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annotate src/org/tmatesoft/hg/internal/Internals.java @ 497:02140be396d5

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Issue 38. Towards gentle handling of config files - parse them and keep every possible user change
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 25 Oct 2012 19:59:08 +0200
parents ba36f66c32b4
children d2f6ab541330
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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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.HgRuntimeException;
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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.util.PathRewrite;
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39 /**
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40 * Fields/members that shall not be visible
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41 *
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42 * @author Artem Tikhomirov
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43 * @author TMate Software Ltd.
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44 */
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45 public final class Internals {
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46
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47 /**
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48 * Allows to specify Mercurial installation directory to detect installation-wide configurations.
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49 * Without this property set, hg4j would attempt to deduce this value locating hg executable.
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50 */
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51 public static final String CFG_PROPERTY_HG_INSTALL_ROOT = "hg4j.hg.install_root";
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53 /**
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54 * Tells repository not to cache files/revlogs
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55 * XXX perhaps, need to respect this property not only for data files, but for manifest and changelog as well?
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56 * (@see HgRepository#getChangelog and #getManifest())
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57 */
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58 public static final String CFG_PROPERTY_REVLOG_STREAM_CACHE = "hg4j.repo.disable_revlog_cache";
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59
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60 /**
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61 * Name of charset to use when translating Unicode filenames to Mercurial storage paths, string,
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62 * to resolve with {@link Charset#forName(String)}.
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63 * E.g. <code>"cp1251"</code> or <code>"Latin-1"</code>.
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64 *
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65 * <p>Mercurial uses system encoding when mangling storage paths. Default value
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66 * based on 'file.encoding' Java system property is usually fine here, however
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67 * in certain scenarios it may be desirable to force a different one, and this
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68 * property is exactly for this purpose.
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69 *
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70 * <p>E.g. Eclipse defaults to project encoding (Launch config, Common page) when launching an application,
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71 * and if your project happen to use anything but filesystem default (say, UTF8 on cp1251 system),
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72 * native storage paths won't match
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73 */
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74 public static final String CFG_PROPERTY_FS_FILENAME_ENCODING = "hg.fs.filename.encoding";
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76 private List<Filter.Factory> filterFactories;
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77 private final HgRepository repo;
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78 private final File repoDir;
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79 private final boolean isCaseSensitiveFileSystem;
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80 private final boolean shallCacheRevlogsInRepo;
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81 private final DataAccessProvider dataAccess;
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83 @SuppressWarnings("unused")
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84 private final int requiresFlags;
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85
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86 private final PathRewrite dataPathHelper; // access to file storage area (usually under .hg/store/data/), with filenames mangled
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87 private final PathRewrite repoPathHelper; // access to system files (under .hg/store if requires has 'store' flag)
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89 public Internals(HgRepository hgRepo, File hgDir) throws HgRuntimeException {
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90 repo = hgRepo;
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91 repoDir = hgDir;
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92 isCaseSensitiveFileSystem = !runningOnWindows();
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93 SessionContext ctx = repo.getSessionContext();
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94 shallCacheRevlogsInRepo = new PropertyMarshal(ctx).getBoolean(CFG_PROPERTY_REVLOG_STREAM_CACHE, true);
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95 dataAccess = new DataAccessProvider(ctx);
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96 RepoInitializer repoInit = new RepoInitializer().initRequiresFromFile(repoDir);
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97 requiresFlags = repoInit.getRequires();
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98 dataPathHelper = repoInit.buildDataFilesHelper(getContext());
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99 repoPathHelper = repoInit.buildStoreFilesHelper();
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100 }
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101
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102 public boolean isInvalid() {
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103 return !repoDir.exists() || !repoDir.isDirectory();
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104 }
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105
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106 /**
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107 * Access files under ".hg/".
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108 * File not necessarily exists, this method is merely a factory for Files at specific, configuration-dependent location.
