/*
* Copyright (c) 2013, 2014 Oracle and/or its affiliates. All rights reserved. This
* code is released under a tri EPL/GPL/LGPL license. You can use it,
* redistribute it and/or modify it under the terms of the:
*
* Eclipse Public License version 1.0
* GNU General Public License version 2
* GNU Lesser General Public License version 2.1
*/
package org.jruby.truffle.nodes.core;
import java.io.*;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import com.oracle.truffle.api.source.*;
import com.oracle.truffle.api.frame.*;
import org.jruby.truffle.nodes.*;
import org.jruby.truffle.runtime.*;
import org.jruby.truffle.runtime.core.RubyHash;
/**
* Represents an expression that is evaluated by running it as a system command via forking and
* execing, and then taking stdout as a string.
*/
public class SystemNode extends RubyNode {
@Child protected RubyNode child;
public SystemNode(RubyContext context, SourceSection sourceSection, RubyNode child) {
super(context, sourceSection);
this.child = child;
}
@Override
public Object execute(VirtualFrame frame) {
notDesignedForCompilation();
final RubyContext context = getContext();
final RubyHash env = context.getCoreLibrary().getENV();
final List<String> envp = new ArrayList<>();
// TODO(CS): cast
for (Map.Entry<Object, Object> entry : ((LinkedHashMap<Object, Object>) env.getStore()).entrySet()) {
envp.add(entry.getKey().toString() + "=" + entry.getValue().toString());
}
final String command = child.execute(frame).toString();
final Process process;
try {
// We need to run via bash to get the variable and other expansion we expect
process = Runtime.getRuntime().exec(new String[]{"bash", "-c", command}, envp.toArray(new String[envp.size()]));
} catch (IOException e) {
throw new RuntimeException(e);
}
final InputStream stdout = process.getInputStream();
final InputStreamReader reader = new InputStreamReader(stdout);
final StringBuilder resultBuilder = new StringBuilder();
// TODO(cs): this isn't great for binary output
try {
int c;
while ((c = reader.read()) != -1) {
resultBuilder.append((char) c);
}
} catch (IOException e) {
throw new RuntimeException(e);
}
return context.makeString(resultBuilder.toString());
}
}