[ntk/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/error.h>
#include <apt-pkg/sptr.h>
    
#include <apti18n.h>

#include <dirent.h>
#include <sys/stat.h>
#include <algorithm>
#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++)
	 cout << "Prio of " << F.FileName() << ' ' << PFPriority[F->ID] << 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);

   // 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 (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;
      }            
   }
   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)
{
   Pin *P = 0;
   
   if (Name.empty() == true)
      P = &*Defaults.insert(Defaults.end(),PkgPin());
   else
   {
      // Get a spot to put the pin
      pkgCache::PkgIterator Pkg = Cache->FindPkg(Name);
      if (Pkg.end() == true)
      {
	 // 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());      
      }
      else
      {
	 P = Pins + Pkg->ID;
      }      
   }
   
   // Set..
   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		/*{{{*/
// ---------------------------------------------------------------------
/* */
bool ReadPinDir(pkgPolicy &Plcy,string Dir)
{
   if (Dir.empty() == true)
      Dir = _config->FindDir("Dir::Etc::PreferencesParts");

   DIR *D = opendir(Dir.c_str());
   if (D == 0)
      return _error->Errno("opendir",_("Unable to read %s"),Dir.c_str());

   vector<string> List;

   for (struct dirent *Ent = readdir(D); Ent != 0; Ent = readdir(D))
   {
      if (Ent->d_name[0] == '.')
	 continue;

      // Skip bad file names ala run-parts
      const char *C = Ent->d_name;
      for (; *C != 0; C++)
	 if (isalpha(*C) == 0 && isdigit(*C) == 0 && *C != '_' && *C != '-')
	    break;
      if (*C != 0)
	 continue;

      // Make sure it is a file and not something else
      string File = flCombine(Dir,Ent->d_name);
      struct stat St;
      if (stat(File.c_str(),&St) != 0 || S_ISREG(St.st_mode) == 0)
	 continue;

      List.push_back(File);
   }
   closedir(D);

   sort(List.begin(),List.end());

