]> git.saurik.com Git - apt.git/blobdiff - apt-pkg/acquire-item.cc
allow pdiff bootstrap from all supported compressors
[apt.git] / apt-pkg / acquire-item.cc
index 864b9318819fce5f4b29b6ae2d4e06ac958ec5b9..82ccaff64ebf59adfadb2c9ce48ccd9014560a1c 100644 (file)
@@ -22,7 +22,6 @@
 #include <apt-pkg/error.h>
 #include <apt-pkg/strutl.h>
 #include <apt-pkg/fileutl.h>
-#include <apt-pkg/sha1.h>
 #include <apt-pkg/tagfile.h>
 #include <apt-pkg/metaindex.h>
 #include <apt-pkg/acquire.h>
@@ -33,6 +32,7 @@
 #include <apt-pkg/pkgrecords.h>
 #include <apt-pkg/gpgv.h>
 
+#include <algorithm>
 #include <stddef.h>
 #include <stdlib.h>
 #include <string.h>
@@ -42,9 +42,9 @@
 #include <unistd.h>
 #include <errno.h>
 #include <string>
-#include <sstream>
 #include <stdio.h>
 #include <ctime>
+#include <sstream>
 
 #include <apti18n.h>
                                                                        /*}}}*/
@@ -80,6 +80,21 @@ static std::string GetFinalFileNameFromURI(std::string const &uri)   /*{{{*/
    return _config->FindDir("Dir::State::lists") + URItoFileName(uri);
 }
                                                                        /*}}}*/
+static std::string GetKeepCompressedFileName(std::string file, IndexTarget const &Target)/*{{{*/
+{
+   if (Target.KeepCompressed == false)
+      return file;
+
+   std::string const CompressionTypes = Target.Option(IndexTarget::COMPRESSIONTYPES);
+   if (CompressionTypes.empty() == false)
+   {
+      std::string const ext = CompressionTypes.substr(0, CompressionTypes.find(' '));
+      if (ext != "uncompressed")
+        file.append(".").append(ext);
+   }
+   return file;
+}
+                                                                       /*}}}*/
 static std::string GetCompressedFileName(IndexTarget const &Target, std::string const &Name, std::string const &Ext) /*{{{*/
 {
    if (Ext.empty() || Ext == "uncompressed")
@@ -108,13 +123,55 @@ static std::string GetDiffsPatchFileName(std::string const &Final)        /*{{{*/
    return Final + ".ed";
 }
                                                                        /*}}}*/
+static std::string GetExistingFilename(std::string const &File)                /*{{{*/
+{
+   if (RealFileExists(File))
+      return File;
+   for (auto const &type : APT::Configuration::getCompressorExtensions())
+   {
+      std::string const Final = File + type;
+      if (RealFileExists(Final))
+        return Final;
+   }
+   return "";
+}
+                                                                       /*}}}*/
 
-static bool AllowInsecureRepositories(metaIndex const * const MetaIndexParser, pkgAcqMetaClearSig * const TransactionManager, pkgAcquire::Item * const I) /*{{{*/
+static bool MessageInsecureRepository(bool const isError, std::string const &msg)/*{{{*/
+{
+   if (isError)
+   {
+      _error->Error("%s", msg.c_str());
+      _error->Notice("%s", _("Updating from such a repository can't be done securely, and is therefore disabled by default."));
+   }
+   else
+   {
+      _error->Warning("%s", msg.c_str());
+      _error->Notice("%s", _("Data from such a repository can't be authenticated and is therefore potentially dangerous to use."));
+   }
+   _error->Notice("%s", _("See apt-secure(8) manpage for repository creation and user configuration details."));
+   return false;
+}
+static bool MessageInsecureRepository(bool const isError, char const * const msg, std::string const &repo)
+{
+   std::string m;
+   strprintf(m, msg, repo.c_str());
+   return MessageInsecureRepository(isError, m);
+}
+                                                                       /*}}}*/
+static bool AllowInsecureRepositories(char const * const msg, std::string const &repo,/*{{{*/
+      metaIndex const * const MetaIndexParser, pkgAcqMetaClearSig * const TransactionManager, pkgAcquire::Item * const I)
 {
-   if(MetaIndexParser->GetTrusted() == metaIndex::TRI_YES || _config->FindB("Acquire::AllowInsecureRepositories") == true)
+   if(MetaIndexParser->GetTrusted() == metaIndex::TRI_YES)
       return true;
 
-   _error->Error(_("Use --allow-insecure-repositories to force the update"));
+   if (_config->FindB("Acquire::AllowInsecureRepositories") == true)
+   {
+      MessageInsecureRepository(false, msg, repo);
+      return true;
+   }
+
+   MessageInsecureRepository(true, msg, repo);
    TransactionManager->AbortTransaction();
    I->Status = pkgAcquire::Item::StatError;
    return false;
@@ -145,7 +202,7 @@ APT_CONST bool pkgAcqTransactionItem::HashesRequired() const
       Only repositories without a Release file can (obviously) not have
       hashes – and they are very uncommon and strongly discouraged */
    return TransactionManager->MetaIndexParser != NULL &&
-      TransactionManager->MetaIndexParser->GetLoadedSuccessfully() != metaIndex::TRI_UNSET;
+      TransactionManager->MetaIndexParser->GetLoadedSuccessfully() == metaIndex::TRI_YES;
 }
 HashStringList pkgAcqTransactionItem::GetExpectedHashes() const
 {
@@ -320,16 +377,43 @@ bool pkgAcqTransactionItem::TransactionState(TransactionStates const state)
         }
         break;
       case TransactionCommit:
-        if(PartialFile != "")
+        if(PartialFile.empty() == false)
         {
-           if(Debug == true)
-              std::clog << "mv " << PartialFile << " -> "<< DestFile << " # " << DescURI() << std::endl;
+           if (PartialFile != DestFile)
+           {
+              // ensure that even without lists-cleanup all compressions are nuked
+              std::string FinalFile = GetFinalFileNameFromURI(Target.URI);
+              if (FileExists(FinalFile))
+              {
+                 if(Debug == true)
+                    std::clog << "rm " << FinalFile << " # " << DescURI() << std::endl;
+                 if (RemoveFile("TransactionStates-Cleanup", FinalFile) == false)
+                    return false;
+              }
+              for (auto const &ext: APT::Configuration::getCompressorExtensions())
+              {
+                 auto const Final = FinalFile + ext;
+                 if (FileExists(Final))
+                 {
+                    if(Debug == true)
+                       std::clog << "rm " << Final << " # " << DescURI() << std::endl;
+                    if (RemoveFile("TransactionStates-Cleanup", Final) == false)
+                       return false;
+                 }
+              }
+              if(Debug == true)
+                 std::clog << "mv " << PartialFile << " -> "<< DestFile << " # " << DescURI() << std::endl;
+              if (Rename(PartialFile, DestFile) == false)
+                 return false;
+           }
+           else if(Debug == true)
+              std::clog << "keep " << PartialFile << " # " << DescURI() << std::endl;
 
-           Rename(PartialFile, DestFile);
         } else {
            if(Debug == true)
               std::clog << "rm " << DestFile << " # " << DescURI() << std::endl;
-           unlink(DestFile.c_str());
+           if (RemoveFile("TransactionCommit", DestFile) == false)
+              return false;
         }
         break;
    }
@@ -354,13 +438,13 @@ bool pkgAcqIndex::TransactionState(TransactionStates const state)
         {
            // keep the compressed file, but drop the decompressed
            EraseFileName.clear();
-           if (PartialFile.empty() == false && flExtension(PartialFile) == "decomp")
-              unlink(PartialFile.c_str());
+           if (PartialFile.empty() == false && flExtension(PartialFile) != CurrentCompressionExtension)
+              RemoveFile("TransactionAbort", PartialFile);
         }
         break;
       case TransactionCommit:
         if (EraseFileName.empty() == false)
-           unlink(EraseFileName.c_str());
+           RemoveFile("TransactionCommit", EraseFileName);
         break;
    }
    return true;
@@ -376,7 +460,7 @@ bool pkgAcqDiffIndex::TransactionState(TransactionStates const state)
         break;
       case TransactionAbort:
         std::string const Partial = GetPartialFileNameFromURI(Target.URI);
-        unlink(Partial.c_str());
+        RemoveFile("TransactionAbort", Partial);
         break;
    }
 
