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annotate src/org/tmatesoft/hg/core/HgCloneCommand.java @ 186:44a34baabea0

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Clone refactored into a command. HgBundle needs means to control its lifecycle, to be deleted when no longer needed
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 14 Apr 2011 00:47:04 +0200
parents
children 9b99d27aeddc
rev   line source
186
44a34baabea0 Clone refactored into a command. HgBundle needs means to control its lifecycle, to be deleted when no longer needed
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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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32
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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
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59 public HgCloneCommand destination(File folder) {
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60 destination = folder;
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61 return this;
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62 }
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63
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64 public HgCloneCommand source(HgRemoteRepository hgRemote) {
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65 srcRepo = hgRemote;
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66 return this;
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67 }
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68
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69 public HgRepository execute() throws HgException, CancelledException {
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70 if (destination == null) {
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71 throw new HgBadArgumentException("Destination not set", null);
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72 }
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73 if (srcRepo == null || srcRepo.isInvalid()) {
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74 throw new HgBadArgumentException("Bad source repository", null);
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75 }
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76 if (destination.exists()) {
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77 if (!destination.isDirectory()) {
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78 throw new HgBadArgumentException(String.format("%s is not a directory", destination), null);
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79 } else if (destination.list().length > 0) {
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80 throw new HgBadArgumentException(String.format("% shall be empty", destination), null);
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81 }
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82 } else {
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83 destination.mkdirs();
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84 }
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85 // if cloning remote repo, which can stream and no revision is specified -
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86 // can use 'stream_out' wireproto
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87 //
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88 // pull all changes from the very beginning
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89 // XXX consult getContext() if by any chance has a bundle ready, if not, then read and register
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90 HgBundle completeChanges = srcRepo.getChanges(Collections.singletonList(NULL));
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91 WriteDownMate mate = new WriteDownMate(destination);
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92 try {
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93 // instantiate new repo in the destdir
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94 mate.initEmptyRepository();
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95 // pull changes
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96 completeChanges.inspectAll(mate);
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97 mate.complete();
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98 } catch (IOException ex) {
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99 throw new HgException(ex);
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100 } finally {
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101 completeChanges.unlink();
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102 }
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103 return new HgLookup().detect(destination);
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104 }
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105
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106
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107 // 1. process changelog, memorize nodeids to index
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108 // 2. process manifest, using map from step 3, collect manifest nodeids
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109 // 3. process every file, using map from 3, and consult set from step 4 to ensure repo is correct
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110 private static class WriteDownMate implements HgBundle.Inspector {
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111 private final File hgDir;
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112 private FileOutputStream indexFile;
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113 private final PathRewrite storagePathHelper;
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114
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115 private final TreeMap<Nodeid, Integer> changelogIndexes = new TreeMap<Nodeid, Integer>();
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116 private boolean collectChangelogIndexes = false;
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117
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118 private int base = -1;
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119 private long offset = 0;
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120 private DataAccess prevRevContent;
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121 private final DigestHelper dh = new DigestHelper();
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122 private final ArrayList<Nodeid> revisionSequence = new ArrayList<Nodeid>(); // last visited nodes first
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123
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124 private final LinkedList<String> fncacheFiles = new LinkedList<String>();
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125
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126 public WriteDownMate(File destDir) {
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127 hgDir = new File(destDir, ".hg");
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128 Internals i = new Internals();
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129 i.setStorageConfig(1, STORE | FNCACHE | DOTENCODE);
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130 storagePathHelper = i.buildDataFilesHelper();
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131 }
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132
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133 public void initEmptyRepository() throws IOException {
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134 hgDir.mkdir();
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135 FileOutputStream requiresFile = new FileOutputStream(new File(hgDir, "requires"));
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136 requiresFile.write("revlogv1\nstore\nfncache\ndotencode\n".getBytes());
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137 requiresFile.close();
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138 new File(hgDir, "store").mkdir(); // with that, hg verify says ok.
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139 }
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140
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141 public void complete() throws IOException {
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142 FileOutputStream fncacheFile = new FileOutputStream(new File(hgDir, "store/fncache"));
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143 for (String s : fncacheFiles) {
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144 fncacheFile.write(s.getBytes());
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145 fncacheFile.write(0x0A); // http://mercurial.selenic.com/wiki/fncacheRepoFormat
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146 }
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147 fncacheFile.close();
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148 }
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149
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150 public void changelogStart() {
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151 try {
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152 base = -1;
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153 offset = 0;
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154 revisionSequence.clear();
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155 indexFile = new FileOutputStream(new File(hgDir, "store/00changelog.i"));
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156 collectChangelogIndexes = true;
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157 } catch (IOException ex) {
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158 throw new HgBadStateException(ex);
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159 }
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160 }
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161
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162 public void changelogEnd() {
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163 try {
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164 if (prevRevContent != null) {
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165 prevRevContent.done();
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166 prevRevContent = null;
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167 }
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168 collectChangelogIndexes = false;
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169 indexFile.close();
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170 indexFile = null;
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171 } catch (IOException ex) {
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172 throw new HgBadStateException(ex);
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173 }
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174 }
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175
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176 public void manifestStart() {
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177 try {
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178 base = -1;
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179 offset = 0;
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180 revisionSequence.clear();
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181 indexFile = new FileOutputStream(new File(hgDir, "store/00manifest.i"));
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182 } catch (IOException ex) {
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183 throw new HgBadStateException(ex);
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184 }
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185 }
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186
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187 public void manifestEnd() {
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188 try {
