Get rid of pkgExtract and pkgFLCache

These classes are not actually being used, they were part of the
dpkg replacement that never happened.

1 files changed, 0 insertions, 514 deletions

diff --git a/apt-inst/extract.cc b/apt-inst/extract.cc
deleted file mode 100644
index 35fa015e7..000000000
--- a/apt-inst/extract.cc
+++ /dev/null
@@ -1,514 +0,0 @@
-// -*- mode: cpp; mode: fold -*-
-// Description								/*{{{*/
-/* ######################################################################
-
-   Archive Extraction Directory Stream
-   
-   Extraction for each file is a bit of an involved process. Each object
-   undergoes an atomic backup, overwrite, erase sequence. First the
-   object is unpacked to '.dpkg.new' then the original is hardlinked to
-   '.dpkg.tmp' and finally the new object is renamed to overwrite the old
-   one. From an external perspective the file never ceased to exist.
-   After the archive has been successfully unpacked the .dpkg.tmp files
-   are erased. A failure causes all the .dpkg.tmp files to be restored.
-   
-   Decisions about unpacking go like this:
-      - Store the original filename in the file listing
-      - Resolve any diversions that would effect this file, all checks
-        below apply to the diverted name, not the real one.
-      - Resolve any symlinked configuration files.
-      - If the existing file does not exist then .dpkg-tmp is checked for.
-        [Note, this is reduced to only check if a file was expected to be
-         there]
-      - If the existing link/file is not a directory then it is replaced
-        regardless
-      - If the existing link/directory is being replaced by a directory then
-        absolutely nothing happens.
-      - If the existing link/directory is being replaced by a link then
-        absolutely nothing happens.
-      - If the existing link/directory is being replaced by a non-directory
-        then this will abort if the package is not the sole owner of the
-        directory. [Note, this is changed to not happen if the directory
-        non-empty - that is, it only includes files that are part of this
-        package - prevents removing user files accidentally.]
-      - If the non-directory exists in the listing database and it
-        does not belong to the current package then an overwrite condition
-        is invoked. 
-   
-   As we unpack we record the file list differences in the FL cache. If
-   we need to unroll the FL cache knows which files have been unpacked
-   and can undo. When we need to erase then it knows which files have not 
-   been unpacked.
-   
-   ##################################################################### */
-									/*}}}*/
-// Include Files							/*{{{*/
-#include <config.h>
-
-#include <apt-pkg/debversion.h>
-#include <apt-pkg/dirstream.h>
-#include <apt-pkg/error.h>
-#include <apt-pkg/extract.h>
-#include <apt-pkg/filelist.h>
-#include <apt-pkg/fileutl.h>
-#include <apt-pkg/mmap.h>
-#include <apt-pkg/pkgcache.h>
-
-#include <iostream>
-#include <string>
-#include <dirent.h>
-#include <errno.h>
-#include <stdio.h>
-#include <string.h>
-#include <sys/stat.h>
-
-#include <apti18n.h>
-									/*}}}*/
-using namespace std;
-
-static const char *TempExt = "dpkg-tmp";
-//static const char *NewExt = "dpkg-new";
-
-// Extract::pkgExtract - Constructor					/*{{{*/
-// ---------------------------------------------------------------------
-/* */
-pkgExtract::pkgExtract(pkgFLCache &FLCache,pkgCache::VerIterator Ver) : 
-                       FLCache(FLCache), Ver(Ver)
-{
-   FLPkg = FLCache.GetPkg(Ver.ParentPkg().Name(),true);
-   if (FLPkg.end() == true)
-      return;
-   Debug = true;
-}
-									/*}}}*/
-// Extract::DoItem - Handle a single item from the stream		/*{{{*/
-// ---------------------------------------------------------------------
-/* This performs the setup for the extraction.. */
