Adding upstream version 2.6.1.upstream/2.6.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1181 insertions, 0 deletions

diff --git a/ftparchive/writer.cc b/ftparchive/writer.cc
new file mode 100644
index 0000000..ae427b1
--- /dev/null
+++ b/ftparchive/writer.cc
@@ -0,0 +1,1181 @@
+// -*- mode: cpp; mode: fold -*-
+// Description								/*{{{*/
+/* ######################################################################
+
+   Writer 
+   
+   The file writer classes. These write various types of output, sources,
+   packages and contents.
+   
+   ##################################################################### */
+									/*}}}*/
+// Include Files							/*{{{*/
+#include <config.h>
+
+#include <apt-pkg/configuration.h>
+#include <apt-pkg/debfile.h>
+#include <apt-pkg/deblistparser.h>
+#include <apt-pkg/error.h>
+#include <apt-pkg/fileutl.h>
+#include <apt-pkg/gpgv.h>
+#include <apt-pkg/hashes.h>
+#include <apt-pkg/pkgcache.h>
+#include <apt-pkg/strutl.h>
+#include <apt-pkg/tagfile-keys.h>
+#include <apt-pkg/tagfile.h>
+
+#include <algorithm>
+#include <ctime>
+#include <iomanip>
+#include <iostream>
+#include <memory>
+#include <sstream>
+#include <utility>
+#include <ctype.h>
+#include <fnmatch.h>
+#include <ftw.h>
+#include <locale.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "apt-ftparchive.h"
+#include "byhash.h"
+#include "cachedb.h"
+#include "multicompress.h"
+#include "writer.h"
+
+#include <apti18n.h>
+									/*}}}*/
+using namespace std;
+FTWScanner *FTWScanner::Owner;
+
+// ConfigToDoHashes - which hashes to generate				/*{{{*/
+static void SingleConfigToDoHashes(unsigned int &DoHashes, std::string const &Conf, unsigned int const Flag)
+{
+   if (_config->FindB(Conf, (DoHashes & Flag) == Flag) == true)
+      DoHashes |= Flag;
+   else
+      DoHashes &= ~Flag;
+}
+static void ConfigToDoHashes(unsigned int &DoHashes, std::string const &Conf)
+{
+   SingleConfigToDoHashes(DoHashes, Conf + "::MD5", Hashes::MD5SUM);
+   SingleConfigToDoHashes(DoHashes, Conf + "::SHA1", Hashes::SHA1SUM);
+   SingleConfigToDoHashes(DoHashes, Conf + "::SHA256", Hashes::SHA256SUM);
+   SingleConfigToDoHashes(DoHashes, Conf + "::SHA512", Hashes::SHA512SUM);
+}
+									/*}}}*/
+
+// FTWScanner::FTWScanner - Constructor					/*{{{*/
+FTWScanner::FTWScanner(FileFd * const GivenOutput, string const &Arch, bool const IncludeArchAll)
+   : Arch(Arch), IncludeArchAll(IncludeArchAll), DoHashes(~0)
+{
+   if (GivenOutput == NULL)
+   {
+      Output = new FileFd;
+      OwnsOutput = true;
+      Output->OpenDescriptor(STDOUT_FILENO, FileFd::WriteOnly, false);
+   }
+   else
+   {
+      Output = GivenOutput;
+      OwnsOutput = false;
+   }
+   ErrorPrinted = false;
+   NoLinkAct = !_config->FindB("APT::FTPArchive::DeLinkAct",true);
+   ConfigToDoHashes(DoHashes, "APT::FTPArchive");
+}
+									/*}}}*/
+FTWScanner::~FTWScanner()
+{
+   if (Output != NULL && OwnsOutput)
+      delete Output;
+}
+// FTWScanner::Scanner - FTW Scanner					/*{{{*/
+// ---------------------------------------------------------------------
+/* This is the FTW scanner, it processes each directory element in the
+   directory tree. */
+int FTWScanner::ScannerFTW(const char *File,const struct stat * /*sb*/,int Flag)
+{
+   if (Flag == FTW_DNR)
+   {
+      Owner->NewLine(1);
+      ioprintf(c1out, _("W: Unable to read directory %s\n"), File);
+   }   
+   if (Flag == FTW_NS)
+   {
+      Owner->NewLine(1);
+      ioprintf(c1out, _("W: Unable to stat %s\n"), File);
+   }   
+   if (Flag != FTW_F)
+      return 0;
+
+   return ScannerFile(File, true);
+}
+									/*}}}*/
+static bool FileMatchesPatterns(char const *const File, std::vector<std::string> const &Patterns) /*{{{*/
+{
+   const char *LastComponent = strrchr(File, '/');
+   if (LastComponent == nullptr)
+      LastComponent = File;
+   else
+      ++LastComponent;
+
+   return std::any_of(Patterns.cbegin(), Patterns.cend(), [&](std::string const &pattern) {
+      return fnmatch(pattern.c_str(), LastComponent, 0) == 0;
+   });
+}
+									/*}}}*/
+int FTWScanner::ScannerFile(const char *const File, bool const ReadLink) /*{{{*/
+{
+   if (FileMatchesPatterns(File, Owner->Patterns) == false)
+      return 0;
+
+   Owner->FilesToProcess.emplace_back(File, ReadLink);
+   return 0;
+}
+									/*}}}*/
+int FTWScanner::ProcessFile(const char *const File, bool const ReadLink) /*{{{*/
+{
+   /* Process it. If the file is a link then resolve it into an absolute
+      name.. This works best if the directory components the scanner are
+      given are not links themselves. */
+   char Jnk[2];
+   char *RealPath = NULL;
+   Owner->OriginalPath = File;
+   if (ReadLink &&
+       readlink(File,Jnk,sizeof(Jnk)) != -1 &&
+       (RealPath = realpath(File,NULL)) != 0)
+   {
+      Owner->DoPackage(RealPath);
+      free(RealPath);
+   }
+   else
+      Owner->DoPackage(File);
+   
+   if (_error->empty() == false)
+   {
+      // Print any errors or warnings found
+      string Err;
+      bool SeenPath = false;
+      while (_error->empty() == false)
+      {
+	 Owner->NewLine(1);
+	 
+	 bool const Type = _error->PopMessage(Err);
+	 if (Type == true)
+	    cerr << _("E: ") << Err << endl;
+	 else
+	    cerr << _("W: ") << Err << endl;
+	 
+	 if (Err.find(File) != string::npos)
+	    SeenPath = true;
+      }      
+      
+      if (SeenPath == false)
+	 cerr << _("E: Errors apply to file ") << "'" << File << "'" << endl;
+      return 0;
+   }
+   
+   return 0;
+}
+									/*}}}*/
+// FTWScanner::RecursiveScan - Just scan a directory tree		/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool FTWScanner::RecursiveScan(string const &Dir)
+{
+   /* If noprefix is set then jam the scan root in, so we don't generate
+      link followed paths out of control */
+   if (InternalPrefix.empty() == true)
+   {
+      char *RealPath = nullptr;
+      if ((RealPath = realpath(Dir.c_str(), nullptr)) == 0)
+	 return _error->Errno("realpath",_("Failed to resolve %s"),Dir.c_str());
+      InternalPrefix = RealPath;
+      free(RealPath);
+   }
+   
+   // Do recursive directory searching
+   Owner = this;
+   int const Res = ftw(Dir.c_str(),ScannerFTW,30);
+   
+   // Error treewalking?
