macos update

template/devenv.nix

@@ -1,5 +1,14 @@
 { pkgs, lib, config, inputs, ... }:
-
+<@if(eq(context.project.mobile,"expo"))>
+let
+  # Sets dev_dir to Xcode's developer dir. devenv points DEVELOPER_DIR at the Nix SDK,
+  # which xcode-select would echo back, so it is unset for the lookup.
+  xcodeDevDir = ''
+    dev_dir="$(/usr/bin/env -u DEVELOPER_DIR /usr/bin/xcode-select -p 2>/dev/null)"
+    [ -x "$dev_dir/usr/bin/simctl" ] || dev_dir=/Applications/Xcode.app/Contents/Developer
+  '';
+in
+<@endif>
 {
   packages = [
      pkgs.bun
@@ -33,6 +42,8 @@
   # The emulator's bundled libs are only needed on Linux; macOS uses DYLD paths.
   enterShell = lib.optionalString pkgs.stdenv.isLinux ''
     export LD_LIBRARY_PATH=$ANDROID_HOME/emulator/lib64:$LD_LIBRARY_PATH
+  '' + lib.optionalString pkgs.stdenv.isDarwin ''
+    ios-check || true
   '';
   # Use a system image matching the host CPU (arm64 on Apple Silicon, x86_64 elsewhere).
   scripts.create-avd.exec = ''
@@ -40,16 +51,39 @@
       echo no | avdmanager create avd -n "Pixel_5_API34" -k "system-images;android-34;google_apis_playstore;${if pkgs.stdenv.hostPlatform.isAarch64 then "arm64-v8a" else "x86_64"}" -d "pixel_5"
     fi
   '';
-  # macOS only: run on the iOS simulator when Xcode with a simulator is installed.
+  # macOS only: Nix can't provide Xcode, so report what the iOS build still needs.
+  scripts.ios-check = lib.mkIf pkgs.stdenv.isDarwin {
+    exec = ''
+      ${xcodeDevDir}
+      export DEVELOPER_DIR="$dev_dir"
+      problems=""
+      missing() { problems+="  - $1"$'\n'; }
+      if [ ! -x "$dev_dir/usr/bin/simctl" ]; then
+        missing "Xcode is not installed. Install it from the App Store: https://apps.apple.com/app/xcode/id497799835"
+      else
+        if ! /usr/bin/xcodebuild -license check >/dev/null 2>&1 || ! /usr/bin/xcodebuild -checkFirstLaunchStatus >/dev/null 2>&1; then
+          missing "Xcode setup is incomplete (license or first-launch components). Run: sudo xcodebuild -runFirstLaunch"
+        fi
+        if ! /usr/bin/xcrun simctl list runtimes 2>/dev/null | grep -q '^iOS '; then
+          missing "No iOS simulator runtime is installed. Run: xcodebuild -downloadPlatform iOS"
+        elif ! /usr/bin/xcrun simctl list devices available 2>/dev/null | grep -q iPhone; then
+          missing "No iPhone simulator exists. Create one in Xcode > Window > Devices and Simulators"
+        fi
+      fi
+      if [ -n "$problems" ]; then
+        printf 'iOS simulator builds are disabled until this is fixed:\n%s' "$problems" >&2
+        exit 1
+      fi
+    '';
+  };
+  # macOS only: run on the iOS simulator when ios-check passes.
   scripts.run-ios = lib.mkIf pkgs.stdenv.isDarwin {
     exec = ''
-      # devenv points DEVELOPER_DIR at the Nix SDK, which xcode-select would echo back.
-      dev_dir="$(/usr/bin/env -u DEVELOPER_DIR /usr/bin/xcode-select -p 2>/dev/null)"
-      [ -x "$dev_dir/usr/bin/simctl" ] || dev_dir=/Applications/Xcode.app/Contents/Developer
-      if ! DEVELOPER_DIR="$dev_dir" /usr/bin/xcrun simctl list devices available 2>/dev/null | grep -q iPhone; then
-        echo "No Xcode iOS simulator found, skipping iOS."
+      if ! ios-check; then
+        echo "Skipping iOS."
         exit 0
       fi
+      ${xcodeDevDir}
       # devenv's Nix Apple SDK, xcrun and compiler wrappers break xcodebuild, so build in a clean env.
       exec /usr/bin/env -i HOME="$HOME" USER="$USER" TERM="$TERM" LANG=en_US.UTF-8 \
         DEVELOPER_DIR="$dev_dir" \
@@ -110,7 +144,12 @@
       after = ["devenv:processes:createavd@completed"];
     };
     expodev = {
-      exec = "bunx expo run:android";
+      # Wait for the emulator to finish booting, otherwise expo tries to start a second copy of the AVD.
+      exec = ''
+        adb -e wait-for-device
+        until [ "$(adb -e shell getprop sys.boot_completed 2>/dev/null | tr -d '\r')" = 1 ]; do sleep 2; done
+        bunx expo run:android
+      '';
       cwd = "./apps/mobile";
       after= ["devenv:processes:emulator@started"];
       restart = {