fastbootd: skip COW group

Skip importing COW group because they are dynamically
created by OTA clients and will never show up in built
images.
Test: flash

Change-Id: I44e7693cfb4c15e64455b56212a02f9abde88d61

fastboot/Android.bp

@@ -143,6 +143,10 @@ cc_binary {
     static_libs: [
         "libhealthhalutils",
     ],
+
+    header_libs: [
+        "libsnapshot_headers",
+    ]
 }
 
 cc_defaults {

fastboot/device/flashing.cpp

@@ -32,6 +32,7 @@
 #include <fstab/fstab.h>
 #include <liblp/builder.h>
 #include <liblp/liblp.h>
+#include <libsnapshot/snapshot.h>
 #include <sparse/sparse.h>
 
 #include "fastboot_device.h"
@@ -171,6 +172,11 @@ bool UpdateSuper(FastbootDevice* device, const std::string& super_name, bool wip
         if (!slot_suffix.empty() && GetPartitionSlotSuffix(partition_name) == slot_suffix) {
             continue;
         }
+        std::string group_name = GetPartitionGroupName(old_metadata->groups[partition.group_index]);
+        // Skip partitions in the COW group
+        if (group_name == android::snapshot::kCowGroupName) {
+            continue;
+        }
         partitions_to_keep.emplace(partition_name);
     }
 

fs_mgr/libsnapshot/Android.bp

@@ -56,6 +56,12 @@ filegroup {
     ],
 }
 
+cc_library_headers {
+    name: "libsnapshot_headers",
+    recovery_available: true,
+    defaults: ["libsnapshot_defaults"],
+}
+
 cc_library_static {
     name: "libsnapshot",
     defaults: ["libsnapshot_defaults"],