Sort the list of sources to be built and linked

[apt.git] / apt-pkg / acquire-item.cc

diff --git a/apt-pkg/acquire-item.cc b/apt-pkg/acquire-item.cc
index 02beb9bbf09e0f374dcd29999af7edda7703f412..446551cc2ee1a7c8bf38fa7d00599f27c91b2e60 100644 (file)
--- a/apt-pkg/acquire-item.cc
+++ b/apt-pkg/acquire-item.cc
@@ -85,32 +85,16 @@ static std::string GetKeepCompressedFileName(std::string file, IndexTarget const
    if (Target.KeepCompressed == false)
       return file;
 
    if (Target.KeepCompressed == false)
       return file;
 

-   std::string const CompressionTypes = Target.Option(IndexTarget::COMPRESSIONTYPES);
-   if (CompressionTypes.empty() == false)
+   std::string const KeepCompressedAs = Target.Option(IndexTarget::KEEPCOMPRESSEDAS);
+   if (KeepCompressedAs.empty() == false)

    {
    {

-      std::string const ext = CompressionTypes.substr(0, CompressionTypes.find(' '));
+      std::string const ext = KeepCompressedAs.substr(0, KeepCompressedAs.find(' '));

       if (ext != "uncompressed")
         file.append(".").append(ext);
    }
    return file;
 }
                                                                        /*}}}*/
       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 (Target.URI.substr(0,6) == "cdrom:")
-      return Name;
-
-   // adjust DestFile if its compressed on disk
-   if (Target.KeepCompressed == true)
-      return Name + '.' + Ext;
-   return Name;
-}
-                                                                       /*}}}*/

 static std::string GetMergeDiffsPatchFileName(std::string const &Final, std::string const &Patch)/*{{{*/
 {
    // rred expects the patch as $FinalFile.ed.$patchname.gz
 static std::string GetMergeDiffsPatchFileName(std::string const &Final, std::string const &Patch)/*{{{*/
 {
    // rred expects the patch as $FinalFile.ed.$patchname.gz


@@ -123,28 +107,17 @@ static std::string GetDiffsPatchFileName(std::string const &Final)        /*{{{*/
    return Final + ".ed";
 }
                                                                        /*}}}*/
    return Final + ".ed";
 }
                                                                        /*}}}*/

-static bool BootstrapPDiffWith(std::string const &PartialFile, std::string const &FinalFile, IndexTarget const &Target)/*{{{*/
+static std::string GetExistingFilename(std::string const &File)                /*{{{*/

 {
 {

-   // 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)
+   if (RealFileExists(File))
+      return File;
+   for (auto const &type : APT::Configuration::getCompressorExtensions())

    {
    {

-      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;
+      std::string const Final = File + type;
+      if (RealFileExists(Final))
+        return Final;

    }
    }

-   return typeItr != types.cend();
+   return "";

 }
                                                                        /*}}}*/
 
 }
                                                                        /*}}}*/
 


@@ -337,7 +310,7 @@ std::string pkgAcqDiffIndex::GetFinalFilename() const
 std::string pkgAcqIndex::GetFinalFilename() const
 {
    std::string const FinalFile = GetFinalFileNameFromURI(Target.URI);
 std::string pkgAcqIndex::GetFinalFilename() const
 {
    std::string const FinalFile = GetFinalFileNameFromURI(Target.URI);

-   return GetCompressedFileName(Target, FinalFile, CurrentCompressionExtension);
+   return GetKeepCompressedFileName(FinalFile, Target);

 }
 std::string pkgAcqMetaSig::GetFinalFilename() const
 {
 }
 std::string pkgAcqMetaSig::GetFinalFilename() const
 {


@@ -390,7 +363,30 @@ bool pkgAcqTransactionItem::TransactionState(TransactionStates const state)
       case TransactionCommit:
         if(PartialFile.empty() == false)
         {
       case TransactionCommit:
         if(PartialFile.empty() == false)
         {

-           if (PartialFile != DestFile)
+           bool sameFile = (PartialFile == DestFile);
+           // we use symlinks on IMS-Hit to avoid copies
+           if (RealFileExists(DestFile))
+           {
+              struct stat Buf;
+              if (lstat(PartialFile.c_str(), &Buf) != -1)
+              {
+                 if (S_ISLNK(Buf.st_mode) && Buf.st_size > 0)
+                 {
+                    char partial[Buf.st_size + 1];
+                    ssize_t const sp = readlink(PartialFile.c_str(), partial, Buf.st_size);
+                    if (sp == -1)
+                       _error->Errno("pkgAcqTransactionItem::TransactionState-sp", _("Failed to readlink %s"), PartialFile.c_str());
+                    else
+                    {
+                       partial[sp] = '\0';
+                       sameFile = (DestFile == partial);
+                    }
+                 }
+              }
+              else
+                 _error->Errno("pkgAcqTransactionItem::TransactionState-stat", _("Failed to stat %s"), PartialFile.c_str());
+           }
+           if (sameFile == false)

