Patch MarkInstall to follow currently satisfied Recommends even if they aren't "new...

This handles situations where a recommendation's version requirement has
been tightened.  Instead of breaking the Recommends, the recommendee will
be upgraded.

diff --git a/apt-pkg/depcache.cc b/apt-pkg/depcache.cc
index c218724..ee9f0da 100644 (file)
--- a/apt-pkg/depcache.cc
+++ b/apt-pkg/depcache.cc
@@ -895,24 +895,41 @@ void pkgDepCache::MarkInstall(PkgIterator const &Pkg,bool AutoInst,
       if (IsImportantDep(Start) == false)
         continue;
       
-      /* check if any ImportantDep() (but not Critial) where added
-       * since we installed the package
+      /* Check if any ImportantDep() (but not Critical) were added
+       * since we installed the package.  Also check for deps that
+       * were satisfied in the past: for instance, if a version
+       * restriction in a Recommends was tightened, upgrading the
+       * package should follow that Recommends rather than causing the
+       * dependency to be removed. (bug #470115)
        */
       bool isNewImportantDep = false;
+      bool isPreviouslySatisfiedImportantDep = false;
       if(!ForceImportantDeps && !Start.IsCritical())
       {
         bool found=false;
         VerIterator instVer = Pkg.CurrentVer();
         if(!instVer.end())
         {
-           for (DepIterator D = instVer.DependsList(); D.end() != true; D++)
-           {
+          for (DepIterator D = instVer.DependsList(); D.end() != true; D++)
+            {
               //FIXME: deal better with or-groups(?)
               DepIterator LocalStart = D;
               
               if(IsImportantDep(D) && Start.TargetPkg() == D.TargetPkg())
-                 found=true;
-           }
+                {
+                  if(!isPreviouslySatisfiedImportantDep)
+                    {
+                      DepIterator D2 = D;
+                      while((D2->CompareOp & Dep::Or) != 0)
+                        ++D2;
+
+                      isPreviouslySatisfiedImportantDep =
+                        (((*this)[D2] & DepGNow) != 0);
+                    }
+
+                  found=true;
+                }
+            }
            // this is a new dep if it was not found to be already
            // a important dep of the installed pacakge
            isNewImportantDep = !found;
@@ -922,10 +939,15 @@ void pkgDepCache::MarkInstall(PkgIterator const &Pkg,bool AutoInst,
         if(_config->FindB("Debug::pkgDepCache::AutoInstall",false) == true)
            std::clog << "new important dependency: " 
                      << Start.TargetPkg().Name() << std::endl;
+      if(isPreviouslySatisfiedImportantDep)
+       if(_config->FindB("Debug::pkgDepCache::AutoInstall", false) == true)
+         std::clog << "previously satisfied important dependency on "
+                   << Start.TargetPkg().Name() << std::endl;
 
       // skip important deps if the package is already installed
       if (Pkg->CurrentVer != 0 && Start.IsCritical() == false 
-         && !isNewImportantDep && !ForceImportantDeps)
+         && !isNewImportantDep && !isPreviouslySatisfiedImportantDep
+         && !ForceImportantDeps)
         continue;
       
       /* If we are in an or group locate the first or that can