Adds Commons IO rule to the cloud-readiness/local-storage ruleset

rules/rules-reviewed/cloud-readiness/local-storage.windup.xml

@@ -213,5 +213,43 @@
               </iteration>
             </perform>
         </rule>
+        <rule id="local-storage-00006">
+            <when>
+                <or>
+                    <javaclass references="org.apache.commons.io.input.{*}">
+                        <location>IMPORT</location>
+                    </javaclass>
+                    <javaclass references="org.apache.commons.io.output.{*}">
+                        <location>IMPORT</location>
+                    </javaclass>
+                </or>
+            </when>
+            <perform>
+                <iteration>
+                    <hint title="Apache Commons I/O" effort="1" category-id="cloud-mandatory">
+                        <message>
+                            An application running inside a container could lose access to a file in local storage.
+
+                            Recommendations
+
+                            The following recommendations depend on the function of the file in local storage:
+
+                            * Logging: Log to standard output and use a centralized log collector to analyze the logs.
+                            * Caching: Use a cache backing service.
+                            * Configuration: Store configuration settings in environment variables so that they can be updated without code changes.
+                            * Data storage: Use a database backing service for relational data or use a persistent data storage system.
+                            * Temporary data storage: Use the file system of a running container as a brief, single-transaction cache.
+                        </message>
+                        <link href="https://12factor.net/logs" title="Twelve-Factor App: Logs"/>
+                        <link href="https://docs.openshift.com/container-platform/4.5/logging/cluster-logging.html" title="OpenShift Container Platform: Understanding cluster logging"/>
+                        <link href="https://12factor.net/backing-services" title="Twelve-Factor App: Backing services"/>
+                        <link href="https://12factor.net/config" title="Twelve-Factor App: Config"/>
+                        <link href="https://docs.openshift.com/container-platform/4.5/builds/creating-build-inputs.html#builds-input-secrets-configmaps_creating-build-inputs" title="OpenShift Container Platform: Input secrets and ConfigMaps"/>
+                        <link href="https://docs.openshift.com/container-platform/4.5/storage/understanding-persistent-storage.html" title="OpenShift Container Platform: Understanding persistent storage"/>
+                        <tag>storage</tag>
+                    </hint>
+                </iteration>
+            </perform>
+        </rule>
     </rules>
 </ruleset>

rules/rules-reviewed/cloud-readiness/tests/data/CommonIO.java

@@ -0,0 +1,17 @@
+import org.apache.commons.io.input.TeeInputStream;
+import org.apache.commons.io.output.ByteArrayOutputStream;
+import org.apache.commons.io.output.TeeOutputStream;
+
+public class CommonsIO {
+
+    public static void main(String[] args) throws IOException {
+        String str = "Hello World.";
+        ByteArrayInputStream inputStream = new ByteArrayInputStream(str.getBytes());
+        ByteArrayOutputStream outputStream1 = new ByteArrayOutputStream();
+        ByteArrayOutputStream outputStream2 = new ByteArrayOutputStream();
+
+        FilterOutputStream teeOutputStream
+            = new TeeOutputStream(outputStream1, outputStream2);
+        new TeeInputStream(inputStream, teeOutputStream, true).read(new byte[str.length()]);
+    }
+}

rules/rules-reviewed/cloud-readiness/tests/local-storage.windup.test.xml

@@ -8,7 +8,7 @@
             <rule id="local-storage-test-00001">
                 <when>
                     <not>
-                        <iterable-filter size="48">
+                        <iterable-filter size="51">
                             <hint-exists message="An application running inside a container could lose access to a file in local storage" />
                         </iterable-filter>
                     </not>