HADOOP-7236. Refactor the mkdir command to conform to new FsCommand class. Contributed by Daryn Sharp
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1099612 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
parent
78a7b9768d
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369a203915
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@ -108,6 +108,9 @@ Trunk (unreleased changes)
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HADOOP-7227. Remove protocol version check at proxy creation in Hadoop
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RPC. (jitendra)
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HADOOP-7236. Refactor the mkdir command to conform to new FsCommand class.
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(Daryn Sharp via szetszwo)
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OPTIMIZATIONS
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BUG FIXES
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@ -735,30 +735,6 @@ public class FsShell extends Configured implements Tool {
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}
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}
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/**
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* Create the given dir
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*/
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void mkdir(String src) throws IOException {
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Path f = new Path(src);
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FileSystem srcFs = f.getFileSystem(getConf());
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FileStatus fstatus = null;
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try {
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fstatus = srcFs.getFileStatus(f);
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if (fstatus.isDirectory()) {
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throw new IOException("cannot create directory "
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+ src + ": File exists");
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}
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else {
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throw new IOException(src + " exists but " +
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"is not a directory");
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}
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} catch(FileNotFoundException e) {
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if (!srcFs.mkdirs(f)) {
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throw new IOException("failed to create " + src);
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}
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}
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}
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/**
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* (Re)create zero-length file at the specified path.
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* This will be replaced by a more UNIX-like touch when files may be
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@ -1274,7 +1250,7 @@ public class FsShell extends Configured implements Tool {
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GET_SHORT_USAGE + "\n\t" +
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"[-getmerge <src> <localdst> [addnl]] [-cat <src>]\n\t" +
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"[" + COPYTOLOCAL_SHORT_USAGE + "] [-moveToLocal <src> <localdst>]\n\t" +
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"[-mkdir <path>] [-report] [" + SETREP_SHORT_USAGE + "]\n\t" +
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"[-report] [" + SETREP_SHORT_USAGE + "]\n\t" +
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"[-touchz <path>] [-test -[ezd] <path>] [-stat [format] <path>]\n\t" +
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"[-text <path>]\n\t" +
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"[" + FsShellPermissions.CHMOD_USAGE + "]\n\t" +
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@ -1364,8 +1340,6 @@ public class FsShell extends Configured implements Tool {
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String moveToLocal = "-moveToLocal <src> <localdst>: Not implemented yet \n";
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String mkdir = "-mkdir <path>: \tCreate a directory in specified location. \n";
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String setrep = SETREP_SHORT_USAGE
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+ ": Set the replication level of a file. \n"
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+ "\t\tThe -R flag requests a recursive change of replication level \n"
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@ -1440,8 +1414,6 @@ public class FsShell extends Configured implements Tool {
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System.out.println(expunge);
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} else if ("rmr".equals(cmd)) {
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System.out.println(rmr);
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} else if ("mkdir".equals(cmd)) {
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System.out.println(mkdir);
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} else if ("mv".equals(cmd)) {
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System.out.println(mv);
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} else if ("cp".equals(cmd)) {
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@ -1506,7 +1478,6 @@ public class FsShell extends Configured implements Tool {
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System.out.println(cat);
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System.out.println(copyToLocal);
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System.out.println(moveToLocal);
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System.out.println(mkdir);
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System.out.println(setrep);
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System.out.println(touchz);
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System.out.println(test);
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@ -1566,8 +1537,6 @@ public class FsShell extends Configured implements Tool {
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//
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if ("-cat".equals(cmd)) {
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cat(argv[i], true);
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} else if ("-mkdir".equals(cmd)) {
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mkdir(argv[i]);
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} else if ("-rm".equals(cmd)) {
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delete(argv[i], false, rmSkipTrash);
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} else if ("-rmr".equals(cmd)) {
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@ -1632,7 +1601,7 @@ public class FsShell extends Configured implements Tool {
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System.err.println("Usage: java FsShell" +
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" [-D <[property=value>]");
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} else if ("-du".equals(cmd) || "-dus".equals(cmd) ||
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"-touchz".equals(cmd) || "-mkdir".equals(cmd) ||
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"-touchz".equals(cmd) ||
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"-text".equals(cmd)) {
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System.err.println("Usage: java FsShell" +
