]> git.saurik.com Git - apt.git/blame_incremental - apt-pkg/policy.cc
* remove all the remaining #pragma implementation
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1// -*- mode: cpp; mode: fold -*-
2// Description /*{{{*/
3// $Id: policy.cc,v 1.10 2003/08/12 00:17:37 mdz Exp $
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 /*{{{*/
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>
34
35#include <iostream>
36 /*}}}*/
37
38using namespace std;
39
40// Policy::Init - Startup and bind to a cache /*{{{*/
41// ---------------------------------------------------------------------
42/* Set the defaults for operation. The default mode with no loaded policy
43 file matches the V0 policy engine. */
44pkgPolicy::pkgPolicy(pkgCache *Owner) : Pins(0), PFPriority(0), Cache(Owner)
45{
46 PFPriority = new signed short[Owner->Head().PackageFileCount];
47 Pins = new Pin[Owner->Head().PackageCount];
48
49 for (unsigned long I = 0; I != Owner->Head().PackageCount; I++)
50 Pins[I].Type = pkgVersionMatch::None;
51
52 // The config file has a master override.
53 string DefRel = _config->Find("APT::Default-Release");
54 if (DefRel.empty() == false)
55 CreatePin(pkgVersionMatch::Release,"",DefRel,990);
56
57 InitDefaults();
58}
59 /*}}}*/
60// Policy::InitDefaults - Compute the default selections /*{{{*/
61// ---------------------------------------------------------------------
62/* */
63bool pkgPolicy::InitDefaults()
64{
65 // Initialize the priorities based on the status of the package file
66 for (pkgCache::PkgFileIterator I = Cache->FileBegin(); I != Cache->FileEnd(); I++)
67 {
68 PFPriority[I->ID] = 500;
69 if ((I->Flags & pkgCache::Flag::NotSource) == pkgCache::Flag::NotSource)
70 PFPriority[I->ID] = 100;
71 else
72 if ((I->Flags & pkgCache::Flag::NotAutomatic) == pkgCache::Flag::NotAutomatic)
73 PFPriority[I->ID] = 1;
74 }
75
76 // Apply the defaults..
77 SPtrArray<bool> Fixed = new bool[Cache->HeaderP->PackageFileCount];
78 memset(Fixed,0,sizeof(*Fixed)*Cache->HeaderP->PackageFileCount);
79 signed Cur = 989;
80 StatusOverride = false;
81 for (vector<Pin>::const_iterator I = Defaults.begin(); I != Defaults.end();
82 I++, Cur--)
83 {
84 pkgVersionMatch Match(I->Data,I->Type);
85 for (pkgCache::PkgFileIterator F = Cache->FileBegin(); F != Cache->FileEnd(); F++)
86 {
87 if (Match.FileMatch(F) == true && Fixed[F->ID] == false)
88 {
89 if (I->Priority != 0 && I->Priority > 0)
90 Cur = I->Priority;
91
92 if (I->Priority < 0)
93 PFPriority[F->ID] = I->Priority;
94 else
95 PFPriority[F->ID] = Cur;
96
97 if (PFPriority[F->ID] > 1000)
98 StatusOverride = true;
99
100 Fixed[F->ID] = true;
101 }
102 }
103 }
104
105 if (_config->FindB("Debug::pkgPolicy",false) == true)
106 for (pkgCache::PkgFileIterator F = Cache->FileBegin(); F != Cache->FileEnd(); F++)
107 cout << "Prio of " << F.FileName() << ' ' << PFPriority[F->ID] << endl;
108
109 return true;
110}
111 /*}}}*/
112// Policy::GetCandidateVer - Get the candidate install version /*{{{*/
113// ---------------------------------------------------------------------
114/* Evaluate the package pins and the default list to deteremine what the
115 best package is. */
116pkgCache::VerIterator pkgPolicy::GetCandidateVer(pkgCache::PkgIterator Pkg)
117{
118 // Look for a package pin and evaluate it.
119 signed Max = GetPriority(Pkg);
120 pkgCache::VerIterator Pref = GetMatch(Pkg);
121
122 /* Falling through to the default version.. Setting Max to zero
123 effectively excludes everything <= 0 which are the non-automatic
124 priorities.. The status file is given a prio of 100 which will exclude
125 not-automatic sources, except in a single shot not-installed mode.
126 The second pseduo-status file is at prio 1000, above which will permit
127 the user to force-downgrade things.
128
129 The user pin is subject to the same priority rules as default
130 selections. Thus there are two ways to create a pin - a pin that
131 tracks the default when the default is taken away, and a permanent
132 pin that stays at that setting.
133 */
134 for (pkgCache::VerIterator Ver = Pkg.VersionList(); Ver.end() == false; Ver++)
135 {
136 for (pkgCache::VerFileIterator VF = Ver.FileList(); VF.end() == false; VF++)
137 {
138 /* If this is the status file, and the current version is not the
139 version in the status file (ie it is not installed, or somesuch)
140 then it is not a candidate for installation, ever. This weeds
141 out bogus entries that may be due to config-file states, or
142 other. */
143 if ((VF.File()->Flags & pkgCache::Flag::NotSource) == pkgCache::Flag::NotSource &&
144 Pkg.CurrentVer() != Ver)
145 continue;
146
147 signed Prio = PFPriority[VF.File()->ID];
148 if (Prio > Max)
149 {
150 Pref = Ver;
151 Max = Prio;
152 }
153 }
154
155 if (Pkg.CurrentVer() == Ver && Max < 1000)
156 {
157 /* Elevate our current selection (or the status file itself)
158 to the Pseudo-status priority. */
159 if (Pref.end() == true)
160 Pref = Ver;
161 Max = 1000;
162
163 // Fast path optimize.