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109 *
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110 * @param name shall be normalized path
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111 */
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112 public File getFileFromRepoDir(String name) {
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113 return new File(repoDir, name);
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114 }
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115
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116 /**
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117 * Access files under ".hg/store/" or ".hg/" depending on use of 'store' in requires.
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118 * File not necessarily exists, this method is merely a factory for Files at specific, configuration-dependent location.
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119 *
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120 * @param name shall be normalized path
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121 */
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122 public File getFileFromStoreDir(String name) {
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123 CharSequence location = repoPathHelper.rewrite(name);
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124 return new File(repoDir, location.toString());
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125 }
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126
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127 /**
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128 * Access files under ".hg/store/data", ".hg/store/dh/" or ".hg/data" according to settings in requires file.
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129 * File not necessarily exists, this method is merely a factory for Files at specific, configuration-dependent location.
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130 *
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131 * @param name shall be normalized path, without .i or .d suffixes
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132 */
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133 public File getFileFromDataDir(CharSequence path) {
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134 CharSequence storagePath = dataPathHelper.rewrite(path);
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135 return new File(repoDir, storagePath.toString());
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136 }
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137
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138 public SessionContext getContext() {
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139 return repo.getSessionContext();
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140 }
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141
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142 public HgRepository getRepo() {
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143 return repo;
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144 }
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145
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146 public DataAccessProvider getDataAccess() {
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147 return dataAccess;
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148 }
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149
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150 public PathRewrite buildNormalizePathRewrite() {
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151 if (runningOnWindows()) {
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152 return new WinToNixPathRewrite();
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153 } else {
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154 return new PathRewrite.Empty(); // or strip leading slash, perhaps?
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155 }
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156 }
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157
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158 public List<Filter.Factory> getFilters() {
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159 if (filterFactories == null) {
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160 filterFactories = new ArrayList<Filter.Factory>();
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161 ExtensionsSection cfg = repo.getConfiguration().getExtensions();
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162 if (cfg.isEnabled("eol")) {
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163 NewlineFilter.Factory ff = new NewlineFilter.Factory();
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164 ff.initialize(repo);
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165 filterFactories.add(ff);
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166 }
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167 if (cfg.isEnabled("keyword")) {
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168 KeywordFilter.Factory ff = new KeywordFilter.Factory();
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169 ff.initialize(repo);
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170 filterFactories.add(ff);
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171 }
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172 }
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173 return filterFactories;
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174 }
202
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175
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176 public boolean isCaseSensitiveFileSystem() {
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177 return isCaseSensitiveFileSystem;
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178 }
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179
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180 public EncodingHelper buildFileNameEncodingHelper() {
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181 SessionContext ctx = repo.getSessionContext();
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182 return new EncodingHelper(getFileEncoding(ctx), ctx);
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183 }
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184
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185 /*package-local*/ static Charset getFileEncoding(SessionContext ctx) {
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186 Object altEncoding = ctx.getConfigurationProperty(CFG_PROPERTY_FS_FILENAME_ENCODING, null);
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187 Charset cs;
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188 if (altEncoding == null) {
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189 cs = Charset.defaultCharset();
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190 } else {
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191 try {
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192 cs = Charset.forName(altEncoding.toString());
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193 } catch (IllegalArgumentException ex) {
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194 // both IllegalCharsetNameException and UnsupportedCharsetException are subclasses of IAE, too
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195 // not severe enough to throw an exception, imo. Just record the fact it's bad ad we ignore it
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196 ctx.getLog().dump(Internals.class, Error, ex, String.format("Bad configuration value for filename encoding %s", altEncoding));
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197 cs = Charset.defaultCharset();
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198 }
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199 }
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200 return cs;
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201 }
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202
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203 /**
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204 * Access to mangled name of a file in repository storage, may come handy for debug.
