public java.lang.String getSourceImage() {
          java.lang.Object ref = sourceImage_;
          if (!(ref instanceof java.lang.String)) {
            com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
            java.lang.String s = bs.toStringUtf8();
            sourceImage_ = s;
            return s;
          } else {
            return (java.lang.String) 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 sourceImage.
java-workstations/proto-google-cloud-workstations-v1beta/src/main/java/com/google/cloud/workstations/v1beta/WorkstationConfig.java