Mercurial > hg4j

annotate src/org/tmatesoft/hg/core/HgCloneCommand.java @ 467:51d682cf9cdc

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Cleaned experimental tag and updated comments/javadoc
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 22 Jun 2012 17:39:31 +0200
parents 12f668401613
children b3c16d1aede0
rev   line source
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1 /*
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2 * Copyright (c) 2011-2012 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.core;
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19 import static org.tmatesoft.hg.core.Nodeid.NULL;
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20 import static org.tmatesoft.hg.internal.RequiresFile.*;
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22 import java.io.ByteArrayOutputStream;
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23 import java.io.File;
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24 import java.io.FileOutputStream;
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25 import java.io.IOException;
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26 import java.nio.ByteBuffer;
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27 import java.util.ArrayList;
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28 import java.util.Collections;
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29 import java.util.LinkedList;
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30 import java.util.TreeMap;
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31 import java.util.zip.DeflaterOutputStream;
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32
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33 import org.tmatesoft.hg.internal.BasicSessionContext;
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34 import org.tmatesoft.hg.internal.ByteArrayDataAccess;
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35 import org.tmatesoft.hg.internal.DataAccess;
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36 import org.tmatesoft.hg.internal.DigestHelper;
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37 import org.tmatesoft.hg.internal.Internals;
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38 import org.tmatesoft.hg.repo.HgBundle;
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39 import org.tmatesoft.hg.repo.HgBundle.GroupElement;
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40 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
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41 import org.tmatesoft.hg.repo.HgInvalidFileException;
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42 import org.tmatesoft.hg.repo.HgInvalidStateException;
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43 import org.tmatesoft.hg.repo.HgLookup;
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44 import org.tmatesoft.hg.repo.HgRemoteRepository;
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45 import org.tmatesoft.hg.repo.HgRepository;
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46 import org.tmatesoft.hg.repo.HgRuntimeException;
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47 import org.tmatesoft.hg.util.CancelledException;
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48 import org.tmatesoft.hg.util.PathRewrite;
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49
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50 /**
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51 * WORK IN PROGRESS, DO NOT USE
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52 *
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53 * @author Artem Tikhomirov
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54 * @author TMate Software Ltd.
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55 */
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56 public class HgCloneCommand extends HgAbstractCommand<HgCloneCommand> {
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58 private File destination;
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59 private HgRemoteRepository srcRepo;
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60
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61 public HgCloneCommand() {
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62 }
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63
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64 /**
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65 * @param folder location to become root of the repository (i.e. where <em>.hg</em> folder would reside). Either
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66 * shall not exist or be empty otherwise.
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67 * @return <code>this</code> for convenience
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68 */
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69 public HgCloneCommand destination(File folder) {
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70 destination = folder;
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71 return this;
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72 }
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74 public HgCloneCommand source(HgRemoteRepository hgRemote) {
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75 srcRepo = hgRemote;
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76 return this;
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77 }
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78
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79 /**
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80 *
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81 * @return
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82 * @throws HgBadArgumentException
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83 * @throws HgRemoteConnectionException
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84 * @throws HgRepositoryNotFoundException
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85 * @throws HgException
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86 * @throws CancelledException
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87 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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88 */
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89 public HgRepository execute() throws HgException, CancelledException {
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90 if (destination == null) {
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91 throw new IllegalArgumentException("Destination not set", null);
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92 }
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93 if (srcRepo == null || srcRepo.isInvalid()) {
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94 throw new HgBadArgumentException("Bad source repository", null);
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95 }
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96 if (destination.exists()) {
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97 if (!destination.isDirectory()) {
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98 throw new HgBadArgumentException(String.format("%s is not a directory", destination), null);
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99 } else if (destination.list().length > 0) {
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100 throw new HgBadArgumentException(String.format("% shall be empty", destination), null);
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101 }
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102 } else {
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103 destination.mkdirs();
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104 }
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105 // if cloning remote repo, which can stream and no revision is specified -
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106 // can use 'stream_out' wireproto
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107 //
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108 // pull all changes from the very beginning
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109 // XXX consult getContext() if by any chance has a bundle ready, if not, then read and register
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110 HgBundle completeChanges = srcRepo.getChanges(Collections.singletonList(NULL));
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111 WriteDownMate mate = new WriteDownMate(destination);
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112 try {
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113 // instantiate new repo in the destdir
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114 mate.initEmptyRepository();
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115 // pull changes
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116 completeChanges.inspectAll(mate);
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117 mate.complete();
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118 } catch (IOException ex) {
295
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119 throw new HgInvalidFileException(getClass().getName(), ex);
186
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120 } finally {
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121 completeChanges.unlink();
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122 }
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123 return new HgLookup().detect(destination);
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124 }
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125
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126
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127 // 1. process changelog, memorize nodeids to index
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128 // 2. process manifest, using map from step 3, collect manifest nodeids
