Default device_supported and host_supported to true in serde.

This is cleaner than using .unwrap_or(true) wherever they are used.

Bug: 293289578
Test: atest cargo_embargo.test
Change-Id: I763adf0cc51721408adf55b966ed4304e2766c00

tools/cargo_embargo/src/config.rs

@@ -75,15 +75,15 @@ pub struct Config {
 
 /// Options that apply to everything in a package (i.e. everything associated with a particular
 /// Cargo.toml file).
-#[derive(Deserialize, Default)]
+#[derive(Deserialize)]
 #[serde(deny_unknown_fields)]
 pub struct PackageConfig {
     /// Whether to compile for device. Defaults to true.
-    #[serde(default)]
-    pub device_supported: Option<bool>,
+    #[serde(default = "default_true")]
+    pub device_supported: bool,
     /// Whether to compile for host. Defaults to true.
-    #[serde(default)]
-    pub host_supported: Option<bool>,
+    #[serde(default = "default_true")]
+    pub host_supported: bool,
     /// Generate "rust_library_rlib" instead of "rust_library".
     #[serde(default)]
     pub force_rlib: bool,
@@ -107,3 +107,19 @@ pub struct PackageConfig {
     #[serde(default)]
     pub copy_out: bool,
 }
+
+impl Default for PackageConfig {
+    fn default() -> Self {
+        Self {
+            device_supported: true,
+            host_supported: true,
+            force_rlib: false,
+            no_presubmit: false,
+            add_toplevel_block: None,
+            add_module_block: None,
+            dep_blocklist: Default::default(),
+            patch: None,
+            copy_out: false,
+        }
+    }
+}

tools/cargo_embargo/src/main.rs

@@ -403,7 +403,7 @@ fn crate_to_bp_modules(
 ) -> Result<Vec<BpModule>> {
     let mut modules = Vec::new();
     for crate_type in &crate_.types {
-        let host = if package_cfg.device_supported.unwrap_or(true) { "" } else { "_host" };
+        let host = if package_cfg.device_supported { "" } else { "_host" };
         let rlib = if package_cfg.force_rlib { "_rlib" } else { "" };
         let (module_type, module_name, stem) = match crate_type {
             CrateType::Bin => {
@@ -458,8 +458,8 @@ fn crate_to_bp_modules(
             m.props.set("defaults", vec![defaults.clone()]);
         }
 
-        if package_cfg.host_supported.unwrap_or(true)
-            && package_cfg.device_supported.unwrap_or(true)
+        if package_cfg.host_supported
+            && package_cfg.device_supported
             && module_type != "rust_proc_macro"
         {
             m.props.set("host_supported", true);
@@ -475,7 +475,7 @@ fn crate_to_bp_modules(
         if crate_.types.contains(&CrateType::Test) {
             m.props.set("test_suites", vec!["general-tests"]);
             m.props.set("auto_gen_config", true);
-            if package_cfg.host_supported.unwrap_or(true) {
+            if package_cfg.host_supported {
                 m.props.object("test_options").set("unit_test", !package_cfg.no_presubmit);
             }
         }