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205 * @return mangled path of the repository file
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206 */
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207 public CharSequence getStoragePath(HgDataFile df) {
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208 return dataPathHelper.rewrite(df.getPath().toString());
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209 }
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210
202
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211
292
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212 public static boolean runningOnWindows() {
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213 return System.getProperty("os.name").indexOf("Windows") != -1;
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214 }
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215
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216 /**
419
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217 * @param fsHint optional hint pointing to filesystem of interest (generally, it's possible to mount
413
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218 * filesystems with different capabilities and repository's capabilities would depend on which fs it resides)
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219 * @return <code>true</code> if executable files deserve tailored handling
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220 */
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221 public static boolean checkSupportsExecutables(File fsHint) {
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222 // *.exe are not executables for Mercurial
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223 return !runningOnWindows();
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224 }
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225
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226 /**
419
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227 * @param fsHint optional hint pointing to filesystem of interest (generally, it's possible to mount
413
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228 * filesystems with different capabilities and repository's capabilities would depend on which fs it resides)
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229 * @return <code>true</code> if filesystem knows what symbolic links are
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230 */
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231 public static boolean checkSupportsSymlinks(File fsHint) {
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232 // Windows supports soft symbolic links starting from Vista
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233 // However, as of Mercurial 2.1.1, no support for this functionality
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234 // 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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235 return !runningOnWindows();
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236 }
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237
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238
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239 /**
379
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240 * For Unix, returns installation root, which is the parent directory of the hg executable (or symlink) being run.
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241 * For Windows, it's Mercurial installation directory itself
382
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242 * @param ctx
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243 */
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244 private static File findHgInstallRoot(SessionContext ctx) {
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245 // let clients to override Hg install location
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246 String p = (String) ctx.getConfigurationProperty(CFG_PROPERTY_HG_INSTALL_ROOT, null);
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247 if (p != null) {
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248 return new File(p);
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249 }
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250 StringTokenizer st = new StringTokenizer(System.getenv("PATH"), System.getProperty("path.separator"), false);
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251 final boolean runsOnWin = runningOnWindows();
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252 while (st.hasMoreTokens()) {
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253 String pe = st.nextToken();
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254 File execCandidate = new File(pe, runsOnWin ? "hg.exe" : "hg");
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255 if (execCandidate.exists() && execCandidate.isFile()) {
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256 File execDir = execCandidate.getParentFile();
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257 // e.g. on Unix runs "/shared/tools/bin/hg", directory of interest is "/shared/tools/"
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258 return runsOnWin ? execDir : execDir.getParentFile();
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259 }
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260 }
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261 return null;
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262 }
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263
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264 /**
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265 * @see http://www.selenic.com/mercurial/hgrc.5.html
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266 */
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267 public ConfigFile readConfiguration() throws IOException {
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268 SessionContext sessionCtx = repo.getSessionContext();
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269 ConfigFile configFile = new ConfigFile(sessionCtx);
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270 File hgInstallRoot = findHgInstallRoot(sessionCtx); // may be null
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271 //
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272 if (runningOnWindows()) {
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273 if (hgInstallRoot != null) {
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274 for (File f : getWindowsConfigFilesPerInstall(hgInstallRoot)) {
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275 configFile.addLocation(f);
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276 }
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277 }
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278 LinkedHashSet<String> locations = new LinkedHashSet<String>();
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279 locations.add(System.getenv("USERPROFILE"));
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280 locations.add(System.getenv("HOME"));
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281 locations.remove(null);
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282 for (String loc : locations) {
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283 File location = new File(loc);
