4 files changed, 25 insertions, 20 deletions

diff --git a/.travis.yml b/.travis.yml
index ef53f71..720eade 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,9 +4,8 @@ language: nix
 sudo: false
 
 install:
-  - nix-env -i python2.7-ansible
-  - nix-env -i python2.7-ansible-lint
-  - nix-env -if ./dhall-1.18.nix
+  - nix-env -i python2.7-ansible python2.7-ansible-lint
+  - nix-env -if ./dhall-1.21.0.nix
 
   # Check ansible version
   - ansible --version
diff --git a/dhall-1.18.nix b/dhall-1.18.nix
deleted file mode 100644
index d6522bd..0000000
--- a/dhall-1.18.nix
+++ /dev/null
@@ -1,16 +0,0 @@
-{ pkgs ? import <nixpkgs> {} }: with pkgs;
-
-stdenv.mkDerivation rec {
-  name = "dhall-${version}";
-  version = "1.18.0";
-  phases = [ "installPhase "];
-  src = fetchurl {
-    url = "https://github.com/dhall-lang/dhall-haskell/releases/download/${version}/dhall-${version}-x86_64-linux.tar.bz2";
-    sha256 = "0jvw6ss96xifb21mzpvfjzvaffcnpj0jhpc4rd36cl2r22800qgx";
-  };
-  installPhase = ''
-    mkdir -p $out/bin
-    tar -xjf $src
-    mv bin/dhall $out/bin/
-  '';
-}
diff --git a/dhall-1.21.0.nix b/dhall-1.21.0.nix
new file mode 100644
index 0000000..e53369b
--- /dev/null
+++ b/dhall-1.21.0.nix
@@ -0,0 +1,22 @@
+{ pkgs ? import <nixpkgs> {} }: with pkgs;
+
+let
+  mkVersion =
+    version: sha256:
+      stdenv.mkDerivation {
+        name = "dhall-${version}";
+        inherit version;
+        src = fetchurl {
+          url = "https://github.com/dhall-lang/dhall-haskell/releases/download/${version}/dhall-${version}-x86_64-linux.tar.bz2";
+          inherit sha256;
+        };
+        unpackPhase = ''
+          tar -xjf $src
+        '';
+        installPhase = ''
+          mkdir -p $out/bin
+          mv bin/dhall $out/bin/
+        '';
+      };
+in
+  mkVersion "1.21.0" "0x7q6v1y62fq6724kx1hcfp1fcqv3lbv33ji6jzfd5y316a31r77"
diff --git a/dhall/addon/Postgresql.dhall b/dhall/addon/Postgresql.dhall
index 9dd9744..ed6b411 100644
--- a/dhall/addon/Postgresql.dhall
+++ b/dhall/addon/Postgresql.dhall
@@ -1,3 +1,3 @@
-    let addon = constructors ./Addon.dhall
+let addon = ./Addon.dhall
 
 in  addon.Postgresql { name = "pg", env_prefix = "POSTGRESQL_ADDON" }