/** Extract a resource from jar, mark it for deletion upon exit, and return its location. */
private static File extractFromJar(
String resource, String fileName, String suffix, File directory) throws IOException {
URL res = Main.class.getResource(resource);
if (res == null) throw new IOException("Unable to find the resource: " + resource);
// put this jar in a file system so that we can load jars from there
File tmp;
try {
tmp = File.createTempFile(fileName, suffix, directory);
} catch (IOException e) {
String tmpdir =
(directory == null) ? System.getProperty("java.io.tmpdir") : directory.getAbsolutePath();
IOException x = new IOException("Jenkins has failed to create a temporary file in " + tmpdir);
x.initCause(e);
throw x;
}
InputStream is = res.openStream();
try {
OutputStream os = new FileOutputStream(tmp);
try {
copyStream(is, os);
} finally {
os.close();
}
} finally {
is.close();
}
tmp.deleteOnExit();
return tmp;
}
/** Figures out the URL of <tt>jenkins.war</tt>. */
public static File whoAmI(File directory) throws IOException, URISyntaxException {
// JNLP returns the URL where the jar was originally placed (like http://jenkins-ci.org/...)
// not the local cached file. So we need a rather round about approach to get to
// the local file name.
// There is no portable way to find where the locally cached copy
// of jenkins.war/jar is; JDK 6 is too smart. (See JENKINS-2326.)
try {
URL classFile = Main.class.getClassLoader().getResource("Main.class");
JarFile jf = ((JarURLConnection) classFile.openConnection()).getJarFile();
Field f = ZipFile.class.getDeclaredField("name");
f.setAccessible(true);
return new File((String) f.get(jf));
} catch (Exception x) {
System.err.println("ZipFile.name trick did not work, using fallback: " + x);
}
File myself = File.createTempFile("jenkins", ".jar", directory);
myself.deleteOnExit();
InputStream is = Main.class.getProtectionDomain().getCodeSource().getLocation().openStream();
try {
OutputStream os = new FileOutputStream(myself);
try {
copyStream(is, os);
} finally {
os.close();
}
} finally {
is.close();
}
return myself;
}