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284 configFile.addLocation(new File(location, "Mercurial.ini"));
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285 configFile.addLocation(new File(location, ".hgrc"));
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286 }
351
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287 } else {
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288 if (hgInstallRoot != null) {
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289 File d = new File(hgInstallRoot, "etc/mercurial/hgrc.d/");
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290 if (d.isDirectory() && d.canRead()) {
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291 for (File f : listConfigFiles(d)) {
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292 configFile.addLocation(f);
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293 }
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294 }
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295 configFile.addLocation(new File(hgInstallRoot, "etc/mercurial/hgrc"));
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296 }
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297 // same, but with absolute paths
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298 File d = new File("/etc/mercurial/hgrc.d/");
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299 if (d.isDirectory() && d.canRead()) {
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300 for (File f : listConfigFiles(d)) {
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301 configFile.addLocation(f);
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302 }
351
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303 }
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304 configFile.addLocation(new File("/etc/mercurial/hgrc"));
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305 configFile.addLocation(new File(System.getenv("HOME"), ".hgrc"));
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306 }
331
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307 // last one, overrides anything else
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308 // <repo>/.hg/hgrc
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309 configFile.addLocation(getFileFromRepoDir("hgrc"));
331
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310 return configFile;
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311 }
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312
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313 private static List<File> getWindowsConfigFilesPerInstall(File hgInstallDir) {
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314 File f = new File(hgInstallDir, "Mercurial.ini");
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315 if (f.exists()) {
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316 return Collections.singletonList(f);
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317 }
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318 f = new File(hgInstallDir, "hgrc.d/");
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319 if (f.canRead() && f.isDirectory()) {
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320 return listConfigFiles(f);
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321 }
418
528b6780a8bd A bit of FIXME cleanup (mostly degraded to TODO post 1.0), comments and javadoc
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diff changeset
322 // TODO post-1.0 query registry, e.g. with
379
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323 // Runtime.exec("reg query HKLM\Software\Mercurial")
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324 //
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325 f = new File("C:\\Mercurial\\Mercurial.ini");
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326 if (f.exists()) {
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327 return Collections.singletonList(f);
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328 }
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329 return Collections.emptyList();
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330 }
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331
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332 private static List<File> listConfigFiles(File dir) {
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333 assert dir.canRead();
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334 assert dir.isDirectory();
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335 final File[] allFiles = dir.listFiles();
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336 // File is Comparable, lexicographically by default
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337 Arrays.sort(allFiles);
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338 ArrayList<File> rv = new ArrayList<File>(allFiles.length);
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339 for (File f : allFiles) {
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340 if (f.getName().endsWith(".rc")) {
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diff changeset
341 rv.add(f);
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342 }
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343 }
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344 return rv;
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345 }
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346
382
82336b7c54f4 Per-repository UpdateConfigCommand completed. Access to system properties through SessionContext to ease alternation
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347 public static File getInstallationConfigurationFileToWrite(SessionContext ctx) {
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348 File hgInstallRoot = findHgInstallRoot(ctx); // may be null
379
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349 // choice of which hgrc to pick here is according to my own pure discretion
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diff changeset
350 if (hgInstallRoot != null) {
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351 // use this location only if it's writable
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352 File cfg = new File(hgInstallRoot, runningOnWindows() ? "Mercurial.ini" : "etc/mercurial/hgrc");
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353 if (cfg.canWrite() || cfg.getParentFile().canWrite()) {
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354 return cfg;
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355 }
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356 }
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357 // fallback
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358 if (runningOnWindows()) {
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diff changeset
359 if (hgInstallRoot == null) {
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360 return new File("C:\\Mercurial\\Mercurial.ini");
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361 } else {
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diff changeset
362 // yes, we tried this file already (above) and found it non-writable
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diff changeset
363 // let caller fail with can't write
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364 return new File(hgInstallRoot, "Mercurial.ini");
