fastbootd: Complete the implementation of getvar has-slot.

Bug: 78793464
Test: fastboot getvar has-slot:super returns "no"
Change-Id: I80f171df062c008718b810bbe12070834d4aa3fb

1 files changed, 7 insertions, 3 deletions

diff --git a/fastboot/device/variables.cpp b/fastboot/device/variables.cpp
index a5dead212..65cfea327 100644
--- a/fastboot/device/variables.cpp
+++ b/fastboot/device/variables.cpp
@@ -123,10 +123,14 @@ bool GetHasSlot(FastbootDevice* device, const std::vector<std::string>& args) {
     }
     std::string slot_suffix = device->GetCurrentSlot();
     if (slot_suffix.empty()) {
-        return device->WriteFail("Invalid slot");
+        return device->WriteOkay("no");
     }
-    std::string result = (args[0] == "userdata" ? "no" : "yes");
-    return device->WriteOkay(result);
+    std::string partition_name = args[0] + slot_suffix;
+    if (FindPhysicalPartition(partition_name) ||
+        LogicalPartitionExists(partition_name, slot_suffix)) {
+        return device->WriteOkay("yes");
+    }
+    return device->WriteOkay("no");
 }
 
 bool GetPartitionSize(FastbootDevice* device, const std::vector<std::string>& args) {