Mercurial > hg4j

annotate src/org/tmatesoft/hg/internal/Internals.java @ 379:fa2be7a05af6

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Implement discovery of mercurial installation, use it to read/write configuration files
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 09 Feb 2012 16:47:17 +0100
parents 9fb990c8a724
children 82336b7c54f4
rev   line source
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1 /*
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2 * Copyright (c) 2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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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.internal.RequiresFile.*;
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20
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21 import java.io.File;
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22 import java.io.FileOutputStream;
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23 import java.io.IOException;
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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.LinkedHashSet;
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28 import java.util.List;
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29 import java.util.StringTokenizer;
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30
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31 import org.tmatesoft.hg.repo.HgInternals;
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32 import org.tmatesoft.hg.repo.HgRepoConfig.ExtensionsSection;
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33 import org.tmatesoft.hg.repo.HgRepository;
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34 import org.tmatesoft.hg.util.PathRewrite;
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35
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36 /**
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37 * Fields/members that shall not be visible
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38 *
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39 * @author Artem Tikhomirov
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40 * @author TMate Software Ltd.
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41 */
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42 public class Internals {
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44 public static final String CFG_PROPERTY_HG_INSTALL_ROOT = "hg4j.hg.install_root";
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45
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46 private int requiresFlags = 0;
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47 private List<Filter.Factory> filterFactories;
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48
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49
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50 public Internals() {
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51 }
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52
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53 public void parseRequires(HgRepository hgRepo, File requiresFile) {
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54 try {
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55 new RequiresFile().parse(this, requiresFile);
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56 } catch (IOException ex) {
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57 // FIXME not quite sure error reading requires file shall be silently logged only.
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58 HgInternals.getContext(hgRepo).getLog().error(getClass(), ex, null);
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59 }
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60 }
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62 public/*for tests, otherwise pkg*/ void setStorageConfig(int version, int flags) {
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63 requiresFlags = flags;
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64 }
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66 // XXX perhaps, should keep both fields right here, not in the HgRepository
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67 public PathRewrite buildDataFilesHelper() {
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68 return new StoragePathHelper((requiresFlags & STORE) != 0, (requiresFlags & FNCACHE) != 0, (requiresFlags & DOTENCODE) != 0);
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69 }
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71 public PathRewrite buildRepositoryFilesHelper() {
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72 if ((requiresFlags & STORE) != 0) {
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73 return new PathRewrite() {
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74 public CharSequence rewrite(CharSequence path) {
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75 return "store/" + path;
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76 }
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77 };
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78 } else {
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79 return new PathRewrite.Empty();
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80 }
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81 }
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83 public List<Filter.Factory> getFilters(HgRepository hgRepo) {
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84 if (filterFactories == null) {
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85 filterFactories = new ArrayList<Filter.Factory>();
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86 ExtensionsSection cfg = hgRepo.getConfiguration().getExtensions();
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87 if (cfg.isEnabled("eol")) {
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88 NewlineFilter.Factory ff = new NewlineFilter.Factory();
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89 ff.initialize(hgRepo);
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90 filterFactories.add(ff);
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91 }
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92 if (cfg.isEnabled("keyword")) {
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93 KeywordFilter.Factory ff = new KeywordFilter.Factory();
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94 ff.initialize(hgRepo);
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95 filterFactories.add(ff);
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96 }
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97 }
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98 return filterFactories;
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99 }
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101 public void initEmptyRepository(File hgDir) throws IOException {
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102 hgDir.mkdir();
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103 FileOutputStream requiresFile = new FileOutputStream(new File(hgDir, "requires"));
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104 StringBuilder sb = new StringBuilder(40);
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105 sb.append("revlogv1\n");
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106 if ((requiresFlags & STORE) != 0) {
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107 sb.append("store\n");
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108 }
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109 if ((requiresFlags & FNCACHE) != 0) {
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110 sb.append("fncache\n");
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111 }
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112 if ((requiresFlags & DOTENCODE) != 0) {
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113 sb.append("dotencode\n");
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114 }
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115 requiresFile.write(sb.toString().getBytes());
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116 requiresFile.close();
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117 new File(hgDir, "store").mkdir(); // with that, hg verify says ok.
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118 }
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119
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120 public static boolean runningOnWindows() {
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121 return System.getProperty("os.name").indexOf("Windows") != -1;
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122 }
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123
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124 /**
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125 * For Unix, returns installation root, which is the parent directory of the hg executable (or symlink) being run.
