<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <[email protected]>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Process;
use Symfony\Component\Process\Exception\InvalidArgumentException;
use Symfony\Component\Process\Exception\LogicException;
use Symfony\Component\Process\Exception\ProcessFailedException;
use Symfony\Component\Process\Exception\ProcessSignaledException;
use Symfony\Component\Process\Exception\ProcessTimedOutException;
use Symfony\Component\Process\Exception\RuntimeException;
use Symfony\Component\Process\Pipes\PipesInterface;
use Symfony\Component\Process\Pipes\UnixPipes;
use Symfony\Component\Process\Pipes\WindowsPipes;
/**
* Process is a thin wrapper around proc_* functions to easily
* start independent PHP processes.
*
* @author Fabien Potencier <[email protected]>
* @author Romain Neutron <[email protected]>
*/
class Process implements \IteratorAggregate
{
const ERR = 'err';
const OUT = 'out';
const STATUS_READY = 'ready';
const STATUS_STARTED = 'started';
const STATUS_TERMINATED = 'terminated';
const STDIN = 0;
const STDOUT = 1;
const STDERR = 2;
// Timeout Precision in seconds.
const TIMEOUT_PRECISION = 0.2;
const ITER_NON_BLOCKING = 1; // By default, iterating over outputs is a blocking call, use this flag to make it non-blocking
const ITER_KEEP_OUTPUT = 2; // By default, outputs are cleared while iterating, use this flag to keep them in memory
const ITER_SKIP_OUT = 4; // Use this flag to skip STDOUT while iterating
const ITER_SKIP_ERR = 8; // Use this flag to skip STDERR while iterating
private $callback;
private $hasCallback = false;
private $commandline;
private $cwd;
private $env;
private $input;
private $starttime;
private $lastOutputTime;
private $timeout;
private $idleTimeout;
private $exitcode;
private $fallbackStatus = [];
private $processInformation;
private $outputDisabled = false;
private $stdout;
private $stderr;
private $process;
private $status = self::STATUS_READY;
private $incrementalOutputOffset = 0;
private $incrementalErrorOutputOffset = 0;
private $tty = false;
private $pty;
private $useFileHandles = false;
/** @var PipesInterface */
private $processPipes;
private $latestSignal;
private static $sigchild;
/**
* Exit codes translation table.
*
* User-defined errors must use exit codes in the 64-113 range.
*/
public static $exitCodes = [
0 => 'OK',
1 => 'General error',
2 => 'Misuse of shell builtins',
126 => 'Invoked command cannot execute',
127 => 'Command not found',
128 => 'Invalid exit argument',
// signals
129 => 'Hangup',
130 => 'Interrupt',
131 => 'Quit and dump core',
132 => 'Illegal instruction',
133 => 'Trace/breakpoint trap',
134 => 'Process aborted',
135 => 'Bus error: "access to undefined portion of memory object"',
136 => 'Floating point exception: "erroneous arithmetic operation"',
137 => 'Kill (terminate immediately)',
138 => 'User-defined 1',
139 => 'Segmentation violation',
140 => 'User-defined 2',
141 => 'Write to pipe with no one reading',
142 => 'Signal raised by alarm',
143 => 'Termination (request to terminate)',
// 144 - not defined
145 => 'Child process terminated, stopped (or continued*)',
146 => 'Continue if stopped',
147 => 'Stop executing temporarily',
148 => 'Terminal stop signal',
149 => 'Background process attempting to read from tty ("in")',
150 => 'Background process attempting to write to tty ("out")',
151 => 'Urgent data available on socket',
152 => 'CPU time limit exceeded',
153 => 'File size limit exceeded',
154 => 'Signal raised by timer counting virtual time: "virtual timer expired"',
155 => 'Profiling timer expired',
// 156 - not defined
157 => 'Pollable event',
// 158 - not defined
159 => 'Bad syscall',
];
/**
* @param array $command The command to run and its arguments listed as separate entries
* @param string|null $cwd The working directory or null to use the working dir of the current PHP process
* @param array|null $env The environment variables or null to use the same environment as the current PHP process
* @param mixed|null $input The input as stream resource, scalar or \Traversable, or null for no input
* @param int|float|null $timeout The timeout in seconds or null to disable
*
* @throws RuntimeException When proc_open is not installed
*/
public function __construct($command, string $cwd = null, array $env = null, $input = null, ?float $timeout = 60)
{
if (!\function_exists('proc_open')) {
throw new LogicException('The Process class relies on proc_open, which is not available on your PHP installation.');
}
if (!\is_array($command)) {
@trigger_error(sprintf('Passing a command as string when creating a "%s" instance is deprecated since Symfony 4.2, pass it as an array of its arguments instead, or use the "Process::fromShellCommandline()" constructor if you need features provided by the shell.', __CLASS__), E_USER_DEPRECATED);
}
$this->commandline = $command;
$this->cwd = $cwd;
// on Windows, if the cwd changed via chdir(), proc_open defaults to the dir where PHP was started
// on Gnu/Linux, PHP builds with --enable-maintainer-zts are also affected
// @see : https://bugs.php.net/51800
// @see : https://bugs.php.net/50524
if (null === $this->cwd && (\defined('ZEND_THREAD_SAFE') || '\\' === \DIRECTORY_SEPARATOR)) {
$this->cwd = getcwd();
}
if (null !== $env) {
$this->setEnv($env);
}
$this->setInput($input);
$this->setTimeout($timeout);
$this->useFileHandles = '\\' === \DIRECTORY_SEPARATOR;
$this->pty = false;
}
/**
* Creates a Process instance as a command-line to be run in a shell wrapper.
