputInDepth(Depth) << "Unpacking " << ConflictPkg.FullName() << " to avoid " << End;
+                    if (PkgLoop == true)
+                       clog << " (Looping)";
+                    clog << std::endl;

                  }
                  }

-                 else
+                 // we would like to avoid temporary removals and all that at best via a simple unpack
+                 _error->PushToStack();
+                 if (NonLoopingSmart(UNPACK, Pkg, ConflictPkg, Depth, PkgLoop, NULL, &Changed) == false)

                  {
                  {

-                    // Found a break, so see if we can unpack the package to avoid it
-                    // but do not set loop if another SmartUnPack already deals with it
-                    // Also, avoid it if the package we would unpack pre-depends on this one
-                    VerIterator InstallVer(Cache,Cache[BrokenPkg].InstallVer);
-                    bool circle = false;
-                    for (pkgCache::DepIterator D = InstallVer.DependsList(); D.end() == false; ++D)
+                    // but if it fails ignore this failure and look for alternative ways of solving
+                    if (Debug)
+                    {
+                       clog << OutputInDepth(Depth) << "Avoidance unpack of " << ConflictPkg.FullName() << " failed for " << End << std::endl;
+                       _error->DumpErrors(std::clog);
+                    }
+                    _error->RevertToStack();
+                    // ignorance can only happen if a) one of the offenders is already gone
+                    if (List->IsFlag(ConflictPkg,pkgOrderList::Removed) == true)

                     {
                     {

-                       if (D->Type != pkgCache::Dep::PreDepends)
-                          continue;
-                       SPtrArray<Version *> VL = D.AllTargets();
-                       for (Version **I = VL; *I != 0; ++I)
-                       {
-                          VerIterator V(Cache,*I);
-                          PkgIterator P = V.ParentPkg();
-                          // we are checking for installation as an easy 'protection' against or-groups and (unchosen) providers
-                          if (P != Pkg || (P.CurrentVer() != V && Cache[P].InstallVer != V))
-                             continue;
-                          circle = true;
-                          break;
-                       }
-                       if (circle == true)
-                          break;
+                       if (Debug)
+                          clog << OutputInDepth(Depth) << "But " << ConflictPkg.FullName() << " was temporarily removed in the meantime to satisfy " << End << endl;

                     }
                     }

-                    if (circle == true)
+                    else if (List->IsFlag(Pkg,pkgOrderList::Removed) == true)

                     {
                        if (Debug)
                     {
                        if (Debug)

-                          clog << OutputInDepth(Depth) << "  Avoiding " << End << " avoided as " << BrokenPkg.FullName() << " has a pre-depends on " << Pkg.FullName() << std::endl;
-                       continue;
+                          clog << OutputInDepth(Depth) << "But " << Pkg.FullName() << " was temporarily removed in the meantime to satisfy " << End << endl;

                     }
                     }

+                    // or b) we can make one go (removal or dpkg auto-deconfigure)

                     else
                     {
                        if (Debug)
                     else
                     {
                        if (Debug)

-                       {
-                          clog << OutputInDepth(Depth) << "  Unpacking " << BrokenPkg.FullName() << " to avoid " << End;
-                          if (PkgLoop == true)
-                             clog << " (Looping)";
-                          clog << std::endl;
-                       }
-                       if (PkgLoop == false)
-                          List->Flag(Pkg,pkgOrderList::Loop);
-                       if (SmartUnPack(BrokenPkg, false, Depth + 1) == true)
-                       {
-                          if (List->IsFlag(BrokenPkg,pkgOrderList::Loop) == false)
-                             Changed = true;
-                       }
-                       if (PkgLoop == false)
-                          List->RmFlag(Pkg,pkgOrderList::Loop);
+                          clog << OutputInDepth(Depth) << "So temprorary remove/deconfigure " << ConflictPkg.FullName() << " to satisfy " << End << endl;
+                       if (EarlyRemove(ConflictPkg, &End) == false)
+                          return _error->Error("Internal Error, Could not early remove %s (2)",ConflictPkg.FullName().c_str());

                     }
                  }
                     }
                  }

+                 else
+                    _error->MergeWithStack();

               }
               }

-              // Check if a package needs to be removed
-              else if (Cache[BrokenPkg].Delete() == true && List->IsFlag(BrokenPkg,pkgOrderList::Configured) == false)
+              else

