Support Git repos in the Nix path

E.g.

  $ nix-build -I nixpkgs=git://github.com/NixOS/nixpkgs '<nixpkgs>' -A hello

This is not extremely useful yet because you can't specify a
branch/revision.

1 files changed, 14 insertions, 0 deletions

diff --git a/src/libexpr/primops/fetchgit.hh b/src/libexpr/primops/fetchgit.hh
new file mode 100644
index 000000000..6ffb21a96
--- /dev/null
+++ b/src/libexpr/primops/fetchgit.hh
@@ -0,0 +1,14 @@
+#pragma once
+
+#include <string>
+
+#include "ref.hh"
+
+namespace nix {
+
+class Store;
+
+Path exportGit(ref<Store> store,
+    const std::string & uri, const std::string & rev);
+
+}