+   if (Res != 0)
+   {
+      if (_error->PendingError() == false)
+	 _error->Errno("ftw",_("Tree walking failed"));
+      return false;
+   }
+
+   using PairType = decltype(*FilesToProcess.cbegin());
+   std::sort(FilesToProcess.begin(), FilesToProcess.end(), [](PairType a, PairType b) {
+      return a.first < b.first;
+   });
+   if (not std::all_of(FilesToProcess.cbegin(), FilesToProcess.cend(), [](auto &&it) { return ProcessFile(it.first.c_str(), it.second) == 0; }))
+      return false;
+   FilesToProcess.clear();
+   return true;
+}
+									/*}}}*/
+// FTWScanner::LoadFileList - Load the file list from a file		/*{{{*/
+// ---------------------------------------------------------------------
+/* This is an alternative to using FTW to locate files, it reads the list
+   of files from another file. */
+bool FTWScanner::LoadFileList(string const &Dir, string const &File)
+{
+   /* If noprefix is set then jam the scan root in, so we don't generate
+      link followed paths out of control */
+   if (InternalPrefix.empty() == true)
+   {
+      char *RealPath = nullptr;
+      if ((RealPath = realpath(Dir.c_str(), nullptr)) == 0)
+	 return _error->Errno("realpath",_("Failed to resolve %s"),Dir.c_str());
+      InternalPrefix = RealPath;
+      free(RealPath);
+   }
+   
+   Owner = this;
+   FILE *List = fopen(File.c_str(),"r");
+   if (List == 0)
+      return _error->Errno("fopen",_("Failed to open %s"),File.c_str());
+   
+   /* We are a tad tricky here.. We prefix the buffer with the directory
+      name, that way if we need a full path with just use line.. Sneaky and
+      fully evil. */
+   char Line[1000];
+   char *FileStart;
+   if (Dir.empty() == true || Dir.end()[-1] != '/')
+      FileStart = Line + snprintf(Line,sizeof(Line),"%s/",Dir.c_str());
+   else
+      FileStart = Line + snprintf(Line,sizeof(Line),"%s",Dir.c_str());   
+   while (fgets(FileStart,sizeof(Line) - (FileStart - Line),List) != 0)
+   {
+      char *FileName = _strstrip(FileStart);
+      if (FileName[0] == 0)
+	 continue;
+	 
+      if (FileName[0] != '/')
+      {
+	 if (FileName != FileStart)
+	    memmove(FileStart,FileName,strlen(FileStart));
+	 FileName = Line;
+      }
+      
+#if 0
+      struct stat St;
+      int Flag = FTW_F;
+      if (stat(FileName,&St) != 0)
+	 Flag = FTW_NS;
+#endif
+      if (FileMatchesPatterns(FileName, Patterns) == false)
+	 continue;
+
+      if (ProcessFile(FileName, false) != 0)
+	 break;
+   }
+  
+   fclose(List);
+   return true;
+}
+									/*}}}*/
+// FTWScanner::Delink - Delink symlinks					/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool FTWScanner::Delink(string &FileName,const char *OriginalPath,
+			unsigned long long &DeLinkBytes,
+			unsigned long long const &FileSize)
+{
+   // See if this isn't an internally prefix'd file name.
