Mercurial > hg4j

annotate src/org/tmatesoft/hg/core/HgCloneCommand.java @ 242:ad6a046943be

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Improved reading of sparse revisions from a revlog
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 23 Jun 2011 15:19:07 +0200
parents 883f1efbcf27
children 9fb50c04f03c
rev   line source
186
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1 /*
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2 * Copyright (c) 2011 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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18
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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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21
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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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33 import org.tmatesoft.hg.internal.ByteArrayDataAccess;
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34 import org.tmatesoft.hg.internal.DataAccess;
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35 import org.tmatesoft.hg.internal.DigestHelper;
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36 import org.tmatesoft.hg.internal.Internals;
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37 import org.tmatesoft.hg.repo.HgBundle;
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38 import org.tmatesoft.hg.repo.HgBundle.GroupElement;
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39 import org.tmatesoft.hg.repo.HgLookup;
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40 import org.tmatesoft.hg.repo.HgRemoteRepository;
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41 import org.tmatesoft.hg.repo.HgRepository;
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42 import org.tmatesoft.hg.util.CancelledException;
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43 import org.tmatesoft.hg.util.PathRewrite;
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44
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45 /**
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46 * WORK IN PROGRESS, DO NOT USE
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47 *
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48 * @author Artem Tikhomirov
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49 * @author TMate Software Ltd.
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50 */
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51 public class HgCloneCommand {
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52
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53 private File destination;
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54 private HgRemoteRepository srcRepo;
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55
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56 public HgCloneCommand() {
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57 }
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58
204
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59 /**
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60 * @param folder location to become root of the repository (i.e. where <em>.hg</em> folder would reside). Either
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61 * shall not exist or be empty otherwise.
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62 * @return <code>this</code> for convenience
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63 */
186
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64 public HgCloneCommand destination(File folder) {
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65 destination = folder;
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66 return this;
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67 }
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68
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69 public HgCloneCommand source(HgRemoteRepository hgRemote) {
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70 srcRepo = hgRemote;
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71 return this;
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72 }
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73
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74 public HgRepository execute() throws HgException, CancelledException {
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75 if (destination == null) {
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76 throw new HgBadArgumentException("Destination not set", null);
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77 }
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78 if (srcRepo == null || srcRepo.isInvalid()) {
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79 throw new HgBadArgumentException("Bad source repository", null);
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80 }
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81 if (destination.exists()) {
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82 if (!destination.isDirectory()) {
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83 throw new HgBadArgumentException(String.format("%s is not a directory", destination), null);
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84 } else if (destination.list().length > 0) {
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85 throw new HgBadArgumentException(String.format("% shall be empty", destination), null);
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86 }
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87 } else {
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88 destination.mkdirs();
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89 }
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90 // if cloning remote repo, which can stream and no revision is specified -
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91 // can use 'stream_out' wireproto
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92 //
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93 // pull all changes from the very beginning
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94 // XXX consult getContext() if by any chance has a bundle ready, if not, then read and register
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95 HgBundle completeChanges = srcRepo.getChanges(Collections.singletonList(NULL));
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96 WriteDownMate mate = new WriteDownMate(destination);
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97 try {
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98 // instantiate new repo in the destdir
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99 mate.initEmptyRepository();
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100 // pull changes
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101 completeChanges.inspectAll(mate);
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102 mate.complete();
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103 } catch (IOException ex) {
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104 throw new HgException(ex);
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105 } finally {
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106 completeChanges.unlink();
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107 }
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108 return new HgLookup().detect(destination);
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109 }
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110
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111
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112 // 1. process changelog, memorize nodeids to index
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113 // 2. process manifest, using map from step 3, collect manifest nodeids
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114 // 3. process every file, using map from 3, and consult set from step 4 to ensure repo is correct
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115 private static class WriteDownMate implements HgBundle.Inspector {
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116 private final File hgDir;
190
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117 private final PathRewrite storagePathHelper;
186
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118 private FileOutputStream indexFile;
190
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119 private String filename; // human-readable name of the file being written, for log/exception purposes
186
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120
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121 private final TreeMap<Nodeid, Integer> changelogIndexes = new TreeMap<Nodeid, Integer>();
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122 private boolean collectChangelogIndexes = false;
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123
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124 private int base = -1;
