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annotate src/org/tmatesoft/hg/internal/WorkingDirFileWriter.java @ 617:65c01508f002

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Rollback support for commands that modify repository. Strategy to keep complete copy of a file being changed
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 15 May 2013 20:10:09 +0200
parents bd5926e24aa3
children 6526d8adbc0f
rev   line source
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1 /*
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2 * Copyright (c) 2012-2013 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.FileOutputStream;
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23 import java.io.IOException;
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24 import java.nio.ByteBuffer;
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25 import java.nio.channels.FileChannel;
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26
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27 import org.tmatesoft.hg.repo.HgDataFile;
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28 import org.tmatesoft.hg.repo.HgManifest;
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29 import org.tmatesoft.hg.util.ByteChannel;
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30 import org.tmatesoft.hg.util.CancelledException;
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31 import org.tmatesoft.hg.util.LogFacility.Severity;
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32 import org.tmatesoft.hg.util.Path;
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33
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34 /**
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35 *
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36 * @author Artem Tikhomirov
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37 * @author TMate Software Ltd.
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38 */
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39 public class WorkingDirFileWriter implements ByteChannel {
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40
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41
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42 private final Internals hgRepo;
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43 private final boolean execCap, symlinkCap;
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44 private final FileSystemHelper fileFlagsHelper;
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45 private File dest;
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46 private FileChannel destChannel;
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47 private int totalBytesWritten;
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48 private ByteArrayChannel linkChannel;
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49 private int fmode;
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50
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51 public WorkingDirFileWriter(Internals internalRepo) {
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52 hgRepo = internalRepo;
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53 execCap = Internals.checkSupportsExecutables(internalRepo.getRepo().getWorkingDir());
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54 symlinkCap = Internals.checkSupportsSymlinks(internalRepo.getRepo().getWorkingDir());
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55 if (symlinkCap || execCap) {
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56 fileFlagsHelper = new FileSystemHelper(internalRepo.getSessionContext());
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57 } else {
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58 fileFlagsHelper = null;
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59 }
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60 }
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61
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62 /**
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63 * Writes content of specified file revision into local filesystem, or create a symlink according to flags.
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64 * Executable bit is set if specified and filesystem supports it.
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65 */
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66 public void processFile(HgDataFile df, int fileRevIndex, HgManifest.Flags flags) throws IOException {
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67 try {
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68 prepare(df.getPath());
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69 if (flags != HgManifest.Flags.Link) {
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70 destChannel = new FileOutputStream(dest).getChannel();
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71 } else {
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72 linkChannel = new ByteArrayChannel();
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73 }
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74 df.contentWithFilters(fileRevIndex, this);
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75 } catch (CancelledException ex) {
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76 hgRepo.getSessionContext().getLog().dump(getClass(), Severity.Error, ex, "Our impl doesn't throw cancellation");
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77 } finally {
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78 if (flags != HgManifest.Flags.Link) {
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79 destChannel.close();
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80 destChannel = null;
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81 // leave dest in case anyone enquires with #getDestinationFile
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82 }
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83 }
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84 if (linkChannel != null && symlinkCap) {
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85 assert flags == HgManifest.Flags.Link;
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86 fileFlagsHelper.createSymlink(dest.getParentFile(), dest.getName(), linkChannel.toArray());
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87 } else if (flags == HgManifest.Flags.Exec && execCap) {
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88 fileFlagsHelper.setExecutableBit(dest.getParentFile(), dest.getName());
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89 }
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90 // Although HgWCStatusCollector treats 644 (`hg manifest -v`) and 664 (my fs) the same, it's better
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91 // to detect actual flags here
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92 fmode = flags.fsMode(); // default to one from manifest
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93 if (fileFlagsHelper != null) {
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94 // if neither execBit nor link is supported by fs, it's unlikely file mode is supported, too.
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95 try {
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96 fmode = fileFlagsHelper.getFileMode(dest, fmode);
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97 } catch (IOException ex) {
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98 // Warn, we've got default value and can live with it
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99 hgRepo.getSessionContext().getLog().dump(getClass(), Warn, ex, "Failed get file access rights");
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100 }
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101 }
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102 }
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103
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104 public void prepare(Path fname) throws IOException {
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105 String fpath = fname.toString();
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106 dest = new File(hgRepo.getRepo().getWorkingDir(), fpath);
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107 if (fpath.indexOf('/') != -1) {
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108 dest.getParentFile().mkdirs();
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109 }
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110 destChannel = null;
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111 linkChannel = null;
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112 totalBytesWritten = 0;
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113 fmode = 0;
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114 }
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115
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116 public int write(ByteBuffer buffer) throws IOException, CancelledException {
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117 final int written;
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118 if (linkChannel != null) {
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119 written = linkChannel.write(buffer);
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120 } else {
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121 written = destChannel.write(buffer);
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122 }
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123 totalBytesWritten += written;
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124 return written;
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125 }
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126
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127 /**
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128 * Information purposes only, to find out trouble location if {@link #processFile(HgDataFile, int)} fails
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129 */
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130 public File getDestinationFile() {
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131 return dest;
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132 }
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133
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134 public int bytesWritten() {
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135 return totalBytesWritten;
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136 }
580
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137
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138 public int fmode() {
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139 return fmode;
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140 }
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141
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142 public int mtime() {
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143 return (int) (dest.lastModified() / 1000);
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144 }
525
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145 }