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" [" + cmd + " <path>]");
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@ -1686,7 +1655,6 @@ public class FsShell extends Configured implements Tool {
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System.err.println(" [-text <src>]");
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System.err.println(" [" + COPYTOLOCAL_SHORT_USAGE + "]");
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System.err.println(" [-moveToLocal [-crc] <src> <localdst>]");
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System.err.println(" [-mkdir <path>]");
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System.err.println(" [" + SETREP_SHORT_USAGE + "]");
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System.err.println(" [-touchz <path>]");
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System.err.println(" [-test -[ezd] <path>]");
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@ -1743,7 +1711,7 @@ public class FsShell extends Configured implements Tool {
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return exitCode;
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}
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} else if ("-rm".equals(cmd) || "-rmr".equals(cmd) ||
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"-cat".equals(cmd) || "-mkdir".equals(cmd) ||
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"-cat".equals(cmd) ||
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"-touchz".equals(cmd) || "-stat".equals(cmd) ||
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"-text".equals(cmd)) {
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if (argv.length < 2) {
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@ -1829,8 +1797,6 @@ public class FsShell extends Configured implements Tool {
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du(argv, i);
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} else if ("-dus".equals(cmd)) {
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dus(argv, i);
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} else if ("-mkdir".equals(cmd)) {
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exitCode = doall(cmd, argv, i);
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} else if ("-touchz".equals(cmd)) {
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exitCode = doall(cmd, argv, i);
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} else if ("-test".equals(cmd)) {
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@ -31,8 +31,6 @@ import org.apache.hadoop.classification.InterfaceAudience;
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import org.apache.hadoop.classification.InterfaceStability;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.conf.Configured;
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import org.apache.hadoop.fs.FileStatus;
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import org.apache.hadoop.fs.FileSystem;
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import org.apache.hadoop.fs.Path;
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import org.apache.hadoop.util.StringUtils;
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@ -104,8 +102,8 @@ abstract public class Command extends Configured {
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int exitCode = 0;
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for (String src : args) {
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try {
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List<PathData> srcs = expandGlob(src);
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for(PathData s : srcs) {
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PathData[] srcs = PathData.expandAsGlob(src, getConf());
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for (PathData s : srcs) {
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run(s.path);
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}
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} catch (IOException e) {
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@ -128,7 +126,7 @@ abstract public class Command extends Configured {
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* \-> {@link #processPathArgument(PathData)}
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* \-> {@link #processPaths(PathData, PathData...)}
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* \-> {@link #processPath(PathData)}*
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* \-> {@link #processNonexistentPathArgument(PathData)}
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* \-> {@link #processNonexistentPath(PathData)}
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* </pre>
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* Most commands will chose to implement just
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* {@link #processOptions(LinkedList)} and {@link #processPath(PathData)}
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@ -191,7 +189,12 @@ abstract public class Command extends Configured {
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* @throws IOException if anything goes wrong...
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*/
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protected List<PathData> expandArgument(String arg) throws IOException {
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return expandGlob(arg);
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PathData[] items = PathData.expandAsGlob(arg, getConf());
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if (items.length == 0) {
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// it's a glob that failed to match
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throw new FileNotFoundException(getFnfText(new Path(arg)));
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}
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return Arrays.asList(items);
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}
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/**
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@ -216,7 +219,7 @@ abstract public class Command extends Configured {
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/**
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* Processes a {@link PathData} item, calling
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* {@link #processPathArgument(PathData)} or
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* {@link #processNonexistentPathArgument(PathData)} on each item.
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* {@link #processNonexistentPath(PathData)} on each item.
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* @param arg {@link PathData} item to process
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* @throws IOException if anything goes wrong...
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*/
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@ -224,7 +227,7 @@ abstract public class Command extends Configured {
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if (item.exists) {
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processPathArgument(item);
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} else {
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processNonexistentPathArgument(item);
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processNonexistentPath(item);
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}
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}
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@ -250,8 +253,7 @@ abstract public class Command extends Configured {
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* @throws FileNotFoundException if arg is a path and it doesn't exist
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* @throws IOException if anything else goes wrong...
