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annotate src/org/tmatesoft/hg/internal/FileSystemHelper.java @ 606:5daa42067e7c

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Avoid mmap files when only few bytes are to be read
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 07 May 2013 14:16:35 +0200
parents bd5926e24aa3
children 4e6179bde4fc
rev   line source
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1 /*
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2 * Copyright (c) 2013 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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18
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19 import static org.tmatesoft.hg.util.LogFacility.Severity.Warn;
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20
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21 import java.io.File;
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22 import java.io.IOException;
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23 import java.nio.ByteBuffer;
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24 import java.util.ArrayList;
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25 import java.util.Arrays;
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26 import java.util.Collections;
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27 import java.util.List;
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28
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29 import org.tmatesoft.hg.core.SessionContext;
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30
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31 /**
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32 * TODO Merge with RegularFileStats
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33 *
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34 * @author Artem Tikhomirov
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35 * @author TMate Software Ltd.
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36 */
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37 public class FileSystemHelper {
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38
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39 private final SessionContext ctx;
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40 private final List<String> linkCmd, chmodCmd, statCmd;
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41 private final ProcessExecHelper execHelper;
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42
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43 public FileSystemHelper(SessionContext sessionContext) {
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44 ctx = sessionContext;
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45 if (Internals.runningOnWindows()) {
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46 linkCmd = Arrays.asList("mklink", "%1", "%2");
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47 chmodCmd = Collections.emptyList();
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48 statCmd = Collections.emptyList();
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49 } else {
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50 linkCmd = Arrays.asList("/bin/ln", "-s", "%2", "%1");
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51 chmodCmd = Arrays.asList("/bin/chmod", "+x", "%1");
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52 statCmd = Arrays.asList("stat", "--format=%a", "%1");
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53 }
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54 execHelper = new ProcessExecHelper();
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55 }
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56
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57 public void createSymlink(File parentDir, String linkName, byte[] target) throws IOException {
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58 ArrayList<String> command = new ArrayList<String>(linkCmd);
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59 command.set(command.indexOf("%1"), linkName);
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60 String targetFilename = Internals.getFileEncoding(ctx).decode(ByteBuffer.wrap(target)).toString();
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61 command.set(command.indexOf("%2"), targetFilename);
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62 execHelper.cwd(parentDir);
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63 try {
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64 execHelper.exec(command);
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65 } catch (InterruptedException ex) {
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66 throw new IOException(ex);
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67 }
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68 }
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69
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70 public void setExecutableBit(File parentDir, String fname) throws IOException {
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71 if (chmodCmd.isEmpty()) {
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72 return;
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73 }
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74 ArrayList<String> command = new ArrayList<String>(chmodCmd);
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75 command.set(command.indexOf("%1"), fname);
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76 execHelper.cwd(parentDir);
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77 try {
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78 execHelper.exec(command);
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79 } catch (InterruptedException ex) {
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80 throw new IOException(ex);
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81 }
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82 }
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83
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84 public int getFileMode(File file, int defaultValue) throws IOException {
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85 if (statCmd.isEmpty()) {
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86 return defaultValue;
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87 }
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88 ArrayList<String> command = new ArrayList<String>(statCmd);
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89 command.set(command.indexOf("%1"), file.getAbsolutePath());
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90 String result = null;
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91 try {
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92 result = execHelper.exec(command).toString().trim();
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93 if (result.isEmpty()) {
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94 return defaultValue;
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95 }
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96 return Integer.parseInt(result, 8);
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97 } catch (InterruptedException ex) {
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98 throw new IOException(ex);
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99 } catch (NumberFormatException ex) {
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100 ctx.getLog().dump(getClass(), Warn, ex, String.format("Bad value for access rights:%s", result));
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101 return defaultValue;
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102 }
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103 }
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104 }