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annotate src/org/tmatesoft/hg/core/HgCloneCommand.java @ 417:ccd7d25e5aea

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New and better name for HgFileInformer - HgChangesetFileSneaker. Explain (comments) ties between HgManifest, HgDataFile, HgChangesetFileSneaker and reasons for method placement
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 22 Mar 2012 20:14:06 +0100
parents 6952d9ce97f1
children 528b6780a8bd
rev   line source
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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.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.HgLookup;
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41 import org.tmatesoft.hg.repo.HgRemoteRepository;
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42 import org.tmatesoft.hg.repo.HgRepository;
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43 import org.tmatesoft.hg.util.CancelledException;
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44 import org.tmatesoft.hg.util.PathRewrite;
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45
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46 /**
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47 * WORK IN PROGRESS, DO NOT USE
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48 *
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49 * @author Artem Tikhomirov
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50 * @author TMate Software Ltd.
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51 */
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52 public class HgCloneCommand {
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53
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54 private File destination;
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55 private HgRemoteRepository srcRepo;
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56
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57 public HgCloneCommand() {
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58 }
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59
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60 /**
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61 * @param folder location to become root of the repository (i.e. where <em>.hg</em> folder would reside). Either
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62 * shall not exist or be empty otherwise.
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63 * @return <code>this</code> for convenience
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64 */
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65 public HgCloneCommand destination(File folder) {
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66 destination = folder;
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67 return this;
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68 }
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69
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70 public HgCloneCommand source(HgRemoteRepository hgRemote) {
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71 srcRepo = hgRemote;
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72 return this;
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73 }
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74
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75 public HgRepository execute() throws HgBadArgumentException, HgRemoteConnectionException, HgInvalidFileException, CancelledException {
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76 if (destination == null) {
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77 throw new IllegalArgumentException("Destination not set", null);
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78 }
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79 if (srcRepo == null || srcRepo.isInvalid()) {
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80 throw new HgBadArgumentException("Bad source repository", null);
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81 }
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82 if (destination.exists()) {
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83 if (!destination.isDirectory()) {
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84 throw new HgBadArgumentException(String.format("%s is not a directory", destination), null);
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85 } else if (destination.list().length > 0) {
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86 throw new HgBadArgumentException(String.format("% shall be empty", destination), null);
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87 }
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88 } else {
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89 destination.mkdirs();
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90 }
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91 // if cloning remote repo, which can stream and no revision is specified -
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92 // can use 'stream_out' wireproto
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93 //
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94 // pull all changes from the very beginning
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95 // XXX consult getContext() if by any chance has a bundle ready, if not, then read and register
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96 HgBundle completeChanges = srcRepo.getChanges(Collections.singletonList(NULL));
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97 WriteDownMate mate = new WriteDownMate(destination);
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98 try {
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99 // instantiate new repo in the destdir
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100 mate.initEmptyRepository();
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101 // pull changes
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102 completeChanges.inspectAll(mate);
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103 mate.complete();
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104 } catch (IOException ex) {
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105 throw new HgInvalidFileException(getClass().getName(), ex);
186
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106 } finally {
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107 completeChanges.unlink();
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108 }
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109 return new HgLookup().detect(destination);
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110 }
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111
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112
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113 // 1. process changelog, memorize nodeids to index
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114 // 2. process manifest, using map from step 3, collect manifest nodeids
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115 // 3. process every file, using map from 3, and consult set from step 4 to ensure repo is correct
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116 private static class WriteDownMate implements HgBundle.Inspector {
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117 private final File hgDir;
190
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118 private final PathRewrite storagePathHelper;
186
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119 private FileOutputStream indexFile;
190
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120 private String filename; // human-readable name of the file being written, for log/exception purposes
186
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121
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122 private final TreeMap<Nodeid, Integer> changelogIndexes = new TreeMap<Nodeid, Integer>();
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123 private boolean collectChangelogIndexes = false;
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124
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125 private int base = -1;
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126 private long offset = 0;
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127 private DataAccess prevRevContent;
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128 private final DigestHelper dh = new DigestHelper();
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129 private final ArrayList<Nodeid> revisionSequence = new ArrayList<Nodeid>(); // last visited nodes first
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130
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131 private final LinkedList<String> fncacheFiles = new LinkedList<String>();
202
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132 private Internals implHelper;
186
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133
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134 public WriteDownMate(File destDir) {
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135 hgDir = new File(destDir, ".hg");
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136 implHelper = new Internals(new BasicSessionContext(null, null));
202
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137 implHelper.setStorageConfig(1, STORE | FNCACHE | DOTENCODE);
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138 storagePathHelper = implHelper.buildDataFilesHelper();
186
