/**
   * Read the version information from a file with a given file name. The file must be a jar
   * manifest file and all its entries are searched for package names and their specification
   * version information. All information is collected in a map for later lookup of package names
   * and their versions.
   *
   * @param versionFileName name of the jar file containing version information
   */
  public static String readVersionFromFile(String applicationName, String versionFileName) {
    try {
      FileInputStream fileInput = new FileInputStream(versionFileName);
      Manifest manifest = new Manifest();
      manifest.read(fileInput);

      Map entries = manifest.getEntries();
      // Now write out the pre-entry attributes
      Iterator entryIterator = entries.entrySet().iterator();
      while (entryIterator.hasNext()) {
        Map.Entry currentEntry = (Map.Entry) entryIterator.next();
        String packageName = currentEntry.getKey().toString();
        packageName = normalizePackageName(packageName);
        Attributes attributes = (Attributes) currentEntry.getValue();
        String packageSpecVersion = attributes.getValue(Attributes.Name.SPECIFICATION_VERSION);
        packageSpecVersion = extractVersionInfo(packageSpecVersion);
        return packageSpecVersion;
      }
    } catch (IOException exception) {
      exception.printStackTrace();
    }

    // no version found
    return null;
  }
  // optimal side-effects
  private synchronized boolean isSuperMan() throws IOException {

    if (superMan == null) {
      superMan = super.getManifest();
    }

    if (superMan != null) {
      superAttr = superMan.getMainAttributes();
      superEntries = superMan.getEntries();
      return true;
    } else return false;
  }
Exemple #3
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 private static String getVersionString() {
   String findContainingJar = JarManager.findContainingJar(Main.class);
   try {
     StringBuffer buffer = new StringBuffer();
     JarFile jar = new JarFile(findContainingJar);
     final Manifest manifest = jar.getManifest();
     final Map<String, Attributes> attrs = manifest.getEntries();
     Attributes attr = attrs.get("org/apache/pig");
     String version = (String) attr.getValue("Implementation-Version");
     String svnRevision = (String) attr.getValue("Svn-Revision");
     String buildTime = (String) attr.getValue("Build-TimeStamp");
     // we use a version string similar to svn
     // svn, version 1.4.4 (r25188)
     // compiled Sep 23 2007, 22:32:34
     return "Apache Pig version " + version + " (r" + svnRevision + ") \ncompiled " + buildTime;
   } catch (Exception e) {
     throw new RuntimeException("unable to read pigs manifest file", e);
   }
 }
  public String verify(JarFile jar, String... algorithms) throws IOException {
    if (algorithms == null || algorithms.length == 0) algorithms = new String[] {"MD5", "SHA"};
    else if (algorithms.length == 1 && algorithms[0].equals("-")) return null;

    try {
      Manifest m = jar.getManifest();
      if (m.getEntries().isEmpty()) return "No name sections";

      for (Enumeration<JarEntry> e = jar.entries(); e.hasMoreElements(); ) {
        JarEntry je = e.nextElement();
        if (MANIFEST_ENTRY.matcher(je.getName()).matches()) continue;

        Attributes nameSection = m.getAttributes(je.getName());
        if (nameSection == null) return "No name section for " + je.getName();

        for (String algorithm : algorithms) {
          try {
            MessageDigest md = MessageDigest.getInstance(algorithm);
            String expected = nameSection.getValue(algorithm + "-Digest");
            if (expected != null) {
              byte digest[] = Base64.decodeBase64(expected);
              copy(jar.getInputStream(je), md);
              if (!Arrays.equals(digest, md.digest()))
                return "Invalid digest for "
                    + je.getName()
                    + ", "
                    + expected
                    + " != "
                    + Base64.encodeBase64(md.digest());
            } else reporter.error("could not find digest for " + algorithm + "-Digest");
          } catch (NoSuchAlgorithmException nsae) {
            return "Missing digest algorithm " + algorithm;
          }
        }
      }
    } catch (Exception e) {
      return "Failed to verify due to exception: " + e.getMessage();
    }
    return null;
  }
  public Manifest getManifest() throws IOException {

    if (!isSuperMan()) {
      return null;
    }

    Manifest man = new Manifest();
    Attributes attr = man.getMainAttributes();
    attr.putAll((Map) superAttr.clone());

    // now deep copy the manifest entries
    if (superEntries != null) {
      Map entries = man.getEntries();
      Iterator it = superEntries.keySet().iterator();
      while (it.hasNext()) {
        Object key = it.next();
        Attributes at = (Attributes) superEntries.get(key);
        entries.put(key, at.clone());
      }
    }

    return man;
  }