kl0u commented on a change in pull request #7003: [FLINK-10633][prometheus] Add 
E2E test
URL: https://github.com/apache/flink/pull/7003#discussion_r230403257
 
 

 ##########
 File path: 
flink-end-to-end-tests/flink-end-to-end-tests-common/src/main/java/org/apache/flink/tests/util/CommandLineWrapper.java
 ##########
 @@ -0,0 +1,154 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.tests.util;
+
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Utility class for setting up command-line tool usages in a readable fashion.
+ */
+public enum CommandLineWrapper {
+       ;
+
+       public static WGetBuilder wget(String url) {
+               return new WGetBuilder(url);
+       }
+
+       /**
+        * Wrapper around wget used for downloading files.
+        */
+       public static final class WGetBuilder {
+
+               private final String url;
+               private Path targetDir;
+
+               WGetBuilder(String url) {
+                       this.url = url;
+               }
+
+               public WGetBuilder targetDir(Path dir) {
+                       this.targetDir = dir;
+                       return this;
+               }
+
+               public String[] build() {
+                       final List<String> commandsList = new ArrayList<>(5);
+                       commandsList.add("wget");
+                       commandsList.add("-q"); // silent
+                       //commandsList.add("--show-progress"); // enable 
progress bar
+                       if (targetDir != null) {
+                               commandsList.add("-P");
+                               
commandsList.add(targetDir.toAbsolutePath().toString());
+                       }
+                       commandsList.add(url);
+                       return commandsList.toArray(new 
String[commandsList.size()]);
+               }
+       }
+
+       public static SedBuilder sed(final String command, final Path file) {
+               return new SedBuilder(command, file);
+       }
+
+       /**
+        * Wrapper around sed used for processing text.
+        */
+       public static final class SedBuilder {
+
+               private final String command;
+               private final Path file;
+
+               private boolean inPlace = false;
+
+               SedBuilder(final String command, final Path file) {
+                       this.command = command;
+                       this.file = file;
+               }
+
+               public SedBuilder inPlace() {
+                       inPlace = true;
+                       return this;
+               }
+
+               public String[] build() {
+                       final List<String> commandsList = new ArrayList<>(5);
+                       commandsList.add("sed");
+                       if (inPlace) {
+                               commandsList.add("-i");
+                       }
+                       commandsList.add("-e");
+                       commandsList.add(command);
+                       commandsList.add(file.toAbsolutePath().toString());
+                       return commandsList.toArray(new 
String[commandsList.size()]);
+               }
+       }
+
+       public static TarBuilder tar(final Path file) {
+               return new TarBuilder(file);
+       }
+
+       /**
+        * Wrapper around tar used for extracting .tar archives.
+        */
+       public static final class TarBuilder {
 
 Review comment:
   Same as above.

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