nixos: Add latest xochitl version

Author: timower

nix/pkgs/rm-emu/default.nix

@@ -7,6 +7,9 @@ let
   kernel = pkgsLinux.callPackage ./kernel.nix { };
 
   versions = import ./versions.nix { inherit lib; };
+  latestVersion = builtins.head (
+    builtins.attrNames (lib.attrsets.filterAttrs (v: i: i.isLatest) versions)
+  );
 
   extractor = pkgsLinux.callPackage ./extractor.nix { };
 
@@ -51,7 +54,7 @@ in
 {
   rm-emu-kernel = kernel;
   rm-emu-extractor = extractor;
-  rm-emu = allEmus."rm-emu-3.20.0.92";
+  rm-emu = allEmus."rm-emu-${latestVersion}";
 }
 // allEmus
 // allRootFs'

nix/pkgs/rm-emu/fetch-update.sh

@@ -0,0 +1,3 @@
+url=$(curl --header "Memfault-Project-Key: JLPsMk3iNn9rmBptmhVq2NYtO4RaiFM7" "https://device.cloud.remarkable.com/api/v0/releases/latest?hardware_version=reMarkable2&software_type=device" | jq -r '.artifacts[0].url')
+echo "Downloading $url"
+curl -o $out "$url"

nix/pkgs/rm-emu/rootfs.nix

@@ -1,5 +1,6 @@
 {
   lib,
+  stdenvNoCC,
   fetchurl,
   runCommand,
 
@@ -10,6 +11,10 @@
   dosfstools,
   e2fsprogs,
 
+  cacert,
+  curl,
+  jq,
+
   extractor,
 
   fw_version,
@@ -18,7 +23,7 @@
   extraCommands ? null,
 }:
 let
-  inherit (fw_info) fileName fileHash;
+  inherit (fw_info) fileName fileHash isLatest;
 
   base_url = "https://updates-download.cloud.remarkable.engineering/build/reMarkable%20Device%20Beta/RM110"; # Default URL for v2 versions
   base_url_v3 = "https://updates-download.cloud.remarkable.engineering/build/reMarkable%20Device/reMarkable2";
@@ -33,10 +38,27 @@ let
     else
       "${base_url}/${fw_version}/${fw_version}_reMarkable2-${fileName}.signed";
 
-  updateArchive = fetchurl {
-    inherit url;
-    sha256 = fileHash;
-  };
+  updateArchive =
+    if isLatest then
+      stdenvNoCC.mkDerivation {
+        name = fileName;
+
+        nativeBuildInputs = [
+          curl
+          jq
+        ];
+        builder = ./fetch-update.sh;
+        SSL_CERT_FILE = "${cacert}/etc/ssl/certs/ca-bundle.crt";
+
+        outputHashAlgo = "sha256";
+        outputHashMode = "flat";
+        outputHash = fileHash;
+      }
+    else
+      fetchurl {
+        inherit url;
+        sha256 = fileHash;
+      };
 
   rootfsImageOld = runCommand "rm-rootfs.ext4" { nativeBuildInputs = [ extractor ]; } ''
     extractor ${updateArchive} $out

nix/pkgs/rm-emu/versions.nix

@@ -12,4 +12,12 @@ in
 builtins.mapAttrs (version: info: {
   fileName = builtins.elemAt info 0;
   fileHash = builtins.elemAt info 1;
+  isLatest = false;
 }) codexUpdateData.remarkable2
+// {
+  "3.22.0.64" = {
+    isLatest = true;
+    fileName = "remarkable-production-image-3.22.0.64-rm2-public.swu";
+    fileHash = "sha256-NmLn8Ogn1jHJmoRHA4//dxC20shAScpNBhYmd/Gxqoo=";
+  };
+}