[apt.git] / apt-pkg / policy.cc

// -*- mode: cpp; mode: fold -*-
// Description								/*{{{*/
// $Id: policy.cc,v 1.10 2003/08/12 00:17:37 mdz Exp $
/* ######################################################################

   Package Version Policy implementation
   
   This is just a really simple wrapper around pkgVersionMatch with
   some added goodies to manage the list of things..
   
   Priority Table:
   
   1000 -> inf = Downgradeable priorities
   1000        = The 'no downgrade' pseduo-status file
   100 -> 1000 = Standard priorities
   990         = Config file override package files
   989         = Start for preference auto-priorities
   500         = Default package files
   100         = The status file
   0 -> 100    = NotAutomatic sources like experimental
   -inf -> 0   = Never selected   
   
   ##################################################################### */
									/*}}}*/
// Include Files							/*{{{*/
#include <apt-pkg/policy.h>
#include <apt-pkg/configuration.h>
#include <apt-pkg/tagfile.h>
#include <apt-pkg/strutl.h>
#include <apt-pkg/fileutl.h>
#include <apt-pkg/error.h>
#include <apt-pkg/sptr.h>

#include <apti18n.h>

#include <iostream>
#include <sstream>
									/*}}}*/

using namespace std;

// Policy::Init - Startup and bind to a cache				/*{{{*/
// ---------------------------------------------------------------------
/* Set the defaults for operation. The default mode with no loaded policy
   file matches the V0 policy engine. */
pkgPolicy::pkgPolicy(pkgCache *Owner) : Pins(0), PFPriority(0), Cache(Owner)
{
   PFPriority = new signed short[Owner->Head().PackageFileCount];
   Pins = new Pin[Owner->Head().PackageCount];

   for (unsigned long I = 0; I != Owner->Head().PackageCount; I++)
      Pins[I].Type = pkgVersionMatch::None;

   // The config file has a master override.
   string DefRel = _config->Find("APT::Default-Release");
   if (DefRel.empty() == false)
      CreatePin(pkgVersionMatch::Release,"",DefRel,990);
      
   InitDefaults();
}
									/*}}}*/
// Policy::InitDefaults - Compute the default selections		/*{{{*/
// ---------------------------------------------------------------------
/* */
bool pkgPolicy::InitDefaults()
{   
   // Initialize the priorities based on the status of the package file
   for (pkgCache::PkgFileIterator I = Cache->FileBegin(); I != Cache->FileEnd(); I++)
   {
      PFPriority[I->ID] = 500;
      if ((I->Flags & pkgCache::Flag::NotSource) == pkgCache::Flag::NotSource)
	 PFPriority[I->ID] = 100;
      else
	 if ((I->Flags & pkgCache::Flag::NotAutomatic) == pkgCache::Flag::NotAutomatic)
	    PFPriority[I->ID] = 1;
   }

   // Apply the defaults..
   SPtrArray<bool> Fixed = new bool[Cache->HeaderP->PackageFileCount];
   memset(Fixed,0,sizeof(*Fixed)*Cache->HeaderP->PackageFileCount);
   signed Cur = 989;
   StatusOverride = false;
   for (vector<Pin>::const_iterator I = Defaults.begin(); I != Defaults.end();
	I++, Cur--)
   {
      pkgVersionMatch Match(I->Data,I->Type);
      for (pkgCache::PkgFileIterator F = Cache->FileBegin(); F != Cache->FileEnd(); F++)
      {
	 if (Match.FileMatch(F) == true && Fixed[F->ID] == false)
	 {
	    if (I->Priority != 0 && I->Priority > 0)
	       Cur = I->Priority;
	    
	    if (I->Priority < 0)
	       PFPriority[F->ID] =  I->Priority;
	    else
	       PFPriority[F->ID] = Cur;
	    
	    if (PFPriority[F->ID] > 1000)
	       StatusOverride = true;
	    
	    Fixed[F->ID] = true;
	 }      
      }      
   }

   if (_config->FindB("Debug::pkgPolicy",false) == true)
      for (pkgCache::PkgFileIterator F = Cache->FileBegin(); F != Cache->FileEnd(); F++)
	 std::clog << "Prio of " << F.FileName() << ' ' << PFPriority[F->ID] << std::endl; 
   
   return true;   
}
									/*}}}*/
// Policy::GetCandidateVer - Get the candidate install version		/*{{{*/
// ---------------------------------------------------------------------
/* Evaluate the package pins and the default list to deteremine what the
   best package is. */
pkgCache::VerIterator pkgPolicy::GetCandidateVer(pkgCache::PkgIterator Pkg)
{
   // Look for a package pin and evaluate it.
   signed Max = GetPriority(Pkg);
   pkgCache::VerIterator Pref = GetMatch(Pkg);