            {
               // ensure that even without lists-cleanup all compressions are nuked
               std::string FinalFile = GetFinalFileNameFromURI(Target.URI);
            {
               // ensure that even without lists-cleanup all compressions are nuked
               std::string FinalFile = GetFinalFileNameFromURI(Target.URI);


@@ -1144,19 +1140,7 @@ void pkgAcqMetaBase::QueueIndexes(bool const verify)                     /*{{{*/
         else
            Target->Options["COMPRESSIONTYPES"].clear();
 
         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();
-        }
-
+        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 (filename.empty() == false)
         {
            // if the Release file is a hit and we have an index it must be the current one


@@ -1193,19 +1177,7 @@ void pkgAcqMetaBase::QueueIndexes(bool const verify)                     /*{{{*/
       else
       {
         // if we have no file to patch, no point in trying
       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);
+        trypdiff &= (GetExistingFilename(GetFinalFileNameFromURI(Target->URI)).empty() == false);

       }
 
       // no point in patching from local sources
       }
 
       // no point in patching from local sources


@@ -2060,18 +2032,55 @@ bool pkgAcqDiffIndex::ParseDiffIndex(string const &IndexDiffFile)       /*{{{*/
    }
 
    // calculate the size of all patches we have to get
    }
 
    // calculate the size of all patches we have to get

-   // note that all sizes are uncompressed, while we download compressed files
-   unsigned long long patchesSize = 0;
-   for (std::vector<DiffInfo>::const_iterator cur = available_patches.begin();
-        cur != available_patches.end(); ++cur)
-      patchesSize += cur->patch_hashes.FileSize();
-   unsigned long long const sizeLimit = ServerSize * _config->FindI("Acquire::PDiffs::SizeLimit", 100);
-   if (sizeLimit > 0 && (sizeLimit/100) < patchesSize)
-   {
-      if (Debug)
-        std::clog << "Need " << patchesSize << " bytes (Limit is " << sizeLimit/100
-           << ") so fallback to complete download" << std::endl;
-      return false;
+   unsigned short const sizeLimitPercent = _config->FindI("Acquire::PDiffs::SizeLimit", 100);
+   if (sizeLimitPercent > 0 && TransactionManager->MetaIndexParser != nullptr)
+   {
+      // compressed case
+      unsigned long long downloadSize = std::accumulate(available_patches.begin(),
+           available_patches.end(), 0llu, [](unsigned long long const T, DiffInfo const &I) {
+           return T + I.download_hashes.FileSize();
+           });
+      if (downloadSize != 0)
+      {
+        unsigned long long downloadSizeIdx = 0;
+        auto const types = VectorizeString(Target.Option(IndexTarget::COMPRESSIONTYPES), ' ');
+        for (auto const &t : types)
+        {
+           std::string MetaKey = Target.MetaKey;
+           if (t != "uncompressed")
+              MetaKey += '.' + t;
+           HashStringList const hsl = GetExpectedHashesFor(MetaKey);
+           if (unlikely(hsl.usable() == false))
+              continue;
+           downloadSizeIdx = hsl.FileSize();
+           break;
+        }
+        unsigned long long const sizeLimit = downloadSizeIdx * sizeLimitPercent;
+        if ((sizeLimit/100) < downloadSize)
+        {
+           if (Debug)
+              std::clog << "Need " << downloadSize << " compressed bytes (Limit is " << (sizeLimit/100) << ", "
+                 << "original is " << downloadSizeIdx << ") so fallback to complete download" << std::endl;
+           return false;
+        }
+      }
+      // uncompressed case
+      downloadSize = std::accumulate(available_patches.begin(),
+           available_patches.end(), 0llu, [](unsigned long long const T, DiffInfo const &I) {
+           return T + I.patch_hashes.FileSize();
+           });
+      if (downloadSize != 0)
+      {
+        unsigned long long const downloadSizeIdx = ServerSize;
+        unsigned long long const sizeLimit = downloadSizeIdx * sizeLimitPercent;
+        if ((sizeLimit/100) < downloadSize)
+        {
+           if (Debug)
+              std::clog << "Need " << downloadSize << " uncompressed bytes (Limit is " << (sizeLimit/100) << ", "
+                 << "original is " << downloadSizeIdx << ") so fallback to complete download" << std::endl;
+           return false;
+        }
+      }