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129 // 3. process every file, using map from 3, and consult set from step 4 to ensure repo is correct
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130 private static class WriteDownMate implements HgBundle.Inspector {
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131 private final File hgDir;
190
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132 private final PathRewrite storagePathHelper;
186
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133 private FileOutputStream indexFile;
190
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134 private String filename; // human-readable name of the file being written, for log/exception purposes
186
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135
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136 private final TreeMap<Nodeid, Integer> changelogIndexes = new TreeMap<Nodeid, Integer>();
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137 private boolean collectChangelogIndexes = false;
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138
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139 private int base = -1;
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140 private long offset = 0;
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141 private DataAccess prevRevContent;
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142 private final DigestHelper dh = new DigestHelper();
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143 private final ArrayList<Nodeid> revisionSequence = new ArrayList<Nodeid>(); // last visited nodes first
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144
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145 private final LinkedList<String> fncacheFiles = new LinkedList<String>();
202
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146 private Internals implHelper;
186
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147
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148 public WriteDownMate(File destDir) {
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149 hgDir = new File(destDir, ".hg");
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150 implHelper = new Internals(new BasicSessionContext(null));
202
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151 implHelper.setStorageConfig(1, STORE | FNCACHE | DOTENCODE);
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152 storagePathHelper = implHelper.buildDataFilesHelper();
186
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153 }
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154
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155 public void initEmptyRepository() throws IOException {
202
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156 implHelper.initEmptyRepository(hgDir);
186
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157 }
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158
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159 public void complete() throws IOException {
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160 FileOutputStream fncacheFile = new FileOutputStream(new File(hgDir, "store/fncache"));
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161 for (String s : fncacheFiles) {
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162 fncacheFile.write(s.getBytes());
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163 fncacheFile.write(0x0A); // http://mercurial.selenic.com/wiki/fncacheRepoFormat
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164 }
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165 fncacheFile.close();
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166 }
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167
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168 public void changelogStart() {
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169 try {
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170 base = -1;
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171 offset = 0;
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172 revisionSequence.clear();
190
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173 indexFile = new FileOutputStream(new File(hgDir, filename = "store/00changelog.i"));
186
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174 collectChangelogIndexes = true;
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175 } catch (IOException ex) {
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176 throw new HgInvalidControlFileException("Failed to write changelog", ex, new File(filename));
186
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177 }
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178 }
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179
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180 public void changelogEnd() {
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181 try {
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182 if (prevRevContent != null) {
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183 prevRevContent.done();
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184 prevRevContent = null;
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185 }
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186 collectChangelogIndexes = false;
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187 indexFile.close();
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188 indexFile = null;
190
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189 filename = null;
186
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190 } catch (IOException ex) {
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191 throw new HgInvalidControlFileException("Failed to write changelog", ex, new File(filename));
186
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192 }
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193 }
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194
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195 public void manifestStart() {
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196 try {
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197 base = -1;
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198 offset = 0;
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199 revisionSequence.clear();
190
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200 indexFile = new FileOutputStream(new File(hgDir, filename = "store/00manifest.i"));
186
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201 } catch (IOException ex) {
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202 throw new HgInvalidControlFileException("Failed to write manifest", ex, new File(filename));
186
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203 }
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204 }
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205
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206 public void manifestEnd() {
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207 try {
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208 if (prevRevContent != null) {
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209 prevRevContent.done();
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210 prevRevContent = null;
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211 }
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212 indexFile.close();
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213 indexFile = null;
190
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214 filename = null;
186
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215 } catch (IOException ex) {
423
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216 throw new HgInvalidControlFileException("Failed to write changelog", ex, new File(filename));
186
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217 }
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218 }
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219
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220 public void fileStart(String name) {
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221 try {
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222 base = -1;
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223 offset = 0;
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224 revisionSequence.clear();
418
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225 fncacheFiles.add("data/" + name + ".i"); // TODO post-1.0 this is pure guess,
186
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226 // need to investigate more how filenames are kept in fncache
292
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227 File file = new File(hgDir, filename = storagePathHelper.rewrite(name).toString());
186
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228 file.getParentFile().mkdirs();
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229 indexFile = new FileOutputStream(file);
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230 } catch (IOException ex) {
423
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231 String m = String.format("Failed to write file %s", filename);
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232 throw new HgInvalidControlFileException(m, ex, new File(filename));
186
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233 }
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234 }
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235
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236 public void fileEnd(String name) {
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237 try {
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238 if (prevRevContent != null) {
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239 prevRevContent.done();
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240 prevRevContent = null;
