Support building and running Java apps in non-isolated mode

Added new java-non-isolated module and refactored
 scripts/module.py to provide isolated_jvm and non_isolated_jvm as a way to
 build and run java apps in isolated (old default) and non-isolated mode.

The non-isolated mode gets enabled by module.py that detects if selected
 java module (provides = ['java']) has following attribute set to true like so:

non_isolated_jvm = True

Example to build an image with isolated JVM (default):
./scripts/build image=java,java-example

Example to build an image with non-isolated JVM:
./scripts/build image=java-non-isolated,java-example

Fixes #800

Signed-off-by: Waldemar Kozaczuk <jwkozaczuk@gmail.com>
Message-Id: <1476475985-1980-1-git-send-email-jwkozaczuk@gmail.com>

modules/java-non-isolated/Makefile

@@ -0,0 +1,10 @@
+# TODO: need to move compilation of $(java-targets) from the main makefile
+# to here. Unfortunately, compiling with OSv header files is a big mess,
+# and much easier to do it in the main OSv makefile :-(
+SRC = $(shell readlink -f ../..)
+module:
+	cd $(SRC)/java && mvn package -DskipTests=true
+
+clean:
+	cd $(SRC)/java && mvn clean
+	-rm -f dependency-reduced-pom.xml

modules/java-non-isolated/module.py

@@ -0,0 +1,28 @@
+from osv.modules.filemap import FileMap
+from osv.modules import api
+import os, os.path
+
+usr_files = FileMap()
+
+provides = ['java']
+
+non_isolated_jvm = True
+
+api.require('fonts')
+api.require('ca-certificates')
+api.require('libz')
+api.require('josvsym')
+api.require('httpserver-jolokia-plugin')
+api.require('httpserver-jvm-plugin')
+
+jdkdir = os.path.basename(os.path.expandvars('${jdkbase}'))
+
+usr_files.add('${jdkbase}').to('/usr/lib/jvm/java') \
+    .include('lib/**') \
+    .include('jre/**') \
+    .exclude('jre/lib/security/cacerts') \
+    .exclude('jre/lib/audio/**')
+
+usr_files.link('/usr/lib/jvm/' + jdkdir).to('java')
+usr_files.link('/usr/lib/jvm/jre').to('java/jre')
+usr_files.link('/usr/lib/jvm/java/jre/lib/security/cacerts').to('/etc/pki/java/cacerts')

modules/java-non-isolated/usr.manifest

@@ -0,0 +1,21 @@
+#
+# Copyright (C) 2013-2014 Cloudius Systems, Ltd.
+#
+# This work is open source software, licensed under the terms of the
+# BSD license as described in the LICENSE file in the top-level directory.
+#
+
+[manifest]
+/usr/lib/&/libexpat.so.1: %(miscbase)s/usr/lib64/&
+/usr/lib/&/libjpeg.so.62: %(miscbase)s/usr/lib64/&
+/usr/lib/jni/balloon.so: java/jni/balloon.so
+/usr/lib/jni/monitor.so: java/jni/monitor.so
+/usr/lib/&/jni/elf-loader.so: java/&
+/usr/lib/&/jni/networking.so: java/&
+/usr/lib/&/jni/stty.so: java/&
+/usr/lib/&/jni/tracepoint.so: java/&
+/usr/lib/&/jni/power.so: java/&
+/java.so: java/jvm/java_non_isolated.so
+/usr/lib/libosv.so: libosv.so
+/usr/lib/jvm/java/jre/lib/ext/runjava.jar: ${OSV_BASE}/java/runjava/target/runjava.jar
+/java/cloudius.jar: ${OSV_BASE}/java/cloudius/target/cloudius.jar

scripts/module.py

@@ -8,7 +8,7 @@
 from functools import reduce
 from osv.modules import api, resolve, filemap
 
-class jvm(api.basic_app):
+class isolated_jvm(api.basic_app):
     multimain_manifest = '/etc/javamains'
     apps = []
 
@@ -33,6 +33,21 @@ def get_launcher_args(self):
     def add(self, app):
         self.apps.append(app)
 
+    def has_any_app(self):
+        return self.apps
+
+class non_isolated_jvm(api.basic_app):
+    app = None
+
+    def get_launcher_args(self):
+        return ['java.so'] + self.app.get_jvm_args() + self.app.get_multimain_lines()
+
+    def add(self, app):
+        self.app = app
+
+    def has_any_app(self):
+        return self.app
+
 def expand(text, variables):
     def resolve(m):
         name = m.group('name')
@@ -117,7 +132,11 @@ def flatten_list(elememnts):
 
 def get_basic_apps(apps):
     basic_apps = []
-    _jvm = jvm()
+    java = resolve.require('java')
+    if hasattr(java,'non_isolated_jvm') and java.non_isolated_jvm:
+        _jvm = non_isolated_jvm()
+    else:
+        _jvm = isolated_jvm()
 
     for app in flatten_list(apps):
         if isinstance(app, api.basic_app):
@@ -127,7 +146,7 @@ def get_basic_apps(apps):
         else:
             raise Exception("Unknown app type: " + str(app))
 
-    if _jvm.apps:
+    if _jvm.has_any_app():
         basic_apps.append(_jvm)
 
     return basic_apps