+   if (InternalPrefix.empty() == false &&
+       InternalPrefix.length() < FileName.length() && 
+       stringcmp(FileName.begin(),FileName.begin() + InternalPrefix.length(),
+		 InternalPrefix.begin(),InternalPrefix.end()) != 0)
+   {
+      if (DeLinkLimit != 0 && DeLinkBytes/1024 < DeLinkLimit)
+      {
+	 // Tidy up the display
+	 if (DeLinkBytes == 0)
+	    cout << endl;
+	 
+	 NewLine(1);
+	 ioprintf(c1out, _(" DeLink %s [%s]\n"), (OriginalPath + InternalPrefix.length()),
+		    SizeToStr(FileSize).c_str());
+	 c1out << flush;
+	 
+	 if (NoLinkAct == false)
+	 {
+	    char OldLink[400];
+	    if (readlink(OriginalPath,OldLink,sizeof(OldLink)) == -1)
+	       _error->Errno("readlink",_("Failed to readlink %s"),OriginalPath);
+	    else
+	    {
+	       if (RemoveFile("FTWScanner::Delink", OriginalPath))
+	       {
+		  if (link(FileName.c_str(),OriginalPath) != 0)
+		  {
+		     // Panic! Restore the symlink
+		     if (symlink(OldLink,OriginalPath) != 0)
+                        _error->Errno("symlink", "failed to restore symlink");
+		     return _error->Errno("link",_("*** Failed to link %s to %s"),
+					  FileName.c_str(),
+					  OriginalPath);
+		  }	       
+	       }
+	    }	    
+	 }
+	 
+	 DeLinkBytes += FileSize;
+	 if (DeLinkBytes/1024 >= DeLinkLimit)
+	    ioprintf(c1out, _(" DeLink limit of %sB hit.\n"), SizeToStr(DeLinkBytes).c_str());      
+      }
+      
+      FileName = OriginalPath;
+   }
+   
+   return true;
+}
+									/*}}}*/
+// FTWScanner::SetExts - Set extensions to support                      /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool FTWScanner::SetExts(string const &Vals)
+{
+   ClearPatterns();
+   string::size_type Start = 0;
+   while (Start <= Vals.length()-1)
+   {
+      string::size_type const Space = Vals.find(' ',Start);
+      string::size_type const Length = ((Space == string::npos) ? Vals.length() : Space) - Start;
+      if ( Arch.empty() == false )
+      {
+	 AddPattern(string("*_") + Arch + Vals.substr(Start, Length));
+	 if (IncludeArchAll == true && Arch != "all")
+	    AddPattern(string("*_all") + Vals.substr(Start, Length));
+      }
+      else
+	 AddPattern(string("*") + Vals.substr(Start, Length));
+
+      Start += Length + 1;
+   }
+
+   return true;
+}
+									/*}}}*/
+
+// PackagesWriter::PackagesWriter - Constructor				/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+PackagesWriter::PackagesWriter(FileFd * const GivenOutput, TranslationWriter * const transWriter,
+      string const &DB,string const &Overrides,string const &ExtOverrides,
+      string const &Arch, bool const IncludeArchAll) :
+   FTWScanner(GivenOutput, Arch, IncludeArchAll), Db(DB), Stats(Db.Stats), TransWriter(transWriter)
+{
+   SetExts(".deb .ddeb .udeb");
+   DeLinkLimit = 0;
+
+   // Process the command line options
+   ConfigToDoHashes(DoHashes, "APT::FTPArchive::Packages");
+   DoAlwaysStat = _config->FindB("APT::FTPArchive::AlwaysStat", false);
+   DoContents = _config->FindB("APT::FTPArchive::Contents",true);
+   NoOverride = _config->FindB("APT::FTPArchive::NoOverrideMsg",false);
+   LongDescription = _config->FindB("APT::FTPArchive::LongDescription",true);
+
+   if (Db.Loaded() == false)
+      DoContents = false;
+
+   // Read the override file
+   if (Overrides.empty() == false && Over.ReadOverride(Overrides) == false)
+      return;
+   else
+      NoOverride = true;
+
+   if (ExtOverrides.empty() == false)
+      Over.ReadExtraOverride(ExtOverrides);
+
+   _error->DumpErrors();
+}
+                                                                        /*}}}*/
+// PackagesWriter::DoPackage - Process a single package			/*{{{*/
+// ---------------------------------------------------------------------
+/* This method takes a package and gets its control information and 
+   MD5, SHA1 and SHA256 then writes out a control record with the proper fields 
+   rewritten and the path/size/hash appended. */
+bool PackagesWriter::DoPackage(string FileName)
+{      
+   // Pull all the data we need form the DB
+   if (Db.GetFileInfo(FileName,
+	    true, /* DoControl */
+	    DoContents,
+	    true, /* GenContentsOnly */
+	    false, /* DoSource */
+	    DoHashes, DoAlwaysStat) == false)
+   {
+     return false;
+   }
+
+   unsigned long long FileSize = Db.GetFileSize();
+   if (Delink(FileName,OriginalPath,Stats.DeLinkBytes,FileSize) == false)
+      return false;
+   
+   // Lookup the override information
+   pkgTagSection &Tags = Db.Control.Section;
+   auto const Package = Tags.Find(pkgTagSection::Key::Package).to_string();
+   string Architecture;
+   // if we generate a Packages file for a given arch, we use it to
+   // look for overrides. if we run in "simple" mode without the 
+   // "Architectures" variable in the config we use the architecture value
+   // from the deb file
+   if(Arch != "")
+      Architecture = Arch;
+   else
+      Architecture = Tags.Find(pkgTagSection::Key::Architecture).to_string();
+   unique_ptr<Override::Item> OverItem(Over.GetItem(Package, Architecture));
+
+   if (Package.empty() == true)
+      return _error->Error(_("Archive had no package field"));
+
+   // If we need to do any rewriting of the header do it now..
+   if (OverItem.get() == 0)
+   {
+      if (NoOverride == false)
+      {
+	 NewLine(1);
+	 ioprintf(c1out, _("  %s has no override entry\n"), Package.c_str());
+      }
+
+      OverItem = unique_ptr<Override::Item>(new Override::Item);
+      OverItem->FieldOverride["Section"] = Tags.Find(pkgTagSection::Key::Section).to_string();
+      OverItem->Priority = Tags.Find(pkgTagSection::Key::Priority).to_string();
+   }
+
+   // Strip the DirStrip prefix from the FileName and add the PathPrefix
+   string NewFileName;
+   if (DirStrip.empty() == false &&
+       FileName.length() > DirStrip.length() &&
+       stringcmp(FileName.begin(),FileName.begin() + DirStrip.length(),
+		 DirStrip.begin(),DirStrip.end()) == 0)
+      NewFileName = string(FileName.begin() + DirStrip.length(),FileName.end());
+   else 
+      NewFileName = FileName;
+   if (PathPrefix.empty() == false)
+      NewFileName = flCombine(PathPrefix,NewFileName);
+
+   /* Configuration says we don't want to include the long Description
+      in the package file - instead we want to ship a separated file */
+   string desc;
+   if (LongDescription == false) {
+      desc = Tags.Find(pkgTagSection::Key::Description).to_string().append("\n");
+      OverItem->FieldOverride["Description"] = desc.substr(0, desc.find('\n')).c_str();
+   }
+
+   // This lists all the changes to the fields we are going to make.
