]> git.saurik.com Git - apt.git/blobdiff - apt-pkg/acquire-item.cc
improve CheckDropPrivsMustBeDisabled further
[apt.git] / apt-pkg / acquire-item.cc
index ec6ec6e84daf40349a5e383a695d20e158475c12..b6b6d8e48c38b96e845c0611f812b31e0ab9563e 100644 (file)
 #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/indexrecords.h>
+#include <apt-pkg/metaindex.h>
 #include <apt-pkg/acquire.h>
 #include <apt-pkg/hashes.h>
 #include <apt-pkg/indexfile.h>
 #include <apt-pkg/pkgcache.h>
 #include <apt-pkg/cacheiterators.h>
 #include <apt-pkg/pkgrecords.h>
+#include <apt-pkg/gpgv.h>
 
+#include <algorithm>
 #include <stddef.h>
 #include <stdlib.h>
 #include <string.h>
@@ -41,9 +42,9 @@
 #include <unistd.h>
 #include <errno.h>
 #include <string>
-#include <sstream>
 #include <stdio.h>
 #include <ctime>
+#include <sstream>
 
 #include <apti18n.h>
                                                                        /*}}}*/
@@ -79,25 +80,77 @@ static std::string GetFinalFileNameFromURI(std::string const &uri)  /*{{{*/
    return _config->FindDir("Dir::State::lists") + URItoFileName(uri);
 }
                                                                        /*}}}*/
-static std::string GetCompressedFileName(std::string const &URI, std::string const &Name, std::string const &Ext) /*{{{*/
+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")
       return Name;
 
    // do not reverify cdrom sources as apt-cdrom may rewrite the Packages
    // file when its doing the indexcopy
-   if (URI.substr(0,6) == "cdrom:")
+   if (Target.URI.substr(0,6) == "cdrom:")
       return Name;
 
    // adjust DestFile if its compressed on disk
-   if (_config->FindB("Acquire::GzipIndexes",false) == true)
+   if (Target.KeepCompressed == true)
       return Name + '.' + Ext;
    return Name;
 }
                                                                        /*}}}*/
-static bool AllowInsecureRepositories(indexRecords const * const MetaIndexParser, pkgAcqMetaBase * const TransactionManager, pkgAcquire::Item * const I) /*{{{*/
+static std::string GetMergeDiffsPatchFileName(std::string const &Final, std::string const &Patch)/*{{{*/
+{
+   // rred expects the patch as $FinalFile.ed.$patchname.gz
+   return Final + ".ed." + Patch + ".gz";
+}
+                                                                       /*}}}*/
+static std::string GetDiffsPatchFileName(std::string const &Final)     /*{{{*/
 {
-   if(MetaIndexParser->IsAlwaysTrusted() || _config->FindB("Acquire::AllowInsecureRepositories") == true)
+   // rred expects the patch as $FinalFile.ed
+   return Final + ".ed";
+}
+                                                                       /*}}}*/
+static bool BootstrapPDiffWith(std::string const &PartialFile, std::string const &FinalFile, IndexTarget const &Target)/*{{{*/
+{
+   // patching needs to be bootstrapped with the 'old' version
+   std::vector<std::string> types = VectorizeString(Target.Option(IndexTarget::COMPRESSIONTYPES), ' ');
+   auto typeItr = types.cbegin();
+   for (; typeItr != types.cend(); ++typeItr)
+   {
+      std::string Final = FinalFile;
+      if (*typeItr != "uncompressed")
+        Final.append(".").append(*typeItr);
+      if (RealFileExists(Final) == false)
+        continue;
+      std::string Partial = PartialFile;
+      if (*typeItr != "uncompressed")
+        Partial.append(".").append(*typeItr);
+      if (FileExists(Partial.c_str()) == true)
+        return true;
+      if (symlink(Final.c_str(), Partial.c_str()) != 0)
+        return false;
+      break;
+   }
+   return typeItr != types.cend();
+}
+                                                                       /*}}}*/
+
+static bool AllowInsecureRepositories(metaIndex const * const MetaIndexParser, pkgAcqMetaClearSig * const TransactionManager, pkgAcquire::Item * const I) /*{{{*/
+{
+   if(MetaIndexParser->GetTrusted() == metaIndex::TRI_YES || _config->FindB("Acquire::AllowInsecureRepositories") == true)
       return true;
 
    _error->Error(_("Use --allow-insecure-repositories to force the update"));
@@ -106,6 +159,16 @@ static bool AllowInsecureRepositories(indexRecords const * const MetaIndexParser
    return false;
 }
                                                                        /*}}}*/
+static HashStringList GetExpectedHashesFromFor(metaIndex * const Parser, std::string const &MetaKey)/*{{{*/
+{
+   if (Parser == NULL)
+      return HashStringList();
+   metaIndex::checkSum * const R = Parser->Lookup(MetaKey);
+   if (R == NULL)
+      return HashStringList();
+   return R->Hashes;
+}
+                                                                       /*}}}*/
 
 // all ::HashesRequired and ::GetExpectedHashes implementations                /*{{{*/
 /* ::GetExpectedHashes is abstract and has to be implemented by all subclasses.
@@ -120,7 +183,8 @@ APT_CONST bool pkgAcqTransactionItem::HashesRequired() const
       we can at least trust them for integrity of the download itself.
       Only repositories without a Release file can (obviously) not have
       hashes – and they are very uncommon and strongly discouraged */
-   return TransactionManager->MetaIndexParser != NULL;
+   return TransactionManager->MetaIndexParser != NULL &&
+      TransactionManager->MetaIndexParser->GetLoadedSuccessfully() != metaIndex::TRI_UNSET;
 }
 HashStringList pkgAcqTransactionItem::GetExpectedHashes() const
 {
@@ -139,14 +203,18 @@ HashStringList pkgAcqMetaBase::GetExpectedHashes() const
 
 APT_CONST bool pkgAcqIndexDiffs::HashesRequired() const
 {
-   /* FIXME: We have only hashes for uncompressed pdiffs.
-      rred uncompresses them on the fly while parsing.
-      In StateFetchDiff state we also uncompress on the fly for hash check.
-      Hashes are checked while searching for (next) patch to apply. */
+   /* We don't always have the diff of the downloaded pdiff file.
+      What we have for sure is hashes for the uncompressed file,
+      but rred uncompresses them on the fly while parsing, so not handled here.
+      Hashes are (also) checked while searching for (next) patch to apply. */
+   if (State == StateFetchDiff)
+      return available_patches[0].download_hashes.empty() == false;
    return false;
 }
 HashStringList pkgAcqIndexDiffs::GetExpectedHashes() const
 {
+   if (State == StateFetchDiff)
+      return available_patches[0].download_hashes;
    return HashStringList();
 }
 
@@ -155,12 +223,16 @@ APT_CONST bool pkgAcqIndexMergeDiffs::HashesRequired() const
    /* @see #pkgAcqIndexDiffs::HashesRequired, with the difference that
       we can check the rred result after all patches are applied as
       we know the expected result rather than potentially apply more patches */
+   if (State == StateFetchDiff)
+      return patch.download_hashes.empty() == false;
    return State == StateApplyDiff;
 }
 HashStringList pkgAcqIndexMergeDiffs::GetExpectedHashes() const
 {
-   if (State == StateApplyDiff)
-      return GetExpectedHashesFor(Target->MetaKey);
+   if (State == StateFetchDiff)
+      return patch.download_hashes;
+   else if (State == StateApplyDiff)
+      return GetExpectedHashesFor(Target.MetaKey);
    return HashStringList();
 }
 
@@ -235,20 +307,20 @@ std::string pkgAcqDiffIndex::GetFinalFilename() const
 }
 std::string pkgAcqIndex::GetFinalFilename() const
 {
-   std::string const FinalFile = GetFinalFileNameFromURI(Target->URI);
-   return GetCompressedFileName(Target->URI, FinalFile, CurrentCompressionExtension);
+   std::string const FinalFile = GetFinalFileNameFromURI(Target.URI);
+   return GetCompressedFileName(Target, FinalFile, CurrentCompressionExtension);
 }
 std::string pkgAcqMetaSig::GetFinalFilename() const
 {
-   return GetFinalFileNameFromURI(Target->URI);
+   return GetFinalFileNameFromURI(Target.URI);
 }
 std::string pkgAcqBaseIndex::GetFinalFilename() const
 {
-   return GetFinalFileNameFromURI(Target->URI);
+   return GetFinalFileNameFromURI(Target.URI);
 }
 std::string pkgAcqMetaBase::GetFinalFilename() const
 {
-   return GetFinalFileNameFromURI(DataTarget.URI);
+   return GetFinalFileNameFromURI(Target.URI);
 }
 std::string pkgAcqArchive::GetFinalFilename() const
 {
@@ -258,17 +330,17 @@ std::string pkgAcqArchive::GetFinalFilename() const
 // pkgAcqTransactionItem::GetMetaKey and specialisations for child classes     /*{{{*/
 std::string pkgAcqTransactionItem::GetMetaKey() const
 {
-   return Target->MetaKey;
+   return Target.MetaKey;
 }
 std::string pkgAcqIndex::GetMetaKey() const
 {
    if (Stage == STAGE_DECOMPRESS_AND_VERIFY || CurrentCompressionExtension == "uncompressed")
-      return Target->MetaKey;
-   return Target->MetaKey + "." + CurrentCompressionExtension;
+      return Target.MetaKey;
+   return Target.MetaKey + "." + CurrentCompressionExtension;
 }
 std::string pkgAcqDiffIndex::GetMetaKey() const
 {
-   return Target->MetaKey + ".diff/Index";
+   return Target.MetaKey + ".diff/Index";
 }
                                                                        /*}}}*/
 //pkgAcqTransactionItem::TransactionState and specialisations for child classes        /*{{{*/
@@ -342,7 +414,7 @@ bool pkgAcqDiffIndex::TransactionState(TransactionStates const state)
       case TransactionCommit:
         break;
       case TransactionAbort:
-        std::string const Partial = GetPartialFileNameFromURI(Target->URI);
+        std::string const Partial = GetPartialFileNameFromURI(Target.URI);
         unlink(Partial.c_str());
         break;
    }
@@ -351,11 +423,36 @@ bool pkgAcqDiffIndex::TransactionState(TransactionStates const state)
 }
                                                                        /*}}}*/
 