*
* Command-lines are parsed by the shell of your OS (/bin/sh on Unix-like, cmd.exe on Windows.)
* This allows using e.g. pipes or conditional execution. In this mode, signals are sent to the
* shell wrapper and not to your commands.
*
* In order to inject dynamic values into command-lines, we strongly recommend using placeholders.
* This will save escaping values, which is not portable nor secure anyway:
*
* $process = Process::fromShellCommandline('my_command "$MY_VAR"');
* $process->run(null, ['MY_VAR' => $theValue]);
*
* @param string $command The command line to pass to the shell of the OS
* @param string|null $cwd The working directory or null to use the working dir of the current PHP process
* @param array|null $env The environment variables or null to use the same environment as the current PHP process
* @param mixed|null $input The input as stream resource, scalar or \Traversable, or null for no input
* @param int|float|null $timeout The timeout in seconds or null to disable
*
* @return static
*
* @throws RuntimeException When proc_open is not installed
*/
public static function fromShellCommandline(string $command, string $cwd = null, array $env = null, $input = null, ?float $timeout = 60)
{
$process = new static([], $cwd, $env, $input, $timeout);
$process->commandline = $command;
return $process;
}
public function __destruct()
{
$this->stop(0);
}
public function __clone()
{
$this->resetProcessData();
}
/**
* Runs the process.
*
* The callback receives the type of output (out or err) and
* some bytes from the output in real-time. It allows to have feedback
* from the independent process during execution.
*
* The STDOUT and STDERR are also available after the process is finished
* via the getOutput() and getErrorOutput() methods.
*
* @param callable|null $callback A PHP callback to run whenever there is some
* output available on STDOUT or STDERR
*
* @return int The exit status code
*
* @throws RuntimeException When process can't be launched
* @throws RuntimeException When process stopped after receiving signal
* @throws LogicException In case a callback is provided and output has been disabled
*
* @final
*/
public function run(callable $callback = null, array $env = []): int
{
$this->start($callback, $env);
return $this->wait();
}
/**
* Runs the process.
*
* This is identical to run() except that an exception is thrown if the process
* exits with a non-zero exit code.
*
* @return $this
*
* @throws ProcessFailedException if the process didn't terminate successfully
*
* @final
*/
public function mustRun(callable $callback = null, array $env = []): self
{
if (0 !== $this->run($callback, $env)) {
throw new ProcessFailedException($this);
}
return $this;
}
/**
* Starts the process and returns after writing the input to STDIN.
*
* This method blocks until all STDIN data is sent to the process then it
* returns while the process runs in the background.
*
* The termination of the process can be awaited with wait().
*
* The callback receives the type of output (out or err) and some bytes from
* the output in real-time while writing the standard input to the process.
* It allows to have feedback from the independent process during execution.
*
* @param callable|null $callback A PHP callback to run whenever there is some
* output available on STDOUT or STDERR
*
* @throws RuntimeException When process can't be launched
* @throws RuntimeException When process is already running
* @throws LogicException In case a callback is provided and output has been disabled
*/
public function start(callable $callback = null, array $env = [])
{
if ($this->isRunning()) {
throw new RuntimeException('Process is already running');
}
$this->resetProcessData();
$this->starttime = $this->lastOutputTime = microtime(true);
$this->callback = $this->buildCallback($callback);
$this->hasCallback = null !== $callback;
$descriptors = $this->getDescriptors();
if ($this->env) {
$env += $this->env;
}
$env += $this->getDefaultEnv();
if (\is_array($commandline = $this->commandline)) {
$commandline = implode(' ', array_map([$this, 'escapeArgument'], $commandline));
if ('\\' !== \DIRECTORY_SEPARATOR) {
// exec is mandatory to deal with sending a signal to the process
$commandline = 'exec '.$commandline;
}
} else {
$commandline = $this->replacePlaceholders($commandline, $env);
}
$options = ['suppress_errors' => true];
if ('\\' === \DIRECTORY_SEPARATOR) {
$options['bypass_shell'] = true;
$commandline = $this->prepareWindowsCommandLine($commandline, $env);
} elseif (!$this->useFileHandles && $this->isSigchildEnabled()) {
// last exit code is output on the fourth pipe and caught to work around --enable-sigchild
$descriptors[3] = ['pipe', 'w'];
// See https://unix.stackexchange.com/questions/71205/background-process-pipe-input
$commandline = '{ ('.$commandline.') <&3 3<&- 3>/dev/null & } 3<&0;';
$commandline .= 'pid=$!; echo $pid >&3; wait $pid; code=$?; echo $code >&3; exit $code';
// Workaround for the bug, when PTS functionality is enabled.
// @see : https://bugs.php.net/69442
$ptsWorkaround = fopen(__FILE__, 'r');
}
$envPairs = [];
foreach ($env as $k => $v) {
if (false !== $v) {
$envPairs[] = $k.'='.$v;
}
}
if (!is_dir($this->cwd)) {
throw new RuntimeException(sprintf('The provided cwd "%s" does not exist.', $this->cwd));
}
$this->process = proc_open($commandline, $descriptors, $this->processPipes->pipes, $this->cwd, $envPairs, $options);
if (!\is_resource($this->process)) {
throw new RuntimeException('Unable to launch a new process.');
}
$this->status = self::STATUS_STARTED;
if (isset($descriptors[3])) {
$this->fallbackStatus['pid'] = (int) fgets($this->processPipes->pipes[3]);
}
if ($this->tty) {
return;
}
$this->updateStatus(false);
$this->checkTimeout();
}
/**
* Restarts the process.