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*/
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protected void processNonexistentPathArgument(PathData item)
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throws IOException {
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protected void processNonexistentPath(PathData item) throws IOException {
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// TODO: this should be more posix-like: ex. "No such file or directory"
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throw new FileNotFoundException(getFnfText(item.path));
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}
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@ -312,38 +314,6 @@ abstract public class Command extends Configured {
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protected void recursePath(PathData item) throws IOException {
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processPaths(item, item.getDirectoryContents());
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}
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/**
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* Expand the given path as a glob pattern. Non-existent paths do not
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* throw an exception because creation commands like touch and mkdir need
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* to create them. The "stat" field will be null if the path does not
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* exist.
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* @param pattern the glob to expand
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* @return list of {@link PathData} objects
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* @throws FileNotFoundException the path is a glob with no matches
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* @throws IOException anything else goes wrong...
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*/
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protected List<PathData> expandGlob(String pattern) throws IOException {
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Path path = new Path(pattern);
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FileSystem fs = path.getFileSystem(getConf());
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FileStatus[] stats = fs.globStatus(path);
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if (stats != null && stats.length == 0) { // glob failed to match
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// TODO: this should be more posix-like: ex. "No such file or directory"
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throw new FileNotFoundException(getFnfText(path));
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}
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List<PathData> items = new LinkedList<PathData>();
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if (stats == null) { // not a glob & file not found, so null stat block
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items.add(new PathData(fs, path, null));
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} else {
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// convert all the stats to PathData objs
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for (FileStatus stat : stats) {
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items.add(new PathData(fs, stat));
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}
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}
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return items;
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}
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/**
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* Display an exception prefaced with the command name. Also increments
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public static void registerCommands(CommandFactory factory) {
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factory.registerCommands(Count.class);
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factory.registerCommands(Ls.class);
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factory.registerCommands(Mkdir.class);
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factory.registerCommands(Tail.class);
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}
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@ -0,0 +1,64 @@
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/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.hadoop.fs.shell;
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import java.io.IOException;
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import java.util.LinkedList;
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import org.apache.hadoop.classification.InterfaceAudience;
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import org.apache.hadoop.classification.InterfaceStability;
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/**
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* Create the given dir
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*/
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@InterfaceAudience.Private
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@InterfaceStability.Unstable
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class Mkdir extends FsCommand {
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public static void registerCommands(CommandFactory factory) {
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factory.addClass(Mkdir.class, "-mkdir");
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}
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public static final String NAME = "mkdir";
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public static final String USAGE = "<path> ...";
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public static final String DESCRIPTION =
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"Create a directory in specified location.";
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@Override
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protected void processOptions(LinkedList<String> args) {
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CommandFormat cf = new CommandFormat(null, 1, Integer.MAX_VALUE);
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cf.parse(args);
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}
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@Override
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protected void processPath(PathData item) throws IOException {
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if (item.stat.isDirectory()) {
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throw new IOException("cannot create directory " + item + ": File exists");
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} else {
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throw new IOException(item + " exists but is not a directory");
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}
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}
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@Override
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protected void processNonexistentPath(PathData item) throws IOException {
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if (!item.fs.mkdirs(item.path)) {
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throw new IOException("failed to create " + item);
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}
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}
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}
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@ -23,6 +23,7 @@ import java.io.IOException;
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import org.apache.hadoop.classification.InterfaceAudience;
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import org.apache.hadoop.classification.InterfaceStability;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.fs.FileStatus;
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import org.apache.hadoop.fs.FileSystem;
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import org.apache.hadoop.fs.Path;
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@ -35,22 +36,38 @@ import org.apache.hadoop.fs.Path;
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@InterfaceStability.Evolving
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public class PathData {
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protected String string = null;
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public final Path path;
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public FileStatus stat;
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public final FileSystem fs;
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public boolean exists;
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/**
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* Creates an object to wrap the given parameters as fields.
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* @param theFs the FileSystem
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* @param thePath a Path
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* @param theStat the FileStatus (may be null if the path doesn't exist)
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* Creates an object to wrap the given parameters as fields. The string
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* used to create the path will be recorded since the Path object does not
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* return exactly the same string used to initialize it
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* @param pathString a string for a path
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* @param conf the configuration file
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* @throws IOException if anything goes wrong...