+class APT_HIDDEN NoActionItem : public pkgAcquire::Item                        /*{{{*/
+/* The sole purpose of this class is having an item which does nothing to
+   reach its done state to prevent cleanup deleting the mentioned file.
+   Handy in cases in which we know we have the file already, like IMS-Hits. */
+{
+   IndexTarget const Target;
+   public:
+   virtual std::string DescURI() const APT_OVERRIDE {return Target.URI;};
+   virtual HashStringList GetExpectedHashes()  const APT_OVERRIDE {return HashStringList();};
+
+   NoActionItem(pkgAcquire * const Owner, IndexTarget const &Target) :
+      pkgAcquire::Item(Owner), Target(Target)
+   {
+      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;
+   }
+};
+                                                                       /*}}}*/
+
 // Acquire::Item::Item - Constructor                                   /*{{{*/
 APT_IGNORE_DEPRECATED_PUSH
-pkgAcquire::Item::Item(pkgAcquire * const Owner) :
-   FileSize(0), PartialSize(0), Mode(0), Complete(false), Local(false),
-    QueueCounter(0), ExpectedAdditionalItems(0), Owner(Owner)
+pkgAcquire::Item::Item(pkgAcquire * const owner) :
+   FileSize(0), PartialSize(0), Mode(0), ID(0), Complete(false), Local(false),
+    QueueCounter(0), ExpectedAdditionalItems(0), Owner(owner), d(NULL)
 {
    Owner->Add(this);
    Status = StatIdle;
@@ -387,6 +484,11 @@ APT_PURE pkgAcquire * pkgAcquire::Item::GetOwner() const           /*{{{*/
    return Owner;
 }
                                                                        /*}}}*/
+APT_CONST pkgAcquire::ItemDesc &pkgAcquire::Item::GetItemDesc()                /*{{{*/
+{
+   return Desc;
+}
+                                                                       /*}}}*/
 APT_CONST bool pkgAcquire::Item::IsTrusted() const                     /*{{{*/
 {
    return false;
@@ -400,7 +502,6 @@ 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
@@ -458,24 +559,35 @@ 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..
-   string FileName = LookupTag(Message,"Filename");
-   UsedMirror = LookupTag(Message,"UsedMirror");
-   unsigned long long const downloadedSize = Hashes.FileSize();
-   if (downloadedSize != 0)
+   if (FileSize == 0)
    {
-      if (Complete == false && !Local && FileName == DestFile)
+      unsigned long long const downloadedSize = Hashes.FileSize();
+      if (downloadedSize != 0)
       {
-        if (Owner->Log != 0)
-           Owner->Log->Fetched(Hashes.FileSize(),atoi(LookupTag(Message,"Resume-Point","0").c_str()));
+        FileSize = downloadedSize;
       }
-
-      if (FileSize == 0)
-        FileSize= downloadedSize;
    }
    Status = StatDone;
    ErrorText = string();
@@ -535,8 +647,8 @@ 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
@@ -610,8 +722,8 @@ std::string pkgAcquire::Item::HashSum() const                               /*{{{*/
                                                                        /*}}}*/
 
 pkgAcqTransactionItem::pkgAcqTransactionItem(pkgAcquire * const Owner, /*{{{*/
-      pkgAcqMetaBase * const TransactionManager, IndexTarget const * const Target) :
-   pkgAcquire::Item(Owner), Target(Target), TransactionManager(TransactionManager)
+      pkgAcqMetaClearSig * const transactionManager, IndexTarget const &target) :
+   pkgAcquire::Item(Owner), d(NULL), Target(target), TransactionManager(transactionManager)
 {
    if (TransactionManager != this)
       TransactionManager->Add(this);
@@ -621,25 +733,19 @@ pkgAcqTransactionItem::~pkgAcqTransactionItem()                           /*{{{*/
 {
 }
                                                                        /*}}}*/
-HashStringList pkgAcqTransactionItem::GetExpectedHashesFor(std::string const MetaKey) const    /*{{{*/
+HashStringList pkgAcqTransactionItem::GetExpectedHashesFor(std::string const &MetaKey) const   /*{{{*/
 {
-   if (TransactionManager->MetaIndexParser == NULL)
-      return HashStringList();
-   indexRecords::checkSum * const R = TransactionManager->MetaIndexParser->Lookup(MetaKey);
-   if (R == NULL)
-      return HashStringList();
-   return R->Hashes;
+   return GetExpectedHashesFromFor(TransactionManager->MetaIndexParser, MetaKey);
 }
                                                                        /*}}}*/
 
 // AcqMetaBase - Constructor                                           /*{{{*/
 pkgAcqMetaBase::pkgAcqMetaBase(pkgAcquire * const Owner,
-      pkgAcqMetaBase * const TransactionManager,
-      std::vector<IndexTarget*> const * const IndexTargets,
-      IndexTarget const &DataTarget,
-      indexRecords * const MetaIndexParser)
-: pkgAcqTransactionItem(Owner, TransactionManager, NULL), DataTarget(DataTarget),
-   MetaIndexParser(MetaIndexParser), LastMetaIndexParser(NULL), IndexTargets(IndexTargets),
+      pkgAcqMetaClearSig * const TransactionManager,
+      std::vector<IndexTarget> const &IndexTargets,
+      IndexTarget const &DataTarget)
+: pkgAcqTransactionItem(Owner, TransactionManager, DataTarget), d(NULL),
+   IndexTargets(IndexTargets),
    AuthPass(false), IMSHit(false)
 {
 }
@@ -729,7 +835,7 @@ 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");
@@ -739,7 +845,7 @@ 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"),
@@ -762,7 +868,6 @@ string pkgAcqMetaBase::Custom600Headers() const
    Header += MaximumSize;
 
    string const FinalFile = GetFinalFilename();
-
    struct stat Buf;
    if (stat(FinalFile.c_str(),&Buf) == 0)
       Header += "\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
@@ -786,15 +891,8 @@ 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;
-   }
-
-   if (FileName != I->DestFile)
+   std::string const FileName = LookupTag(Message,"Filename");
+   if (FileName != I->DestFile && RealFileExists(I->DestFile) == false)
    {
       I->Local = true;
       I->Desc.URI = "copy:" + FileName;
@@ -855,26 +953,28 @@ bool pkgAcqMetaBase::CheckAuthDone(string const &Message)         /*{{{*/
       }
       if (RealFileExists(FinalInRelease) || RealFileExists(FinalRelease))
       {
-        TransactionManager->LastMetaIndexParser = new indexRecords;
-        _error->PushToStack();
-        if (RealFileExists(FinalInRelease))
-           TransactionManager->LastMetaIndexParser->Load(FinalInRelease);
-        else
-           TransactionManager->LastMetaIndexParser->Load(FinalRelease);
-        // its unlikely to happen, but if what we have is bad ignore it
-        if (_error->PendingError())
+        TransactionManager->LastMetaIndexParser = TransactionManager->MetaIndexParser->UnloadedClone();
+        if (TransactionManager->LastMetaIndexParser != NULL)
         {
-           delete TransactionManager->LastMetaIndexParser;
-           TransactionManager->LastMetaIndexParser = NULL;
+           _error->PushToStack();
+           if (RealFileExists(FinalInRelease))
+              TransactionManager->LastMetaIndexParser->Load(FinalInRelease, NULL);
+           else
+              TransactionManager->LastMetaIndexParser->Load(FinalRelease, NULL);
+           // its unlikely to happen, but if what we have is bad ignore it
+           if (_error->PendingError())
+           {
+              delete TransactionManager->LastMetaIndexParser;
+              TransactionManager->LastMetaIndexParser = NULL;
+           }
+           _error->RevertToStack();
         }
-        _error->RevertToStack();
       }
    }
 
-   if (TransactionManager->MetaIndexParser->Load(DestFile) == false)
+   if (TransactionManager->MetaIndexParser->Load(DestFile, &ErrorText) == false)
    {
       Status = StatAuthError;
-      ErrorText = TransactionManager->MetaIndexParser->ErrorText;
       return false;
    }
 
@@ -899,29 +999,113 @@ void pkgAcqMetaBase::QueueIndexes(bool const verify)                     /*{{{*/
    // at this point the real Items are loaded in the fetcher
    ExpectedAdditionalItems = 0;
 
-   vector <IndexTarget*>::const_iterator Target;
-   for (Target = IndexTargets->begin();
-        Target != IndexTargets->end();
+   for (std::vector <IndexTarget>::iterator Target = IndexTargets.begin();
+        Target != IndexTargets.end();
         ++Target)
    {
-      if (verify == true && TransactionManager->MetaIndexParser->Exists((*Target)->MetaKey) == false)
+      bool trypdiff = Target->OptionBool(IndexTarget::PDIFFS);
+      if (verify == true)
       {
-        // optional target that we do not have in the Release file are skipped
-        if ((*Target)->IsOptional())
+        if (TransactionManager->MetaIndexParser->Exists(Target->MetaKey) == false)
+        {
+           // optional targets that we do not have in the Release file are skipped
+           if (Target->IsOptional)
+              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;
+        }
+
+        // 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)
+        {
+           std::ostringstream os;
+           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 = GetFinalFileNameFromURI(Target->URI);
+        if (RealFileExists(filename) == false)
+        {
+           if (Target->KeepCompressed)
+           {
+              filename = GetKeepCompressedFileName(filename, *Target);
+              if (RealFileExists(filename) == false)
+                 filename.clear();
+           }
+           else
+              filename.clear();
+        }
+
+        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)
+                 filename.clear();
+           }
+           else
+              filename.clear();
+        }
+        else
+           trypdiff = false; // no file to patch
+
+        if (filename.empty() == false)
+        {
+           new NoActionItem(Owner, *Target, filename);
            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;
+        // check if we have patches available
+        trypdiff &= TransactionManager->MetaIndexParser->Exists(Target->MetaKey + ".diff/Index");
+      }
+      else
+      {
+        // if we have no file to patch, no point in trying
+        std::string filename = GetFinalFileNameFromURI(Target->URI);
+        if (RealFileExists(filename) == false)
+        {
+           if (Target->KeepCompressed)
+           {
+              filename = GetKeepCompressedFileName(filename, *Target);
+              if (RealFileExists(filename) == false)
+                 filename.clear();
+           }
+           else
+              filename.clear();
+        }
+        trypdiff &= (filename.empty() == false);
+      }
+
+      // no point in patching from local sources
+      if (trypdiff)
+      {
+        std::string const proto = Target->URI.substr(0, strlen("file:/"));
+        if (proto == "file:/" || proto == "copy:/" || proto == "cdrom:")
+           trypdiff = false;
       }
 