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189 if (prevRevContent != null) {
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190 prevRevContent.done();
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191 prevRevContent = null;
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192 }
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193 indexFile.close();
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194 indexFile = null;
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195 } catch (IOException ex) {
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196 throw new HgBadStateException(ex);
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197 }
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198 }
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199
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200 public void fileStart(String name) {
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201 try {
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202 base = -1;
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203 offset = 0;
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204 revisionSequence.clear();
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205 fncacheFiles.add("data/" + name + ".i"); // FIXME this is pure guess,
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206 // need to investigate more how filenames are kept in fncache
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207 File file = new File(hgDir, storagePathHelper.rewrite(name));
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208 file.getParentFile().mkdirs();
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209 indexFile = new FileOutputStream(file);
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210 } catch (IOException ex) {
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211 throw new HgBadStateException(ex);
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212 }
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213 }
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214
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215 public void fileEnd(String name) {
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216 try {
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217 if (prevRevContent != null) {
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218 prevRevContent.done();
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219 prevRevContent = null;
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220 }
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221 indexFile.close();
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222 indexFile = null;
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223 } catch (IOException ex) {
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224 throw new HgBadStateException(ex);
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225 }
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226 }
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227
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228 private int knownRevision(Nodeid p) {
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229 if (NULL.equals(p)) {
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230 return -1;
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231 } else {
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232 for (int i = revisionSequence.size() - 1; i >= 0; i--) {
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233 if (revisionSequence.get(i).equals(p)) {
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234 return i;
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235 }
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236 }
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237 }
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238 throw new HgBadStateException(String.format("Can't find index of %s", p.shortNotation()));
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239 }
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240
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241 public boolean element(GroupElement ge) {
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242 try {
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243 assert indexFile != null;
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244 boolean writeComplete = false;
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245 Nodeid p1 = ge.firstParent();
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246 Nodeid p2 = ge.secondParent();
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247 if (NULL.equals(p1) && NULL.equals(p2) /* or forced flag, does REVIDX_PUNCHED_FLAG indicate that? */) {
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248 prevRevContent = new ByteArrayDataAccess(new byte[0]);
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249 writeComplete = true;
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250 }
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251 byte[] content = ge.apply(prevRevContent);
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252 byte[] calculated = dh.sha1(p1, p2, content).asBinary();
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253 final Nodeid node = ge.node();
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254 if (!node.equalsTo(calculated)) {
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255 throw new HgBadStateException("Checksum failed");
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256 }
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257 final int link;
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258 if (collectChangelogIndexes) {
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259 changelogIndexes.put(node, revisionSequence.size());
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260 link = revisionSequence.size();
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261 } else {
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262 Integer csRev = changelogIndexes.get(ge.cset());
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263 if (csRev == null) {
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264 throw new HgBadStateException(String.format("Changelog doesn't contain revision %s", ge.cset().shortNotation()));
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265 }
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266 link = csRev.intValue();
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267 }
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268 final int p1Rev = knownRevision(p1), p2Rev = knownRevision(p2);
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269 DataAccess patchContent = ge.rawData();
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270 writeComplete = writeComplete || patchContent.length() >= (/* 3/4 of actual */content.length - (content.length >>> 2));
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271 if (writeComplete) {
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272 base = revisionSequence.size();
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273 }
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274 final byte[] sourceData = writeComplete ? content : patchContent.byteArray();
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275 final byte[] data;
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276 ByteArrayOutputStream bos = new ByteArrayOutputStream(content.length);
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277 DeflaterOutputStream dos = new DeflaterOutputStream(bos);
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278 dos.write(sourceData);
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279 dos.close();
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280 final byte[] compressedData = bos.toByteArray();
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281 dos = null;
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282 bos = null;
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283 final Byte dataPrefix;
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284 if (compressedData.length >= (sourceData.length - (sourceData.length >>> 2))) {
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285 // compression wasn't too effective,
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286 data = sourceData;
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287 dataPrefix = 'u';
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288 } else {
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289 data = compressedData;
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290 dataPrefix = null;
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291 }
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292
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293 ByteBuffer header = ByteBuffer.allocate(64 /* REVLOGV1_RECORD_SIZE */);
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294 if (offset == 0) {
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295 final int INLINEDATA = 1 << 16;
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296 header.putInt(1 /* RevlogNG */ | INLINEDATA);
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297 header.putInt(0);
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298 } else {
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299 header.putLong(offset << 16);
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300 }
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301 final int compressedLen = data.length + (dataPrefix == null ? 0 : 1);
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302 header.putInt(compressedLen);
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303 header.putInt(content.length);
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304 header.putInt(base);
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305 header.putInt(link);
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306 header.putInt(p1Rev);
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307 header.putInt(p2Rev);
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308 header.put(node.toByteArray());
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309 // assume 12 bytes left are zeros
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diff changeset
310 indexFile.write(header.array());
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diff changeset
311 if (dataPrefix != null) {
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diff changeset
312 indexFile.write(dataPrefix.byteValue());
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313 }
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314 indexFile.write(data);
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315 //
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diff changeset
316 offset += compressedLen;
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317 revisionSequence.add(node);
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318 prevRevContent.done();
44a34baabea0 Clone refactored into a command. HgBundle needs means to control its lifecycle, to be deleted when no longer needed
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319 prevRevContent = new ByteArrayDataAccess(content);
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320 } catch (IOException ex) {
44a34baabea0 Clone refactored into a command. HgBundle needs means to control its lifecycle, to be deleted when no longer needed
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321 throw new HgBadStateException(ex);
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322 }
44a34baabea0 Clone refactored into a command. HgBundle needs means to control its lifecycle, to be deleted when no longer needed
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323 return true;
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324 }
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325 }
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parents:
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326
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327 }