+   std::vector<pkgTagSection::Tag> Changes;
+   Changes.push_back(pkgTagSection::Tag::Rewrite("Size", std::to_string(FileSize)));
+
+   for (HashStringList::const_iterator hs = Db.HashesList.begin(); hs != Db.HashesList.end(); ++hs)
+   {
+      if (hs->HashType() == "MD5Sum")
+	 Changes.push_back(pkgTagSection::Tag::Rewrite("MD5sum", hs->HashValue()));
+      else if (hs->HashType() == "Checksum-FileSize")
+	 continue;
+      else
+	 Changes.push_back(pkgTagSection::Tag::Rewrite(hs->HashType(), hs->HashValue()));
+   }
+   Changes.push_back(pkgTagSection::Tag::Rewrite("Filename", NewFileName));
+   Changes.push_back(pkgTagSection::Tag::Rewrite("Priority", OverItem->Priority));
+   Changes.push_back(pkgTagSection::Tag::Remove("Status"));
+
+   string DescriptionMd5;
+   if (LongDescription == false) {
+      Hashes descmd5(Hashes::MD5SUM);
+      descmd5.Add(desc.c_str());
+      DescriptionMd5 = descmd5.GetHashString(Hashes::MD5SUM).HashValue();
+      Changes.push_back(pkgTagSection::Tag::Rewrite("Description-md5", DescriptionMd5));
+      if (TransWriter != NULL)
+	 TransWriter->DoPackage(Package, desc, DescriptionMd5);
+   }
+
+   // Rewrite the maintainer field if necessary
+   bool MaintFailed;
+   string NewMaint = OverItem->SwapMaint(Tags.Find(pkgTagSection::Key::Maintainer).to_string(), MaintFailed);
+   if (MaintFailed == true)
+   {
+      if (NoOverride == false)
+      {
+	 NewLine(1);
+	 ioprintf(c1out, _("  %s maintainer is %s not %s\n"),
+	       Package.c_str(), Tags.Find(pkgTagSection::Key::Maintainer).to_string().c_str(), OverItem->OldMaint.c_str());
+      }
+   }
+
+   if (NewMaint.empty() == false)
+      Changes.push_back(pkgTagSection::Tag::Rewrite("Maintainer", NewMaint));
+
+   for (map<string,string>::const_iterator I = OverItem->FieldOverride.begin();
+        I != OverItem->FieldOverride.end(); ++I)
+      Changes.push_back(pkgTagSection::Tag::Rewrite(I->first, I->second));
+
+   // Rewrite and store the fields.
+   if (Tags.Write(*Output, TFRewritePackageOrder, Changes) == false ||
+	 Output->Write("\n", 1) == false)
+      return false;
+
+   return Db.Finish();
+}
+									/*}}}*/
+PackagesWriter::~PackagesWriter()					/*{{{*/
+{
+}
+									/*}}}*/
+
+// TranslationWriter::TranslationWriter - Constructor			/*{{{*/
+// ---------------------------------------------------------------------
+/* Create a Translation-Master file for this Packages file */
+TranslationWriter::TranslationWriter(string const &File, string const &TransCompress,
+					mode_t const &Permissions) : Comp(NULL), Output(NULL)
+{
+   if (File.empty() == true)
+      return;
+
+   Comp = new MultiCompress(File, TransCompress, Permissions);
+   Output = &Comp->Input;
+}
+									/*}}}*/
+// TranslationWriter::DoPackage - Process a single package		/*{{{*/
+// ---------------------------------------------------------------------
+/* Create a Translation-Master file for this Packages file */
+bool TranslationWriter::DoPackage(string const &Pkg, string const &Desc,
+				  string const &MD5)
+{
+   if (Output == NULL)
+      return true;
+
+   // Different archs can include different versions and therefore
+   // different descriptions - so we need to check for both name and md5.
+   string const Record = Pkg + ":" + MD5;
+
+   if (Included.find(Record) != Included.end())
+      return true;
+
+   std::string out;
+   strprintf(out, "Package: %s\nDescription-md5: %s\nDescription-en: %s\n",
+	   Pkg.c_str(), MD5.c_str(), Desc.c_str());
+   Output->Write(out.c_str(), out.length());
+
+   Included.insert(Record);
+   return true;
+}
+									/*}}}*/
+// TranslationWriter::~TranslationWriter - Destructor			/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+TranslationWriter::~TranslationWriter()
+{
+   if (Comp != NULL)
+      delete Comp;
+}
+									/*}}}*/
+
+// SourcesWriter::SourcesWriter - Constructor				/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+SourcesWriter::SourcesWriter(FileFd * const GivenOutput, string const &DB, string const &BOverrides,string const &SOverrides,
+			     string const &ExtOverrides) :
+   FTWScanner(GivenOutput), Db(DB), Stats(Db.Stats)
+{
+   AddPattern("*.dsc");
+   DeLinkLimit = 0;
+   Buffer = 0;
+   BufSize = 0;
+   
+   // Process the command line options
+   ConfigToDoHashes(DoHashes, "APT::FTPArchive::Sources");
+   NoOverride = _config->FindB("APT::FTPArchive::NoOverrideMsg",false);
+   DoAlwaysStat = _config->FindB("APT::FTPArchive::AlwaysStat", false);
+
+   // Read the override file
+   if (BOverrides.empty() == false && BOver.ReadOverride(BOverrides) == false)
+      return;
+   else
+      NoOverride = true;
+
+   // WTF?? The logic above: if we can't read binary overrides, don't even try
+   // reading source overrides. if we can read binary overrides, then say there
+   // are no overrides. THIS MAKES NO SENSE! -- ajt@d.o, 2006/02/28
+
+   if (ExtOverrides.empty() == false)
+      SOver.ReadExtraOverride(ExtOverrides);
+   
+   if (SOverrides.empty() == false && FileExists(SOverrides) == true)
+      SOver.ReadOverride(SOverrides,true);
+}
+									/*}}}*/
+// SourcesWriter::DoPackage - Process a single package			/*{{{*/
+static std::string getDscHash(unsigned int const DoHashes,
+      Hashes::SupportedHashes const DoIt, pkgTagSection &Tags, pkgTagSection::Key const FieldKey,
+      HashString const * const Hash, unsigned long long Size, std::string const &FileName)
+{
+   if ((DoHashes & DoIt) != DoIt || not Tags.Exists(FieldKey) || Hash == nullptr)
+      return "";
+   std::ostringstream out;
+   out << "\n " << Hash->HashValue() << " " << std::to_string(Size) << " " << FileName
+      << "\n " << Tags.Find(FieldKey).to_string();
+   return out.str();
+}
+bool SourcesWriter::DoPackage(string FileName)
+{
+   // Pull all the data we need form the DB
+   if (Db.GetFileInfo(FileName,
+	    false, /* DoControl */
+	    false, /* DoContents */
+	    false, /* GenContentsOnly */
+	    true, /* DoSource */
+	    DoHashes, DoAlwaysStat) == false)
+   {
+      return false;
+   }
+
+   // we need to perform a "write" here (this is what finish is doing)
+   // because the call to Db.GetFileInfo() in the loop will change
+   // the "db cursor"
+   Db.Finish();
+
+   pkgTagSection Tags;
+   if (Tags.Scan(Db.Dsc.Data.c_str(), Db.Dsc.Data.length()) == false)
+      return _error->Error("Could not find a record in the DSC '%s'",FileName.c_str());
+
+   if (not Tags.Exists(pkgTagSection::Key::Source))
+      return _error->Error("Could not find a Source entry in the DSC '%s'",FileName.c_str());
+   Tags.Trim();
+
+   // Lookup the override information, finding first the best priority.
