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annotate src/org/tmatesoft/hg/internal/Internals.java @ 525:0be5be8d57e9

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Repository checkout support, first iteration
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 11 Jan 2013 18:12:39 +0100
parents bf352ce2b97f
children 2f9ed6bcefa2
rev   line source
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1 /*
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2 * Copyright (c) 2011-2012 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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18
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19 import static org.tmatesoft.hg.util.LogFacility.Severity.Error;
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20
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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.HgRuntimeException;
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36 import org.tmatesoft.hg.repo.HgRepoConfig.ExtensionsSection;
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37 import org.tmatesoft.hg.repo.HgRepository;
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38 import org.tmatesoft.hg.util.PathRewrite;
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40 /**
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41 * Fields/members that shall not be visible
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42 *
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43 * @author Artem Tikhomirov
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44 * @author TMate Software Ltd.
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45 */
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46 public final class Internals implements SessionContext.Source {
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48 /**
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49 * Allows to specify Mercurial installation directory to detect installation-wide configurations.
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50 * Without this property set, hg4j would attempt to deduce this value locating hg executable.
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51 */
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52 public static final String CFG_PROPERTY_HG_INSTALL_ROOT = "hg4j.hg.install_root";
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54 /**
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55 * Tells repository not to cache files/revlogs
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56 * XXX perhaps, need to respect this property not only for data files, but for manifest and changelog as well?
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57 * (@see HgRepository#getChangelog and #getManifest())
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58 */
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59 public static final String CFG_PROPERTY_REVLOG_STREAM_CACHE = "hg4j.repo.disable_revlog_cache";
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61 /**
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62 * Name of charset to use when translating Unicode filenames to Mercurial storage paths, string,
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63 * to resolve with {@link Charset#forName(String)}.
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64 * E.g. <code>"cp1251"</code> or <code>"Latin-1"</code>.
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65 *
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66 * <p>Mercurial uses system encoding when mangling storage paths. Default value
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67 * based on 'file.encoding' Java system property is usually fine here, however
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68 * in certain scenarios it may be desirable to force a different one, and this
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69 * property is exactly for this purpose.
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70 *
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71 * <p>E.g. Eclipse defaults to project encoding (Launch config, Common page) when launching an application,
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72 * and if your project happen to use anything but filesystem default (say, UTF8 on cp1251 system),
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73 * native storage paths won't match
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74 */
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75 public static final String CFG_PROPERTY_FS_FILENAME_ENCODING = "hg.fs.filename.encoding";
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77 /**
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78 * Timeout, in seconds, to acquire filesystem {@link HgRepositoryLock lock}.
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79 *
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80 * Mercurial provides 'ui.timeout' in hgrc (defaults to 600 seconds) to specify how long
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81 * it shall try to acquire a lock for storage or working directory prior to fail.
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82 *
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83 * This configuration property allows to override timeout value from Mercurial's configuration
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84 * file and use Hg4J-specific value instead.
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85 *
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86 * Integer value, use negative for attempts to acquire lock until success, and zero to try once and fail immediately.
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87 */
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88 public static final String CFG_PROPERTY_FS_LOCK_TIMEOUT = "hg4j.fs.lock.timeout";
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90 private List<Filter.Factory> filterFactories;
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91 private final HgRepository repo;
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92 private final File repoDir;
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93 private final boolean isCaseSensitiveFileSystem;
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94 private final boolean shallCacheRevlogsInRepo;
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95 private final DataAccessProvider dataAccess;
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97 @SuppressWarnings("unused")
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98 private final int requiresFlags;
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100 private final PathRewrite dataPathHelper; // access to file storage area (usually under .hg/store/data/), with filenames mangled
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101 private final PathRewrite repoPathHelper; // access to system files (under .hg/store if requires has 'store' flag)
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103 public Internals(HgRepository hgRepo, File hgDir) throws HgRuntimeException {
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104 repo = hgRepo;
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105 repoDir = hgDir;
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106 isCaseSensitiveFileSystem = !runningOnWindows();
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107 SessionContext ctx = repo.getSessionContext();
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108 shallCacheRevlogsInRepo = new PropertyMarshal(ctx).getBoolean(CFG_PROPERTY_REVLOG_STREAM_CACHE, true);
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109 dataAccess = new DataAccessProvider(ctx);
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110 RepoInitializer repoInit = new RepoInitializer().initRequiresFromFile(repoDir);
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111 requiresFlags = repoInit.getRequires();
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112 dataPathHelper = repoInit.buildDataFilesHelper(getSessionContext());
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113 repoPathHelper = repoInit.buildStoreFilesHelper();
114
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114 }
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115
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116 public boolean isInvalid() {
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117 return !repoDir.exists() || !repoDir.isDirectory();
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118 }
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119
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120 /**
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121 * Access files under ".hg/".
