Add with pkgCacheGen::Essential a way to control which packages get the

[apt.git] / apt-pkg / algorithms.h

diff --git a/apt-pkg/algorithms.h b/apt-pkg/algorithms.h
index d6078b2cb48af340f4b6785d7430ce96cc9ad491..cee30b679f3509d00611593eac0c062b5731ab7d 100644 (file)
--- a/apt-pkg/algorithms.h
+++ b/apt-pkg/algorithms.h
@@ -1,6 +1,6 @@
 // -*- mode: cpp; mode: fold -*-
 // Description                                                         /*{{{*/
-// $Id: algorithms.h,v 1.2 1998/07/12 23:58:22 jgg Exp $
+// $Id: algorithms.h,v 1.10 2001/05/22 04:17:41 jgg Exp $
 /* ######################################################################
 
    Algorithms - A set of misc algorithms
@@ -14,40 +14,69 @@
    
    pkgApplyStatus sets the target state based on the content of the status
    field in the status file. It is important to get proper crash recovery.
+
+   pkgFixBroken corrects a broken system so that it is in a sane state.
+ 
+   pkgAllUpgrade attempts to upgade as many packages as possible but 
+   without installing new packages.
    
+   The problem resolver class contains a number of complex algorithms
+   to try to best-guess an upgrade state. It solves the problem of 
+   maximizing the number of install state packages while having no broken
+   packages. 
+
    ##################################################################### */
                                                                        /*}}}*/
-// Header section: pkglib
 #ifndef PKGLIB_ALGORITHMS_H
 #define PKGLIB_ALGORITHMS_H
 
-#ifdef __GNUG__
-#pragma interface "apt-pkg/algorithms.h"
-#endif 
 
 #include <apt-pkg/packagemanager.h>
 #include <apt-pkg/depcache.h>
+#include <apt-pkg/acquire.h>
+
+#include <iostream>
+
+using std::ostream;
 
-class pkgSimulate : public pkgPackageManager
+class pkgSimulate : public pkgPackageManager                           /*{{{*/
 {
    protected:
 
+   class Policy : public pkgDepCache::Policy
+   {
+      pkgDepCache *Cache;
+      public:
+      
+      virtual VerIterator GetCandidateVer(PkgIterator Pkg)
+      {
+        return (*Cache)[Pkg].CandidateVerIter(*Cache);
+      }
+      
+      Policy(pkgDepCache *Cache) : Cache(Cache) {};
+   };
+   
    unsigned char *Flags;
    
+   Policy iPolicy;
    pkgDepCache Sim;
+   pkgDepCache::ActionGroup group;
    
    // The Actuall installation implementation
    virtual bool Install(PkgIterator Pkg,string File);
    virtual bool Configure(PkgIterator Pkg);
-   virtual bool Remove(PkgIterator Pkg);
+   virtual bool Remove(PkgIterator Pkg,bool Purge);
+
+private:
    void ShortBreaks();
+   void Describe(PkgIterator iPkg,ostream &out,bool Current,bool Candidate);
    
    public:
 
-   pkgSimulate(pkgDepCache &Cache);
+   pkgSimulate(pkgDepCache *Cache);
 };
-
-class pkgProblemResolver
+                                                                       /*}}}*/
+class pkgProblemResolver                                               /*{{{*/
 {
    pkgDepCache &Cache;
    typedef pkgCache::PkgIterator PkgIterator;
@@ -58,7 +87,8 @@ class pkgProblemResolver
    typedef pkgCache::Package Package;
    
    enum Flags {Protected = (1 << 0), PreInstalled = (1 << 1),
-               Upgradable = (1 << 2)};
+               Upgradable = (1 << 2), ReInstateTried = (1 << 3),
+               ToRemove = (1 << 4)};
    signed short *Scores;
    unsigned char *Flags;
    bool Debug;
@@ -79,13 +109,30 @@ class pkgProblemResolver
    public:
    
    inline void Protect(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] |= Protected;};
+   inline void Remove(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] |= ToRemove;};
+   inline void Clear(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] &= ~(Protected | ToRemove);};
+   
+   // Try to intelligently resolve problems by installing and removing packages   
    bool Resolve(bool BrokenFix = false);
    
-   pkgProblemResolver(pkgDepCache &Cache);
-};
+   // Try to resolve problems only by using keep
+   bool ResolveByKeep();
 
+   // Install all protected packages   
+   void InstallProtect();   
+   
+   pkgProblemResolver(pkgDepCache *Cache);
+   ~pkgProblemResolver();
+};
+                                                                       /*}}}*/
 bool pkgDistUpgrade(pkgDepCache &Cache);
 bool pkgApplyStatus(pkgDepCache &Cache);
 bool pkgFixBroken(pkgDepCache &Cache);
+bool pkgAllUpgrade(pkgDepCache &Cache);
+bool pkgMinimizeUpgrade(pkgDepCache &Cache);
+
+void pkgPrioSortList(pkgCache &Cache,pkgCache::Version **List);
 
+bool ListUpdate(pkgAcquireStatus &progress, pkgSourceList &List, int PulseInterval=0);
+                    
 #endif