   // Alternatives in case we can not find our package pin (Bug#512318).
   signed MaxAlt = 0;
   pkgCache::VerIterator PrefAlt;

   // no package = no candidate version
   if (Pkg.end() == true)
      return Pref;

   // packages with a pin lower than 0 have no newer candidate than the current version
   if (Max < 0)
      return Pkg.CurrentVer();

   /* Falling through to the default version.. Setting Max to zero
      effectively excludes everything <= 0 which are the non-automatic
      priorities.. The status file is given a prio of 100 which will exclude
      not-automatic sources, except in a single shot not-installed mode.
      The second pseduo-status file is at prio 1000, above which will permit
      the user to force-downgrade things.
      
      The user pin is subject to the same priority rules as default 
      selections. Thus there are two ways to create a pin - a pin that
      tracks the default when the default is taken away, and a permanent
      pin that stays at that setting.
    */
   for (pkgCache::VerIterator Ver = Pkg.VersionList(); Ver.end() == false; Ver++)
   {
      for (pkgCache::VerFileIterator VF = Ver.FileList(); VF.end() == false; VF++)
      {
	 /* If this is the status file, and the current version is not the
	    version in the status file (ie it is not installed, or somesuch)
	    then it is not a candidate for installation, ever. This weeds
	    out bogus entries that may be due to config-file states, or
	    other. */
	 if ((VF.File()->Flags & pkgCache::Flag::NotSource) == pkgCache::Flag::NotSource &&
	     Pkg.CurrentVer() != Ver)
	    continue;
	 	 	 
	 signed Prio = PFPriority[VF.File()->ID];
	 if (Prio > Max)
	 {
	    Pref = Ver;
	    Max = Prio;
	 }
	 if (Prio > MaxAlt)
	 {
	    PrefAlt = Ver;
	    MaxAlt = Prio;
	 }	 
      }      
      
      if (Pkg.CurrentVer() == Ver && Max < 1000)
      {
	 /* Elevate our current selection (or the status file itself)
	    to the Pseudo-status priority. */
	 if (Pref.end() == true)
	    Pref = Ver;
	 Max = 1000;
	 
	 // Fast path optimize.
	 if (StatusOverride == false)
	    break;
      }            
   }
   // If we do not find our candidate, use the one with the highest pin.
   // This means that if there is a version available with pin > 0; there
   // will always be a candidate (Closes: #512318)
   if (!Pref.IsGood() && MaxAlt > 0)
       Pref = PrefAlt;
   return Pref;
}
									/*}}}*/
// Policy::CreatePin - Create an entry in the pin table..		/*{{{*/
// ---------------------------------------------------------------------
/* For performance we have 3 tables, the default table, the main cache
   table (hashed to the cache). A blank package name indicates the pin
   belongs to the default table. Order of insertion matters here, the
   earlier defaults override later ones. */
void pkgPolicy::CreatePin(pkgVersionMatch::MatchType Type,string Name,
			  string Data,signed short Priority)
{
   if (Name.empty() == true)
   {
      Pin *P = &*Defaults.insert(Defaults.end(),PkgPin());
      P->Type = Type;
      P->Priority = Priority;
      P->Data = Data;
      return;
   }

   // Get a spot to put the pin
   pkgCache::GrpIterator Grp = Cache->FindGrp(Name);
   for (pkgCache::PkgIterator Pkg = Grp.FindPkg("any");
	Pkg.end() != true; Pkg = Grp.NextPkg(Pkg))
   {
      Pin *P = 0;
      if (Pkg.end() == false)
	 P = Pins + Pkg->ID;
      else
      {
	 // Check the unmatched table
	 for (vector<PkgPin>::iterator I = Unmatched.begin();
	      I != Unmatched.end() && P == 0; I++)
	    if (I->Pkg == Name)
	       P = &*I;