-bool pkgExtract::DoItem(Item &Itm, int &/*Fd*/)
-{
-   /* Strip any leading/trailing /s from the filename, then copy it to the
-      temp buffer and re-apply the leading / We use a class variable
-      to store the new filename for use by the three extraction funcs */
-   char *End = FileName+1;
-   const char *I = Itm.Name;
-   for (; *I != 0 && *I == '/'; I++);
-   *FileName = '/';
-   for (; *I != 0 && End < FileName + sizeof(FileName); I++, End++)
-      *End = *I;
-   if (End + 20 >= FileName + sizeof(FileName))
-      return _error->Error(_("The path %s is too long"),Itm.Name);   
-   for (; End > FileName && End[-1] == '/'; End--);
-   *End = 0;
-   Itm.Name = FileName;
-   
-   /* Lookup the file. Nde is the file [group] we are going to write to and
-      RealNde is the actual node we are manipulating. Due to diversions
-      they may be entirely different. */
-   pkgFLCache::NodeIterator Nde = FLCache.GetNode(Itm.Name,End,0,false,false);
-   pkgFLCache::NodeIterator RealNde = Nde;
-      
-   // See if the file is already in the file listing
-   unsigned long FileGroup = RealNde->File;
-   for (; RealNde.end() == false && FileGroup == RealNde->File; RealNde++)
-      if (RealNde.RealPackage() == FLPkg)
-	 break;
-
-   // Nope, create an entry
-   if (RealNde.end() == true)
-   {
-      RealNde = FLCache.GetNode(Itm.Name,End,FLPkg.Offset(),true,false);
-      if (RealNde.end() == true)
-	 return false;
-      RealNde->Flags |= pkgFLCache::Node::NewFile;
-   }
-
-   /* Check if this entry already was unpacked. The only time this should 
-      ever happen is if someone has hacked tar to support capabilities, in
-      which case this needs to be modified anyhow.. */
-   if ((RealNde->Flags & pkgFLCache::Node::Unpacked) ==
-       pkgFLCache::Node::Unpacked)
-      return _error->Error(_("Unpacking %s more than once"),Itm.Name);
-   
-   if (Nde.end() == true)
-      Nde = RealNde;
-
-   /* Consider a diverted file - We are not permitted to divert directories,
-      but everything else is fair game (including conf files!) */
-   if ((Nde->Flags & pkgFLCache::Node::Diversion) != 0)
-   {
-      if (Itm.Type == Item::Directory)
-	 return _error->Error(_("The directory %s is diverted"),Itm.Name);
-
-      /* A package overwriting a diversion target is just the same as 
-         overwriting a normally owned file and is checked for below in
-	 the overwrites mechanism */
-
-      /* If this package is trying to overwrite the target of a diversion, 
-         that is never, ever permitted */
-      pkgFLCache::DiverIterator Div = Nde.Diversion();
-      if (Div.DivertTo() == Nde)
-	 return _error->Error(_("The package is trying to write to the "
-			      "diversion target %s/%s"),Nde.DirN(),Nde.File());
-      
-      // See if it is us and we are following it in the right direction
-      if (Div->OwnerPkg != FLPkg.Offset() && Div.DivertFrom() == Nde)
-      {
-	 Nde = Div.DivertTo();
-	 End = FileName + snprintf(FileName,sizeof(FileName)-20,"%s/%s",
-				   Nde.DirN(),Nde.File());
-	 if (End <= FileName)
-	    return _error->Error(_("The diversion path is too long"));
-      }      
-   }
-   
-   // Deal with symlinks and conf files
-   if ((RealNde->Flags & pkgFLCache::Node::NewConfFile) == 
-       pkgFLCache::Node::NewConfFile)
-   {
-      string Res = flNoLink(Itm.Name);
-      if (Res.length() > sizeof(FileName))
-	 return _error->Error(_("The path %s is too long"),Res.c_str());
-      if (Debug == true)
-	 clog << "Followed conf file from " << FileName << " to " << Res << endl;
-      Itm.Name = strcpy(FileName,Res.c_str());      
-   }
-   
-   /* Get information about the existing file, and attempt to restore
-      a backup if it does not exist */
-   struct stat LExisting;
-   bool EValid = false;
-   if (lstat(Itm.Name,&LExisting) != 0)
-   {
-      // This is bad news.
