summaryrefslogtreecommitdiff
path: root/apt-pkg/policy.cc
diff options
context:
space:
mode:
Diffstat (limited to 'apt-pkg/policy.cc')
-rw-r--r--apt-pkg/policy.cc275
1 files changed, 275 insertions, 0 deletions
diff --git a/apt-pkg/policy.cc b/apt-pkg/policy.cc
new file mode 100644
index 000000000..029a37df7
--- /dev/null
+++ b/apt-pkg/policy.cc
@@ -0,0 +1,275 @@
+// -*- mode: cpp; mode: fold -*-
+// Description /*{{{*/
+// $Id: policy.cc,v 1.2 2001/02/20 07:03:17 jgg 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 /*{{{*/
+#ifdef __GNUG__
+#pragma implementation "apt-pkg/policy.h"
+#endif
+#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>
+ /*}}}*/
+
+// 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..
+ SPtr<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++)
+ {
+/* hmm?
+ if ((F->Flags & pkgCache::Flag::NotSource) == pkgCache::Flag::NotSource)
+ continue;*/
+
+ 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)
+{
+ const Pin &PPkg = Pins[Pkg->ID];
+
+ // Look for a package pin and evaluate it.
+ signed Max = 0;
+ pkgCache::VerIterator Pref(*Cache);
+ if (PPkg.Type != pkgVersionMatch::None)
+ {
+ pkgVersionMatch Match(PPkg.Data,PPkg.Type);
+ Pref = Match.Find(Pkg);
+ Max = PPkg.Priority;
+ if (PPkg.Priority == 0)
+ Max = 989;
+ }
+
+ /* 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++)
+ {
+ 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)
+{
+ pkgCache::PkgIterator Pkg = Cache->FindPkg(Name);
+ Pin *P = 0;
+
+ if (Name.empty() == true)
+ P = Defaults.insert(Defaults.end());
+ else
+ {
+ // Get a spot to put the pin
+ 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());
+ }
+ else
+ {
+ P = Pins + Pkg->ID;
+ }
+ }
+
+ // Set..
+ P->Type = Type;
+ P->Priority = Priority;
+ P->Data = Data;
+}
+ /*}}}*/
+
+// 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;
+
+ pkgTagSection Tags;
+ while (TF.Step(Tags) == true)
+ {
+ string Name = Tags.FindS("Package");
+ if (Name.empty() == true)
+ return _error->Error(_("Invalid record in the preferences file, no Package header"));
+ 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++);
+
+ Plcy.CreatePin(Type,Name,string(Word,End),
+ Tags.FindI("Pin-Priority"));
+ }
+
+ Plcy.InitDefaults();
+ return true;
+}
+ /*}}}*/
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-02 06:23:17 +0000