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Commit	Line	Data
	1	// -- mode: cpp; mode: fold --
	2	// Description /{{{/
	3	// $Id: algorithms.h,v 1.6 1998/10/20 02:39:18 jgg Exp $
	4	/* ######################################################################
	5
	6	Algorithms - A set of misc algorithms
	7
	8	This simulate class displays what the ordering code has done and
	9	analyses it with a fresh new dependency cache. In this way we can
	10	see all of the effects of an upgrade run.
	11
	12	pkgDistUpgrade computes an upgrade that causes as many packages as
	13	possible to move to the newest verison.
	14
	15	pkgApplyStatus sets the target state based on the content of the status
	16	field in the status file. It is important to get proper crash recovery.
	17
	18	pkgFixBroken corrects a broken system so that it is in a sane state.
	19
	20	pkgAllUpgrade attempts to upgade as many packages as possible but
	21	without installing new packages.
	22
	23	The problem resolver class contains a number of complex algorithms
	24	to try to best-guess an upgrade state. It solves the problem of
	25	maximizing the number of install state packages while having no broken
	26	packages.
	27
	28	##################################################################### */
	29	/}}}/
	30	// Header section: pkglib
	31	#ifndef PKGLIB_ALGORITHMS_H
	32	#define PKGLIB_ALGORITHMS_H
	33
	34	#ifdef __GNUG__
	35	#pragma interface "apt-pkg/algorithms.h"
	36	#endif
	37
	38	#include <apt-pkg/packagemanager.h>
	39	#include <apt-pkg/depcache.h>
	40
	41	class pkgSimulate : public pkgPackageManager
	42	{
	43	protected:
	44
	45	unsigned char *Flags;
	46
	47	pkgDepCache Sim;
	48
	49	// The Actuall installation implementation
	50	virtual bool Install(PkgIterator Pkg,string File);
	51	virtual bool Configure(PkgIterator Pkg);
	52	virtual bool Remove(PkgIterator Pkg);
	53	void ShortBreaks();
	54
	55	public:
	56
	57	pkgSimulate(pkgDepCache &Cache);
	58	};
	59
	60	class pkgProblemResolver
	61	{
	62	pkgDepCache &Cache;
	63	typedef pkgCache::PkgIterator PkgIterator;
	64	typedef pkgCache::VerIterator VerIterator;
	65	typedef pkgCache::DepIterator DepIterator;
	66	typedef pkgCache::PrvIterator PrvIterator;
	67	typedef pkgCache::Version Version;
	68	typedef pkgCache::Package Package;
	69
	70	enum Flags {Protected = (1 << 0), PreInstalled = (1 << 1),
	71	Upgradable = (1 << 2), ReInstateTried = (1 << 3),
	72	ToRemove = (1 << 4)};
	73	signed short *Scores;
	74	unsigned char *Flags;
	75	bool Debug;
	76
	77	// Sort stuff
	78	static pkgProblemResolver *This;
	79	static int ScoreSort(const void a,const void b);
	80
	81	struct PackageKill
	82	{
	83	PkgIterator Pkg;
	84	DepIterator Dep;
	85	};
	86
	87	void MakeScores();
	88	bool DoUpgrade(pkgCache::PkgIterator Pkg);
	89
	90	public:
	91
	92	inline void Protect(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] \|= Protected;};
	93	inline void Remove(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] \|= ToRemove;};
	94
	95	// Try to intelligently resolve problems by installing and removing packages
	96	bool Resolve(bool BrokenFix = false);
	97
	98	// Try to resolve problems only by using keep
	99	bool ResolveByKeep();
	100
	101	void InstallProtect();
	102
	103	pkgProblemResolver(pkgDepCache &Cache);
	104	};
	105
	106	bool pkgDistUpgrade(pkgDepCache &Cache);
	107	bool pkgApplyStatus(pkgDepCache &Cache);
	108	bool pkgFixBroken(pkgDepCache &Cache);
	109	bool pkgAllUpgrade(pkgDepCache &Cache);
	110	bool pkgMinimizeUpgrade(pkgDepCache &Cache);
	111
	112	#endif