   // 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>
	30	#include <apt-pkg/error.h>
	31	#include <apt-pkg/sptr.h>
	32
	33	#include <apti18n.h>
e7b470ee	34
e68ca100 JAK	35	#include <dirent.h>
	36	#include <sys/stat.h>
	37	#include <algorithm>
e7b470ee	38	#include <iostream>
1c62ab24	39	#include <sstream>
b2e465d6 AL	40	/}}}/
b2e465d6 AL	41
e7b470ee AL	42	using namespace std;
e7b470ee AL	43
b2e465d6 AL	44	// Policy::Init - Startup and bind to a cache /{{{/
	45	// ---------------------------------------------------------------------
	46	/* Set the defaults for operation. The default mode with no loaded policy
	47	file matches the V0 policy engine. */
	48	pkgPolicy::pkgPolicy(pkgCache *Owner) : Pins(0), PFPriority(0), Cache(Owner)
	49	{
	50	PFPriority = new signed short[Owner->Head().PackageFileCount];
	51	Pins = new Pin[Owner->Head().PackageCount];
	52
	53	for (unsigned long I = 0; I != Owner->Head().PackageCount; I++)
	54	Pins[I].Type = pkgVersionMatch::None;
	55
	56	// The config file has a master override.
	57	string DefRel = _config->Find("APT::Default-Release");
	58	if (DefRel.empty() == false)
	59	CreatePin(pkgVersionMatch::Release,"",DefRel,990);
	60
	61	InitDefaults();
	62	}
	63	/}}}/
	64	// Policy::InitDefaults - Compute the default selections /{{{/
	65	// ---------------------------------------------------------------------
	66	/* */
	67	bool pkgPolicy::InitDefaults()
	68	{
	69	// Initialize the priorities based on the status of the package file
	70	for (pkgCache::PkgFileIterator I = Cache->FileBegin(); I != Cache->FileEnd(); I++)
	71	{
	72	PFPriority[I->ID] = 500;
	73	if ((I->Flags & pkgCache::Flag::NotSource) == pkgCache::Flag::NotSource)
	74	PFPriority[I->ID] = 100;
	75	else
	76	if ((I->Flags & pkgCache::Flag::NotAutomatic) == pkgCache::Flag::NotAutomatic)
	77	PFPriority[I->ID] = 1;
	78	}
	79
	80	// Apply the defaults..
20ebd488	81	SPtrArray<bool> Fixed = new bool[Cache->HeaderP->PackageFileCount];
b2e465d6 AL	82	memset(Fixed,0,sizeof(Fixed)Cache->HeaderP->PackageFileCount);
	83	signed Cur = 989;
	84	StatusOverride = false;
	85	for (vector<Pin>::const_iterator I = Defaults.begin(); I != Defaults.end();
	86	I++, Cur--)
	87	{
	88	pkgVersionMatch Match(I->Data,I->Type);
	89	for (pkgCache::PkgFileIterator F = Cache->FileBegin(); F != Cache->FileEnd(); F++)
	90	{
b2e465d6 AL	91	if (Match.FileMatch(F) == true && Fixed[F->ID] == false)
	92	{
	93	if (I->Priority != 0 && I->Priority > 0)
	94	Cur = I->Priority;
	95
	96	if (I->Priority < 0)
	97	PFPriority[F->ID] = I->Priority;
	98	else
	99	PFPriority[F->ID] = Cur;
	100
	101	if (PFPriority[F->ID] > 1000)
	102	StatusOverride = true;
	103
	104	Fixed[F->ID] = true;
	105	}
	106	}
	107	}
	108
	109	if (_config->FindB("Debug::pkgPolicy",false) == true)
	110	for (pkgCache::PkgFileIterator F = Cache->FileBegin(); F != Cache->FileEnd(); F++)
	111	cout << "Prio of " << F.FileName() << ' ' << PFPriority[F->ID] << endl;
	112
	113	return true;
	114	}
	115	/}}}/
	116	// Policy::GetCandidateVer - Get the candidate install version /{{{/
	117	// ---------------------------------------------------------------------
	118	/* Evaluate the package pins and the default list to deteremine what the
	119	best package is. */
	120	pkgCache::VerIterator pkgPolicy::GetCandidateVer(pkgCache::PkgIterator Pkg)
	121	{
b2e465d6	122	// Look for a package pin and evaluate it.
af87ab54 AL	123	signed Max = GetPriority(Pkg);
af87ab54 AL	124	pkgCache::VerIterator Pref = GetMatch(Pkg);
e7b470ee	125
9f5bf66a DK	126	// no package = no candidate version
	127	if (Pkg.end() == true)
	128	return Pref;
	129
	130	// packages with a pin lower than 0 have no newer candidate than the current version
	131	if (Max < 0)
	132	return Pkg.CurrentVer();
	133
b2e465d6 AL	134	/* Falling through to the default version.. Setting Max to zero
	135	effectively excludes everything <= 0 which are the non-automatic
	136	priorities.. The status file is given a prio of 100 which will exclude
	137	not-automatic sources, except in a single shot not-installed mode.
	138	The second pseduo-status file is at prio 1000, above which will permit