	 if (P == 0)
	    P = &*Unmatched.insert(Unmatched.end(),PkgPin());
      }
      P->Type = Type;
      P->Priority = Priority;
      P->Data = Data;
   }
}
									/*}}}*/
// Policy::GetMatch - Get the matching version for a package pin	/*{{{*/
// ---------------------------------------------------------------------
/* */
pkgCache::VerIterator pkgPolicy::GetMatch(pkgCache::PkgIterator Pkg)
{
   const Pin &PPkg = Pins[Pkg->ID];
   if (PPkg.Type != pkgVersionMatch::None)
   {
      pkgVersionMatch Match(PPkg.Data,PPkg.Type);
      return Match.Find(Pkg);
   }
   return pkgCache::VerIterator(*Pkg.Cache());
}
									/*}}}*/
// Policy::GetPriority - Get the priority of the package pin		/*{{{*/
// ---------------------------------------------------------------------
/* */
signed short pkgPolicy::GetPriority(pkgCache::PkgIterator const &Pkg)
{
   if (Pins[Pkg->ID].Type != pkgVersionMatch::None)
   {
      // In this case 0 means default priority
      if (Pins[Pkg->ID].Priority == 0)
	 return 989;
      return Pins[Pkg->ID].Priority;
   }
   
   return 0;
}
									/*}}}*/
// PreferenceSection class - Overriding the default TrimRecord method	/*{{{*/
// ---------------------------------------------------------------------
/* The preference file is a user generated file so the parser should
   therefore be a bit more friendly by allowing comments and new lines
   all over the place rather than forcing a special format */
class PreferenceSection : public pkgTagSection
{
   void TrimRecord(bool BeforeRecord, const char* &End)
   {
      for (; Stop < End && (Stop[0] == '\n' || Stop[0] == '\r' || Stop[0] == '#'); Stop++)
	 if (Stop[0] == '#')
	    Stop = (const char*) memchr(Stop,'\n',End-Stop);
   }
};
									/*}}}*/
// ReadPinDir - Load the pin files from this dir into a Policy		/*{{{*/
// ---------------------------------------------------------------------
/* This will load each pin file in the given dir into a Policy. If the
   given dir is empty the dir set in Dir::Etc::PreferencesParts is used.
   Note also that this method will issue a warning if the dir does not
   exists but it will return true in this case! */
bool ReadPinDir(pkgPolicy &Plcy,string Dir)
{
   if (Dir.empty() == true)
      Dir = _config->FindDir("Dir::Etc::PreferencesParts");

   if (FileExists(Dir) == false)
   {
      _error->WarningE("FileExists",_("Unable to read %s"),Dir.c_str());
      return true;
   }

   vector<string> const List = GetListOfFilesInDir(Dir, "pref", true, true);

   // Read the files
   for (vector<string>::const_iterator I = List.begin(); I != List.end(); I++)
      if (ReadPinFile(Plcy, *I) == false)
	 return false;
   return true;
}
									/*}}}*/
// ReadPinFile - Load the pin file into a Policy			/*{{{*/
// ---------------------------------------------------------------------
/* I'd like to see the preferences file store more than just pin information
   but right now that is the only stuff I have to store. Later there will
   have to be some kind of combined super parser to get the data into all
   the right classes.. */
bool ReadPinFile(pkgPolicy &Plcy,string File)
{
   if (File.empty() == true)
      File = _config->FindFile("Dir::Etc::Preferences");

   if (FileExists(File) == false)
      return true;
   
   FileFd Fd(File,FileFd::ReadOnly);
   pkgTagFile TF(&Fd);
   if (_error->PendingError() == true)
      return false;
   
   PreferenceSection Tags;
   while (TF.Step(Tags) == true)
   {
      string Name = Tags.FindS("Package");
      if (Name.empty() == true)
	 return _error->Error(_("Invalid record in the preferences file %s, no Package header"), File.c_str());
      if (Name == "*")
	 Name = string();
      
      const char *Start;
      const char *End;
      if (Tags.Find("Pin",Start,End) == false)
	 continue;
	 
      const char *Word = Start;
      for (; Word != End && isspace(*Word) == 0; Word++);