-      /* Queue the Index file (Packages, Sources, Translation-$foo
-         (either diff or full packages files, depending
-         on the users option) - we also check if the PDiff Index file is listed
-         in the Meta-Index file. Ideal would be if pkgAcqDiffIndex would test this
-         instead, but passing the required info to it is to much hassle */
-      if(_config->FindB("Acquire::PDiffs",true) == true && (verify == false ||
-          TransactionManager->MetaIndexParser->Exists((*Target)->MetaKey + ".diff/Index") == true))
+      // Queue the Index file (Packages, Sources, Translation-$foo, …)
+      if (trypdiff)
          new pkgAcqDiffIndex(Owner, TransactionManager, *Target);
       else
          new pkgAcqIndex(Owner, TransactionManager, *Target);
@@ -965,19 +1149,19 @@ bool pkgAcqMetaBase::VerifyVendor(string const &Message)         /*{{{*/
       Transformed = "";
    }
 
-   if (_config->FindB("Acquire::Check-Valid-Until", true) == true &&
-       TransactionManager->MetaIndexParser->GetValidUntil() > 0) {
+   if (TransactionManager->MetaIndexParser->GetValidUntil() > 0)
+   {
       time_t const invalid_since = time(NULL) - TransactionManager->MetaIndexParser->GetValidUntil();
       if (invalid_since > 0)
       {
         std::string errmsg;
         strprintf(errmsg,
               // TRANSLATOR: The first %s is the URL of the bad Release file, the second is
-              // the time since then the file is invalid - formated in the same way as in
+              // the time since then the file is invalid - formatted in the same way as in
               // the download progress display (e.g. 7d 3h 42min 1s)
               _("Release file for %s is expired (invalid since %s). "
                  "Updates for this repository will not be applied."),
-              DataTarget.URI.c_str(), TimeToStr(invalid_since).c_str());
+              Target.URI.c_str(), TimeToStr(invalid_since).c_str());
         if (ErrorText.empty())
            ErrorText = errmsg;
         return _error->Error("%s", errmsg.c_str());
@@ -992,14 +1176,16 @@ bool pkgAcqMetaBase::VerifyVendor(string const &Message)         /*{{{*/
       TransactionManager->IMSHit = true;
       unlink(DestFile.c_str());
       PartialFile = DestFile = GetFinalFilename();
-      delete TransactionManager->MetaIndexParser;
-      TransactionManager->MetaIndexParser = TransactionManager->LastMetaIndexParser;
+      // 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.
+      TransactionManager->MetaIndexParser->swapLoad(TransactionManager->LastMetaIndexParser);
+      delete TransactionManager->LastMetaIndexParser;
       TransactionManager->LastMetaIndexParser = NULL;
    }
 
    if (_config->FindB("Debug::pkgAcquire::Auth", false)) 
    {
-      std::cerr << "Got Codename: " << TransactionManager->MetaIndexParser->GetDist() << std::endl;
+      std::cerr << "Got Codename: " << TransactionManager->MetaIndexParser->GetCodename() << std::endl;
       std::cerr << "Expecting Dist: " << TransactionManager->MetaIndexParser->GetExpectedDist() << std::endl;
       std::cerr << "Transformed Dist: " << Transformed << std::endl;
    }
@@ -1010,37 +1196,43 @@ bool pkgAcqMetaBase::VerifyVendor(string const &Message)                /*{{{*/
 //       Status = StatAuthError;
 //       ErrorText = "Conflicting distribution; expected "
 //          + MetaIndexParser->GetExpectedDist() + " but got "
-//          + MetaIndexParser->GetDist();
+//          + MetaIndexParser->GetCodename();
 //       return false;
       if (!Transformed.empty())
       {
          _error->Warning(_("Conflicting distribution: %s (expected %s but got %s)"),
                          Desc.Description.c_str(),
                          Transformed.c_str(),
-                         TransactionManager->MetaIndexParser->GetDist().c_str());
+                         TransactionManager->MetaIndexParser->GetCodename().c_str());
       }
    }
 
    return true;
 }
                                                                        /*}}}*/
+pkgAcqMetaBase::~pkgAcqMetaBase()
+{
+}
 
 pkgAcqMetaClearSig::pkgAcqMetaClearSig(pkgAcquire * const Owner,       /*{{{*/
       IndexTarget const &ClearsignedTarget,
       IndexTarget const &DetachedDataTarget, IndexTarget const &DetachedSigTarget,
-      const vector<IndexTarget*>* const IndexTargets,
-      indexRecords * const MetaIndexParser) :
-   pkgAcqMetaIndex(Owner, this, ClearsignedTarget, DetachedSigTarget, IndexTargets, MetaIndexParser),
-   ClearsignedTarget(ClearsignedTarget),
-   DetachedDataTarget(DetachedDataTarget), DetachedSigTarget(DetachedSigTarget)
+      std::vector<IndexTarget> const &IndexTargets,
+      metaIndex * const MetaIndexParser) :
+   pkgAcqMetaIndex(Owner, this, ClearsignedTarget, DetachedSigTarget, IndexTargets),
+   d(NULL), ClearsignedTarget(ClearsignedTarget),
+   DetachedDataTarget(DetachedDataTarget),
+   MetaIndexParser(MetaIndexParser), LastMetaIndexParser(NULL)
 {
    // index targets + (worst case:) Release/Release.gpg
-   ExpectedAdditionalItems = IndexTargets->size() + 2;
+   ExpectedAdditionalItems = IndexTargets.size() + 2;
    TransactionManager->Add(this);
 }
                                                                        /*}}}*/
 pkgAcqMetaClearSig::~pkgAcqMetaClearSig()                              /*{{{*/
 {
+   if (LastMetaIndexParser != NULL)
+      delete LastMetaIndexParser;
 }
                                                                        /*}}}*/
 // pkgAcqMetaClearSig::Custom600Headers - Insert custom request headers        /*{{{*/
@@ -1048,41 +1240,30 @@ string pkgAcqMetaClearSig::Custom600Headers() const
 {
    string Header = pkgAcqMetaBase::Custom600Headers();
    Header += "\nFail-Ignore: true";
+   std::string const key = TransactionManager->MetaIndexParser->GetSignedBy();
+   if (key.empty() == false)
+      Header += "\nSigned-By: " + key;
+
    return Header;
 }
                                                                        /*}}}*/
-// pkgAcqMetaClearSig::Done - We got a file                            /*{{{*/
-class APT_HIDDEN DummyItem : public pkgAcquire::Item
+bool pkgAcqMetaClearSig::VerifyDone(std::string const &Message,
+        pkgAcquire::MethodConfig const * const Cnf)
 {
-   IndexTarget const * const Target;
-   public:
-   virtual std::string DescURI() const {return Target->URI;};
-   virtual HashStringList GetExpectedHashes()  const {return HashStringList();};
+   Item::VerifyDone(Message, Cnf);
 
-   DummyItem(pkgAcquire * const Owner, IndexTarget const * const Target) :
-      pkgAcquire::Item(Owner), Target(Target)
-   {
-      Status = StatDone;
-      DestFile = GetFinalFileNameFromURI(Target->URI);
-   }
-};
+   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,
                               pkgAcquire::MethodConfig const * const Cnf)
 {
    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)
@@ -1098,8 +1279,8 @@ void pkgAcqMetaClearSig::Done(std::string const &Message,
         // We got an InRelease file IMSHit, but we haven't one, which means
         // we had a valid Release/Release.gpg combo stepping in, which we have
         // to 'acquire' now to ensure list cleanup isn't removing them
-        new DummyItem(Owner, &DetachedDataTarget);
-        new DummyItem(Owner, &DetachedSigTarget);
+        new NoActionItem(Owner, DetachedDataTarget);
+        new NoActionItem(Owner, DetachedSigTarget);
       }
    }
 }
@@ -1113,13 +1294,23 @@ void pkgAcqMetaClearSig::Failed(string const &Message,pkgAcquire::MethodConfig c
 
    if (AuthPass == false)
    {
+      if (Status == StatAuthError)
+      {
+        // if we expected a ClearTextSignature (InRelease) and 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)
       TransactionManager->TransactionStageRemoval(this, GetFinalFilename());
       Status = StatDone;
 
-      new pkgAcqMetaIndex(Owner, TransactionManager, DetachedDataTarget, DetachedSigTarget, IndexTargets, TransactionManager->MetaIndexParser);
+      new pkgAcqMetaIndex(Owner, TransactionManager, DetachedDataTarget, DetachedSigTarget, IndexTargets);
    }
    else
    {
@@ -1151,25 +1342,28 @@ void pkgAcqMetaClearSig::Failed(string const &Message,pkgAcquire::MethodConfig c
            // open the last Release if we have it
            if (TransactionManager->IMSHit == false)
            {
-              TransactionManager->LastMetaIndexParser = new indexRecords;
-              _error->PushToStack();
-              if (RealFileExists(FinalInRelease))
-                 TransactionManager->LastMetaIndexParser->Load(FinalInRelease);
-              else
-                 TransactionManager->LastMetaIndexParser->Load(FinalRelease);
-              // its unlikely to happen, but if what we have is bad ignore it
-              if (_error->PendingError())
+              TransactionManager->LastMetaIndexParser = TransactionManager->MetaIndexParser->UnloadedClone();
+              if (TransactionManager->LastMetaIndexParser != NULL)
               {
-                 delete TransactionManager->LastMetaIndexParser;
-                 TransactionManager->LastMetaIndexParser = NULL;
+                 _error->PushToStack();
+                 if (RealFileExists(FinalInRelease))
+                    TransactionManager->LastMetaIndexParser->Load(FinalInRelease, NULL);
+                 else
+                    TransactionManager->LastMetaIndexParser->Load(FinalRelease, NULL);
+                 // its unlikely to happen, but if what we have is bad ignore it
+                 if (_error->PendingError())
+                 {
+                    delete TransactionManager->LastMetaIndexParser;
+                    TransactionManager->LastMetaIndexParser = NULL;
+                 }
+                 _error->RevertToStack();
               }
-              _error->RevertToStack();
            }
         }
 