*
* Be warned that the process is cloned before being started.
*
* @param callable|null $callback A PHP callback to run whenever there is some
* output available on STDOUT or STDERR
*
* @return static
*
* @throws RuntimeException When process can't be launched
* @throws RuntimeException When process is already running
*
* @see start()
*
* @final
*/
public function restart(callable $callback = null, array $env = []): self
{
if ($this->isRunning()) {
throw new RuntimeException('Process is already running');
}
$process = clone $this;
$process->start($callback, $env);
return $process;
}
/**
* Waits for the process to terminate.
*
* The callback receives the type of output (out or err) and some bytes
* from the output in real-time while writing the standard input to the process.
* It allows to have feedback from the independent process during execution.
*
* @param callable|null $callback A valid PHP callback
*
* @return int The exitcode of the process
*
* @throws RuntimeException When process timed out
* @throws RuntimeException When process stopped after receiving signal
* @throws LogicException When process is not yet started
*/
public function wait(callable $callback = null)
{
$this->requireProcessIsStarted(__FUNCTION__);
$this->updateStatus(false);
if (null !== $callback) {
if (!$this->processPipes->haveReadSupport()) {
$this->stop(0);
throw new \LogicException('Pass the callback to the "Process::start" method or call enableOutput to use a callback with "Process::wait"');
}
$this->callback = $this->buildCallback($callback);
}
do {
$this->checkTimeout();
$running = '\\' === \DIRECTORY_SEPARATOR ? $this->isRunning() : $this->processPipes->areOpen();
$this->readPipes($running, '\\' !== \DIRECTORY_SEPARATOR || !$running);
} while ($running);
while ($this->isRunning()) {
$this->checkTimeout();
usleep(1000);
}
if ($this->processInformation['signaled'] && $this->processInformation['termsig'] !== $this->latestSignal) {
throw new ProcessSignaledException($this);
}
return $this->exitcode;
}
/**
* Waits until the callback returns true.
*
* The callback receives the type of output (out or err) and some bytes
* from the output in real-time while writing the standard input to the process.
* It allows to have feedback from the independent process during execution.
*
* @throws RuntimeException When process timed out
* @throws LogicException When process is not yet started
*/
public function waitUntil(callable $callback): bool
{
$this->requireProcessIsStarted(__FUNCTION__);
$this->updateStatus(false);
if (!$this->processPipes->haveReadSupport()) {
$this->stop(0);
throw new \LogicException('Pass the callback to the "Process::start" method or call enableOutput to use a callback with "Process::waitUntil".');
}
$callback = $this->buildCallback($callback);
$ready = false;
while (true) {
$this->checkTimeout();
$running = '\\' === \DIRECTORY_SEPARATOR ? $this->isRunning() : $this->processPipes->areOpen();
$output = $this->processPipes->readAndWrite($running, '\\' !== \DIRECTORY_SEPARATOR || !$running);
foreach ($output as $type => $data) {
if (3 !== $type) {
$ready = $callback(self::STDOUT === $type ? self::OUT : self::ERR, $data) || $ready;
} elseif (!isset($this->fallbackStatus['signaled'])) {
$this->fallbackStatus['exitcode'] = (int) $data;
}
}
if ($ready) {
return true;
}
if (!$running) {
return false;
}
usleep(1000);
}
}
/**
* Returns the Pid (process identifier), if applicable.
*
* @return int|null The process id if running, null otherwise
*/
public function getPid()
{
return $this->isRunning() ? $this->processInformation['pid'] : null;
}
/**
* Sends a POSIX signal to the process.
*
* @param int $signal A valid POSIX signal (see https://php.net/pcntl.constants)
*
* @return $this
*
* @throws LogicException In case the process is not running
* @throws RuntimeException In case --enable-sigchild is activated and the process can't be killed
* @throws RuntimeException In case of failure
*/
public function signal($signal)
{
$this->doSignal($signal, true);
return $this;
}
/**
* Disables fetching output and error output from the underlying process.
*
* @return $this
*
* @throws RuntimeException In case the process is already running
* @throws LogicException if an idle timeout is set
*/
public function disableOutput()
{
if ($this->isRunning()) {
throw new RuntimeException('Disabling output while the process is running is not possible.');
}
if (null !== $this->idleTimeout) {
throw new LogicException('Output can not be disabled while an idle timeout is set.');
}
$this->outputDisabled = true;
return $this;
}
/**
* Enables fetching output and error output from the underlying process.
*
* @return $this
*
* @throws RuntimeException In case the process is already running
*/
public function enableOutput()
{
if ($this->isRunning()) {
throw new RuntimeException('Enabling output while the process is running is not possible.');
}
$this->outputDisabled = false;
return $this;
}
/**
* Returns true in case the output is disabled, false otherwise.
*
* @return bool
*/
public function isOutputDisabled()
{
return $this->outputDisabled;
}
/**
* Returns the current output of the process (STDOUT).
