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annotate src/org/tmatesoft/hg/internal/Internals.java @ 584:ed243b668502

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Conditionally enable effective patch merge alternative for revlog reading
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 25 Apr 2013 16:08:17 +0200
parents 36e36b926747
children e447384f3771
rev   line source
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1 /*
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2 * Copyright (c) 2011-2013 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.internal;
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19 import static org.tmatesoft.hg.util.LogFacility.Severity.Error;
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21 import java.io.File;
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22 import java.io.IOException;
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23 import java.nio.charset.Charset;
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24 import java.util.ArrayList;
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25 import java.util.Arrays;
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26 import java.util.Collections;
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27 import java.util.Iterator;
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28 import java.util.LinkedHashSet;
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29 import java.util.List;
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30 import java.util.StringTokenizer;
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31
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32 import org.tmatesoft.hg.core.SessionContext;
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33 import org.tmatesoft.hg.repo.HgDataFile;
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34 import org.tmatesoft.hg.repo.HgInternals;
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35 import org.tmatesoft.hg.repo.HgRepoConfig.ExtensionsSection;
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36 import org.tmatesoft.hg.repo.HgRepository;
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37 import org.tmatesoft.hg.repo.HgRepositoryFiles;
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38 import org.tmatesoft.hg.repo.HgRepositoryLock;
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39 import org.tmatesoft.hg.repo.HgRuntimeException;
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40 import org.tmatesoft.hg.util.PathRewrite;
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41
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42 /**
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43 * Fields/members that shall not be visible
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44 *
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45 * @author Artem Tikhomirov
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46 * @author TMate Software Ltd.
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47 */
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48 public final class Internals implements SessionContext.Source {
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50 /**
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51 * Allows to specify Mercurial installation directory to detect installation-wide configurations.
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52 * Without this property set, hg4j would attempt to deduce this value locating hg executable.
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53 */
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54 public static final String CFG_PROPERTY_HG_INSTALL_ROOT = "hg4j.hg.install_root";
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56 /**
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57 * Tells repository not to cache files/revlogs
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58 * XXX perhaps, need to respect this property not only for data files, but for manifest and changelog as well?
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59 * (@see HgRepository#getChangelog and #getManifest())
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60 */
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61 public static final String CFG_PROPERTY_REVLOG_STREAM_CACHE = "hg4j.repo.disable_revlog_cache";
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63 /**
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64 * Name of charset to use when translating Unicode filenames to Mercurial storage paths, string,
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65 * to resolve with {@link Charset#forName(String)}.
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66 * E.g. <code>"cp1251"</code> or <code>"Latin-1"</code>.
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67 *
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68 * <p>Mercurial uses system encoding when mangling storage paths. Default value
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69 * based on 'file.encoding' Java system property is usually fine here, however
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70 * in certain scenarios it may be desirable to force a different one, and this
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71 * property is exactly for this purpose.
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72 *
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73 * <p>E.g. Eclipse defaults to project encoding (Launch config, Common page) when launching an application,
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74 * and if your project happen to use anything but filesystem default (say, UTF8 on cp1251 system),
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75 * native storage paths won't match
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76 */
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77 public static final String CFG_PROPERTY_FS_FILENAME_ENCODING = "hg.fs.filename.encoding";
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78
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79 /**
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80 * Timeout, in seconds, to acquire filesystem {@link HgRepositoryLock lock}.
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81 *
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82 * Mercurial provides 'ui.timeout' in hgrc (defaults to 600 seconds) to specify how long
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83 * it shall try to acquire a lock for storage or working directory prior to fail.
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84 *
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85 * This configuration property allows to override timeout value from Mercurial's configuration
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86 * file and use Hg4J-specific value instead.
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87 *
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88 * Integer value, use negative for attempts to acquire lock until success, and zero to try once and fail immediately.
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89 */
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90 public static final String CFG_PROPERTY_FS_LOCK_TIMEOUT = "hg4j.fs.lock.timeout";
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92 /**
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93 * Alternative, more effective approach to build revision text from revlog patches - collect all the
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94 * patches one by one, starting at revision next to base, and apply against each other to get
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95 * one final patch, which in turned is applied to base revision.