         // we parse the indexes here because at this point the user wanted
         // a repository that may potentially harm him
-        if (TransactionManager->MetaIndexParser->Load(PartialRelease) == false || VerifyVendor(Message) == false)
+        if (TransactionManager->MetaIndexParser->Load(PartialRelease, &ErrorText) == false || VerifyVendor(Message) == false)
            /* expired Release files are still a problem you need extra force for */;
         else
            QueueIndexes(true);
@@ -1179,12 +1373,11 @@ void pkgAcqMetaClearSig::Failed(string const &Message,pkgAcquire::MethodConfig c
                                                                        /*}}}*/
 
 pkgAcqMetaIndex::pkgAcqMetaIndex(pkgAcquire * const Owner,             /*{{{*/
-                                 pkgAcqMetaBase * const TransactionManager,
+                                 pkgAcqMetaClearSig * const TransactionManager,
                                 IndexTarget const &DataTarget,
                                 IndexTarget const &DetachedSigTarget,
-                                vector<IndexTarget*> const * const IndexTargets,
-                                indexRecords * const MetaIndexParser) :
-   pkgAcqMetaBase(Owner, TransactionManager, IndexTargets, DataTarget, MetaIndexParser),
+                                vector<IndexTarget> const &IndexTargets) :
+   pkgAcqMetaBase(Owner, TransactionManager, IndexTargets, DataTarget), d(NULL),
    DetachedSigTarget(DetachedSigTarget)
 {
    if(_config->FindB("Debug::Acquire::Transaction", false) == true)
@@ -1200,7 +1393,7 @@ pkgAcqMetaIndex::pkgAcqMetaIndex(pkgAcquire * const Owner,                /*{{{*/
    Desc.URI = DataTarget.URI;
 
    // we expect more item
-   ExpectedAdditionalItems = IndexTargets->size();
+   ExpectedAdditionalItems = IndexTargets.size();
    QueueURI(Desc);
 }
                                                                        /*}}}*/
@@ -1215,7 +1408,7 @@ void pkgAcqMetaIndex::Done(string const &Message,                 /*{{{*/
       // we have a Release file, now download the Signature, all further
       // verify/queue for additional downloads will be done in the
       // pkgAcqMetaSig::Done() code
-      new pkgAcqMetaSig(Owner, TransactionManager, &DetachedSigTarget, this);
+      new pkgAcqMetaSig(Owner, TransactionManager, DetachedSigTarget, this);
    }
 }
                                                                        /*}}}*/
@@ -1228,7 +1421,7 @@ void pkgAcqMetaIndex::Failed(string const &Message,
 
    _error->Warning(_("The repository '%s' does not have a Release file. "
                      "This is deprecated, please contact the owner of the "
-                     "repository."), DataTarget.Description.c_str());
+                     "repository."), Target.Description.c_str());
 
    // No Release file was present so fall
    // back to queueing Packages files without verification
@@ -1237,8 +1430,6 @@ void pkgAcqMetaIndex::Failed(string const &Message,
    {
       // ensure old Release files are removed
       TransactionManager->TransactionStageRemoval(this, GetFinalFilename());
-      delete TransactionManager->MetaIndexParser;
-      TransactionManager->MetaIndexParser = NULL;
 
       // queue without any kind of hashsum support
       QueueIndexes(false);
@@ -1256,18 +1447,19 @@ void pkgAcqMetaIndex::Finished()                                        /*{{{*/
                                                                        /*}}}*/
 std::string pkgAcqMetaIndex::DescURI() const                           /*{{{*/
 {
-   return DataTarget.URI;
+   return Target.URI;
 }
                                                                        /*}}}*/
+pkgAcqMetaIndex::~pkgAcqMetaIndex() {}
 
 // AcqMetaSig::AcqMetaSig - Constructor                                        /*{{{*/
 pkgAcqMetaSig::pkgAcqMetaSig(pkgAcquire * const Owner,
-      pkgAcqMetaBase * const TransactionManager,
-      IndexTarget const * const Target,
+      pkgAcqMetaClearSig * const TransactionManager,
+      IndexTarget const &Target,
       pkgAcqMetaIndex * const MetaIndex) :
-   pkgAcqTransactionItem(Owner, TransactionManager, Target), MetaIndex(MetaIndex)
+   pkgAcqTransactionItem(Owner, TransactionManager, Target), d(NULL), MetaIndex(MetaIndex)
 {
-   DestFile = GetPartialFileNameFromURI(Target->URI);
+   DestFile = GetPartialFileNameFromURI(Target.URI);
 
    // remove any partial downloaded sig-file in partial/.
    // it may confuse proxies and is too small to warrant a
@@ -1280,10 +1472,10 @@ pkgAcqMetaSig::pkgAcqMetaSig(pkgAcquire * const Owner,
                 << TransactionManager << std::endl;
 
    // Create the item
-   Desc.Description = Target->Description;
+   Desc.Description = Target.Description;
    Desc.Owner = this;
-   Desc.ShortDesc = Target->ShortDesc;
-   Desc.URI = Target->URI;
+   Desc.ShortDesc = Target.ShortDesc;
+   Desc.URI = Target.URI;
 
    // If we got a hit for Release, we will get one for Release.gpg too (or obscure errors),
    // so we skip the download step and go instantly to verification
@@ -1301,6 +1493,16 @@ pkgAcqMetaSig::pkgAcqMetaSig(pkgAcquire * const Owner,
                                                                        /*}}}*/
 pkgAcqMetaSig::~pkgAcqMetaSig()                                                /*{{{*/
 {
+}
+                                                                       /*}}}*/
+// pkgAcqMetaSig::Custom600Headers - Insert custom request headers     /*{{{*/
+std::string pkgAcqMetaSig::Custom600Headers() const
+{
+   std::string Header = pkgAcqTransactionItem::Custom600Headers();
+   std::string const key = TransactionManager->MetaIndexParser->GetSignedBy();
+   if (key.empty() == false)
+      Header += "\nSigned-By: " + key;
+   return Header;
 }
                                                                        /*}}}*/
 // AcqMetaSig::Done - The signature was downloaded/verified            /*{{{*/
@@ -1351,7 +1553,7 @@ void pkgAcqMetaSig::Failed(string const &Message,pkgAcquire::MethodConfig const
    {
       std::string downgrade_msg;
       strprintf(downgrade_msg, _("The repository '%s' is no longer signed."),
-                MetaIndex->DataTarget.Description.c_str());
+                MetaIndex->Target.Description.c_str());
       if(_config->FindB("Acquire::AllowDowngradeToInsecureRepositories"))
       {
          // meh, the users wants to take risks (we still mark the packages
@@ -1373,7 +1575,7 @@ void pkgAcqMetaSig::Failed(string const &Message,pkgAcquire::MethodConfig const
    else
       _error->Warning(_("The data from '%s' is not signed. Packages "
               "from that repository can not be authenticated."),
-           MetaIndex->DataTarget.Description.c_str());
+           MetaIndex->Target.Description.c_str());
 
    // ensures that a Release.gpg file in the lists/ is removed by the transaction
    TransactionManager->TransactionStageRemoval(this, DestFile);
@@ -1386,25 +1588,28 @@ void pkgAcqMetaSig::Failed(string const &Message,pkgAcquire::MethodConfig const
         // open the last Release if we have it
         if (TransactionManager->IMSHit == false)
         {
-           TransactionManager->LastMetaIndexParser = new indexRecords;
-           _error->PushToStack();
-           if (RealFileExists(FinalInRelease))
-              TransactionManager->LastMetaIndexParser->Load(FinalInRelease);
-           else
-              TransactionManager->LastMetaIndexParser->Load(FinalRelease);
-           // its unlikely to happen, but if what we have is bad ignore it
-           if (_error->PendingError())
+           TransactionManager->LastMetaIndexParser = TransactionManager->MetaIndexParser->UnloadedClone();
+           if (TransactionManager->LastMetaIndexParser != NULL)
            {
-              delete TransactionManager->LastMetaIndexParser;
-              TransactionManager->LastMetaIndexParser = NULL;
+              _error->PushToStack();
+              if (RealFileExists(FinalInRelease))
+                 TransactionManager->LastMetaIndexParser->Load(FinalInRelease, NULL);
+              else
+                 TransactionManager->LastMetaIndexParser->Load(FinalRelease, NULL);
+              // its unlikely to happen, but if what we have is bad ignore it
+              if (_error->PendingError())
+              {
+                 delete TransactionManager->LastMetaIndexParser;
+                 TransactionManager->LastMetaIndexParser = NULL;
+              }
+              _error->RevertToStack();
            }
-           _error->RevertToStack();
         }
       }
 
       // 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) == false || MetaIndex->VerifyVendor(Message) == false)
+      if (TransactionManager->MetaIndexParser->Load(MetaIndex->DestFile, &ErrorText) == false || MetaIndex->VerifyVendor(Message) == false)
         /* expired Release files are still a problem you need extra force for */;
       else
         MetaIndex->QueueIndexes(true);
@@ -1425,12 +1630,13 @@ void pkgAcqMetaSig::Failed(string const &Message,pkgAcquire::MethodConfig const
 
 // AcqBaseIndex - Constructor                                          /*{{{*/
 pkgAcqBaseIndex::pkgAcqBaseIndex(pkgAcquire * const Owner,
-      pkgAcqMetaBase * const TransactionManager,
-      IndexTarget const * const Target)
-: pkgAcqTransactionItem(Owner, TransactionManager, Target)
+      pkgAcqMetaClearSig * const TransactionManager,
+      IndexTarget const &Target)
+: pkgAcqTransactionItem(Owner, TransactionManager, Target), d(NULL)
 {
 }
                                                                        /*}}}*/
+pkgAcqBaseIndex::~pkgAcqBaseIndex() {}
 
 // AcqDiffIndex::AcqDiffIndex - Constructor                            /*{{{*/
 // ---------------------------------------------------------------------
@@ -1440,42 +1646,23 @@ pkgAcqBaseIndex::pkgAcqBaseIndex(pkgAcquire * const Owner,
  * the original packages file
  */
 pkgAcqDiffIndex::pkgAcqDiffIndex(pkgAcquire * const Owner,
-                                 pkgAcqMetaBase * const TransactionManager,
-                                 IndexTarget const * const Target)
-   : pkgAcqBaseIndex(Owner, TransactionManager, Target)
+                                 pkgAcqMetaClearSig * const TransactionManager,
+                                 IndexTarget const &Target)
+   : pkgAcqBaseIndex(Owner, TransactionManager, Target), d(NULL), diffs(NULL)
 {
    Debug = _config->FindB("Debug::pkgAcquire::Diffs",false);
 
