element-desktop.seshat: use fetchYarnDeps

pkgs/applications/networking/instant-messengers/element/seshat/default.nix

@@ -1,14 +1,17 @@
-{ lib, stdenv, rustPlatform, fetchFromGitHub, callPackage, sqlcipher, nodejs-14_x, python3, yarn, fixup_yarn_lock, CoreServices }:
+{ lib, stdenv, rustPlatform, fetchFromGitHub, callPackage, sqlcipher, nodejs-14_x, python3, yarn, fixup_yarn_lock, CoreServices, fetchYarnDeps }:
 
-rustPlatform.buildRustPackage rec {
+let
+  pinData = (builtins.fromJSON (builtins.readFile ./pin.json));
+
+in rustPlatform.buildRustPackage rec {
   pname = "seshat-node";
-  version = "2.3.0";
+  inherit (pinData) version;
 
   src = fetchFromGitHub {
     owner = "matrix-org";
     repo = "seshat";
     rev = version;
-    sha256 = "0zigrz59mhih9asmbbh38z2fg0sii2342q6q0500qil2a0rssai7";
+    sha256 = pinData.srcHash;
   };
 
   sourceRoot = "source/seshat-node/native";
@@ -18,7 +21,10 @@ rustPlatform.buildRustPackage rec {
 
   npm_config_nodedir = nodejs-14_x;
 
-  yarnOfflineCache = (callPackage ./yarn.nix {}).offline_cache;
+  yarnOfflineCache = fetchYarnDeps {
+    yarnLock = src + "/seshat-node/yarn.lock";
+    sha256 = pinData.yarnHash;
+  };
 
   buildPhase = ''
     cd ..
@@ -42,5 +48,5 @@ rustPlatform.buildRustPackage rec {
     cp -r . $out
   '';
 
-  cargoSha256 = "0habjf85mzqxwf8k15msm4cavd7ldq4zpxddkwd4inl2lkvlffqj";
+  cargoSha256 = pinData.cargoHash;
 }

pkgs/applications/networking/instant-messengers/element/seshat/pin.json

@@ -0,0 +1,6 @@
+{
+  "version": "2.3.0",
+  "srcHash": "JyqtM1CCRgxAAdhgQYaIUYPnxEcDrlW1SjDCmsrPL34=",
+  "yarnHash": "0bym6i1f0i3bs4fncbiwzwmbxp7j14rz1v4kyvsl02qs97qw1jac",
+  "cargoHash": "sha256-EjtH96SC2kgan631+wlu9LStGKm6ljCR4x3/WpCTS0E="
+}

pkgs/applications/networking/instant-messengers/element/seshat/update.sh

@@ -1,16 +1,49 @@
 #!/usr/bin/env nix-shell
-#!nix-shell -I nixpkgs=../ -i bash -p wget yarn2nix
+#!nix-shell -I nixpkgs=../../../../../../ -i bash -p wget prefetch-yarn-deps yarn nix-prefetch
 
-set -euo pipefail
-
-if [ "$#" -ne 1 ] || [[ "$1" == -* ]]; then
-  echo "Regenerates the Yarn dependency lock files."
-  echo "Usage: $0 <git release tag>"
+if [ "$#" -gt 1 ] || [[ "$1" == -* ]]; then
+  echo "Regenerates packaging data for the seshat package."
+  echo "Usage: $0 [git release tag]"
   exit 1
 fi
 
-SRC="https://raw.githubusercontent.com/matrix-org/seshat/$1"
+version="$1"
 
+set -euo pipefail
+
+if [ -z "$version" ]; then
+  version="$(wget -O- "https://api.github.com/repos/matrix-org/seshat/tags" | jq -r '.[] | .name' | sort --version-sort | tail -1)"
+fi
+
+SRC="https://raw.githubusercontent.com/matrix-org/seshat/$version"
+
+tmpdir=$(mktemp -d)
+trap 'rm -rf "$tmpdir"' EXIT
+
+pushd $tmpdir
 wget "$SRC/seshat-node/yarn.lock"
-yarn2nix > yarn.nix
-rm yarn.lock
+yarn_hash=$(prefetch-yarn-deps yarn.lock)
+popd
+
+src_hash=$(nix-prefetch-github matrix-org seshat --rev ${version} | jq -r .sha256)
+
+cat > pin.json << EOF
+{
+  "version": "$version",
+  "srcHash": "$src_hash",
+  "yarnHash": "$yarn_hash",
+  "cargoHash": "0000000000000000000000000000000000000000000000000000"
+}
+EOF
+
+cargo_hash=$(nix-prefetch "{ sha256 }: (import ../../../../../.. {}).element-desktop.seshat.cargoDeps")
+
+cat > pin.json << EOF
+{
+  "version": "$version",
+  "srcHash": "$src_hash",
+  "yarnHash": "$yarn_hash",
+  "cargoHash": "$cargo_hash"
+}
+EOF
+