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*/
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public PathData(FileSystem theFs, Path thePath, FileStatus theStat) {
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path = thePath;
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stat = theStat;
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fs = theFs;
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exists = (stat != null);
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public PathData(String pathString, Configuration conf) throws IOException {
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this.string = pathString;
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this.path = new Path(pathString);
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this.fs = path.getFileSystem(conf);
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setStat(getStat(fs, path));
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}
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/**
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* Creates an object to wrap the given parameters as fields.
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* @param fs the FileSystem
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* @param path a Path
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* @param stat the FileStatus (may be null if the path doesn't exist)
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*/
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public PathData(FileSystem fs, Path path, FileStatus stat) {
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this.string = path.toString();
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this.path = path;
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this.fs = fs;
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setStat(stat);
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}
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/**
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@ -64,6 +81,23 @@ public class PathData {
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this(fs, path, getStat(fs, path));
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}
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/**
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* Creates an object to wrap the given parameters as fields. The string
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* used to create the path will be recorded since the Path object does not
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* return exactly the same string used to initialize it. If the FileStatus
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* is not null, then its Path will be used to initialized the path, else
|
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* the string of the path will be used.
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* @param fs the FileSystem
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* @param pathString a String of the path
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* @param stat the FileStatus (may be null if the path doesn't exist)
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*/
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public PathData(FileSystem fs, String pathString, FileStatus stat) {
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this.string = pathString;
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this.path = (stat != null) ? stat.getPath() : new Path(pathString);
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this.fs = fs;
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setStat(stat);
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}
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// need a static method for the ctor above
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private static FileStatus getStat(FileSystem fs, Path path)
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throws IOException {
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@ -73,6 +107,11 @@ public class PathData {
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} catch (FileNotFoundException e) {} // ignore FNF
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return status;
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}
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private void setStat(FileStatus theStat) {
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stat = theStat;
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exists = (stat != null);
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}
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/**
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* Convenience ctor that extracts the path from the given file status
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|
@ -89,7 +128,7 @@ public class PathData {
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* @throws IOException if anything goes wrong...
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*/
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public FileStatus refreshStatus() throws IOException {
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stat = fs.getFileStatus(path);
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setStat(fs.getFileStatus(path));
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return stat;
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}
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|
@ -113,11 +152,56 @@ public class PathData {
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}
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/**
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* Returns the printable version of the path that is just the
|
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* filesystem path instead of the full uri
|
||||
* Expand the given path as a glob pattern. Non-existent paths do not
|
||||
* throw an exception because creation commands like touch and mkdir need
|
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* to create them. The "stat" field will be null if the path does not
|
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* exist.
|
||||
* @param pattern the pattern to expand as a glob
|
||||
* @param conf the hadoop configuration
|
||||
* @return list of {@link PathData} objects. if the pattern is not a glob,
|
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* and does not exist, the list will contain a single PathData with a null
|
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* stat
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||||
* @throws IOException anything else goes wrong...
|
||||
*/
|
||||
public static PathData[] expandAsGlob(String pattern, Configuration conf)
|
||||
throws IOException {
|
||||
Path globPath = new Path(pattern);
|
||||
FileSystem fs = globPath.getFileSystem(conf);
|
||||
FileStatus[] stats = fs.globStatus(globPath);
|
||||
PathData[] items = null;
|
||||
|
||||
if (stats == null) {
|
||||
// not a glob & file not found, so add the path with a null stat
|
||||
items = new PathData[]{ new PathData(fs, pattern, null) };
|
||||
} else if (
|
||||
// this is very ugly, but needed to avoid breaking hdfs tests...
