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1 /* |
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2 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 package jdk.incubator.jpackage.internal; |
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26 |
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27 import java.io.BufferedReader; |
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28 import java.io.IOException; |
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29 import java.io.InputStreamReader; |
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30 import java.util.List; |
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31 import java.util.function.Consumer; |
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32 import java.util.function.Supplier; |
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33 import java.util.stream.Collectors; |
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34 import java.util.stream.Stream; |
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35 |
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36 final public class Executor { |
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37 |
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38 Executor() { |
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39 } |
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40 |
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41 Executor setOutputConsumer(Consumer<Stream<String>> v) { |
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42 outputConsumer = v; |
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43 return this; |
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44 } |
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45 |
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46 Executor saveOutput(boolean v) { |
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47 saveOutput = v; |
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48 return this; |
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49 } |
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50 |
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51 Executor setProcessBuilder(ProcessBuilder v) { |
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52 pb = v; |
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53 return this; |
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54 } |
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55 |
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56 Executor setCommandLine(String... cmdline) { |
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57 return setProcessBuilder(new ProcessBuilder(cmdline)); |
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58 } |
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59 |
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60 List<String> getOutput() { |
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61 return output; |
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62 } |
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63 |
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64 Executor executeExpectSuccess() throws IOException { |
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65 int ret = execute(); |
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66 if (0 != ret) { |
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67 throw new IOException( |
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68 String.format("Command %s exited with %d code", |
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69 createLogMessage(pb), ret)); |
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70 } |
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71 return this; |
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72 } |
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73 |
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74 int execute() throws IOException { |
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75 output = null; |
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76 |
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77 boolean needProcessOutput = outputConsumer != null || Log.isVerbose() || saveOutput; |
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78 if (needProcessOutput) { |
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79 pb.redirectErrorStream(true); |
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80 } else { |
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81 // We are not going to read process output, so need to notify |
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82 // ProcessBuilder about this. Otherwise some processes might just |
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83 // hang up (`ldconfig -p`). |
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84 pb.redirectError(ProcessBuilder.Redirect.DISCARD); |
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85 pb.redirectOutput(ProcessBuilder.Redirect.DISCARD); |
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86 } |
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87 |
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88 Log.verbose(String.format("Running %s", createLogMessage(pb))); |
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89 Process p = pb.start(); |
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90 |
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91 if (needProcessOutput) { |
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92 try (var br = new BufferedReader(new InputStreamReader( |
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93 p.getInputStream()))) { |
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94 final List<String> savedOutput; |
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95 // Need to save output if explicitely requested (saveOutput=true) or |
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96 // if will be used used by multiple consumers |
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97 if ((outputConsumer != null && Log.isVerbose()) || saveOutput) { |
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98 savedOutput = br.lines().collect(Collectors.toList()); |
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99 if (saveOutput) { |
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100 output = savedOutput; |
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101 } |
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102 } else { |
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103 savedOutput = null; |
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104 } |
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105 |
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106 Supplier<Stream<String>> outputStream = () -> { |
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107 if (savedOutput != null) { |
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108 return savedOutput.stream(); |
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109 } |
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110 return br.lines(); |
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111 }; |
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112 |
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113 if (Log.isVerbose()) { |
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114 outputStream.get().forEach(Log::verbose); |
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115 } |
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116 |
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117 if (outputConsumer != null) { |
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118 outputConsumer.accept(outputStream.get()); |
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119 } |
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120 |
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121 if (savedOutput == null) { |
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122 // For some processes on Linux if the output stream |
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123 // of the process is opened but not consumed, the process |
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124 // would exit with code 141. |
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125 // It turned out that reading just a single line of process |
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126 // output fixes the problem, but let's process |
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127 // all of the output, just in case. |
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128 br.lines().forEach(x -> {}); |
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129 } |
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130 } |
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131 } |
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132 |
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133 try { |
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134 return p.waitFor(); |
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135 } catch (InterruptedException ex) { |
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136 Log.verbose(ex); |
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137 throw new RuntimeException(ex); |
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138 } |
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139 } |
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140 |
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141 static Executor of(String... cmdline) { |
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142 return new Executor().setCommandLine(cmdline); |
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143 } |
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144 |
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145 static Executor of(ProcessBuilder pb) { |
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146 return new Executor().setProcessBuilder(pb); |
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147 } |
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148 |
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149 private static String createLogMessage(ProcessBuilder pb) { |
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150 StringBuilder sb = new StringBuilder(); |
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151 sb.append(String.format("%s", pb.command())); |
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152 if (pb.directory() != null) { |
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153 sb.append(String.format("in %s", pb.directory().getAbsolutePath())); |
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154 } |
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155 return sb.toString(); |
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156 } |
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157 |
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158 private ProcessBuilder pb; |
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159 private boolean saveOutput; |
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160 private List<String> output; |
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161 private Consumer<Stream<String>> outputConsumer; |
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162 } |