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96 * <p>
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97 * Original approach is to apply each patch to a previous revision, so that with base revision
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98 * of 1M and three patches, each altering just a tiny fraction
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99 * of the origin, with latter approach we consume 1M (original) + 1M (first patch applied) + 1M (second
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100 * patch applied) + 1M (third patch applied).
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101 * <p>
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102 * Alternative approach, controlled with this option, first combines these there patches into one,
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103 * and only then applies it to base revision, eliminating 2 intermediate elements.
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104 * <p>
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105 * Present default value for this option is <b>FALSE</b>, and will be changed in future, once
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106 * tests prove support is fully functional (likely in v1.2).
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107 *
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108 * @since 1.1
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109 */
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110 public static final String CFG_PROPERTY_PATCH_MERGE = "hg4j.repo.merge_revlog_patches";
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112 public static final int REVLOGV1_RECORD_SIZE = 64;
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113
114
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114 private List<Filter.Factory> filterFactories;
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115 private final HgRepository repo;
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116 private final File repoDir;
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117 private final boolean isCaseSensitiveFileSystem;
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118 private final boolean shallCacheRevlogsInRepo;
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119 private final DataAccessProvider dataAccess;
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120
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121 private final int requiresFlags;
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122
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123 private final PathRewrite dataPathHelper; // access to file storage area (usually under .hg/store/data/), with filenames mangled
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124 private final PathRewrite repoPathHelper; // access to system files (under .hg/store if requires has 'store' flag)
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125
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126 public Internals(HgRepository hgRepo, File hgDir) throws HgRuntimeException {
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127 repo = hgRepo;
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128 repoDir = hgDir;
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129 isCaseSensitiveFileSystem = !runningOnWindows();
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130 SessionContext ctx = repo.getSessionContext();
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131 shallCacheRevlogsInRepo = new PropertyMarshal(ctx).getBoolean(CFG_PROPERTY_REVLOG_STREAM_CACHE, true);
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132 dataAccess = new DataAccessProvider(ctx);
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133 RepoInitializer repoInit = new RepoInitializer().initRequiresFromFile(repoDir);
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134 requiresFlags = repoInit.getRequires();
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135 dataPathHelper = repoInit.buildDataFilesHelper(getSessionContext());
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136 repoPathHelper = repoInit.buildStoreFilesHelper();
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137 }
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138
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139 public boolean isInvalid() {
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140 return !repoDir.exists() || !repoDir.isDirectory();
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141 }
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142
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143 public File getRepositoryFile(HgRepositoryFiles f) {
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144 return f.residesUnderRepositoryRoot() ? getFileFromRepoDir(f.getName()) : getFileFromDataDir(f.getName());
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145 }
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146
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147 /**
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148 * Access files under ".hg/".
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149 * File not necessarily exists, this method is merely a factory for Files at specific, configuration-dependent location.
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150 *
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151 * @param name shall be normalized path
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152 */
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153 public File getFileFromRepoDir(String name) {
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154 return new File(repoDir, name);
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155 }
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156
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157 /**
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158 * Access files under ".hg/store/" or ".hg/" depending on use of 'store' in requires.
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159 * File not necessarily exists, this method is merely a factory for Files at specific, configuration-dependent location.
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160 *
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161 * @param name shall be normalized path
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162 */
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163 public File getFileFromStoreDir(String name) {
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164 CharSequence location = repoPathHelper.rewrite(name);
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165 return new File(repoDir, location.toString());
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166 }
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167
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168 /**
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169 * Access files under ".hg/store/data", ".hg/store/dh/" or ".hg/data" according to settings in requires file.
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170 * File not necessarily exists, this method is merely a factory for Files at specific, configuration-dependent location.
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171 *
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172 * @param name shall be normalized path, without .i or .d suffixes
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173 */
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174 public File getFileFromDataDir(CharSequence path) {
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175 CharSequence storagePath = dataPathHelper.rewrite(path);
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176 return new File(repoDir, storagePath.toString());
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177 }
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178
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179 public SessionContext getSessionContext() {
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180 return repo.getSessionContext();
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181 }
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182
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183 public HgRepository getRepo() {
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184 return repo;
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185 }
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186
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187 public DataAccessProvider getDataAccess() {
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188 return dataAccess;
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189 }
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190
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191 public PathRewrite buildNormalizePathRewrite() {
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192 if (runningOnWindows()) {
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193 return new WinToNixPathRewrite();
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194 } else {
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195 return new PathRewrite.Empty(); // or strip leading slash, perhaps?