|
||||
// if a path has no authority, then the FileStatus from globStatus
|
||||
// will add the "-fs" authority into the path, so we need to sub
|
||||
// it back out to satisfy the tests
|
||||
stats.length == 1
|
||||
&&
|
||||
stats[0].getPath().equals(fs.makeQualified(globPath)))
|
||||
{
|
||||
// if the fq path is identical to the pattern passed, use the pattern
|
||||
// to initialize the string value
|
||||
items = new PathData[]{ new PathData(fs, pattern, stats[0]) };
|
||||
} else {
|
||||
// convert stats to PathData
|
||||
items = new PathData[stats.length];
|
||||
int i=0;
|
||||
for (FileStatus stat : stats) {
|
||||
items[i++] = new PathData(fs, stat);
|
||||
}
|
||||
}
|
||||
return items;
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns the printable version of the path that is either the path
|
||||
* as given on the commandline, or the full path
|
||||
* @return String of the path
|
||||
*/
|
||||
public String toString() {
|
||||
return path.toString();
|
||||
return (string != null) ? string : path.toString();
|
||||
}
|
||||
}
|
||||
|
|
|
@ -25,7 +25,6 @@ import java.util.List;
|
|||
import org.apache.hadoop.classification.InterfaceAudience;
|
||||
import org.apache.hadoop.classification.InterfaceStability;
|
||||
import org.apache.hadoop.fs.FSDataInputStream;
|
||||
import org.apache.hadoop.fs.FileSystem;
|
||||
import org.apache.hadoop.fs.Path;
|
||||
import org.apache.hadoop.io.IOUtils;
|
||||
|
||||
|
@ -60,11 +59,8 @@ class Tail extends FsCommand {
|
|||
// TODO: HADOOP-7234 will add glob support; for now, be backwards compat
|
||||
@Override
|
||||
protected List<PathData> expandArgument(String arg) throws IOException {
|
||||
Path path = new Path(arg);
|
||||
FileSystem fs = path.getFileSystem(getConf());
|
||||
|
||||
List<PathData> items = new LinkedList<PathData>();
|
||||
items.add(new PathData(fs, path));
|
||||
items.add(new PathData(arg, getConf()));
|
||||
return items;
|
||||
}
|
||||
|
||||
|
|
|
@ -503,7 +503,7 @@
|
|||
<comparators>
|
||||
<comparator>
|
||||
<type>RegexpComparator</type>
|
||||
<expected-output>^-mkdir <path>:( |\t)*Create a directory in specified location.( )*</expected-output>
|
||||
<expected-output>^-mkdir <path> \.\.\.:( |\t)*Create a directory in specified location.( )*</expected-output>
|
||||
</comparator>
|
||||
</comparators>
|
||||
</test>
|
||||
|
|
|
@ -27,19 +27,48 @@ import static org.junit.Assert.*;
|
|||
public class TestPathData {
|
||||
protected static Configuration conf;
|
||||
protected static FileSystem fs;
|
||||
protected static String dirString;
|
||||
protected static Path dir;
|
||||
|
||||
protected static PathData item;
|
||||
|
||||
@BeforeClass
|
||||
public static void initialize() throws Exception {
|
||||
conf = new Configuration();
|
||||
fs = FileSystem.getLocal(conf);
|
||||
dir = new Path("/tmp");
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testWithPath() throws Exception {
|
||||
PathData item = new PathData(fs, dir);
|
||||
public void testWithFsAndPath() throws Exception {
|
||||
dirString = "/tmp";
|
||||
dir = new Path(dirString);
|
||||
item = new PathData(fs, dir);
|
||||
checkPathData();
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testWithStringAndConf() throws Exception {
|
||||
dirString = "/tmp";
|
||||
dir = new Path(dirString);
|
||||
item = new PathData(dirString, conf);
|
||||
checkPathData();
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testWithStringAndConfForBuggyPath() throws Exception {
|
||||
dirString = "file:///tmp";
|
||||
dir = new Path(dirString);
|
||||
item = new PathData(dirString, conf);
|
||||
// this may fail some day if Path is fixed to not crunch the uri
|
||||
// if the authority is null, however we need to test that the PathData
|
||||
// toString() returns the given string, while Path toString() does
|
||||
// the crunching
|
||||
assertEquals("file:/tmp", dir.toString());
|
||||
checkPathData();
|
||||
}
|
||||
|
||||
public void checkPathData() throws Exception {
|
||||
assertEquals(fs, item.fs);
|
||||
assertEquals(dirString, item.toString());
|
||||
assertEquals(dir, item.path);
|
||||
assertTrue(item.stat != null);
|
||||
assertTrue(item.stat.isDirectory());
|
||||
|
|
Loading…
Reference in New Issue