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139 }
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140
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141 public void initEmptyRepository() throws IOException {
202
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142 implHelper.initEmptyRepository(hgDir);
186
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143 }
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144
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145 public void complete() throws IOException {
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146 FileOutputStream fncacheFile = new FileOutputStream(new File(hgDir, "store/fncache"));
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147 for (String s : fncacheFiles) {
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148 fncacheFile.write(s.getBytes());
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149 fncacheFile.write(0x0A); // http://mercurial.selenic.com/wiki/fncacheRepoFormat
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150 }
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151 fncacheFile.close();
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152 }
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153
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154 public void changelogStart() {
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155 try {
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156 base = -1;
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157 offset = 0;
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158 revisionSequence.clear();
190
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159 indexFile = new FileOutputStream(new File(hgDir, filename = "store/00changelog.i"));
186
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160 collectChangelogIndexes = true;
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161 } catch (IOException ex) {
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162 throw new HgBadStateException(ex);
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163 }
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164 }
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165
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166 public void changelogEnd() {
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167 try {
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168 if (prevRevContent != null) {
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169 prevRevContent.done();
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170 prevRevContent = null;
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171 }
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172 collectChangelogIndexes = false;
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173 indexFile.close();
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174 indexFile = null;
190
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175 filename = null;
186
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176 } catch (IOException ex) {
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177 throw new HgBadStateException(ex);
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178 }
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179 }
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180
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181 public void manifestStart() {
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182 try {
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183 base = -1;
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184 offset = 0;
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185 revisionSequence.clear();
190
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186 indexFile = new FileOutputStream(new File(hgDir, filename = "store/00manifest.i"));
186
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187 } catch (IOException ex) {
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188 throw new HgBadStateException(ex);
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189 }
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190 }
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191
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192 public void manifestEnd() {
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193 try {
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194 if (prevRevContent != null) {
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195 prevRevContent.done();
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196 prevRevContent = null;
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197 }
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198 indexFile.close();
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199 indexFile = null;
190
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200 filename = null;
186
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201 } catch (IOException ex) {
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202 throw new HgBadStateException(ex);
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203 }
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204 }
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205
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206 public void fileStart(String name) {
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207 try {
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208 base = -1;
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209 offset = 0;
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210 revisionSequence.clear();
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211 fncacheFiles.add("data/" + name + ".i"); // FIXME this is pure guess,
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212 // need to investigate more how filenames are kept in fncache
292
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213 File file = new File(hgDir, filename = storagePathHelper.rewrite(name).toString());
186
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214 file.getParentFile().mkdirs();
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215 indexFile = new FileOutputStream(file);
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216 } catch (IOException ex) {
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217 throw new HgBadStateException(ex);
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218 }
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219 }
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220
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221 public void fileEnd(String name) {
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222 try {
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223 if (prevRevContent != null) {
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224 prevRevContent.done();
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225 prevRevContent = null;
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226 }
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227 indexFile.close();
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228 indexFile = null;
190
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229 filename = null;
186
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230 } catch (IOException ex) {
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231 throw new HgBadStateException(ex);
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232 }
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233 }
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234
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235 private int knownRevision(Nodeid p) {
274
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236 if (p.isNull()) {
186
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237 return -1;
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238 } else {
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239 for (int i = revisionSequence.size() - 1; i >= 0; i--) {
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240 if (revisionSequence.get(i).equals(p)) {
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241 return i;
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242 }
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243 }
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244 }
190
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245 throw new HgBadStateException(String.format("Can't find index of %s for file %s", p.shortNotation(), filename));
186
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246 }
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247
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248 public boolean element(GroupElement ge) {
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249 try {
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250 assert indexFile != null;
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251 boolean writeComplete = false;
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252 Nodeid p1 = ge.firstParent();
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253 Nodeid p2 = ge.secondParent();
274
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254 if (p1.isNull() && p2.isNull() /* or forced flag, does REVIDX_PUNCHED_FLAG indicate that? */) {
186
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255 prevRevContent = new ByteArrayDataAccess(new byte[0]);
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256 writeComplete = true;
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257 }
358