-      if (errno != ENOENT)
-	 return _error->Errno("stat",_("Failed to stat %s"),Itm.Name);
-      
-      // See if we can recover the backup file
-      if (Nde.end() == false)
-      {
-	 char Temp[sizeof(FileName)];
-	 snprintf(Temp,sizeof(Temp),"%s.%s",Itm.Name,TempExt);
-	 if (rename(Temp,Itm.Name) != 0 && errno != ENOENT)
-	    return _error->Errno("rename",_("Failed to rename %s to %s"),
-				 Temp,Itm.Name);
-	 if (stat(Itm.Name,&LExisting) != 0)
-	 {
-	    if (errno != ENOENT)
-	       return _error->Errno("stat",_("Failed to stat %s"),Itm.Name);
-	 }	 
-	 else
-	    EValid = true;
-      }
-   }
-   else
-      EValid = true;
-   
-   /* If the file is a link we need to stat its destination, get the
-      existing file modes */
-   struct stat Existing = LExisting;
-   if (EValid == true && S_ISLNK(Existing.st_mode))
-   {
-      if (stat(Itm.Name,&Existing) != 0)
-      {
-	 if (errno != ENOENT)
-	    return _error->Errno("stat",_("Failed to stat %s"),Itm.Name);
-	 Existing = LExisting;
-      }      
-   }
-   
-   // We pretend a non-existing file looks like it is a normal file
-   if (EValid == false)
-      Existing.st_mode = S_IFREG;
-   
-   /* Okay, at this point 'Existing' is the stat information for the
-      real non-link file */
-   
-   /* The only way this can be a no-op is if a directory is being
-      replaced by a directory or by a link */
-   if (S_ISDIR(Existing.st_mode) != 0 && 
-       (Itm.Type == Item::Directory || Itm.Type == Item::SymbolicLink))
-      return true;
-      
-   /* Non-Directory being replaced by non-directory. We check for over
-      writes here. */
-   if (Nde.end() == false)
-   {
-      if (HandleOverwrites(Nde) == false)
-	 return false;
-   }
-   
-   /* Directory being replaced by a non-directory - this needs to see if
-      the package is the owner and then see if the directory would be
-      empty after the package is removed [ie no user files will be 
-      erased] */
-   if (S_ISDIR(Existing.st_mode) != 0)
-   {
-      if (CheckDirReplace(Itm.Name) == false)
-	 return _error->Error(_("The directory %s is being replaced by a non-directory"),Itm.Name);
-   }
-   
-   if (Debug == true)
-      clog << "Extract " << string(Itm.Name,End) << endl;
-/*   if (Count != 0)
-      return _error->Error(_("Done"));*/
-   
-   return true;
-}
-									/*}}}*/
-// Extract::Finished - Sequence finished, erase the temp files		/*{{{*/
-// ---------------------------------------------------------------------
-/* */
-APT_PURE bool pkgExtract::Finished()
-{
-   return true;
-}
-									/*}}}*/
-// Extract::Aborted - Sequence aborted, undo all our unpacking		/*{{{*/
-// ---------------------------------------------------------------------
-/* This undoes everything that was done by all calls to the DoItem method
-   and restores the File Listing cache to its original form. It bases its
-   actions on the flags value for each node in the cache. */
-bool pkgExtract::Aborted()
-{
-   if (Debug == true)
-      clog << "Aborted, backing out" << endl;
-   
-   pkgFLCache::NodeIterator Files = FLPkg.Files();
-   map_ptrloc *Last = &FLPkg->Files;
-   
-   /* Loop over all files, restore those that have been unpacked from their
-      dpkg-tmp entries */
-   while (Files.end() == false)
-   {
-      // Locate the hash bucket for the node and locate its group head
-      pkgFLCache::NodeIterator Nde(FLCache,FLCache.HashNode(Files));
-      for (; Nde.end() == false && Files->File != Nde->File; Nde++);
-      if (Nde.end() == true)
-	 return _error->Error(_("Failed to locate node in its hash bucket"));
-      
-      if (snprintf(FileName,sizeof(FileName)-20,"%s/%s",
-		   Nde.DirN(),Nde.File()) <= 0)
-	 return _error->Error(_("The path is too long"));
-      