+   string BestPrio;
+   auto const Bins = Tags.Find(pkgTagSection::Key::Binary);
+   char Buffer[Bins.length() + 1];
+   unique_ptr<Override::Item> OverItem(nullptr);
+   if (Bins.empty() == false)
+   {
+      strncpy(Buffer, Bins.data(), Bins.length());
+      Buffer[Bins.length()] = '\0';
+
+      // Ignore too-long errors.
+      char *BinList[400];
+      TokSplitString(',',Buffer,BinList,sizeof(BinList)/sizeof(BinList[0]));
+      
+      // Look at all the binaries
+      unsigned char BestPrioV = pkgCache::State::Extra;
+      for (unsigned I = 0; BinList[I] != 0; I++)
+      {
+	 unique_ptr<Override::Item> Itm(BOver.GetItem(BinList[I]));
+	 if (Itm.get() == 0)
+	    continue;
+
+	 unsigned char NewPrioV = debListParser::GetPrio(Itm->Priority);
+	 if (NewPrioV < BestPrioV || BestPrio.empty() == true)
+	 {
+	    BestPrioV = NewPrioV;
+	    BestPrio = Itm->Priority;
+	 }	 
+
+	 if (OverItem.get() == 0)
+	    OverItem = std::move(Itm);
+      }
+   }
+   
+   // If we need to do any rewriting of the header do it now..
+   if (OverItem.get() == 0)
+   {
+      if (NoOverride == false)
+      {
+	 NewLine(1);
+	 ioprintf(c1out, _("  %s has no override entry\n"), Tags.Find(pkgTagSection::Key::Source).to_string().c_str());
+      }
+      
+      OverItem.reset(new Override::Item);
+   }
+   
+   struct stat St;
+   if (stat(FileName.c_str(), &St) != 0)
+      return _error->Errno("fstat","Failed to stat %s",FileName.c_str());
+
+   auto const Package = Tags.Find(pkgTagSection::Key::Source).to_string();
+   unique_ptr<Override::Item> SOverItem(SOver.GetItem(Package));
+   // const unique_ptr<Override::Item> autoSOverItem(SOverItem);
+   if (SOverItem.get() == 0)
+   {
+      ioprintf(c1out, _("  %s has no source override entry\n"), Package.c_str());
+      SOverItem = unique_ptr<Override::Item>(BOver.GetItem(Package));
+      if (SOverItem.get() == 0)
+      {
+        ioprintf(c1out, _("  %s has no binary override entry either\n"), Package.c_str());
+	 SOverItem = unique_ptr<Override::Item>(new Override::Item);
+	 *SOverItem = *OverItem;
+      }
+   }
+
+   // Add the dsc to the files hash list
+   string const strippedName = flNotDir(FileName);
+   std::string const Files = getDscHash(DoHashes, Hashes::MD5SUM, Tags, pkgTagSection::Key::Files, Db.HashesList.find("MD5Sum"), St.st_size, strippedName);
+   std::string ChecksumsSha1 = getDscHash(DoHashes, Hashes::SHA1SUM, Tags, pkgTagSection::Key::Checksums_Sha1, Db.HashesList.find("SHA1"), St.st_size, strippedName);
+   std::string ChecksumsSha256 = getDscHash(DoHashes, Hashes::SHA256SUM, Tags, pkgTagSection::Key::Checksums_Sha256, Db.HashesList.find("SHA256"), St.st_size, strippedName);
+   std::string ChecksumsSha512 = getDscHash(DoHashes, Hashes::SHA512SUM, Tags, pkgTagSection::Key::Checksums_Sha512, Db.HashesList.find("SHA512"), St.st_size, strippedName);
+
+   // Strip the DirStrip prefix from the FileName and add the PathPrefix
+   string NewFileName;
+   if (DirStrip.empty() == false &&
+       FileName.length() > DirStrip.length() &&
+       stringcmp(DirStrip,OriginalPath,OriginalPath + DirStrip.length()) == 0)
+      NewFileName = string(OriginalPath + DirStrip.length());
+   else 
+      NewFileName = OriginalPath;
+   if (PathPrefix.empty() == false)
+      NewFileName = flCombine(PathPrefix,NewFileName);
+
+   string Directory = flNotFile(OriginalPath);
+
+   // Perform operation over all of the files
+   string ParseJnk;
+   const char *C = Files.c_str();
+   char *RealPath = NULL;
+   for (;isspace(*C); C++);
+   while (*C != 0)
+   {
+      // Parse each of the elements
+      if (ParseQuoteWord(C,ParseJnk) == false ||
+	  ParseQuoteWord(C,ParseJnk) == false ||
+	  ParseQuoteWord(C,ParseJnk) == false)
+	 return _error->Error("Error parsing file record");
+
+      string OriginalPath = Directory + ParseJnk;
+
+      // Add missing hashes to source files
+      if (((DoHashes & Hashes::SHA1SUM) == Hashes::SHA1SUM && not Tags.Exists(pkgTagSection::Key::Checksums_Sha1)) ||
+          ((DoHashes & Hashes::SHA256SUM) == Hashes::SHA256SUM && not Tags.Exists(pkgTagSection::Key::Checksums_Sha256)) ||
+          ((DoHashes & Hashes::SHA512SUM) == Hashes::SHA512SUM && not Tags.Exists(pkgTagSection::Key::Checksums_Sha512)))
+      {