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122 * File not necessarily exists, this method is merely a factory for Files at specific, configuration-dependent location.
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123 *
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124 * @param name shall be normalized path
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125 */
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126 public File getFileFromRepoDir(String name) {
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127 return new File(repoDir, name);
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128 }
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129
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130 /**
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131 * Access files under ".hg/store/" or ".hg/" depending on use of 'store' in requires.
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132 * File not necessarily exists, this method is merely a factory for Files at specific, configuration-dependent location.
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133 *
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134 * @param name shall be normalized path
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135 */
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136 public File getFileFromStoreDir(String name) {
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137 CharSequence location = repoPathHelper.rewrite(name);
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138 return new File(repoDir, location.toString());
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139 }
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140
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141 /**
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142 * Access files under ".hg/store/data", ".hg/store/dh/" or ".hg/data" according to settings in requires file.
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143 * File not necessarily exists, this method is merely a factory for Files at specific, configuration-dependent location.
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144 *
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145 * @param name shall be normalized path, without .i or .d suffixes
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146 */
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147 public File getFileFromDataDir(CharSequence path) {
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148 CharSequence storagePath = dataPathHelper.rewrite(path);
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149 return new File(repoDir, storagePath.toString());
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150 }
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151
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152 public SessionContext getSessionContext() {
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153 return repo.getSessionContext();
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154 }
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155
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156 public HgRepository getRepo() {
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157 return repo;
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158 }
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159
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160 public DataAccessProvider getDataAccess() {
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161 return dataAccess;
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162 }
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163
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164 public PathRewrite buildNormalizePathRewrite() {
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165 if (runningOnWindows()) {
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166 return new WinToNixPathRewrite();
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167 } else {
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168 return new PathRewrite.Empty(); // or strip leading slash, perhaps?
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169 }
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170 }
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171
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172 public List<Filter.Factory> getFilters() {
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173 if (filterFactories == null) {
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174 filterFactories = new ArrayList<Filter.Factory>();
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175 ExtensionsSection cfg = repo.getConfiguration().getExtensions();
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176 if (cfg.isEnabled("eol")) {
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177 NewlineFilter.Factory ff = new NewlineFilter.Factory();
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178 ff.initialize(repo);
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179 filterFactories.add(ff);
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180 }
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181 if (cfg.isEnabled("keyword")) {
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182 KeywordFilter.Factory ff = new KeywordFilter.Factory();
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183 ff.initialize(repo);
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184 filterFactories.add(ff);
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185 }
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186 }
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187 return filterFactories;
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188 }
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189
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190 public boolean isCaseSensitiveFileSystem() {
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191 return isCaseSensitiveFileSystem;
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192 }
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193
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194 public EncodingHelper buildFileNameEncodingHelper() {
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195 SessionContext ctx = repo.getSessionContext();
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196 return new EncodingHelper(getFileEncoding(ctx), ctx);
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197 }
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198
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199 /*package-local*/ static Charset getFileEncoding(SessionContext ctx) {
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200 Object altEncoding = ctx.getConfigurationProperty(CFG_PROPERTY_FS_FILENAME_ENCODING, null);
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201 Charset cs;
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202 if (altEncoding == null) {
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203 cs = Charset.defaultCharset();
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204 } else {
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205 try {
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206 cs = Charset.forName(altEncoding.toString());
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207 } catch (IllegalArgumentException ex) {
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208 // both IllegalCharsetNameException and UnsupportedCharsetException are subclasses of IAE, too
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209 // not severe enough to throw an exception, imo. Just record the fact it's bad ad we ignore it
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210 ctx.getLog().dump(Internals.class, Error, ex, String.format("Bad configuration value for filename encoding %s", altEncoding));
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211 cs = Charset.defaultCharset();
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212 }
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213 }
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214 return cs;
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215 }
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216
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217 /**
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218 * Access to mangled name of a file in repository storage, may come handy for debug.
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219 * @return mangled path of the repository file
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220 */
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221 public CharSequence getStoragePath(HgDataFile df) {
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222 return dataPathHelper.rewrite(df.getPath().toString());
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223 }
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224
202
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225
292
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226 public static boolean runningOnWindows() {
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227 return System.getProperty("os.name").indexOf("Windows") != -1;
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228 }
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229
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230 /**
419
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231 * @param fsHint optional hint pointing to filesystem of interest (generally, it's possible to mount
413
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232 * filesystems with different capabilities and repository's capabilities would depend on which fs it resides)
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233 * @return <code>true</code> if executable files deserve tailored handling
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234 */
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235 public static boolean checkSupportsExecutables(File fsHint) {
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236 // *.exe are not executables for Mercurial
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237 return !runningOnWindows();
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238 }
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239
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240 /**
419
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241 * @param fsHint optional hint pointing to filesystem of interest (generally, it's possible to mount
413
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242 * filesystems with different capabilities and repository's capabilities would depend on which fs it resides)
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243 * @return <code>true</code> if filesystem knows what symbolic links are
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244 */
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245 public static boolean checkSupportsSymlinks(File fsHint) {
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246 // Windows supports soft symbolic links starting from Vista
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247 // However, as of Mercurial 2.1.1, no support for this functionality
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248 // 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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249 return !runningOnWindows();
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250 }
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251
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252
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253 /**
379
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254 * For Unix, returns installation root, which is the parent directory of the hg executable (or symlink) being run.
