Mercurial > jhg

annotate src/org/tmatesoft/hg/repo/HgLookup.java @ 699:a483b2b68a2e

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Provisional APIs and respective implementation for http, https and ssh remote repositories
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 08 Aug 2013 19:18:50 +0200
parents 822f3a83ff57
children
rev   line source
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1 /*
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2 * Copyright (c) 2010-2013 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.repo;
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19 import static org.tmatesoft.hg.util.LogFacility.Severity.Warn;
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20
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21 import java.io.File;
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22 import java.net.URI;
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23 import java.net.URISyntaxException;
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24 import java.net.URL;
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25 import java.net.URLStreamHandler;
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26 import java.net.URLStreamHandlerFactory;
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28 import org.tmatesoft.hg.core.HgBadArgumentException;
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29 import org.tmatesoft.hg.core.HgIOException;
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30 import org.tmatesoft.hg.core.HgRepositoryNotFoundException;
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31 import org.tmatesoft.hg.core.SessionContext;
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32 import org.tmatesoft.hg.internal.BasicSessionContext;
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33 import org.tmatesoft.hg.internal.ConfigFile;
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34 import org.tmatesoft.hg.internal.DataAccessProvider;
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35 import org.tmatesoft.hg.internal.RequiresFile;
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36 import org.tmatesoft.hg.repo.HgRepoConfig.PathsSection;
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37
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38 /**
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39 * Utility methods to find Mercurial repository at a given location
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40 *
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41 * @author Artem Tikhomirov
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42 * @author TMate Software Ltd.
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43 */
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44 public class HgLookup implements SessionContext.Source {
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46 private ConfigFile globalCfg;
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47 private SessionContext sessionContext;
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48
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49 public HgLookup() {
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50 }
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51
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52 public HgLookup(SessionContext ctx) {
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53 sessionContext = ctx;
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54 }
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56 public HgRepository detectFromWorkingDir() throws HgRepositoryNotFoundException {
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57 return detect(System.getProperty("user.dir"));
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58 }
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59
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60 public HgRepository detect(String location) throws HgRepositoryNotFoundException {
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61 return detect(new File(location));
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62 }
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63
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64 /**
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65 * Look up repository in specified location and above
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66 *
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67 * @param location where to look for .hg directory, never <code>null</code>
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68 * @return repository object, never <code>null</code>
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69 * @throws HgRepositoryNotFoundException if no repository found, or repository version is not supported
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70 */
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71 public HgRepository detect(File location) throws HgRepositoryNotFoundException {
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72 File dir = location.getAbsoluteFile();
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73 File repository;
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74 do {
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75 repository = new File(dir, ".hg");
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76 if (repository.exists() && repository.isDirectory()) {
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77 break;
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78 }
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79 repository = null;
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80 dir = dir.getParentFile();
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81
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82 } while(dir != null);
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83 if (repository == null) {
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84 throw new HgRepositoryNotFoundException(String.format("Can't locate .hg/ directory of Mercurial repository in %s nor in parent dirs", location)).setLocation(location.getPath());
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85 }
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86 try {
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87 String repoPath = repository.getParentFile().getAbsolutePath();
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88 HgRepository rv = new HgRepository(getSessionContext(), repoPath, repository);
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89 int requiresFlags = rv.getImplHelper().getRequiresFlags();
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90 if ((requiresFlags & RequiresFile.REVLOGV1) == 0) {
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91 throw new HgRepositoryNotFoundException(String.format("%s: repository version is not supported (Mercurial <0.9?)", repoPath)).setLocation(location.getPath());
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92 }
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93 return rv;
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94 } catch (HgRuntimeException ex) {
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95 HgRepositoryNotFoundException e = new HgRepositoryNotFoundException("Failed to initialize Hg4J library").setLocation(location.getPath());
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96 e.initCause(ex);
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97 throw e;
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98 }
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99 }
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100
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101 public HgBundle loadBundle(File location) throws HgRepositoryNotFoundException {
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102 if (location == null || !location.canRead()) {
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103 throw new HgRepositoryNotFoundException(String.format("Can't read file %s", location)).setLocation(String.valueOf(location));
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104 }
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105 return new HgBundle(getSessionContext(), new DataAccessProvider(getSessionContext()), location).link();
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106 }
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108 /**
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109 * Try to instantiate remote server using an immediate url or an url from configuration files
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110 *
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111 * @param key either URL or a key from configuration file that points to remote server; if <code>null</code> or empty string, default remote location of the supplied repository (if any) is looked up
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112 * @param hgRepo optional local repository to get default or otherwise configured remote location
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113 * @return an instance featuring access to remote repository, check {@link HgRemoteRepository#isInvalid()} before actually using it
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114 * @throws HgBadArgumentException if anything is wrong with the remote server's URL
