3 files changed, 33 insertions, 32 deletions

diff --git a/default.nix b/default.nix
index 3772d44..c32d23f 100644
--- a/default.nix
+++ b/default.nix
@@ -1,10 +1,5 @@
-with import (builtins.fetchTarball {
-  # FIXME: upgrade to nixpkgs 19 when stable and stick to stable
-  # versions
-  name = "nixos-unstable-2018-12-08";
-  url = https://github.com/nixos/nixpkgs/archive/61c3169a0e17d789c566d5b241bfe309ce4a6275.tar.gz;
-  sha256 = "0qbycg7wkb71v20rchlkafrjfpbk2fnlvvbh3ai9pyfisci5wxvq";
-}) {};
+with import ./libs.nix;
+with nixpkgs_unstable;
 let
   stable_nixpkgs = import <nixpkgs> {};
   mypkgs = {};
@@ -23,24 +18,6 @@ let
     }
   '';
 
-  fetchedGithub = path:
-    let
-      json = lib.importJSON path;
-    in rec {
-      version = json.tag;
-      name = "${json.meta.name}-${version}";
-      src = fetchFromGitHub json.github;
-    };
-
-  fetchedGit = path:
-    let
-      json = lib.importJSON path;
-    in rec {
-      version = json.tag;
-      name = "${json.meta.name}-${version}";
-      src = fetchgit json.git;
-    };
-
   mypkgs.ledger = (ledger.override { boost = boost166; }).overrideAttrs (_old:
     fetchedGithub ./fetched/ledger.json // {
       postInstall = "";
diff --git a/libs.nix b/libs.nix
new file mode 100644
index 0000000..da13a03
--- /dev/null
+++ b/libs.nix
@@ -0,0 +1,29 @@
+let nixpkgs_unstable = import (builtins.fetchTarball {
+  # FIXME: upgrade to nixpkgs 19 when stable and stick to stable
+  # versions
+  name = "nixos-unstable-2018-12-08";
+  url = https://github.com/nixos/nixpkgs/archive/61c3169a0e17d789c566d5b241bfe309ce4a6275.tar.gz;
+  sha256 = "0qbycg7wkb71v20rchlkafrjfpbk2fnlvvbh3ai9pyfisci5wxvq";
+}) {};
+in
+  with nixpkgs_unstable;
+{
+  inherit nixpkgs_unstable;
+  fetchedGithub = path:
+    let
+      json = lib.importJSON path;
+    in rec {
+      version = json.tag;
+      name = "${json.meta.name}-${version}";
+      src = fetchFromGitHub json.github;
+    };
+
+  fetchedGit = path:
+    let
+      json = lib.importJSON path;
+    in rec {
+      version = json.tag;
+      name = "${json.meta.name}-${version}";
+      src = fetchgit json.git;
+    };
+}
diff --git a/virtual/packages.nix b/virtual/packages.nix
index 3e143a1..05b0e88 100644
--- a/virtual/packages.nix
+++ b/virtual/packages.nix
@@ -1,10 +1,5 @@
-with import (builtins.fetchTarball {
-  # FIXME: upgrade to nixpkgs 19 when stable and stick to stable
-  # versions
-  name = "nixos-unstable-2018-12-08";
-  url = https://github.com/nixos/nixpkgs/archive/61c3169a0e17d789c566d5b241bfe309ce4a6275.tar.gz;
-  sha256 = "0qbycg7wkb71v20rchlkafrjfpbk2fnlvvbh3ai9pyfisci5wxvq";
-}) {};
+with import ../libs.nix;
+with nixpkgs_unstable;
 let
   adminer = rec {
     webRoot = pkgs.stdenv.mkDerivation rec {