@@ -400,6 +484,12 @@ class APT_HIDDEN NoActionItem : public pkgAcquire::Item                    /*{{{*/
       Status = StatDone;
       DestFile = GetFinalFileNameFromURI(Target.URI);
    }
+   NoActionItem(pkgAcquire * const Owner, IndexTarget const &Target, std::string const &FinalFile) :
+      pkgAcquire::Item(Owner), Target(Target)
+   {
+      Status = StatDone;
+      DestFile = FinalFile;
+   }
 };
                                                                        /*}}}*/
 
@@ -457,7 +547,6 @@ void pkgAcquire::Item::Failed(string const &Message,pkgAcquire::MethodConfig con
 {
    if(ErrorText.empty())
       ErrorText = LookupTag(Message,"Message");
-   UsedMirror =  LookupTag(Message,"UsedMirror");
    if (QueueCounter <= 1)
    {
       /* This indicates that the file is not available right now but might
@@ -515,12 +604,28 @@ void pkgAcquire::Item::Start(string const &/*Message*/, unsigned long long const
       FileSize = Size;
 }
                                                                        /*}}}*/
+// Acquire::Item::VerifyDone - check if Item was downloaded OK         /*{{{*/
+/* Note that hash-verification is 'hardcoded' in acquire-worker and has
+ * already passed if this method is called. */
+bool pkgAcquire::Item::VerifyDone(std::string const &Message,
+        pkgAcquire::MethodConfig const * const /*Cnf*/)
+{
+   std::string const FileName = LookupTag(Message,"Filename");
+   if (FileName.empty() == true)
+   {
+      Status = StatError;
+      ErrorText = "Method gave a blank filename";
+      return false;
+   }
+
+   return true;
+}
+                                                                       /*}}}*/
 // Acquire::Item::Done - Item downloaded OK                            /*{{{*/
-void pkgAcquire::Item::Done(string const &Message, HashStringList const &Hashes,
+void pkgAcquire::Item::Done(string const &/*Message*/, HashStringList const &Hashes,
                            pkgAcquire::MethodConfig const * const /*Cnf*/)
 {
    // We just downloaded something..
-   UsedMirror = LookupTag(Message,"UsedMirror");
    if (FileSize == 0)
    {
       unsigned long long const downloadedSize = Hashes.FileSize();
@@ -587,8 +692,8 @@ bool pkgAcquire::Item::RenameOnError(pkgAcquire::Item::RenameOnErrorState const
         Status = StatError;
         break;
       case NotClearsigned:
-        errtext = _("Does not start with a cleartext signature");
-        Status = StatError;
+        strprintf(errtext, _("Clearsigned file isn't valid, got '%s' (does the network require authentication?)"), "NOSPLIT");
+        Status = StatAuthError;
         break;
       case MaximumSizeExceeded:
         // the method is expected to report a good error for this
@@ -775,7 +880,7 @@ bool pkgAcqMetaBase::CheckStopAuthentication(pkgAcquire::Item * const I, const s
       _error->Warning(_("An error occurred during the signature "
                         "verification. The repository is not updated "
                         "and the previous index files will be used. "
-                        "GPG error: %s: %s\n"),
+                        "GPG error: %s: %s"),
                       Desc.Description.c_str(),
                       LookupTag(Message,"Message").c_str());
       RunScripts("APT::Update::Auth-Failure");
@@ -785,7 +890,7 @@ bool pkgAcqMetaBase::CheckStopAuthentication(pkgAcquire::Item * const I, const s
       _error->Error(_("GPG error: %s: %s"),
                     Desc.Description.c_str(),
                     LookupTag(Message,"Message").c_str());
-      I->Status = StatError;
+      I->Status = StatAuthError;
       return true;
    } else {
       _error->Warning(_("GPG error: %s: %s"),
@@ -831,14 +936,7 @@ bool pkgAcqMetaBase::CheckDownloadDone(pkgAcqTransactionItem * const I, const st
    // We have just finished downloading a Release file (it is not
    // verified yet)
 
-   string const FileName = LookupTag(Message,"Filename");
-   if (FileName.empty() == true)
-   {
-      I->Status = StatError;
-      I->ErrorText = "Method gave a blank filename";
-      return false;
-   }
-
+   std::string const FileName = LookupTag(Message,"Filename");
    if (FileName != I->DestFile && RealFileExists(I->DestFile) == false)
    {
       I->Local = true;
@@ -856,7 +954,7 @@ bool pkgAcqMetaBase::CheckDownloadDone(pkgAcqTransactionItem * const I, const st
       if (RealFileExists(FinalFile) && Hashes.VerifyFile(FinalFile) == true)
       {
         IMSHit = true;
-        unlink(I->DestFile.c_str());
+        RemoveFile("CheckDownloadDone", I->DestFile);
       }
    }
 
@@ -946,11 +1044,29 @@ void pkgAcqMetaBase::QueueIndexes(bool const verify)                     /*{{{*/
    // at this point the real Items are loaded in the fetcher
    ExpectedAdditionalItems = 0;
 
-   for (std::vector <IndexTarget>::const_iterator Target = IndexTargets.begin();
+  bool metaBaseSupportsByHash = false;
+  if (TransactionManager != NULL && TransactionManager->MetaIndexParser != NULL)
+     metaBaseSupportsByHash = TransactionManager->MetaIndexParser->GetSupportsAcquireByHash();
+
+   for (std::vector <IndexTarget>::iterator Target = IndexTargets.begin();
         Target != IndexTargets.end();
         ++Target)
    {
-      bool trypdiff = _config->FindB("Acquire::PDiffs", true);
+      // all is an implementation detail. Users shouldn't use this as arch
+      // We need this support trickery here as e.g. Debian has binary-all files already,
+      // but arch:all packages are still in the arch:any files, so we would waste precious
+      // download time, bandwidth and diskspace for nothing, BUT Debian doesn't feature all
+      // in the set of supported architectures, so we can filter based on this property rather
+      // than invent an entirely new flag we would need to carry for all of eternity.
+      if (Target->Option(IndexTarget::ARCHITECTURE) == "all")
+      {
+        if (TransactionManager->MetaIndexParser->IsArchitectureSupported("all") == false)
+           continue;
+        if (TransactionManager->MetaIndexParser->IsArchitectureAllSupportedFor(*Target) == false)
+           continue;
+      }
+
+      bool trypdiff = Target->OptionBool(IndexTarget::PDIFFS);
       if (verify == true)
       {
         if (TransactionManager->MetaIndexParser->Exists(Target->MetaKey) == false)
@@ -959,33 +1075,103 @@ void pkgAcqMetaBase::QueueIndexes(bool const verify)                    /*{{{*/
            if (Target->IsOptional)
               continue;
 
+           std::string const &arch = Target->Option(IndexTarget::ARCHITECTURE);
+           if (arch.empty() == false)
+           {
+              if (TransactionManager->MetaIndexParser->IsArchitectureSupported(arch) == false)
+              {
+                 _error->Notice(_("Skipping acquire of configured file '%s' as repository '%s' doesn't support architecture '%s'"),
+                       Target->MetaKey.c_str(), TransactionManager->Target.Description.c_str(), arch.c_str());
+                 continue;
+              }
+              // if the architecture is officially supported but currently no packages for it available,
+              // ignore silently as this is pretty much the same as just shipping an empty file.
+              // if we don't know which architectures are supported, we do NOT ignore it to notify user about this
+              if (TransactionManager->MetaIndexParser->IsArchitectureSupported("*undefined*") == false)
+                 continue;
+           }
+
            Status = StatAuthError;
            strprintf(ErrorText, _("Unable to find expected entry '%s' in Release file (Wrong sources.list entry or malformed file)"), Target->MetaKey.c_str());
            return;
         }
+        else
+        {
+           auto const hashes = GetExpectedHashesFor(Target->MetaKey);
+           if (hashes.usable() == false && hashes.empty() == false)
+           {
+              _error->Warning(_("Skipping acquire of configured file '%s' as repository '%s' provides only weak security information for it"),
+                       Target->MetaKey.c_str(), TransactionManager->Target.Description.c_str());
+              continue;
+           }
+        }
 
