init: replacing fs_mgr_read_fstab() with fs_mgr_read_fstab_default()

The original default /fstab.{ro.hardware} might be moved to
/vendor/etc/. or /odm/etc/. Use the new API to get the default
fstab instead of using the hard-coded /fstab.{ro.hardware}.

Bug: 35811655
Test: boot marlin with /vendor/etc/fstab.marlin

Change-Id: I8a9c70eda7f68b174ec355910d0fa1eb18a46e21

init/property_service.cpp

@@ -62,7 +62,6 @@
 using android::base::StringPrintf;
 
 #define PERSISTENT_PROPERTY_DIR  "/data/property"
-#define FSTAB_PREFIX "/fstab."
 #define RECOVERY_MOUNT_POINT "/recovery"
 
 static int persistent_properties_loaded = 0;
@@ -613,21 +612,14 @@ void load_persist_props(void) {
 }
 
 void load_recovery_id_prop() {
-    std::string ro_hardware = property_get("ro.hardware");
-    if (ro_hardware.empty()) {
-        LOG(ERROR) << "ro.hardware not set - unable to load recovery id";
+    std::unique_ptr<fstab, decltype(&fs_mgr_free_fstab)> fstab(fs_mgr_read_fstab_default(),
+                                                               fs_mgr_free_fstab);
+    if (!fstab) {
+        PLOG(ERROR) << "unable to read default fstab";
         return;
     }
-    std::string fstab_filename = FSTAB_PREFIX + ro_hardware;
 
-    std::unique_ptr<fstab, void(*)(fstab*)> tab(fs_mgr_read_fstab(fstab_filename.c_str()),
-                                                fs_mgr_free_fstab);
-    if (!tab) {
-        PLOG(ERROR) << "unable to read fstab " << fstab_filename;
-        return;
-    }
-
-    fstab_rec* rec = fs_mgr_get_entry_for_mount_point(tab.get(), RECOVERY_MOUNT_POINT);
+    fstab_rec* rec = fs_mgr_get_entry_for_mount_point(fstab.get(), RECOVERY_MOUNT_POINT);
     if (rec == NULL) {
         LOG(ERROR) << "/recovery not specified in fstab";
         return;