--- /dev/null
+<?php
+// {{{ license
+
+// +----------------------------------------------------------------------+
+// | PHP Version 4.0 |
+// +----------------------------------------------------------------------+
+// | Copyright (c) 1997-2003 The PHP Group |
+// +----------------------------------------------------------------------+
+// | This source file is subject to version 2.02 of the PHP license, |
+// | that is bundled with this package in the file LICENSE, and is |
+// | available at through the world-wide-web at |
+// | http://www.php.net/license/2_02.txt. |
+// | If you did not receive a copy of the PHP license and are unable to |
+// | obtain it through the world-wide-web, please send a note to |
+// | license@php.net so we can mail you a copy immediately. |
+// +----------------------------------------------------------------------+
+// | Author: Anders Johannsen <anders@johannsen.com> |
+// | Author: Dan Allen <dan@mojavelinux.com>
+// +----------------------------------------------------------------------+
+
+// $Id: Command.php,v 1.9 2007/04/20 21:08:48 cconstantine Exp $
+
+// }}}
+// {{{ includes
+
+require_once 'PEAR.php';
+require_once 'System.php';
+
+// }}}
+// {{{ constants
+
+define('SYSTEM_COMMAND_OK', 1);
+define('SYSTEM_COMMAND_ERROR', -1);
+define('SYSTEM_COMMAND_NO_SHELL', -2);
+define('SYSTEM_COMMAND_INVALID_SHELL', -3);
+define('SYSTEM_COMMAND_TMPDIR_ERROR', -4);
+define('SYSTEM_COMMAND_INVALID_OPERATOR', -5);
+define('SYSTEM_COMMAND_INVALID_COMMAND', -6);
+define('SYSTEM_COMMAND_OPERATOR_PLACEMENT',-7);
+define('SYSTEM_COMMAND_COMMAND_PLACEMENT', -8);
+define('SYSTEM_COMMAND_NOHUP_MISSING', -9);
+define('SYSTEM_COMMAND_NO_OUTPUT', -10);
+define('SYSTEM_COMMAND_STDERR', -11);
+define('SYSTEM_COMMAND_NONZERO_EXIT', -12);
+
+// }}}
+
+// {{{ class System_Command
+
+/**
+ * The System_Command:: class implements an abstraction for various ways
+ * of executing commands (directly using the backtick operator,
+ * as a background task after the script has terminated using
+ * register_shutdown_function() or as a detached process using nohup).
+ *
+ * @author Anders Johannsen <anders@johannsen.com>
+ * @author Dan Allen <dan@mojavelinux.com>
+ * @version $Revision: 1.9 $
+ */
+
+// }}}
+class System_Command {
+ // {{{ properties
+
+ /**
+ * Array of settings used when creating the shell command
+ *
+ * @var array
+ * @access private
+ */
+ var $options = array();
+
+ /**
+ * Array of available shells to use to execute the command
+ *
+ * @var array
+ * @access private
+ */
+ var $shells = array();
+
+ /**
+ * Array of available control operators used between commands
+ *
+ * @var array
+ * @access private
+ */
+ var $controlOperators = array();
+
+ /**
+ * The system command to be executed
+ *
+ * @var string
+ * @access private
+ */
+ var $systemCommand = null;
+
+ /**
+ * Previously added part to the command string
+ *
+ * @var string
+ * @access private
+ */
+ var $previousElement = null;
+
+ /**
+ * Directory for writing stderr output
+ *
+ * @var string
+ * @access private
+ */
+ var $tmpDir = null;
+
+ /**
+ * To allow the pear error object to accumulate when building
+ * the command, we use the command status to keep track when
+ * a pear error is raised
+ *
+ * @var int
+ * @access private
+ */
+ var $commandStatus = 0;
+
+ /**
+ * Hold initialization PEAR_Error
+ *
+ * @var object
+ * @access private
+ **/
+ var $_initError = null;
+
+ // }}}
+ // {{{ constructor
+
+ /**
+ * Class constructor
+ *
+ * Defines all necessary constants and sets defaults
+ *
+ * @access public
+ */
+ function System_Command($in_shell = null)
+ {
+ // Defining constants
+ $this->options = array(
