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<?php
/**
* Copyright (C) 2017 Kunal Mehta <legoktm@debian.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
use MediaWiki\Shell\Shell;
use Wikimedia\AtEase\AtEase;
/**
* Utility class to find executables in likely places
*
* @since 1.31
*/
class ExecutableFinder {
/**
* Get an array of likely places we can find executables. Check a bunch
* of known Unix-like defaults, as well as the PATH environment variable
* (which should maybe make it work for Windows?)
*
* @return array
*/
protected static function getPossibleBinPaths() {
return array_unique( array_merge(
[ '/usr/bin', '/bin', '/usr/local/bin', '/opt/csw/bin',
'/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ],
explode( PATH_SEPARATOR, getenv( 'PATH' ) )
) );
}
/**
* Search a path for any of the given executable names. Returns the
* executable name if found. Also checks the version string returned
* by each executable.
*
* Used only by environment checks.
*
* @param string $path Path to search
* @param string $name Executable name to look for
* @param array|bool $versionInfo False or array with two members:
* 0 => Parameter to pass to binary for version check (e.g. --version)
* 1 => String to compare the output with
*
* If $versionInfo is not false, only executables with a version
* matching $versionInfo[1] will be returned.
* @return bool|string
*/
protected static function findExecutable( $path, $name, $versionInfo = false ) {
$command = $path . DIRECTORY_SEPARATOR . $name;
AtEase::suppressWarnings();
$file_exists = is_executable( $command );
AtEase::restoreWarnings();
if ( $file_exists ) {
if ( !$versionInfo ) {
return $command;
}
$output = Shell::command( $command, $versionInfo[0] )
->includeStderr()->execute()->getStdout();
if ( strstr( $output, $versionInfo[1] ) !== false ) {
return $command;
}
}
return false;
}
/**
* Same as locateExecutable(), but checks in getPossibleBinPaths() by default
* @see locateExecutable()
* @param string|string[] $names Array of possible names.
* @param array|bool $versionInfo Default: false or array with two members:
* 0 => Parameter to run for version check, e.g. '--version'
* 1 => String to compare the output with
*
* If $versionInfo is not false, only executables with a version
* matching $versionInfo[1] will be returned.
* @return bool|string
*/
public static function findInDefaultPaths( $names, $versionInfo = false ) {
if ( Shell::isDisabled() ) {
// If we can't shell out, there's no point looking for executables
return false;
}
$paths = self::getPossibleBinPaths();
foreach ( (array)$names as $name ) {
foreach ( $paths as $path ) {
$exe = self::findExecutable( $path, $name, $versionInfo );
if ( $exe !== false ) {
return $exe;
}
}
}
return false;
}
}
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