eipp: avoid producing file warnings in simulation

Simulations are frequently run by unprivileged users which naturally
don't have the permissions to write to the default location for the eipp
file. Either way is bad as running in simulation mode doesn't mean we
don't want to run the logging (as EIPP runs the same regardless of
simulation or 'real' run), but showing the warnings is relatively
pointless in the default setup, so, in case we would produce errors and
perform a simulation we will discard the warnings and carry on.

Running apt with an external planner wouldn't have generated these
messages btw.

Closes: 832614

apt-pkg/edsp.cc

@@ -7,6 +7,7 @@
 // Include Files							/*{{{*/
 #include <config.h>
 
+#include <apt-pkg/algorithms.h>
 #include <apt-pkg/error.h>
 #include <apt-pkg/cacheset.h>
 #include <apt-pkg/depcache.h>
@@ -1016,32 +1017,38 @@ bool EDSP::ExecuteSolver(const char* const solver, int *solver_in, int *solver_o
    return true;
 }
 									/*}}}*/
+static bool CreateDumpFile(char const * const id, char const * const type, FileFd &output)/*{{{*/
+{
+	auto const dumpfile = _config->FindFile((std::string("Dir::Log::") + type).c_str());
+	if (dumpfile.empty())
+		return false;
+	auto const dumpdir = flNotFile(dumpfile);
+	_error->PushToStack();
+	bool errored_out = CreateAPTDirectoryIfNeeded(dumpdir, dumpdir) == false ||
+	   output.Open(dumpfile, FileFd::WriteOnly | FileFd::Exclusive | FileFd::Create, FileFd::Extension, 0644) == false;
+	std::vector<std::string> downgrademsgs;
+	while (_error->empty() == false)
+	{
+		std::string msg;
+		_error->PopMessage(msg);
+		downgrademsgs.emplace_back(std::move(msg));
+	}
+	_error->RevertToStack();
+	for (auto && msg : downgrademsgs)
+	   _error->Warning("%s", msg.c_str());
+	if (errored_out)
+		return _error->WarningE(id, _("Could not open file '%s'"), dumpfile.c_str());
+	return true;
+}
+									/*}}}*/
 // EDSP::ResolveExternal - resolve problems by asking external for help	{{{*/
 bool EDSP::ResolveExternal(const char* const solver, pkgDepCache &Cache,
 			 unsigned int const flags, OpProgress *Progress) {
 	if (strcmp(solver, "internal") == 0)
 	{
-		auto const dumpfile = _config->FindFile("Dir::Log::Solver");
-		if (dumpfile.empty())
-			return false;
-		auto const dumpdir = flNotFile(dumpfile);
 		FileFd output;
-		_error->PushToStack();
-		bool errored_out = CreateAPTDirectoryIfNeeded(dumpdir, dumpdir) == false ||
-		   output.Open(dumpfile, FileFd::WriteOnly | FileFd::Exclusive | FileFd::Create, FileFd::Extension, 0644) == false;
-		std::vector<std::string> downgrademsgs;
-		while (_error->empty() == false)
-		{
-		   std::string msg;
-		   _error->PopMessage(msg);
-		   downgrademsgs.emplace_back(std::move(msg));
-		}
-		_error->RevertToStack();
-		for (auto && msg : downgrademsgs)
-		   _error->Warning("%s", msg.c_str());
-		if (errored_out)
-			return _error->WarningE("EDSP::Resolve", _("Could not open file '%s'"), dumpfile.c_str());
-		bool Okay = EDSP::WriteRequest(Cache, output, flags, nullptr);
+		bool Okay = CreateDumpFile("EDSP::Resolve", "solver", output);
+		Okay &= EDSP::WriteRequest(Cache, output, flags, nullptr);
 		return Okay && EDSP::WriteScenario(Cache, output, nullptr);
 	}
 	int solver_in, solver_out;
@@ -1088,27 +1095,16 @@ bool EIPP::OrderInstall(char const * const solver, pkgPackageManager * const PM,
 {
    if (strcmp(solver, "internal") == 0)
    {
-      auto const dumpfile = _config->FindFile("Dir::Log::Planner");
-      if (dumpfile.empty())
-	 return false;
-      auto const dumpdir = flNotFile(dumpfile);
       FileFd output;
       _error->PushToStack();
-      bool errored_out = CreateAPTDirectoryIfNeeded(dumpdir, dumpdir) == false ||
-	    output.Open(dumpfile, FileFd::WriteOnly | FileFd::Exclusive | FileFd::Create, FileFd::Extension, 0644) == false;
-      std::vector<std::string> downgrademsgs;
-      while (_error->empty() == false)
+      bool Okay = CreateDumpFile("EIPP::OrderInstall", "planner", output);
+      if (Okay == false && dynamic_cast<pkgSimulate*>(PM) != nullptr)
       {
-	 std::string msg;
-	 _error->PopMessage(msg);
-	 downgrademsgs.emplace_back(std::move(msg));
+	 _error->RevertToStack();
+	 return false;
       }
-      _error->RevertToStack();
-      for (auto && msg : downgrademsgs)
-	 _error->Warning("%s", msg.c_str());
-      if (errored_out)
-	 return _error->WarningE("EIPP::OrderInstall", _("Could not open file '%s'"), dumpfile.c_str());
-      bool Okay = EIPP::WriteRequest(PM->Cache, output, flags, nullptr);
+      _error->MergeWithStack();
+      Okay &= EIPP::WriteRequest(PM->Cache, output, flags, nullptr);
       return Okay && EIPP::WriteScenario(PM->Cache, output, nullptr);
    }