Add a function queryValidPaths()

queryValidPaths() combines multiple calls to isValidPath() in one.
This matters when using the Nix daemon because it reduces latency.
For instance, on "nix-env -qas \*" it reduces execution time from 5.7s
to 4.7s (which is indistinguishable from the non-daemon case).

1 files changed, 2 insertions, 0 deletions

diff --git a/src/libstore/local-store.hh b/src/libstore/local-store.hh
index d24c2da0ee17..7398c1b9e5e0 100644
--- a/src/libstore/local-store.hh
+++ b/src/libstore/local-store.hh
@@ -99,6 +99,8 @@ public:
     
     bool isValidPath(const Path & path);
 
+    PathSet queryValidPaths(const PathSet & paths);
+    
     PathSet queryAllValidPaths();
     
     ValidPathInfo queryPathInfo(const Path & path);