+         if (Db.GetFileInfo(OriginalPath,
+                            false, /* DoControl */
+                            false, /* DoContents */
+                            false, /* GenContentsOnly */
+                            false, /* DoSource */
+                            DoHashes,
+                            DoAlwaysStat) == false)
+         {
+            return _error->Error("Error getting file info");
+         }
+
+         for (HashStringList::const_iterator hs = Db.HashesList.begin(); hs != Db.HashesList.end(); ++hs)
+	 {
+	    if (hs->HashType() == "MD5Sum" || hs->HashType() == "Checksum-FileSize")
+	       continue;
+	    pkgTagSection::Key fieldkey;
+	    std::string * out;
+	    if (hs->HashType() == "SHA1")
+	    {
+	       fieldkey = pkgTagSection::Key::Checksums_Sha1;
+	       out = &ChecksumsSha1;
+	    }
+	    else if (hs->HashType() == "SHA256")
+	    {
+	       fieldkey = pkgTagSection::Key::Checksums_Sha256;
+	       out = &ChecksumsSha256;
+	    }
+	    else if (hs->HashType() == "SHA512")
+	    {
+	       fieldkey = pkgTagSection::Key::Checksums_Sha512;
+	       out = &ChecksumsSha512;
+	    }
+	    else
+	    {
+	       _error->Warning("Ignoring unknown Checksumtype %s in SourcesWriter::DoPackages", hs->HashType().c_str());
+	       continue;
+	    }
+	    if (Tags.Exists(fieldkey))
+	       continue;
+	    std::ostringstream streamout;
+	    streamout << "\n " << hs->HashValue() << " " << std::to_string(Db.GetFileSize()) << " " << ParseJnk;
+	    out->append(streamout.str());
+	 }
+
+	 // write back the GetFileInfo() stats data
+	 Db.Finish();
+      }
+
+      // Perform the delinking operation
+      char Jnk[2];
+
+      if (readlink(OriginalPath.c_str(),Jnk,sizeof(Jnk)) != -1 &&
+	  (RealPath = realpath(OriginalPath.c_str(),NULL)) != 0)
+      {
+	 string RP = RealPath;
+	 free(RealPath);
+	 if (Delink(RP,OriginalPath.c_str(),Stats.DeLinkBytes,St.st_size) == false)
+	    return false;
+      }
+   }
+
+   Directory = flNotFile(NewFileName);
+   if (Directory.length() > 2)
+      Directory.erase(Directory.end()-1);
+
+   // This lists all the changes to the fields we are going to make.
+   // (5 hardcoded + checksums + maintainer + end marker)
+   std::vector<pkgTagSection::Tag> Changes;
+
+   Changes.push_back(pkgTagSection::Tag::Remove("Source"));
+   Changes.push_back(pkgTagSection::Tag::Rewrite("Package", Package));
+   if (Files.empty() == false)
+      Changes.push_back(pkgTagSection::Tag::Rewrite("Files", Files));
+   else
+      Changes.push_back(pkgTagSection::Tag::Remove("Files"));
+   if (ChecksumsSha1.empty() == false)
+      Changes.push_back(pkgTagSection::Tag::Rewrite("Checksums-Sha1", ChecksumsSha1));
+   else
+      Changes.push_back(pkgTagSection::Tag::Remove("Checksums-Sha1"));
+   if (ChecksumsSha256.empty() == false)
+      Changes.push_back(pkgTagSection::Tag::Rewrite("Checksums-Sha256", ChecksumsSha256));
+   else
+      Changes.push_back(pkgTagSection::Tag::Remove("Checksums-Sha256"));
+   if (ChecksumsSha512.empty() == false)
+      Changes.push_back(pkgTagSection::Tag::Rewrite("Checksums-Sha512", ChecksumsSha512));
+   else
+      Changes.push_back(pkgTagSection::Tag::Remove("Checksums-Sha512"));
+   if (Directory != "./")
+      Changes.push_back(pkgTagSection::Tag::Rewrite("Directory", Directory));
+   Changes.push_back(pkgTagSection::Tag::Rewrite("Priority", BestPrio));
+   Changes.push_back(pkgTagSection::Tag::Remove("Status"));
+
+   // Rewrite the maintainer field if necessary
+   bool MaintFailed;
+   string NewMaint = OverItem->SwapMaint(Tags.Find(pkgTagSection::Key::Maintainer).to_string(), MaintFailed);
+   if (MaintFailed == true)
+   {
+      if (NoOverride == false)
+      {
+	 NewLine(1);
+	 ioprintf(c1out, _("  %s maintainer is %s not %s\n"), Package.c_str(),
+	       Tags.Find(pkgTagSection::Key::Maintainer).to_string().c_str(), OverItem->OldMaint.c_str());
+      }
+   }
+   if (NewMaint.empty() == false)
+      Changes.push_back(pkgTagSection::Tag::Rewrite("Maintainer", NewMaint.c_str()));
+
+   for (map<string,string>::const_iterator I = SOverItem->FieldOverride.begin();
+        I != SOverItem->FieldOverride.end(); ++I)
+      Changes.push_back(pkgTagSection::Tag::Rewrite(I->first, I->second));
+
+   // Rewrite and store the fields.
