Detect Early removal of essential libraries

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

diff --git a/apt-pkg/packagemanager.cc b/apt-pkg/packagemanager.cc
index 68827f5..772ad4a 100644 (file)
--- a/apt-pkg/packagemanager.cc
+++ b/apt-pkg/packagemanager.cc
@@ -1,6 +1,6 @@
 // -*- mode: cpp; mode: fold -*-
 // Description                                                         /*{{{*/
-// $Id: packagemanager.cc,v 1.19 1999/08/03 05:19:41 jgg Exp $
+// $Id: packagemanager.cc,v 1.24 1999/12/24 21:10:56 jgg Exp $
 /* ######################################################################
 
    Package Manager - Abstacts the package manager
@@ -157,6 +157,7 @@ bool pkgPackageManager::CreateOrderList()
       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;
@@ -194,19 +195,22 @@ bool pkgPackageManager::CheckRConflicts(PkgIterator Pkg,DepIterator D,
    {
       if (D->Type != pkgCache::Dep::Conflicts)
         continue;
+
+      // The package hasnt been changed
+      if (List->IsNow(Pkg) == false)
+        continue;
       
-      if (D.ParentPkg() == Pkg)
+      // Ignore self conflicts, ignore conflicts from irrelevent versions
+      if (D.ParentPkg() == Pkg || D.ParentVer() != D.ParentPkg().CurrentVer())
         continue;
       
       if (pkgCheckDep(D.TargetVer(),Ver,D->CompareOp) == false)
         continue;
-
-      if (List->IsNow(Pkg) == false)
-        continue;
       
       if (EarlyRemove(D.ParentPkg()) == false)
-        return false;
-   }  
+        return _error->Error("Reverse conflicts early remove for package '%s' failed",
+                             Pkg.Name());
+   }
    return true;
 }
                                                                        /*}}}*/
@@ -364,6 +368,32 @@ bool pkgPackageManager::EarlyRemove(PkgIterator Pkg)
    // 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)
@@ -403,12 +433,17 @@ bool pkgPackageManager::SmartUnPack(PkgIterator Pkg)
    /* See if this packages install version has any predependencies
       that are not met by 'now' packages. */
    for (DepIterator D = Cache[Pkg].InstVerIter(Cache).DependsList(); 
-       D.end() == false; D++)
+       D.end() == false; )
    {
-      if (D->Type == pkgCache::Dep::PreDepends)
+      // Compute a single dependency element (glob or)
+      pkgCache::DepIterator Start;
+      pkgCache::DepIterator End;
+      D.GlobOr(Start,End);
+      
+      while (End->Type == pkgCache::Dep::PreDepends)
       {
         // Look for possible ok targets.
-        Version **VList = D.AllTargets();
+        Version **VList = Start.AllTargets();
         bool Bad = true;
         for (Version **I = VList; *I != 0 && Bad == true; I++)
         {
@@ -439,18 +474,24 @@ bool pkgPackageManager::SmartUnPack(PkgIterator Pkg)
         }
         
         delete [] VList;
-        
-        if (Bad == true)
-           return _error->Error("Internal Error, Couldn't configure a pre-depend");
 
-        continue;
+        /* If this or element did not match then continue on to the
+           next or element until a matching element is found*/
+        if (Bad == true)
+        {          
+           if (Start == End)
+              return _error->Error("Internal Error, Couldn't configure a pre-depend");
+           Start++;
+        }
+        else
+           break;
       }
       
-      if (D->Type == pkgCache::Dep::Conflicts)
+      if (End->Type == pkgCache::Dep::Conflicts)
       {
         /* Look for conflicts. Two packages that are both in the install
            state cannot conflict so we don't check.. */
-        Version **VList = D.AllTargets();
+        Version **VList = End.AllTargets();
         for (Version **I = VList; *I != 0; I++)
         {
            VerIterator Ver(Cache,*I);
@@ -468,8 +509,10 @@ bool pkgPackageManager::SmartUnPack(PkgIterator Pkg)
    }
 
    // Check for reverse conflicts.
-   CheckRConflicts(Pkg,Pkg.RevDependsList(),
-                  Cache[Pkg].InstVerIter(Cache).VerStr());
+   if (CheckRConflicts(Pkg,Pkg.RevDependsList(),
+                  Cache[Pkg].InstVerIter(Cache).VerStr()) == false)
+      return false;
+   
    for (PrvIterator P = Cache[Pkg].InstVerIter(Cache).ProvidesList(); 
        P.end() == false; P++)
       CheckRConflicts(Pkg,P.ParentPkg().RevDependsList(),P.ProvideVersion());
@@ -524,7 +567,7 @@ pkgPackageManager::OrderResult pkgPackageManager::OrderInstall()
       if (List->IsMissing(Pkg) == true)
       {
         if (Debug == true)
-           clog << "Sequence completed at" << Pkg.Name() << endl;
+           clog << "Sequence completed at " << Pkg.Name() << endl;
         if (DoneSomething == false)
         {
            _error->Error("Internal Error, ordering was unable to handle the media swap");
@@ -534,7 +577,9 @@ pkgPackageManager::OrderResult pkgPackageManager::OrderInstall()
       }
       
       // Sanity check
-      if (Cache[Pkg].Keep() == true && Pkg.State() == pkgCache::PkgIterator::NeedsNothing)
+      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");
         return Failed;