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255 * For Windows, it's Mercurial installation directory itself
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256 * @param ctx
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257 */
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258 private static File findHgInstallRoot(SessionContext ctx) {
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259 // let clients to override Hg install location
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260 String p = (String) ctx.getConfigurationProperty(CFG_PROPERTY_HG_INSTALL_ROOT, null);
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261 if (p != null) {
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262 return new File(p);
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263 }
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264 StringTokenizer st = new StringTokenizer(System.getenv("PATH"), System.getProperty("path.separator"), false);
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265 final boolean runsOnWin = runningOnWindows();
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266 while (st.hasMoreTokens()) {
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267 String pe = st.nextToken();
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268 File execCandidate = new File(pe, runsOnWin ? "hg.exe" : "hg");
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269 if (execCandidate.exists() && execCandidate.isFile()) {
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270 File execDir = execCandidate.getParentFile();
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271 // e.g. on Unix runs "/shared/tools/bin/hg", directory of interest is "/shared/tools/"
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272 return runsOnWin ? execDir : execDir.getParentFile();
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273 }
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274 }
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275 return null;
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276 }
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277
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278 /**
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279 * @see http://www.selenic.com/mercurial/hgrc.5.html
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280 */
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281 public ConfigFile readConfiguration() throws IOException {
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282 SessionContext sessionCtx = repo.getSessionContext();
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283 ConfigFile configFile = new ConfigFile(sessionCtx);
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284 File hgInstallRoot = findHgInstallRoot(sessionCtx); // may be null
379
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285 //
351
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286 if (runningOnWindows()) {
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287 if (hgInstallRoot != null) {
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288 for (File f : getWindowsConfigFilesPerInstall(hgInstallRoot)) {
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289 configFile.addLocation(f);
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290 }
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291 }
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292 LinkedHashSet<String> locations = new LinkedHashSet<String>();
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293 locations.add(System.getenv("USERPROFILE"));
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294 locations.add(System.getenv("HOME"));
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295 locations.remove(null);
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296 for (String loc : locations) {
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297 File location = new File(loc);
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298 configFile.addLocation(new File(location, "Mercurial.ini"));
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299 configFile.addLocation(new File(location, ".hgrc"));
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300 }
351
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301 } else {
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302 if (hgInstallRoot != null) {
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303 File d = new File(hgInstallRoot, "etc/mercurial/hgrc.d/");
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304 if (d.isDirectory() && d.canRead()) {
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305 for (File f : listConfigFiles(d)) {
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306 configFile.addLocation(f);
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307 }
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308 }
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309 configFile.addLocation(new File(hgInstallRoot, "etc/mercurial/hgrc"));
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310 }
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311 // same, but with absolute paths
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312 File d = new File("/etc/mercurial/hgrc.d/");
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313 if (d.isDirectory() && d.canRead()) {
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314 for (File f : listConfigFiles(d)) {
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315 configFile.addLocation(f);
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316 }
351
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317 }
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318 configFile.addLocation(new File("/etc/mercurial/hgrc"));
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319 configFile.addLocation(new File(System.getenv("HOME"), ".hgrc"));
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320 }
331
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321 // last one, overrides anything else
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322 // <repo>/.hg/hgrc
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323 configFile.addLocation(getFileFromRepoDir("hgrc"));
331
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324 return configFile;
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325 }
379
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326
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327 private static List<File> getWindowsConfigFilesPerInstall(File hgInstallDir) {
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328 File f = new File(hgInstallDir, "Mercurial.ini");
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329 if (f.exists()) {
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330 return Collections.singletonList(f);
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331 }
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332 f = new File(hgInstallDir, "hgrc.d/");
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333 if (f.canRead() && f.isDirectory()) {
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334 return listConfigFiles(f);
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335 }
418
528b6780a8bd A bit of FIXME cleanup (mostly degraded to TODO post 1.0), comments and javadoc
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336 // TODO post-1.0 query registry, e.g. with
379
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337 // Runtime.exec("reg query HKLM\Software\Mercurial")
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338 //
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339 f = new File("C:\\Mercurial\\Mercurial.ini");
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340 if (f.exists()) {
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341 return Collections.singletonList(f);
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342 }
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343 return Collections.emptyList();
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344 }
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345
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346 private static List<File> listConfigFiles(File dir) {
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347 assert dir.canRead();
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348 assert dir.isDirectory();
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349 final File[] allFiles = dir.listFiles();
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350 // File is Comparable, lexicographically by default
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351 Arrays.sort(allFiles);
