Mercurial > hg4j

annotate cmdline/org/tmatesoft/hg/console/Clone.java @ 171:2c3e96674e2a

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Towards outgoing changes - initial detection logic, get connected with remote repo stub
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 25 Mar 2011 00:05:52 +0100
parents 71ddbf8603e8
children 44a34baabea0
rev   line source
170
71ddbf8603e8 Initial clone: populate given directory from a bundle. Everything but remote server access is there, albeit prototype code style
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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
71ddbf8603e8 Initial clone: populate given directory from a bundle. Everything but remote server access is there, albeit prototype code style
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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.console;
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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 import static org.tmatesoft.hg.internal.RequiresFile.DOTENCODE;
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22 import static org.tmatesoft.hg.internal.RequiresFile.FNCACHE;
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23
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24 import java.io.ByteArrayOutputStream;
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25 import java.io.File;
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26 import java.io.FileOutputStream;
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27 import java.io.IOException;
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28 import java.net.URL;
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29 import java.nio.ByteBuffer;
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30 import java.util.ArrayList;
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31 import java.util.Collections;
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32 import java.util.LinkedList;
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33 import java.util.List;
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34 import java.util.TreeMap;
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35 import java.util.zip.DeflaterOutputStream;
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36
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37 import org.tmatesoft.hg.core.HgBadStateException;
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38 import org.tmatesoft.hg.core.HgRepoFacade;
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39 import org.tmatesoft.hg.core.Nodeid;
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40 import org.tmatesoft.hg.internal.ByteArrayDataAccess;
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41 import org.tmatesoft.hg.internal.DataAccess;
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42 import org.tmatesoft.hg.internal.DigestHelper;
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43 import org.tmatesoft.hg.internal.Internals;
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44 import org.tmatesoft.hg.internal.RequiresFile;
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45 import org.tmatesoft.hg.internal.RevlogStream;
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46 import org.tmatesoft.hg.repo.HgBundle;
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47 import org.tmatesoft.hg.repo.HgLookup;
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48 import org.tmatesoft.hg.repo.HgRemoteRepository;
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49 import org.tmatesoft.hg.repo.HgBundle.GroupElement;
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50 import org.tmatesoft.hg.repo.HgRepository;
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51 import org.tmatesoft.hg.util.PathRewrite;
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52
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53 /**
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54 * WORK IN PROGRESS, DO NOT USE
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55 *
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56 * @author Artem Tikhomirov
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57 * @author TMate Software Ltd.
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58 */
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59 public class Clone {
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60 /*
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61 * Changegroup:
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62 * http://mercurial.selenic.com/wiki/Merge
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63 * http://mercurial.selenic.com/wiki/WireProtocol
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64 *
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65 * according to latter, bundleformat data is sent through zlib
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66 * (there's no header like HG10?? with the server output, though,
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67 * as one may expect according to http://mercurial.selenic.com/wiki/BundleFormat)
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68 */
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69 public static void main(String[] args) throws Exception {
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70 Options cmdLineOpts = Options.parse(args);
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71 HgRepoFacade hgRepo = new HgRepoFacade();
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72 if (!hgRepo.init(cmdLineOpts.findRepository())) {
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73 System.err.printf("Can't find repository in: %s\n", hgRepo.getRepository().getLocation());
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74 return;
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75 }
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76 File destDir = new File("/temp/hg/clone-01/");
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77 if (destDir.exists()) {
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78 if (!destDir.isDirectory()) {
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79 throw new IllegalArgumentException();
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80 } else if (destDir.list().length > 0) {
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81 throw new IllegalArgumentException();
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82 }
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83 } else {
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84 destDir.mkdirs();
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85 }
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86 // if cloning remote repo, which can stream and no revision is specified -
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87 // can use 'stream_out' wireproto
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88 //
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89 // //////// 1. from Remote.java take code that asks changegroup from remote server and write it down to temp file
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90 // //////// 2. then, read the file with HgBundle
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91 // //////// 3. process changelog, memorize nodeids to index
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92 // //////// 4. process manifest, using map from step 3, collect manifest nodeids
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93 // //////// 5. process every file, using map from 3, and consult set from step 4 to ensure repo is correct
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94 // access source
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95 HgRemoteRepository remoteRepo = new HgLookup().detect(new URL("https://asd/hg/"));
170
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96 // discover changes
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97 HgBundle completeChanges = remoteRepo.getChanges(Collections.singletonList(NULL));
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98 WriteDownMate mate = new WriteDownMate(destDir);
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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 // completeChanges.unlink();
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105 }
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106
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107 private static class WriteDownMate implements HgBundle.Inspector {
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108 private final File hgDir;
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109 private FileOutputStream indexFile;
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110 private final PathRewrite storagePathHelper;
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111
