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---
layout: default
class: Macro
title: system_allow_fail ';' STRING ( ';' STRING )?
summary: Execute a system command but ignore any failures
---
public String _system(String args[]) throws Exception {
return system_internal(false, args);
}
public String _system_allow_fail(String args[]) throws Exception {
String result = "";
try {
result = system_internal(true, args);
}
catch (Throwable t) {
/* ignore */
}
return result;
}
/**
* System command. Execute a command and insert the result.
*
* @param args
* @param help
* @param patterns
* @param low
* @param high
*/
public String system_internal(boolean allowFail, String args[]) throws Exception {
if (nosystem)
throw new RuntimeException("Macros in this mode cannot excute system commands");
verifyCommand(args, "${" + (allowFail ? "system-allow-fail" : "system")
+ ";<command>[;<in>]}, execute a system command", null, 2, 3);
String command = args[1];
String input = null;
if (args.length > 2) {
input = args[2];
}
if ( File.separatorChar == '\\')
command = "cmd /c \"" + command + "\"";
Process process = Runtime.getRuntime().exec(command, null, domain.getBase());
if (input != null) {
process.getOutputStream().write(input.getBytes("UTF-8"));
}
process.getOutputStream().close();
String s = IO.collect(process.getInputStream(), "UTF-8");
int exitValue = process.waitFor();
if (exitValue != 0)
return exitValue + "";
if (exitValue != 0) {
if (!allowFail) {
domain.error("System command " + command + " failed with exit code " + exitValue);
} else {
domain.warning("System command " + command + " failed with exit code " + exitValue + " (allowed)");
}
}
return s.trim();
}
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