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258 byte[] content = ge.apply(prevRevContent.byteArray());
186
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259 byte[] calculated = dh.sha1(p1, p2, content).asBinary();
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260 final Nodeid node = ge.node();
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261 if (!node.equalsTo(calculated)) {
190
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diff changeset
262 throw new HgBadStateException(String.format("Checksum failed: expected %s, calculated %s. File %s", node, calculated, filename));
186
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263 }
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264 final int link;
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265 if (collectChangelogIndexes) {
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266 changelogIndexes.put(node, revisionSequence.size());
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267 link = revisionSequence.size();
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268 } else {
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269 Integer csRev = changelogIndexes.get(ge.cset());
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270 if (csRev == null) {
190
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diff changeset
271 throw new HgBadStateException(String.format("Changelog doesn't contain revision %s of %s", ge.cset().shortNotation(), filename));
186
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272 }
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273 link = csRev.intValue();
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274 }
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275 final int p1Rev = knownRevision(p1), p2Rev = knownRevision(p2);
358
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diff changeset
276 byte[] patchContent = ge.rawDataByteArray();
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diff changeset
277 writeComplete = writeComplete || patchContent.length >= (/* 3/4 of actual */content.length - (content.length >>> 2));
186
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278 if (writeComplete) {
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279 base = revisionSequence.size();
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280 }
358
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diff changeset
281 final byte[] sourceData = writeComplete ? content : patchContent;
186
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282 final byte[] data;
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283 ByteArrayOutputStream bos = new ByteArrayOutputStream(content.length);
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284 DeflaterOutputStream dos = new DeflaterOutputStream(bos);
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285 dos.write(sourceData);
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286 dos.close();
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287 final byte[] compressedData = bos.toByteArray();
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288 dos = null;
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289 bos = null;
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290 final Byte dataPrefix;
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291 if (compressedData.length >= (sourceData.length - (sourceData.length >>> 2))) {
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292 // compression wasn't too effective,
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293 data = sourceData;
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294 dataPrefix = 'u';
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295 } else {
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296 data = compressedData;
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297 dataPrefix = null;
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298 }
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299
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300 ByteBuffer header = ByteBuffer.allocate(64 /* REVLOGV1_RECORD_SIZE */);
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diff changeset
301 if (offset == 0) {
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302 final int INLINEDATA = 1 << 16;
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303 header.putInt(1 /* RevlogNG */ | INLINEDATA);
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304 header.putInt(0);
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305 } else {
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306 header.putLong(offset << 16);
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307 }
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308 final int compressedLen = data.length + (dataPrefix == null ? 0 : 1);
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309 header.putInt(compressedLen);
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diff changeset
310 header.putInt(content.length);
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311 header.putInt(base);
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312 header.putInt(link);
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313 header.putInt(p1Rev);
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314 header.putInt(p2Rev);
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315 header.put(node.toByteArray());
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316 // assume 12 bytes left are zeros
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diff changeset
317 indexFile.write(header.array());
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diff changeset
318 if (dataPrefix != null) {
44a34baabea0 Clone refactored into a command. HgBundle needs means to control its lifecycle, to be deleted when no longer needed
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parents:
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319 indexFile.write(dataPrefix.byteValue());
44a34baabea0 Clone refactored into a command. HgBundle needs means to control its lifecycle, to be deleted when no longer needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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320 }
44a34baabea0 Clone refactored into a command. HgBundle needs means to control its lifecycle, to be deleted when no longer needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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321 indexFile.write(data);
44a34baabea0 Clone refactored into a command. HgBundle needs means to control its lifecycle, to be deleted when no longer needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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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
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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323 offset += compressedLen;
44a34baabea0 Clone refactored into a command. HgBundle needs means to control its lifecycle, to be deleted when no longer needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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324 revisionSequence.add(node);
44a34baabea0 Clone refactored into a command. HgBundle needs means to control its lifecycle, to be deleted when no longer needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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325 prevRevContent.done();
44a34baabea0 Clone refactored into a command. HgBundle needs means to control its lifecycle, to be deleted when no longer needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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326 prevRevContent = new ByteArrayDataAccess(content);
44a34baabea0 Clone refactored into a command. HgBundle needs means to control its lifecycle, to be deleted when no longer needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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327 } catch (IOException ex) {
44a34baabea0 Clone refactored into a command. HgBundle needs means to control its lifecycle, to be deleted when no longer needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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328 throw new HgBadStateException(ex);
44a34baabea0 Clone refactored into a command. HgBundle needs means to control its lifecycle, to be deleted when no longer needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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329 }
44a34baabea0 Clone refactored into a command. HgBundle needs means to control its lifecycle, to be deleted when no longer needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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330 return true;
44a34baabea0 Clone refactored into a command. HgBundle needs means to control its lifecycle, to be deleted when no longer needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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331 }
44a34baabea0 Clone refactored into a command. HgBundle needs means to control its lifecycle, to be deleted when no longer needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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332 }
44a34baabea0 Clone refactored into a command. HgBundle needs means to control its lifecycle, to be deleted when no longer needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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333
44a34baabea0 Clone refactored into a command. HgBundle needs means to control its lifecycle, to be deleted when no longer needed
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334 }