* In the garbage collector, delete invalid paths before deleting

  unreachable paths.  This matters when using --max-freed etc.:
  unreachable paths could become reachable again, so it's nicer to
  keep them if there is "real" garbage to be deleted.  Also, don't use
  readDirectory() but read the Nix store and delete invalid paths in
  parallel.  This reduces GC latency on very large Nix stores.

2 files changed, 10 insertions, 1 deletions

diff --git a/src/libutil/util.cc b/src/libutil/util.cc
index 9adaac40d56e..0352754f592c 100644
--- a/src/libutil/util.cc
+++ b/src/libutil/util.cc
@@ -701,7 +701,7 @@ AutoCloseDir::AutoCloseDir(DIR * dir)
 
 AutoCloseDir::~AutoCloseDir()
 {
-    if (dir) closedir(dir);
+    close();
 }
 
 
@@ -717,6 +717,14 @@ AutoCloseDir::operator DIR *()
 }
 
 
+void AutoCloseDir::close()
+{
+    if (dir) {
+	closedir(dir);
+	dir = 0;
+    }
+}
+
 
 //////////////////////////////////////////////////////////////////////
 
diff --git a/src/libutil/util.hh b/src/libutil/util.hh
index f86290f31694..a1cf68e69d1c 100644
--- a/src/libutil/util.hh
+++ b/src/libutil/util.hh
@@ -223,6 +223,7 @@ public:
     ~AutoCloseDir();
     void operator =(DIR * dir);
     operator DIR *();
+    void close();
 };