+   if (Tags.Write(*Output, TFRewriteSourceOrder, Changes) == false ||
+	 Output->Write("\n", 1) == false)
+      return false;
+
+   Stats.Packages++;
+   
+   return true;
+}
+									/*}}}*/
+
+// ContentsWriter::ContentsWriter - Constructor				/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+ContentsWriter::ContentsWriter(FileFd * const GivenOutput, string const &DB,
+      string const &Arch, bool const IncludeArchAll) :
+		    FTWScanner(GivenOutput, Arch, IncludeArchAll), Db(DB), Stats(Db.Stats)
+
+{
+   SetExts(".deb");
+}
+									/*}}}*/
+// ContentsWriter::DoPackage - Process a single package			/*{{{*/
+// ---------------------------------------------------------------------
+/* If Package is the empty string the control record will be parsed to
+   determine what the package name is. */
+bool ContentsWriter::DoPackage(string FileName, string Package)
+{
+   if (!Db.GetFileInfo(FileName,
+	    Package.empty(), /* DoControl */
+	    true, /* DoContents */
+	    false, /* GenContentsOnly */
+	    false, /* DoSource */
+	    0, /* DoHashes */
+	    false /* checkMtime */))
+   {
+      return false;
+   }
+
+   // Parse the package name
+   if (Package.empty() == true)
+   {
+      Package = Db.Control.Section.Find(pkgTagSection::Key::Package).to_string();
+   }
+
+   Db.Contents.Add(Gen,Package);
+   
+   return Db.Finish();
+}
+									/*}}}*/
+// ContentsWriter::ReadFromPkgs - Read from a packages file		/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool ContentsWriter::ReadFromPkgs(string const &PkgFile,string const &PkgCompress)
+{
+   MultiCompress Pkgs(PkgFile,PkgCompress,0,false);
+   if (_error->PendingError() == true)
+      return false;
+
+   // Open the package file
+   FileFd Fd;
+   if (Pkgs.OpenOld(Fd) == false)
+      return false;
+
+   pkgTagFile Tags(&Fd);
+   if (_error->PendingError() == true)
+      return false;
+
+   // Parse.
+   pkgTagSection Section;
+   while (Tags.Step(Section) == true)
+   {
+      auto File = flCombine(Prefix, Section.Find(pkgTagSection::Key::Filename).to_string());
+      auto Package = flCombine(Section.Find(pkgTagSection::Key::Section).to_string(), Section.Find(pkgTagSection::Key::Package).to_string());
+      DoPackage(std::move(File), std::move(Package));
+      if (_error->empty() == false)
+      {
+	 _error->Error("Errors apply to file '%s'",File.c_str());
+	 _error->DumpErrors();
+      }
+   }
+
+   // Tidy the compressor
+   Fd.Close();
+
+   return true;
+}
+
+									/*}}}*/
+
+// ReleaseWriter::ReleaseWriter - Constructor				/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+static std::string formatUTCDateTime(time_t const now)
+{
+   bool const NumericTimezone = _config->FindB("APT::FTPArchive::Release::NumericTimezone", true);
+   // TimeRFC1123 uses GMT to satisfy HTTP/1.1
+   std::string datetime = TimeRFC1123(now, NumericTimezone);
+   if (NumericTimezone == false)
+   {
+      auto const lastspace = datetime.rfind(' ');
+      if (likely(lastspace != std::string::npos))
+	 datetime.replace(lastspace + 1, 3, "UTC");
+   }
+   return datetime;
+}
+ReleaseWriter::ReleaseWriter(FileFd * const GivenOutput, string const &/*DB*/) : FTWScanner(GivenOutput)
+{
+   if (_config->FindB("APT::FTPArchive::Release::Default-Patterns", true) == true)
+   {
+      AddPattern("Packages");
+      AddPattern("Packages.*");
+      AddPattern("Translation-*");
+      AddPattern("Sources");
+      AddPattern("Sources.*");
+      AddPattern("Release");
+      AddPattern("Contents-*");
+      AddPattern("Index");
+      AddPattern("Index.*");
+      AddPattern("icons-*.tar");
+      AddPattern("icons-*.tar.*");
+      AddPattern("Components-*.yml");
+      AddPattern("Components-*.yml.*");
+      AddPattern("md5sum.txt");
+   }
+   AddPatterns(_config->FindVector("APT::FTPArchive::Release::Patterns"));
+
+   time_t const now = time(NULL);
+   time_t const validuntil = now + _config->FindI("APT::FTPArchive::Release::ValidTime", 0);
+
+   map<string,bool> BoolFields;
+   map<string,string> Fields;
+   Fields["Origin"] = "";
+   Fields["Label"] = "";
+   Fields["Suite"] = "";
+   Fields["Version"] = "";
+   Fields["Codename"] = "";
+   Fields["Date"] = formatUTCDateTime(now);
+   if (validuntil != now)
+      Fields["Valid-Until"] = formatUTCDateTime(validuntil);
+   Fields["Architectures"] = "";
+   Fields["Components"] = "";
+   Fields["Description"] = "";
+   Fields["Signed-By"] = "";
+   BoolFields["Acquire-By-Hash"] = _config->FindB("APT::FTPArchive::DoByHash", false);
+   BoolFields["NotAutomatic"] = false;
+   BoolFields["ButAutomaticUpgrades"] = false;
+
+   // Read configuration for string fields, but don't output them
+   for (auto &&I : Fields)
+   {
+      string Config = string("APT::FTPArchive::Release::") + I.first;
+      I.second = _config->Find(Config, I.second);
+   }
+
+   // Read configuration for bool fields, and add them to Fields if true
+   for (auto &&I : BoolFields)
+   {
+      string Config = string("APT::FTPArchive::Release::") + I.first;
+      I.second = _config->FindB(Config, I.second);
+      if (I.second)
+         Fields[I.first] = "yes";
+   }
+
+   // All configuration read and stored in Fields; output
+   for (auto &&I : Fields)
+   {
+      if (I.second.empty())
+         continue;
+      std::string const out = I.first + ": " + I.second + "\n";
+      Output->Write(out.c_str(), out.length());
+   }
+
+   ConfigToDoHashes(DoHashes, "APT::FTPArchive::Release");
+}
+									/*}}}*/
+// ReleaseWriter::DoPackage - Process a single package			/*{{{*/
+// ---------------------------------------------------------------------
+bool ReleaseWriter::DoPackage(string FileName)
+{
+   // Strip the DirStrip prefix from the FileName and add the PathPrefix
+   string NewFileName;
+   if (DirStrip.empty() == false &&
+       FileName.length() > DirStrip.length() &&
+       stringcmp(FileName.begin(),FileName.begin() + DirStrip.length(),
+		 DirStrip.begin(),DirStrip.end()) == 0)
+   {
+      NewFileName = string(FileName.begin() + DirStrip.length(),FileName.end());
+      while (NewFileName[0] == '/')
+         NewFileName = string(NewFileName.begin() + 1,NewFileName.end());
+   }
+   else 
+      NewFileName = FileName;
+
+   if (PathPrefix.empty() == false)
+      NewFileName = flCombine(PathPrefix,NewFileName);
+
+   FileFd fd(FileName, FileFd::ReadOnly);
+
+   if (!fd.IsOpen())
+   {
+      return false;
+   }
+
+   CheckSums[NewFileName].size = fd.Size();
+
+   Hashes hs(DoHashes);
+   hs.AddFD(fd);
+   CheckSums[NewFileName].Hashes = hs.GetHashStringList();
+   fd.Close();
+
+   // FIXME: wrong layer in the code(?)