164 if (StatusOverride == false)
165 break;
166 }
167 }
168 return Pref;
169}
170 /*}}}*/
171// Policy::CreatePin - Create an entry in the pin table.. /*{{{*/
172// ---------------------------------------------------------------------
173/* For performance we have 3 tables, the default table, the main cache
174 table (hashed to the cache). A blank package name indicates the pin
175 belongs to the default table. Order of insertion matters here, the
176 earlier defaults override later ones. */
177void pkgPolicy::CreatePin(pkgVersionMatch::MatchType Type,string Name,
178 string Data,signed short Priority)
179{
180 Pin *P = 0;
181
182 if (Name.empty() == true)
183 P = &*Defaults.insert(Defaults.end(),PkgPin());
184 else
185 {
186 // Get a spot to put the pin
187 pkgCache::PkgIterator Pkg = Cache->FindPkg(Name);
188 if (Pkg.end() == true)
189 {
190 // Check the unmatched table
191 for (vector<PkgPin>::iterator I = Unmatched.begin();
192 I != Unmatched.end() && P == 0; I++)
193 if (I->Pkg == Name)
194 P = &*I;
195
196 if (P == 0)
197 P = &*Unmatched.insert(Unmatched.end(),PkgPin());
198 }
199 else
200 {
201 P = Pins + Pkg->ID;
202 }
203 }
204
205 // Set..
206 P->Type = Type;
207 P->Priority = Priority;
208 P->Data = Data;
209}
210 /*}}}*/
211// Policy::GetMatch - Get the matching version for a package pin /*{{{*/
212// ---------------------------------------------------------------------
213/* */
214pkgCache::VerIterator pkgPolicy::GetMatch(pkgCache::PkgIterator Pkg)
215{
216 const Pin &PPkg = Pins[Pkg->ID];
217 if (PPkg.Type != pkgVersionMatch::None)
218 {
219 pkgVersionMatch Match(PPkg.Data,PPkg.Type);
220 return Match.Find(Pkg);
221 }
222 return pkgCache::VerIterator(*Pkg.Cache());
223}
224 /*}}}*/
225// Policy::GetPriority - Get the priority of the package pin /*{{{*/
226// ---------------------------------------------------------------------
227/* */
228signed short pkgPolicy::GetPriority(pkgCache::PkgIterator const &Pkg)
229{
230 if (Pins[Pkg->ID].Type != pkgVersionMatch::None)
231 {
232 // In this case 0 means default priority
233 if (Pins[Pkg->ID].Priority == 0)
234 return 989;
235 return Pins[Pkg->ID].Priority;
236 }
237
238 return 0;
239}
240 /*}}}*/
241
242// ReadPinFile - Load the pin file into a Policy /*{{{*/
243// ---------------------------------------------------------------------
244/* I'd like to see the preferences file store more than just pin information
245 but right now that is the only stuff I have to store. Later there will
246 have to be some kind of combined super parser to get the data into all
247 the right classes.. */
248bool ReadPinFile(pkgPolicy &Plcy,string File)
249{
250 if (File.empty() == true)
251 File = _config->FindFile("Dir::Etc::Preferences");
252
253 if (FileExists(File) == false)
254 return true;
255
256 FileFd Fd(File,FileFd::ReadOnly);
257 pkgTagFile TF(&Fd);
258 if (_error->PendingError() == true)
259 return false;
260
261 pkgTagSection Tags;
262 while (TF.Step(Tags) == true)
263 {
264 string Name = Tags.FindS("Package");
265 if (Name.empty() == true)
266 return _error->Error(_("Invalid record in the preferences file, no Package header"));
267 if (Name == "*")
268 Name = string();
269
270 const char *Start;
271 const char *End;
272 if (Tags.Find("Pin",Start,End) == false)
273 continue;
274
275 const char *Word = Start;
276 for (; Word != End && isspace(*Word) == 0; Word++);
277
278 // Parse the type..
279 pkgVersionMatch::MatchType Type;
280 if (stringcasecmp(Start,Word,"version") == 0 && Name.empty() == false)
281 Type = pkgVersionMatch::Version;
282 else if (stringcasecmp(Start,Word,"release") == 0)
283 Type = pkgVersionMatch::Release;
284 else if (stringcasecmp(Start,Word,"origin") == 0)
285 Type = pkgVersionMatch::Origin;
286 else
287 {
288 _error->Warning(_("Did not understand pin type %s"),string(Start,Word).c_str());
289 continue;
290 }
291 for (; Word != End && isspace(*Word) != 0; Word++);
292
293 short int priority = Tags.FindI("Pin-Priority", 0);
294 if (priority == 0)
295 {
296 _error->Warning(_("No priority (or zero) specified for pin"));
297 continue;
298 }
299
300 Plcy.CreatePin(Type,Name,string(Word,End),priority);
301 }
302
303 Plcy.InitDefaults();
304 return true;
305}
306 /*}}}*/