-      // Deal with diversions
-      if ((Nde->Flags & pkgFLCache::Node::Diversion) != 0)
-      {
-	 pkgFLCache::DiverIterator Div = Nde.Diversion();
-	 
-	 // See if it is us and we are following it in the right direction
-	 if (Div->OwnerPkg != FLPkg.Offset() && Div.DivertFrom() == Nde)
-	 {
-	    Nde = Div.DivertTo();
-	    if (snprintf(FileName,sizeof(FileName)-20,"%s/%s",
-			 Nde.DirN(),Nde.File()) <= 0)
-	       return _error->Error(_("The diversion path is too long"));
-	 }
-      }      
-      
-      // Deal with overwrites+replaces
-      for (; Nde.end() == false && Files->File == Nde->File; Nde++)
-      {
-	 if ((Nde->Flags & pkgFLCache::Node::Replaced) == 
-	     pkgFLCache::Node::Replaced)
-	 {
-	    if (Debug == true)
-	       clog << "De-replaced " << FileName << " from " << Nde.RealPackage()->Name << endl;
-	    Nde->Flags &= ~pkgFLCache::Node::Replaced;
-	 }	 
-      }      
-      
-      // Undo the change in the filesystem
-      if (Debug == true)
-	 clog << "Backing out " << FileName;
-      
-      // Remove a new node
-      if ((Files->Flags & pkgFLCache::Node::NewFile) ==
-	 pkgFLCache::Node::NewFile)
-      {
-	 if (Debug == true)
-	    clog << " [new node]" << endl;
-	 pkgFLCache::Node *Tmp = Files;
-	 Files++;
-	 *Last = Tmp->NextPkg;
-	 Tmp->NextPkg = 0;
-
-	 FLCache.DropNode(Tmp - FLCache.NodeP);
-      }
-      else
-      {
-	 if (Debug == true)
-	    clog << endl;
-	 
-	 Last = &Files->NextPkg;
-	 Files++;
-      }      	 
-   }
-   
-   return true;
-}
-									/*}}}*/
-// Extract::Fail - Extraction of a file Failed				/*{{{*/
-// ---------------------------------------------------------------------
-/* */
-bool pkgExtract::Fail(Item &Itm,int Fd)
-{
-   return pkgDirStream::Fail(Itm,Fd);
-}
-									/*}}}*/
-// Extract::FinishedFile - Finished a file				/*{{{*/
-// ---------------------------------------------------------------------
-/* */
-bool pkgExtract::FinishedFile(Item &Itm,int Fd)
-{
-   return pkgDirStream::FinishedFile(Itm,Fd);
-}
-									/*}}}*/
-// Extract::HandleOverwrites - See if a replaces covers this overwrite	/*{{{*/
-// ---------------------------------------------------------------------
-/* Check if the file is in a package that is being replaced by this 
-   package or if the file is being overwritten. Note that if the file
-   is really a directory but it has been erased from the filesystem 
-   this will fail with an overwrite message. This is a limitation of the
-   dpkg file information format. 
- 
-   XX If a new package installs and another package replaces files in this
-   package what should we do? */
-bool pkgExtract::HandleOverwrites(pkgFLCache::NodeIterator Nde,
-				  bool DiverCheck)
-{
-   pkgFLCache::NodeIterator TmpNde = Nde;
-   unsigned long DiverOwner = 0;
-   unsigned long FileGroup = Nde->File;
-   for (; Nde.end() == false && FileGroup == Nde->File; Nde++)
-   {
-      if ((Nde->Flags & pkgFLCache::Node::Diversion) != 0)
-      {
-	 /* Store the diversion owner if this is the forward direction
-	    of the diversion */
-	 if (DiverCheck == true)
-	    DiverOwner = Nde.Diversion()->OwnerPkg;
-	 continue;
-      }
-
-      pkgFLCache::PkgIterator FPkg(FLCache,Nde.RealPackage());	 
-      if (FPkg.end() == true || FPkg == FLPkg)
-	 continue;
-      
-      /* This tests trips when we are checking a diversion to see
-         if something has already been diverted by this diversion */
-      if (FPkg.Offset() == DiverOwner)
-	 continue;
-
-      // Now see if this package matches one in a replace depends
-      pkgCache::DepIterator Dep = Ver.DependsList();
-      bool Ok = false;
-      for (; Dep.end() == false; ++Dep)
-      {
-	 if (Dep->Type != pkgCache::Dep::Replaces)
-	    continue;
-	 
-	 // Does the replaces apply to this package?