-        if (RealFileExists(GetFinalFileNameFromURI(Target->URI)))
+        // autoselect the compression method
+        std::vector<std::string> types = VectorizeString(Target->Option(IndexTarget::COMPRESSIONTYPES), ' ');
+        types.erase(std::remove_if(types.begin(), types.end(), [&](std::string const &t) {
+           if (t == "uncompressed")
+              return TransactionManager->MetaIndexParser->Exists(Target->MetaKey) == false;
+           std::string const MetaKey = Target->MetaKey + "." + t;
+           return TransactionManager->MetaIndexParser->Exists(MetaKey) == false;
+        }), types.end());
+        if (types.empty() == false)
         {
-           if (TransactionManager->LastMetaIndexParser != NULL)
+           std::ostringstream os;
+           // add the special compressiontype byhash first if supported
+           std::string const useByHashConf = Target->Option(IndexTarget::BY_HASH);
+           bool useByHash = false;
+           if(useByHashConf == "force")
+              useByHash = true;
+           else
+              useByHash = StringToBool(useByHashConf) == true && metaBaseSupportsByHash;
+           if (useByHash == true)
+              os << "by-hash ";
+           std::copy(types.begin(), types.end()-1, std::ostream_iterator<std::string>(os, " "));
+           os << *types.rbegin();
+           Target->Options["COMPRESSIONTYPES"] = os.str();
+        }
+        else
+           Target->Options["COMPRESSIONTYPES"].clear();
+
+        std::string filename = GetExistingFilename(GetFinalFileNameFromURI(Target->URI));
+        if (filename.empty() == false)
+        {
+           // if the Release file is a hit and we have an index it must be the current one
+           if (TransactionManager->IMSHit == true)
+              ;
+           else if (TransactionManager->LastMetaIndexParser != NULL)
            {
+              // see if the file changed since the last Release file
+              // we use the uncompressed files as we might compress differently compared to the server,
+              // so the hashes might not match, even if they contain the same data.
               HashStringList const newFile = GetExpectedHashesFromFor(TransactionManager->MetaIndexParser, Target->MetaKey);
               HashStringList const oldFile = GetExpectedHashesFromFor(TransactionManager->LastMetaIndexParser, Target->MetaKey);
-              if (newFile == oldFile)
-              {
-                 // we have the file already, no point in trying to acquire it again
-                 new NoActionItem(Owner, *Target);
-                 continue;
-              }
+              if (newFile != oldFile)
+                 filename.clear();
            }
+           else
+              filename.clear();
         }
         else
            trypdiff = false; // no file to patch
 
+        if (filename.empty() == false)
+        {
+           new NoActionItem(Owner, *Target, filename);
+           std::string const idxfilename = GetFinalFileNameFromURI(Target->URI + ".diff/Index");
+           if (FileExists(idxfilename))
+              new NoActionItem(Owner, *Target, idxfilename);
+           continue;
+        }
+
         // check if we have patches available
         trypdiff &= TransactionManager->MetaIndexParser->Exists(Target->MetaKey + ".diff/Index");
       }
-      // if we have no file to patch, no point in trying
-      trypdiff &= RealFileExists(GetFinalFileNameFromURI(Target->URI));
+      else
+      {
+        // if we have no file to patch, no point in trying
+        trypdiff &= (GetExistingFilename(GetFinalFileNameFromURI(Target->URI)).empty() == false);
+      }
 
       // no point in patching from local sources
       if (trypdiff)
@@ -1065,7 +1251,7 @@ bool pkgAcqMetaBase::VerifyVendor(string const &Message)          /*{{{*/
         TransactionManager->LastMetaIndexParser->GetDate() > TransactionManager->MetaIndexParser->GetDate())
    {
       TransactionManager->IMSHit = true;
-      unlink(DestFile.c_str());
+      RemoveFile("VerifyVendor", DestFile);
       PartialFile = DestFile = GetFinalFilename();
       // load the 'old' file in the 'new' one instead of flipping pointers as
       // the new one isn't owned by us, while the old one is so cleanup would be confused.
@@ -1138,6 +1324,17 @@ string pkgAcqMetaClearSig::Custom600Headers() const
    return Header;
 }
                                                                        /*}}}*/
+bool pkgAcqMetaClearSig::VerifyDone(std::string const &Message,                /*{{{*/
+        pkgAcquire::MethodConfig const * const Cnf)
+{
+   Item::VerifyDone(Message, Cnf);
+
+   if (FileExists(DestFile) && !StartsWithGPGClearTextSignature(DestFile))
+      return RenameOnError(NotClearsigned);
+
+   return true;
+}
+                                                                       /*}}}*/
 // pkgAcqMetaClearSig::Done - We got a file                            /*{{{*/
 void pkgAcqMetaClearSig::Done(std::string const &Message,
                               HashStringList const &Hashes,
@@ -1145,17 +1342,6 @@ void pkgAcqMetaClearSig::Done(std::string const &Message,
 {
    Item::Done(Message, Hashes, Cnf);
 
-   // if we expect a ClearTextSignature (InRelease), ensure that
-   // this is what we get and if not fail to queue a 
-   // Release/Release.gpg, see #346386
-   if (FileExists(DestFile) && !StartsWithGPGClearTextSignature(DestFile))
-   {
-      pkgAcquire::Item::Failed(Message, Cnf);
-      RenameOnError(NotClearsigned);
-      TransactionManager->AbortTransaction();
-      return;
-   }
-
    if(AuthPass == false)
    {
       if(CheckDownloadDone(this, Message, Hashes) == true)
@@ -1186,6 +1372,16 @@ void pkgAcqMetaClearSig::Failed(string const &Message,pkgAcquire::MethodConfig c
 
    if (AuthPass == false)
    {
+      if (Status == StatAuthError || Status == StatTransientNetworkError)
+      {
+        // if we expected a ClearTextSignature (InRelease) but got a network
+        // error or got a file, but it wasn't valid, we end up here (see VerifyDone).
+        // As these is usually called by web-portals we do not try Release/Release.gpg
+        // as this is gonna fail anyway and instead abort our try (LP#346386)
+        TransactionManager->AbortTransaction();
+        return;
+      }
+
       // Queue the 'old' InRelease file for removal if we try Release.gpg
       // as otherwise the file will stay around and gives a false-auth
       // impression (CVE-2012-0214)
@@ -1199,14 +1395,10 @@ void pkgAcqMetaClearSig::Failed(string const &Message,pkgAcquire::MethodConfig c
       if(CheckStopAuthentication(this, Message))
          return;
 
-      _error->Warning(_("The data from '%s' is not signed. Packages "
-                        "from that repository can not be authenticated."),
-                      ClearsignedTarget.Description.c_str());
-
       // No Release file was present, or verification failed, so fall
       // back to queueing Packages files without verification
-      // only allow going further if the users explicitely wants it
-      if(AllowInsecureRepositories(TransactionManager->MetaIndexParser, TransactionManager, this) == true)
+      // only allow going further if the user explicitly wants it
+      if(AllowInsecureRepositories(_("The repository '%s' is not signed."), ClearsignedTarget.Description, TransactionManager->MetaIndexParser, TransactionManager, this) == true)
       {
         Status = StatDone;
 
@@ -1301,14 +1493,10 @@ void pkgAcqMetaIndex::Failed(string const &Message,
    pkgAcquire::Item::Failed(Message, Cnf);
    Status = StatDone;
 
-   _error->Warning(_("The repository '%s' does not have a Release file. "
-                     "This is deprecated, please contact the owner of the "
-                     "repository."), Target.Description.c_str());
-
    // No Release file was present so fall
    // back to queueing Packages files without verification
-   // only allow going further if the users explicitely wants it
-   if(AllowInsecureRepositories(TransactionManager->MetaIndexParser, TransactionManager, this) == true)
+   // only allow going further if the user explicitly wants it
+   if(AllowInsecureRepositories(_("The repository '%s' does not have a Release file."), Target.Description, TransactionManager->MetaIndexParser, TransactionManager, this) == true)
    {
       // ensure old Release files are removed
       TransactionManager->TransactionStageRemoval(this, GetFinalFilename());
@@ -1346,7 +1534,7 @@ pkgAcqMetaSig::pkgAcqMetaSig(pkgAcquire * const Owner,
    // remove any partial downloaded sig-file in partial/.
    // it may confuse proxies and is too small to warrant a
    // partial download anyway
-   unlink(DestFile.c_str());
+   RemoveFile("pkgAcqMetaSig", DestFile);
 
    // set the TransactionManager
    if(_config->FindB("Debug::Acquire::Transaction", false) == true)
@@ -1446,7 +1634,7 @@ void pkgAcqMetaSig::Failed(string const &Message,pkgAcquire::MethodConfig const
                            "given to override it."));
          Status = StatDone;
       } else {
-         _error->Error("%s", downgrade_msg.c_str());
+        MessageInsecureRepository(true, downgrade_msg);
         if (TransactionManager->IMSHit == false)
            Rename(MetaIndex->DestFile, MetaIndex->DestFile + ".FAILED");
         Item::Failed("Message: " + downgrade_msg, Cnf);
@@ -1454,16 +1642,12 @@ void pkgAcqMetaSig::Failed(string const &Message,pkgAcquire::MethodConfig const
          return;
       }
    }
-   else
-      _error->Warning(_("The data from '%s' is not signed. Packages "
-              "from that repository can not be authenticated."),
-           MetaIndex->Target.Description.c_str());
 