      // Parse the type..
      pkgVersionMatch::MatchType Type;
      if (stringcasecmp(Start,Word,"version") == 0 && Name.empty() == false)
	 Type = pkgVersionMatch::Version;
      else if (stringcasecmp(Start,Word,"release") == 0)
	 Type = pkgVersionMatch::Release;
      else if (stringcasecmp(Start,Word,"origin") == 0)
	 Type = pkgVersionMatch::Origin;
      else
      {
	 _error->Warning(_("Did not understand pin type %s"),string(Start,Word).c_str());
	 continue;
      }
      for (; Word != End && isspace(*Word) != 0; Word++);

      short int priority = Tags.FindI("Pin-Priority", 0);
      if (priority == 0)
      {
         _error->Warning(_("No priority (or zero) specified for pin"));
         continue;
      }

      istringstream s(Name);
      string pkg;
      while(!s.eof())
      {
	 s >> pkg;
         Plcy.CreatePin(Type, pkg, string(Word,End),priority);
      };
   }

   Plcy.InitDefaults();
   return true;
}
									/*}}}*/
Commit	Line	Data
b2e465d6 AL	1	// -- mode: cpp; mode: fold --
b2e465d6 AL	2	// Description /{{{/
56298634	3	// $Id: policy.cc,v 1.10 2003/08/12 00:17:37 mdz Exp $
b2e465d6 AL	4	/* ######################################################################
	5
	6	Package Version Policy implementation
	7
	8	This is just a really simple wrapper around pkgVersionMatch with
	9	some added goodies to manage the list of things..
	10
	11	Priority Table:
	12
	13	1000 -> inf = Downgradeable priorities
	14	1000 = The 'no downgrade' pseduo-status file
	15	100 -> 1000 = Standard priorities
	16	990 = Config file override package files
	17	989 = Start for preference auto-priorities
	18	500 = Default package files
	19	100 = The status file
	20	0 -> 100 = NotAutomatic sources like experimental
	21	-inf -> 0 = Never selected
	22
	23	##################################################################### */
	24	/}}}/
	25	// Include Files /{{{/
b2e465d6 AL	26	#include <apt-pkg/policy.h>
	27	#include <apt-pkg/configuration.h>
	28	#include <apt-pkg/tagfile.h>
	29	#include <apt-pkg/strutl.h>
46e39c8e	30	#include <apt-pkg/fileutl.h>
b2e465d6 AL	31	#include <apt-pkg/error.h>
b2e465d6 AL	32	#include <apt-pkg/sptr.h>
46e39c8e	33
b2e465d6	34	#include <apti18n.h>
e7b470ee AL	35
e7b470ee AL	36	#include <iostream>
1c62ab24	37	#include <sstream>
b2e465d6 AL	38	/}}}/
b2e465d6 AL	39
e7b470ee AL	40	using namespace std;
e7b470ee AL	41
b2e465d6 AL	42	// Policy::Init - Startup and bind to a cache /{{{/
	43	// ---------------------------------------------------------------------
	44	/* Set the defaults for operation. The default mode with no loaded policy
	45	file matches the V0 policy engine. */
	46	pkgPolicy::pkgPolicy(pkgCache *Owner) : Pins(0), PFPriority(0), Cache(Owner)
	47	{
	48	PFPriority = new signed short[Owner->Head().PackageFileCount];
	49	Pins = new Pin[Owner->Head().PackageCount];
	50
	51	for (unsigned long I = 0; I != Owner->Head().PackageCount; I++)
	52	Pins[I].Type = pkgVersionMatch::None;
	53
	54	// The config file has a master override.
	55	string DefRel = _config->Find("APT::Default-Release");
	56	if (DefRel.empty() == false)
	57	CreatePin(pkgVersionMatch::Release,"",DefRel,990);
	58
	59	InitDefaults();
	60	}
	61	/}}}/
	62	// Policy::InitDefaults - Compute the default selections /{{{/
	63	// ---------------------------------------------------------------------
	64	/* */
	65	bool pkgPolicy::InitDefaults()
	66	{
	67	// Initialize the priorities based on the status of the package file
	68	for (pkgCache::PkgFileIterator I = Cache->FileBegin(); I != Cache->FileEnd(); I++)
	69	{
	70	PFPriority[I->ID] = 500;
	71	if ((I->Flags & pkgCache::Flag::NotSource) == pkgCache::Flag::NotSource)
	72	PFPriority[I->ID] = 100;