*
* @return string The process output
*
* @throws LogicException in case the output has been disabled
* @throws LogicException In case the process is not started
*/
public function getOutput()
{
$this->readPipesForOutput(__FUNCTION__);
if (false === $ret = stream_get_contents($this->stdout, -1, 0)) {
return '';
}
return $ret;
}
/**
* Returns the output incrementally.
*
* In comparison with the getOutput method which always return the whole
* output, this one returns the new output since the last call.
*
* @return string The process output since the last call
*
* @throws LogicException in case the output has been disabled
* @throws LogicException In case the process is not started
*/
public function getIncrementalOutput()
{
$this->readPipesForOutput(__FUNCTION__);
$latest = stream_get_contents($this->stdout, -1, $this->incrementalOutputOffset);
$this->incrementalOutputOffset = ftell($this->stdout);
if (false === $latest) {
return '';
}
return $latest;
}
/**
* Returns an iterator to the output of the process, with the output type as keys (Process::OUT/ERR).
*
* @param int $flags A bit field of Process::ITER_* flags
*
* @throws LogicException in case the output has been disabled
* @throws LogicException In case the process is not started
*
* @return \Generator
*/
public function getIterator($flags = 0)
{
$this->readPipesForOutput(__FUNCTION__, false);
$clearOutput = !(self::ITER_KEEP_OUTPUT & $flags);
$blocking = !(self::ITER_NON_BLOCKING & $flags);
$yieldOut = !(self::ITER_SKIP_OUT & $flags);
$yieldErr = !(self::ITER_SKIP_ERR & $flags);
while (null !== $this->callback || ($yieldOut && !feof($this->stdout)) || ($yieldErr && !feof($this->stderr))) {
if ($yieldOut) {
$out = stream_get_contents($this->stdout, -1, $this->incrementalOutputOffset);
if (isset($out[0])) {
if ($clearOutput) {
$this->clearOutput();
} else {
$this->incrementalOutputOffset = ftell($this->stdout);
}
yield self::OUT => $out;
}
}
if ($yieldErr) {
$err = stream_get_contents($this->stderr, -1, $this->incrementalErrorOutputOffset);
if (isset($err[0])) {
if ($clearOutput) {
$this->clearErrorOutput();
} else {
$this->incrementalErrorOutputOffset = ftell($this->stderr);
}
yield self::ERR => $err;
}
}
if (!$blocking && !isset($out[0]) && !isset($err[0])) {
yield self::OUT => '';
}
$this->checkTimeout();
$this->readPipesForOutput(__FUNCTION__, $blocking);
}
}
/**
* Clears the process output.
*
* @return $this
*/
public function clearOutput()
{
ftruncate($this->stdout, 0);
fseek($this->stdout, 0);
$this->incrementalOutputOffset = 0;
return $this;
}
/**
* Returns the current error output of the process (STDERR).
*
* @return string The process error output
*
* @throws LogicException in case the output has been disabled
* @throws LogicException In case the process is not started
*/
public function getErrorOutput()
{
$this->readPipesForOutput(__FUNCTION__);
if (false === $ret = stream_get_contents($this->stderr, -1, 0)) {
return '';
}
return $ret;
}
/**
* Returns the errorOutput incrementally.
*
* In comparison with the getErrorOutput method which always return the
* whole error output, this one returns the new error output since the last
* call.
*
* @return string The process error output since the last call
*
* @throws LogicException in case the output has been disabled
* @throws LogicException In case the process is not started
*/
public function getIncrementalErrorOutput()
{
$this->readPipesForOutput(__FUNCTION__);
$latest = stream_get_contents($this->stderr, -1, $this->incrementalErrorOutputOffset);
$this->incrementalErrorOutputOffset = ftell($this->stderr);
if (false === $latest) {
return '';
}
return $latest;
}
/**
* Clears the process output.
*
* @return $this
*/
public function clearErrorOutput()
{
ftruncate($this->stderr, 0);
fseek($this->stderr, 0);
$this->incrementalErrorOutputOffset = 0;
return $this;
}
/**
* Returns the exit code returned by the process.
*
* @return int|null The exit status code, null if the Process is not terminated
*/
public function getExitCode()
{
$this->updateStatus(false);
return $this->exitcode;
}
/**
* Returns a string representation for the exit code returned by the process.
*
* This method relies on the Unix exit code status standardization
* and might not be relevant for other operating systems.
*
* @return string|null A string representation for the exit status code, null if the Process is not terminated
*
* @see http://tldp.org/LDP/abs/html/exitcodes.html
* @see http://en.wikipedia.org/wiki/Unix_signal
*/
public function getExitCodeText()
{
if (null === $exitcode = $this->getExitCode()) {
return null;
}
return isset(self::$exitCodes[$exitcode]) ? self::$exitCodes[$exitcode] : 'Unknown error';
}
/**
* Checks if the process ended successfully.
*
* @return bool true if the process ended successfully, false otherwise
*/
public function isSuccessful()
{
return 0 === $this->getExitCode();
}
/**
* Returns true if the child process has been terminated by an uncaught signal.
*
* It always returns false on Windows.
*
* @return bool
*
* @throws LogicException In case the process is not terminated
*/
public function hasBeenSignaled()
{
$this->requireProcessIsTerminated(__FUNCTION__);
return $this->processInformation['signaled'];
}
/**
* Returns the number of the signal that caused the child process to terminate its execution.
*
* It is only meaningful if hasBeenSignaled() returns true.