-	 if (strcmp(Dep.TargetPkg().Name(),FPkg.Name()) != 0)
-	     continue;
-	 
-	 /* Check the version for match. I do not think CurrentVer can be
-	    0 if we are here.. */
-	 pkgCache::PkgIterator Pkg = Dep.TargetPkg();
-	 if (Pkg->CurrentVer == 0)
-	 {
-	    _error->Warning(_("Overwrite package match with no version for %s"),Pkg.Name());
-	    continue;
-	 }
-
-	 // Replaces is met
-	 if (debVS.CheckDep(Pkg.CurrentVer().VerStr(),Dep->CompareOp,Dep.TargetVer()) == true)
-	 {
-	    if (Debug == true)
-	       clog << "Replaced file " << Nde.DirN() << '/' << Nde.File() << " from " << Pkg.Name() << endl;
-	    Nde->Flags |= pkgFLCache::Node::Replaced;
-	    Ok = true;
-	    break;
-	 }
-      }
-      
-      // Negative Hit
-      if (Ok == false)
-	 return _error->Error(_("File %s/%s overwrites the one in the package %s"),
-			      Nde.DirN(),Nde.File(),FPkg.Name());
-   }
-   
-   /* If this is a diversion we might have to recurse to process
-      the other side of it */
-   if ((TmpNde->Flags & pkgFLCache::Node::Diversion) != 0)
-   {
-      pkgFLCache::DiverIterator Div = TmpNde.Diversion();
-      if (Div.DivertTo() == TmpNde)
-	 return HandleOverwrites(Div.DivertFrom(),true);
-   }
-   
-   return true;
-}
-									/*}}}*/
-// Extract::CheckDirReplace - See if this directory can be erased	/*{{{*/
-// ---------------------------------------------------------------------
-/* If this directory is owned by a single package and that package is
-   replacing it with something non-directoryish then dpkg allows this.
-   We increase the requirement to be that the directory is non-empty after
-   the package is removed */
-bool pkgExtract::CheckDirReplace(string Dir,unsigned int Depth)
-{
-   // Looping?
-   if (Depth > 40)
-      return false;
-   
-   if (Dir[Dir.size() - 1] != '/')
-      Dir += '/';
-   
-   DIR *D = opendir(Dir.c_str());
-   if (D == 0)
-      return _error->Errno("opendir",_("Unable to read %s"),Dir.c_str());
-
-   string File;
-   for (struct dirent *Dent = readdir(D); Dent != 0; Dent = readdir(D))
-   {
-      // Skip some files
-      if (strcmp(Dent->d_name,".") == 0 ||
-	  strcmp(Dent->d_name,"..") == 0)
-	 continue;
-      
-      // Look up the node
-      File = Dir + Dent->d_name;
-      pkgFLCache::NodeIterator Nde = FLCache.GetNode(File.c_str(),
-						     File.c_str() + File.length(),0,false,false);
-
-      // The file is not owned by this package
-      if (Nde.end() != false || Nde.RealPackage() != FLPkg)
-      {
-	 closedir(D);
-	 return false;
-      }
-      
-      // See if it is a directory
-      struct stat St;
-      if (lstat(File.c_str(),&St) != 0)
-      {
-	 closedir(D);
-	 return _error->Errno("lstat",_("Unable to stat %s"),File.c_str());
-      }
-      
-      // Recurse down directories
-      if (S_ISDIR(St.st_mode) != 0)
-      {
-	 if (CheckDirReplace(File,Depth + 1) == false)
-	 {
-	    closedir(D);
-	    return false;
-	 }
-      }      
-   }
-   
-   // No conflicts
-   closedir(D);
-   return true;
-}
-									/*}}}*/