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196 }
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197 }
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198
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199 public List<Filter.Factory> getFilters() {
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200 if (filterFactories == null) {
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201 filterFactories = new ArrayList<Filter.Factory>();
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202 ExtensionsSection cfg = repo.getConfiguration().getExtensions();
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203 if (cfg.isEnabled("eol")) {
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204 NewlineFilter.Factory ff = new NewlineFilter.Factory();
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205 ff.initialize(repo);
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206 filterFactories.add(ff);
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207 }
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208 if (cfg.isEnabled("keyword")) {
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209 KeywordFilter.Factory ff = new KeywordFilter.Factory();
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210 ff.initialize(repo);
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211 filterFactories.add(ff);
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212 }
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213 }
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214 return filterFactories;
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215 }
202
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216
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217 public boolean isCaseSensitiveFileSystem() {
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218 return isCaseSensitiveFileSystem;
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219 }
412
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220
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221 public EncodingHelper buildFileNameEncodingHelper() {
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222 return new EncodingHelper(getFilenameEncoding(), repo.getSessionContext());
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223 }
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224
559
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225 public boolean fncacheInUse() {
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226 return (getRequiresFlags() & RequiresFile.FNCACHE) != 0;
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227 }
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228
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229 /*package-local*/ Charset getFilenameEncoding() {
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230 return getFileEncoding(getSessionContext());
412
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231 }
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232
490
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233 /*package-local*/ static Charset getFileEncoding(SessionContext ctx) {
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234 Object altEncoding = ctx.getConfigurationProperty(CFG_PROPERTY_FS_FILENAME_ENCODING, null);
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235 Charset cs;
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236 if (altEncoding == null) {
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237 cs = Charset.defaultCharset();
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238 } else {
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239 try {
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240 cs = Charset.forName(altEncoding.toString());
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241 } catch (IllegalArgumentException ex) {
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242 // both IllegalCharsetNameException and UnsupportedCharsetException are subclasses of IAE, too
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243 // not severe enough to throw an exception, imo. Just record the fact it's bad ad we ignore it
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244 ctx.getLog().dump(Internals.class, Error, ex, String.format("Bad configuration value for filename encoding %s", altEncoding));
412
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245 cs = Charset.defaultCharset();
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246 }
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247 }
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248 return cs;
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249 }
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250
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251 /**
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252 * Access to mangled name of a file in repository storage, may come handy for debug.
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253 * @return mangled path of the repository file
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254 */
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255 public CharSequence getStoragePath(HgDataFile df) {
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256 return dataPathHelper.rewrite(df.getPath().toString());
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257 }
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258
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259 public int getRequiresFlags() {
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260 return requiresFlags;
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261 }
526
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262
292
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263 public static boolean runningOnWindows() {
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264 return System.getProperty("os.name").indexOf("Windows") != -1;
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265 }
379
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266
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267 /**
419
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268 * @param fsHint optional hint pointing to filesystem of interest (generally, it's possible to mount
413
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269 * filesystems with different capabilities and repository's capabilities would depend on which fs it resides)
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270 * @return <code>true</code> if executable files deserve tailored handling
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271 */
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272 public static boolean checkSupportsExecutables(File fsHint) {
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273 // *.exe are not executables for Mercurial
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274 return !runningOnWindows();
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275 }
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276
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277 /**
419
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278 * @param fsHint optional hint pointing to filesystem of interest (generally, it's possible to mount
413
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279 * filesystems with different capabilities and repository's capabilities would depend on which fs it resides)
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280 * @return <code>true</code> if filesystem knows what symbolic links are
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281 */
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282 public static boolean checkSupportsSymlinks(File fsHint) {
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283 // Windows supports soft symbolic links starting from Vista
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284 // However, as of Mercurial 2.1.1, no support for this functionality
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285 // XXX perhaps, makes sense to override with a property a) to speed up when no links are in use b) investigate how this runs windows
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286 return !runningOnWindows();
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287 }
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288
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289
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290 /**
379
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291 * For Unix, returns installation root, which is the parent directory of the hg executable (or symlink) being run.
