Log version and git properties at startup

Author: Donnerbart

build.gradle.kts

@@ -1,6 +1,7 @@
 plugins {
     application
     java
+    alias(libs.plugins.gradle.git.properties)
     alias(libs.plugins.shadow)
 }
 
@@ -34,6 +35,7 @@ dependencies {
 // ********** distribution **********
 
 tasks.shadowJar {
+    dependsOn(tasks.generateGitProperties)
     mergeServiceFiles()
     archiveBaseName = "split-tests-java"
     archiveClassifier = ""
@@ -59,3 +61,16 @@ dependencies {
 tasks.test {
     useJUnitPlatform()
 }
+
+// ********** git properties **********
+
+gitProperties {
+    dotGitDirectory = project.rootProject.layout.projectDirectory.dir(".git")
+    gitPropertiesName = "split-tests-java.properties"
+    keys = listOf("git.branch", "git.commit.id", "git.commit.id.abbrev", "git.commit.time")
+    customProperty("version", version)
+    extProperty = "gitProps"
+}
+tasks.generateGitProperties {
+    outputs.upToDateWhen { false }
+}

gradle/libs.versions.toml

@@ -20,4 +20,5 @@ junit-platform-launcher = { module = "org.junit.platform:junit-platform-launcher
 logback-classic = { module = "ch.qos.logback:logback-classic", version.ref = "logback" }
 
 [plugins]
+gradle-git-properties = { id = "com.gorylenko.gradle-git-properties", version = "2.5.0" }
 shadow = { id = "com.gradleup.shadow", version = "8.3.6" }

src/main/java/de/donnerbart/split/TestSplitMain.java

@@ -9,10 +9,15 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.io.FileInputStream;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.text.SimpleDateFormat;
+import java.time.Instant;
+import java.util.Date;
 import java.util.Objects;
+import java.util.Properties;
 import java.util.function.Consumer;
 
 import static de.donnerbart.split.util.FormatUtil.formatTime;
@@ -46,6 +51,12 @@ public static void main(final @Nullable String @NotNull [] args) throws Exceptio
         if (!validateArguments(arguments, workingDirectory)) {
             exitConsumer.accept(1);
         }
+        final var properties = readProperties();
+        LOG.info("split-tests-java {} (commit: {} on branch: {}) built on {}",
+                properties.getProperty("version", "unknown"),
+                properties.getProperty("git.commit.id.abbrev", "unknown"),
+                properties.getProperty("git.branch", "unknown"),
+                getBuiltTime(properties.getProperty("git.commit.time", "unknown")));
         LOG.info("Split index {} (total: {})", arguments.splitIndex, arguments.splitTotal);
         LOG.info("Working directory: {}", workingDirectory);
         LOG.info("Glob: {}", arguments.glob);
@@ -140,4 +151,22 @@ static int calculateOptimalTotalSplit(final @NotNull Arguments arguments, final
             lastSlowestSplit = slowestSplit;
         }
     }
+
+    private static @NotNull Properties readProperties() throws Exception {
+        final var resource = Thread.currentThread().getContextClassLoader().getResource("split-tests-java.properties");
+        if (resource == null) {
+            throw new IllegalStateException("Cannot find split-tests-java.properties in classpath");
+        }
+        final var properties = new Properties();
+        properties.load(new FileInputStream(resource.getPath()));
+        return properties;
+    }
+
+    private static @NotNull Date getBuiltTime(final @NotNull String dateString) {
+        try {
+            return new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ").parse(dateString);
+        } catch (final Exception e) {
+            return Date.from(Instant.EPOCH);
+        }
+    }
 }