Expose Get/Set BootSourceOverrideTarget via SystemRegistry

Expose BootSourceOverrideTarget getter and setter in tlbmc SystemRegistry HAL to support Redfish out-of-band boot configuration.

Similar to BootNext, BootSourceOverrideTarget maps to gbmc-settings backed storage for out-of-band boot configuration.

- Add GetBootSourceOverrideTarget and SetBootSourceOverrideTarget to SystemRegistry interface.
- Implement methods in SystemRegistryImpl delegating to SettingsManager.
- Add mock methods in MockSystemRegistry.
- Add unit tests in system_registry_impl_test covering default, update, and invalid ID handling.

Google-Bug-Id:539553711
PiperOrigin-RevId: 982171562
Change-Id: I7eb62bdcd37c9aeae738636f0e35ba3fb88d5e6b

tlbmc/hal/system_registry.h

diff --git a/tlbmc/hal/system_registry.h b/tlbmc/hal/system_registry.h
index 80ab56f..e58cff4 100644
--- a/tlbmc/hal/system_registry.h
+++ b/tlbmc/hal/system_registry.h
@@ -5,6 +5,7 @@
 #include <string>
 #include <string_view>
 
+#include "gbmc_settings/bios_settings.pb.h"
 #include "absl/status/status.h"
 #include "absl/status/statusor.h"
 
@@ -63,6 +64,28 @@
                                    std::string_view boot_next) = 0;
 
   /**
+   * @brief Retrieves the BootSourceOverrideTarget setting for a given Redfish
+   * system ID.
+   * @param redfish_system_id The Redfish system ID, e.g. "system" or "system1"
+   * @return The BootSourceOverrideTarget value as an enum, or an error status
+   * (e.g. kNotFound).
+   */
+  virtual absl::StatusOr<::gbmc::settings::BootSourceOverrideTarget>
+  GetBootSourceOverrideTarget(std::string_view redfish_system_id) = 0;
+
+  /**
+   * @brief Sets the BootSourceOverrideTarget setting for a given Redfish system
+   * ID.
+   * @param redfish_system_id The Redfish system ID, e.g. "system" or "system1"
+   * @param boot_source_override_target The boot source override target to set.
+   * @return absl::OkStatus() on success, or an error status on failure.
+   */
+  virtual absl::Status SetBootSourceOverrideTarget(
+      std::string_view redfish_system_id,
+      ::gbmc::settings::BootSourceOverrideTarget
+          boot_source_override_target) = 0;
+
+  /**
    * @brief Retrieves the Memory Capacity (in GiB) for a given Redfish system
    * ID.
    * @param redfish_system_id The Redfish system ID, e.g. "system" or "system1"

tlbmc/hal/system_registry_impl.cc

diff --git a/tlbmc/hal/system_registry_impl.cc b/tlbmc/hal/system_registry_impl.cc
index b189b72..b487daf 100644
--- a/tlbmc/hal/system_registry_impl.cc
+++ b/tlbmc/hal/system_registry_impl.cc
@@ -25,6 +25,7 @@
 
 namespace milotic_tlbmc {
 
+using ::gbmc::settings::BootSourceOverrideTarget;
 using ::gbmc::settings::GbmcSettings;
 using ::gbmc::settings::SystemId;
 using ::platforms::gbmc::hal::BiosConfigRegistry;
@@ -274,6 +275,23 @@
   return settings_manager_->SetBiosSettingsBootNext(system_id, boot_next);
 }
 
+absl::StatusOr<BootSourceOverrideTarget>
+SystemRegistryImpl::GetBootSourceOverrideTarget(
+    std::string_view redfish_system_id) {
+  ECCLESIA_ASSIGN_OR_RETURN(SystemId system_id,
+                            RedfishSystemIdToSystemId(redfish_system_id));
+  return settings_manager_->GetBiosSettingsBootSourceOverrideTarget(system_id);
+}
+
+absl::Status SystemRegistryImpl::SetBootSourceOverrideTarget(
+    std::string_view redfish_system_id,
+    BootSourceOverrideTarget boot_source_override_target) {
+  ECCLESIA_ASSIGN_OR_RETURN(SystemId system_id,
+                            RedfishSystemIdToSystemId(redfish_system_id));
+  return settings_manager_->SetBiosSettingsBootSourceOverrideTarget(
+      system_id, boot_source_override_target);
+}
+
 absl::StatusOr<uint32_t> SystemRegistryImpl::GetMemoryCapacityGib(
     std::string_view redfish_system_id) {
   if (all_registries_.bios_config == nullptr) {

tlbmc/hal/system_registry_impl.h

diff --git a/tlbmc/hal/system_registry_impl.h b/tlbmc/hal/system_registry_impl.h
index 6260a27..ab315c7 100644
--- a/tlbmc/hal/system_registry_impl.h
+++ b/tlbmc/hal/system_registry_impl.h
@@ -71,6 +71,14 @@
   absl::Status SetBootNext(std::string_view redfish_system_id,
                            std::string_view boot_next) override;
 
+  absl::StatusOr<::gbmc::settings::BootSourceOverrideTarget>
+  GetBootSourceOverrideTarget(std::string_view redfish_system_id) override;
+
+  absl::Status SetBootSourceOverrideTarget(
+      std::string_view redfish_system_id,
+      ::gbmc::settings::BootSourceOverrideTarget boot_source_override_target)
+      override;
+
   absl::StatusOr<uint32_t> GetMemoryCapacityGib(
       std::string_view redfish_system_id) override;
 

tlbmc/hal/system_registry_mock.h

diff --git a/tlbmc/hal/system_registry_mock.h b/tlbmc/hal/system_registry_mock.h
index f536e39..64c58ee 100644
--- a/tlbmc/hal/system_registry_mock.h
+++ b/tlbmc/hal/system_registry_mock.h
@@ -5,6 +5,7 @@
 #include <string>
 #include <string_view>
 
+#include "gbmc_settings/bios_settings.pb.h"
 #include <gmock/gmock.h>
 #include "absl/status/status.h"
 #include "absl/status/statusor.h"
@@ -28,6 +29,11 @@
               (override));
   MOCK_METHOD(absl::Status, SetBootNext, (std::string_view, std::string_view),
               (override));
+  MOCK_METHOD(absl::StatusOr<::gbmc::settings::BootSourceOverrideTarget>,
+              GetBootSourceOverrideTarget, (std::string_view), (override));
+  MOCK_METHOD(absl::Status, SetBootSourceOverrideTarget,
+              (std::string_view, ::gbmc::settings::BootSourceOverrideTarget),
+              (override));
   MOCK_METHOD(absl::StatusOr<uint32_t>, GetMemoryCapacityGib,
               (std::string_view), (override));
   MOCK_METHOD(absl::Status, SetMemoryCapacityGib, (std::string_view, uint32_t),