forked from D-Net/dnet-hadoop
107 lines
3.6 KiB
Java
107 lines
3.6 KiB
Java
package eu.dnetlib.dhp.common;
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import java.lang.reflect.Method;
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import java.util.Arrays;
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import java.util.LinkedList;
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import org.apache.hadoop.conf.Configurable;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.fs.FileSystem;
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import org.apache.hadoop.fs.FsShell;
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import org.springframework.beans.BeanUtils;
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import org.springframework.util.ClassUtils;
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import org.springframework.util.ReflectionUtils;
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/**
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* Extracted from:
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* https://github.com/spring-projects/spring-hadoop/blob/master/spring-hadoop-core/src/main/java/org/springframework/data/hadoop/fs/FsShellPermissions.java
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*
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* Utility class for accessing Hadoop FsShellPermissions (which is not public)
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* without having to duplicate its code.
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* @author Costin Leau
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*
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*/
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public class FsShellPermissions {
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private static boolean IS_HADOOP_20X = ClassUtils.isPresent("org.apache.hadoop.fs.FsShellPermissions$Chmod",
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FsShellPermissions.class.getClassLoader());
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public enum Op {
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CHOWN("-chown"), CHMOD("-chmod"), CHGRP("-chgrp");
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private final String cmd;
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Op(String cmd) {
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this.cmd = cmd;
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}
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public String getCmd() {
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return cmd;
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}
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}
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// TODO: move this into Spring Core (but add JDK 1.5 compatibility first)
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@SafeVarargs
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static <T> T[] concatAll(T[] first, T[]... rest) {
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// can add some sanity checks
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int totalLength = first.length;
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for (T[] array : rest) {
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totalLength += array.length;
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}
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T[] result = Arrays.copyOf(first, totalLength);
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int offset = first.length;
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for (T[] array : rest) {
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System.arraycopy(array, 0, result, offset, array.length);
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offset += array.length;
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}
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return result;
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}
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public static void changePermissions(FileSystem fs, Configuration config,
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Op op, boolean recursive, String group, String uri) {
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changePermissions(fs, config, op, recursive, group, new String[] {uri});
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}
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public static void changePermissions(FileSystem fs, Configuration config,
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Op op, boolean recursive, String group, String... uris) {
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String[] argvs;
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if (recursive) {
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argvs = new String[1];
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argvs[0] = "-R";
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} else {
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argvs = new String[0];
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}
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argvs = concatAll(argvs, new String[] { group }, uris);
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// Hadoop 1.0.x
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if (!IS_HADOOP_20X) {
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Class<?> cls = ClassUtils.resolveClassName("org.apache.hadoop.fs.FsShellPermissions", config.getClass().getClassLoader());
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Object[] args = new Object[] { fs, op.getCmd(), argvs, 0, new FsShell(config) };
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Method m = ReflectionUtils.findMethod(cls, "changePermissions", FileSystem.class, String.class, String[].class, int.class, FsShell.class);
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ReflectionUtils.makeAccessible(m);
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ReflectionUtils.invokeMethod(m, null, args);
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}
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// Hadoop 2.x
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else {
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Class<?> cmd = ClassUtils.resolveClassName("org.apache.hadoop.fs.shell.Command", config.getClass().getClassLoader());
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Class<?> targetClz = ClassUtils.resolveClassName("org.apache.hadoop.fs.FsShellPermissions$Chmod", config.getClass().getClassLoader());
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Configurable target = (Configurable) BeanUtils.instantiate(targetClz);
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target.setConf(config);
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// run(String...) swallows the exceptions - re-implement it here
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//
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LinkedList<String> args = new LinkedList<String>(Arrays.asList(argvs));
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try {
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Method m = ReflectionUtils.findMethod(cmd, "processOptions", LinkedList.class);
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ReflectionUtils.makeAccessible(m);
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ReflectionUtils.invokeMethod(m, target, args);
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m = ReflectionUtils.findMethod(cmd, "processRawArguments", LinkedList.class);
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ReflectionUtils.makeAccessible(m);
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ReflectionUtils.invokeMethod(m, target, args);
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} catch (IllegalStateException ex){
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throw new RuntimeException("Cannot change permissions/ownership " + ex);
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}
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}
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}
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}
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