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125 private long offset = 0;
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126 private DataAccess prevRevContent;
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127 private final DigestHelper dh = new DigestHelper();
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128 private final ArrayList<Nodeid> revisionSequence = new ArrayList<Nodeid>(); // last visited nodes first
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129
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130 private final LinkedList<String> fncacheFiles = new LinkedList<String>();
202
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131 private Internals implHelper;
186
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132
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133 public WriteDownMate(File destDir) {
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134 hgDir = new File(destDir, ".hg");
202
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135 implHelper = new Internals();
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136 implHelper.setStorageConfig(1, STORE | FNCACHE | DOTENCODE);
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137 storagePathHelper = implHelper.buildDataFilesHelper();
186
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138 }
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139
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140 public void initEmptyRepository() throws IOException {
202
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141 implHelper.initEmptyRepository(hgDir);
186
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142 }
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143
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144 public void complete() throws IOException {
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145 FileOutputStream fncacheFile = new FileOutputStream(new File(hgDir, "store/fncache"));
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146 for (String s : fncacheFiles) {
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147 fncacheFile.write(s.getBytes());
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148 fncacheFile.write(0x0A); // http://mercurial.selenic.com/wiki/fncacheRepoFormat
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149 }
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150 fncacheFile.close();
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151 }
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152
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153 public void changelogStart() {
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154 try {
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155 base = -1;
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156 offset = 0;
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157 revisionSequence.clear();
190
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158 indexFile = new FileOutputStream(new File(hgDir, filename = "store/00changelog.i"));
186
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159 collectChangelogIndexes = true;
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160 } catch (IOException ex) {
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161 throw new HgBadStateException(ex);
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162 }
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163 }
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164
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165 public void changelogEnd() {
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166 try {
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167 if (prevRevContent != null) {
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168 prevRevContent.done();
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169 prevRevContent = null;
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170 }
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171 collectChangelogIndexes = false;
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172 indexFile.close();
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173 indexFile = null;
190
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174 filename = null;
186
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175 } catch (IOException ex) {
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176 throw new HgBadStateException(ex);
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177 }
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178 }
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179
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180 public void manifestStart() {
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181 try {
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182 base = -1;
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183 offset = 0;
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184 revisionSequence.clear();
190
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185 indexFile = new FileOutputStream(new File(hgDir, filename = "store/00manifest.i"));
186
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186 } catch (IOException ex) {
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187 throw new HgBadStateException(ex);
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188 }
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189 }
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190
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191 public void manifestEnd() {
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192 try {
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193 if (prevRevContent != null) {
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194 prevRevContent.done();
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195 prevRevContent = null;
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196 }
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197 indexFile.close();
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198 indexFile = null;
190
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199 filename = null;
186
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200 } catch (IOException ex) {
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201 throw new HgBadStateException(ex);
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202 }
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203 }
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204
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205 public void fileStart(String name) {
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206 try {
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207 base = -1;
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208 offset = 0;
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209 revisionSequence.clear();
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210 fncacheFiles.add("data/" + name + ".i"); // FIXME this is pure guess,
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211 // need to investigate more how filenames are kept in fncache
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212 File file = new File(hgDir, filename = storagePathHelper.rewrite(name));
186
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213 file.getParentFile().mkdirs();
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214 indexFile = new FileOutputStream(file);
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215 } catch (IOException ex) {
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216 throw new HgBadStateException(ex);
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217 }
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218 }
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219
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220 public void fileEnd(String name) {
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221 try {
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222 if (prevRevContent != null) {
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223 prevRevContent.done();
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224 prevRevContent = null;
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225 }
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226 indexFile.close();
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227 indexFile = null;
190
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228 filename = null;
186
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229 } catch (IOException ex) {
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230 throw new HgBadStateException(ex);
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231 }
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232 }
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233
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234 private int knownRevision(Nodeid p) {
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235 if (NULL.equals(p)) {
