scratch – Rev 126
?pathlinks?
<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Filesystem;
use Symfony\Component\Filesystem\Exception\IOException;
use Symfony\Component\Filesystem\Exception\FileNotFoundException;
/**
* Provides basic utility to manipulate the file system.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class Filesystem
{
/**
* Copies a file.
*
* If the target file is older than the origin file, it's always overwritten.
* If the target file is newer, it is overwritten only when the
* $overwriteNewerFiles option is set to true.
*
* @param string $originFile The original filename
* @param string $targetFile The target filename
* @param bool $overwriteNewerFiles If true, target files newer than origin files are overwritten
*
* @throws FileNotFoundException When originFile doesn't exist
* @throws IOException When copy fails
*/
public function copy($originFile, $targetFile, $overwriteNewerFiles = false)
{
if (stream_is_local($originFile) && !is_file($originFile)) {
throw new FileNotFoundException(sprintf('Failed to copy "%s" because file does not exist.', $originFile), 0, null, $originFile);
}
$this->mkdir(dirname($targetFile));
$doCopy = true;
if (!$overwriteNewerFiles && null === parse_url($originFile, PHP_URL_HOST) && is_file($targetFile)) {
$doCopy = filemtime($originFile) > filemtime($targetFile);
}
if ($doCopy) {
// https://bugs.php.net/bug.php?id=64634
if (false === $source = @fopen($originFile, 'r')) {
throw new IOException(sprintf('Failed to copy "%s" to "%s" because source file could not be opened for reading.', $originFile, $targetFile), 0, null, $originFile);
}
// Stream context created to allow files overwrite when using FTP stream wrapper - disabled by default
if (false === $target = @fopen($targetFile, 'w', null, stream_context_create(array('ftp' => array('overwrite' => true))))) {
throw new IOException(sprintf('Failed to copy "%s" to "%s" because target file could not be opened for writing.', $originFile, $targetFile), 0, null, $originFile);
}
$bytesCopied = stream_copy_to_stream($source, $target);
fclose($source);
fclose($target);
unset($source, $target);
if (!is_file($targetFile)) {
throw new IOException(sprintf('Failed to copy "%s" to "%s".', $originFile, $targetFile), 0, null, $originFile);
}
// Like `cp`, preserve executable permission bits
@chmod($targetFile, fileperms($targetFile) | (fileperms($originFile) & 0111));
if (stream_is_local($originFile) && $bytesCopied !== ($bytesOrigin = filesize($originFile))) {
throw new IOException(sprintf('Failed to copy the whole content of "%s" to "%s" (%g of %g bytes copied).', $originFile, $targetFile, $bytesCopied, $bytesOrigin), 0, null, $originFile);
}
}
}
/**
* Creates a directory recursively.
*
* @param string|array|\Traversable $dirs The directory path
* @param int $mode The directory mode
*
* @throws IOException On any directory creation failure
*/
public function mkdir($dirs, $mode = 0777)
{
foreach ($this->toIterator($dirs) as $dir) {
if (is_dir($dir)) {
continue;
}
if (true !== @mkdir($dir, $mode, true)) {
$error = error_get_last();
if (!is_dir($dir)) {
// The directory was not created by a concurrent process. Let's throw an exception with a developer friendly error message if we have one
if ($error) {
throw new IOException(sprintf('Failed to create "%s": %s.', $dir, $error['message']), 0, null, $dir);
}
throw new IOException(sprintf('Failed to create "%s"', $dir), 0, null, $dir);
}
}
}
}
/**
* Checks the existence of files or directories.
*
* @param string|array|\Traversable $files A filename, an array of files, or a \Traversable instance to check
*
* @return bool true if the file exists, false otherwise
*/
public function exists($files)
{
foreach ($this->toIterator($files) as $file) {
if ('\\' === DIRECTORY_SEPARATOR && strlen($file) > 258) {
throw new IOException('Could not check if file exist because path length exceeds 258 characters.', 0, null, $file);
}
if (!file_exists($file)) {
return false;
}
}
return true;
}
/**
* Sets access and modification time of file.
*
* @param string|array|\Traversable $files A filename, an array of files, or a \Traversable instance to create
* @param int $time The touch time as a Unix timestamp
* @param int $atime The access time as a Unix timestamp
*
* @throws IOException When touch fails
*/
public function touch($files, $time = null, $atime = null)
{
foreach ($this->toIterator($files) as $file) {
$touch = $time ? @touch($file, $time, $atime) : @touch($file);
if (true !== $touch) {
throw new IOException(sprintf('Failed to touch "%s".', $file), 0, null, $file);
}
}
}
/**
* Removes files or directories.