+ 'SEQUENCE' => true,
+ 'SHUTDOWN' => false,
+ 'SHELL' => $this->which($in_shell),
+ 'OUTPUT' => true,
+ 'NOHUP' => false,
+ 'BACKGROUND' => false,
+ 'STDERR' => false
+ );
+
+ // prepare the available control operators
+ $this->controlOperators = array(
+ 'PIPE' => '|',
+ 'AND' => '&&',
+ 'OR' => '||',
+ 'GROUP' => ';',
+ 'LFIFO' => '<',
+ 'RFIFO' => '>',
+ );
+
+ // List of allowed/available shells
+ $this->shells = array(
+ 'sh',
+ 'bash',
+ 'zsh',
+ 'tcsh',
+ 'csh',
+ 'ash',
+ 'sash',
+ 'esh',
+ 'ksh'
+ );
+
+ // Find the first available shell
+ if (empty($this->options['SHELL'])) {
+ foreach ($this->shells as $shell) {
+ if ($this->options['SHELL'] = $this->which($shell)) {
+ break;
+ }
+ }
+
+ // see if we still have no shell
+ if (empty($this->options['SHELL'])) {
+ $this->_initError =& PEAR::raiseError(null, SYSTEM_COMMAND_NO_SHELL, null, E_USER_WARNING, null, 'System_Command_Error', true);
+ return;
+ }
+ }
+
+ // Caputre a temporary directory for capturing stderr from commands
+ $this->tmpDir = System::tmpdir();
+ if (!System::mkDir("-p {$this->tmpDir}")) {
+ $this->_initError =& PEAR::raiseError(null, SYSTEM_COMMAND_TMPDIR_ERROR, null, E_USER_WARNING, null, 'System_Command_Error', true);
+ return;
+ }
+ }
+
+ // }}}
+ // {{{ setOption()
+
+ /**
+ * Sets the value for an option. Each option should be set to true
+ * or false; except the 'SHELL' option which should be a string
+ * naming a shell. The options are:
+ *
+ * 'SEQUENCE' Allow a sequence command or not (right now this is always on);
+ *
+ * 'SHUTDOWN' Execute commands via a shutdown function;
+ *
+ * 'SHELL' Path to shell;
+ *
+ * 'OUTPUT' Output stdout from process;
+ *
+ * 'NOHUP' Use nohup to detach process;
+ *
+ * 'BACKGROUND' Run as a background process with &;
+ *
+ * 'STDERR' Output on stderr will raise an error, even if
+ * the command's exit value is zero. The output from
+ * stderr can be retrieved using the getDebugInfo()
+ * method of the Pear_ERROR object returned by
+ * execute().;
+ *
+ * @param string $in_option is a case-sensitive string,
+ * corresponding to the option
+ * that should be changed
+ * @param mixed $in_setting is the new value for the option
+ * @access public
+ * @return bool true if succes, else false
+ */
+ function setOption($in_option, $in_setting)
+ {
+ if ($this->_initError) {
+ return $this->_initError;
+ }
+
+ $option = strtoupper($in_option);
+
+ if (!isset($this->options[$option])) {
+ PEAR::raiseError(null, SYSTEM_COMMAND_ERROR, null, E_USER_NOTICE, null, 'System_Command_Error', true);
+ return false;
+ }
+
+ switch ($option) {
+ case 'OUTPUT':
+ case 'SHUTDOWN':
+ case 'SEQUENCE':
+ case 'BACKGROUND':
+ case 'STDERR':
+ $this->options[$option] = !empty($in_setting);
+ return true;
+ break;
+
+ case 'SHELL':
+ if (($shell = $this->which($in_setting)) !== false) {
+ $this->options[$option] = $shell;
+ return true;
+ }
+ else {
+ PEAR::raiseError(null, SYSTEM_COMMAND_NO_SHELL, null, E_USER_NOTICE, $in_setting, 'System_Command_Error', true);
+ return false;
+ }
+ break;
+
+ case 'NOHUP':
+ if (empty($in_setting)) {
+ $this->options[$option] = false;
+ }
+ else if ($location = $this->which('nohup')) {
+ $this->options[$option] = $location;
+ }
+ else {
+ PEAR::raiseError(null, SYSTEM_COMMAND_NOHUP_MISSING, null, E_USER_NOTICE, null, 'System_Command_Error', true);
+ return false;
+ }
+ break;
+ }
+ }
+
+ // }}}
+ // {{{ pushCommand()
+
+ /**
+ * Used to push a command onto the running command to be executed
+ *
+ * @param string $in_command binary to be run
+ * @param string $in_argument either an option or argument value, to be handled appropriately
+ * @param string $in_argument
+ * @param ...