*
* @return int
*
* @throws RuntimeException In case --enable-sigchild is activated
* @throws LogicException In case the process is not terminated
*/
public function getTermSignal()
{
$this->requireProcessIsTerminated(__FUNCTION__);
if ($this->isSigchildEnabled() && -1 === $this->processInformation['termsig']) {
throw new RuntimeException('This PHP has been compiled with --enable-sigchild. Term signal can not be retrieved.');
}
return $this->processInformation['termsig'];
}
/**
* Returns true if the child process has been stopped by a signal.
*
* It always returns false on Windows.
*
* @return bool
*
* @throws LogicException In case the process is not terminated
*/
public function hasBeenStopped()
{
$this->requireProcessIsTerminated(__FUNCTION__);
return $this->processInformation['stopped'];
}
/**
* Returns the number of the signal that caused the child process to stop its execution.
*
* It is only meaningful if hasBeenStopped() returns true.
*
* @return int
*
* @throws LogicException In case the process is not terminated
*/
public function getStopSignal()
{
$this->requireProcessIsTerminated(__FUNCTION__);
return $this->processInformation['stopsig'];
}
/**
* Checks if the process is currently running.
*
* @return bool true if the process is currently running, false otherwise
*/
public function isRunning()
{
if (self::STATUS_STARTED !== $this->status) {
return false;
}
$this->updateStatus(false);
return $this->processInformation['running'];
}
/**
* Checks if the process has been started with no regard to the current state.
*
* @return bool true if status is ready, false otherwise
*/
public function isStarted()
{
return self::STATUS_READY != $this->status;
}
/**
* Checks if the process is terminated.
*
* @return bool true if process is terminated, false otherwise
*/
public function isTerminated()
{
$this->updateStatus(false);
return self::STATUS_TERMINATED == $this->status;
}
/**
* Gets the process status.
*
* The status is one of: ready, started, terminated.
*
* @return string The current process status
*/
public function getStatus()
{
$this->updateStatus(false);
return $this->status;
}
/**
* Stops the process.
*
* @param int|float $timeout The timeout in seconds
* @param int $signal A POSIX signal to send in case the process has not stop at timeout, default is SIGKILL (9)
*
* @return int|null The exit-code of the process or null if it's not running
*/
public function stop($timeout = 10, $signal = null)
{
$timeoutMicro = microtime(true) + $timeout;
if ($this->isRunning()) {
// given SIGTERM may not be defined and that "proc_terminate" uses the constant value and not the constant itself, we use the same here
$this->doSignal(15, false);
do {
usleep(1000);
} while ($this->isRunning() && microtime(true) < $timeoutMicro);
if ($this->isRunning()) {
// Avoid exception here: process is supposed to be running, but it might have stopped just
// after this line. In any case, let's silently discard the error, we cannot do anything.
$this->doSignal($signal ?: 9, false);
}
}
if ($this->isRunning()) {
if (isset($this->fallbackStatus['pid'])) {
unset($this->fallbackStatus['pid']);
return $this->stop(0, $signal);
}
$this->close();
}
return $this->exitcode;
}
/**
* Adds a line to the STDOUT stream.
*
* @internal
*/
public function addOutput(string $line)
{
$this->lastOutputTime = microtime(true);
fseek($this->stdout, 0, SEEK_END);
fwrite($this->stdout, $line);
fseek($this->stdout, $this->incrementalOutputOffset);
}
/**
* Adds a line to the STDERR stream.
*
* @internal
*/
public function addErrorOutput(string $line)
{
$this->lastOutputTime = microtime(true);
fseek($this->stderr, 0, SEEK_END);
fwrite($this->stderr, $line);
fseek($this->stderr, $this->incrementalErrorOutputOffset);
}
/**
* Gets the last output time in seconds.
*
* @return float|null The last output time in seconds or null if it isn't started
*/
public function getLastOutputTime(): ?float
{
return $this->lastOutputTime;
}
/**
* Gets the command line to be executed.
*
* @return string The command to execute
*/
public function getCommandLine()
{
return \is_array($this->commandline) ? implode(' ', array_map([$this, 'escapeArgument'], $this->commandline)) : $this->commandline;
}
/**
* Sets the command line to be executed.
*
* @param string|array $commandline The command to execute
*
* @return $this
*
* @deprecated since Symfony 4.2.
*/
public function setCommandLine($commandline)
{
@trigger_error(sprintf('The "%s()" method is deprecated since Symfony 4.2.', __METHOD__), E_USER_DEPRECATED);
$this->commandline = $commandline;
return $this;
}
/**
* Gets the process timeout (max. runtime).
*
* @return float|null The timeout in seconds or null if it's disabled
*/
public function getTimeout()
{
return $this->timeout;
}
/**
* Gets the process idle timeout (max. time since last output).
*
* @return float|null The timeout in seconds or null if it's disabled
*/
public function getIdleTimeout()
{
return $this->idleTimeout;
}
/**
* Sets the process timeout (max. runtime) in seconds.
*
* To disable the timeout, set this value to null.
*
* @param int|float|null $timeout The timeout in seconds
*
* @return $this
*
* @throws InvalidArgumentException if the timeout is negative
*/
public function setTimeout($timeout)
{
$this->timeout = $this->validateTimeout($timeout);
return $this;
}
/**
* Sets the process idle timeout (max. time since last output).
*
* To disable the timeout, set this value to null.
