servicemanager: getUpdatableNames()

This new method is a reverse of updatableViaApex(). It returns the list
of declared instances which can be updated via the passed APEX.

Updatable vendor apexes are supposed to be used only to update HAL
services. APEXd can use this method to see if the target APEX is
actually to updating HALs.

It's not exposed to NDK/Java yet because there's no clients.

Bug: 254201177
Test: TBD
Change-Id: I7b5aa7d00a3ddeb13855816006a9561dfa601529

1 files changed, 18 insertions, 0 deletions

diff --git a/libs/binder/IServiceManager.cpp b/libs/binder/IServiceManager.cpp
index 05db7743f2..a0c43349a7 100644
--- a/libs/binder/IServiceManager.cpp
+++ b/libs/binder/IServiceManager.cpp
@@ -81,6 +81,7 @@ public:
     bool isDeclared(const String16& name) override;
     Vector<String16> getDeclaredInstances(const String16& interface) override;
     std::optional<String16> updatableViaApex(const String16& name) override;
+    Vector<String16> getUpdatableNames(const String16& apexName) override;
     std::optional<IServiceManager::ConnectionInfo> getConnectionInfo(const String16& name) override;
     class RegistrationWaiter : public android::os::BnServiceCallback {
     public:
@@ -479,6 +480,23 @@ std::optional<String16> ServiceManagerShim::updatableViaApex(const String16& nam
     return declared ? std::optional<String16>(String16(declared.value().c_str())) : std::nullopt;
 }
 
+Vector<String16> ServiceManagerShim::getUpdatableNames(const String16& apexName) {
+    std::vector<std::string> out;
+    if (Status status = mTheRealServiceManager->getUpdatableNames(String8(apexName).c_str(), &out);
+        !status.isOk()) {
+        ALOGW("Failed to getUpdatableNames for %s: %s", String8(apexName).c_str(),
+              status.toString8().c_str());
+        return {};
+    }
+
+    Vector<String16> res;
+    res.setCapacity(out.size());
+    for (const std::string& instance : out) {
+        res.push(String16(instance.c_str()));
+    }
+    return res;
+}
+
 std::optional<IServiceManager::ConnectionInfo> ServiceManagerShim::getConnectionInfo(
         const String16& name) {
     std::optional<os::ConnectionInfo> connectionInfo;