    // ensures that a Release.gpg file in the lists/ is removed by the transaction
    TransactionManager->TransactionStageRemoval(this, DestFile);
 
-   // only allow going further if the users explicitely wants it
-   if(AllowInsecureRepositories(TransactionManager->MetaIndexParser, TransactionManager, this) == true)
+   // only allow going further if the user explicitly wants it
+   if (AllowInsecureRepositories(_("The repository '%s' is not signed."), MetaIndex->Target.Description, TransactionManager->MetaIndexParser, TransactionManager, this) == true)
    {
       if (RealFileExists(FinalReleasegpg) || RealFileExists(FinalInRelease))
       {
@@ -1491,10 +1675,11 @@ void pkgAcqMetaSig::Failed(string const &Message,pkgAcquire::MethodConfig const
 
       // we parse the indexes here because at this point the user wanted
       // a repository that may potentially harm him
-      if (TransactionManager->MetaIndexParser->Load(MetaIndex->DestFile, &ErrorText) == false || MetaIndex->VerifyVendor(Message) == false)
+      bool const GoodLoad = TransactionManager->MetaIndexParser->Load(MetaIndex->DestFile, &ErrorText);
+      if (MetaIndex->VerifyVendor(Message) == false)
         /* expired Release files are still a problem you need extra force for */;
       else
-        MetaIndex->QueueIndexes(true);
+        MetaIndex->QueueIndexes(GoodLoad);
 
       TransactionManager->TransactionStageCopy(MetaIndex, MetaIndex->DestFile, MetaIndex->GetFinalFilename());
    }
@@ -1552,6 +1737,9 @@ pkgAcqDiffIndex::pkgAcqDiffIndex(pkgAcquire * const Owner,
 /* The only header we use is the last-modified header. */
 string pkgAcqDiffIndex::Custom600Headers() const
 {
+   if (TransactionManager->LastMetaIndexParser != NULL)
+      return "\nIndex-File: true";
+
    string const Final = GetFinalFilename();
 
    if(Debug)
@@ -1581,7 +1769,7 @@ bool pkgAcqDiffIndex::ParseDiffIndex(string const &IndexDiffFile) /*{{{*/
 
    FileFd Fd(IndexDiffFile,FileFd::ReadOnly);
    pkgTagFile TF(&Fd);
-   if (_error->PendingError() == true)
+   if (Fd.IsOpen() == false || Fd.Failed())
       return false;
 
    pkgTagSection Tags;
@@ -1636,7 +1824,7 @@ bool pkgAcqDiffIndex::ParseDiffIndex(string const &IndexDiffFile) /*{{{*/
       LocalHashes = GetExpectedHashesFromFor(TransactionManager->LastMetaIndexParser, Target.MetaKey);
    if (LocalHashes.usable() == false)
    {
-      FileFd fd(CurrentPackagesFile, FileFd::ReadOnly);
+      FileFd fd(CurrentPackagesFile, FileFd::ReadOnly, FileFd::Auto);
       Hashes LocalHashesCalc(ServerHashes);
       LocalHashesCalc.AddFD(fd);
       LocalHashes = LocalHashesCalc.GetHashStringList();
@@ -1655,10 +1843,18 @@ bool pkgAcqDiffIndex::ParseDiffIndex(string const &IndexDiffFile)       /*{{{*/
       std::clog << "Server-Current: " << ServerHashes.find(NULL)->toStr() << " and we start at "
         << CurrentPackagesFile << " " << LocalHashes.FileSize() << " " << LocalHashes.find(NULL)->toStr() << std::endl;
 
+   // historically, older hashes have more info than newer ones, so start
+   // collecting with older ones first to avoid implementing complicated
+   // information merging techniques… a failure is after all always
+   // recoverable with a complete file and hashes aren't changed that often.
+   std::vector<char const *> types;
+   for (char const * const * type = HashString::SupportedHashes(); *type != NULL; ++type)
+      types.push_back(*type);
+
    // parse all of (provided) history
    vector<DiffInfo> available_patches;
    bool firstAcceptedHashes = true;
-   for (char const * const * type = HashString::SupportedHashes(); *type != NULL; ++type)
+   for (auto type = types.crbegin(); type != types.crend(); ++type)
    {
       if (LocalHashes.find(*type) == NULL)
         continue;
@@ -1716,7 +1912,7 @@ bool pkgAcqDiffIndex::ParseDiffIndex(string const &IndexDiffFile) /*{{{*/
       return false;
    }
 
-   for (char const * const * type = HashString::SupportedHashes(); *type != NULL; ++type)
+   for (auto type = types.crbegin(); type != types.crend(); ++type)
    {
       if (LocalHashes.find(*type) == NULL)
         continue;
@@ -1756,7 +1952,7 @@ bool pkgAcqDiffIndex::ParseDiffIndex(string const &IndexDiffFile) /*{{{*/
       }
    }
 
-   for (char const * const * type = HashString::SupportedHashes(); *type != NULL; ++type)
+   for (auto type = types.crbegin(); type != types.crend(); ++type)
    {
       std::string tagname = *type;
       tagname.append("-Download");
@@ -1861,6 +2057,28 @@ bool pkgAcqDiffIndex::ParseDiffIndex(string const &IndexDiffFile)        /*{{{*/
       pdiff_merge = (precedence != "merged");
    }
 
+   // clean the plate
+   {
+      std::string const PartialFile = GetPartialFileNameFromURI(Target.URI);
+      std::vector<std::string> exts = APT::Configuration::getCompressorExtensions();
+      for (auto const &ext : exts)
+      {
+        std::string const Partial = PartialFile + ext;
+        if (FileExists(Partial))
+           RemoveFile("PDiffs-Bootstrap", Partial);
+      }
+      std::string const Final = GetExistingFilename(CurrentPackagesFile);
+      if (unlikely(Final.empty())) // because we wouldn't be called in such a case
+        return false;
+      std::string const Ext = Final.substr(CurrentPackagesFile.length());
+      std::string const Partial = PartialFile + Ext;
+      if (symlink(Final.c_str(), Partial.c_str()) != 0)
+      {
+        std::clog << "Bootstrap-linking for patching " << CurrentPackagesFile << " by linking " << Final << " to " << Partial << " failed!" << std::endl;
+        return false;
+      }
+   }
+
    if (pdiff_merge == false)
       new pkgAcqIndexDiffs(Owner, TransactionManager, Target, available_patches);
    else
@@ -1939,7 +2157,7 @@ pkgAcqIndexDiffs::pkgAcqIndexDiffs(pkgAcquire * const Owner,
    : pkgAcqBaseIndex(Owner, TransactionManager, Target), d(NULL),
      available_patches(diffs)
 {
-   DestFile = GetPartialFileNameFromURI(Target.URI);
+   DestFile = GetKeepCompressedFileName(GetPartialFileNameFromURI(Target.URI), Target);
 
    Debug = _config->FindB("Debug::pkgAcquire::Diffs",false);
 
@@ -1950,23 +2168,11 @@ pkgAcqIndexDiffs::pkgAcqIndexDiffs(pkgAcquire * const Owner,
    if(available_patches.empty() == true)
    {
       // we are done (yeah!), check hashes against the final file
-      DestFile = GetFinalFileNameFromURI(Target.URI);
+      DestFile = GetKeepCompressedFileName(GetFinalFileNameFromURI(Target.URI), Target);
       Finish(true);
    }
    else
    {
-      // patching needs to be bootstrapped with the 'old' version
-      std::string const PartialFile = GetPartialFileNameFromURI(Target.URI);
-      if (RealFileExists(PartialFile) == false)
-      {
-        if (symlink(GetFinalFilename().c_str(), PartialFile.c_str()) != 0)
-        {
-           Failed("Link creation of " + PartialFile + " to " + GetFinalFilename() + " failed", NULL);
-           return;
-        }
-      }
-
-      // get the next diff
       State = StateFetchDiff;
       QueueNextDiff();
    }
@@ -1977,14 +2183,17 @@ void pkgAcqIndexDiffs::Failed(string const &Message,pkgAcquire::MethodConfig con
    Item::Failed(Message,Cnf);
    Status = StatDone;
 