*
* @param string|array|\Traversable $files A filename, an array of files, or a \Traversable instance to remove
*
* @throws IOException When removal fails
*/
public function remove($files)
{
if ($files instanceof \Traversable) {
$files = iterator_to_array($files, false);
} elseif (!is_array($files)) {
$files = array($files);
}
$files = array_reverse($files);
foreach ($files as $file) {
if (is_link($file)) {
// See https://bugs.php.net/52176
if (!@(unlink($file) || '\\' !== DIRECTORY_SEPARATOR || rmdir($file)) && file_exists($file)) {
$error = error_get_last();
throw new IOException(sprintf('Failed to remove symlink "%s": %s.', $file, $error['message']));
}
} elseif (is_dir($file)) {
$this->remove(new \FilesystemIterator($file, \FilesystemIterator::CURRENT_AS_PATHNAME | \FilesystemIterator::SKIP_DOTS));
if (!@rmdir($file) && file_exists($file)) {
$error = error_get_last();
throw new IOException(sprintf('Failed to remove directory "%s": %s.', $file, $error['message']));
}
} elseif (!@unlink($file) && file_exists($file)) {
$error = error_get_last();
throw new IOException(sprintf('Failed to remove file "%s": %s.', $file, $error['message']));
}
}
}
/**
* Change mode for an array of files or directories.
*
* @param string|array|\Traversable $files A filename, an array of files, or a \Traversable instance to change mode
* @param int $mode The new mode (octal)
* @param int $umask The mode mask (octal)
* @param bool $recursive Whether change the mod recursively or not
*
* @throws IOException When the change fail
*/
public function chmod($files, $mode, $umask = 0000, $recursive = false)
{
foreach ($this->toIterator($files) as $file) {
if (true !== @chmod($file, $mode & ~$umask)) {
throw new IOException(sprintf('Failed to chmod file "%s".', $file), 0, null, $file);
}
if ($recursive && is_dir($file) && !is_link($file)) {
$this->chmod(new \FilesystemIterator($file), $mode, $umask, true);
}
}
}
/**
* Change the owner of an array of files or directories.
*
* @param string|array|\Traversable $files A filename, an array of files, or a \Traversable instance to change owner
* @param string $user The new owner user name
* @param bool $recursive Whether change the owner recursively or not
*
* @throws IOException When the change fail
*/
public function chown($files, $user, $recursive = false)
{
foreach ($this->toIterator($files) as $file) {
if ($recursive && is_dir($file) && !is_link($file)) {
$this->chown(new \FilesystemIterator($file), $user, true);
}
if (is_link($file) && function_exists('lchown')) {
if (true !== @lchown($file, $user)) {
throw new IOException(sprintf('Failed to chown file "%s".', $file), 0, null, $file);
}
} else {
if (true !== @chown($file, $user)) {
throw new IOException(sprintf('Failed to chown file "%s".', $file), 0, null, $file);
}
}
}
}
/**
* Change the group of an array of files or directories.
*
* @param string|array|\Traversable $files A filename, an array of files, or a \Traversable instance to change group
* @param string $group The group name
* @param bool $recursive Whether change the group recursively or not
*
* @throws IOException When the change fail
*/
public function chgrp($files, $group, $recursive = false)
{
foreach ($this->toIterator($files) as $file) {
if ($recursive && is_dir($file) && !is_link($file)) {
$this->chgrp(new \FilesystemIterator($file), $group, true);
}
if (is_link($file) && function_exists('lchgrp')) {
if (true !== @lchgrp($file, $group) || (defined('HHVM_VERSION') && !posix_getgrnam($group))) {
throw new IOException(sprintf('Failed to chgrp file "%s".', $file), 0, null, $file);
}
} else {
if (true !== @chgrp($file, $group)) {
throw new IOException(sprintf('Failed to chgrp file "%s".', $file), 0, null, $file);
}
}
}
}
/**
* Renames a file or a directory.