	73	else
	74	if ((I->Flags & pkgCache::Flag::NotAutomatic) == pkgCache::Flag::NotAutomatic)
	75	PFPriority[I->ID] = 1;
	76	}
	77
	78	// Apply the defaults..
20ebd488	79	SPtrArray<bool> Fixed = new bool[Cache->HeaderP->PackageFileCount];
b2e465d6 AL	80	memset(Fixed,0,sizeof(Fixed)Cache->HeaderP->PackageFileCount);
	81	signed Cur = 989;
	82	StatusOverride = false;
	83	for (vector<Pin>::const_iterator I = Defaults.begin(); I != Defaults.end();
	84	I++, Cur--)
	85	{
	86	pkgVersionMatch Match(I->Data,I->Type);
	87	for (pkgCache::PkgFileIterator F = Cache->FileBegin(); F != Cache->FileEnd(); F++)
	88	{
b2e465d6 AL	89	if (Match.FileMatch(F) == true && Fixed[F->ID] == false)
	90	{
	91	if (I->Priority != 0 && I->Priority > 0)
	92	Cur = I->Priority;
	93
	94	if (I->Priority < 0)
	95	PFPriority[F->ID] = I->Priority;
	96	else
	97	PFPriority[F->ID] = Cur;
	98
	99	if (PFPriority[F->ID] > 1000)
	100	StatusOverride = true;
	101
	102	Fixed[F->ID] = true;
	103	}
	104	}
	105	}
	106
	107	if (_config->FindB("Debug::pkgPolicy",false) == true)
	108	for (pkgCache::PkgFileIterator F = Cache->FileBegin(); F != Cache->FileEnd(); F++)
4dec007b	109	std::clog << "Prio of " << F.FileName() << ' ' << PFPriority[F->ID] << std::endl;
b2e465d6 AL	110
	111	return true;
	112	}
	113	/}}}/
	114	// Policy::GetCandidateVer - Get the candidate install version /{{{/
	115	// ---------------------------------------------------------------------
	116	/* Evaluate the package pins and the default list to deteremine what the
	117	best package is. */
	118	pkgCache::VerIterator pkgPolicy::GetCandidateVer(pkgCache::PkgIterator Pkg)
	119	{
b2e465d6	120	// Look for a package pin and evaluate it.
af87ab54 AL	121	signed Max = GetPriority(Pkg);
af87ab54 AL	122	pkgCache::VerIterator Pref = GetMatch(Pkg);
e7b470ee	123
8f5525e9 JAK	124	// Alternatives in case we can not find our package pin (Bug#512318).
	125	signed MaxAlt = 0;
	126	pkgCache::VerIterator PrefAlt;
	127
9f5bf66a DK	128	// no package = no candidate version
	129	if (Pkg.end() == true)
	130	return Pref;
	131
	132	// packages with a pin lower than 0 have no newer candidate than the current version
	133	if (Max < 0)
	134	return Pkg.CurrentVer();
	135
b2e465d6 AL	136	/* Falling through to the default version.. Setting Max to zero
	137	effectively excludes everything <= 0 which are the non-automatic
	138	priorities.. The status file is given a prio of 100 which will exclude
	139	not-automatic sources, except in a single shot not-installed mode.
	140	The second pseduo-status file is at prio 1000, above which will permit
	141	the user to force-downgrade things.
	142
	143	The user pin is subject to the same priority rules as default
	144	selections. Thus there are two ways to create a pin - a pin that
	145	tracks the default when the default is taken away, and a permanent
	146	pin that stays at that setting.
	147	*/
	148	for (pkgCache::VerIterator Ver = Pkg.VersionList(); Ver.end() == false; Ver++)
10639577	149	{
b2e465d6 AL	150	for (pkgCache::VerFileIterator VF = Ver.FileList(); VF.end() == false; VF++)
b2e465d6 AL	151	{
6aeda9fa AL	152	/* If this is the status file, and the current version is not the
	153	version in the status file (ie it is not installed, or somesuch)
	154	then it is not a candidate for installation, ever. This weeds
	155	out bogus entries that may be due to config-file states, or
	156	other. */
	157	if ((VF.File()->Flags & pkgCache::Flag::NotSource) == pkgCache::Flag::NotSource &&
	158	Pkg.CurrentVer() != Ver)
	159	continue;
	160
b2e465d6 AL	161	signed Prio = PFPriority[VF.File()->ID];
	162	if (Prio > Max)
	163	{
	164	Pref = Ver;
	165	Max = Prio;
8f5525e9 JAK	166	}