+   DestFile = GetKeepCompressedFileName(GetPartialFileNameFromURI(Target.URI), Target);
    if(Debug)
       std::clog << "pkgAcqIndexDiffs failed: " << Desc.URI << " with " << Message << std::endl
-               << "Falling back to normal index file acquire" << std::endl;
-   DestFile = GetPartialFileNameFromURI(Target.URI);
+               << "Falling back to normal index file acquire " << std::endl;
    RenameOnError(PDiffError);
    std::string const patchname = GetDiffsPatchFileName(DestFile);
    if (RealFileExists(patchname))
-      rename(patchname.c_str(), std::string(patchname + ".FAILED").c_str());
+      Rename(patchname, patchname + ".FAILED");
+   std::string const UnpatchedFile = GetExistingFilename(GetPartialFileNameFromURI(Target.URI));
+   if (UnpatchedFile.empty() == false && FileExists(UnpatchedFile))
+      Rename(UnpatchedFile, UnpatchedFile + ".FAILED");
    new pkgAcqIndex(Owner, TransactionManager, Target);
    Finish();
 }
@@ -2001,7 +2210,8 @@ void pkgAcqIndexDiffs::Finish(bool allDone)
    // the file will be cleaned
    if(allDone)
    {
-      TransactionManager->TransactionStageCopy(this, DestFile, GetFinalFilename());
+      std::string const Final = GetKeepCompressedFileName(GetFinalFilename(), Target);
+      TransactionManager->TransactionStageCopy(this, DestFile, Final);
 
       // this is for the "real" finish
       Complete = true;
@@ -2011,6 +2221,8 @@ void pkgAcqIndexDiffs::Finish(bool allDone)
         std::clog << "\n\nallDone: " << DestFile << "\n" << std::endl;
       return;
    }
+   else
+      DestFile.clear();
 
    if(Debug)
       std::clog << "Finishing: " << Desc.URI << std::endl;
@@ -2023,30 +2235,28 @@ void pkgAcqIndexDiffs::Finish(bool allDone)
 bool pkgAcqIndexDiffs::QueueNextDiff()                                 /*{{{*/
 {
    // calc sha1 of the just patched file
-   std::string const FinalFile = GetPartialFileNameFromURI(Target.URI);
-
-   if(!FileExists(FinalFile))
+   std::string const PartialFile = GetExistingFilename(GetPartialFileNameFromURI(Target.URI));
+   if(unlikely(PartialFile.empty()))
    {
-      Failed("Message: No FinalFile " + FinalFile + " available", NULL);
+      Failed("Message: The file " + GetPartialFileNameFromURI(Target.URI) + " isn't available", NULL);
       return false;
    }
 
-   FileFd fd(FinalFile, FileFd::ReadOnly);
+   FileFd fd(PartialFile, FileFd::ReadOnly, FileFd::Extension);
    Hashes LocalHashesCalc;
    LocalHashesCalc.AddFD(fd);
    HashStringList const LocalHashes = LocalHashesCalc.GetHashStringList();
 
    if(Debug)
-      std::clog << "QueueNextDiff: " << FinalFile << " (" << LocalHashes.find(NULL)->toStr() << ")" << std::endl;
+      std::clog << "QueueNextDiff: " << PartialFile << " (" << LocalHashes.find(NULL)->toStr() << ")" << std::endl;
 
    HashStringList const TargetFileHashes = GetExpectedHashesFor(Target.MetaKey);
    if (unlikely(LocalHashes.usable() == false || TargetFileHashes.usable() == false))
    {
-      Failed("Local/Expected hashes are not usable", NULL);
+      Failed("Local/Expected hashes are not usable for " + PartialFile, NULL);
       return false;
    }
 
-
    // final file reached before all patches are applied
    if(LocalHashes == TargetFileHashes)
    {
@@ -2056,26 +2266,22 @@ bool pkgAcqIndexDiffs::QueueNextDiff()                                  /*{{{*/
 
    // remove all patches until the next matching patch is found
    // this requires the Index file to be ordered
-   for(vector<DiffInfo>::iterator I = available_patches.begin();
-       available_patches.empty() == false &&
-         I != available_patches.end() &&
-         I->result_hashes != LocalHashes;
-       ++I)
-   {
-      available_patches.erase(I);
-   }
+   available_patches.erase(available_patches.begin(),
+        std::find_if(available_patches.begin(), available_patches.end(), [&](DiffInfo const &I) {
+           return I.result_hashes == LocalHashes;
+           }));
 
    // error checking and falling back if no patch was found
    if(available_patches.empty() == true)
    {
-      Failed("No patches left to reach target", NULL);
+      Failed("No patches left to reach target for " + PartialFile, NULL);
       return false;
    }
 
    // queue the right diff
    Desc.URI = Target.URI + ".diff/" + available_patches[0].file + ".gz";
    Desc.Description = Description + " " + available_patches[0].file + string(".pdiff");
-   DestFile = GetPartialFileNameFromURI(Target.URI + ".diff/" + available_patches[0].file);
+   DestFile = GetKeepCompressedFileName(GetPartialFileNameFromURI(Target.URI + ".diff/" + available_patches[0].file), Target);
 
    if(Debug)
       std::clog << "pkgAcqIndexDiffs::QueueNextDiff(): " << Desc.URI << std::endl;
@@ -2088,55 +2294,51 @@ bool pkgAcqIndexDiffs::QueueNextDiff()                                  /*{{{*/
 void pkgAcqIndexDiffs::Done(string const &Message, HashStringList const &Hashes,       /*{{{*/
                            pkgAcquire::MethodConfig const * const Cnf)
 {
-   if(Debug)
+   if (Debug)
       std::clog << "pkgAcqIndexDiffs::Done(): " << Desc.URI << std::endl;
 
    Item::Done(Message, Hashes, Cnf);
 
-   std::string const FinalFile = GetPartialFileNameFromURI(Target.URI);
-   std::string const PatchFile = GetDiffsPatchFileName(FinalFile);
+   std::string const UncompressedUnpatchedFile = GetPartialFileNameFromURI(Target.URI);
+   std::string const UnpatchedFile = GetExistingFilename(UncompressedUnpatchedFile);
+   std::string const PatchFile = GetDiffsPatchFileName(UnpatchedFile);
+   std::string const PatchedFile = GetKeepCompressedFileName(UncompressedUnpatchedFile, Target);
 
-   // success in downloading a diff, enter ApplyDiff state
-   if(State == StateFetchDiff)
+   switch (State)
    {
-      Rename(DestFile, PatchFile);
-
-      if(Debug)
-        std::clog << "Sending to rred method: " << FinalFile << std::endl;
-
-      State = StateApplyDiff;
-      Local = true;
-      Desc.URI = "rred:" + FinalFile;
-      QueueURI(Desc);
-      SetActiveSubprocess("rred");
-      return;
-   }
-
-   // success in download/apply a diff, queue next (if needed)
-   if(State == StateApplyDiff)
-   {
-      // remove the just applied patch
-      available_patches.erase(available_patches.begin());
-      unlink(PatchFile.c_str());
-
-      // move into place
-      if(Debug)
-      {
-        std::clog << "Moving patched file in place: " << std::endl
-                  << DestFile << " -> " << FinalFile << std::endl;
-      }
-      Rename(DestFile,FinalFile);
-      chmod(FinalFile.c_str(),0644);
-
-      // see if there is more to download
-      if(available_patches.empty() == false) {
-        new pkgAcqIndexDiffs(Owner, TransactionManager, Target,
-                             available_patches);
-        return Finish();
-      } else 
-         // update
-         DestFile = FinalFile;
-        return Finish(true);
+      // success in downloading a diff, enter ApplyDiff state
+      case StateFetchDiff:
+        Rename(DestFile, PatchFile);
+        DestFile = GetKeepCompressedFileName(UncompressedUnpatchedFile + "-patched", Target);
+        if(Debug)
+           std::clog << "Sending to rred method: " << UnpatchedFile << std::endl;
+        State = StateApplyDiff;
+        Local = true;
+        Desc.URI = "rred:" + UnpatchedFile;
+        QueueURI(Desc);
+        SetActiveSubprocess("rred");
+        return;
+      // success in download/apply a diff, queue next (if needed)
+      case StateApplyDiff:
+        // remove the just applied patch and base file
+        available_patches.erase(available_patches.begin());
+        RemoveFile("pkgAcqIndexDiffs::Done", PatchFile);
+        RemoveFile("pkgAcqIndexDiffs::Done", UnpatchedFile);
+        if(Debug)
+           std::clog << "Moving patched file in place: " << std::endl
+              << DestFile << " -> " << PatchedFile << std::endl;
+        Rename(DestFile, PatchedFile);
+
+        // see if there is more to download
+        if(available_patches.empty() == false)
+        {
+           new pkgAcqIndexDiffs(Owner, TransactionManager, Target, available_patches);
+           Finish();
+        } else {
+           DestFile = PatchedFile;
+           Finish(true);
+        }
+        return;
    }
 }
                                                                        /*}}}*/
@@ -2168,11 +2370,9 @@ pkgAcqIndexMergeDiffs::pkgAcqIndexMergeDiffs(pkgAcquire * const Owner,
    Desc.Owner = this;
    Description = Target.Description;
    Desc.ShortDesc = Target.ShortDesc;
-
    Desc.URI = Target.URI + ".diff/" + patch.file + ".gz";
-   Desc.Description = Description + " " + patch.file + string(".pdiff");
-
-   DestFile = GetPartialFileNameFromURI(Target.URI + ".diff/" + patch.file);
+   Desc.Description = Description + " " + patch.file + ".pdiff";
+   DestFile = GetPartialFileNameFromURI(Desc.URI);
 