*
* @param string $origin The origin filename or directory
* @param string $target The new filename or directory
* @param bool $overwrite Whether to overwrite the target if it already exists
*
* @throws IOException When target file or directory already exists
* @throws IOException When origin cannot be renamed
*/
public function rename($origin, $target, $overwrite = false)
{
// we check that target does not exist
if (!$overwrite && $this->isReadable($target)) {
throw new IOException(sprintf('Cannot rename because the target "%s" already exists.', $target), 0, null, $target);
}
if (true !== @rename($origin, $target)) {
if (is_dir($origin)) {
// See https://bugs.php.net/bug.php?id=54097 & http://php.net/manual/en/function.rename.php#113943
$this->mirror($origin, $target, null, array('override' => $overwrite, 'delete' => $overwrite));
$this->remove($origin);
return;
}
throw new IOException(sprintf('Cannot rename "%s" to "%s".', $origin, $target), 0, null, $target);
}
}
/**
* Tells whether a file exists and is readable.
*
* @param string $filename Path to the file
*
* @return bool
*
* @throws IOException When windows path is longer than 258 characters
*/
private function isReadable($filename)
{
if ('\\' === DIRECTORY_SEPARATOR && strlen($filename) > 258) {
throw new IOException('Could not check if file is readable because path length exceeds 258 characters.', 0, null, $filename);
}
return is_readable($filename);
}
/**
* Creates a symbolic link or copy a directory.
*
* @param string $originDir The origin directory path
* @param string $targetDir The symbolic link name
* @param bool $copyOnWindows Whether to copy files if on Windows
*
* @throws IOException When symlink fails
*/
public function symlink($originDir, $targetDir, $copyOnWindows = false)
{
if ('\\' === DIRECTORY_SEPARATOR) {
$originDir = strtr($originDir, '/', '\\');
$targetDir = strtr($targetDir, '/', '\\');
if ($copyOnWindows) {
$this->mirror($originDir, $targetDir);
return;
}
}
$this->mkdir(dirname($targetDir));
$ok = false;
if (is_link($targetDir)) {
if (readlink($targetDir) != $originDir) {
$this->remove($targetDir);
} else {
$ok = true;
}
}
if (!$ok && true !== @symlink($originDir, $targetDir)) {
$this->linkException($originDir, $targetDir, 'symbolic');
}
}
/**
* Creates a hard link, or several hard links to a file.
*
* @param string $originFile The original file
* @param string|string[] $targetFiles The target file(s)
*
* @throws FileNotFoundException When original file is missing or not a file
* @throws IOException When link fails, including if link already exists
*/
public function hardlink($originFile, $targetFiles)
{
if (!$this->exists($originFile)) {
throw new FileNotFoundException(null, 0, null, $originFile);
}
if (!is_file($originFile)) {
throw new FileNotFoundException(sprintf('Origin file "%s" is not a file', $originFile));
}
foreach ($this->toIterator($targetFiles) as $targetFile) {
if (is_file($targetFile)) {
if (fileinode($originFile) === fileinode($targetFile)) {
continue;
}
$this->remove($targetFile);
}
if (true !== @link($originFile, $targetFile)) {
$this->linkException($originFile, $targetFile, 'hard');
}
}
}
/**
* @param string $origin
* @param string $target
* @param string $linkType Name of the link type, typically 'symbolic' or 'hard'
*/
private function linkException($origin, $target, $linkType)
{
$report = error_get_last();
if (is_array($report)) {
if ('\\' === DIRECTORY_SEPARATOR && false !== strpos($report['message'], 'error code(1314)')) {
throw new IOException(sprintf('Unable to create %s link due to error code 1314: \'A required privilege is not held by the client\'. Do you have the required Administrator-rights?', $linkType), 0, null, $target);
}
}
throw new IOException(sprintf('Failed to create %s link from "%s" to "%s".', $linkType, $origin, $target), 0, null, $target);
}
/**
* Resolves links in paths.
*
* With $canonicalize = false (default)
* - if $path does not exist or is not a link, returns null
* - if $path is a link, returns the next direct target of the link without considering the existence of the target
*
* With $canonicalize = true
* - if $path does not exist, returns null
* - if $path exists, returns its absolute fully resolved final version
*
* @param string $path A filesystem path
* @param bool $canonicalize Whether or not to return a canonicalized path
*
* @return string|null
*/
public function readlink($path, $canonicalize = false)
{
if (!$canonicalize && !is_link($path)) {
return;
}
if ($canonicalize) {
if (!$this->exists($path)) {
return;
}
if ('\\' === DIRECTORY_SEPARATOR) {
$path = readlink($path);
}
return realpath($path);
}
if ('\\' === DIRECTORY_SEPARATOR) {
return realpath($path);
}
return readlink($path);
}
/**
* Given an existing path, convert it to a path relative to a given starting path.