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126 * For Windows, it's Mercurial installation directory itself
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127 */
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128 private static File findHgInstallRoot() {
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129 // let clients to override Hg install location
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130 String p = System.getProperty(CFG_PROPERTY_HG_INSTALL_ROOT);
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131 if (p != null) {
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132 return new File(p);
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133 }
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134 StringTokenizer st = new StringTokenizer(System.getenv("PATH"), System.getProperty("path.separator"), false);
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135 final boolean runsOnWin = runningOnWindows();
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136 while (st.hasMoreTokens()) {
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137 String pe = st.nextToken();
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138 File execCandidate = new File(pe, runsOnWin ? "hg.exe" : "hg");
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139 if (execCandidate.exists() && execCandidate.isFile()) {
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140 File execDir = execCandidate.getParentFile();
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141 // e.g. on Unix runs "/shared/tools/bin/hg", directory of interest is "/shared/tools/"
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142 return runsOnWin ? execDir : execDir.getParentFile();
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143 }
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144 }
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145 return null;
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146 }
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147
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148 /**
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149 * @see http://www.selenic.com/mercurial/hgrc.5.html
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150 */
331
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151 public ConfigFile readConfiguration(HgRepository hgRepo, File repoRoot) throws IOException {
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152 ConfigFile configFile = new ConfigFile();
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153 File hgInstallRoot = findHgInstallRoot(); // may be null
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154 //
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155 if (runningOnWindows()) {
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156 if (hgInstallRoot != null) {
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157 for (File f : getWindowsConfigFilesPerInstall(hgInstallRoot)) {
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158 configFile.addLocation(f);
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159 }
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160 }
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161 LinkedHashSet<String> locations = new LinkedHashSet<String>();
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162 locations.add(System.getenv("USERPROFILE"));
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163 locations.add(System.getenv("HOME"));
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164 locations.remove(null);
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165 for (String loc : locations) {
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166 File location = new File(loc);
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167 configFile.addLocation(new File(location, "Mercurial.ini"));
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168 configFile.addLocation(new File(location, ".hgrc"));
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169 }
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170 } else {
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171 if (hgInstallRoot != null) {
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172 File d = new File(hgInstallRoot, "etc/mercurial/hgrc.d/");
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173 if (d.isDirectory() && d.canRead()) {
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174 for (File f : listConfigFiles(d)) {
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175 configFile.addLocation(f);
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176 }
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177 }
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178 configFile.addLocation(new File(hgInstallRoot, "etc/mercurial/hgrc"));
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179 }
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180 // same, but with absolute paths
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181 File d = new File("/etc/mercurial/hgrc.d/");
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182 if (d.isDirectory() && d.canRead()) {
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183 for (File f : listConfigFiles(d)) {
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184 configFile.addLocation(f);
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185 }
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186 }
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187 configFile.addLocation(new File("/etc/mercurial/hgrc"));
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188 configFile.addLocation(new File(System.getenv("HOME"), ".hgrc"));
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189 }
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190 // last one, overrides anything else
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191 // <repo>/.hg/hgrc
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192 configFile.addLocation(new File(repoRoot, "hgrc"));
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193 return configFile;
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194 }
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195
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196 private static List<File> getWindowsConfigFilesPerInstall(File hgInstallDir) {
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197 File f = new File(hgInstallDir, "Mercurial.ini");
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198 if (f.exists()) {
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199 return Collections.singletonList(f);
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200 }
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201 f = new File(hgInstallDir, "hgrc.d/");
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202 if (f.canRead() && f.isDirectory()) {
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203 return listConfigFiles(f);
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204 }
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205 // FIXME query registry, e.g. with
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206 // Runtime.exec("reg query HKLM\Software\Mercurial")
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207 //
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208 f = new File("C:\\Mercurial\\Mercurial.ini");
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209 if (f.exists()) {
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210 return Collections.singletonList(f);
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211 }
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212 return Collections.emptyList();
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213 }
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214
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215 private static List<File> listConfigFiles(File dir) {
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216 assert dir.canRead();
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217 assert dir.isDirectory();
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218 final File[] allFiles = dir.listFiles();
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219 // File is Comparable, lexicographically by default
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220 Arrays.sort(allFiles);
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221 ArrayList<File> rv = new ArrayList<File>(allFiles.length);
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222 for (File f : allFiles) {
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223 if (f.getName().endsWith(".rc")) {
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224 rv.add(f);
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225 }
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226 }
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227 return rv;
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228 }
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229
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230 public static File getInstallationConfigurationFileToWrite() {
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231 File hgInstallRoot = findHgInstallRoot(); // may be null
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232 // choice of which hgrc to pick here is according to my own pure discretion
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233 if (hgInstallRoot != null) {
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234 // use this location only if it's writable
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235 File cfg = new File(hgInstallRoot, runningOnWindows() ? "Mercurial.ini" : "etc/mercurial/hgrc");
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236 if (cfg.canWrite() || cfg.getParentFile().canWrite()) {
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237 return cfg;
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238 }
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239 }
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240 // fallback
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241 if (runningOnWindows()) {
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242 if (hgInstallRoot == null) {
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243 return new File("C:\\Mercurial\\Mercurial.ini");
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244 } else {
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245 // yes, we tried this file already (above) and found it non-writable
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246 // let caller fail with can't write
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247 return new File(hgInstallRoot, "Mercurial.ini");
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248 }
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249 } else {
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250 return new File("/etc/mercurial/hgrc");
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251 }
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252 }
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253
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254 public static File getUserConfigurationFileToWrite() {
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255 LinkedHashSet<String> locations = new LinkedHashSet<String>();
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256 final boolean runsOnWindows = runningOnWindows();
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257 if (runsOnWindows) {
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258 locations.add(System.getenv("USERPROFILE"));
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259 }
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260 locations.add(System.getenv("HOME"));
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261 locations.remove(null);
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262 for (String loc : locations) {
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263 File location = new File(loc);
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264 File rv = new File(location, ".hgrc");
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265 if (rv.exists() && rv.canWrite()) {
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266 return rv;
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267 }
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268 if (runsOnWindows) {
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269 rv = new File(location, "Mercurial.ini");
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270 if (rv.exists() && rv.canWrite()) {
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271 return rv;
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272 }
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273 }
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274 }
379
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275 // fallback to default, let calling code fail with Exception if can't write
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276 return new File(System.getProperty("user.home"), ".hgrc");
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277 }
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278 }