    if(Debug)
       std::clog << "pkgAcqIndexMergeDiffs: " << Desc.URI << std::endl;
@@ -2199,11 +2399,14 @@ void pkgAcqIndexMergeDiffs::Failed(string const &Message,pkgAcquire::MethodConfi
    State = StateErrorDiff;
    if (Debug)
       std::clog << "Falling back to normal index file acquire" << std::endl;
-   DestFile = GetPartialFileNameFromURI(Target.URI);
    RenameOnError(PDiffError);
-   std::string const patchname = GetMergeDiffsPatchFileName(DestFile, patch.file);
+   std::string const patchname = GetPartialFileNameFromURI(Desc.URI);
    if (RealFileExists(patchname))
-      rename(patchname.c_str(), std::string(patchname + ".FAILED").c_str());
+      Rename(patchname, patchname + ".FAILED");
+   std::string const UnpatchedFile = GetExistingFilename(GetPartialFileNameFromURI(Target.URI));
+   if (UnpatchedFile.empty() == false && FileExists(UnpatchedFile))
+      Rename(UnpatchedFile, UnpatchedFile + ".FAILED");
+   DestFile.clear();
    new pkgAcqIndex(Owner, TransactionManager, Target);
 }
                                                                        /*}}}*/
@@ -2215,67 +2418,58 @@ void pkgAcqIndexMergeDiffs::Done(string const &Message, HashStringList const &Ha
 
    Item::Done(Message, Hashes, Cnf);
 
-   string const FinalFile = GetPartialFileNameFromURI(Target.URI);
-   if (State == StateFetchDiff)
-   {
-      Rename(DestFile, GetMergeDiffsPatchFileName(FinalFile, patch.file));
-
-      // check if this is the last completed diff
-      State = StateDoneDiff;
-      for (std::vector<pkgAcqIndexMergeDiffs *>::const_iterator I = allPatches->begin();
-           I != allPatches->end(); ++I)
-        if ((*I)->State != StateDoneDiff)
-        {
-           if(Debug)
-              std::clog << "Not the last done diff in the batch: " << Desc.URI << std::endl;
-           return;
-        }
-
-      // this is the last completed diff, so we are ready to apply now
-      State = StateApplyDiff;
-
-      // patching needs to be bootstrapped with the 'old' version
-      if (symlink(GetFinalFilename().c_str(), FinalFile.c_str()) != 0)
-      {
-        Failed("Link creation of " + FinalFile + " to " + GetFinalFilename() + " failed", NULL);
-        return;
-      }
-
-      if(Debug)
-        std::clog << "Sending to rred method: " << FinalFile << std::endl;
+   std::string const UncompressedUnpatchedFile = GetPartialFileNameFromURI(Target.URI);
+   std::string const UnpatchedFile = GetExistingFilename(UncompressedUnpatchedFile);
+   std::string const PatchFile = GetMergeDiffsPatchFileName(UnpatchedFile, patch.file);
+   std::string const PatchedFile = GetKeepCompressedFileName(UncompressedUnpatchedFile, Target);
 
-      Local = true;
-      Desc.URI = "rred:" + FinalFile;
-      QueueURI(Desc);
-      SetActiveSubprocess("rred");
-      return;
-   }
-   // success in download/apply all diffs, clean up
-   else if (State == StateApplyDiff)
+   switch (State)
    {
-      // move the result into place
-      std::string const Final = GetFinalFilename();
-      if(Debug)
-        std::clog << "Queue patched file in place: " << std::endl
-                  << DestFile << " -> " << Final << std::endl;
+      case StateFetchDiff:
+        Rename(DestFile, PatchFile);
 
-      // queue for copy by the transaction manager
-      TransactionManager->TransactionStageCopy(this, DestFile, Final);
-
-      // ensure the ed's are gone regardless of list-cleanup
-      for (std::vector<pkgAcqIndexMergeDiffs *>::const_iterator I = allPatches->begin();
-           I != allPatches->end(); ++I)
-      {
-        std::string const PartialFile = GetPartialFileNameFromURI(Target.URI);
-        std::string const patch = GetMergeDiffsPatchFileName(PartialFile, (*I)->patch.file);
-        unlink(patch.c_str());
-      }
-      unlink(FinalFile.c_str());
-
-      // all set and done
-      Complete = true;
-      if(Debug)
-        std::clog << "allDone: " << DestFile << "\n" << std::endl;
+        // check if this is the last completed diff
+        State = StateDoneDiff;
+        for (std::vector<pkgAcqIndexMergeDiffs *>::const_iterator I = allPatches->begin();
+              I != allPatches->end(); ++I)
+           if ((*I)->State != StateDoneDiff)
+           {
+              if(Debug)
+                 std::clog << "Not the last done diff in the batch: " << Desc.URI << std::endl;
+              return;
+           }
+        // this is the last completed diff, so we are ready to apply now
+        DestFile = GetKeepCompressedFileName(UncompressedUnpatchedFile + "-patched", Target);
+        if(Debug)
+           std::clog << "Sending to rred method: " << UnpatchedFile << std::endl;
+        State = StateApplyDiff;
+        Local = true;
+        Desc.URI = "rred:" + UnpatchedFile;
+        QueueURI(Desc);
+        SetActiveSubprocess("rred");
+        return;
+      case StateApplyDiff:
+        // success in download & apply all diffs, finialize and clean up
+        if(Debug)
+           std::clog << "Queue patched file in place: " << std::endl
+              << DestFile << " -> " << PatchedFile << std::endl;
+
+        // queue for copy by the transaction manager
+        TransactionManager->TransactionStageCopy(this, DestFile, GetKeepCompressedFileName(GetFinalFilename(), Target));
+
+        // ensure the ed's are gone regardless of list-cleanup
+        for (std::vector<pkgAcqIndexMergeDiffs *>::const_iterator I = allPatches->begin();
+              I != allPatches->end(); ++I)
+           RemoveFile("pkgAcqIndexMergeDiffs::Done", GetMergeDiffsPatchFileName(UnpatchedFile, (*I)->patch.file));
+        RemoveFile("pkgAcqIndexMergeDiffs::Done", UnpatchedFile);
+
+        // all set and done
+        Complete = true;
+        if(Debug)
+           std::clog << "allDone: " << DestFile << "\n" << std::endl;
+        return;
+      case StateDoneDiff: _error->Fatal("Done called for %s which is in an invalid Done state", PatchFile.c_str()); break;
+      case StateErrorDiff: _error->Fatal("Done called for %s which is in an invalid Error state", PatchFile.c_str()); break;
    }
 }
                                                                        /*}}}*/
@@ -2303,10 +2497,9 @@ pkgAcqIndexMergeDiffs::~pkgAcqIndexMergeDiffs() {}
 pkgAcqIndex::pkgAcqIndex(pkgAcquire * const Owner,
                          pkgAcqMetaClearSig * const TransactionManager,
                          IndexTarget const &Target)
-   : pkgAcqBaseIndex(Owner, TransactionManager, Target), d(NULL), Stage(STAGE_DOWNLOAD)
+   : pkgAcqBaseIndex(Owner, TransactionManager, Target), d(NULL), Stage(STAGE_DOWNLOAD),
+   CompressionExtensions(Target.Option(IndexTarget::COMPRESSIONTYPES))
 {
-   // autoselect the compression method
-   AutoSelectCompression();
    Init(Target.URI, Target.Description, Target.ShortDesc);
 