*
* @param string $endPath Absolute path of target
* @param string $startPath Absolute path where traversal begins
*
* @return string Path of target relative to starting path
*/
public function makePathRelative($endPath, $startPath)
{
// Normalize separators on Windows
if ('\\' === DIRECTORY_SEPARATOR) {
$endPath = str_replace('\\', '/', $endPath);
$startPath = str_replace('\\', '/', $startPath);
}
// Split the paths into arrays
$startPathArr = explode('/', trim($startPath, '/'));
$endPathArr = explode('/', trim($endPath, '/'));
if ('/' !== $startPath[0]) {
array_shift($startPathArr);
}
if ('/' !== $endPath[0]) {
array_shift($endPathArr);
}
$normalizePathArray = function ($pathSegments) {
$result = array();
foreach ($pathSegments as $segment) {
if ('..' === $segment) {
array_pop($result);
} else {
$result[] = $segment;
}
}
return $result;
};
$startPathArr = $normalizePathArray($startPathArr);
$endPathArr = $normalizePathArray($endPathArr);
// Find for which directory the common path stops
$index = 0;
while (isset($startPathArr[$index]) && isset($endPathArr[$index]) && $startPathArr[$index] === $endPathArr[$index]) {
++$index;
}
// Determine how deep the start path is relative to the common path (ie, "web/bundles" = 2 levels)
if (count($startPathArr) === 1 && $startPathArr[0] === '') {
$depth = 0;
} else {
$depth = count($startPathArr) - $index;
}
// When we need to traverse from the start, and we are starting from a root path, don't add '../'
if ('/' === $startPath[0] && 0 === $index && 0 === $depth) {
$traverser = '';
} else {
// Repeated "../" for each level need to reach the common path
$traverser = str_repeat('../', $depth);
}
$endPathRemainder = implode('/', array_slice($endPathArr, $index));
// Construct $endPath from traversing to the common path, then to the remaining $endPath
$relativePath = $traverser.('' !== $endPathRemainder ? $endPathRemainder.'/' : '');
return '' === $relativePath ? './' : $relativePath;
}
/**
* Mirrors a directory to another.
*
* @param string $originDir The origin directory
* @param string $targetDir The target directory
* @param \Traversable $iterator A Traversable instance
* @param array $options An array of boolean options
* Valid options are:
* - $options['override'] Whether to override an existing file on copy or not (see copy())
* - $options['copy_on_windows'] Whether to copy files instead of links on Windows (see symlink())
* - $options['delete'] Whether to delete files that are not in the source directory (defaults to false)
*
* @throws IOException When file type is unknown
*/
public function mirror($originDir, $targetDir, \Traversable $iterator = null, $options = array())
{
$targetDir = rtrim($targetDir, '/\\');
$originDir = rtrim($originDir, '/\\');
// Iterate in destination folder to remove obsolete entries
if ($this->exists($targetDir) && isset($options['delete']) && $options['delete']) {
$deleteIterator = $iterator;
if (null === $deleteIterator) {
$flags = \FilesystemIterator::SKIP_DOTS;
$deleteIterator = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($targetDir, $flags), \RecursiveIteratorIterator::CHILD_FIRST);
}
foreach ($deleteIterator as $file) {
$origin = str_replace($targetDir, $originDir, $file->getPathname());
if (!$this->exists($origin)) {
$this->remove($file);
}
}
}
$copyOnWindows = false;
if (isset($options['copy_on_windows'])) {
$copyOnWindows = $options['copy_on_windows'];
}
if (null === $iterator) {
$flags = $copyOnWindows ? \FilesystemIterator::SKIP_DOTS | \FilesystemIterator::FOLLOW_SYMLINKS : \FilesystemIterator::SKIP_DOTS;
$iterator = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($originDir, $flags), \RecursiveIteratorIterator::SELF_FIRST);
}
if ($this->exists($originDir)) {
$this->mkdir($targetDir);
}
foreach ($iterator as $file) {
$target = str_replace($originDir, $targetDir, $file->getPathname());
if ($copyOnWindows) {
if (is_file($file)) {
$this->copy($file, $target, isset($options['override']) ? $options['override'] : false);
} elseif (is_dir($file)) {
$this->mkdir($target);
} else {
throw new IOException(sprintf('Unable to guess "%s" file type.', $file), 0, null, $file);
}
} else {
if (is_link($file)) {
$this->symlink($file->getLinkTarget(), $target);
} elseif (is_dir($file)) {
$this->mkdir($target);
} elseif (is_file($file)) {
$this->copy($file, $target, isset($options['override']) ? $options['override'] : false);
} else {
throw new IOException(sprintf('Unable to guess "%s" file type.', $file), 0, null, $file);
}
}
}
}
/**
* Returns whether the file path is an absolute path.
