public com.google.protobuf.ByteString getSourceImageBytes() {
          java.lang.Object ref = sourceImage_;
          if (ref instanceof String) {
            com.google.protobuf.ByteString b =
                com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
            sourceImage_ = b;
            return b;
          } else {
            return (com.google.protobuf.ByteString) ref;
          }
        }
<pre>
Optional. Name of the disk image to use as the source for the disk.
Must be empty if
[source_snapshot][google.cloud.workstations.v1beta.WorkstationConfig.EphemeralDirectory.GcePersistentDisk.source_snapshot]
is set. Updating
[source_image][google.cloud.workstations.v1beta.WorkstationConfig.EphemeralDirectory.GcePersistentDisk.source_image]
will update content in the ephemeral directory after the workstation is
restarted. This field is mutable.
</pre>

<code>string source_image = 3 [(.google.api.field_behavior) = OPTIONAL];</code>

@return The bytes for sourceImage.
java-workstations/proto-google-cloud-workstations-v1beta/src/main/java/com/google/cloud/workstations/v1beta/WorkstationConfig.java