Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/3916#discussion_r25297378
--- Diff:
launcher/src/main/java/org/apache/spark/launcher/CommandBuilderUtils.java ---
@@ -0,0 +1,228 @@
+/*
+ * 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.spark.launcher;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Helper methods for command builders.
+ */
+class CommandBuilderUtils {
+
+ static final String DEFAULT_MEM = "512m";
+ static final String DEFAULT_PROPERTIES_FILE = "spark-defaults.conf";
+ static final String ENV_SPARK_HOME = "SPARK_HOME";
+
+ /** Returns whether the given string is null or empty. */
+ static boolean isEmpty(String s) {
+ return s == null || s.isEmpty();
+ }
+
+ /** Joins a list of strings using the given separator. */
+ static String join(String sep, String... elements) {
+ StringBuilder sb = new StringBuilder();
+ for (String e : elements) {
+ if (e != null) {
+ if (sb.length() > 0) {
+ sb.append(sep);
+ }
+ sb.append(e);
+ }
+ }
+ return sb.toString();
+ }
+
+ /** Joins a list of strings using the given separator. */
+ static String join(String sep, Iterable<String> elements) {
+ StringBuilder sb = new StringBuilder();
+ for (String e : elements) {
+ if (e != null) {
+ if (sb.length() > 0) {
+ sb.append(sep);
+ }
+ sb.append(e);
+ }
+ }
+ return sb.toString();
+ }
+
+ /** Returns the first value mapped to the given key in the given maps. */
+ static String find(String key, Map<?, ?>... maps) {
+ for (Map<?, ?> map : maps) {
+ String value = (String) map.get(key);
+ if (!isEmpty(value)) {
+ return value;
+ }
+ }
+ return null;
+ }
+
+ /** Returns the first non-empty, non-null string in the given list. */
+ static String firstNonEmpty(String... candidates) {
+ for (String s : candidates) {
+ if (!isEmpty(s)) {
+ return s;
+ }
+ }
+ return null;
+ }
+
+ /** Returns the name of the env variable that holds the native library
path. */
+ static String getLibPathEnvName() {
+ if (isWindows()) {
+ return "PATH";
+ }
+
+ String os = System.getProperty("os.name");
+ if (os.startsWith("Mac OS X")) {
+ return "DYLD_LIBRARY_PATH";
+ } else {
+ return "LD_LIBRARY_PATH";
+ }
+ }
+
+ /** Returns whether the OS is Windows. */
+ static boolean isWindows() {
+ String os = System.getProperty("os.name");
+ return os.startsWith("Windows");
+ }
+
+ /**
+ * Updates the user environment to contain the merged value of "envKey"
after appending
+ * the given path list.
+ */
+ static void mergeEnvPathList(Map<String, String> userEnv, String envKey,
String pathList) {
+ if (!isEmpty(pathList)) {
+ String current = firstNonEmpty(userEnv.get(envKey),
System.getenv(envKey));
+ userEnv.put(envKey, join(File.pathSeparator, current, pathList));
+ }
+ }
+
+ /**
+ * Parse a string as if it were a list of arguments, in the way that a
shell would.
+ * This tries to follow the way bash parses strings. For example:
--- End diff --
this second sentence doesn't add any new information
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