	139	the user to force-downgrade things.
	140
	141	The user pin is subject to the same priority rules as default
	142	selections. Thus there are two ways to create a pin - a pin that
	143	tracks the default when the default is taken away, and a permanent
	144	pin that stays at that setting.
	145	*/
	146	for (pkgCache::VerIterator Ver = Pkg.VersionList(); Ver.end() == false; Ver++)
10639577	147	{
b2e465d6 AL	148	for (pkgCache::VerFileIterator VF = Ver.FileList(); VF.end() == false; VF++)
b2e465d6 AL	149	{
6aeda9fa AL	150	/* If this is the status file, and the current version is not the
	151	version in the status file (ie it is not installed, or somesuch)
	152	then it is not a candidate for installation, ever. This weeds
	153	out bogus entries that may be due to config-file states, or
	154	other. */
	155	if ((VF.File()->Flags & pkgCache::Flag::NotSource) == pkgCache::Flag::NotSource &&
	156	Pkg.CurrentVer() != Ver)
	157	continue;
	158
b2e465d6 AL	159	signed Prio = PFPriority[VF.File()->ID];
	160	if (Prio > Max)
	161	{
	162	Pref = Ver;
	163	Max = Prio;
	164	}
	165	}
	166
	167	if (Pkg.CurrentVer() == Ver && Max < 1000)
	168	{
	169	/* Elevate our current selection (or the status file itself)
	170	to the Pseudo-status priority. */
	171	if (Pref.end() == true)
	172	Pref = Ver;
	173	Max = 1000;
	174
	175	// Fast path optimize.
	176	if (StatusOverride == false)
	177	break;
	178	}
	179	}
b2e465d6 AL	180	return Pref;
	181	}
	182	/}}}/
	183	// Policy::CreatePin - Create an entry in the pin table.. /{{{/
	184	// ---------------------------------------------------------------------
	185	/* For performance we have 3 tables, the default table, the main cache
	186	table (hashed to the cache). A blank package name indicates the pin
	187	belongs to the default table. Order of insertion matters here, the
	188	earlier defaults override later ones. */
	189	void pkgPolicy::CreatePin(pkgVersionMatch::MatchType Type,string Name,
	190	string Data,signed short Priority)
	191	{
b2e465d6 AL	192	Pin *P = 0;
	193
	194	if (Name.empty() == true)
b8b7c37d	195	P = &*Defaults.insert(Defaults.end(),PkgPin());
b2e465d6 AL	196	else
	197	{
	198	// Get a spot to put the pin
d4887f3c	199	pkgCache::PkgIterator Pkg = Cache->FindPkg(Name);
b2e465d6 AL	200	if (Pkg.end() == true)
	201	{
	202	// Check the unmatched table
	203	for (vector<PkgPin>::iterator I = Unmatched.begin();
	204	I != Unmatched.end() && P == 0; I++)
	205	if (I->Pkg == Name)
d4887f3c	206	P = &*I;
b2e465d6 AL	207
b2e465d6 AL	208	if (P == 0)
b8b7c37d	209	P = &*Unmatched.insert(Unmatched.end(),PkgPin());
b2e465d6 AL	210	}
	211	else
	212	{
	213	P = Pins + Pkg->ID;
	214	}
	215	}
	216
	217	// Set..
	218	P->Type = Type;
	219	P->Priority = Priority;
	220	P->Data = Data;
	221	}
	222	/}}}/
af87ab54 AL	223	// Policy::GetMatch - Get the matching version for a package pin /{{{/
	224	// ---------------------------------------------------------------------
	225	/* */
	226	pkgCache::VerIterator pkgPolicy::GetMatch(pkgCache::PkgIterator Pkg)
	227	{
	228	const Pin &PPkg = Pins[Pkg->ID];
	229	if (PPkg.Type != pkgVersionMatch::None)
	230	{
	231	pkgVersionMatch Match(PPkg.Data,PPkg.Type);
e7b470ee	232	return Match.Find(Pkg);
af87ab54 AL	233	}
	234	return pkgCache::VerIterator(*Pkg.Cache());
	235	}
	236	/}}}/
	237	// Policy::GetPriority - Get the priority of the package pin /{{{/
	238	// ---------------------------------------------------------------------
	239	/* */
	240	signed short pkgPolicy::GetPriority(pkgCache::PkgIterator const &Pkg)
	241	{
	242	if (Pins[Pkg->ID].Type != pkgVersionMatch::None)
	243	{
	244	// In this case 0 means default priority
	245	if (Pins[Pkg->ID].Priority == 0)
	246	return 989;
	247	return Pins[Pkg->ID].Priority;
	248	}
	249
	250	return 0;
	251	}
	252	/}}}/
81e9789b MV	253	// PreferenceSection class - Overriding the default TrimRecord method /{{{/
	254	// ---------------------------------------------------------------------
	255	/* The preference file is a user generated file so the parser should
	256	therefore be a bit more friendly by allowing comments and new lines
	257	all over the place rather than forcing a special format */