    Desc.Owner = this;
-   Desc.Description = Target->Description + ".diff/Index";
-   Desc.ShortDesc = Target->ShortDesc;
-   Desc.URI = Target->URI + ".diff/Index";
+   Desc.Description = Target.Description + ".diff/Index";
+   Desc.ShortDesc = Target.ShortDesc;
+   Desc.URI = Target.URI + ".diff/Index";
 
    DestFile = GetPartialFileNameFromURI(Desc.URI);
 
    if(Debug)
       std::clog << "pkgAcqDiffIndex: " << Desc.URI << std::endl;
 
-   // look for the current package file
-   CurrentPackagesFile = GetFinalFileNameFromURI(Target->URI);
-
-   // FIXME: this file:/ check is a hack to prevent fetching
-   //        from local sources. this is really silly, and
-   //        should be fixed cleanly as soon as possible
-   if(!FileExists(CurrentPackagesFile) || 
-      Desc.URI.substr(0,strlen("file:/")) == "file:/")
-   {
-      // we don't have a pkg file or we don't want to queue
-      Failed("No index file, local or canceld by user", NULL);
-      return;
-   }
-
-   if(Debug)
-      std::clog << "pkgAcqDiffIndex::pkgAcqDiffIndex(): "
-        << CurrentPackagesFile << std::endl;
-
    QueueURI(Desc);
-
 }
                                                                        /*}}}*/
 // AcqIndex::Custom600Headers - Insert custom request headers          /*{{{*/
@@ -1549,7 +1736,8 @@ bool pkgAcqDiffIndex::ParseDiffIndex(string const &IndexDiffFile) /*{{{*/
       return false;
    }
 
-   HashStringList const TargetFileHashes = GetExpectedHashesFor(Target->MetaKey);
+   std::string const CurrentPackagesFile = GetFinalFileNameFromURI(Target.URI);
+   HashStringList const TargetFileHashes = GetExpectedHashesFor(Target.MetaKey);
    if (TargetFileHashes.usable() == false || ServerHashes != TargetFileHashes)
    {
       if (Debug == true)
@@ -1560,7 +1748,19 @@ bool pkgAcqDiffIndex::ParseDiffIndex(string const &IndexDiffFile)        /*{{{*/
       return false;
    }
 
-   if (ServerHashes.VerifyFile(CurrentPackagesFile) == true)
+   HashStringList LocalHashes;
+   // try avoiding calculating the hash here as this is costly
+   if (TransactionManager->LastMetaIndexParser != NULL)
+      LocalHashes = GetExpectedHashesFromFor(TransactionManager->LastMetaIndexParser, Target.MetaKey);
+   if (LocalHashes.usable() == false)
+   {
+      FileFd fd(CurrentPackagesFile, FileFd::ReadOnly, FileFd::Auto);
+      Hashes LocalHashesCalc(ServerHashes);
+      LocalHashesCalc.AddFD(fd);
+      LocalHashes = LocalHashesCalc.GetHashStringList();
+   }
+
+   if (ServerHashes == LocalHashes)
    {
       // we have the same sha1 as the server so we are done here
       if(Debug)
@@ -1569,14 +1769,9 @@ bool pkgAcqDiffIndex::ParseDiffIndex(string const &IndexDiffFile)        /*{{{*/
       return true;
    }
 
-   FileFd fd(CurrentPackagesFile, FileFd::ReadOnly);
-   Hashes LocalHashesCalc;
-   LocalHashesCalc.AddFD(fd);
-   HashStringList const LocalHashes = LocalHashesCalc.GetHashStringList();
-
    if(Debug)
       std::clog << "Server-Current: " << ServerHashes.find(NULL)->toStr() << " and we start at "
-        << fd.Name() << " " << fd.FileSize() << " " << LocalHashes.find(NULL)->toStr() << std::endl;
+        << CurrentPackagesFile << " " << LocalHashes.FileSize() << " " << LocalHashes.find(NULL)->toStr() << std::endl;
 
    // parse all of (provided) history
    vector<DiffInfo> available_patches;
@@ -1605,7 +1800,7 @@ bool pkgAcqDiffIndex::ParseDiffIndex(string const &IndexDiffFile) /*{{{*/
         std::vector<DiffInfo>::iterator cur = available_patches.begin();
         for (; cur != available_patches.end(); ++cur)
         {
-           if (cur->file != filename || unlikely(cur->result_size != size))
+           if (cur->file != filename)
               continue;
            cur->result_hashes.push_back(HashString(*type, hash));
            break;
@@ -1617,8 +1812,7 @@ bool pkgAcqDiffIndex::ParseDiffIndex(string const &IndexDiffFile) /*{{{*/
            DiffInfo next;
            next.file = filename;
            next.result_hashes.push_back(HashString(*type, hash));
-           next.result_size = size;
-           next.patch_size = 0;
+           next.result_hashes.FileSize(size);
            available_patches.push_back(next);
         }
         else
@@ -1666,10 +1860,9 @@ bool pkgAcqDiffIndex::ParseDiffIndex(string const &IndexDiffFile)        /*{{{*/
         {
            if (cur->file != filename)
               continue;
-           if (unlikely(cur->patch_size != 0 && cur->patch_size != size))
-              continue;
+           if (cur->patch_hashes.empty())
+              cur->patch_hashes.FileSize(size);
            cur->patch_hashes.push_back(HashString(*type, hash));
-           cur->patch_size = size;
            break;
         }
         if (cur != available_patches.end())
@@ -1681,6 +1874,48 @@ bool pkgAcqDiffIndex::ParseDiffIndex(string const &IndexDiffFile)        /*{{{*/
       }
    }
 
+   for (char const * const * type = HashString::SupportedHashes(); *type != NULL; ++type)
+   {
+      std::string tagname = *type;
+      tagname.append("-Download");
+      std::string const tmp = Tags.FindS(tagname.c_str());
+      if (tmp.empty() == true)
+        continue;
+
+      string hash, filename;
+      unsigned long long size;
+      std::stringstream ss(tmp);
+
+      // FIXME: all of pdiff supports only .gz compressed patches
+      while (ss >> hash >> size >> filename)
+      {
+        if (unlikely(hash.empty() == true || filename.empty() == true))
+           continue;
+        if (unlikely(APT::String::Endswith(filename, ".gz") == false))
+           continue;
+        filename.erase(filename.length() - 3);
+
+        // see if we have a record for this file already
+        std::vector<DiffInfo>::iterator cur = available_patches.begin();
+        for (; cur != available_patches.end(); ++cur)
+        {
+           if (cur->file != filename)
+              continue;
+           if (cur->download_hashes.empty())
+              cur->download_hashes.FileSize(size);
+           cur->download_hashes.push_back(HashString(*type, hash));
+           break;
+        }
+        if (cur != available_patches.end())
+              continue;
+        if (Debug == true)
+           std::clog << "pkgAcqDiffIndex: " << IndexDiffFile << ": File " << filename
+              << " wasn't in the list for the first parsed hash! (download)" << std::endl;
+        break;
+      }
+   }
+
+
    bool foundStart = false;
    for (std::vector<DiffInfo>::iterator cur = available_patches.begin();
         cur != available_patches.end(); ++cur)
@@ -1716,7 +1951,7 @@ bool pkgAcqDiffIndex::ParseDiffIndex(string const &IndexDiffFile) /*{{{*/
    unsigned long long patchesSize = 0;
    for (std::vector<DiffInfo>::const_iterator cur = available_patches.begin();
         cur != available_patches.end(); ++cur)
-      patchesSize += cur->patch_size;
+      patchesSize += cur->patch_hashes.FileSize();
    unsigned long long const sizeLimit = ServerSize * _config->FindI("Acquire::PDiffs::SizeLimit", 100);
    if (sizeLimit > 0 && (sizeLimit/100) < patchesSize)
    {
@@ -1748,7 +1983,7 @@ bool pkgAcqDiffIndex::ParseDiffIndex(string const &IndexDiffFile) /*{{{*/
       new pkgAcqIndexDiffs(Owner, TransactionManager, Target, available_patches);
    else
    {
-      std::vector<pkgAcqIndexMergeDiffs*> *diffs = new std::vector<pkgAcqIndexMergeDiffs*>(available_patches.size());
+      diffs = new std::vector<pkgAcqIndexMergeDiffs*>(available_patches.size());
       for(size_t i = 0; i < available_patches.size(); ++i)
         (*diffs)[i] = new pkgAcqIndexMergeDiffs(Owner, TransactionManager,
                Target,
@@ -1804,6 +2039,11 @@ void pkgAcqDiffIndex::Done(string const &Message,HashStringList const &Hashes,   /
    return;
 }
                                                                        /*}}}*/
+pkgAcqDiffIndex::~pkgAcqDiffIndex()
+{
+   if (diffs != NULL)
+      delete diffs;
+}
 
 // AcqIndexDiffs::AcqIndexDiffs - Constructor                          /*{{{*/
 // ---------------------------------------------------------------------
@@ -1811,37 +2051,32 @@ void pkgAcqDiffIndex::Done(string const &Message,HashStringList const &Hashes,  /
  * for each diff and the index
  */
 pkgAcqIndexDiffs::pkgAcqIndexDiffs(pkgAcquire * const Owner,
-                                   pkgAcqMetaBase * const TransactionManager,
-                                   IndexTarget const * const Target,
+                                   pkgAcqMetaClearSig * const TransactionManager,
+                                   IndexTarget const &Target,
                                   vector<DiffInfo> const &diffs)
-   : pkgAcqBaseIndex(Owner, TransactionManager, Target),
+   : 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);
 
    Desc.Owner = this;
-   Description = Target->Description;
-   Desc.ShortDesc = Target->ShortDesc;
+   Description = Target.Description;
+   Desc.ShortDesc = Target.ShortDesc;
 
    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 (BootstrapPDiffWith(GetPartialFileNameFromURI(Target.URI), GetFinalFilename(), Target) == false)
       {
-        if (symlink(GetFinalFilename().c_str(), PartialFile.c_str()) != 0)
-        {
-           Failed("Link creation of " + PartialFile + " to " + GetFinalFilename() + " failed", NULL);
-           return;
-        }
+        Failed("Bootstrapping of " + DestFile + " failed", NULL);
+        return;
       }
 