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236 return -1;
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237 } else {
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238 for (int i = revisionSequence.size() - 1; i >= 0; i--) {
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239 if (revisionSequence.get(i).equals(p)) {
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240 return i;
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241 }
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242 }
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243 }
190
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244 throw new HgBadStateException(String.format("Can't find index of %s for file %s", p.shortNotation(), filename));
186
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245 }
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246
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247 public boolean element(GroupElement ge) {
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248 try {
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249 assert indexFile != null;
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250 boolean writeComplete = false;
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251 Nodeid p1 = ge.firstParent();
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252 Nodeid p2 = ge.secondParent();
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253 if (NULL.equals(p1) && NULL.equals(p2) /* or forced flag, does REVIDX_PUNCHED_FLAG indicate that? */) {
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254 prevRevContent = new ByteArrayDataAccess(new byte[0]);
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255 writeComplete = true;
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256 }
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257 byte[] content = ge.apply(prevRevContent);
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258 byte[] calculated = dh.sha1(p1, p2, content).asBinary();
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259 final Nodeid node = ge.node();
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260 if (!node.equalsTo(calculated)) {
190
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261 throw new HgBadStateException(String.format("Checksum failed: expected %s, calculated %s. File %s", node, calculated, filename));
186
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262 }
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263 final int link;
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264 if (collectChangelogIndexes) {
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265 changelogIndexes.put(node, revisionSequence.size());
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266 link = revisionSequence.size();
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267 } else {
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268 Integer csRev = changelogIndexes.get(ge.cset());
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269 if (csRev == null) {
190
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270 throw new HgBadStateException(String.format("Changelog doesn't contain revision %s of %s", ge.cset().shortNotation(), filename));
186
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271 }
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272 link = csRev.intValue();
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273 }
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274 final int p1Rev = knownRevision(p1), p2Rev = knownRevision(p2);
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275 DataAccess patchContent = ge.rawData();
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276 writeComplete = writeComplete || patchContent.length() >= (/* 3/4 of actual */content.length - (content.length >>> 2));
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277 if (writeComplete) {
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278 base = revisionSequence.size();
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279 }
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280 final byte[] sourceData = writeComplete ? content : patchContent.byteArray();
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281 final byte[] data;
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282 ByteArrayOutputStream bos = new ByteArrayOutputStream(content.length);
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283 DeflaterOutputStream dos = new DeflaterOutputStream(bos);
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284 dos.write(sourceData);
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285 dos.close();
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286 final byte[] compressedData = bos.toByteArray();
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287 dos = null;
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288 bos = null;
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289 final Byte dataPrefix;
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290 if (compressedData.length >= (sourceData.length - (sourceData.length >>> 2))) {
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291 // compression wasn't too effective,
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292 data = sourceData;
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293 dataPrefix = 'u';
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294 } else {
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295 data = compressedData;
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296 dataPrefix = null;
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297 }
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298
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299 ByteBuffer header = ByteBuffer.allocate(64 /* REVLOGV1_RECORD_SIZE */);
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300 if (offset == 0) {
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301 final int INLINEDATA = 1 << 16;
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302 header.putInt(1 /* RevlogNG */ | INLINEDATA);
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303 header.putInt(0);
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304 } else {
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305 header.putLong(offset << 16);
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306 }
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307 final int compressedLen = data.length + (dataPrefix == null ? 0 : 1);
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308 header.putInt(compressedLen);
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309 header.putInt(content.length);
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310 header.putInt(base);
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311 header.putInt(link);
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312 header.putInt(p1Rev);
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313 header.putInt(p2Rev);
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314 header.put(node.toByteArray());
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315 // assume 12 bytes left are zeros
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diff changeset
316 indexFile.write(header.array());
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317 if (dataPrefix != null) {
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318 indexFile.write(dataPrefix.byteValue());
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319 }
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320 indexFile.write(data);
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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321 //
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322 offset += compressedLen;
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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323 revisionSequence.add(node);
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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324 prevRevContent.done();
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325 prevRevContent = new ByteArrayDataAccess(content);
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326 } catch (IOException ex) {
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327 throw new HgBadStateException(ex);
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parents:
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328 }
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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329 return true;
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parents:
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330 }
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parents:
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331 }
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parents:
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332
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333 }