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package cbt;
import java.io.*;
import java.lang.reflect.*;
import java.net.*;
import java.nio.*;
import java.nio.file.*;
import java.security.*;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import javax.xml.bind.annotation.adapters.HexBinaryAdapter;
/**
* This launcher allows to start the JVM without loading anything else permanently into its
* classpath except for the launcher itself. That's why it is written in Java without
* dependencies outside the JDK.
*/
public class NailgunLauncher{
/**
* Persistent cache for caching classloaders for the JVM life time. Can be used as needed by user
* code to improve startup time.
*/
public static ConcurrentHashMap<String, Object> classLoaderCacheKeys = new ConcurrentHashMap<String,Object>();
public static ConcurrentHashMap<Object, ClassLoader> classLoaderCacheValues = new ConcurrentHashMap<Object,ClassLoader>();
public static SecurityManager defaultSecurityManager = System.getSecurityManager();
public static String CBT_HOME = System.getenv("CBT_HOME");
public static String NAILGUN = System.getenv("NAILGUN");
public static String STAGE1 = CBT_HOME + "/stage1/";
public static String TARGET = System.getenv("TARGET");
public static String SCALA_VERSION = "2.11.8";
public static void _assert(Boolean condition, Object msg){
if(!condition){
throw new AssertionError("Assertion failed: "+msg);
}
}
public static void main(String[] args) throws ClassNotFoundException,
NoSuchMethodException,
IllegalAccessException,
InvocationTargetException,
MalformedURLException,
IOException,
NoSuchAlgorithmException {
_assert(CBT_HOME != null, CBT_HOME);
_assert(NAILGUN != null, NAILGUN);
_assert(TARGET != null, TARGET);
_assert(STAGE1 != null, STAGE1);
File f2 = new File(STAGE1);
_assert(f2.listFiles() != null, f2);
long lastCompiled = new File(STAGE1 + TARGET + "/cbt/Stage1.class").lastModified();
for( File file: f2.listFiles() ){
if( file.isFile() && file.toString().endsWith(".scala")
&& file.lastModified() > lastCompiled ){
EarlyDependency[] dependencies = new EarlyDependency[]{
EarlyDependency.scala("library", "DDD5A8BCED249BEDD86FB4578A39B9FB71480573"),
EarlyDependency.scala("compiler","FE1285C9F7B58954C5EF6D80B59063569C065E9A"),
EarlyDependency.scala("reflect", "B74530DEEBA742AB4F3134DE0C2DA0EDC49CA361"),
new EarlyDependency("org/scala-lang/modules/scala-xml_2.11/1.0.5", "scala-xml_2.11-1.0.5", "77ac9be4033768cf03cc04fbd1fc5e5711de2459")
};
ArrayList<String> scalaClassPath = new ArrayList<String>();
for (EarlyDependency d: dependencies) {
download( d.url, d.path, d.hash );
scalaClassPath.add( d.path.toString() );
}
File stage1ClassFiles = new File(STAGE1 + TARGET + "/cbt/");
if( stage1ClassFiles.exists() ){
for( File f: stage1ClassFiles.listFiles() ){
if( f.toString().endsWith(".class") ){
f.delete();
}
}
}
new File(STAGE1 + TARGET).mkdirs();
String s = File.pathSeparator;
ArrayList<String> scalacArgsList = new ArrayList<String>(
Arrays.asList(
new String[]{
"-deprecation", "-feature",
"-cp", String.join( s, scalaClassPath.toArray(new String[scalaClassPath.size()])) + s + NAILGUN+TARGET,
"-d", STAGE1+TARGET
}
)
);
for( File f: new File(STAGE1).listFiles() ){
if( f.isFile() && f.toString().endsWith(".scala") ){
scalacArgsList.add( f.toString() );
}
}
ArrayList<URL> urls = new ArrayList<URL>();
for( String c: scalaClassPath ){
urls.add(new URL("file:"+c));
}
ClassLoader cl = new CbtURLClassLoader( (URL[]) urls.toArray(new URL[urls.size()]) );
cl.loadClass("scala.tools.nsc.Main")
.getMethod("main", String[].class)
.invoke( null/* _cls.newInstance()*/, (Object) scalacArgsList.toArray(new String[scalacArgsList.size()]));
break;
}
}
String library = CBT_HOME+"/cache/maven/org/scala-lang/scala-library/"+SCALA_VERSION+"/scala-library-"+SCALA_VERSION+".jar";
if(!classLoaderCacheKeys.containsKey(library)){
Object libraryKey = new Object();
classLoaderCacheKeys.put(library,libraryKey);
ClassLoader libraryClassLoader = new CbtURLClassLoader( new URL[]{ new URL("file:"+library) } );
classLoaderCacheValues.put(libraryKey, libraryClassLoader);
String xml = CBT_HOME+"/cache/maven/org/scala-lang/modules/scala-xml_2.11/1.0.5/scala-xml_2.11-1.0.5.jar";
Object xmlKey = new Object();
classLoaderCacheKeys.put(xml,xmlKey);
ClassLoader xmlClassLoader = new CbtURLClassLoader(
new URL[]{ new URL("file:"+xml) },
libraryClassLoader
);
classLoaderCacheValues.put(xmlKey, xmlClassLoader);
Object nailgunKey = new Object();
classLoaderCacheKeys.put(NAILGUN+TARGET,nailgunKey);
ClassLoader nailgunClassLoader = new CbtURLClassLoader(
new URL[]{ new URL("file:"+NAILGUN+TARGET) },
xmlClassLoader
);
classLoaderCacheValues.put(nailgunKey, nailgunClassLoader);
}
if(args[0].equals("check-alive")){
System.exit(33);
return;
}
ClassLoader cl = new CbtURLClassLoader(
new URL[]{ new URL("file:"+STAGE1+TARGET) },
classLoaderCacheValues.get(
classLoaderCacheKeys.get( NAILGUN+TARGET )
)
);
try{
cl.loadClass("cbt.Stage1")
.getMethod("main", String[].class, ClassLoader.class)
.invoke( null/* _cls.newInstance()*/, (Object) args, cl);
}catch(ClassNotFoundException e){
System.err.println(cl);
throw e;
}catch(NoClassDefFoundError e){
System.err.println(cl);
throw e;
}catch(InvocationTargetException e){
System.err.println(cl);
throw e;
}
}
public static void download(URL urlString, Path target, String sha1) throws IOException, NoSuchAlgorithmException {
final Path unverified = Paths.get(target+".unverified");
if(!Files.exists(target)) {
new File(target.toString()).getParentFile().mkdirs();
System.err.println("downloading " + urlString);
System.err.println("to " + target);
final InputStream stream = urlString.openStream();
Files.copy(stream, unverified, StandardCopyOption.REPLACE_EXISTING);
stream.close();
final String checksum = sha1(Files.readAllBytes(unverified));
if(sha1 == null || sha1.toUpperCase().equals(checksum)) {
Files.move(unverified, target, StandardCopyOption.REPLACE_EXISTING, StandardCopyOption.ATOMIC_MOVE);
} else {
System.err.println(target + " checksum does not match.\nExpected: |" + sha1 + "|\nFound: |" + checksum + "|");
System.exit(1);
}
}
}
public static String sha1(byte[] bytes) throws NoSuchAlgorithmException {
final MessageDigest sha1 = MessageDigest.getInstance("SHA1");
sha1.update(bytes, 0, bytes.length);
return (new HexBinaryAdapter()).marshal(sha1.digest());
}
}
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