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292 * For Windows, it's Mercurial installation directory itself
382
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293 * @param ctx
379
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294 */
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295 private static File findHgInstallRoot(SessionContext ctx) {
379
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296 // let clients to override Hg install location
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297 String p = (String) ctx.getConfigurationProperty(CFG_PROPERTY_HG_INSTALL_ROOT, null);
379
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298 if (p != null) {
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299 return new File(p);
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300 }
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301 StringTokenizer st = new StringTokenizer(System.getenv("PATH"), System.getProperty("path.separator"), false);
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302 final boolean runsOnWin = runningOnWindows();
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303 while (st.hasMoreTokens()) {
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304 String pe = st.nextToken();
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305 File execCandidate = new File(pe, runsOnWin ? "hg.exe" : "hg");
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306 if (execCandidate.exists() && execCandidate.isFile()) {
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307 File execDir = execCandidate.getParentFile();
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308 // e.g. on Unix runs "/shared/tools/bin/hg", directory of interest is "/shared/tools/"
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309 return runsOnWin ? execDir : execDir.getParentFile();
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310 }
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311 }
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312 return null;
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313 }
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314
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315 /**
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316 * User-specific configuration, from system-wide and user home locations, without any repository-specific data.
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317 *
379
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318 * @see http://www.selenic.com/mercurial/hgrc.5.html
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319 */
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320 public static ConfigFile readConfiguration(SessionContext sessionCtx) throws IOException {
483
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321 ConfigFile configFile = new ConfigFile(sessionCtx);
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322 File hgInstallRoot = findHgInstallRoot(sessionCtx); // may be null
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323 //
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324 if (runningOnWindows()) {
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325 if (hgInstallRoot != null) {
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326 for (File f : getWindowsConfigFilesPerInstall(hgInstallRoot)) {
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327 configFile.addLocation(f);
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328 }
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329 }
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330 LinkedHashSet<String> locations = new LinkedHashSet<String>();
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331 locations.add(System.getenv("USERPROFILE"));
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332 locations.add(System.getenv("HOME"));
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333 locations.remove(null);
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334 for (String loc : locations) {
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335 File location = new File(loc);
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336 configFile.addLocation(new File(location, "Mercurial.ini"));
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337 configFile.addLocation(new File(location, ".hgrc"));
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338 }
351
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339 } else {
379
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340 if (hgInstallRoot != null) {
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341 File d = new File(hgInstallRoot, "etc/mercurial/hgrc.d/");
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342 if (d.isDirectory() && d.canRead()) {
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343 for (File f : listConfigFiles(d)) {
351
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344 configFile.addLocation(f);
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345 }
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346 }
379
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347 configFile.addLocation(new File(hgInstallRoot, "etc/mercurial/hgrc"));
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348 }
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349 // same, but with absolute paths
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350 File d = new File("/etc/mercurial/hgrc.d/");
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351 if (d.isDirectory() && d.canRead()) {
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352 for (File f : listConfigFiles(d)) {
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353 configFile.addLocation(f);
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354 }
351
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355 }
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356 configFile.addLocation(new File("/etc/mercurial/hgrc"));
379
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357 configFile.addLocation(new File(System.getenv("HOME"), ".hgrc"));
351
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358 }
579
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359 return configFile;
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360 }
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361
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362 /**
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363 * Repository-specific configuration
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364 * @see http://www.selenic.com/mercurial/hgrc.5.html
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365 */
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366 public ConfigFile readConfiguration() throws IOException {
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367 ConfigFile configFile = readConfiguration(repo.getSessionContext());
331
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368 // last one, overrides anything else
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369 // <repo>/.hg/hgrc
490
b3c16d1aede0 Refactoring: move HgRepository's implementation aspects to Internals (which is now its imlementation counterpart and primary repository class to be used by other parts of the library)
