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<?php
namespace gipfl\Cli;
class Process
{
/** @var string|null */
protected static $initialCwd;
/**
* Set the command/process title for this process
*
* @param $title
*/
public static function setTitle($title)
{
if (function_exists('cli_set_process_title')) {
\cli_set_process_title($title);
}
}
/**
* Replace this process with a new instance of itself by executing the
* very same binary with the very same parameters
*/
public static function restart()
{
// _ is only available when executed via shell
$binary = static::getEnv('_');
$argv = $_SERVER['argv'];
if (\strlen($binary) === 0) {
// Problem: this doesn't work if we changed working directory and
// called the binary with a relative path. Something that doesn't
// happen when started as a daemon, and when started manually we
// should have $_ from our shell.
$binary = static::absoluteFilename(\array_shift($argv));
} else {
\array_shift($argv);
}
\pcntl_exec($binary, $argv, static::getEnv());
}
/**
* Get the given ENV variable, null if not available
*
* Returns an array with all ENV variables if no $key is given
*
* @param string|null $key
* @return array|string|null
*/
public static function getEnv($key = null)
{
if ($key !== null) {
return \getenv($key);
}
if (PHP_VERSION_ID > 70100) {
return \getenv();
} else {
$env = $_SERVER;
unset($env['argv'], $env['argc']);
return $env;
}
}
/**
* Get the path to the executed binary when starting this command
*
* This fails if we changed working directory and called the binary with a
* relative path. Something that doesn't happen when started as a daemon.
* When started manually we should have $_ from our shell.
*
* To be always on the safe side please call Process::getInitialCwd() once
* after starting your process and before switching directory. That way we
* preserve our initial working directory.
*
* @return mixed|string
*/
public static function getBinaryPath()
{
if (isset($_SERVER['_'])) {
return $_SERVER['_'];
} else {
global $argv;
return static::absoluteFilename($argv[0]);
}
}
/**
* The working directory as given by getcwd() the very first time we
* called this method
*
* @return string
*/
public static function getInitialCwd()
{
if (self::$initialCwd === null) {
self::$initialCwd = \getcwd();
}
return self::$initialCwd;
}
/**
* Returns the absolute filename for the given file
*
* If relative, it's calculated in relation to the given working directory.
* The current working directory is being used if null is given.
*
* @param $filename
* @param null $cwd
* @return string
*/
public static function absoluteFilename($filename, $cwd = null)
{
$filename = \str_replace(
DIRECTORY_SEPARATOR . DIRECTORY_SEPARATOR,
DIRECTORY_SEPARATOR,
$filename
);
if ($filename[0] === '.') {
$filename = ($cwd ?: \getcwd()) . DIRECTORY_SEPARATOR . $filename;
}
$parts = \explode(DIRECTORY_SEPARATOR, $filename);
$result = [];
foreach ($parts as $part) {
if ($part === '.') {
continue;
}
if ($part === '..') {
\array_pop($result);
continue;
}
$result[] = $part;
}
return \implode(DIRECTORY_SEPARATOR, $result);
}
}
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