Convert Version to Java - clusterformation part1

buildSrc/src/main/java/org/elasticsearch/gradle/LoggedExec.java

@@ -0,0 +1,44 @@
+package org.elasticsearch.gradle;
+
+import org.gradle.api.GradleException;
+import org.gradle.api.tasks.Exec;
+
+import java.io.ByteArrayOutputStream;
+import java.io.UnsupportedEncodingException;
+
+/**
+ * A wrapper around gradle's Exec task to capture output and log on error.
+ */
+@SuppressWarnings("unchecked")
+public class LoggedExec extends Exec {
+
+    protected ByteArrayOutputStream output = new ByteArrayOutputStream();
+
+    public LoggedExec() {
+        if (getLogger().isInfoEnabled() == false) {
+            setStandardOutput(output);
+            setErrorOutput(output);
+            setIgnoreExitValue(true);
+            doLast((unused) -> {
+                    if (getExecResult().getExitValue() != 0) {
+                        try {
+                            for (String line : output.toString("UTF-8").split("\\R")) {
+                                getLogger().error(line);
+                            }
+                        } catch (UnsupportedEncodingException e) {
+                            throw new GradleException("Failed to read exec output", e);
+                        }
+                        throw new GradleException(
+                            String.format(
+                                "Process '%s %s' finished with non-zero exit value %d",
+                                getExecutable(),
+                                getArgs(),
+                                getExecResult().getExitValue()
+                            )
+                        );
+                    }
+                }
+            );
+        }
+    }
+}