       // get the next diff
@@ -1855,11 +2090,14 @@ 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());
    new pkgAcqIndex(Owner, TransactionManager, Target);
    Finish();
 }
@@ -1876,7 +2114,14 @@ void pkgAcqIndexDiffs::Finish(bool allDone)
    // the file will be cleaned
    if(allDone)
    {
-      TransactionManager->TransactionStageCopy(this, DestFile, GetFinalFilename());
+      std::string Final = GetFinalFilename();
+      if (Target.KeepCompressed)
+      {
+        std::string const ext = flExtension(DestFile);
+        if (ext.empty() == false)
+           Final.append(".").append(ext);
+      }
+      TransactionManager->TransactionStageCopy(this, DestFile, Final);
 
       // this is for the "real" finish
       Complete = true;
@@ -1886,6 +2131,8 @@ 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;
@@ -1898,15 +2145,14 @@ void pkgAcqIndexDiffs::Finish(bool allDone)
 bool pkgAcqIndexDiffs::QueueNextDiff()                                 /*{{{*/
 {
    // calc sha1 of the just patched file
-   std::string const FinalFile = GetPartialFileNameFromURI(Target->URI);
-
+   std::string const FinalFile = GetKeepCompressedFileName(GetPartialFileNameFromURI(Target.URI), Target);
    if(!FileExists(FinalFile))
    {
       Failed("Message: No FinalFile " + FinalFile + " available", NULL);
       return false;
    }
 
-   FileFd fd(FinalFile, FileFd::ReadOnly);
+   FileFd fd(FinalFile, FileFd::ReadOnly, FileFd::Extension);
    Hashes LocalHashesCalc;
    LocalHashesCalc.AddFD(fd);
    HashStringList const LocalHashes = LocalHashesCalc.GetHashStringList();
@@ -1914,7 +2160,7 @@ bool pkgAcqIndexDiffs::QueueNextDiff()                                    /*{{{*/
    if(Debug)
       std::clog << "QueueNextDiff: " << FinalFile << " (" << LocalHashes.find(NULL)->toStr() << ")" << std::endl;
 
-   HashStringList const TargetFileHashes = GetExpectedHashesFor(Target->MetaKey);
+   HashStringList const TargetFileHashes = GetExpectedHashesFor(Target.MetaKey);
    if (unlikely(LocalHashes.usable() == false || TargetFileHashes.usable() == false))
    {
       Failed("Local/Expected hashes are not usable", NULL);
@@ -1948,9 +2194,9 @@ bool pkgAcqIndexDiffs::QueueNextDiff()                                    /*{{{*/
    }
 
    // queue the right diff
-   Desc.URI = Target->URI + ".diff/" + available_patches[0].file + ".gz";
+   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;
@@ -1968,28 +2214,13 @@ void pkgAcqIndexDiffs::Done(string const &Message, HashStringList const &Hashes,
 
    Item::Done(Message, Hashes, Cnf);
 
-   // FIXME: verify this download too before feeding it to rred
-   std::string const FinalFile = GetPartialFileNameFromURI(Target->URI);
+   std::string const FinalFile = GetKeepCompressedFileName(GetPartialFileNameFromURI(Target.URI), Target);
+   std::string const PatchFile = GetDiffsPatchFileName(FinalFile);
 
    // success in downloading a diff, enter ApplyDiff state
    if(State == StateFetchDiff)
    {
-      FileFd fd(DestFile, FileFd::ReadOnly, FileFd::Gzip);
-      class Hashes LocalHashesCalc;
-      LocalHashesCalc.AddFD(fd);
-      HashStringList const LocalHashes = LocalHashesCalc.GetHashStringList();
-
-      if (fd.Size() != available_patches[0].patch_size ||
-           available_patches[0].patch_hashes != LocalHashes)
-      {
-        // patchfiles are dated, so bad indicates a bad download, so kill it
-        unlink(DestFile.c_str());
-        Failed("Patch has Size/Hashsum mismatch", NULL);
-        return;
-      }
-
-      // rred excepts the patch as $FinalFile.ed
-      Rename(DestFile,FinalFile+".ed");
+      Rename(DestFile, PatchFile);
 
       if(Debug)
         std::clog << "Sending to rred method: " << FinalFile << std::endl;
@@ -2000,18 +2231,17 @@ void pkgAcqIndexDiffs::Done(string const &Message, HashStringList const &Hashes,
       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((FinalFile + ".ed").c_str());
+      unlink(PatchFile.c_str());
 
       // move into place
-      if(Debug) 
+      if(Debug)
       {
         std::clog << "Moving patched file in place: " << std::endl
                   << DestFile << " -> " << FinalFile << std::endl;
@@ -2031,26 +2261,39 @@ void pkgAcqIndexDiffs::Done(string const &Message, HashStringList const &Hashes,
    }
 }
                                                                        /*}}}*/
+std::string pkgAcqIndexDiffs::Custom600Headers() const                 /*{{{*/
+{
+   if(State != StateApplyDiff)
+      return pkgAcqBaseIndex::Custom600Headers();
+   std::ostringstream patchhashes;
+   HashStringList const ExpectedHashes = available_patches[0].patch_hashes;
+   for (HashStringList::const_iterator hs = ExpectedHashes.begin(); hs != ExpectedHashes.end(); ++hs)
+      patchhashes <<  "\nPatch-0-" << hs->HashType() << "-Hash: " << hs->HashValue();
+   patchhashes << pkgAcqBaseIndex::Custom600Headers();
+   return patchhashes.str();
+}
+                                                                       /*}}}*/
+pkgAcqIndexDiffs::~pkgAcqIndexDiffs() {}
 
 // AcqIndexMergeDiffs::AcqIndexMergeDiffs - Constructor                        /*{{{*/
 pkgAcqIndexMergeDiffs::pkgAcqIndexMergeDiffs(pkgAcquire * const Owner,
-                                             pkgAcqMetaBase * const TransactionManager,
-                                             IndexTarget const * const Target,
+                                             pkgAcqMetaClearSig * const TransactionManager,
+                                             IndexTarget const &Target,
                                              DiffInfo const &patch,
                                              std::vector<pkgAcqIndexMergeDiffs*> const * const allPatches)
-  : pkgAcqBaseIndex(Owner, TransactionManager, Target),
+  : pkgAcqBaseIndex(Owner, TransactionManager, Target), d(NULL),
      patch(patch), allPatches(allPatches), State(StateFetchDiff)
 {
    Debug = _config->FindB("Debug::pkgAcquire::Diffs",false);
 
    Desc.Owner = this;
-   Description = Target->Description;
-   Desc.ShortDesc = Target->ShortDesc;
+   Description = Target.Description;
+   Desc.ShortDesc = Target.ShortDesc;
 
-   Desc.URI = Target->URI + ".diff/" + patch.file + ".gz";
+   Desc.URI = Target.URI + ".diff/" + patch.file + ".gz";
    Desc.Description = Description + " " + patch.file + string(".pdiff");
 
-   DestFile = GetPartialFileNameFromURI(Target->URI + ".diff/" + patch.file);
+   DestFile = GetKeepCompressedFileName(GetPartialFileNameFromURI(Target.URI + ".diff/" + patch.file), Target);
 
    if(Debug)
       std::clog << "pkgAcqIndexMergeDiffs: " << Desc.URI << std::endl;
@@ -2077,9 +2320,13 @@ 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);
+   DestFile = GetKeepCompressedFileName(GetPartialFileNameFromURI(Target.URI), Target);
    RenameOnError(PDiffError);
+   std::string const patchname = GetMergeDiffsPatchFileName(DestFile, patch.file);
+   if (RealFileExists(patchname))
+      rename(patchname.c_str(), std::string(patchname + ".FAILED").c_str());
    new pkgAcqIndex(Owner, TransactionManager, Target);
+   DestFile.clear();
 }
                                                                        /*}}}*/
 void pkgAcqIndexMergeDiffs::Done(string const &Message, HashStringList const &Hashes,  /*{{{*/
@@ -2090,26 +2337,11 @@ void pkgAcqIndexMergeDiffs::Done(string const &Message, HashStringList const &Ha
 
    Item::Done(Message, Hashes, Cnf);
 
-   // FIXME: verify download before feeding it to rred
-   string const FinalFile = GetPartialFileNameFromURI(Target->URI);
-
+   std::string const UncompressedFinalFile = GetPartialFileNameFromURI(Target.URI);
+   std::string const FinalFile = GetKeepCompressedFileName(GetPartialFileNameFromURI(Target.URI), Target);
    if (State == StateFetchDiff)
    {
-      FileFd fd(DestFile, FileFd::ReadOnly, FileFd::Gzip);
-      class Hashes LocalHashesCalc;
-      LocalHashesCalc.AddFD(fd);
-      HashStringList const LocalHashes = LocalHashesCalc.GetHashStringList();
-
-      if (fd.Size() != patch.patch_size || patch.patch_hashes != LocalHashes)
-      {
-        // patchfiles are dated, so bad indicates a bad download, so kill it
-        unlink(DestFile.c_str());
-        Failed("Patch has Size/Hashsum mismatch", NULL);
-        return;
-      }
-
-      // rred expects the patch as $FinalFile.ed.$patchname.gz
-      Rename(DestFile, FinalFile + ".ed." + patch.file + ".gz");
+      Rename(DestFile, GetMergeDiffsPatchFileName(FinalFile, patch.file));
 
       // check if this is the last completed diff
       State = StateDoneDiff;
@@ -2125,10 +2357,9 @@ void pkgAcqIndexMergeDiffs::Done(string const &Message, HashStringList const &Ha
       // 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)
+      if (BootstrapPDiffWith(UncompressedFinalFile, GetFinalFilename(), Target) == false)
       {
-        Failed("Link creation of " + FinalFile + " to " + GetFinalFilename() + " failed", NULL);
+        Failed("Bootstrapping of " + DestFile + " failed", NULL);
         return;
       }
 