*
* @param int|float|null $timeout The timeout in seconds
*
* @return $this
*
* @throws LogicException if the output is disabled
* @throws InvalidArgumentException if the timeout is negative
*/
public function setIdleTimeout($timeout)
{
if (null !== $timeout && $this->outputDisabled) {
throw new LogicException('Idle timeout can not be set while the output is disabled.');
}
$this->idleTimeout = $this->validateTimeout($timeout);
return $this;
}
/**
* Enables or disables the TTY mode.
*
* @param bool $tty True to enabled and false to disable
*
* @return $this
*
* @throws RuntimeException In case the TTY mode is not supported
*/
public function setTty($tty)
{
if ('\\' === \DIRECTORY_SEPARATOR && $tty) {
throw new RuntimeException('TTY mode is not supported on Windows platform.');
}
if ($tty && !self::isTtySupported()) {
throw new RuntimeException('TTY mode requires /dev/tty to be read/writable.');
}
$this->tty = (bool) $tty;
return $this;
}
/**
* Checks if the TTY mode is enabled.
*
* @return bool true if the TTY mode is enabled, false otherwise
*/
public function isTty()
{
return $this->tty;
}
/**
* Sets PTY mode.
*
* @param bool $bool
*
* @return $this
*/
public function setPty($bool)
{
$this->pty = (bool) $bool;
return $this;
}
/**
* Returns PTY state.
*
* @return bool
*/
public function isPty()
{
return $this->pty;
}
/**
* Gets the working directory.
*
* @return string|null The current working directory or null on failure
*/
public function getWorkingDirectory()
{
if (null === $this->cwd) {
// getcwd() will return false if any one of the parent directories does not have
// the readable or search mode set, even if the current directory does
return getcwd() ?: null;
}
return $this->cwd;
}
/**
* Sets the current working directory.
*
* @param string $cwd The new working directory
*
* @return $this
*/
public function setWorkingDirectory($cwd)
{
$this->cwd = $cwd;
return $this;
}
/**
* Gets the environment variables.
*
* @return array The current environment variables
*/
public function getEnv()
{
return $this->env;
}
/**
* Sets the environment variables.
*
* Each environment variable value should be a string.
* If it is an array, the variable is ignored.
* If it is false or null, it will be removed when
* env vars are otherwise inherited.
*
* That happens in PHP when 'argv' is registered into
* the $_ENV array for instance.
*
* @param array $env The new environment variables
*
* @return $this
*/
public function setEnv(array $env)
{
// Process can not handle env values that are arrays
$env = array_filter($env, function ($value) {
return !\is_array($value);
});
$this->env = $env;
return $this;
}
/**
* Gets the Process input.
*
* @return resource|string|\Iterator|null The Process input
*/
public function getInput()
{
return $this->input;
}
/**
* Sets the input.
*
* This content will be passed to the underlying process standard input.
*
* @param string|int|float|bool|resource|\Traversable|null $input The content
*
* @return $this
*
* @throws LogicException In case the process is running
*/
public function setInput($input)
{
if ($this->isRunning()) {
throw new LogicException('Input can not be set while the process is running.');
}
$this->input = ProcessUtils::validateInput(__METHOD__, $input);
return $this;
}
/**
* Sets whether environment variables will be inherited or not.
*
* @param bool $inheritEnv
*
* @return $this
*
* @deprecated since Symfony 4.4, env variables are always inherited
*/
public function inheritEnvironmentVariables($inheritEnv = true)
{
@trigger_error(sprintf('The "%s()" method is deprecated since Symfony 4.4, env variables are always inherited.', __METHOD__), E_USER_DEPRECATED);
if (!$inheritEnv) {
throw new InvalidArgumentException('Not inheriting environment variables is not supported.');
}
return $this;
}
/**
* Performs a check between the timeout definition and the time the process started.
*
* In case you run a background process (with the start method), you should
* trigger this method regularly to ensure the process timeout
*
* @throws ProcessTimedOutException In case the timeout was reached
*/
public function checkTimeout()
{
if (self::STATUS_STARTED !== $this->status) {
return;
}
if (null !== $this->timeout && $this->timeout < microtime(true) - $this->starttime) {
$this->stop(0);
throw new ProcessTimedOutException($this, ProcessTimedOutException::TYPE_GENERAL);
}
if (null !== $this->idleTimeout && $this->idleTimeout < microtime(true) - $this->lastOutputTime) {
$this->stop(0);
throw new ProcessTimedOutException($this, ProcessTimedOutException::TYPE_IDLE);
}
}
/**
* Returns whether TTY is supported on the current operating system.
*/
public static function isTtySupported(): bool
{
static $isTtySupported;
if (null === $isTtySupported) {
$isTtySupported = (bool) @proc_open('echo 1 >/dev/null', [['file', '/dev/tty', 'r'], ['file', '/dev/tty', 'w'], ['file', '/dev/tty', 'w']], $pipes);
}
return $isTtySupported;
}
/**
* Returns whether PTY is supported on the current operating system.
*
* @return bool
*/
public static function isPtySupported()
{
static $result;
if (null !== $result) {
return $result;
}
if ('\\' === \DIRECTORY_SEPARATOR) {
return $result = false;
}
return $result = (bool) @proc_open('echo 1 >/dev/null', [['pty'], ['pty'], ['pty']], $pipes);
}
/**
* Creates the descriptors needed by the proc_open.
