3 files changed, 27 insertions, 7 deletions
diff --git a/apt-pkg/contrib/strutl.cc b/apt-pkg/contrib/strutl.cc
index 2100ee47b..ce69c7a02 100644
--- a/apt-pkg/contrib/strutl.cc
+++ b/apt-pkg/contrib/strutl.cc
@@ -434,23 +434,30 @@ string TimeToStr(unsigned long Sec)
 /* This replaces all occurrences of Subst with Contents in Str. */
 string SubstVar(const string &Str,const string &Subst,const string &Contents)
 {
+   if (Subst.empty() == true)
+      return Str;
+
    string::size_type Pos = 0;
    string::size_type OldPos = 0;
    string Temp;
-   
-   while (OldPos < Str.length() && 
+
+   while (OldPos < Str.length() &&
 	  (Pos = Str.find(Subst,OldPos)) != string::npos)
    {
-      Temp += string(Str,OldPos,Pos) + Contents;
-      OldPos = Pos + Subst.length();      
+      if (OldPos != Pos)
+	 Temp.append(Str, OldPos, Pos - OldPos);
+      if (Contents.empty() == false)
+	 Temp.append(Contents);
+      OldPos = Pos + Subst.length();
    }
-   
+
    if (OldPos == 0)
       return Str;
-   
+
+   if (OldPos >= Str.length())
+      return Temp;
    return Temp + string(Str,OldPos);
 }
-
 string SubstVar(string Str,const struct SubstVar *Vars)
 {
    for (; Vars->Subst != 0; Vars++)
diff --git a/apt-pkg/edsp.cc b/apt-pkg/edsp.cc
index 6d1b68c23..0d0418e06 100644
--- a/apt-pkg/edsp.cc
+++ b/apt-pkg/edsp.cc
@@ -26,6 +26,7 @@
 #include <time.h>
 #include <unistd.h>
 #include <stdio.h>
+#include <algorithm>
 #include <iostream>
 #include <vector>
 #include <limits>
@@ -50,7 +51,12 @@ bool EDSP::WriteScenario(pkgDepCache &Cache, FILE* output, OpProgress *Progress)
    if (Progress != NULL)
       Progress->SubProgress(Cache.Head().VersionCount, _("Send scenario to solver"));
    unsigned long p = 0;
+   std::vector<std::string> archs = APT::Configuration::getArchitectures();
    for (pkgCache::PkgIterator Pkg = Cache.PkgBegin(); Pkg.end() == false; ++Pkg)
+   {
+      std::string const arch = Pkg.Arch();
+      if (std::find(archs.begin(), archs.end(), arch) == archs.end())
+	 continue;
       for (pkgCache::VerIterator Ver = Pkg.VersionList(); Ver.end() == false; ++Ver, ++p)
       {
 	 WriteScenarioVersion(Cache, output, Pkg, Ver);
@@ -59,6 +65,7 @@ bool EDSP::WriteScenario(pkgDepCache &Cache, FILE* output, OpProgress *Progress)
 	 if (Progress != NULL && p % 100 == 0)
 	    Progress->Progress(p);
       }
+   }
    return true;
 }
 									/*}}}*/
diff --git a/apt-pkg/upgrade.cc b/apt-pkg/upgrade.cc
index 7926845c2..29b11937b 100644
--- a/apt-pkg/upgrade.cc
+++ b/apt-pkg/upgrade.cc
@@ -143,6 +143,12 @@ static bool pkgAllUpgradeNoNewPackages(pkgDepCache &Cache)
  */
 static bool pkgAllUpgradeWithNewPackages(pkgDepCache &Cache)
 {
+   std::string const solver = _config->Find("APT::Solver", "internal");
+   if (solver != "internal") {
+      OpTextProgress Prog(*_config);
+      return EDSP::ResolveExternal(solver.c_str(), Cache, true, false, false, &Prog);
+   }
+
    pkgDepCache::ActionGroup group(Cache);
 
    pkgProblemResolver Fix(&Cache);