    }
 
    // we have something, queue the diffs
    }
 
    // we have something, queue the diffs


@@ -2092,6 +2101,41 @@ bool pkgAcqDiffIndex::ParseDiffIndex(string const &IndexDiffFile)        /*{{{*/
       pdiff_merge = (precedence != "merged");
    }
 
       pdiff_merge = (precedence != "merged");
    }
 

+   // clean the plate
+   {
+      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 PartialFile = GetPartialFileNameFromURI(Target.URI);
+      if (FileExists(PartialFile) && RemoveFile("Bootstrap-linking", PartialFile) == false)
+      {
+        if (Debug)
+           std::clog << "Bootstrap-linking for patching " << CurrentPackagesFile
+              << " by removing stale " << PartialFile << " failed!" << std::endl;
+        return false;
+      }
+      for (auto const &ext : APT::Configuration::getCompressorExtensions())
+      {
+        std::string const Partial = PartialFile + ext;
+        if (FileExists(Partial) && RemoveFile("Bootstrap-linking", Partial) == false)
+        {
+           if (Debug)
+              std::clog << "Bootstrap-linking for patching " << CurrentPackagesFile
+                 << " by removing stale " << Partial << " failed!" << std::endl;
+           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)
+      {
+        if (Debug)
+           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
    if (pdiff_merge == false)
       new pkgAcqIndexDiffs(Owner, TransactionManager, Target, available_patches);
    else


@@ -2186,13 +2230,6 @@ pkgAcqIndexDiffs::pkgAcqIndexDiffs(pkgAcquire * const Owner,
    }
    else
    {
    }
    else
    {

-      if (BootstrapPDiffWith(GetPartialFileNameFromURI(Target.URI), GetFinalFilename(), Target) == false)
-      {
-        Failed("Bootstrapping of " + DestFile + " failed", NULL);
-        return;
-      }
-
-      // get the next diff

       State = StateFetchDiff;
       QueueNextDiff();
    }
       State = StateFetchDiff;
       QueueNextDiff();
    }


@@ -2210,7 +2247,10 @@ void pkgAcqIndexDiffs::Failed(string const &Message,pkgAcquire::MethodConfig con
    RenameOnError(PDiffError);
    std::string const patchname = GetDiffsPatchFileName(DestFile);
    if (RealFileExists(patchname))
    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();
 }
    new pkgAcqIndex(Owner, TransactionManager, Target);
    Finish();
 }


@@ -2227,13 +2267,7 @@ void pkgAcqIndexDiffs::Finish(bool allDone)
    // the file will be cleaned
    if(allDone)
    {
    // the file will be cleaned
    if(allDone)
    {

-      std::string Final = GetFinalFilename();
-      if (Target.KeepCompressed)
-      {
-        std::string const ext = flExtension(DestFile);
-        if (ext.empty() == false)
-           Final.append(".").append(ext);
-      }
+      std::string const Final = GetKeepCompressedFileName(GetFinalFilename(), Target);

       TransactionManager->TransactionStageCopy(this, DestFile, Final);
 
       // this is for the "real" finish
       TransactionManager->TransactionStageCopy(this, DestFile, Final);
 
       // this is for the "real" finish


@@ -2258,29 +2292,28 @@ void pkgAcqIndexDiffs::Finish(bool allDone)
 bool pkgAcqIndexDiffs::QueueNextDiff()                                 /*{{{*/
 {
    // calc sha1 of the just patched file
 bool pkgAcqIndexDiffs::QueueNextDiff()                                 /*{{{*/
 {
    // calc sha1 of the just patched file

-   std::string const FinalFile = GetKeepCompressedFileName(GetPartialFileNameFromURI(Target.URI), Target);
-   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;
    }
 
       return false;
    }
 

-   FileFd fd(FinalFile, FileFd::ReadOnly, FileFd::Extension);
+   FileFd fd(PartialFile, FileFd::ReadOnly, FileFd::Extension);

    Hashes LocalHashesCalc;
    LocalHashesCalc.AddFD(fd);
    HashStringList const LocalHashes = LocalHashesCalc.GetHashStringList();
 
    if(Debug)
    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))
    {
 
    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;
    }
 
       return false;
    }
 

-

    // final file reached before all patches are applied
    if(LocalHashes == TargetFileHashes)
    {
    // final file reached before all patches are applied
    if(LocalHashes == TargetFileHashes)
    {