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241 }
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242 indexFile.close();
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243 indexFile = null;
190
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244 filename = null;
186
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245 } catch (IOException ex) {
423
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246 String m = String.format("Failed to write file %s", filename);
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247 throw new HgInvalidControlFileException(m, ex, new File(filename));
186
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248 }
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249 }
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250
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251 private int knownRevision(Nodeid p) {
274
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252 if (p.isNull()) {
186
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253 return -1;
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254 } else {
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255 for (int i = revisionSequence.size() - 1; i >= 0; i--) {
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256 if (revisionSequence.get(i).equals(p)) {
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257 return i;
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258 }
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259 }
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260 }
423
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261 String m = String.format("Can't find index of %s for file %s", p.shortNotation(), filename);
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262 throw new HgInvalidControlFileException(m, null, null).setRevision(p);
186
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263 }
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264
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265 public boolean element(GroupElement ge) {
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266 try {
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267 assert indexFile != null;
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268 boolean writeComplete = false;
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269 Nodeid p1 = ge.firstParent();
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270 Nodeid p2 = ge.secondParent();
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271 if (p1.isNull() && p2.isNull() /* or forced flag, does REVIDX_PUNCHED_FLAG indicate that? */) {
186
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272 prevRevContent = new ByteArrayDataAccess(new byte[0]);
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273 writeComplete = true;
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274 }
358
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275 byte[] content = ge.apply(prevRevContent.byteArray());
186
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276 byte[] calculated = dh.sha1(p1, p2, content).asBinary();
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277 final Nodeid node = ge.node();
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278 if (!node.equalsTo(calculated)) {
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279 // TODO post-1.0 custom exception ChecksumCalculationFailed?
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280 throw new HgInvalidStateException(String.format("Checksum failed: expected %s, calculated %s. File %s", node, calculated, filename));
186
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281 }
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282 final int link;
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283 if (collectChangelogIndexes) {
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284 changelogIndexes.put(node, revisionSequence.size());
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285 link = revisionSequence.size();
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286 } else {
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287 Integer csRev = changelogIndexes.get(ge.cset());
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288 if (csRev == null) {
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289 throw new HgInvalidStateException(String.format("Changelog doesn't contain revision %s of %s", ge.cset().shortNotation(), filename));
186
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290 }
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291 link = csRev.intValue();
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292 }
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293 final int p1Rev = knownRevision(p1), p2Rev = knownRevision(p2);
358
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294 byte[] patchContent = ge.rawDataByteArray();
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295 writeComplete = writeComplete || patchContent.length >= (/* 3/4 of actual */content.length - (content.length >>> 2));
186
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296 if (writeComplete) {
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297 base = revisionSequence.size();
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298 }
358
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299 final byte[] sourceData = writeComplete ? content : patchContent;
186
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300 final byte[] data;
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301 ByteArrayOutputStream bos = new ByteArrayOutputStream(content.length);
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302 DeflaterOutputStream dos = new DeflaterOutputStream(bos);
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303 dos.write(sourceData);
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304 dos.close();
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305 final byte[] compressedData = bos.toByteArray();
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306 dos = null;
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307 bos = null;
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308 final Byte dataPrefix;
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309 if (compressedData.length >= (sourceData.length - (sourceData.length >>> 2))) {
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310 // compression wasn't too effective,
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311 data = sourceData;
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312 dataPrefix = 'u';
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313 } else {
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314 data = compressedData;
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315 dataPrefix = null;
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316 }
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317
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318 ByteBuffer header = ByteBuffer.allocate(64 /* REVLOGV1_RECORD_SIZE */);
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319 if (offset == 0) {
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320 final int INLINEDATA = 1 << 16;
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321 header.putInt(1 /* RevlogNG */ | INLINEDATA);
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322 header.putInt(0);
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323 } else {
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324 header.putLong(offset << 16);
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325 }
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326 final int compressedLen = data.length + (dataPrefix == null ? 0 : 1);
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327 header.putInt(compressedLen);
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328 header.putInt(content.length);
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329 header.putInt(base);
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330 header.putInt(link);
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331 header.putInt(p1Rev);
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332 header.putInt(p2Rev);
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333 header.put(node.toByteArray());
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334 // assume 12 bytes left are zeros
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335 indexFile.write(header.array());
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336 if (dataPrefix != null) {
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337 indexFile.write(dataPrefix.byteValue());
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338 }
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339 indexFile.write(data);
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340 //
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341 offset += compressedLen;
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342 revisionSequence.add(node);
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343 prevRevContent.done();
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344 prevRevContent = new ByteArrayDataAccess(content);
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345 } catch (IOException ex) {
423
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346 String m = String.format("Failed to write revision %s of file %s", ge.node().shortNotation(), filename);
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347 throw new HgInvalidControlFileException(m, ex, new File(filename));
186
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348 }
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349 return true;
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350 }
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351 }
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352
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353 }