Store::computeFSClosure(): Support a set of paths

This way, callers can exploits the parallelism of computeFSClosure()
when they have multiple paths that they need the (combined) closure of.

1 files changed, 10 insertions, 2 deletions

diff --git a/src/libstore/misc.cc b/src/libstore/misc.cc
index 0c2c49e553..9a88cdc317 100644
--- a/src/libstore/misc.cc
+++ b/src/libstore/misc.cc
@@ -8,7 +8,7 @@
 namespace nix {
 
 
-void Store::computeFSClosure(const Path & startPath,
+void Store::computeFSClosure(const PathSet & startPaths,
     PathSet & paths_, bool flipDirection, bool includeOutputs, bool includeDerivers)
 {
     struct State
@@ -85,7 +85,8 @@ void Store::computeFSClosure(const Path & startPath,
             });
     };
 
-    enqueue(startPath);
+    for (auto & startPath : startPaths)
+        enqueue(startPath);
 
     {
         auto state(state_.lock());
@@ -95,6 +96,13 @@ void Store::computeFSClosure(const Path & startPath,
 }
 
 
+void Store::computeFSClosure(const Path & startPath,
+    PathSet & paths_, bool flipDirection, bool includeOutputs, bool includeDerivers)
+{
+    computeFSClosure(PathSet{startPath}, paths_, flipDirection, includeOutputs, includeDerivers);
+}
+
+
 void Store::queryMissing(const PathSet & targets,
     PathSet & willBuild_, PathSet & willSubstitute_, PathSet & unknown_,
     unsigned long long & downloadSize_, unsigned long long & narSize_)