@@ -2298,7 +2331,7 @@ bool pkgAcqIndexDiffs::QueueNextDiff()                                    /*{{{*/
    // error checking and falling back if no patch was found
    if(available_patches.empty() == true)
    {
    // 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;
    }
 
       return false;
    }
 


@@ -2318,55 +2351,51 @@ bool pkgAcqIndexDiffs::QueueNextDiff()                                  /*{{{*/
 void pkgAcqIndexDiffs::Done(string const &Message, HashStringList const &Hashes,       /*{{{*/
                            pkgAcquire::MethodConfig const * const Cnf)
 {
 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::clog << "pkgAcqIndexDiffs::Done(): " << Desc.URI << std::endl;
 
    Item::Done(Message, Hashes, Cnf);
 

-   std::string const FinalFile = GetKeepCompressedFileName(GetPartialFileNameFromURI(Target.URI), Target);
-   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());
-      RemoveFile("pkgAcqIndexDiffs::Done", PatchFile);
-
-      // 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;

    }
 }
                                                                        /*}}}*/
    }
 }
                                                                        /*}}}*/


@@ -2398,11 +2427,9 @@ pkgAcqIndexMergeDiffs::pkgAcqIndexMergeDiffs(pkgAcquire * const Owner,
    Desc.Owner = this;
    Description = Target.Description;
    Desc.ShortDesc = Target.ShortDesc;
    Desc.Owner = this;
    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 = GetKeepCompressedFileName(GetPartialFileNameFromURI(Target.URI + ".diff/" + patch.file), Target);
+   Desc.Description = Description + " " + patch.file + ".pdiff";
+   DestFile = GetPartialFileNameFromURI(Desc.URI);

 
    if(Debug)
       std::clog << "pkgAcqIndexMergeDiffs: " << Desc.URI << std::endl;
 
    if(Debug)
       std::clog << "pkgAcqIndexMergeDiffs: " << Desc.URI << std::endl;


@@ -2429,13 +2456,15 @@ void pkgAcqIndexMergeDiffs::Failed(string const &Message,pkgAcquire::MethodConfi
    State = StateErrorDiff;
    if (Debug)
       std::clog << "Falling back to normal index file acquire" << std::endl;
    State = StateErrorDiff;
    if (Debug)
       std::clog << "Falling back to normal index file acquire" << std::endl;

-   DestFile = GetKeepCompressedFileName(GetPartialFileNameFromURI(Target.URI), Target);

    RenameOnError(PDiffError);
    RenameOnError(PDiffError);

-   std::string const patchname = GetMergeDiffsPatchFileName(DestFile, patch.file);
+   std::string const patchname = GetPartialFileNameFromURI(Desc.URI);

    if (RealFileExists(patchname))
    if (RealFileExists(patchname))

-      rename(patchname.c_str(), std::string(patchname + ".FAILED").c_str());
-   new pkgAcqIndex(Owner, TransactionManager, Target);
+      Rename(patchname, patchname + ".FAILED");
+   std::string const UnpatchedFile = GetExistingFilename(GetPartialFileNameFromURI(Target.URI));
+   if (UnpatchedFile.empty() == false && FileExists(UnpatchedFile))
+      Rename(UnpatchedFile, UnpatchedFile + ".FAILED");

    DestFile.clear();
    DestFile.clear();

+   new pkgAcqIndex(Owner, TransactionManager, Target);

 }
                                                                        /*}}}*/
 void pkgAcqIndexMergeDiffs::Done(string const &Message, HashStringList const &Hashes,  /*{{{*/
 }
                                                                        /*}}}*/
 void pkgAcqIndexMergeDiffs::Done(string const &Message, HashStringList const &Hashes,  /*{{{*/


@@ -2446,67 +2475,58 @@ void pkgAcqIndexMergeDiffs::Done(string const &Message, HashStringList const &Ha
 
    Item::Done(Message, Hashes, Cnf);
 
 
    Item::Done(Message, Hashes, Cnf);
 

-   std::string const UncompressedFinalFile = GetPartialFileNameFromURI(Target.URI);
-   std::string const FinalFile = GetKeepCompressedFileName(GetPartialFileNameFromURI(Target.URI), Target);
-   if (State == StateFetchDiff)
-   {
-      Rename(DestFile, GetMergeDiffsPatchFileName(FinalFile, patch.file));
+   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);

