remove unused and strange default-value for pins

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

diff --git a/apt-pkg/policy.cc b/apt-pkg/policy.cc
index d0f97441d878318bcb7a540324c3c8cdde6ce0fd..00693ce544221b718503e3411135f772723c54d4 100644 (file)
--- a/apt-pkg/policy.cc
+++ b/apt-pkg/policy.cc
@@ -4,22 +4,12 @@
 /* ######################################################################
 
    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 and ButAutomaticUpgrades sources
-   0 -> 100    = NotAutomatic sources like experimental
-   -inf -> 0   = Never selected   
-   
+
+   See man apt_preferences for what value means what.
+
    ##################################################################### */
                                                                        /*}}}*/
 // Include Files                                                       /*{{{*/
@@ -33,7 +23,15 @@
 #include <apt-pkg/fileutl.h>
 #include <apt-pkg/error.h>
 #include <apt-pkg/sptr.h>
-
+#include <apt-pkg/cacheiterators.h>
+#include <apt-pkg/pkgcache.h>
+#include <apt-pkg/versionmatch.h>
+
+#include <ctype.h>
+#include <stddef.h>
+#include <string.h>
+#include <string>
+#include <vector>
 #include <iostream>
 #include <sstream>
 
@@ -48,7 +46,7 @@ using namespace std;
    file matches the V0 policy engine. */
 pkgPolicy::pkgPolicy(pkgCache *Owner) : Pins(0), PFPriority(0), Cache(Owner)
 {
-   if (Owner == 0 || &(Owner->Head()) == 0)
+   if (Owner == 0)
       return;
    PFPriority = new signed short[Owner->Head().PackageFileCount];
    Pins = new Pin[Owner->Head().PackageCount];
@@ -99,37 +97,29 @@ bool pkgPolicy::InitDefaults()
    // 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)
+   for (vector<Pin>::const_iterator I = Defaults.begin(); I != Defaults.end(); ++I)
    {
       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 (Fixed[F->ID] == false && Match.FileMatch(F) == true)
         {
-           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)
+           PFPriority[F->ID] = I->Priority;
+
+           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;   
+        std::clog << "Prio of " << F.FileName() << ' ' << PFPriority[F->ID] << std::endl;
+
+   return true;
 }
                                                                        /*}}}*/
 // Policy::GetCandidateVer - Get the candidate install version         /*{{{*/
@@ -158,9 +148,7 @@ pkgCache::VerIterator pkgPolicy::GetCandidateVer(pkgCache::PkgIterator const &Pk
       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
@@ -210,9 +198,9 @@ pkgCache::VerIterator pkgPolicy::GetCandidateVer(pkgCache::PkgIterator const &Pk
            Pref = Ver;
            PrefSeen = true;
         }
-        /* Elevate our current selection (or the status file itself)
-           to the Pseudo-status priority. */
-        Max = 1000;
+        /* Elevate our current selection (or the status file itself) so that only
+           a downgrade can override it from now on */
+        Max = 999;
 
         // Fast path optimize.
         if (StatusOverride == false)
@@ -325,19 +313,13 @@ pkgCache::VerIterator pkgPolicy::GetMatch(pkgCache::PkgIterator const &Pkg)
 // Policy::GetPriority - Get the priority of the package pin           /*{{{*/
 // ---------------------------------------------------------------------
 /* */
-signed short pkgPolicy::GetPriority(pkgCache::PkgIterator const &Pkg)
+APT_PURE 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;
 }
-signed short pkgPolicy::GetPriority(pkgCache::PkgFileIterator const &File)
+APT_PURE signed short pkgPolicy::GetPriority(pkgCache::PkgFileIterator const &File)
 {
    return PFPriority[File->ID];
 }
@@ -349,7 +331,7 @@ signed short pkgPolicy::GetPriority(pkgCache::PkgFileIterator const &File)
    all over the place rather than forcing a special format */
 class PreferenceSection : public pkgTagSection
 {
-   void TrimRecord(bool BeforeRecord, const char* &End)
+   void TrimRecord(bool /*BeforeRecord*/, const char* &End)
    {
       for (; Stop < End && (Stop[0] == '\n' || Stop[0] == '\r' || Stop[0] == '#'); Stop++)
         if (Stop[0] == '#')