1 files changed, 86 insertions, 0 deletions
diff --git a/server/sonar-process/src/main/java/org/sonar/process/MinimumViableSystem.java b/server/sonar-process/src/main/java/org/sonar/process/MinimumViableSystem.java
new file mode 100644
index 00000000000..2389fa5aa18
--- /dev/null
+++ b/server/sonar-process/src/main/java/org/sonar/process/MinimumViableSystem.java
@@ -0,0 +1,86 @@
+/*
+ * SonarQube, open source software quality management tool.
+ * Copyright (C) 2008-2014 SonarSource
+ * mailto:contact AT sonarsource DOT com
+ *
+ * SonarQube is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * SonarQube is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+package org.sonar.process;
+
+import org.apache.commons.io.FileUtils;
+import org.apache.commons.lang.StringUtils;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+
+public class MinimumViableSystem {
+
+  private final Map<String, String> requiredJavaOptions = new HashMap<String, String>();
+
+  public MinimumViableSystem setRequiredJavaOption(String propertyKey, String expectedValue) {
+    requiredJavaOptions.put(propertyKey, expectedValue);
+    return this;
+  }
+
+  /**
+   * Entry point for all checks
+   */
+  public void check() {
+    checkJavaVersion();
+    checkJavaOptions();
+    checkWritableTempDir();
+  }
+
+  /**
+   * Verify that temp directory is writable
+   */
+  private void checkWritableTempDir() {
+    checkWritableDir(System.getProperty("java.io.tmpdir"));
+  }
+
+  void checkWritableDir(String tempPath) {
+    try {
+      File tempFile = File.createTempFile("check", "tmp", new File(tempPath));
+      FileUtils.deleteQuietly(tempFile);
+    } catch (IOException e) {
+      throw new IllegalStateException(String.format("Temp directory is not writable: %s", tempPath), e);
+    }
+  }
+
+  void checkJavaOptions() {
+    for (Map.Entry<String, String> entry : requiredJavaOptions.entrySet()) {
+      String value = System.getProperty(entry.getKey());
+      if (!StringUtils.equals(value, entry.getValue())) {
+        throw new MessageException(String.format(
+          "JVM option '%s' must be set to '%s'. Got '%s'", entry.getKey(), entry.getValue(), StringUtils.defaultString(value)));
+      }
+    }
+  }
+
+  void checkJavaVersion() {
+    String javaVersion = System.getProperty("java.specification.version");
+    checkJavaVersion(javaVersion);
+  }
+
+  void checkJavaVersion(String javaVersion) {
+    if (!javaVersion.startsWith("1.6") && !javaVersion.startsWith("1.7") && !javaVersion.startsWith("1.8")) {
+      // still better than "java.lang.UnsupportedClassVersionError: Unsupported major.minor version 49.0
+      throw new MessageException(String.format("Supported versions of Java are 1.6, 1.7 and 1.8. Got %s.", javaVersion));
+    }
+  }
+
+}