+ *
+ * @access public
+ * @return boolean true on success {or System_Command_Error Exception}
+ */
+ function pushCommand($in_command)
+ {
+ if ($this->_initError) {
+ return $this->_initError;
+ }
+
+ if (!is_null($this->previousElement) && !in_array($this->previousElement, $this->controlOperators)) {
+ $this->commandStatus = -1;
+ $error = PEAR::raiseError(null, SYSTEM_COMMAND_COMMAND_PLACEMENT, null, E_USER_WARNING, null, 'System_Command_Error', true);
+ }
+
+ // check for error here
+ $command = escapeshellcmd($this->which($in_command));
+ if ($command === false) {
+ $error = PEAR::raiseError(null, SYSTEM_COMMAND_INVALID_COMMAND, null, E_USER_WARNING, null, 'System_Command_Error', true);
+ }
+
+ $argv = func_get_args();
+ array_shift($argv);
+ foreach($argv as $arg) {
+ if (strpos($arg, '-') === 0) {
+ $command .= ' ' . $arg;
+ }
+ elseif ($arg != '') {
+ $command .= ' ' . escapeshellarg($arg);
+ }
+ }
+
+ $this->previousElement = $command;
+ $this->systemCommand .= $command;
+
+ return isset($error) ? $error : true;
+ }
+
+ // }}}
+ // {{{ pushOperator()
+
+ /**
+ * Used to push an operator onto the running command to be executed
+ *
+ * @param string $in_operator Either string reprentation of operator or system character
+ *
+ * @access public
+ * @return boolean true on success {or System_Command_Error Exception}
+ */
+ function pushOperator($in_operator)
+ {
+ if ($this->_initError) {
+ return $this->_initError;
+ }
+
+ $operator = isset($this->controlOperators[$in_operator]) ? $this->controlOperators[$in_operator] : $in_operator;
+
+ if (is_null($this->previousElement) || in_array($this->previousElement, $this->controlOperators)) {
+ $this->commandStatus = -1;
+ $error = PEAR::raiseError(null, SYSTEM_COMMAND_OPERATOR_PLACEMENT, null, E_USER_WARNING, null, 'System_Command_Error', true);
+ }
+ elseif (!in_array($operator, $this->controlOperators)) {
+ $this->commandStatus = -1;
+ $error = PEAR::raiseError(null, SYSTEM_COMMAND_INVALID_OPERATOR, null, E_USER_WARNING, $operator, 'System_Command_Error', true);
+ }
+
+ $this->previousElement = $operator;
+ $this->systemCommand .= ' ' . $operator . ' ';
+ return isset($error) ? $error : true;
+ }
+
+ // }}}
+ // {{{ execute()
+
+ /**
+ * Executes the code according to given options
+ *
+ * @return bool true if success {or System_Command_Exception}
+ *
+ * @access public
+ */
+ function execute()
+ {
+ if ($this->_initError) {
+ return $this->_initError;
+ }
+
+ // if the command is empty or if the last element was a control operator, we can't continue
+ if (is_null($this->previousElement) || $this->commandStatus == -1 || in_array($this->previousElement, $this->controlOperators)) {
+ return PEAR::raiseError(null, SYSTEM_COMMAND_INVALID_COMMAND, null, E_USER_WARNING, $this->systemCommand, 'System_Command_Error', true);
+ }
+
+ // Warning about impossible mix of options
+ if (!empty($this->options['OUTPUT'])) {
+ if (!empty($this->options['SHUTDOWN']) || !empty($this->options['NOHUP'])) {
+ return PEAR::raiseError(null, SYSTEM_COMMAND_NO_OUTPUT, null, E_USER_WARNING, null, 'System_Command_Error', true);
+ }
+ }
+
+ // if this is not going to stdout, then redirect to /dev/null
+ if (empty($this->options['OUTPUT'])) {
+ $this->systemCommand .= ' >/dev/null';
+ }
+
+ $suffix = '';
+ // run a command immune to hangups, with output to a non-tty
+ if (!empty($this->options['NOHUP'])) {
+ $this->systemCommand = $this->options['NOHUP'] . $this->systemCommand;
+ }
+ // run a background process (only if not nohup)
+ elseif (!empty($this->options['BACKGROUND'])) {
+ $suffix = ' &';
+ }
+
+ // Register to be run on shutdown
+ if (!empty($this->options['SHUTDOWN'])) {
+ $line = "system(\"{$this->systemCommand}$suffix\");";
+ $function = create_function('', $line);
+ register_shutdown_function($function);
+ return true;
+ }
+ else {
+ // send stderr to a file so that we can reap the error message
+ $tmpFile = tempnam($this->tmpDir, 'System_Command-');
+ $this->systemCommand .= ' 2>' . $tmpFile . $suffix;
+ $shellPipe = $this->which('echo') . ' ' . escapeshellarg($this->systemCommand) . ' | ' . $this->options['SHELL'];
+ exec($shellPipe, $result, $returnVal);
+
+ if ($returnVal !== 0) {
+ // command returned nonzero; that's always an error
+ $return = PEAR::raiseError(null, SYSTEM_COMMAND_NONZERO_EXIT, null, E_USER_WARNING, null, 'System_Command_Error', true);
+ }
+ else if (!$this->options['STDERR']) {
+ // caller does not care about stderr; return success
+ $return = implode("\n", $result);
+ }
+ else {
+ // our caller cares about stderr; check stderr output
+ clearstatcache();
+ if (filesize($tmpFile) > 0) {
+ // the command actually wrote to stderr
+ $stderr_output = file_get_contents($tmpFile);
+ $return = PEAR::raiseError(null, SYSTEM_COMMAND_STDERR, null, E_USER_WARNING, $stderr_output, 'System_Command_Error', true);
+ } else {
+ // total success; return stdout gathered by exec()
+ $return = implode("\n", $result);
+ }
+ }
+
+ unlink($tmpFile);
+ return $return;
+ }
+ }
+
+ // }}}
+ // {{{ which()
+
+ /**
+ * Functionality similiar to unix 'which'. Searches the path
+ * for the specified program.
