Add public phased update API

This moves the functions of the PhasedUpgrader class into
various other classes so they can be publicly exposed.

This introduces three new functions:

pkgDepCache::PhasingApplied() tells you whether phasing should
be applied to the package.

pkgProblemResolver::KeepPhasedUpdates() keeps back updates that
have phasing applied.

pkgCache::VerIterator::IsSecurityUpdate() determines whether this
version contains security fixes.

1 files changed, 20 insertions, 0 deletions

diff --git a/apt-pkg/algorithms.cc b/apt-pkg/algorithms.cc
index 3d4096a94..d841d6dd8 100644
--- a/apt-pkg/algorithms.cc
+++ b/apt-pkg/algorithms.cc
@@ -1246,6 +1246,26 @@ bool pkgProblemResolver::InstOrNewPolicyBroken(pkgCache::PkgIterator I)
    return false;
 }
 									/*}}}*/
+// ProblemResolver::KeepPhasedUpdates - Keep back phased updates	/*{{{*/
+// ---------------------------------------------------------------------
+// Hold back upgrades to phased versions of already installed packages, unless
+// they are security updates
+bool pkgProblemResolver::KeepPhasedUpdates()
+{
+   for (pkgCache::PkgIterator I = Cache.PkgBegin(); I.end() == false; ++I)
+   {
+      if (not Cache.PhasingApplied(I))
+	 continue;
+
+      Cache.MarkKeep(I, false, false);
+      Cache.MarkProtected(I);
+      Protect(I);
+   }
+
+   return true;
+}
+
+									/*}}}*/
 // ProblemResolver::ResolveByKeep - Resolve problems using keep		/*{{{*/
 // ---------------------------------------------------------------------
 /* This is the work horse of the soft upgrade routine. It is very gentle