Gradle: Generate attributes for JAR manifests

apps/ministreaming/build.gradle

@@ -21,6 +21,13 @@ dependencies {
     api project(':core')
 }
 
+jar {
+    manifest {
+        attributes 'Specification-Title': 'I2P Streaming API'
+        attributes 'Implementation-Title': 'I2P Java Streaming API'
+    }
+}
+
 configurations {
     tests
 }

apps/streaming/build.gradle

@@ -23,3 +23,10 @@ dependencies {
     api project(':apps:ministreaming')
     testImplementation project(path: ':apps:ministreaming', configuration: 'tests')
 }
+
+jar {
+    manifest {
+        attributes 'Specification-Title': 'I2P Streaming Implementation'
+        attributes 'Implementation-Title': 'I2P Java Streaming Implementation'
+    }
+}

build.gradle

@@ -32,6 +32,34 @@ String getBuildExtra() {
     buildExtra
 }
 
+String getBuiltBy() {
+    def builtBy
+    file("override.properties").readLines().findAll({ line ->
+        line.contains("build.built-by")
+    }).first().eachMatch('.*=(.*)', {
+        builtBy = it[1]
+    })
+    builtBy
+}
+
+boolean haveMonotone() {
+    file("_MTN").exists()
+}
+
+String getWorkspaceVersion() {
+    if (haveMonotone()) {
+        def stdout = new ByteArrayOutputStream()
+        exec {
+            executable 'mtn'
+            args 'automate', 'get_base_revision_id'
+            standardOutput = stdout
+        }
+        stdout.toString().trim()
+    } else {
+        'unknown'
+    }
+}
+
 String compat(String src) {
     if (src.contains('.')) {
         src.substring(src.lastIndexOf('.') + 1)
@@ -54,6 +82,9 @@ def buildVersion = getBuildVersion()
 def buildExtra = getBuildExtra()
 def fullVersion = "$releaseVersion-$buildVersion$buildExtra"
 
+def builtBy = getBuiltBy()
+def workspaceVersion = getWorkspaceVersion()
+
 // Exclude apps/ dir itself, but include its subdirs
 def javaProjects = subprojects - project(':apps')
 
@@ -73,15 +104,28 @@ configure(javaProjects) {
         testCompile 'org.mockito:mockito-core:2.11.0'
     }
 
-    jar {
-        manifest {
-            attributes 'Implementation-Version': "$fullVersion"
-        }
-    }
-
     sourceCompatibility = 1.7
     targetCompatibility = 1.7
 
+    jar {
+        // Empty attributes are set by each project. They are initialized
+        // here in order to create a defined ordering of the attributes.
+        manifest {
+            attributes 'Specification-Title': ''
+            attributes 'Specification-Version': "$releaseVersion"
+            attributes 'Specification-Vendor': 'The I2P Project https://geti2p.net/'
+            attributes 'Implementation-Title': ''
+            attributes 'Implementation-Version': "$fullVersion"
+            attributes 'Implementation-Vendor': 'The I2P Project https://geti2p.net/'
+            attributes 'Built-By': "$builtBy"
+            attributes 'Build-Date': 'reproducible'
+            attributes 'Base-Revision': "$workspaceVersion"
+            attributes 'Workspace-Changes': ''
+            attributes 'X-Compile-Source-JDK': "$sourceCompatibility"
+            attributes 'X-Compile-Target-JDK': "$targetCompatibility"
+        }
+    }
+
     tasks.withType(AbstractArchiveTask) {
         preserveFileTimestamps = false
         reproducibleFileOrder = true

core/build.gradle

@@ -71,6 +71,14 @@ if (System.getenv("TARGET_JAVA_HOME") == null && JavaVersion.current() != JavaVe
     test.dependsOn scalaTest
 }
 
+jar {
+    manifest {
+        attributes 'Specification-Title': 'I2P Core API'
+        attributes 'Implementation-Title': 'I2P Java Core API'
+        attributes 'Main-Class': 'net.i2p.util.CommandLine'
+    }
+}
+
 configurations {
     tests
 }

history.txt

@@ -2,6 +2,7 @@
  * Gradle:
    - Adjust dependencies to match Tomcat and Jetty updates
    - Generate reproducible archives
+   - Generate attributes for JAR manifests
 
 2019-04-17 zzz
  * Transport: More fixes for NTCP when SSU disabled (ticket #1417)

router/build.gradle

@@ -28,6 +28,9 @@ dependencies {
 
 jar {
     manifest {
+        attributes 'Specification-Title': 'I2P Router'
+        attributes 'Implementation-Title': 'I2P Java Router'
+        attributes 'Main-Class': 'net.i2p.router.CommandLine'
         // so people with very old wrapper.config files will still work with Jetty 6
         attributes 'Class-Path': 'jetty-i2p.jar jetty-java5-threadpool.jar jetty-rewrite-handler.jar jetty-sslengine.jar jetty-start.jar jetty-util.jar'
     }