	167	if (Prio > MaxAlt)
	168	{
	169	PrefAlt = Ver;
	170	MaxAlt = Prio;
b2e465d6 AL	171	}
	172	}
	173
	174	if (Pkg.CurrentVer() == Ver && Max < 1000)
	175	{
	176	/* Elevate our current selection (or the status file itself)
	177	to the Pseudo-status priority. */
	178	if (Pref.end() == true)
	179	Pref = Ver;
	180	Max = 1000;
	181
	182	// Fast path optimize.
	183	if (StatusOverride == false)
	184	break;
	185	}
	186	}
8f5525e9 JAK	187	// If we do not find our candidate, use the one with the highest pin.
	188	// This means that if there is a version available with pin > 0; there
	189	// will always be a candidate (Closes: #512318)
	190	if (!Pref.IsGood() && MaxAlt > 0)
	191	Pref = PrefAlt;
b2e465d6 AL	192	return Pref;
	193	}
	194	/}}}/
	195	// Policy::CreatePin - Create an entry in the pin table.. /{{{/
	196	// ---------------------------------------------------------------------
	197	/* For performance we have 3 tables, the default table, the main cache
	198	table (hashed to the cache). A blank package name indicates the pin
	199	belongs to the default table. Order of insertion matters here, the
	200	earlier defaults override later ones. */
	201	void pkgPolicy::CreatePin(pkgVersionMatch::MatchType Type,string Name,
	202	string Data,signed short Priority)
	203	{
b2e465d6	204	if (Name.empty() == true)
b2e465d6	205	{
4a6d2163 DK	206	Pin P = &Defaults.insert(Defaults.end(),PkgPin());
	207	P->Type = Type;
	208	P->Priority = Priority;
	209	P->Data = Data;
	210	return;
	211	}
	212
	213	// Get a spot to put the pin
	214	pkgCache::GrpIterator Grp = Cache->FindGrp(Name);
	215	for (pkgCache::PkgIterator Pkg = Grp.FindPkg("any");
	216	Pkg.end() != true; Pkg = Grp.NextPkg(Pkg))
	217	{
	218	Pin *P = 0;
	219	if (Pkg.end() == false)
	220	P = Pins + Pkg->ID;
	221	else
b2e465d6 AL	222	{
b2e465d6 AL	223	// Check the unmatched table
4a6d2163	224	for (vector<PkgPin>::iterator I = Unmatched.begin();
b2e465d6 AL	225	I != Unmatched.end() && P == 0; I++)
b2e465d6 AL	226	if (I->Pkg == Name)
d4887f3c	227	P = &*I;
4a6d2163	228
b2e465d6	229	if (P == 0)
4a6d2163	230	P = &*Unmatched.insert(Unmatched.end(),PkgPin());
b2e465d6	231	}
4a6d2163 DK	232	P->Type = Type;
	233	P->Priority = Priority;
	234	P->Data = Data;
b2e465d6	235	}
b2e465d6 AL	236	}
b2e465d6 AL	237	/}}}/
af87ab54 AL	238	// Policy::GetMatch - Get the matching version for a package pin /{{{/
	239	// ---------------------------------------------------------------------
	240	/* */
	241	pkgCache::VerIterator pkgPolicy::GetMatch(pkgCache::PkgIterator Pkg)
	242	{
	243	const Pin &PPkg = Pins[Pkg->ID];
	244	if (PPkg.Type != pkgVersionMatch::None)
	245	{
	246	pkgVersionMatch Match(PPkg.Data,PPkg.Type);
e7b470ee	247	return Match.Find(Pkg);
af87ab54 AL	248	}
	249	return pkgCache::VerIterator(*Pkg.Cache());
	250	}
	251	/}}}/
	252	// Policy::GetPriority - Get the priority of the package pin /{{{/
	253	// ---------------------------------------------------------------------
	254	/* */
	255	signed short pkgPolicy::GetPriority(pkgCache::PkgIterator const &Pkg)
	256	{
	257	if (Pins[Pkg->ID].Type != pkgVersionMatch::None)
	258	{
	259	// In this case 0 means default priority
	260	if (Pins[Pkg->ID].Priority == 0)
	261	return 989;
	262	return Pins[Pkg->ID].Priority;
	263	}
	264
	265	return 0;
	266	}
	267	/}}}/
81e9789b MV	268	// PreferenceSection class - Overriding the default TrimRecord method /{{{/
	269	// ---------------------------------------------------------------------
	270	/* The preference file is a user generated file so the parser should
	271	therefore be a bit more friendly by allowing comments and new lines
	272	all over the place rather than forcing a special format */
	273	class PreferenceSection : public pkgTagSection
