Mercurial > jhg
annotate src/org/tmatesoft/hg/internal/WorkingDirFileWriter.java @ 610:5c68567b3645
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author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Thu, 09 May 2013 21:06:48 +0200 |
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1 /* |
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2 * Copyright (c) 2012-2013 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.internal; |
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18 |
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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.io.FileOutputStream; |
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23 import java.io.IOException; |
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24 import java.nio.ByteBuffer; |
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25 import java.nio.channels.FileChannel; |
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26 |
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27 import org.tmatesoft.hg.repo.HgDataFile; |
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28 import org.tmatesoft.hg.repo.HgManifest; |
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29 import org.tmatesoft.hg.util.ByteChannel; |
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30 import org.tmatesoft.hg.util.CancelledException; |
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31 import org.tmatesoft.hg.util.LogFacility.Severity; |
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32 import org.tmatesoft.hg.util.Path; |
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33 |
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34 /** |
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35 * |
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36 * @author Artem Tikhomirov |
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37 * @author TMate Software Ltd. |
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38 */ |
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39 public class WorkingDirFileWriter implements ByteChannel { |
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40 |
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41 |
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42 private final Internals hgRepo; |
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43 private final boolean execCap, symlinkCap; |
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44 private final FileSystemHelper fileFlagsHelper; |
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45 private File dest; |
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46 private FileChannel destChannel; |
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47 private int totalBytesWritten; |
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48 private ByteArrayChannel linkChannel; |
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49 private int fmode; |
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50 |
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51 public WorkingDirFileWriter(Internals internalRepo) { |
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52 hgRepo = internalRepo; |
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53 execCap = Internals.checkSupportsExecutables(internalRepo.getRepo().getWorkingDir()); |
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54 symlinkCap = Internals.checkSupportsSymlinks(internalRepo.getRepo().getWorkingDir()); |
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55 if (symlinkCap || execCap) { |
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56 fileFlagsHelper = new FileSystemHelper(internalRepo.getSessionContext()); |
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57 } else { |
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58 fileFlagsHelper = null; |
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59 } |
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60 } |
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61 |
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62 /** |
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63 * Writes content of specified file revision into local filesystem, or create a symlink according to flags. |
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64 * Executable bit is set if specified and filesystem supports it. |
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65 */ |
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66 public void processFile(HgDataFile df, int fileRevIndex, HgManifest.Flags flags) throws IOException { |
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67 try { |
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68 prepare(df.getPath()); |
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69 if (flags != HgManifest.Flags.Link) { |
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70 destChannel = new FileOutputStream(dest).getChannel(); |
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71 } else { |
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72 linkChannel = new ByteArrayChannel(); |
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73 } |
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74 df.contentWithFilters(fileRevIndex, this); |
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75 } catch (CancelledException ex) { |
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76 hgRepo.getSessionContext().getLog().dump(getClass(), Severity.Error, ex, "Our impl doesn't throw cancellation"); |
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77 } finally { |
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78 if (flags != HgManifest.Flags.Link) { |
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79 destChannel.close(); |
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80 destChannel = null; |
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81 // leave dest in case anyone enquires with #getDestinationFile |
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82 } |
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83 } |
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84 if (linkChannel != null && symlinkCap) { |
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85 assert flags == HgManifest.Flags.Link; |
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86 fileFlagsHelper.createSymlink(dest.getParentFile(), dest.getName(), linkChannel.toArray()); |
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87 } else if (flags == HgManifest.Flags.Exec && execCap) { |
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88 fileFlagsHelper.setExecutableBit(dest.getParentFile(), dest.getName()); |
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89 } |
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90 // Although HgWCStatusCollector treats 644 (`hg manifest -v`) and 664 (my fs) the same, it's better |
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91 // to detect actual flags here |
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92 fmode = flags.fsMode(); // default to one from manifest |
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93 if (fileFlagsHelper != null) { |
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94 // if neither execBit nor link is supported by fs, it's unlikely file mode is supported, too. |
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95 try { |
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96 fmode = fileFlagsHelper.getFileMode(dest, fmode); |
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97 } catch (IOException ex) { |
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98 // Warn, we've got default value and can live with it |
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99 hgRepo.getSessionContext().getLog().dump(getClass(), Warn, ex, "Failed get file access rights"); |
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100 } |
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101 } |
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102 } |
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103 |
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104 public void prepare(Path fname) throws IOException { |
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105 String fpath = fname.toString(); |
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106 dest = new File(hgRepo.getRepo().getWorkingDir(), fpath); |
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107 if (fpath.indexOf('/') != -1) { |
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108 dest.getParentFile().mkdirs(); |
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109 } |
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110 destChannel = null; |
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111 linkChannel = null; |
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112 totalBytesWritten = 0; |
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113 fmode = 0; |
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114 } |
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115 |
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116 public int write(ByteBuffer buffer) throws IOException, CancelledException { |
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117 final int written; |
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118 if (linkChannel != null) { |
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119 written = linkChannel.write(buffer); |
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120 } else { |
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121 written = destChannel.write(buffer); |
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122 } |
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123 totalBytesWritten += written; |
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124 return written; |
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125 } |
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126 |
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127 /** |
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128 * Information purposes only, to find out trouble location if {@link #processFile(HgDataFile, int)} fails |
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129 */ |
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130 public File getDestinationFile() { |
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131 return dest; |
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132 } |
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133 |
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134 public int bytesWritten() { |
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135 return totalBytesWritten; |
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136 } |
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137 |
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138 public int fmode() { |
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139 return fmode; |
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140 } |
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141 |
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142 public int mtime() { |
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143 return (int) (dest.lastModified() / 1000); |
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144 } |
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145 } |