*/
private function getDescriptors(): array
{
if ($this->input instanceof \Iterator) {
$this->input->rewind();
}
if ('\\' === \DIRECTORY_SEPARATOR) {
$this->processPipes = new WindowsPipes($this->input, !$this->outputDisabled || $this->hasCallback);
} else {
$this->processPipes = new UnixPipes($this->isTty(), $this->isPty(), $this->input, !$this->outputDisabled || $this->hasCallback);
}
return $this->processPipes->getDescriptors();
}
/**
* Builds up the callback used by wait().
*
* The callbacks adds all occurred output to the specific buffer and calls
* the user callback (if present) with the received output.
*
* @param callable|null $callback The user defined PHP callback
*
* @return \Closure A PHP closure
*/
protected function buildCallback(callable $callback = null)
{
if ($this->outputDisabled) {
return function ($type, $data) use ($callback): bool {
return null !== $callback && $callback($type, $data);
};
}
$out = self::OUT;
return function ($type, $data) use ($callback, $out): bool {
if ($out == $type) {
$this->addOutput($data);
} else {
$this->addErrorOutput($data);
}
return null !== $callback && $callback($type, $data);
};
}
/**
* Updates the status of the process, reads pipes.
*
* @param bool $blocking Whether to use a blocking read call
*/
protected function updateStatus($blocking)
{
if (self::STATUS_STARTED !== $this->status) {
return;
}
$this->processInformation = proc_get_status($this->process);
$running = $this->processInformation['running'];
$this->readPipes($running && $blocking, '\\' !== \DIRECTORY_SEPARATOR || !$running);
if ($this->fallbackStatus && $this->isSigchildEnabled()) {
$this->processInformation = $this->fallbackStatus + $this->processInformation;
}
if (!$running) {
$this->close();
}
}
/**
* Returns whether PHP has been compiled with the '--enable-sigchild' option or not.
*
* @return bool
*/
protected function isSigchildEnabled()
{
if (null !== self::$sigchild) {
return self::$sigchild;
}
if (!\function_exists('phpinfo')) {
return self::$sigchild = false;
}
ob_start();
phpinfo(INFO_GENERAL);
return self::$sigchild = false !== strpos(ob_get_clean(), '--enable-sigchild');
}
/**
* Reads pipes for the freshest output.
*
* @param string $caller The name of the method that needs fresh outputs
* @param bool $blocking Whether to use blocking calls or not
*
* @throws LogicException in case output has been disabled or process is not started
*/
private function readPipesForOutput(string $caller, bool $blocking = false)
{
if ($this->outputDisabled) {
throw new LogicException('Output has been disabled.');
}
$this->requireProcessIsStarted($caller);
$this->updateStatus($blocking);
}
/**
* Validates and returns the filtered timeout.
*
* @throws InvalidArgumentException if the given timeout is a negative number
*/
private function validateTimeout(?float $timeout): ?float
{
$timeout = (float) $timeout;
if (0.0 === $timeout) {
$timeout = null;
} elseif ($timeout < 0) {
throw new InvalidArgumentException('The timeout value must be a valid positive integer or float number.');
}
return $timeout;
}
/**
* Reads pipes, executes callback.
*
* @param bool $blocking Whether to use blocking calls or not
* @param bool $close Whether to close file handles or not
*/
private function readPipes(bool $blocking, bool $close)
{
$result = $this->processPipes->readAndWrite($blocking, $close);
$callback = $this->callback;
foreach ($result as $type => $data) {
if (3 !== $type) {
$callback(self::STDOUT === $type ? self::OUT : self::ERR, $data);
} elseif (!isset($this->fallbackStatus['signaled'])) {
$this->fallbackStatus['exitcode'] = (int) $data;
}
}
}
/**
* Closes process resource, closes file handles, sets the exitcode.
*
* @return int The exitcode
*/
private function close(): int
{
$this->processPipes->close();
if (\is_resource($this->process)) {
proc_close($this->process);
}
$this->exitcode = $this->processInformation['exitcode'];
$this->status = self::STATUS_TERMINATED;
if (-1 === $this->exitcode) {
if ($this->processInformation['signaled'] && 0 < $this->processInformation['termsig']) {
// if process has been signaled, no exitcode but a valid termsig, apply Unix convention
$this->exitcode = 128 + $this->processInformation['termsig'];
} elseif ($this->isSigchildEnabled()) {
$this->processInformation['signaled'] = true;
$this->processInformation['termsig'] = -1;
}
}
// Free memory from self-reference callback created by buildCallback
// Doing so in other contexts like __destruct or by garbage collector is ineffective
// Now pipes are closed, so the callback is no longer necessary
$this->callback = null;
return $this->exitcode;
}
/**
* Resets data related to the latest run of the process.
*/
private function resetProcessData()
{
$this->starttime = null;
$this->callback = null;
$this->exitcode = null;
$this->fallbackStatus = [];
$this->processInformation = null;
$this->stdout = fopen('php://temp/maxmemory:'.(1024 * 1024), 'w+b');
$this->stderr = fopen('php://temp/maxmemory:'.(1024 * 1024), 'w+b');
$this->process = null;
$this->latestSignal = null;
$this->status = self::STATUS_READY;
$this->incrementalOutputOffset = 0;
$this->incrementalErrorOutputOffset = 0;
}
/**
* Sends a POSIX signal to the process.