 
 

-      // 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;
-
-      if (BootstrapPDiffWith(UncompressedFinalFile, GetFinalFilename(), Target) == false)
-      {
-        Failed("Bootstrapping of " + DestFile + " failed", NULL);
-        return;
-      }
-
-      if(Debug)
-        std::clog << "Sending to rred method: " << FinalFile << std::endl;
-
-      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 = GetKeepCompressedFileName(GetFinalFilename(), Target);
-      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 = GetKeepCompressedFileName(GetPartialFileNameFromURI(Target.URI), Target);
-        std::string const patch = GetMergeDiffsPatchFileName(PartialFile, (*I)->patch.file);
-        RemoveFile("pkgAcqIndexMergeDiffs::Done", patch);
-      }
-      RemoveFile("pkgAcqIndexMergeDiffs::Done", FinalFile);
-
-      // 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;

    }
 }
                                                                        /*}}}*/
    }
 }
                                                                        /*}}}*/


@@ -2658,20 +2678,6 @@ void pkgAcqIndex::Failed(string const &Message,pkgAcquire::MethodConfig const *
       TransactionManager->AbortTransaction();
 }
                                                                        /*}}}*/
       TransactionManager->AbortTransaction();
 }
                                                                        /*}}}*/

-// AcqIndex::ReverifyAfterIMS - Reverify index after an ims-hit                /*{{{*/
-void pkgAcqIndex::ReverifyAfterIMS()
-{
-   // update destfile to *not* include the compression extension when doing
-   // a reverify (as its uncompressed on disk already)
-   DestFile = GetCompressedFileName(Target, GetPartialFileNameFromURI(Target.URI), CurrentCompressionExtension);
-
-   // copy FinalFile into partial/ so that we check the hash again
-   string FinalFile = GetFinalFilename();
-   Stage = STAGE_DECOMPRESS_AND_VERIFY;
-   Desc.URI = "copy:" + FinalFile;
-   QueueURI(Desc);
-}
-                                                                       /*}}}*/

 // AcqIndex::Done - Finished a fetch                                   /*{{{*/
 // ---------------------------------------------------------------------
 /* This goes through a number of states.. On the initial fetch the
 // AcqIndex::Done - Finished a fetch                                   /*{{{*/
 // ---------------------------------------------------------------------
 /* This goes through a number of states.. On the initial fetch the


@@ -2688,107 +2694,93 @@ void pkgAcqIndex::Done(string const &Message,
    switch(Stage) 
    {
       case STAGE_DOWNLOAD:
    switch(Stage) 
    {
       case STAGE_DOWNLOAD:

-         StageDownloadDone(Message, Hashes, Cfg);
+         StageDownloadDone(Message);

          break;
       case STAGE_DECOMPRESS_AND_VERIFY:
          break;
       case STAGE_DECOMPRESS_AND_VERIFY:

-         StageDecompressDone(Message, Hashes, Cfg);
+         StageDecompressDone();

          break;
    }
 }
                                                                        /*}}}*/
 // AcqIndex::StageDownloadDone - Queue for decompress and verify       /*{{{*/
          break;
    }
 }
                                                                        /*}}}*/
 // AcqIndex::StageDownloadDone - Queue for decompress and verify       /*{{{*/

-void pkgAcqIndex::StageDownloadDone(string const &Message, HashStringList const &,
-                                    pkgAcquire::MethodConfig const * const)
+void pkgAcqIndex::StageDownloadDone(string const &Message)

 {
 {

+   Local = true;

    Complete = true;
 
    Complete = true;
 

-   // Handle the unzipd case
-   std::string FileName = LookupTag(Message,"Alt-Filename");
-   if (FileName.empty() == false)
+   std::string const AltFilename = LookupTag(Message,"Alt-Filename");
+   std::string Filename = LookupTag(Message,"Filename");
+
+   // we need to verify the file against the current Release file again
+   // on if-modfied-since hit to avoid a stale attack against us
+   if(StringToBool(LookupTag(Message,"IMS-Hit"),false) == true)

    {
    {

+      // copy FinalFile into partial/ so that we check the hash again
+      string const FinalFile = GetExistingFilename(GetFinalFileNameFromURI(Target.URI));
+      if (symlink(FinalFile.c_str(), DestFile.c_str()) != 0)
+        _error->WarningE("pkgAcqIndex::StageDownloadDone", "Symlinking final file %s back to %s failed", FinalFile.c_str(), DestFile.c_str());
+      else
+      {
+        EraseFileName = DestFile;
+        Filename = DestFile;
+      }

