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Support and respect for symbolic links and executable flag, with /bin/ls backed implementation to discover these
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Mar 2012 20:40:28 +0100
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children 9c9c442b5f2e
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413
7f27122011c3 Support and respect for symbolic links and executable flag, with /bin/ls backed implementation to discover these
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1 /*
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2 * Copyright (c) 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.util;
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18
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19 import java.io.File;
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20 import java.io.IOException;
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21 import java.util.ArrayList;
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22 import java.util.Arrays;
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23 import java.util.Collections;
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24 import java.util.HashMap;
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25 import java.util.HashSet;
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26 import java.util.List;
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27 import java.util.Map;
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28 import java.util.Set;
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29 import java.util.TreeMap;
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30 import java.util.regex.Matcher;
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31 import java.util.regex.Pattern;
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32
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33 import org.tmatesoft.hg.internal.Internals;
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34 import org.tmatesoft.hg.internal.ProcessExecHelper;
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35
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36 /**
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37 * Utility to collect executable files and symbolic links in a directory.
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38 *
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39 *
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40 * Not public as present approach (expect file but collect once per directory) may need to be made explicit
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41 *
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42 * TODO post-1.0 Add Linux-specific set of tests (similar to my test-flags repository, with symlink, executable and regular file,
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43 * and few revisions where link and exec flags change. +testcase when link points to non-existing file (shall not report as missing,
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44 * iow either FileInfo.exist() shall respect symlinks or WCSC account for )
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45 *
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46 * TODO post-1.0 Add extraction of link modification time, see RegularFileInfo#lastModified()
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47 *
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48 * @author Artem Tikhomirov
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49 * @author Tmate Software Ltd.
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50 */
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51 /*package-local*/ class RegularFileStats {
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52 private boolean isExec, isSymlink;
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53 private String symlinkValue;
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54 private final List<String> command;
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55 private final ProcessExecHelper execHelper;
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56 private final Matcher linkMatcher, execMatcher;
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57
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58
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59 // directory name to (short link name -> link target)
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60 private Map<String, Map<String, String>> dir2links = new TreeMap<String, Map<String, String>>();
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61 // directory name to set of executable file short names
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62 private Map<String, Set<String>> dir2execs = new TreeMap<String, Set<String>>();
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63
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64
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65 RegularFileStats() {
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66 if (Internals.runningOnWindows()) {
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67 // XXX this implementation is not yet tested against any Windows repository,
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68 // only against sample dir listings. As long as Mercurial doesn't handle Windows
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69 // links, we don't really need this
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70 command = Arrays.asList("cmd", "/c", "dir");
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71 // Windows patterns need to work against full directory listing (I didn't find a way
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72 // to list single file with its attributes like SYMLINK)
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73 Pattern pLink = Pattern.compile("^\\S+.*\\s+<SYMLINK>\\s+(\\S.*)\\s+\\[(.+)\\]$", Pattern.MULTILINE);
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74 Pattern pExec = Pattern.compile("^\\S+.*\\s+\\d+\\s+(\\S.*\\.exe)$", Pattern.MULTILINE);
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75 linkMatcher = pLink.matcher("");
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76 execMatcher = pExec.matcher("");
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77 } else {
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78 command = Arrays.asList("/bin/ls", "-l", "-Q"); // -Q is essential to get quoted name - the only way to
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79 // tell exact file name (which may start or end with spaces.
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80 Pattern pLink = Pattern.compile("^lrwxrwxrwx\\s.*\\s\"(.*)\"\\s+->\\s+\"(.*)\"$", Pattern.MULTILINE);
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81 // pLink: group(1) is full name if single file listing (ls -l /usr/bin/java) and short name if directory listing (ls -l /usr/bin)
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82 // group(2) is link target
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83 Pattern pExec = Pattern.compile("^-..[sx]..[sx]..[sx]\\s.*\\s\"(.+)\"$", Pattern.MULTILINE);
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84 // pExec: group(1) is name of executable file
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85 linkMatcher = pLink.matcher("");
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86 execMatcher = pExec.matcher("");
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87 }
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88 execHelper = new ProcessExecHelper();
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89 }
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90
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91 public void init(File f) {
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92 // can't check isFile because Java would say false for a symlink with non-existing target
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93 if (f.isDirectory()) {
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94 // perhaps, shall just collect stats for all files and set false to exec/link flags?
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95 throw new IllegalArgumentException(); // FIXME EXCEPTIONS
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96 }
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97 final String dirName = f.getParentFile().getAbsolutePath();
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98 final String fileName = f.getName();
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99 Map<String, String> links = dir2links.get(dirName);
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100 Set<String> execs = dir2execs.get(dirName);
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101 if (links == null || execs == null) {
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102 try {
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103 ArrayList<String> cmd = new ArrayList<String>(command);
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104 cmd.add(dirName);
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105 CharSequence result = execHelper.exec(cmd);
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106
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107 if (execMatcher.reset(result).find()) {
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108 execs = new HashSet<String>();
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109 do {
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110 execs.add(execMatcher.group(1));
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111 } while (execMatcher.find());
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112 } else {
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113 execs = Collections.emptySet(); // indicate we tried and found nothing
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114 }
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115 if (linkMatcher.reset(result).find()) {
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116 links = new HashMap<String, String>();
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117 do {
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118 links.put(linkMatcher.group(1), linkMatcher.group(2));
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119 } while (linkMatcher.find());
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120 } else {
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121 links = Collections.emptyMap();
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122 }
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123 dir2links.put(dirName, links);
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124 dir2execs.put(dirName, execs);
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125 } catch (InterruptedException ex) {
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126 // try again? ensure not too long? stop right away?
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127 // FIXME EXCEPTIONS
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128 throw new RuntimeException();
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129 } catch (IOException ex) {
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130 // FIXME EXCEPTIONS perhaps, fail silently indicating false for both x and l?
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131 throw new RuntimeException();
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132 }
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133 }
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134 isExec = execs.contains(fileName);
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135 isSymlink = links.containsKey(fileName);
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136 if (isSymlink) {
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137 symlinkValue = links.get(fileName);
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138 } else {
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139 symlinkValue = null;
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140 }
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141 }
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142
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143 public boolean isExecutable() {
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144 return isExec;
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145 }
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146
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147 public boolean isSymlink() {
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148 return isSymlink;
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149 }
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150
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151 public String getSymlinkTarget() {
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152 if (isSymlink) {
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153 return symlinkValue;
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154 }
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155 throw new UnsupportedOperationException();
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156 }
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157 }