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112 private final TreeMap<Nodeid, Integer> changelogIndexes = new TreeMap<Nodeid, Integer>();
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113 private boolean collectChangelogIndexes = false;
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114
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115 private int base = -1;
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116 private long offset = 0;
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117 private DataAccess prevRevContent;
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118 private final DigestHelper dh = new DigestHelper();
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119 private final ArrayList<Nodeid> revisionSequence = new ArrayList<Nodeid>(); // last visited nodes first
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120
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121 private final LinkedList<String> fncacheFiles = new LinkedList<String>();
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122
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123 public WriteDownMate(File destDir) {
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124 hgDir = new File(destDir, ".hg");
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125 Internals i = new Internals();
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126 i.setStorageConfig(1, STORE | FNCACHE | DOTENCODE);
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127 storagePathHelper = i.buildDataFilesHelper();
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128 }
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129
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130 public void initEmptyRepository() throws IOException {
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131 hgDir.mkdir();
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132 FileOutputStream requiresFile = new FileOutputStream(new File(hgDir, "requires"));
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133 requiresFile.write("revlogv1\nstore\nfncache\ndotencode\n".getBytes());
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134 requiresFile.close();
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135 new File(hgDir, "store").mkdir(); // with that, hg verify says ok.
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136 }
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137
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138 public void complete() throws IOException {
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139 FileOutputStream fncacheFile = new FileOutputStream(new File(hgDir, "store/fncache"));
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140 for (String s : fncacheFiles) {
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141 fncacheFile.write(s.getBytes());
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142 fncacheFile.write(0x0A); // http://mercurial.selenic.com/wiki/fncacheRepoFormat
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143 }
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144 fncacheFile.close();
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145 }
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146
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147 public void changelogStart() {
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148 try {
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149 base = -1;
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150 offset = 0;
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151 revisionSequence.clear();
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152 indexFile = new FileOutputStream(new File(hgDir, "store/00changelog.i"));
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153 collectChangelogIndexes = true;
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154 } catch (IOException ex) {
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155 throw new HgBadStateException(ex);
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156 }
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157 }
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158
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159 public void changelogEnd() {
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160 try {
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161 if (prevRevContent != null) {
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162 prevRevContent.done();
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163 prevRevContent = null;
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164 }
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165 collectChangelogIndexes = false;
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166 indexFile.close();
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167 indexFile = null;
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168 } catch (IOException ex) {
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169 throw new HgBadStateException(ex);
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170 }
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171 }
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172
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173 public void manifestStart() {
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174 try {
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175 base = -1;
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176 offset = 0;
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177 revisionSequence.clear();
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178 indexFile = new FileOutputStream(new File(hgDir, "store/00manifest.i"));
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179 } catch (IOException ex) {
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180 throw new HgBadStateException(ex);
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181 }
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182 }
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183
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184 public void manifestEnd() {
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185 try {
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186 if (prevRevContent != null) {
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187 prevRevContent.done();
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188 prevRevContent = null;
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189 }
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190 indexFile.close();
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191 indexFile = null;
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192 } catch (IOException ex) {
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193 throw new HgBadStateException(ex);
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194 }
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195 }
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196
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197 public void fileStart(String name) {
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198 try {
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199 base = -1;
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200 offset = 0;
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201 revisionSequence.clear();
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202 fncacheFiles.add("data/" + name + ".i"); // FIXME this is pure guess,
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203 // need to investigate more how filenames are kept in fncache
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204 File file = new File(hgDir, storagePathHelper.rewrite(name));
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205 file.getParentFile().mkdirs();
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206 indexFile = new FileOutputStream(file);
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207 } catch (IOException ex) {
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208 throw new HgBadStateException(ex);
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209 }
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210 }
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211
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212 public void fileEnd(String name) {
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213 try {
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214 if (prevRevContent != null) {
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215 prevRevContent.done();
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216 prevRevContent = null;
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217 }
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218 indexFile.close();
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219 indexFile = null;