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370 configFile.addLocation(getFileFromRepoDir("hgrc"));
331
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371 return configFile;
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372 }
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373
379
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374
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375 private static List<File> getWindowsConfigFilesPerInstall(File hgInstallDir) {
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376 File f = new File(hgInstallDir, "Mercurial.ini");
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377 if (f.exists()) {
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378 return Collections.singletonList(f);
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379 }
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380 f = new File(hgInstallDir, "hgrc.d/");
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381 if (f.canRead() && f.isDirectory()) {
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382 return listConfigFiles(f);
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383 }
418
528b6780a8bd A bit of FIXME cleanup (mostly degraded to TODO post 1.0), comments and javadoc
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384 // TODO post-1.0 query registry, e.g. with
379
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385 // Runtime.exec("reg query HKLM\Software\Mercurial")
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386 //
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387 f = new File("C:\\Mercurial\\Mercurial.ini");
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388 if (f.exists()) {
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389 return Collections.singletonList(f);
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390 }
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391 return Collections.emptyList();
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392 }
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393
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394 private static List<File> listConfigFiles(File dir) {
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395 assert dir.canRead();
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396 assert dir.isDirectory();
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397 final File[] allFiles = dir.listFiles();
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398 // File is Comparable, lexicographically by default
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399 Arrays.sort(allFiles);
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400 ArrayList<File> rv = new ArrayList<File>(allFiles.length);
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401 for (File f : allFiles) {
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402 if (f.getName().endsWith(".rc")) {
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403 rv.add(f);
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404 }
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405 }
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406 return rv;
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407 }
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diff changeset
408
382
82336b7c54f4 Per-repository UpdateConfigCommand completed. Access to system properties through SessionContext to ease alternation
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409 public static File getInstallationConfigurationFileToWrite(SessionContext ctx) {
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410 File hgInstallRoot = findHgInstallRoot(ctx); // may be null
379
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411 // choice of which hgrc to pick here is according to my own pure discretion
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412 if (hgInstallRoot != null) {
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413 // use this location only if it's writable
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414 File cfg = new File(hgInstallRoot, runningOnWindows() ? "Mercurial.ini" : "etc/mercurial/hgrc");
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415 if (cfg.canWrite() || cfg.getParentFile().canWrite()) {
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416 return cfg;
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417 }
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diff changeset
418 }
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diff changeset
419 // fallback
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diff changeset
420 if (runningOnWindows()) {
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diff changeset
421 if (hgInstallRoot == null) {
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422 return new File("C:\\Mercurial\\Mercurial.ini");
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423 } else {
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424 // yes, we tried this file already (above) and found it non-writable
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diff changeset
425 // let caller fail with can't write
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426 return new File(hgInstallRoot, "Mercurial.ini");
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diff changeset
427 }
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428 } else {
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429 return new File("/etc/mercurial/hgrc");
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diff changeset
430 }
378
9fb990c8a724 Investigate approaches to alter Mercurial configuration files
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parents: 351
diff changeset
431 }
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diff changeset
432
382
82336b7c54f4 Per-repository UpdateConfigCommand completed. Access to system properties through SessionContext to ease alternation
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diff changeset
433 public static File getUserConfigurationFileToWrite(SessionContext ctx) {
379
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diff changeset
434 LinkedHashSet<String> locations = new LinkedHashSet<String>();
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diff changeset
435 final boolean runsOnWindows = runningOnWindows();
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diff changeset
436 if (runsOnWindows) {
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diff changeset
437 locations.add(System.getenv("USERPROFILE"));
378
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diff changeset
438 }
379
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diff changeset
439 locations.add(System.getenv("HOME"));
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440 locations.remove(null);
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diff changeset
441 for (String loc : locations) {
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diff changeset
442 File location = new File(loc);
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443 File rv = new File(location, ".hgrc");
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444 if (rv.exists() && rv.canWrite()) {
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445 return rv;
