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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 {
@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);
}
}
@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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