@@ -2145,7 +2376,7 @@ void pkgAcqIndexMergeDiffs::Done(string const &Message, HashStringList const &Ha
    else if (State == StateApplyDiff)
    {
       // move the result into place
-      std::string const Final = GetFinalFilename();
+      std::string const Final = GetKeepCompressedFileName(GetFinalFilename(), Target);
       if(Debug)
         std::clog << "Queue patched file in place: " << std::endl
                   << DestFile << " -> " << Final << std::endl;
@@ -2157,8 +2388,8 @@ void pkgAcqIndexMergeDiffs::Done(string const &Message, HashStringList const &Ha
       for (std::vector<pkgAcqIndexMergeDiffs *>::const_iterator I = allPatches->begin();
            I != allPatches->end(); ++I)
       {
-        std::string const PartialFile = GetPartialFileNameFromURI(Target->URI);
-        std::string patch = PartialFile + ".ed." + (*I)->patch.file + ".gz";
+        std::string const PartialFile = GetKeepCompressedFileName(GetPartialFileNameFromURI(Target.URI), Target);
+        std::string const patch = GetMergeDiffsPatchFileName(PartialFile, (*I)->patch.file);
         unlink(patch.c_str());
       }
       unlink(FinalFile.c_str());
@@ -2170,47 +2401,40 @@ void pkgAcqIndexMergeDiffs::Done(string const &Message, HashStringList const &Ha
    }
 }
                                                                        /*}}}*/
+std::string pkgAcqIndexMergeDiffs::Custom600Headers() const            /*{{{*/
+{
+   if(State != StateApplyDiff)
+      return pkgAcqBaseIndex::Custom600Headers();
+   std::ostringstream patchhashes;
+   unsigned int seen_patches = 0;
+   for (std::vector<pkgAcqIndexMergeDiffs *>::const_iterator I = allPatches->begin();
+        I != allPatches->end(); ++I)
+   {
+      HashStringList const ExpectedHashes = (*I)->patch.patch_hashes;
+      for (HashStringList::const_iterator hs = ExpectedHashes.begin(); hs != ExpectedHashes.end(); ++hs)
+        patchhashes <<  "\nPatch-" << seen_patches << "-" << hs->HashType() << "-Hash: " << hs->HashValue();
+      ++seen_patches;
+   }
+   patchhashes << pkgAcqBaseIndex::Custom600Headers();
+   return patchhashes.str();
+}
+                                                                       /*}}}*/
+pkgAcqIndexMergeDiffs::~pkgAcqIndexMergeDiffs() {}
 
 // AcqIndex::AcqIndex - Constructor                                    /*{{{*/
 pkgAcqIndex::pkgAcqIndex(pkgAcquire * const Owner,
-                         pkgAcqMetaBase * const TransactionManager,
-                         IndexTarget const * const Target)
-   : pkgAcqBaseIndex(Owner, TransactionManager, Target)
+                         pkgAcqMetaClearSig * const TransactionManager,
+                         IndexTarget const &Target)
+   : 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);
+   Init(Target.URI, Target.Description, Target.ShortDesc);
 
    if(_config->FindB("Debug::Acquire::Transaction", false) == true)
       std::clog << "New pkgIndex with TransactionManager "
                 << TransactionManager << std::endl;
 }
                                                                        /*}}}*/
-// AcqIndex::AutoSelectCompression - Select compression                        /*{{{*/
-void pkgAcqIndex::AutoSelectCompression()
-{
-   std::vector<std::string> types = APT::Configuration::getCompressionTypes();
-   CompressionExtensions = "";
-   if (TransactionManager->MetaIndexParser != NULL && TransactionManager->MetaIndexParser->Exists(Target->MetaKey))
-   {
-      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(" ");
-      }
-   }
-   else
-   {
-      for (std::vector<std::string>::const_iterator t = types.begin(); t != types.end(); ++t)
-        CompressionExtensions.append(*t).append(" ");
-   }
-   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)
@@ -2295,7 +2519,7 @@ string pkgAcqIndex::Custom600Headers() const
    if (stat(Final.c_str(),&Buf) == 0)
       msg += "\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
 
-   if(Target->IsOptional())
+   if(Target.IsOptional)
       msg += "\nFail-Ignore: true";
 
    return msg;
@@ -2311,13 +2535,13 @@ void pkgAcqIndex::Failed(string const &Message,pkgAcquire::MethodConfig const *
    {
       if (CompressionExtensions.empty() == false)
       {
-        Init(Target->URI, Desc.Description, Desc.ShortDesc);
+        Init(Target.URI, Desc.Description, Desc.ShortDesc);
         Status = StatIdle;
         return;
       }
    }
 
-   if(Target->IsOptional() && GetExpectedHashes().empty() && Stage == STAGE_DOWNLOAD)
+   if(Target.IsOptional && GetExpectedHashes().empty() && Stage == STAGE_DOWNLOAD)
       Status = StatDone;
    else
       TransactionManager->AbortTransaction();
@@ -2328,7 +2552,7 @@ void pkgAcqIndex::ReverifyAfterIMS()
 {
    // update destfile to *not* include the compression extension when doing
    // a reverify (as its uncompressed on disk already)
-   DestFile = GetCompressedFileName(Target->URI, GetPartialFileNameFromURI(Target->URI), CurrentCompressionExtension);
+   DestFile = GetCompressedFileName(Target, GetPartialFileNameFromURI(Target.URI), CurrentCompressionExtension);
 
    // copy FinalFile into partial/ so that we check the hash again
    string FinalFile = GetFinalFilename();
@@ -2337,33 +2561,6 @@ void pkgAcqIndex::ReverifyAfterIMS()
    QueueURI(Desc);
 }
                                                                        /*}}}*/
-// AcqIndex::ValidateFile - Validate the content of the downloaded file        /*{{{*/
-bool pkgAcqIndex::ValidateFile(const std::string &FileName)
-{
-   // FIXME: this can go away once we only ever download stuff that
-   //        has a valid hash and we never do GET based probing
-   // FIXME2: this also leaks debian-isms into the code and should go therefore
-
-   /* Always validate the index file for correctness (all indexes must
-    * have a Package field) (LP: #346386) (Closes: #627642) 
-    */
-   FileFd fd(FileName, FileFd::ReadOnly, FileFd::Extension);
-   // Only test for correctness if the content of the file is not empty
-   // (empty is ok)
-   if (fd.Size() > 0)
-   {
-      pkgTagSection sec;
-      pkgTagFile tag(&fd);
-      
-      // all our current indexes have a field 'Package' in each section
-      if (_error->PendingError() == true ||
-          tag.Step(sec) == false ||
-          sec.Exists("Package") == false)
-         return false;
-   }
-   return true;
-}
-                                                                       /*}}}*/
 // AcqIndex::Done - Finished a fetch                                   /*{{{*/
 // ---------------------------------------------------------------------
 /* This goes through a number of states.. On the initial fetch the
@@ -2395,7 +2592,7 @@ 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;
@@ -2406,17 +2603,11 @@ void pkgAcqIndex::StageDownloadDone(string const &Message, HashStringList const
       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)
+   if (FileName != DestFile && RealFileExists(DestFile) == false)
       Local = true;
    else
       EraseFileName = FileName;
@@ -2431,10 +2622,10 @@ void pkgAcqIndex::StageDownloadDone(string const &Message, HashStringList const
       return;
    }
 
-   // If we have compressed indexes enabled, queue for hash verification
-   if (_config->FindB("Acquire::GzipIndexes",false))
+   // If we want compressed indexes, just copy in place for hash verification
+   if (Target.KeepCompressed == true)
    {
-      DestFile = GetPartialFileNameFromURI(Target->URI + '.' + CurrentCompressionExtension);
+      DestFile = GetPartialFileNameFromURI(Target.URI + '.' + CurrentCompressionExtension);
       EraseFileName = "";
       Stage = STAGE_DECOMPRESS_AND_VERIFY;
       Desc.URI = "copy:" + FileName;
@@ -2464,23 +2655,16 @@ void pkgAcqIndex::StageDownloadDone(string const &Message, HashStringList const
 }
                                                                        /*}}}*/
 // AcqIndex::StageDecompressDone - Final verification                  /*{{{*/
-void pkgAcqIndex::StageDecompressDone(string const &Message,
+void pkgAcqIndex::StageDecompressDone(string const &,
                                       HashStringList const &,
-                                      pkgAcquire::MethodConfig const * const Cfg)
+                                      pkgAcquire::MethodConfig const * const)
 {
-   if(!ValidateFile(DestFile))
-   {
-      RenameOnError(InvalidFormat);
-      Failed(Message, Cfg);
-      return;
-   }
-
    // Done, queue for rename on transaction finished
    TransactionManager->TransactionStageCopy(this, DestFile, GetFinalFilename());
-
    return;
 }
                                                                        /*}}}*/
+pkgAcqIndex::~pkgAcqIndex() {}
 
 
 // AcqArchive::AcqArchive - Constructor                                        /*{{{*/
@@ -2490,7 +2674,7 @@ void pkgAcqIndex::StageDecompressDone(string const &Message,
 pkgAcqArchive::pkgAcqArchive(pkgAcquire * const Owner,pkgSourceList * const Sources,
                             pkgRecords * const Recs,pkgCache::VerIterator const &Version,
                             string &StoreFilename) :
-               Item(Owner), LocalSource(false), Version(Version), Sources(Sources), Recs(Recs),
+               Item(Owner), d(NULL), LocalSource(false), Version(Version), Sources(Sources), Recs(Recs),
                StoreFilename(StoreFilename), Vf(Version.FileList()),
               Trusted(false)
 {
@@ -2511,7 +2695,7 @@ pkgAcqArchive::pkgAcqArchive(pkgAcquire * const Owner,pkgSourceList * const Sour
    // Skip not source sources, they do not have file fields.
    for (; Vf.end() == false; ++Vf)
    {
-      if ((Vf.File()->Flags & pkgCache::Flag::NotSource) != 0)
+      if (Vf.File().Flagged(pkgCache::Flag::NotSource))
         continue;
       break;
    }
@@ -2579,14 +2763,14 @@ bool pkgAcqArchive::QueueNext()
    {
       pkgCache::PkgFileIterator const PkgF = Vf.File();
       // Ignore not source sources
-      if ((PkgF->Flags & pkgCache::Flag::NotSource) != 0)
+      if (PkgF.Flagged(pkgCache::Flag::NotSource))
         continue;
 
       // Try to cross match against the source list
       pkgIndexFile *Index;
       if (Sources->FindIndex(PkgF, Index) == false)
            continue;
-      LocalSource = (PkgF->Flags & pkgCache::Flag::LocalSource) == pkgCache::Flag::LocalSource;
+      LocalSource = PkgF.Flagged(pkgCache::Flag::LocalSource);
 
