* For efficiency: md5 integrated into nix.

* Command `nix ensure' which is like `nix getpkg' except that if the
  has refers to a run action it will just ensure that the imports are
  there.
* Command `nix closure' to print out the closure of the set of
  descriptors under the import relation, starting at a set of roots.
  This can be used for garbage collection (e.g., given a list of
  `activated' packages, we can delete all packages not reachable from
  those).
* Command `nix graph' to print out a Dot graph of the dependency
  graph.
* `nix-addroot' adds a root for the (unimplemented) garbage collector.

1 files changed, 18 insertions, 0 deletions

diff --git a/src/nix-addroot b/src/nix-addroot
new file mode 100755
index 000000000000..3ab9e8a252f8
--- /dev/null
+++ b/src/nix-addroot
@@ -0,0 +1,18 @@
+#! /bin/sh
+
+ROOTLIST=~/.nixroots
+
+if ! test -f $ROOTLIST; then
+    touch $ROOTLIST
+fi
+
+for i in $*; do
+    if nix ensure $i > /dev/null; then
+	if grep -q $i $ROOTLIST; then
+	    echo $i already is a root
+        else
+            echo adding root $i
+	    echo $i >> $ROOTLIST
+	fi
+    fi
+done