1 files changed, 77 insertions, 0 deletions
diff --git a/core/src/main/java/org/elasticsearch/cli/SettingCommand.java b/core/src/main/java/org/elasticsearch/cli/SettingCommand.java
new file mode 100644
index 0000000000..868975ac6f
--- /dev/null
+++ b/core/src/main/java/org/elasticsearch/cli/SettingCommand.java
@@ -0,0 +1,77 @@
+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch 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.elasticsearch.cli;
+
+import joptsimple.OptionSet;
+import joptsimple.OptionSpec;
+import joptsimple.util.KeyValuePair;
+
+import java.util.HashMap;
+import java.util.Locale;
+import java.util.Map;
+
+public abstract class SettingCommand extends Command {
+
+    private final OptionSpec<KeyValuePair> settingOption;
+
+    public SettingCommand(String description) {
+        super(description);
+        this.settingOption = parser.accepts("E", "Configure a setting").withRequiredArg().ofType(KeyValuePair.class);
+    }
+
+    @Override
+    protected void execute(Terminal terminal, OptionSet options) throws Exception {
+        final Map<String, String> settings = new HashMap<>();
+        for (final KeyValuePair kvp : settingOption.values(options)) {
+            if (kvp.value.isEmpty()) {
+                throw new UserError(ExitCodes.USAGE, "Setting [" + kvp.key + "] must not be empty");
+            }
+            settings.put(kvp.key, kvp.value);
+        }
+
+        putSystemPropertyIfSettingIsMissing(settings, "path.conf", "es.path.conf");
+        putSystemPropertyIfSettingIsMissing(settings, "path.data", "es.path.data");
+        putSystemPropertyIfSettingIsMissing(settings, "path.home", "es.path.home");
+        putSystemPropertyIfSettingIsMissing(settings, "path.logs", "es.path.logs");
+
+        execute(terminal, options, settings);
+    }
+
+    protected static void putSystemPropertyIfSettingIsMissing(final Map<String, String> settings, final String setting, final String key) {
+        final String value = System.getProperty(key);
+        if (value != null) {
+            if (settings.containsKey(setting)) {
+                final String message =
+                        String.format(
+                                Locale.ROOT,
+                                "duplicate setting [%s] found via command-line [%s] and system property [%s]",
+                                setting,
+                                settings.get(setting),
+                                value);
+                throw new IllegalArgumentException(message);
+            } else {
+                settings.put(setting, value);
+            }
+        }
+    }
+
+    protected abstract void execute(Terminal terminal, OptionSet options, Map<String, String> settings) throws Exception;
+
+}