*
* @param string $file A file path
*
* @return bool
*/
public function isAbsolutePath($file)
{
return strspn($file, '/\\', 0, 1)
|| (strlen($file) > 3 && ctype_alpha($file[0])
&& substr($file, 1, 1) === ':'
&& strspn($file, '/\\', 2, 1)
)
|| null !== parse_url($file, PHP_URL_SCHEME)
;
}
/**
* Creates a temporary file with support for custom stream wrappers.
*
* @param string $dir The directory where the temporary filename will be created
* @param string $prefix The prefix of the generated temporary filename
* Note: Windows uses only the first three characters of prefix
*
* @return string The new temporary filename (with path), or throw an exception on failure
*/
public function tempnam($dir, $prefix)
{
list($scheme, $hierarchy) = $this->getSchemeAndHierarchy($dir);
// If no scheme or scheme is "file" or "gs" (Google Cloud) create temp file in local filesystem
if (null === $scheme || 'file' === $scheme || 'gs' === $scheme) {
$tmpFile = @tempnam($hierarchy, $prefix);
// If tempnam failed or no scheme return the filename otherwise prepend the scheme
if (false !== $tmpFile) {
if (null !== $scheme && 'gs' !== $scheme) {
return $scheme.'://'.$tmpFile;
}
return $tmpFile;
}
throw new IOException('A temporary file could not be created.');
}
// Loop until we create a valid temp file or have reached 10 attempts
for ($i = 0; $i < 10; ++$i) {
// Create a unique filename
$tmpFile = $dir.'/'.$prefix.uniqid(mt_rand(), true);
// Use fopen instead of file_exists as some streams do not support stat
// Use mode 'x+' to atomically check existence and create to avoid a TOCTOU vulnerability
$handle = @fopen($tmpFile, 'x+');
// If unsuccessful restart the loop
if (false === $handle) {
continue;
}
// Close the file if it was successfully opened
@fclose($handle);
return $tmpFile;
}
throw new IOException('A temporary file could not be created.');
}
/**
* Atomically dumps content into a file.
*
* @param string $filename The file to be written to
* @param string $content The data to write into the file
*
* @throws IOException If the file cannot be written to
*/
public function dumpFile($filename, $content)
{
$dir = dirname($filename);
if (!is_dir($dir)) {
$this->mkdir($dir);
}
if (!is_writable($dir)) {
throw new IOException(sprintf('Unable to write to the "%s" directory.', $dir), 0, null, $dir);
}
// Will create a temp file with 0600 access rights
// when the filesystem supports chmod.
$tmpFile = $this->tempnam($dir, basename($filename));
if (false === @file_put_contents($tmpFile, $content)) {
throw new IOException(sprintf('Failed to write file "%s".', $filename), 0, null, $filename);
}
@chmod($tmpFile, file_exists($filename) ? fileperms($filename) : 0666 & ~umask());
$this->rename($tmpFile, $filename, true);
}
/**
* Appends content to an existing file.
*
* @param string $filename The file to which to append content
* @param string $content The content to append
*
* @throws IOException If the file is not writable
*/
public function appendToFile($filename, $content)
{
$dir = dirname($filename);
if (!is_dir($dir)) {
$this->mkdir($dir);
}
if (!is_writable($dir)) {
throw new IOException(sprintf('Unable to write to the "%s" directory.', $dir), 0, null, $dir);
}
if (false === @file_put_contents($filename, $content, FILE_APPEND)) {
throw new IOException(sprintf('Failed to write file "%s".', $filename), 0, null, $filename);
}
}
/**
* @param mixed $files
*
* @return \Traversable
*/
private function toIterator($files)
{
if (!$files instanceof \Traversable) {
$files = new \ArrayObject(is_array($files) ? $files : array($files));
}
return $files;
}
/**
* Gets a 2-tuple of scheme (may be null) and hierarchical part of a filename (e.g. file:///tmp -> array(file, tmp)).
*
* @param string $filename The filename to be parsed
*
* @return array The filename scheme and hierarchical part
*/
private function getSchemeAndHierarchy($filename)
{
$components = explode('://', $filename, 2);
return 2 === count($components) ? array($components[0], $components[1]) : array(null, $components[0]);
}
}