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13514
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1 /*
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2 * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved. This
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3 * code is released under a tri EPL/GPL/LGPL license. You can use it,
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4 * redistribute it and/or modify it under the terms of the:
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5 *
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6 * Eclipse Public License version 1.0
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7 * GNU General Public License version 2
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8 * GNU Lesser General Public License version 2.1
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9 */
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10 package com.oracle.truffle.ruby.nodes.core;
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11
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12 import java.io.*;
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13
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14 import com.oracle.truffle.api.*;
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15 import com.oracle.truffle.api.frame.*;
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16 import com.oracle.truffle.api.nodes.*;
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17 import com.oracle.truffle.ruby.nodes.*;
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18 import com.oracle.truffle.ruby.runtime.*;
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19
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20 /**
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21 * Represents an expression that is evaluated by running it as a system command via forking and
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22 * execing, and then taking stdout as a string.
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23 */
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24 @NodeInfo(shortName = "system")
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25 public class SystemNode extends RubyNode {
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26
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27 @Child protected RubyNode child;
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28
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29 public SystemNode(RubyContext context, SourceSection sourceSection, RubyNode child) {
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30 super(context, sourceSection);
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31 this.child = adoptChild(child);
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32 }
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33
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34 @Override
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35 public Object execute(VirtualFrame frame) {
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36 final RubyContext context = getContext();
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37
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38 final String command = child.execute(frame).toString();
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39
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40 Process process;
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41
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42 try {
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43 // We need to run via bash to get the variable and other expansion we expect
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44 process = Runtime.getRuntime().exec(new String[]{"bash", "-c", command});
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45 } catch (IOException e) {
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46 throw new RuntimeException(e);
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47 }
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48
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49 final InputStream stdout = process.getInputStream();
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50 final BufferedReader reader = new BufferedReader(new InputStreamReader(stdout));
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51
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52 final StringBuilder resultBuilder = new StringBuilder();
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53
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54 String line;
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55
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56 // TODO(cs): this isn't great for binary output
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57
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58 try {
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59 while ((line = reader.readLine()) != null) {
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60 resultBuilder.append(line);
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61 resultBuilder.append("\n");
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62 }
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63 } catch (IOException e) {
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64 throw new RuntimeException(e);
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65 }
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66
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67 return context.makeString(resultBuilder.toString());
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68 }
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69 }
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