Advanced documentation for 'apt-get install' command, mentioned upgrading possibility.

[apt.git] / apt-pkg / acquire-method.h

// -*- mode: cpp; mode: fold -*-
// Description								/*{{{*/
// $Id: acquire-method.h,v 1.15.2.1 2003/12/24 23:09:17 mdz Exp $
/* ######################################################################

   Acquire Method - Method helper class + functions
   
   These functions are designed to be used within the method task to
   ease communication with APT.
   
   ##################################################################### */
									/*}}}*/

/** \addtogroup acquire
 *  @{
 *
 *  \file acquire-method.h
 */

#ifndef PKGLIB_ACQUIRE_METHOD_H
#define PKGLIB_ACQUIRE_METHOD_H

#include <apt-pkg/configuration.h>
#include <apt-pkg/strutl.h>


class Hashes;
class pkgAcqMethod
{
   protected:

   struct FetchItem
   {
      FetchItem *Next;

      string Uri;
      string DestFile;
      time_t LastModified;
      bool IndexFile;
   };
   
   struct FetchResult
   {
      string MD5Sum;
      string SHA1Sum;
      string SHA256Sum;
      vector<string> GPGVOutput;
      time_t LastModified;
      bool IMSHit;
      string Filename;
      unsigned long Size;
      unsigned long ResumePoint;
      
      void TakeHashes(Hashes &Hash);
      FetchResult();
   };

   // State
   vector<string> Messages;
   FetchItem *Queue;
   FetchItem *QueueBack;
   string FailExtra;
   
   // Handlers for messages
   virtual bool Configuration(string Message);
   virtual bool Fetch(FetchItem * /*Item*/) {return true;};
   
   // Outgoing messages
   void Fail(bool Transient = false);
   inline void Fail(const char *Why, bool Transient = false) {Fail(string(Why),Transient);};
   void Fail(string Why, bool Transient = false);
   void URIStart(FetchResult &Res);
   void URIDone(FetchResult &Res,FetchResult *Alt = 0);
   bool MediaFail(string Required,string Drive);
   virtual void Exit() {};

   public:

   enum CnfFlags {SingleInstance = (1<<0),
                  Pipeline = (1<<1), SendConfig = (1<<2),
                  LocalOnly = (1<<3), NeedsCleanup = (1<<4), 
                  Removable = (1<<5)};

   void Log(const char *Format,...);
   void Status(const char *Format,...);
   
   int Run(bool Single = false);
   inline void SetFailExtraMsg(string Msg) {FailExtra = Msg;};
   
   pkgAcqMethod(const char *Ver,unsigned long Flags = 0);
   virtual ~pkgAcqMethod() {};
};

/** @} */

#endif