	274	{
	275	void TrimRecord(bool BeforeRecord, const char* &End)
	276	{
	277	for (; Stop < End && (Stop[0] == '\n' \|\| Stop[0] == '\r' \|\| Stop[0] == '#'); Stop++)
	278	if (Stop[0] == '#')
	279	Stop = (const char*) memchr(Stop,'\n',End-Stop);
	280	}
	281	};
	282	/}}}/
ef1dff93 DK	283	// ReadPinDir - Load the pin files from this dir into a Policy /{{{/
ef1dff93 DK	284	// ---------------------------------------------------------------------
6009e60d DK	285	/* This will load each pin file in the given dir into a Policy. If the
	286	given dir is empty the dir set in Dir::Etc::PreferencesParts is used.
	287	Note also that this method will issue a warning if the dir does not
	288	exists but it will return true in this case! */
e68ca100 JAK	289	bool ReadPinDir(pkgPolicy &Plcy,string Dir)
	290	{
	291	if (Dir.empty() == true)
	292	Dir = _config->FindDir("Dir::Etc::PreferencesParts");
	293
6009e60d DK	294	if (FileExists(Dir) == false)
	295	{
	296	_error->WarningE("FileExists",_("Unable to read %s"),Dir.c_str());
	297	return true;
	298	}
	299
b39c1859	300	vector<string> const List = GetListOfFilesInDir(Dir, "pref", true, true);
e68ca100 JAK	301
	302	// Read the files
	303	for (vector<string>::const_iterator I = List.begin(); I != List.end(); I++)
	304	if (ReadPinFile(Plcy, *I) == false)
	305	return false;
	306	return true;
	307	}
81e9789b	308	/}}}/
b2e465d6 AL	309	// ReadPinFile - Load the pin file into a Policy /{{{/
	310	// ---------------------------------------------------------------------
	311	/* I'd like to see the preferences file store more than just pin information
	312	but right now that is the only stuff I have to store. Later there will
	313	have to be some kind of combined super parser to get the data into all
	314	the right classes.. */
	315	bool ReadPinFile(pkgPolicy &Plcy,string File)
	316	{
	317	if (File.empty() == true)
	318	File = _config->FindFile("Dir::Etc::Preferences");
	319
	320	if (FileExists(File) == false)
	321	return true;
	322
	323	FileFd Fd(File,FileFd::ReadOnly);
	324	pkgTagFile TF(&Fd);
	325	if (_error->PendingError() == true)
	326	return false;
	327
81e9789b	328	PreferenceSection Tags;
b2e465d6 AL	329	while (TF.Step(Tags) == true)
	330	{
	331	string Name = Tags.FindS("Package");
	332	if (Name.empty() == true)
e68ca100	333	return _error->Error(_("Invalid record in the preferences file %s, no Package header"), File.c_str());
b2e465d6 AL	334	if (Name == "*")
	335	Name = string();
	336
	337	const char *Start;
	338	const char *End;
	339	if (Tags.Find("Pin",Start,End) == false)
	340	continue;
	341
	342	const char *Word = Start;
	343	for (; Word != End && isspace(*Word) == 0; Word++);
	344
	345	// Parse the type..
	346	pkgVersionMatch::MatchType Type;
	347	if (stringcasecmp(Start,Word,"version") == 0 && Name.empty() == false)
	348	Type = pkgVersionMatch::Version;
	349	else if (stringcasecmp(Start,Word,"release") == 0)
	350	Type = pkgVersionMatch::Release;
	351	else if (stringcasecmp(Start,Word,"origin") == 0)
	352	Type = pkgVersionMatch::Origin;
	353	else
	354	{
	355	_error->Warning(_("Did not understand pin type %s"),string(Start,Word).c_str());
	356	continue;
	357	}
	358	for (; Word != End && isspace(*Word) != 0; Word++);
	359
56298634 AL	360	short int priority = Tags.FindI("Pin-Priority", 0);
	361	if (priority == 0)
	362	{
	363	_error->Warning(_("No priority (or zero) specified for pin"));
	364	continue;
	365	}
	366
1c62ab24 MV	367	istringstream s(Name);
	368	string pkg;
	369	while(!s.eof())
	370	{
	371	s >> pkg;
	372	Plcy.CreatePin(Type, pkg, string(Word,End),priority);
	373	};
b2e465d6 AL	374	}
	375
	376	Plcy.InitDefaults();
	377	return true;
	378	}
	379	/}}}/