fix: made the macos app smaller

test/bds/mac_bundle_test.exs

@@ -436,6 +436,8 @@ defmodule BDS.MacBundleTest do
       File.write!(Path.join(release, "bin/bds"), "#!/bin/sh\necho fake release\n")
       File.mkdir_p!(Path.join(release, "lib/wx-2.4/priv"))
       File.write!(Path.join(release, "lib/wx-2.4/priv/wxe_driver.so"), "fake-nif")
+      File.mkdir_p!(Path.join(release, "releases/0.1.0"))
+      File.write!(Path.join(release, "releases/0.1.0/env.sh"), "# env")
 
       icns = Path.join(tmp, "AppIcon.icns")
       File.write!(icns, "fake-icns")
@@ -489,5 +491,28 @@ defmodule BDS.MacBundleTest do
       assert File.exists?(Path.join(app, "Contents/Resources/rel/bin/bds"))
       assert File.exists?(Path.join(app, "Contents/Resources/AppIcon.icns"))
     end
+
+    test "refuses a half-assembled release and keeps the previous bundle", %{app: app} do
+      # A failed `mix release` leaves lib/ but no releases/<version>/env.sh.
+      tmp = Path.join(System.tmp_dir!(), "bds-macbundle-broken-#{System.unique_integer([:positive])}")
+      broken = Path.join(tmp, "rel")
+      File.mkdir_p!(Path.join(broken, "bin"))
+      File.mkdir_p!(Path.join(broken, "lib/wx-2.4/priv"))
+      on_exit(fn -> File.rm_rf!(tmp) end)
+
+      assert {:error, {:incomplete_release, message}} =
+               MacBundle.assemble(
+                 release_dir: broken,
+                 output_dir: Path.dirname(app),
+                 icns_path: Path.join(tmp, "missing.icns"),
+                 version: "0.1.0",
+                 skip_dylibs: true,
+                 skip_codesign: true
+               )
+
+      assert message =~ "mix release"
+      # the refused build must not have wiped the existing bundle
+      assert File.exists?(Path.join(app, "Contents/Resources/rel/bin/bds"))
+    end
   end
 end