Put build info into manifest

build.gradle

@@ -80,9 +80,20 @@ tasks.withType(Javadoc).configureEach {
     options.addStringOption("Xdoclint:-missing", '-quiet')
 }
 
+
+def gitHash = 'git rev-parse --verify --short HEAD'.execute().text.trim()
+def buildDate = java.time.format.DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss z")
+                        .withZone(ZoneId.of("UTC"))
+                        .format(Instant.now())
+
 jar {
 	manifest {
-		attributes 'Main-Class': application.mainClass
+		attributes(
+			'Main-Class': application.mainClass,
+			'Implementation-Version': project.version,
+			'Revision': "${gitHash}",
+			'Build-Date': "${buildDate}"
+		)
 	}
 }
 

src/io/calimero/Settings.java

@@ -1,6 +1,6 @@
 /*
     Calimero 2 - A library for KNX network access
-    Copyright (c) 2006, 2023 B. Malinowsky
+    Copyright (c) 2006, 2024 B. Malinowsky
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -36,6 +36,8 @@
 
 package io.calimero;
 
+import io.calimero.internal.Manifest;
+
 /**
  * General settings used in Calimero as well as library user information.
  *
@@ -49,7 +51,7 @@ public final class Settings
 
 	private static final String tuwien = "Vienna University of Technology";
 	private static final String group = "Automation Systems Group";
-	private static final String copyright = "Copyright © 2006-2023";
+	private static final String copyright = "Copyright © 2006-2024";
 
 	// just use newline, it's easier to deal with
 	private static final String sep = "\n";
@@ -67,6 +69,7 @@ private Settings() {}
 	 */
 	public static String getLibraryVersion()
 	{
+		// don't use Manifest version here, it's the fallback value
 		return version;
 	}
 
@@ -85,8 +88,8 @@ public static String getLibraryVersion()
 	public static String getLibraryHeader(final boolean verbose)
 	{
 		if (!verbose)
-			return library + " " + version;
-		return library + " version " + version + " - " + desc + sep
+			return library + " " + Manifest.buildInfo(Settings.class);
+		return library + " " + Manifest.buildInfo(Settings.class) + " - " + desc + sep
 				+ group + ", " + tuwien + sep
 				+ copyright;
 	}

src/io/calimero/internal/Manifest.java

@@ -0,0 +1,72 @@
+/*
+    Calimero 2 - A library for KNX network access
+    Copyright (c) 2024, 2024 B. Malinowsky
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+    Linking this library statically or dynamically with other modules is
+    making a combined work based on this library. Thus, the terms and
+    conditions of the GNU General Public License cover the whole
+    combination.
+
+    As a special exception, the copyright holders of this library give you
+    permission to link this library with independent modules to produce an
+    executable, regardless of the license terms of these independent
+    modules, and to copy and distribute the resulting executable under terms
+    of your choice, provided that you also meet, for each linked independent
+    module, the terms and conditions of the license of that module. An
+    independent module is a module which is not derived from or based on
+    this library. If you modify this library, you may extend this exception
+    to your version of the library, but you are not obligated to do so. If
+    you do not wish to do so, delete this exception statement from your
+    version.
+*/
+
+package io.calimero.internal;
+
+import java.io.IOException;
+import java.util.Optional;
+import java.util.jar.Attributes.Name;
+
+import io.calimero.Settings;
+
+public final class Manifest {
+
+	public record BuildInfo(String version, Optional<String> revision, Optional<String> buildDate) {
+		@Override
+		public String toString() {
+			return version + revision.map(r -> " (" + r + ")").orElse("");
+		}
+	}
+
+	private Manifest() {}
+
+	public static BuildInfo buildInfo(final Class<?> lookup) {
+		String version = Settings.getLibraryVersion();
+		String revision = null;
+		String buildDate = null;
+		try (final var metaInf = lookup.getResourceAsStream("/META-INF/MANIFEST.MF")) {
+			if (metaInf != null) {
+				final var manifest = new java.util.jar.Manifest(metaInf);
+				final var attributes = manifest.getMainAttributes();
+				version = attributes.getValue(Name.IMPLEMENTATION_VERSION);
+				revision = attributes.getValue("Revision");
+				buildDate = attributes.getValue("Build-Date");
+			}
+		}
+		catch (IOException | RuntimeException ignore) {}
+		return new BuildInfo(version, Optional.ofNullable(revision), Optional.ofNullable(buildDate));
+	}
+}