public com.google.protobuf.ByteString getSourceSnapshotBytes() {
          java.lang.Object ref = sourceSnapshot_;
          if (ref instanceof String) {
            com.google.protobuf.ByteString b =
                com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
            sourceSnapshot_ = b;
            return b;
          } else {
            return (com.google.protobuf.ByteString) ref;
          }
        }
<pre>
Optional. Name of the snapshot to use as the source for the disk. If
set,
[size_gb][google.cloud.workstations.v1.WorkstationConfig.PersistentDirectory.GceRegionalPersistentDisk.size_gb]
and
[fs_type][google.cloud.workstations.v1.WorkstationConfig.PersistentDirectory.GceRegionalPersistentDisk.fs_type]
must be empty.
</pre>

<code>string source_snapshot = 5 [(.google.api.field_behavior) = OPTIONAL];</code>

@return The bytes for sourceSnapshot.
java-workstations/proto-google-cloud-workstations-v1/src/main/java/com/google/cloud/workstations/v1/WorkstationConfig.java