	258	class PreferenceSection : public pkgTagSection
	259	{
	260	void TrimRecord(bool BeforeRecord, const char* &End)
	261	{
	262	for (; Stop < End && (Stop[0] == '\n' \|\| Stop[0] == '\r' \|\| Stop[0] == '#'); Stop++)
	263	if (Stop[0] == '#')
	264	Stop = (const char*) memchr(Stop,'\n',End-Stop);
	265	}
	266	};
	267	/}}}/
ef1dff93 DK	268	// ReadPinDir - Load the pin files from this dir into a Policy /{{{/
	269	// ---------------------------------------------------------------------
	270	/* */
e68ca100 JAK	271	bool ReadPinDir(pkgPolicy &Plcy,string Dir)
	272	{
	273	if (Dir.empty() == true)
	274	Dir = _config->FindDir("Dir::Etc::PreferencesParts");
	275
	276	DIR *D = opendir(Dir.c_str());
	277	if (D == 0)
	278	return _error->Errno("opendir",_("Unable to read %s"),Dir.c_str());
	279
	280	vector<string> List;
ef1dff93	281
e68ca100 JAK	282	for (struct dirent *Ent = readdir(D); Ent != 0; Ent = readdir(D))
	283	{
	284	if (Ent->d_name[0] == '.')
	285	continue;
ef1dff93	286
e68ca100 JAK	287	// Skip bad file names ala run-parts
	288	const char *C = Ent->d_name;
	289	for (; *C != 0; C++)
	290	if (isalpha(C) == 0 && isdigit(C) == 0 && C != '_' && C != '-')
	291	break;
	292	if (*C != 0)
	293	continue;
ef1dff93	294
e68ca100 JAK	295	// Make sure it is a file and not something else
	296	string File = flCombine(Dir,Ent->d_name);
	297	struct stat St;
	298	if (stat(File.c_str(),&St) != 0 \|\| S_ISREG(St.st_mode) == 0)
	299	continue;
ef1dff93 DK	300
	301	List.push_back(File);
	302	}
e68ca100	303	closedir(D);
ef1dff93	304
e68ca100 JAK	305	sort(List.begin(),List.end());
	306
	307	// Read the files
	308	for (vector<string>::const_iterator I = List.begin(); I != List.end(); I++)
	309	if (ReadPinFile(Plcy, *I) == false)
	310	return false;
	311	return true;
	312	}
81e9789b	313	/}}}/
b2e465d6 AL	314	// ReadPinFile - Load the pin file into a Policy /{{{/
	315	// ---------------------------------------------------------------------
	316	/* I'd like to see the preferences file store more than just pin information
	317	but right now that is the only stuff I have to store. Later there will
	318	have to be some kind of combined super parser to get the data into all
	319	the right classes.. */
	320	bool ReadPinFile(pkgPolicy &Plcy,string File)
	321	{
	322	if (File.empty() == true)
	323	File = _config->FindFile("Dir::Etc::Preferences");
	324
	325	if (FileExists(File) == false)
	326	return true;
	327
	328	FileFd Fd(File,FileFd::ReadOnly);
	329	pkgTagFile TF(&Fd);
	330	if (_error->PendingError() == true)
	331	return false;
	332
81e9789b	333	PreferenceSection Tags;
b2e465d6 AL	334	while (TF.Step(Tags) == true)
	335	{
	336	string Name = Tags.FindS("Package");
	337	if (Name.empty() == true)
e68ca100	338	return _error->Error(_("Invalid record in the preferences file %s, no Package header"), File.c_str());
b2e465d6 AL	339	if (Name == "*")
	340	Name = string();
	341
	342	const char *Start;
	343	const char *End;
	344	if (Tags.Find("Pin",Start,End) == false)
	345	continue;
	346
	347	const char *Word = Start;
	348	for (; Word != End && isspace(*Word) == 0; Word++);
	349
	350	// Parse the type..
	351	pkgVersionMatch::MatchType Type;
	352	if (stringcasecmp(Start,Word,"version") == 0 && Name.empty() == false)
	353	Type = pkgVersionMatch::Version;
	354	else if (stringcasecmp(Start,Word,"release") == 0)
	355	Type = pkgVersionMatch::Release;
	356	else if (stringcasecmp(Start,Word,"origin") == 0)
	357	Type = pkgVersionMatch::Origin;
	358	else
	359	{
	360	_error->Warning(_("Did not understand pin type %s"),string(Start,Word).c_str());
	361	continue;
	362	}
	363	for (; Word != End && isspace(*Word) != 0; Word++);
	364
56298634 AL	365	short int priority = Tags.FindI("Pin-Priority", 0);
	366	if (priority == 0)
	367	{
	368	_error->Warning(_("No priority (or zero) specified for pin"));
	369	continue;
	370	}
	371
1c62ab24 MV	372	istringstream s(Name);
	373	string pkg;
	374	while(!s.eof())
	375	{
	376	s >> pkg;
	377	Plcy.CreatePin(Type, pkg, string(Word,End),priority);
	378	};
b2e465d6 AL	379	}
	380
	381	Plcy.InitDefaults();
	382	return true;
	383	}
	384	/}}}/