implement Fail-Ignore bool in FetchItem that tells the method that a failure of this item is ok and does not need to be tried on all mirrors

apt-pkg/acquire-item.cc

@@ -820,6 +820,13 @@ pkgAcqIndexTrans::pkgAcqIndexTrans(pkgAcquire *Owner,
 			    string URI,string URIDesc,string ShortDesc) 
   : pkgAcqIndex(Owner, URI, URIDesc, ShortDesc, HashString(), "")
 {
+}
+									/*}}}*/
+// AcqIndexTrans::Custom600Headers - Insert custom request headers	/*{{{*/
+// ---------------------------------------------------------------------
+string pkgAcqIndexTrans::Custom600Headers()
+{
+   return "\nFail-Ignore: true";
 }
 									/*}}}*/
 // AcqIndexTrans::Failed - Silence failure messages for missing files	/*{{{*/

apt-pkg/acquire-item.h

@@ -573,6 +573,7 @@ class pkgAcqIndexTrans : public pkgAcqIndex
    public:
   
    virtual void Failed(string Message,pkgAcquire::MethodConfig *Cnf);
+   virtual string Custom600Headers();
 
    /** \brief Create a pkgAcqIndexTrans.
     *

apt-pkg/acquire-method.cc

@@ -381,6 +381,7 @@ int pkgAcqMethod::Run(bool Single)
 	    if (StrToTime(LookupTag(Message,"Last-Modified"),Tmp->LastModified) == false)
 	       Tmp->LastModified = 0;
 	    Tmp->IndexFile = StringToBool(LookupTag(Message,"Index-File"),false);
+	    Tmp->FailIgnore = StringToBool(LookupTag(Message,"Fail-Ignore"),false);
 	    Tmp->Next = 0;
 	    
 	    // Append it to the list

apt-pkg/acquire-method.h

@@ -37,6 +37,7 @@ class pkgAcqMethod
       string DestFile;
       time_t LastModified;
       bool IndexFile;
+      bool FailIgnore;
    };
    
    struct FetchResult

methods/mirror.cc

@@ -162,24 +162,26 @@ void MirrorMethod::CurrentQueueUriToMirror()
       }
    }
    _error->Error("Internal error: Failed to convert %s back to %s",
-		 Queue->Uri, BaseUri);
+		 Queue->Uri.c_str(), BaseUri.c_str());
 }
 
 bool MirrorMethod::TryNextMirror()
 {
-   if(Debug)
-      cerr << "using mirror: " << Mirror << endl;
-
    // find current mirror and select next one
    for (int i=0; i < AllMirrors.size()-1; i++) 
    {
       if (Queue->Uri.find(AllMirrors[i]) == 0)
       {
 	 Queue->Uri.replace(0, AllMirrors[i].size(), AllMirrors[i+1]);
+	 if (Debug)
+	    clog << "TryNextMirror: " << Queue->Uri << endl;
 	 return true;
       }
    }
 
+   if (Debug)
+      clog << "TryNextMirror could not find another mirror to try" << endl;
+
    return false;
 }
 
@@ -307,15 +309,12 @@ bool MirrorMethod::Fetch(FetchItem *Itm)
 	 return false;
       }
    }
-   if(Debug)
-      clog << "selected mirror: " << Mirror << endl;
 
+   if(Itm->Uri.find("mirror://") != string::npos)
+      Itm->Uri.replace(0,BaseUri.size(), Mirror);
 
-   for (FetchItem *I = Queue; I != 0; I = I->Next)
-   {
-      if(I->Uri.find("mirror://") != string::npos)
-	 I->Uri.replace(0,BaseUri.size(), Mirror);
-   }
+   if(Debug)
+      clog << "Fetch: " << Itm->Uri << endl << endl;
    
    // now run the real fetcher
    return HttpMethod::Fetch(Itm);
@@ -324,7 +323,7 @@ bool MirrorMethod::Fetch(FetchItem *Itm)
 void MirrorMethod::Fail(string Err,bool Transient)
 {
    // try the next mirror on fail
-   if (TryNextMirror()) 
+   if (!Queue->FailIgnore && TryNextMirror()) 
       return;
 
    // all mirrors failed, so bail out