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220 } catch (IOException ex) {
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221 throw new HgBadStateException(ex);
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222 }
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223 }
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224
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225 private int knownRevision(Nodeid p) {
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226 if (NULL.equals(p)) {
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227 return -1;
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228 } else {
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229 for (int i = revisionSequence.size() - 1; i >= 0; i--) {
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230 if (revisionSequence.get(i).equals(p)) {
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231 return i;
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232 }
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233 }
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234 }
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235 throw new HgBadStateException(String.format("Can't find index of %s", p.shortNotation()));
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236 }
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237
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238 public boolean element(GroupElement ge) {
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239 try {
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240 assert indexFile != null;
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241 boolean writeComplete = false;
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242 Nodeid p1 = ge.firstParent();
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243 Nodeid p2 = ge.secondParent();
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244 if (NULL.equals(p1) && NULL.equals(p2) /* or forced flag, does REVIDX_PUNCHED_FLAG indicate that? */) {
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245 prevRevContent = new ByteArrayDataAccess(new byte[0]);
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246 writeComplete = true;
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247 }
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248 byte[] content = ge.apply(prevRevContent);
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249 byte[] calculated = dh.sha1(p1, p2, content).asBinary();
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250 final Nodeid node = ge.node();
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251 if (!node.equalsTo(calculated)) {
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252 throw new HgBadStateException("Checksum failed");
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253 }
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254 final int link;
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255 if (collectChangelogIndexes) {
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256 changelogIndexes.put(node, revisionSequence.size());
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257 link = revisionSequence.size();
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258 } else {
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259 Integer csRev = changelogIndexes.get(ge.cset());
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260 if (csRev == null) {
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261 throw new HgBadStateException(String.format("Changelog doesn't contain revision %s", ge.cset().shortNotation()));
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262 }
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263 link = csRev.intValue();
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264 }
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265 final int p1Rev = knownRevision(p1), p2Rev = knownRevision(p2);
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266 DataAccess patchContent = ge.rawData();
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267 writeComplete = writeComplete || patchContent.length() >= (/* 3/4 of actual */content.length - (content.length >>> 2));
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268 if (writeComplete) {
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269 base = revisionSequence.size();
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270 }
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271 final byte[] sourceData = writeComplete ? content : patchContent.byteArray();
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272 final byte[] data;
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273 ByteArrayOutputStream bos = new ByteArrayOutputStream(content.length);
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274 DeflaterOutputStream dos = new DeflaterOutputStream(bos);
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275 dos.write(sourceData);
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276 dos.close();
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277 final byte[] compressedData = bos.toByteArray();
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278 dos = null;
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279 bos = null;
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280 final Byte dataPrefix;
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281 if (compressedData.length >= (sourceData.length - (sourceData.length >>> 2))) {
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282 // compression wasn't too effective,
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283 data = sourceData;
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284 dataPrefix = 'u';
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285 } else {
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286 data = compressedData;
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287 dataPrefix = null;
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288 }
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289
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290 ByteBuffer header = ByteBuffer.allocate(64 /* REVLOGV1_RECORD_SIZE */);
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291 if (offset == 0) {
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292 final int INLINEDATA = 1 << 16;
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293 header.putInt(1 /* RevlogNG */ | INLINEDATA);
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294 header.putInt(0);
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295 } else {
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296 header.putLong(offset << 16);
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297 }
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298 final int compressedLen = data.length + (dataPrefix == null ? 0 : 1);
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299 header.putInt(compressedLen);
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300 header.putInt(content.length);
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301 header.putInt(base);
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302 header.putInt(link);
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303 header.putInt(p1Rev);
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304 header.putInt(p2Rev);
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305 header.put(node.toByteArray());
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306 // assume 12 bytes left are zeros
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307 indexFile.write(header.array());
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308 if (dataPrefix != null) {
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309 indexFile.write(dataPrefix.byteValue());
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310 }
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311 indexFile.write(data);
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312 //
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313 offset += compressedLen;
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314 revisionSequence.add(node);
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315 prevRevContent.done();
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316 prevRevContent = new ByteArrayDataAccess(content);
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317 } catch (IOException ex) {
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318 throw new HgBadStateException(ex);
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319 }
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320 return true;
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321 }
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322 }
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323 }