makeJRE.py

import os
import sys
import io
import subprocess
import argparse

JAVA_HOME = '/usr/lib/jvm/java-11-openjdk-amd64'
JDEPS = os.path.join(JAVA_HOME, 'bin/jdeps')
JLINK = os.path.join(JAVA_HOME, 'bin/jlink')
JMODS_DIR = os.path.join(JAVA_HOME, 'jmods')

parser = argparse.ArgumentParser()
parser.add_argument('target_jar_path', type=str)
parser.add_argument('jre_out_path', type=str)
args = parser.parse_args()

target_jar_path = args.target_jar_path
jre_out_path = args.jre_out_path


print('Resolving dependencies..')
jdeps_cmd = [ JDEPS, '--list-deps', target_jar_path ]

proc = subprocess.run(jdeps_cmd, capture_output=True)
if proc.returncode != 0:
    print('error')
    sys.exit(1)

jdeps_out = proc.stdout.decode('utf-8').strip()


required_modules = []
for line in jdeps_out.split('\n'):
    required_modules.append(line.strip())

print('# Required Module List')
print(required_modules)


print('Creating JRE..')
modules = ','.join(required_modules)
jlink_cmd = [ JLINK, '--compress=2', '--module-path', JMODS_DIR, '--add-modules', modules, '--output', jre_out_path ]

proc = subprocess.run(jlink_cmd)
if proc.returncode != 0:
    print('error')
    sys.exit(1)

print('Done.')