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352 ArrayList<File> rv = new ArrayList<File>(allFiles.length);
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353 for (File f : allFiles) {
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354 if (f.getName().endsWith(".rc")) {
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355 rv.add(f);
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356 }
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357 }
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358 return rv;
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359 }
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360
382
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361 public static File getInstallationConfigurationFileToWrite(SessionContext ctx) {
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362 File hgInstallRoot = findHgInstallRoot(ctx); // may be null
379
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363 // choice of which hgrc to pick here is according to my own pure discretion
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364 if (hgInstallRoot != null) {
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365 // use this location only if it's writable
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366 File cfg = new File(hgInstallRoot, runningOnWindows() ? "Mercurial.ini" : "etc/mercurial/hgrc");
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367 if (cfg.canWrite() || cfg.getParentFile().canWrite()) {
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368 return cfg;
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369 }
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370 }
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371 // fallback
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372 if (runningOnWindows()) {
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373 if (hgInstallRoot == null) {
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374 return new File("C:\\Mercurial\\Mercurial.ini");
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375 } else {
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376 // yes, we tried this file already (above) and found it non-writable
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377 // let caller fail with can't write
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378 return new File(hgInstallRoot, "Mercurial.ini");
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379 }
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380 } else {
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381 return new File("/etc/mercurial/hgrc");
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382 }
378
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383 }
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384
382
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385 public static File getUserConfigurationFileToWrite(SessionContext ctx) {
379
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386 LinkedHashSet<String> locations = new LinkedHashSet<String>();
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387 final boolean runsOnWindows = runningOnWindows();
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388 if (runsOnWindows) {
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389 locations.add(System.getenv("USERPROFILE"));
378
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390 }
379
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391 locations.add(System.getenv("HOME"));
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392 locations.remove(null);
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393 for (String loc : locations) {
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394 File location = new File(loc);
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395 File rv = new File(location, ".hgrc");
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396 if (rv.exists() && rv.canWrite()) {
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397 return rv;
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398 }
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399 if (runsOnWindows) {
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400 rv = new File(location, "Mercurial.ini");
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401 if (rv.exists() && rv.canWrite()) {
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402 return rv;
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403 }
378
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diff changeset
404 }
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405 }
379
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406 // fallback to default, let calling code fail with Exception if can't write
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diff changeset
407 return new File(System.getProperty("user.home"), ".hgrc");
378
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diff changeset
408 }
388
b015f3918120 Work on FIXME: correct HgDataFile#workingCopy with tests; BasicSessionContext with property override; platform-specific options to internals
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parents: 382
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409
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parents: 382
diff changeset
410 public boolean shallCacheRevlogs() {
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411 return shallCacheRevlogsInRepo;
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412 }
407
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diff changeset
413
525
0be5be8d57e9 Repository checkout support, first iteration
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414 public static Internals getInstance(HgRepository repo) {
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diff changeset
415 return HgInternals.getImplementationRepo(repo);
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416 }
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417
407
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diff changeset
418 public static <T> CharSequence join(Iterable<T> col, CharSequence separator) {
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diff changeset
419 if (col == null) {
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diff changeset
420 return String.valueOf(col);
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diff changeset
421 }
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diff changeset
422 Iterator<T> it = col.iterator();
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diff changeset
423 if (!it.hasNext()) {
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diff changeset
424 return "[]";
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parents: 388
diff changeset
425 }
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diff changeset
426 String v = String.valueOf(it.next());
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diff changeset
427 StringBuilder sb = new StringBuilder(v);
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diff changeset
428 while (it.hasNext()) {
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diff changeset
429 sb.append(separator);
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diff changeset
430 v = String.valueOf(it.next());
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431 sb.append(v);
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432 }
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433 return sb;
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diff changeset
434 }
420
6c22bdc0bdfd Respect long offsets in revlogs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 419
diff changeset
435
6c22bdc0bdfd Respect long offsets in revlogs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 419
diff changeset
436 /**
6c22bdc0bdfd Respect long offsets in revlogs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 419
diff changeset
437 * keep an eye on all long to int downcasts to get a chance notice the lost of data
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parents: 419
diff changeset
438 * 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
439 * (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
440 */
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parents: 419
diff changeset
441 public static int ltoi(long l) {
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442 int i = (int) l;
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443 assert ((long) i) == l : "Loss of data!";
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444 return i;
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445 }
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446 }