From 63c8d3facc1233a46a21c3a64d65da4b637b9587 Mon Sep 17 00:00:00 2001
From: Valentin Reis <valentin.reis@gmail.com>
Date: Fri, 21 Dec 2018 12:38:07 -0600
Subject: [PATCH] Updating the pinning mechanism.

---
 default.nix | 15 +++++++++------
 pin.json    |  7 +++++++
 pin.sh      |  2 ++
 3 files changed, 18 insertions(+), 6 deletions(-)
 create mode 100644 pin.json
 create mode 100755 pin.sh

diff --git a/default.nix b/default.nix
index 0573eae..7245206 100644
--- a/default.nix
+++ b/default.nix
@@ -1,10 +1,13 @@
 {
-  argopkgs-src ? (builtins.fetchGit {
-    url = https://xgitlab.cels.anl.gov/argo/argopkgs.git;
-    ref = "master";
-    rev = "86c53fa5ba67edb3994f6ed971cdfa14bf850b4b";
-  }) ,
-  pkgs ? (import argopkgs-src {}),
+  argopkgs-src ?
+   let
+      hostPkgs = import <nixpkgs> {};
+      pinnedVersion = hostPkgs.lib.importJSON ./pin.json;
+    in
+      hostPkgs.fetchgit {
+        inherit (pinnedVersion) url rev sha256;
+      },
+  pkgs ? import argopkgs-src {},
   nrm-src ? pkgs.nodelevel.nrm.src,
   containers-src ? pkgs.nodelevel.containers.src,
   libnrm-src ? pkgs.nodelevel.libnrm.src
diff --git a/pin.json b/pin.json
new file mode 100644
index 0000000..2565c5b
--- /dev/null
+++ b/pin.json
@@ -0,0 +1,7 @@
+{
+  "url": "https://xgitlab.cels.anl.gov/argo/argopkgs.git",
+  "rev": "61beb966b287b9fbc08b977d2825d54ad161dd85",
+  "date": "2018-12-21T12:26:45-06:00",
+  "sha256": "0l32pd2viwqj78596v5393s9bhldpykgvb6gsg59i9qr1913x6f6",
+  "fetchSubmodules": true
+}
diff --git a/pin.sh b/pin.sh
new file mode 100755
index 0000000..6d58e78
--- /dev/null
+++ b/pin.sh
@@ -0,0 +1,2 @@
+#! /usr/bin/env sh
+nix-prefetch-git https://xgitlab.cels.anl.gov/argo/argopkgs.git refs/heads/master > pin.json
-- 
2.26.2