Add ?virtual pattern

This matches any package that does not have versions.

1 files changed, 2 insertions, 0 deletions

diff --git a/apt-pkg/cachefilter-patterns.cc b/apt-pkg/cachefilter-patterns.cc
index f078924ff..986faaf52 100644
--- a/apt-pkg/cachefilter-patterns.cc
+++ b/apt-pkg/cachefilter-patterns.cc
@@ -236,6 +236,8 @@ std::unique_ptr<APT::CacheFilter::Matcher> PatternParser::aPattern(std::unique_p
       return std::make_unique<APT::CacheFilter::TrueMatcher>();
    if (node->matches("?upgradable", 0, 0))
       return std::make_unique<Patterns::PackageIsUpgradable>(file);
+   if (node->matches("?virtual", 0, 0))
+      return std::make_unique<Patterns::PackageIsVirtual>();
    if (node->matches("?x-name-fnmatch", 1, 1))
       return std::make_unique<APT::CacheFilter::PackageNameMatchesFnmatch>(aWord(node->arguments[0]));