+   // FIXME2: symlink instead of create a copy
+   if (_config->FindB("APT::FTPArchive::DoByHash", false) == true)
+   {
+      std::string Input = FileName;
+      HashStringList hsl = hs.GetHashStringList();
+      for(HashStringList::const_iterator h = hsl.begin();
+          h != hsl.end(); ++h)
+      {
+         if (!h->usable())
+            continue;
+         if (flNotDir(FileName) == "Release" || flNotDir(FileName) == "InRelease")
+            continue;
+
+         std::string ByHashOutputFile = GenByHashFilename(Input, *h);
+         std::string ByHashOutputDir = flNotFile(ByHashOutputFile);
+         if(!CreateDirectory(flNotFile(Input), ByHashOutputDir))
+            return _error->Warning("can not create dir %s", flNotFile(ByHashOutputFile).c_str());
+
+         // write new hashes
+         FileFd In(Input, FileFd::ReadOnly);
+         FileFd Out(ByHashOutputFile, FileFd::WriteEmpty);
+         if(!CopyFile(In, Out))
+            return _error->Warning("failed to copy %s %s", Input.c_str(), ByHashOutputFile.c_str());
+      }
+   }
+
+   return true;
+}
+
+									/*}}}*/
+// ReleaseWriter::Finish - Output the checksums				/*{{{*/
+// ---------------------------------------------------------------------
+static void printChecksumTypeRecord(FileFd &Output, char const * const Type, map<string, ReleaseWriter::CheckSum> const &CheckSums)
+{
+   {
+      std::string out;
+      strprintf(out, "%s:\n", Type);
+      Output.Write(out.c_str(), out.length());
+   }
+   for(map<string,ReleaseWriter::CheckSum>::const_iterator I = CheckSums.begin();
+	 I != CheckSums.end(); ++I)
+   {
+      HashString const * const hs = I->second.Hashes.find(Type);
+      if (hs == NULL)
+	 continue;
+      std::string out;
+      strprintf(out, " %s %16llu %s\n",
+	    hs->HashValue().c_str(),
+	    (*I).second.size,
+	    (*I).first.c_str());
+      Output.Write(out.c_str(), out.length());
+   }
+}
+void ReleaseWriter::Finish()
+{
+   if ((DoHashes & Hashes::MD5SUM) == Hashes::MD5SUM)
+      printChecksumTypeRecord(*Output, "MD5Sum", CheckSums);
+   if ((DoHashes & Hashes::SHA1SUM) == Hashes::SHA1SUM)
+      printChecksumTypeRecord(*Output, "SHA1", CheckSums);
+   if ((DoHashes & Hashes::SHA256SUM) == Hashes::SHA256SUM)
+      printChecksumTypeRecord(*Output, "SHA256", CheckSums);
+   if ((DoHashes & Hashes::SHA512SUM) == Hashes::SHA512SUM)
+      printChecksumTypeRecord(*Output, "SHA512", CheckSums);
+
+   // go by-hash cleanup
+   map<string,ReleaseWriter::CheckSum>::const_iterator prev = CheckSums.begin();
+   if (_config->FindB("APT::FTPArchive::DoByHash", false) == true)
+   {
+      for(map<string,ReleaseWriter::CheckSum>::const_iterator I = CheckSums.begin();
+	 I != CheckSums.end(); ++I)
+      {
+         if (I->first == "Release" || I->first == "InRelease")
+            continue;
+
+         // keep iterating until we find a new subdir
+         if(flNotFile(I->first) == flNotFile(prev->first))
+            continue;
+
+         // clean that subdir up
+         int keepFiles = _config->FindI("APT::FTPArchive::By-Hash-Keep", 3);
+         // calculate how many compressors are used (the amount of files
+         // in that subdir generated for this run)
+         keepFiles *= std::distance(prev, I);
+         prev = I;
+
+         HashStringList hsl = prev->second.Hashes;
+         for(HashStringList::const_iterator h = hsl.begin();
+             h != hsl.end(); ++h)
+         {
+
+            if (!h->usable())
+               continue;
+
+            std::string RealFilename = DirStrip+"/"+prev->first;
+            std::string ByHashOutputFile = GenByHashFilename(RealFilename, *h);
+            DeleteAllButMostRecent(flNotFile(ByHashOutputFile), keepFiles);
+         }
+      }
+   }
+}