               {
                  if (Debug)
               {
                  if (Debug)

-                    clog << OutputInDepth(Depth) << "  Removing " << BrokenPkg.FullName() << " to avoid " << End << endl;
-                 SmartRemove(BrokenPkg);
+                    clog << OutputInDepth(Depth) << "Removing " << ConflictPkg.FullName() << " now to avoid " << End << endl;
+                 // no earlyremove() here as user has already agreed to the permanent removal
+                 if (SmartRemove(Pkg) == false)
+                    return _error->Error("Internal Error, Could not early remove %s (1)",ConflictPkg.FullName().c_str());

               }
            }
         }
               }
            }
         }


@@ -858,7 +884,17 @@ bool pkgPackageManager::SmartUnPack(PkgIterator Pkg, bool const Immediate, int c
       if (i++ > max_loops)
          return _error->Error("Internal error: APT::pkgPackageManager::MaxLoopCount reached in SmartConfigure for %s, aborting", Pkg.FullName().c_str());
    } while (Changed == true);
       if (i++ > max_loops)
          return _error->Error("Internal error: APT::pkgPackageManager::MaxLoopCount reached in SmartConfigure for %s, aborting", Pkg.FullName().c_str());
    } while (Changed == true);

-   
+
+   if (SomethingBad == true)
+      return _error->Error("Couldn't configure %s, probably a dependency cycle.", Pkg.FullName().c_str());
+
+   if (couldBeTemporaryRemoved == true && List->IsFlag(Pkg,pkgOrderList::Removed) == true)
+   {
+      if (Debug)
+        std::clog << OutputInDepth(Depth) << "Prevent unpack as " << Pkg << " is currently temporarily removed" << std::endl;
+      return true;
+   }
+

    // Check for reverse conflicts.
    if (CheckRConflicts(Pkg,Pkg.RevDependsList(),
                   instVer.VerStr()) == false)
    // Check for reverse conflicts.
    if (CheckRConflicts(Pkg,Pkg.RevDependsList(),
                   instVer.VerStr()) == false)


@@ -919,7 +955,7 @@ bool pkgPackageManager::SmartUnPack(PkgIterator Pkg, bool const Immediate, int c
    if (Immediate == true) {
       // Perform immedate configuration of the package. 
          if (SmartConfigure(Pkg, Depth + 1) == false)
    if (Immediate == true) {
       // Perform immedate configuration of the package. 
          if (SmartConfigure(Pkg, Depth + 1) == false)

-            _error->Warning(_("Could not perform immediate configuration on '%s'. "
+            _error->Error(_("Could not perform immediate configuration on '%s'. "

                "Please see man 5 apt.conf under APT::Immediate-Configure for details. (%d)"),Pkg.FullName().c_str(),2);
    }
    
                "Please see man 5 apt.conf under APT::Immediate-Configure for details. (%d)"),Pkg.FullName().c_str(),2);
    }
    


@@ -955,21 +991,14 @@ pkgPackageManager::OrderResult pkgPackageManager::OrderInstall()
    for (pkgOrderList::iterator I = List->begin(); I != List->end(); ++I)
    {
       PkgIterator Pkg(Cache,*I);
    for (pkgOrderList::iterator I = List->begin(); I != List->end(); ++I)
    {
       PkgIterator Pkg(Cache,*I);

-      
+

       if (List->IsNow(Pkg) == false)
       {
       if (List->IsNow(Pkg) == false)
       {

-         if (!List->IsFlag(Pkg,pkgOrderList::Configured) && !NoImmConfigure) {
-            if (SmartConfigure(Pkg, 0) == false && Debug)
-               _error->Warning("Internal Error, Could not configure %s",Pkg.FullName().c_str());
-            // FIXME: The above warning message might need changing
-         } else {
-           if (Debug == true)
-              clog << "Skipping already done " << Pkg.FullName() << endl;
-        }
+        if (Debug == true)
+           clog << "Skipping already done " << Pkg.FullName() << endl;

         continue;
         continue;

-        

       }
       }

-      
+

       if (List->IsMissing(Pkg) == true)
       {
         if (Debug == true)
       if (List->IsMissing(Pkg) == true)
       {
         if (Debug == true)