* apt-pkg/pkgcachegen.cc:

  - fallback to memory if file is not writeable even if access()
    told us the opposite before (e.g. in fakeroot 1.16) (Closes: #630591)

apt-pkg/pkgcachegen.cc

@@ -1169,16 +1169,32 @@ bool pkgCacheGenerator::MakeStatusCache(pkgSourceList &List,OpProgress *Progress
    SPtr<DynamicMMap> Map;
    if (Writeable == true && CacheFile.empty() == false)
    {
+      _error->PushToStack();
       unlink(CacheFile.c_str());
       CacheF = new FileFd(CacheFile,FileFd::WriteAtomic);
       fchmod(CacheF->Fd(),0644);
       Map = CreateDynamicMMap(CacheF, MMap::Public);
       if (_error->PendingError() == true)
-	 return false;
-      if (Debug == true)
+      {
+	 delete CacheF.UnGuard();
+	 delete Map.UnGuard();
+	 if (Debug == true)
+	    std::clog << "Open filebased MMap FAILED" << std::endl;
+	 Writeable = false;
+	 if (AllowMem == false)
+	 {
+	    _error->MergeWithStack();
+	    return false;
+	 }
+	 _error->RevertToStack();
+      }
+      else if (Debug == true)
+      {
+	 _error->MergeWithStack();
 	 std::clog << "Open filebased MMap" << std::endl;
+      }
    }
-   else
+   if (Writeable == false || CacheFile.empty() == true)
    {
       // Just build it in memory..
       Map = CreateDynamicMMap(NULL);

debian/changelog

@@ -1,3 +1,12 @@
+apt (0.8.15.2) unstable; urgency=low
+
+  [ David Kalnischkies ]
+  * apt-pkg/pkgcachegen.cc:
+    - fallback to memory if file is not writeable even if access()
+      told us the opposite before (e.g. in fakeroot 1.16) (Closes: #630591)
+
+ -- David Kalnischkies <kalnischkies@gmail.com>  Thu, 30 Jun 2011 14:00:54 +0200
+
 apt (0.8.15.1) unstable; urgency=low
 
   [ David Kalnischkies ]