    if(_config->FindB("Debug::Acquire::Transaction", false) == true)
@@ -2314,54 +2507,58 @@ pkgAcqIndex::pkgAcqIndex(pkgAcquire * const Owner,
                 << TransactionManager << std::endl;
 }
                                                                        /*}}}*/
-// AcqIndex::AutoSelectCompression - Select compression                        /*{{{*/
-void pkgAcqIndex::AutoSelectCompression()
+// AcqIndex::Init - defered Constructor                                        /*{{{*/
+static void NextCompressionExtension(std::string &CurrentCompressionExtension, std::string &CompressionExtensions, bool const preview)
 {
-   std::vector<std::string> types = APT::Configuration::getCompressionTypes();
-   CompressionExtensions = "";
-   if (TransactionManager->MetaIndexParser != NULL && TransactionManager->MetaIndexParser->Exists(Target.MetaKey))
+   size_t const nextExt = CompressionExtensions.find(' ');
+   if (nextExt == std::string::npos)
    {
-      for (std::vector<std::string>::const_iterator t = types.begin();
-           t != types.end(); ++t)
-      {
-         std::string CompressedMetaKey = string(Target.MetaKey).append(".").append(*t);
-         if (*t == "uncompressed" ||
-             TransactionManager->MetaIndexParser->Exists(CompressedMetaKey) == true)
-            CompressionExtensions.append(*t).append(" ");
-      }
+      CurrentCompressionExtension = CompressionExtensions;
+      if (preview == false)
+        CompressionExtensions.clear();
    }
    else
    {
-      for (std::vector<std::string>::const_iterator t = types.begin(); t != types.end(); ++t)
-        CompressionExtensions.append(*t).append(" ");
+      CurrentCompressionExtension = CompressionExtensions.substr(0, nextExt);
+      if (preview == false)
+        CompressionExtensions = CompressionExtensions.substr(nextExt+1);
    }
-   if (CompressionExtensions.empty() == false)
-      CompressionExtensions.erase(CompressionExtensions.end()-1);
 }
-                                                                       /*}}}*/
-// AcqIndex::Init - defered Constructor                                        /*{{{*/
 void pkgAcqIndex::Init(string const &URI, string const &URIDesc,
                        string const &ShortDesc)
 {
    Stage = STAGE_DOWNLOAD;
 
    DestFile = GetPartialFileNameFromURI(URI);
+   NextCompressionExtension(CurrentCompressionExtension, CompressionExtensions, false);
 
-   size_t const nextExt = CompressionExtensions.find(' ');
-   if (nextExt == std::string::npos)
+   if (CurrentCompressionExtension == "uncompressed")
    {
-      CurrentCompressionExtension = CompressionExtensions;
-      CompressionExtensions.clear();
+      Desc.URI = URI;
    }
-   else
+   else if (CurrentCompressionExtension == "by-hash")
    {
-      CurrentCompressionExtension = CompressionExtensions.substr(0, nextExt);
-      CompressionExtensions = CompressionExtensions.substr(nextExt+1);
-   }
+      NextCompressionExtension(CurrentCompressionExtension, CompressionExtensions, true);
+      if(unlikely(TransactionManager->MetaIndexParser == NULL || CurrentCompressionExtension.empty()))
+        return;
+      if (CurrentCompressionExtension != "uncompressed")
+      {
+        Desc.URI = URI + '.' + CurrentCompressionExtension;
+        DestFile = DestFile + '.' + CurrentCompressionExtension;
+      }
 
-   if (CurrentCompressionExtension == "uncompressed")
-   {
-      Desc.URI = URI;
+      HashStringList const Hashes = GetExpectedHashes();
+      HashString const * const TargetHash = Hashes.find(NULL);
+      if (unlikely(TargetHash == nullptr))
+        return;
+      std::string const ByHash = "/by-hash/" + TargetHash->HashType() + "/" + TargetHash->HashValue();
+      size_t const trailing_slash = Desc.URI.find_last_of("/");
+      if (unlikely(trailing_slash == std::string::npos))
+        return;
+      Desc.URI = Desc.URI.replace(
+           trailing_slash,
+           Desc.URI.substr(trailing_slash+1).size()+1,
+           ByHash);
    }
    else if (unlikely(CurrentCompressionExtension.empty()))
       return;
@@ -2371,8 +2568,6 @@ void pkgAcqIndex::Init(string const &URI, string const &URIDesc,
       DestFile = DestFile + '.' + CurrentCompressionExtension;
    }
 
-   if(TransactionManager->MetaIndexParser != NULL)
-      InitByHashIfNeeded();
 
    Desc.Description = URIDesc;
    Desc.Owner = this;
@@ -2381,47 +2576,22 @@ void pkgAcqIndex::Init(string const &URI, string const &URIDesc,
    QueueURI(Desc);
 }
                                                                        /*}}}*/
-// AcqIndex::AdjustForByHash - modify URI for by-hash support          /*{{{*/
-void pkgAcqIndex::InitByHashIfNeeded()
-{
-   // TODO:
-   //  - (maybe?) add support for by-hash into the sources.list as flag
-   //  - make apt-ftparchive generate the hashes (and expire?)
-   std::string HostKnob = "APT::Acquire::" + ::URI(Desc.URI).Host + "::By-Hash";
-   if(_config->FindB("APT::Acquire::By-Hash", false) == true ||
-      _config->FindB(HostKnob, false) == true ||
-      TransactionManager->MetaIndexParser->GetSupportsAcquireByHash())
-   {
-      HashStringList const Hashes = GetExpectedHashes();
-      if(Hashes.usable())
-      {
-         // FIXME: should we really use the best hash here? or a fixed one?
-         HashString const * const TargetHash = Hashes.find("");
-         std::string const ByHash = "/by-hash/" + TargetHash->HashType() + "/" + TargetHash->HashValue();
-         size_t const trailing_slash = Desc.URI.find_last_of("/");
-         Desc.URI = Desc.URI.replace(
-            trailing_slash,
-            Desc.URI.substr(trailing_slash+1).size()+1,
-            ByHash);
-      } else {
-         _error->Warning(
-            "Fetching ByHash requested but can not find record for %s",
-            GetMetaKey().c_str());
-      }
-   }
-}
-                                                                       /*}}}*/
 // AcqIndex::Custom600Headers - Insert custom request headers          /*{{{*/
 // ---------------------------------------------------------------------
 /* The only header we use is the last-modified header. */
 string pkgAcqIndex::Custom600Headers() const
 {
-   string Final = GetFinalFilename();
 
    string msg = "\nIndex-File: true";
-   struct stat Buf;
-   if (stat(Final.c_str(),&Buf) == 0)
-      msg += "\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
+
+   if (TransactionManager->LastMetaIndexParser == NULL)
+   {
+      std::string const Final = GetFinalFilename();
+
+      struct stat Buf;
+      if (stat(Final.c_str(),&Buf) == 0)
+        msg += "\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
+   }
 
    if(Target.IsOptional)
       msg += "\nFail-Ignore: true";
@@ -2496,29 +2666,47 @@ void pkgAcqIndex::StageDownloadDone(string const &Message, HashStringList const
    Complete = true;
 
    // Handle the unzipd case
-   string FileName = LookupTag(Message,"Alt-Filename");
+   std::string FileName = LookupTag(Message,"Alt-Filename");
    if (FileName.empty() == false)
    {
       Stage = STAGE_DECOMPRESS_AND_VERIFY;
       Local = true;
-      DestFile += ".decomp";
+      if (CurrentCompressionExtension != "uncompressed")
+        DestFile.erase(DestFile.length() - (CurrentCompressionExtension.length() + 1));
       Desc.URI = "copy:" + FileName;
       QueueURI(Desc);
       SetActiveSubprocess("copy");
       return;
    }
-
    FileName = LookupTag(Message,"Filename");
-   if (FileName.empty() == true)
-   {
-      Status = StatError;
-      ErrorText = "Method gave a blank filename";
-   }
 
    // Methods like e.g. "file:" will give us a (compressed) FileName that is
    // not the "DestFile" we set, in this case we uncompress from the local file
    if (FileName != DestFile && RealFileExists(DestFile) == false)
+   {
       Local = true;
+      if (Target.KeepCompressed == true)
+      {
+        // but if we don't keep the uncompress we copy the compressed file first
+        Stage = STAGE_DOWNLOAD;
+        Desc.URI = "copy:" + FileName;
+        QueueURI(Desc);
+        SetActiveSubprocess("copy");
+        return;
+      }
+      else
+      {
+        // symlinking ensures that the filename can be used for compression detection
+        // that is e.g. needed for by-hash over file
+        if (symlink(FileName.c_str(),DestFile.c_str()) != 0)
+           _error->WarningE("pkgAcqIndex::StageDownloadDone", "Symlinking file %s to %s failed", FileName.c_str(), DestFile.c_str());
+        else
+        {
+           EraseFileName = DestFile;
+           FileName = DestFile;
+        }
+      }
+   }
    else
       EraseFileName = FileName;
 