+ *
+ * @param $cmd name of the executable to search for
+ *
+ * @access private
+ * @return string returns the full path if found, false if not
+ */
+ function which($in_cmd)
+ {
+ // only pass non-empty strings to System::which()
+ if (!is_string($in_cmd) || '' === $in_cmd) {
+ return(false);
+ }
+
+ // explicitly pass false as fallback value
+ return System::which($in_cmd, false);
+ }
+
+ // }}}
+ // {{{ reset()
+
+ /**
+ * Prepare for a new command to be built
+ *
+ * @access public
+ * @return void
+ */
+ function reset()
+ {
+ $this->previousElement = null;
+ $this->systemCommand = null;
+ $this->commandStatus = 0;
+ }
+
+ // }}}
+ // {{{ errorMessage()
+
+ /**
+ * Return a textual error message for a System_Command error code
+ *
+ * @param integer error code
+ *
+ * @return string error message, or false if the error code was
+ * not recognized
+ */
+ function errorMessage($in_value)
+ {
+ static $errorMessages;
+ if (!isset($errorMessages)) {
+ $errorMessages = array(
+ SYSTEM_COMMAND_OK => 'no error',
+ SYSTEM_COMMAND_ERROR => 'unknown error',
+ SYSTEM_COMMAND_NO_SHELL => 'no shell found',
+ SYSTEM_COMMAND_INVALID_SHELL => 'invalid shell',
+ SYSTEM_COMMAND_TMPDIR_ERROR => 'could not create temporary directory',
+ SYSTEM_COMMAND_INVALID_OPERATOR => 'control operator invalid',
+ SYSTEM_COMMAND_INVALID_COMMAND => 'invalid system command',
+ SYSTEM_COMMAND_OPERATOR_PLACEMENT => 'invalid placement of control operator',
+ SYSTEM_COMMAND_COMMAND_PLACEMENT => 'invalid placement of command',
+ SYSTEM_COMMAND_NOHUP_MISSING => 'nohup not found on system',
+ SYSTEM_COMMAND_NO_OUTPUT => 'output not allowed',
+ SYSTEM_COMMAND_STDERR => 'command wrote to stderr',
+ SYSTEM_COMMAND_NONZERO_EXIT => 'non-zero exit value from command',
+ );
+ }
+
+ if (System_Command::isError($in_value)) {
+ $in_value = $in_value->getCode();
+ }
+
+ return isset($errorMessages[$in_value]) ? $errorMessages[$in_value] : $errorMessages[SYSTEM_COMMAND_ERROR];
+ }
+
+ // }}}
+ // {{{ isError()
+
+ /**
+ * Tell whether a result code from a System_Command method is an error
+ *
+ * @param int result code
+ *
+ * @return bool whether $in_value is an error
+ *
+ * @access public
+ */
+ function isError($in_value)
+ {
+ return (is_object($in_value) &&
+ (strtolower(get_class($in_value)) == 'system_command_error' ||
+ is_subclass_of($in_value, 'system_command_error')));
+ }
+
+ // }}}
+}
+
+// {{{ class System_Command_Error
+
+/**
+ * System_Command_Error constructor.
+ *
+ * @param mixed System_Command error code, or string with error message.
+ * @param integer what "error mode" to operate in
+ * @param integer what error level to use for $mode & PEAR_ERROR_TRIGGER
+ * @param mixed additional debug info, such as the last query
+ *
+ * @access public
+ *
+ * @see PEAR_Error
+ */
+
+// }}}
+class System_Command_Error extends PEAR_Error
+{
+ // {{{ properties
+
+ /**
+ * Message in front of the error message
+ * @var string $error_message_prefix
+ */
+ var $error_message_prefix = 'System_Command Error: ';
+
+ // }}}
+ // {{{ constructor
+
+ function System_Command_Error($code = SYSTEM_COMMAND_ERROR, $mode = PEAR_ERROR_RETURN,
+ $level = E_USER_NOTICE, $debuginfo = null)
+ {
+ if (is_int($code)) {
+ $this->PEAR_Error(System_Command::errorMessage($code), $code, $mode, $level, $debuginfo);
+ } else {
+ $this->PEAR_Error("Invalid error code: $code", SYSTEM_COMMAND_ERROR, $mode, $level, $debuginfo);
+ }
+ }
+
+ // }}}
+}
+?>
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