       Stage = STAGE_DECOMPRESS_AND_VERIFY;
       Stage = STAGE_DECOMPRESS_AND_VERIFY;

-      Local = true;
-      if (CurrentCompressionExtension != "uncompressed")
-        DestFile.erase(DestFile.length() - (CurrentCompressionExtension.length() + 1));
-      Desc.URI = "copy:" + FileName;
+      Desc.URI = "store:" + Filename;

       QueueURI(Desc);
       QueueURI(Desc);

-      SetActiveSubprocess("copy");
+      SetActiveSubprocess(::URI(Desc.URI).Access);

       return;
    }
       return;
    }

-   FileName = LookupTag(Message,"Filename");
-
+   // methods like file:// give us an alternative (uncompressed) file
+   else if (Target.KeepCompressed == false && AltFilename.empty() == false)
+   {
+      if (CurrentCompressionExtension != "uncompressed")
+        DestFile.erase(DestFile.length() - (CurrentCompressionExtension.length() + 1));
+      Filename = AltFilename;
+   }

    // 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
    // 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)
+   else 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;
-      }
+      // symlinking ensures that the filename can be used for compression detection
+      // that is e.g. needed for by-hash which has no extension 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
       {
       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;
-        }
+        EraseFileName = DestFile;
+        Filename = DestFile;

       }
    }
       }
    }

-   else
-      EraseFileName = FileName;
-
-   // we need to verify the file against the current Release file again
-   // on if-modfied-since hit to avoid a stale attack against us
-   if(StringToBool(LookupTag(Message,"IMS-Hit"),false) == true)
-   {
-      // The files timestamp matches, reverify by copy into partial/
-      EraseFileName = "";
-      ReverifyAfterIMS();
-      return;
-   }

 
 

-   string decompProg = "store";
-   if (Target.KeepCompressed == true)
-   {
-      DestFile = "/dev/null";
-      EraseFileName.clear();
-   }
+   Stage = STAGE_DECOMPRESS_AND_VERIFY;
+   DestFile = GetKeepCompressedFileName(GetPartialFileNameFromURI(Target.URI), Target);
+   if (Filename != DestFile && flExtension(Filename) == flExtension(DestFile))
+      Desc.URI = "copy:" + Filename;

    else
    else

+      Desc.URI = "store:" + Filename;
+   if (DestFile == Filename)

    {
       if (CurrentCompressionExtension == "uncompressed")
    {
       if (CurrentCompressionExtension == "uncompressed")

-        decompProg = "copy";
-      else
-        DestFile.erase(DestFile.length() - (CurrentCompressionExtension.length() + 1));
+        return StageDecompressDone();
+      DestFile = "/dev/null";

    }
 
    }
 

+   if (EraseFileName.empty())
+      EraseFileName = Filename;
+

    // queue uri for the next stage
    // queue uri for the next stage

-   Stage = STAGE_DECOMPRESS_AND_VERIFY;
-   Desc.URI = decompProg + ":" + FileName;

    QueueURI(Desc);
    QueueURI(Desc);

-   SetActiveSubprocess(decompProg);
+   SetActiveSubprocess(::URI(Desc.URI).Access);

 }
                                                                        /*}}}*/
 // AcqIndex::StageDecompressDone - Final verification                  /*{{{*/
 }
                                                                        /*}}}*/
 // AcqIndex::StageDecompressDone - Final verification                  /*{{{*/

-void pkgAcqIndex::StageDecompressDone(string const &,
-                                      HashStringList const &,
-                                      pkgAcquire::MethodConfig const * const)
+void pkgAcqIndex::StageDecompressDone()

 {
 {

-   if (Target.KeepCompressed == true && DestFile == "/dev/null")
-      DestFile = GetPartialFileNameFromURI(Target.URI + '.' + CurrentCompressionExtension);
+   if (DestFile == "/dev/null")
+      DestFile = GetKeepCompressedFileName(GetPartialFileNameFromURI(Target.URI), Target);

 
    // Done, queue for rename on transaction finished
    TransactionManager->TransactionStageCopy(this, DestFile, GetFinalFilename());
 
    // Done, queue for rename on transaction finished
    TransactionManager->TransactionStageCopy(this, DestFile, GetFinalFilename());

-   return;

 }
                                                                        /*}}}*/
 pkgAcqIndex::~pkgAcqIndex() {}
 }
                                                                        /*}}}*/
 pkgAcqIndex::~pkgAcqIndex() {}