Add "version" tool.

From: Aaron Kimball <aaron@cloudera.com>

git-svn-id: https://svn.apache.org/repos/asf/incubator/sqoop/trunk@1149901 13f79535-47bb-0310-9956-ffa450edef68

build.xml

@@ -46,6 +46,7 @@
 
   <property name="build.dir" location="${basedir}/build" />
   <property name="build.bin.dir" location="${build.dir}/bin" />
+  <property name="build.src.dir" location="${build.dir}/src" />
   <property name="build.classes" location="${build.dir}/classes"/>
   <property name="build.shim.dir" location="${build.dir}/shims"/>
   <property name="build.shim.classes" location="${build.shim.dir}/classes"/>
@@ -183,15 +184,37 @@
       <param name="hadoop.dist" value="cloudera" />
     </antcall>
   </target>
+
+  <!-- generate the version information class. -->
+  <target name="gen-version" depends="init">
+    <exec executable="${script.src.dir}/write-version-info.sh"
+        dir="${basedir}" failonerror="true">
+      <arg value="${build.dir}" />
+      <arg value="${version}" />
+    </exec>
+  </target>
   
   <!-- Compile core classes for the project -->
   <target name="compile"
-      depends="init, ivy-retrieve-hadoop"
+      depends="init, gen-version, ivy-retrieve-hadoop"
       description="Compile core classes for the project">
     <!-- don't use an out-of-date instrumented build. -->
     <delete dir="${cobertura.class.dir}" />
     <!-- ensure normal build target dir exists -->
     <mkdir dir="${build.classes}" />
+
+    <!-- Compile generated code first. -->
+    <javac
+        encoding="${build.encoding}"
+        srcdir="${build.src.dir}"
+        includes="**/*.java"
+        destdir="${build.classes}"
+        debug="${javac.debug}"
+        deprecation="${javac.deprecation}">
+      <classpath refid="compile.classpath"/>
+    </javac>
+
+    <!-- Compile the main code. -->
     <javac
         encoding="${build.encoding}"
         srcdir="${src.dir}"

src/java/org/apache/hadoop/sqoop/tool/SqoopTool.java

@@ -73,6 +73,8 @@ public abstract class SqoopTool {
         "List available databases on a server");
     registerTool("list-tables", ListTablesTool.class,
         "List available tables in a database");
+    registerTool("version", VersionTool.class,
+        "Display version information");
   }
 
   /**

src/java/org/apache/hadoop/sqoop/tool/VersionTool.java

@@ -0,0 +1,46 @@
+/**
+ * Licensed to Cloudera, Inc. under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  Cloudera, Inc. 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.hadoop.sqoop.tool;
+
+import org.apache.hadoop.sqoop.SqoopOptions;
+import org.apache.hadoop.sqoop.SqoopVersion;
+import org.apache.hadoop.sqoop.cli.ToolOptions;
+
+/**
+ * Tool that prints Sqoop's version.
+ */
+public class VersionTool extends BaseSqoopTool {
+
+  public VersionTool() {
+    super("version");
+  }
+
+  @Override
+  /** {@inheritDoc} */
+  public int run(SqoopOptions options) {
+    System.out.print(new SqoopVersion().toString());
+    return 0;
+  }
+
+  @Override
+  public void printHelp(ToolOptions opts) {
+    System.out.println("usage: sqoop " + getToolName());
+  }
+}
+

src/scripts/write-version-info.sh

@@ -0,0 +1,57 @@
+#!/bin/sh
+#
+# Licensed to Cloudera, Inc. under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# Cloudera, Inc. 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.
+
+# This script writes the current version information to a generated source
+# file. It is intended to be run from the base directory of the project.
+#
+# Arguments are:
+#    path to the root of the build directory
+#    the version number
+#
+# e.g., $ write-version-info.sh ./build/ 1.0.0
+
+buildroot=$1
+version=$2
+
+outputdir=${buildroot}/src/org/apache/hadoop/sqoop
+outputfile=${outputdir}/SqoopVersion.java
+
+signature=`git log -1 --pretty=format:%H`
+host=`hostname`
+compiledate=`date`
+
+mkdir -p ${outputdir}
+cat > ${outputfile} <<EOF
+// generated by src/scripts/write-version-info.sh
+package org.apache.hadoop.sqoop;
+public final class SqoopVersion {
+  public SqoopVersion() {
+  }
+  public static final String VERSION="${version}";
+  public static final String GIT_HASH="${signature}";
+  public static final String COMPILE_USER="${USER}";
+  public static final String COMPILE_HOST="${host}";
+  public static final String COMPILE_DATE="${compiledate}";
+  public String toString() {
+    return "Sqoop " + VERSION + "\n"
+        + "git commit id " + GIT_HASH + "\n"
+        + "Compiled by " + COMPILE_USER + "@" + COMPILE_HOST
+        + " on " + COMPILE_DATE + "\n";
+  }
+}
+EOF
+