Discard candidate if its dependencies can't be satisfied

We do pretty much the same in IsInstallOk, but here we have already set
the state, so we have to unroll the state as well to sort-of replicate
the state we were in before this MarkInstall failed.

1 files changed, 17 insertions, 0 deletions

diff --git a/apt-pkg/depcache.cc b/apt-pkg/depcache.cc
index cd5558461..425918b43 100644
--- a/apt-pkg/depcache.cc
+++ b/apt-pkg/depcache.cc
@@ -1324,7 +1324,24 @@ bool pkgDepCache::MarkInstall(PkgIterator const &Pkg,bool AutoInst,
 	    break;
       } while (Start++ != End);
       if (not foundSolution && End.IsCritical())
+      {
+	 StateCache &State = PkgState[Pkg->ID];
+	 if (not State.Protect())
+	 {
+	    RemoveSizes(Pkg);
+	    RemoveStates(Pkg);
+	    if (Pkg->CurrentVer != 0)
+	       State.InstallVer = State.CandidateVer = Pkg.CurrentVer();
+	    else
+	       State.InstallVer = State.CandidateVer = nullptr;
+	    State.Mode = ModeKeep;
+	    State.Update(Pkg, *this);
+	    AddStates(Pkg);
+	    Update(Pkg);
+	    AddSizes(Pkg);
+	 }
 	 return false;
+      }
    }
    toInstall.clear();