fa2be7a05af6 Implement discovery of mercurial installation, use it to read/write configuration files
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446 }
fa2be7a05af6 Implement discovery of mercurial installation, use it to read/write configuration files
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parents: 378
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447 if (runsOnWindows) {
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448 rv = new File(location, "Mercurial.ini");
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449 if (rv.exists() && rv.canWrite()) {
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450 return rv;
fa2be7a05af6 Implement discovery of mercurial installation, use it to read/write configuration files
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parents: 378
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451 }
378
9fb990c8a724 Investigate approaches to alter Mercurial configuration files
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parents: 351
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452 }
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453 }
379
fa2be7a05af6 Implement discovery of mercurial installation, use it to read/write configuration files
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454 // fallback to default, let calling code fail with Exception if can't write
fa2be7a05af6 Implement discovery of mercurial installation, use it to read/write configuration files
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455 return new File(System.getProperty("user.home"), ".hgrc");
378
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parents: 351
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456 }
388
b015f3918120 Work on FIXME: correct HgDataFile#workingCopy with tests; BasicSessionContext with property override; platform-specific options to internals
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 382
diff changeset
457
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458 public boolean shallCacheRevlogs() {
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459 return shallCacheRevlogsInRepo;
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460 }
407
30922c728341 Better multiline log printout; options to tune default log output
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parents: 388
diff changeset
461
526
2f9ed6bcefa2 Initial support for Revert command with accompanying minor refactoring
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462 // marker method
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463 public static IllegalStateException notImplemented() {
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464 return new IllegalStateException("Not implemented");
2f9ed6bcefa2 Initial support for Revert command with accompanying minor refactoring
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parents: 525
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465 }
2f9ed6bcefa2 Initial support for Revert command with accompanying minor refactoring
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 525
diff changeset
466
525
0be5be8d57e9 Repository checkout support, first iteration
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parents: 504
diff changeset
467 public static Internals getInstance(HgRepository repo) {
0be5be8d57e9 Repository checkout support, first iteration
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parents: 504
diff changeset
468 return HgInternals.getImplementationRepo(repo);
0be5be8d57e9 Repository checkout support, first iteration
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 504
diff changeset
469 }
0be5be8d57e9 Repository checkout support, first iteration
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 504
diff changeset
470
407
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diff changeset
471 public static <T> CharSequence join(Iterable<T> col, CharSequence separator) {
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diff changeset
472 if (col == null) {
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473 return String.valueOf(col);
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474 }
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diff changeset
475 Iterator<T> it = col.iterator();
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diff changeset
476 if (!it.hasNext()) {
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diff changeset
477 return "[]";
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478 }
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diff changeset
479 String v = String.valueOf(it.next());
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480 StringBuilder sb = new StringBuilder(v);
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 388
diff changeset
481 while (it.hasNext()) {
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 388
diff changeset
482 sb.append(separator);
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parents: 388
diff changeset
483 v = String.valueOf(it.next());
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parents: 388
diff changeset
484 sb.append(v);
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 388
diff changeset
485 }
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 388
diff changeset
486 return sb;
30922c728341 Better multiline log printout; options to tune default log output
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parents: 388
diff changeset
487 }
420
6c22bdc0bdfd Respect long offsets in revlogs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 419
diff changeset
488
6c22bdc0bdfd Respect long offsets in revlogs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 419
diff changeset
489 /**
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parents: 419
diff changeset
490 * keep an eye on all long to int downcasts to get a chance notice the lost of data
6c22bdc0bdfd Respect long offsets in revlogs
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parents: 419
diff changeset
491 * Use if there's even subtle chance there might be loss
6c22bdc0bdfd Respect long offsets in revlogs
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parents: 419
diff changeset
492 * (ok not to use if there's no way for l to be greater than int)
6c22bdc0bdfd Respect long offsets in revlogs
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parents: 419
diff changeset
493 */
6c22bdc0bdfd Respect long offsets in revlogs
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parents: 419
diff changeset
494 public static int ltoi(long l) {
6c22bdc0bdfd Respect long offsets in revlogs
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parents: 419
diff changeset
495 int i = (int) l;
6c22bdc0bdfd Respect long offsets in revlogs
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diff changeset
496 assert ((long) i) == l : "Loss of data!";
6c22bdc0bdfd Respect long offsets in revlogs
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parents: 419
diff changeset
497 return i;
6c22bdc0bdfd Respect long offsets in revlogs
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parents: 419
diff changeset
498 }
74
6f1b88693d48 Complete refactoring to org.tmatesoft
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
499 }