do not segfault in cache generation on mmap failure

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

diff --git a/apt-pkg/policy.cc b/apt-pkg/policy.cc
index 91ad1d5bf7d5d1e9237e6dd96599b01e45663ac9..d442e5c9069dce37789d80b6bbfd3dd375c8cf41 100644 (file)
--- a/apt-pkg/policy.cc
+++ b/apt-pkg/policy.cc
@@ -222,8 +222,8 @@ pkgCache::VerIterator pkgPolicy::GetCandidateVer(pkgCache::PkgIterator const &Pk
 
    return Pref;
 }
-
-// Policy::GetCandidateVer - Get the candidate install version         /*{{{*/
+                                                                       /*}}}*/
+// Policy::GetCandidateVerNew - Get the candidate install version      /*{{{*/
 // ---------------------------------------------------------------------
 /* Evaluate the package pins and the default list to deteremine what the
    best package is. */
@@ -235,16 +235,16 @@ pkgCache::VerIterator pkgPolicy::GetCandidateVerNew(pkgCache::PkgIterator const
    int candPriority = -1;
    pkgVersioningSystem *vs = Cache->VS;
 
-   for (pkgCache::VerIterator ver = Pkg.VersionList(); ver.end() == false; ver++) {
-      int priority = GetPriority(ver);
+   for (pkgCache::VerIterator ver = Pkg.VersionList(); ver.end() == false; ++ver) {
+      int priority = GetPriority(ver, true);
 
-        if (priority == 0 || priority <= candPriority)
-           continue;
+      if (priority == 0 || priority <= candPriority)
+        continue;
 
-        // TODO: Maybe optimize to not compare versions
-        if (!cur.end() && priority < 1000
-           && (vs->CmpVersion(ver.VerStr(), cur.VerStr()) < 0))
-           continue;
+      // TODO: Maybe optimize to not compare versions
+      if (!cur.end() && priority < 1000
+         && (vs->CmpVersion(ver.VerStr(), cur.VerStr()) < 0))
+        continue;
 
       candPriority = priority;
       cand = ver;
@@ -322,7 +322,7 @@ void pkgPolicy::CreatePin(pkgVersionMatch::MatchType Type,string Name,
 
         // Find matching version(s) and copy the pin into it
         pkgVersionMatch Match(P->Data,P->Type);
-        for (pkgCache::VerIterator Ver = Pkg.VersionList(); Ver.end() != true; Ver++)
+        for (pkgCache::VerIterator Ver = Pkg.VersionList(); Ver.end() != true; ++Ver)
         {
            if (Match.VersionMatches(Ver)) {
               Pin *VP = VerPins + Ver->ID;
@@ -409,7 +409,8 @@ bool ReadPinDir(pkgPolicy &Plcy,string Dir)
 
    if (DirectoryExists(Dir) == false)
    {
-      _error->WarningE("DirectoryExists",_("Unable to read %s"),Dir.c_str());
+      if (Dir != "/dev/null")
+        _error->WarningE("DirectoryExists",_("Unable to read %s"),Dir.c_str());
       return true;
    }
 
@@ -438,7 +439,7 @@ bool ReadPinFile(pkgPolicy &Plcy,string File)
    
    FileFd Fd(File,FileFd::ReadOnly);
    pkgTagFile TF(&Fd);
-   if (_error->PendingError() == true)
+   if (Fd.IsOpen() == false || Fd.Failed())
       return false;
 
    pkgUserTagSection Tags;
@@ -477,10 +478,13 @@ bool ReadPinFile(pkgPolicy &Plcy,string File)
       }
       for (; Word != End && isspace(*Word) != 0; Word++);
 
-      int priority = Tags.FindI("Pin-Priority", 0);
+      _error->PushToStack();
+      int const priority = Tags.FindI("Pin-Priority", 0);
+      bool const newError = _error->PendingError();
+      _error->MergeWithStack();
       if (priority < std::numeric_limits<short>::min() ||
           priority > std::numeric_limits<short>::max() ||
-         _error->PendingError()) {
+         newError) {
         return _error->Error(_("%s: Value %s is outside the range of valid pin priorities (%d to %d)"),
                              File.c_str(), Tags.FindS("Pin-Priority").c_str(),
                              std::numeric_limits<short>::min(),