npins

default.nix

@@ -1,14 +1,8 @@
 {
   system ? builtins.currentSystem,
-  pkgs ? import (builtins.fetchTarball {
-    url = "https://github.com/nixos/nixpkgs/archive/56c0d09b76608a7fa28127a37d81d9003e46acf6.tar.gz";
-  }) { inherit system; },
-  papermod ? pkgs.fetchFromGitHub {
-    owner = "adityatelange";
-    repo = "hugo-papermod";
-    rev = "master";
-    hash = "sha256-Dv/QnYYG5KTQro95kzwgQeOS0nO2HyfBoSou5AsCFAI=";
-  },
+  sources ? import ./npins,
+  pkgs ? import sources.nixpkgs { inherit system; },
+  papermod ? sources.hugo-papermod,
 }:
 pkgs.stdenv.mkDerivation {
   name = "website";

npins/default.nix

@@ -0,0 +1,80 @@
+# Generated by npins. Do not modify; will be overwritten regularly
+let
+  data = builtins.fromJSON (builtins.readFile ./sources.json);
+  version = data.version;
+
+  mkSource =
+    spec:
+    assert spec ? type;
+    let
+      path =
+        if spec.type == "Git" then
+          mkGitSource spec
+        else if spec.type == "GitRelease" then
+          mkGitSource spec
+        else if spec.type == "PyPi" then
+          mkPyPiSource spec
+        else if spec.type == "Channel" then
+          mkChannelSource spec
+        else
+          builtins.throw "Unknown source type ${spec.type}";
+    in
+    spec // { outPath = path; };
+
+  mkGitSource =
+    {
+      repository,
+      revision,
+      url ? null,
+      hash,
+      branch ? null,
+      ...
+    }:
+    assert repository ? type;
+    # At the moment, either it is a plain git repository (which has an url), or it is a GitHub/GitLab repository
+    # In the latter case, there we will always be an url to the tarball
+    if url != null then
+      (builtins.fetchTarball {
+        inherit url;
+        sha256 = hash; # FIXME: check nix version & use SRI hashes
+      })
+    else
+      assert repository.type == "Git";
+      let
+        urlToName =
+          url: rev:
+          let
+            matched = builtins.match "^.*/([^/]*)(\\.git)?$" repository.url;
+
+            short = builtins.substring 0 7 rev;
+
+            appendShort = if (builtins.match "[a-f0-9]*" rev) != null then "-${short}" else "";
+          in
+          "${if matched == null then "source" else builtins.head matched}${appendShort}";
+        name = urlToName repository.url revision;
+      in
+      builtins.fetchGit {
+        url = repository.url;
+        rev = revision;
+        inherit name;
+        # hash = hash;
+      };
+
+  mkPyPiSource =
+    { url, hash, ... }:
+    builtins.fetchurl {
+      inherit url;
+      sha256 = hash;
+    };
+
+  mkChannelSource =
+    { url, hash, ... }:
+    builtins.fetchTarball {
+      inherit url;
+      sha256 = hash;
+    };
+in
+if version == 3 then
+  builtins.mapAttrs (_: mkSource) data.pins
+else
+  throw "Unsupported format version ${toString version} in sources.json. Try running `npins upgrade`"

npins/sources.json

@@ -0,0 +1,23 @@
+{
+  "pins": {
+    "hugo-papermod": {
+      "type": "Git",
+      "repository": {
+        "type": "GitHub",
+        "owner": "adityatelange",
+        "repo": "hugo-papermod"
+      },
+      "branch": "master",
+      "revision": "9f1f414be805a2f94e2f51bd4be2b365ff12386d",
+      "url": "https://github.com/adityatelange/hugo-papermod/archive/9f1f414be805a2f94e2f51bd4be2b365ff12386d.tar.gz",
+      "hash": "1195j3bha85iyd8ll5x2lrq8y4an52vd2gbfzgcvpxr0lck85a2x"
+    },
+    "nixpkgs": {
+      "type": "Channel",
+      "name": "nixpkgs-unstable",
+      "url": "https://releases.nixos.org/nixpkgs/nixpkgs-25.05pre738273.0bd024d34eb0/nixexprs.tar.xz",
+      "hash": "1i9krk68w7k19wzhfybmzgxyf9v24bpbr1hrlj840yd4c5hx3fnn"
+    }
+  },
+  "version": 3
+}