public Builder mergeFrom(
            com.google.cloud.workstations.v1beta.WorkstationConfig.EphemeralDirectory
                    .GcePersistentDisk
                other) {
          if (other
              == com.google.cloud.workstations.v1beta.WorkstationConfig.EphemeralDirectory
                  .GcePersistentDisk.getDefaultInstance()) return this;
          if (!other.getDiskType().isEmpty()) {
            diskType_ = other.diskType_;
            bitField0_ |= 0x00000001;
            onChanged();
          }
          if (!other.getSourceSnapshot().isEmpty()) {
            sourceSnapshot_ = other.sourceSnapshot_;
            bitField0_ |= 0x00000002;
            onChanged();
          }
          if (!other.getSourceImage().isEmpty()) {
            sourceImage_ = other.sourceImage_;
            bitField0_ |= 0x00000004;
            onChanged();
          }
          if (other.getReadOnly() != false) {
            setReadOnly(other.getReadOnly());
          }
          this.mergeUnknownFields(other.getUnknownFields());
          onChanged();
          return this;
        }
<pre>
An EphemeralDirectory is backed by a Compute Engine persistent disk.
</pre>

Protobuf type {@code
google.cloud.workstations.v1beta.WorkstationConfig.EphemeralDirectory.GcePersistentDisk}
java-workstations/proto-google-cloud-workstations-v1beta/src/main/java/com/google/cloud/workstations/v1beta/WorkstationConfig.java