@@ -2532,33 +2720,22 @@ void pkgAcqIndex::StageDownloadDone(string const &Message, HashStringList const
       return;
    }
 
-   // If we want compressed indexes, just copy in place for hash verification
+   string decompProg = "store";
    if (Target.KeepCompressed == true)
    {
-      DestFile = GetPartialFileNameFromURI(Target.URI + '.' + CurrentCompressionExtension);
-      EraseFileName = "";
-      Stage = STAGE_DECOMPRESS_AND_VERIFY;
-      Desc.URI = "copy:" + FileName;
-      QueueURI(Desc);
-      SetActiveSubprocess("copy");
-      return;
-    }
-
-   // get the binary name for your used compression type
-   string decompProg;
-   if(CurrentCompressionExtension == "uncompressed")
-      decompProg = "copy";
+      DestFile = "/dev/null";
+      EraseFileName.clear();
+   }
    else
-      decompProg = _config->Find(string("Acquire::CompressionTypes::").append(CurrentCompressionExtension),"");
-   if(decompProg.empty() == true)
    {
-      _error->Error("Unsupported extension: %s", CurrentCompressionExtension.c_str());
-      return;
+      if (CurrentCompressionExtension == "uncompressed")
+        decompProg = "copy";
+      else
+        DestFile.erase(DestFile.length() - (CurrentCompressionExtension.length() + 1));
    }
 
    // queue uri for the next stage
    Stage = STAGE_DECOMPRESS_AND_VERIFY;
-   DestFile += ".decomp";
    Desc.URI = decompProg + ":" + FileName;
    QueueURI(Desc);
    SetActiveSubprocess(decompProg);
@@ -2569,6 +2746,9 @@ void pkgAcqIndex::StageDecompressDone(string const &,
                                       HashStringList const &,
                                       pkgAcquire::MethodConfig const * const)
 {
+   if (Target.KeepCompressed == true && DestFile == "/dev/null")
+      DestFile = GetPartialFileNameFromURI(Target.URI + '.' + CurrentCompressionExtension);
+
    // Done, queue for rename on transaction finished
    TransactionManager->TransactionStageCopy(this, DestFile, GetFinalFilename());
    return;
@@ -2723,7 +2903,7 @@ bool pkgAcqArchive::QueueNext()
         
         /* Hmm, we have a file and its size does not match, this means it is
            an old style mismatched arch */
-        unlink(FinalFile.c_str());
+        RemoveFile("pkgAcqArchive::QueueNext", FinalFile);
       }
 
       // Check it again using the new style output filenames
@@ -2742,7 +2922,7 @@ bool pkgAcqArchive::QueueNext()
         
         /* Hmm, we have a file and its size does not match, this shouldn't
            happen.. */
-        unlink(FinalFile.c_str());
+        RemoveFile("pkgAcqArchive::QueueNext", FinalFile);
       }
 
       DestFile = _config->FindDir("Dir::Cache::Archives") + "partial/" + flNotDir(StoreFilename);
@@ -2752,7 +2932,7 @@ bool pkgAcqArchive::QueueNext()
       {
         // Hmm, the partial file is too big, erase it
         if ((unsigned long long)Buf.st_size > Version->Size)
-           unlink(DestFile.c_str());
+           RemoveFile("pkgAcqArchive::QueueNext", DestFile);
         else
            PartialSize = Buf.st_size;
       }
@@ -2787,15 +2967,7 @@ void pkgAcqArchive::Done(string const &Message, HashStringList const &Hashes,
    Item::Done(Message, Hashes, Cfg);
 
    // Grab the output filename
-   string FileName = LookupTag(Message,"Filename");
-   if (FileName.empty() == true)
-   {
-      Status = StatError;
-      ErrorText = "Method gave a blank filename";
-      return;
-   }
-
-   // Reference filename
+   std::string const FileName = LookupTag(Message,"Filename");
    if (DestFile !=  FileName && RealFileExists(DestFile) == false)
    {
       StoreFilename = DestFile = FileName;
@@ -2917,7 +3089,8 @@ void pkgAcqChangelog::Init(std::string const &DestDir, std::string const &DestFi
 
    if (DestDir.empty())
    {
-      std::string const systemTemp = GetTempDir();
+      std::string const SandboxUser = _config->Find("APT::Sandbox::User");
+      std::string const systemTemp = GetTempDir(SandboxUser);
       char tmpname[100];
       snprintf(tmpname, sizeof(tmpname), "%s/apt-changelog-XXXXXX", systemTemp.c_str());
       if (NULL == mkdtemp(tmpname))
@@ -2927,6 +3100,9 @@ void pkgAcqChangelog::Init(std::string const &DestDir, std::string const &DestFi
         return;
       }
       DestFile = TemporaryDirectory = tmpname;
+
+      ChangeOwnerAndPermissionOfFile("Item::QueueURI", DestFile.c_str(),
+                                     SandboxUser.c_str(), "root", 0700);
    }
    else
       DestFile = DestDir;
@@ -3021,7 +3197,7 @@ std::string pkgAcqChangelog::URI(std::string const &Template,
         char const * const Component, char const * const SrcName,
         char const * const SrcVersion)
 {
-   if (Template.find("CHANGEPATH") == std::string::npos)
+   if (Template.find("@CHANGEPATH@") == std::string::npos)
       return "";
 
    // the path is: COMPONENT/SRC/SRCNAME/SRCNAME_SRCVER, e.g. main/a/apt/1.1 or contrib/liba/libapt/2.0
@@ -3033,7 +3209,7 @@ std::string pkgAcqChangelog::URI(std::string const &Template,
    if (Component != NULL && strlen(Component) != 0)
       path = std::string(Component) + "/" + path;
 
-   return SubstVar(Template, "CHANGEPATH", path);
+   return SubstVar(Template, "@CHANGEPATH@", path);
 }
                                                                        /*}}}*/
 // AcqChangelog::Failed - Failure handler                              /*{{{*/
@@ -3066,7 +3242,7 @@ pkgAcqChangelog::~pkgAcqChangelog()                                       /*{{{*/
 {
    if (TemporaryDirectory.empty() == false)
    {
-      unlink(DestFile.c_str());
+      RemoveFile("~pkgAcqChangelog", DestFile);
       rmdir(TemporaryDirectory.c_str());
    }
 }
@@ -3103,7 +3279,7 @@ pkgAcqFile::pkgAcqFile(pkgAcquire * const Owner,string const &URI, HashStringLis
    {
       // Hmm, the partial file is too big, erase it
       if ((Size > 0) && (unsigned long long)Buf.st_size > Size)
-        unlink(DestFile.c_str());
+        RemoveFile("pkgAcqFile", DestFile);
       else
         PartialSize = Buf.st_size;
    }
@@ -3117,14 +3293,7 @@ void pkgAcqFile::Done(string const &Message,HashStringList const &CalcHashes,
 {
    Item::Done(Message,CalcHashes,Cnf);
 
-   string FileName = LookupTag(Message,"Filename");
-   if (FileName.empty() == true)
-   {
-      Status = StatError;
-      ErrorText = "Method gave a blank filename";
-      return;
-   }
-
+   std::string const FileName = LookupTag(Message,"Filename");
    Complete = true;
 
    // The files timestamp matches
@@ -3148,7 +3317,7 @@ void pkgAcqFile::Done(string const &Message,HashStringList const &CalcHashes,
       if (lstat(DestFile.c_str(),&St) == 0)
       {
         if (S_ISLNK(St.st_mode) != 0)
-           unlink(DestFile.c_str());
+           RemoveFile("pkgAcqFile::Done", DestFile);
       }
 
       // Symlink the file
@@ -3157,7 +3326,7 @@ void pkgAcqFile::Done(string const &Message,HashStringList const &CalcHashes,
         _error->PushToStack();
         _error->Errno("pkgAcqFile::Done", "Symlinking file %s failed", DestFile.c_str());
         std::stringstream msg;
-        _error->DumpErrors(msg);
+        _error->DumpErrors(msg, GlobalError::DEBUG, false);
         _error->RevertToStack();
         ErrorText = msg.str();
         Status = StatError;