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- /*
- * Copyright (C) 2008, Google Inc. and others
- *
- * This program and the accompanying materials are made available under the
- * terms of the Eclipse Distribution License v. 1.0 which is available at
- * https://www.eclipse.org/org/documents/edl-v10.php.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
- package org.eclipse.jgit.pgm;
-
- import java.io.IOException;
- import java.io.InputStream;
- import java.net.URL;
- import java.net.URLClassLoader;
- import java.text.MessageFormat;
- import java.util.jar.JarFile;
- import java.util.jar.Manifest;
-
- import org.eclipse.jgit.pgm.internal.CLIText;
-
- @Command(common = true, usage = "usage_DisplayTheVersionOfJgit")
- class Version extends TextBuiltin {
- /** {@inheritDoc} */
- @Override
- protected void run() {
- // read the Implementation-Version from Manifest
- String version = getImplementationVersion();
-
- // if Implementation-Version is not available then try reading
- // Bundle-Version
- if (version == null) {
- version = getBundleVersion();
- }
-
- // if both Implementation-Version and Bundle-Version are not available
- // then throw an exception
- if (version == null) {
- throw die(CLIText.get().cannotReadPackageInformation);
- }
-
- try {
- outw.println(
- MessageFormat.format(CLIText.get().jgitVersion, version));
- } catch (IOException e) {
- throw die(e.getMessage(), e);
- }
- }
-
- /** {@inheritDoc} */
- @Override
- protected final boolean requiresRepository() {
- return false;
- }
-
- private String getImplementationVersion() {
- Package pkg = getClass().getPackage();
- return (pkg == null) ? null : pkg.getImplementationVersion();
- }
-
- private String getBundleVersion() {
- ClassLoader cl = getClass().getClassLoader();
- if (cl instanceof URLClassLoader) {
- URL url = ((URLClassLoader) cl).findResource(JarFile.MANIFEST_NAME);
- if (url != null)
- return getBundleVersion(url);
- }
- return null;
- }
-
- private static String getBundleVersion(URL url) {
- try (InputStream is = url.openStream()) {
- Manifest manifest = new Manifest(is);
- return manifest.getMainAttributes().getValue("Bundle-Version"); //$NON-NLS-1$
- } catch (IOException e) {
- // do nothing - will return null
- }
- return null;
- }
- }
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