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365 }
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diff changeset
366 } else {
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367 return new File("/etc/mercurial/hgrc");
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368 }
378
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parents: 351
diff changeset
369 }
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diff changeset
370
382
82336b7c54f4 Per-repository UpdateConfigCommand completed. Access to system properties through SessionContext to ease alternation
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diff changeset
371 public static File getUserConfigurationFileToWrite(SessionContext ctx) {
379
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372 LinkedHashSet<String> locations = new LinkedHashSet<String>();
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373 final boolean runsOnWindows = runningOnWindows();
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374 if (runsOnWindows) {
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375 locations.add(System.getenv("USERPROFILE"));
378
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376 }
379
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377 locations.add(System.getenv("HOME"));
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diff changeset
378 locations.remove(null);
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379 for (String loc : locations) {
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diff changeset
380 File location = new File(loc);
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381 File rv = new File(location, ".hgrc");
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diff changeset
382 if (rv.exists() && rv.canWrite()) {
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383 return rv;
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384 }
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diff changeset
385 if (runsOnWindows) {
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386 rv = new File(location, "Mercurial.ini");
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diff changeset
387 if (rv.exists() && rv.canWrite()) {
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diff changeset
388 return rv;
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389 }
378
9fb990c8a724 Investigate approaches to alter Mercurial configuration files
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parents: 351
diff changeset
390 }
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diff changeset
391 }
379
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diff changeset
392 // 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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diff changeset
393 return new File(System.getProperty("user.home"), ".hgrc");
378
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diff changeset
394 }
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
395
b015f3918120 Work on FIXME: correct HgDataFile#workingCopy with tests; BasicSessionContext with property override; platform-specific options to internals
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parents: 382
diff changeset
396 public boolean shallCacheRevlogs() {
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diff changeset
397 return shallCacheRevlogsInRepo;
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 382
diff changeset
398 }
407
30922c728341 Better multiline log printout; options to tune default log output
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parents: 388
diff changeset
399
30922c728341 Better multiline log printout; options to tune default log output
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diff changeset
400 public static <T> CharSequence join(Iterable<T> col, CharSequence separator) {
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parents: 388
diff changeset
401 if (col == null) {
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parents: 388
diff changeset
402 return String.valueOf(col);
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parents: 388
diff changeset
403 }
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diff changeset
404 Iterator<T> it = col.iterator();
30922c728341 Better multiline log printout; options to tune default log output
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parents: 388
diff changeset
405 if (!it.hasNext()) {
30922c728341 Better multiline log printout; options to tune default log output
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parents: 388
diff changeset
406 return "[]";
30922c728341 Better multiline log printout; options to tune default log output
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 388
diff changeset
407 }
30922c728341 Better multiline log printout; options to tune default log output
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 388
diff changeset
408 String v = String.valueOf(it.next());
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parents: 388
diff changeset
409 StringBuilder sb = new StringBuilder(v);
30922c728341 Better multiline log printout; options to tune default log output
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parents: 388
diff changeset
410 while (it.hasNext()) {
30922c728341 Better multiline log printout; options to tune default log output
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parents: 388
diff changeset
411 sb.append(separator);
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parents: 388
diff changeset
412 v = String.valueOf(it.next());
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parents: 388
diff changeset
413 sb.append(v);
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parents: 388
diff changeset
414 }
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 388
diff changeset
415 return sb;
30922c728341 Better multiline log printout; options to tune default log output
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parents: 388
diff changeset
416 }
420
6c22bdc0bdfd Respect long offsets in revlogs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 419
diff changeset
417
6c22bdc0bdfd Respect long offsets in revlogs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 419
diff changeset
418 /**
6c22bdc0bdfd Respect long offsets in revlogs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 419
diff changeset
419 * 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
420 * 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
421 * (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
422 */
6c22bdc0bdfd Respect long offsets in revlogs
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parents: 419
diff changeset
423 public static int ltoi(long l) {
6c22bdc0bdfd Respect long offsets in revlogs
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parents: 419
diff changeset
424 int i = (int) l;
6c22bdc0bdfd Respect long offsets in revlogs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 419
diff changeset
425 assert ((long) i) == l : "Loss of data!";
6c22bdc0bdfd Respect long offsets in revlogs
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parents: 419
diff changeset
426 return i;
6c22bdc0bdfd Respect long offsets in revlogs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 419
diff changeset
427 }
74
6f1b88693d48 Complete refactoring to org.tmatesoft
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
428 }