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115 */
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116 public HgRemoteRepository detectRemote(String key, HgRepository hgRepo) throws HgBadArgumentException {
698
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117 URI uri;
181
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118 Exception toReport;
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119 try {
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120 uri = new URI(key);
181
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121 toReport = null;
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122 } catch (URISyntaxException ex) {
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123 uri = null;
181
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124 toReport = ex;
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125 }
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126 if (uri == null) {
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127 String server = null;
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128 if (hgRepo != null && !hgRepo.isInvalid()) {
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129 PathsSection ps = hgRepo.getConfiguration().getPaths();
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130 server = key == null || key.trim().length() == 0 ? ps.getDefault() : ps.getString(key, null); // XXX Java 1.5 isEmpty()
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131 } else if (key == null || key.trim().length() == 0) {
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132 throw new HgBadArgumentException("Can't look up empty key in a global configuration", null);
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133 }
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134 if (server == null) {
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135 server = getGlobalConfig().getSection("paths").get(key);
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136 }
181
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137 if (server == null) {
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138 throw new HgBadArgumentException(String.format("Can't find server %s specification in the config", key), toReport);
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139 }
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140 try {
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141 uri = new URI(server);
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142 } catch (URISyntaxException ex) {
181
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143 throw new HgBadArgumentException(String.format("Found %s server spec in the config, but failed to initialize with it", key), ex);
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144 }
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145 }
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146 return detectRemote(uri);
181
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147 }
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148
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149 /**
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150 * Detect remote repository
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151 * <p>Use of this method is discouraged, please use {@link #detectRemote(URI)} instead}
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152 *
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153 * @param url location of remote repository
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154 * @return instance to interact with remote repository
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155 * @throws HgBadArgumentException if location format is not a valid {@link URI}
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156 * @throws IllegalArgumentException if url is <code>null</code>
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157 */
295
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158 public HgRemoteRepository detect(URL url) throws HgBadArgumentException {
171
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159 if (url == null) {
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160 throw new IllegalArgumentException();
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161 }
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162 try {
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163 return detectRemote(url.toURI());
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164 } catch (URISyntaxException ex) {
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165 throw new HgBadArgumentException(String.format("Bad remote repository location: %s", url), ex);
170
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166 }
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167 }
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168
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169 /**
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170 * Resolves location of remote repository.
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171 *
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172 * <p>Choice between {@link URI URIs} and {@link URL URLs} done in favor of former because they are purely syntactical,
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173 * while latter have semantics of {@link URL#openConnection() connection} establishing, which is not always possible.
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174 * E.g. one can't instantiate <code>new URL("ssh://localhost/")</code> as long as there's no local {@link URLStreamHandler}
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175 * for the protocol, which is the case for certain JREs out there. The way {@link URLStreamHandlerFactory URLStreamHandlerFactories}
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176 * are installed (static field/method) is quite fragile, and definitely not the one to rely on from a library's code (apps can carefully
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177 * do this, but library can't install own nor expect anyone outside there would do). Use of fake {@link URLStreamHandler} (fails to open
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178 * every connection) is possible, of course, although it seems to be less appropriate when there is alternative with {@link URI URIs}.
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179 *
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180 * @param uriRemote remote repository location
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181 * @return instance to interact with remote repository
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182 * @throws HgBadArgumentException
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183 */
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184 public HgRemoteRepository detectRemote(URI uriRemote) throws HgBadArgumentException {
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185 HgRemoteRepository.RemoteDescriptor rd = getSessionContext().getRemoteDescriptor(uriRemote);
698
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186 if (rd == null) {
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187 throw new HgBadArgumentException(String.format("Unsupported remote repository location:%s", uriRemote), null);
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188 }
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189 return new HgRemoteRepository(getSessionContext(), rd);
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190 }
181
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191
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192 private ConfigFile getGlobalConfig() {
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193 if (globalCfg == null) {
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194 globalCfg = new ConfigFile(getSessionContext());
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195 try {
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196 globalCfg.addLocation(new File(System.getProperty("user.home"), ".hgrc"));
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197 } catch (HgIOException ex) {
295
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198 // XXX perhaps, makes sense to let caller/client know that we've failed to read global config?
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199 getSessionContext().getLog().dump(getClass(), Warn, ex, null);
295
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200 }
181
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201 }
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202 return globalCfg;
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203 }
295
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204
618
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205 public SessionContext getSessionContext() {
295
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206 if (sessionContext == null) {
431
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207 sessionContext = new BasicSessionContext(null);
295
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208 }
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209 return sessionContext;
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210 }
2
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211 }