*
* @param int $signal A valid POSIX signal (see https://php.net/pcntl.constants)
* @param bool $throwException Whether to throw exception in case signal failed
*
* @return bool True if the signal was sent successfully, false otherwise
*
* @throws LogicException In case the process is not running
* @throws RuntimeException In case --enable-sigchild is activated and the process can't be killed
* @throws RuntimeException In case of failure
*/
private function doSignal(int $signal, bool $throwException): bool
{
if (null === $pid = $this->getPid()) {
if ($throwException) {
throw new LogicException('Can not send signal on a non running process.');
}
return false;
}
if ('\\' === \DIRECTORY_SEPARATOR) {
exec(sprintf('taskkill /F /T /PID %d 2>&1', $pid), $output, $exitCode);
if ($exitCode && $this->isRunning()) {
if ($throwException) {
throw new RuntimeException(sprintf('Unable to kill the process (%s).', implode(' ', $output)));
}
return false;
}
} else {
if (!$this->isSigchildEnabled()) {
$ok = @proc_terminate($this->process, $signal);
} elseif (\function_exists('posix_kill')) {
$ok = @posix_kill($pid, $signal);
} elseif ($ok = proc_open(sprintf('kill -%d %d', $signal, $pid), [2 => ['pipe', 'w']], $pipes)) {
$ok = false === fgets($pipes[2]);
}
if (!$ok) {
if ($throwException) {
throw new RuntimeException(sprintf('Error while sending signal "%s".', $signal));
}
return false;
}
}
$this->latestSignal = $signal;
$this->fallbackStatus['signaled'] = true;
$this->fallbackStatus['exitcode'] = -1;
$this->fallbackStatus['termsig'] = $this->latestSignal;
return true;
}
private function prepareWindowsCommandLine(string $cmd, array &$env): string
{
$uid = uniqid('', true);
$varCount = 0;
$varCache = [];
$cmd = preg_replace_callback(
'/"(?:(
[^"%!^]*+
(?:
(?: !LF! | "(?:\^[%!^])?+" )
[^"%!^]*+
)++
) | [^"]*+ )"/x',
function ($m) use (&$env, &$varCache, &$varCount, $uid) {
if (!isset($m[1])) {
return $m[0];
}
if (isset($varCache[$m[0]])) {
return $varCache[$m[0]];
}
if (false !== strpos($value = $m[1], "\0")) {
$value = str_replace("\0", '?', $value);
}
if (false === strpbrk($value, "\"%!\n")) {
return '"'.$value.'"';
}
$value = str_replace(['!LF!', '"^!"', '"^%"', '"^^"', '""'], ["\n", '!', '%', '^', '"'], $value);
$value = '"'.preg_replace('/(\\\\*)"/', '$1$1\\"', $value).'"';
$var = $uid.++$varCount;
$env[$var] = $value;
return $varCache[$m[0]] = '!'.$var.'!';
},
$cmd
);
$cmd = 'cmd /V:ON /E:ON /D /C ('.str_replace("\n", ' ', $cmd).')';
foreach ($this->processPipes->getFiles() as $offset => $filename) {
$cmd .= ' '.$offset.'>"'.$filename.'"';
}
return $cmd;
}
/**
* Ensures the process is running or terminated, throws a LogicException if the process has a not started.
*
* @throws LogicException if the process has not run
*/
private function requireProcessIsStarted(string $functionName)
{
if (!$this->isStarted()) {
throw new LogicException(sprintf('Process must be started before calling %s.', $functionName));
}
}
/**
* Ensures the process is terminated, throws a LogicException if the process has a status different than "terminated".
*
* @throws LogicException if the process is not yet terminated
*/
private function requireProcessIsTerminated(string $functionName)
{
if (!$this->isTerminated()) {
throw new LogicException(sprintf('Process must be terminated before calling %s.', $functionName));
}
}
/**
* Escapes a string to be used as a shell argument.
*/
private function escapeArgument(?string $argument): string
{
if ('' === $argument || null === $argument) {
return '""';
}
if ('\\' !== \DIRECTORY_SEPARATOR) {
return "'".str_replace("'", "'\\''", $argument)."'";
}
if (false !== strpos($argument, "\0")) {
$argument = str_replace("\0", '?', $argument);
}
if (!preg_match('/[\/()%!^"<>&|\s]/', $argument)) {
return $argument;
}
$argument = preg_replace('/(\\\\+)$/', '$1$1', $argument);
return '"'.str_replace(['"', '^', '%', '!', "\n"], ['""', '"^^"', '"^%"', '"^!"', '!LF!'], $argument).'"';
}
private function replacePlaceholders(string $commandline, array $env)
{
return preg_replace_callback('/"\$([_a-zA-Z]++[_a-zA-Z0-9]*+)"/', function ($matches) use ($commandline, $env) {
if (!isset($env[$matches[1]]) || false === $env[$matches[1]]) {
throw new InvalidArgumentException(sprintf('Command line is missing a value for key %s: %s.', $matches[0], $commandline));
}
return '\\' === \DIRECTORY_SEPARATOR ? $this->escapeArgument($env[$matches[1]]) : $matches[0];
}, $commandline);
}
private function getDefaultEnv(): array
{
$env = [];
foreach ($_SERVER as $k => $v) {
if (\is_string($v) && false !== $v = getenv($k)) {
$env[$k] = $v;
}
}
foreach ($_ENV as $k => $v) {
if (\is_string($v)) {
$env[$k] = $v;
}
}
return $env;
}
}