       // only try to get a trusted package from another source if that source
       // is also trusted
@@ -2693,16 +2877,8 @@ 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
-   if (FileName != DestFile)
+   std::string const FileName = LookupTag(Message,"Filename");
+   if (DestFile !=  FileName && RealFileExists(DestFile) == false)
    {
       StoreFilename = DestFile = FileName;
       Local = true;
@@ -2778,13 +2954,216 @@ std::string pkgAcqArchive::ShortDesc() const                           /*{{{*/
    return Desc.ShortDesc;
 }
                                                                        /*}}}*/
+pkgAcqArchive::~pkgAcqArchive() {}
+
+// AcqChangelog::pkgAcqChangelog - Constructors                                /*{{{*/
+pkgAcqChangelog::pkgAcqChangelog(pkgAcquire * const Owner, pkgCache::VerIterator const &Ver,
+      std::string const &DestDir, std::string const &DestFilename) :
+   pkgAcquire::Item(Owner), d(NULL), SrcName(Ver.SourcePkgName()), SrcVersion(Ver.SourceVerStr())
+{
+   Desc.URI = URI(Ver);
+   Init(DestDir, DestFilename);
+}
+// some parameters are char* here as they come likely from char* interfaces – which can also return NULL
+pkgAcqChangelog::pkgAcqChangelog(pkgAcquire * const Owner, pkgCache::RlsFileIterator const &RlsFile,
+      char const * const Component, char const * const SrcName, char const * const SrcVersion,
+      const string &DestDir, const string &DestFilename) :
+   pkgAcquire::Item(Owner), d(NULL), SrcName(SrcName), SrcVersion(SrcVersion)
+{
+   Desc.URI = URI(RlsFile, Component, SrcName, SrcVersion);
+   Init(DestDir, DestFilename);
+}
+pkgAcqChangelog::pkgAcqChangelog(pkgAcquire * const Owner,
+      std::string const &URI, char const * const SrcName, char const * const SrcVersion,
+      const string &DestDir, const string &DestFilename) :
+   pkgAcquire::Item(Owner), d(NULL), SrcName(SrcName), SrcVersion(SrcVersion)
+{
+   Desc.URI = URI;
+   Init(DestDir, DestFilename);
+}
+void pkgAcqChangelog::Init(std::string const &DestDir, std::string const &DestFilename)
+{
+   if (Desc.URI.empty())
+   {
+      Status = StatError;
+      // TRANSLATOR: %s=%s is sourcename=sourceversion, e.g. apt=1.1
+      strprintf(ErrorText, _("Changelog unavailable for %s=%s"), SrcName.c_str(), SrcVersion.c_str());
+      // Let the error message print something sensible rather than "Failed to fetch /"
+      if (DestFilename.empty())
+        DestFile = SrcName + ".changelog";
+      else
+        DestFile = DestFilename;
+      Desc.URI = "changelog:/" + DestFile;
+      return;
+   }
+
+   if (DestDir.empty())
+   {
+      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))
+      {
+        _error->Errno("mkdtemp", "mkdtemp failed in changelog acquire of %s %s", SrcName.c_str(), SrcVersion.c_str());
+        Status = StatError;
+        return;
+      }
+      DestFile = TemporaryDirectory = tmpname;
+
+      ChangeOwnerAndPermissionOfFile("Item::QueueURI", DestFile.c_str(),
+                                     SandboxUser.c_str(), "root", 0700);
+   }
+   else
+      DestFile = DestDir;
+
+   if (DestFilename.empty())
+      DestFile = flCombine(DestFile, SrcName + ".changelog");
+   else
+      DestFile = flCombine(DestFile, DestFilename);
+
+   Desc.ShortDesc = "Changelog";
+   strprintf(Desc.Description, "%s %s %s Changelog", URI::SiteOnly(Desc.URI).c_str(), SrcName.c_str(), SrcVersion.c_str());
+   Desc.Owner = this;
+   QueueURI(Desc);
+}
+                                                                       /*}}}*/
+std::string pkgAcqChangelog::URI(pkgCache::VerIterator const &Ver)     /*{{{*/
+{
+   char const * const SrcName = Ver.SourcePkgName();
+   char const * const SrcVersion = Ver.SourceVerStr();
+   pkgCache::PkgFileIterator PkgFile;
+   // find the first source for this version which promises a changelog
+   for (pkgCache::VerFileIterator VF = Ver.FileList(); VF.end() == false; ++VF)
+   {
+      pkgCache::PkgFileIterator const PF = VF.File();
+      if (PF.Flagged(pkgCache::Flag::NotSource) || PF->Release == 0)
+        continue;
+      PkgFile = PF;
+      pkgCache::RlsFileIterator const RF = PF.ReleaseFile();
+      std::string const uri = URI(RF, PF.Component(), SrcName, SrcVersion);
+      if (uri.empty())
+        continue;
+      return uri;
+   }
+   return "";
+}
+std::string pkgAcqChangelog::URITemplate(pkgCache::RlsFileIterator const &Rls)
+{
+   if (Rls.end() == true || (Rls->Label == 0 && Rls->Origin == 0))
+      return "";
+   std::string const serverConfig = "Acquire::Changelogs::URI";
+   std::string server;
+#define APT_EMPTY_SERVER \
+   if (server.empty() == false) \
+   { \
+      if (server != "no") \
+        return server; \
+      return ""; \
+   }
+#define APT_CHECK_SERVER(X, Y) \
+   if (Rls->X != 0) \
+   { \
+      std::string const specialServerConfig = serverConfig + "::" + Y + #X + "::" + Rls.X(); \
+      server = _config->Find(specialServerConfig); \
+      APT_EMPTY_SERVER \
+   }
+   // this way e.g. Debian-Security can fallback to Debian
+   APT_CHECK_SERVER(Label, "Override::")
+   APT_CHECK_SERVER(Origin, "Override::")
+
+   if (RealFileExists(Rls.FileName()))
+   {
+      _error->PushToStack();
+      FileFd rf;
+      /* This can be costly. A caller wanting to get millions of URIs might
+        want to do this on its own once and use Override settings.
+        We don't do this here as Origin/Label are not as unique as they
+        should be so this could produce request order-dependent anomalies */
+      if (OpenMaybeClearSignedFile(Rls.FileName(), rf) == true)
+      {
+        pkgTagFile TagFile(&rf, rf.Size());
+        pkgTagSection Section;
+        if (TagFile.Step(Section) == true)
+           server = Section.FindS("Changelogs");
+      }
+      _error->RevertToStack();
+      APT_EMPTY_SERVER
+   }
+
+   APT_CHECK_SERVER(Label, "")
+   APT_CHECK_SERVER(Origin, "")
+#undef APT_CHECK_SERVER
+#undef APT_EMPTY_SERVER
+   return "";
+}
+std::string pkgAcqChangelog::URI(pkgCache::RlsFileIterator const &Rls,
+        char const * const Component, char const * const SrcName,
+        char const * const SrcVersion)
+{
+   return URI(URITemplate(Rls), Component, SrcName, SrcVersion);
+}
+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)
+      return "";
+
+   // the path is: COMPONENT/SRC/SRCNAME/SRCNAME_SRCVER, e.g. main/a/apt/1.1 or contrib/liba/libapt/2.0
+   std::string Src = SrcName;
+   std::string path = APT::String::Startswith(SrcName, "lib") ? Src.substr(0, 4) : Src.substr(0,1);
+   path.append("/").append(Src).append("/");
+   path.append(Src).append("_").append(StripEpoch(SrcVersion));
+   // we omit component for releases without one (= flat-style repositories)
+   if (Component != NULL && strlen(Component) != 0)
+      path = std::string(Component) + "/" + path;
+
+   return SubstVar(Template, "CHANGEPATH", path);
+}
+                                                                       /*}}}*/
+// AcqChangelog::Failed - Failure handler                              /*{{{*/
+void pkgAcqChangelog::Failed(string const &Message, pkgAcquire::MethodConfig const * const Cnf)
+{
+   Item::Failed(Message,Cnf);
+
+   std::string errText;
+   // TRANSLATOR: %s=%s is sourcename=sourceversion, e.g. apt=1.1
+   strprintf(errText, _("Changelog unavailable for %s=%s"), SrcName.c_str(), SrcVersion.c_str());
+
+   // Error is probably something techy like 404 Not Found
+   if (ErrorText.empty())
+      ErrorText = errText;
+   else
+      ErrorText = errText + " (" + ErrorText + ")";
+   return;
+}
+                                                                       /*}}}*/
+// AcqChangelog::Done - Item downloaded OK                             /*{{{*/
+void pkgAcqChangelog::Done(string const &Message,HashStringList const &CalcHashes,
+                     pkgAcquire::MethodConfig const * const Cnf)
+{
+   Item::Done(Message,CalcHashes,Cnf);
+
+   Complete = true;
+}
+                                                                       /*}}}*/
+pkgAcqChangelog::~pkgAcqChangelog()                                    /*{{{*/
+{
+   if (TemporaryDirectory.empty() == false)
+   {
+      unlink(DestFile.c_str());
+      rmdir(TemporaryDirectory.c_str());
+   }
+}
+                                                                       /*}}}*/
 
 // AcqFile::pkgAcqFile - Constructor                                   /*{{{*/
 pkgAcqFile::pkgAcqFile(pkgAcquire * const Owner,string const &URI, HashStringList const &Hashes,
                       unsigned long long const Size,string const &Dsc,string const &ShortDesc,
                       const string &DestDir, const string &DestFilename,
                        bool const IsIndexFile) :
-                       Item(Owner), IsIndexFile(IsIndexFile), ExpectedHashes(Hashes)
+                       Item(Owner), d(NULL), IsIndexFile(IsIndexFile), ExpectedHashes(Hashes)
 {
    Retries = _config->FindI("Acquire::Retries",0);
 
@@ -2824,14 +3203,7 @@ 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
@@ -2839,7 +3211,7 @@ void pkgAcqFile::Done(string const &Message,HashStringList const &CalcHashes,
       return;
 
    // We have to copy it into place
-   if (FileName != DestFile)
+   if (RealFileExists(DestFile.c_str()) == false)
    {
       Local = true;
       if (_config->FindB("Acquire::Source-Symlinks",true) == false ||
@@ -2900,3 +3272,4 @@ string pkgAcqFile::Custom600Headers() const                               /*{{{*/
    return "";
 }
                                                                        /*}}}*/
+pkgAcqFile::~pkgAcqFile() {}