gradle: Use gpg-agent for signing

build.gradle

@@ -289,23 +289,6 @@ configure (junit4Projects) {
 	}
 }
 
-gradle.taskGraph.whenReady { taskGraph ->
-	if (signingRequired
-		&& taskGraph.allTasks.any { it instanceof Sign }) {
-		// Use Java 6's console to read from the console (no good for a CI environment)
-		def console = System.console()
-		if (console == null) {
-			throw new Exception("Could not obtain system console (Console is 'null'). Did you build with gradle daemon? Try the same Gradle command with \"--no-daemon\".")
-		}
-		console.printf '\n\nWe have to sign some things in this build.\n\nPlease enter your signing details.\n\n'
-		def password = console.readPassword('GnuPG Private Key Password: ')
-
-		allprojects { ext.'signing.password' = password }
-
-		console.printf '\nThanks.\n\n'
-	}
-}
-
 task copyAllJavadocDocFiles(type: Copy) {
 	from javadocAllProjects.collect { project ->
 		"${project.projectDir}/src/javadoc" }
@@ -502,6 +485,7 @@ subprojects {
 		}
 	}
 	signing {
+		useGpgCmd()
 		required { signingRequired }
 		sign configurations.archives
 	}