From 4abdb218c7bd88aad8b9178cdaaa6a97079f5ac6 Mon Sep 17 00:00:00 2001
From: lassulus <lass@blue.r>
Date: Wed, 22 Aug 2018 12:55:30 +0200
Subject: [PATCH] automate nixpkgs update

---
 krebs/krops.nix         | 2 +-
 krebs/nixpkgs.json      | 7 +++++++
 krebs/update-channel.sh | 9 +++++++++
 3 files changed, 17 insertions(+), 1 deletion(-)
 create mode 100644 krebs/nixpkgs.json
 create mode 100755 krebs/update-channel.sh

diff --git a/krebs/krops.nix b/krebs/krops.nix
index c2d26812c..c334bc07d 100644
--- a/krebs/krops.nix
+++ b/krebs/krops.nix
@@ -12,7 +12,7 @@
 
   krebs-source = {
     nixpkgs.git = {
-      ref = "e42c07d78a1fefc2d91f11f00e938253b3618a3b";
+      ref = (lib.importJSON ./nixpkgs.json).rev;
       url = https://github.com/NixOS/nixpkgs;
     };
     stockholm.file = toString ../.;
diff --git a/krebs/nixpkgs.json b/krebs/nixpkgs.json
new file mode 100644
index 000000000..13bed8bfe
--- /dev/null
+++ b/krebs/nixpkgs.json
@@ -0,0 +1,7 @@
+{
+  "url": "https://github.com/NixOS/nixpkgs-channels",
+  "rev": "4df3426f5a5e78cef4835897a43abd9e2a092b74",
+  "date": "2018-08-19T09:20:40+02:00",
+  "sha256": "05k5mssiqxffxi45mss9wjns6k76i248rpasa48akdcriry1mp63",
+  "fetchSubmodules": true
+}
diff --git a/krebs/update-channel.sh b/krebs/update-channel.sh
new file mode 100755
index 000000000..47d3f29c4
--- /dev/null
+++ b/krebs/update-channel.sh
@@ -0,0 +1,9 @@
+#!/bin/sh
+dir=$(dirname $0)
+oldrev=$(cat $dir/nixpkgs.json | jq -r .rev | sed 's/\(.\{7\}\).*/\1/')
+nix-shell -p nix-prefetch-git --run 'nix-prefetch-git \
+  --url https://github.com/NixOS/nixpkgs-channels \
+  --rev refs/heads/nixos-18.03' \
+> $dir/nixpkgs.json
+newrev=$(cat $dir/nixpkgs.json | jq -r .rev | sed 's/\(.\{7\}\).*/\1/')
+git commit $dir/nixpkgs.json -m "nixpkgs: $oldrev -> $newrev"