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<?php
/*
* This file is part of Composer.
*
* (c) Nils Adermann <naderman@naderman.de>
* Jordi Boggiano <j.boggiano@seld.be>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Composer\Downloader;
use Composer\Package\Archiver\ArchivableFilesFinder;
use Composer\Package\Dumper\ArrayDumper;
use Composer\Package\PackageInterface;
use Composer\Package\Version\VersionGuesser;
use Composer\Package\Version\VersionParser;
use Composer\Util\Platform;
use Composer\Util\Filesystem;
use Symfony\Component\Filesystem\Exception\IOException;
use Symfony\Component\Filesystem\Filesystem as SymfonyFilesystem;
use Composer\DependencyResolver\Operation\InstallOperation;
use Composer\DependencyResolver\Operation\UninstallOperation;
/**
* Download a package from a local path.
*
* @author Samuel Roze <samuel.roze@gmail.com>
* @author Johann Reinke <johann.reinke@gmail.com>
*/
class PathDownloader extends FileDownloader implements VcsCapableDownloaderInterface
{
const STRATEGY_SYMLINK = 10;
const STRATEGY_MIRROR = 20;
/**
* {@inheritdoc}
*/
public function download(PackageInterface $package, $path, PackageInterface $prevPackage = null, $output = true)
{
$path = Filesystem::trimTrailingSlash($path);
$url = $package->getDistUrl();
$realUrl = realpath($url);
if (false === $realUrl || !file_exists($realUrl) || !is_dir($realUrl)) {
throw new \RuntimeException(sprintf(
'Source path "%s" is not found for package %s',
$url,
$package->getName()
));
}
if (realpath($path) === $realUrl) {
return;
}
if (strpos(realpath($path) . DIRECTORY_SEPARATOR, $realUrl . DIRECTORY_SEPARATOR) === 0) {
// IMPORTANT NOTICE: If you wish to change this, don't. You are wasting your time and ours.
//
// Please see https://github.com/composer/composer/pull/5974 and https://github.com/composer/composer/pull/6174
// for previous attempts that were shut down because they did not work well enough or introduced too many risks.
throw new \RuntimeException(sprintf(
'Package %s cannot install to "%s" inside its source at "%s"',
$package->getName(),
realpath($path),
$realUrl
));
}
}
/**
* {@inheritdoc}
*/
public function install(PackageInterface $package, $path, $output = true)
{
$path = Filesystem::trimTrailingSlash($path);
$url = $package->getDistUrl();
$realUrl = realpath($url);
if (realpath($path) === $realUrl) {
if ($output) {
$this->io->writeError(" - " . InstallOperation::format($package).': Source already present');
} else {
$this->io->writeError('Source already present', false);
}
return;
}
// Get the transport options with default values
$transportOptions = $package->getTransportOptions() + array('symlink' => null, 'relative' => true);
// When symlink transport option is null, both symlink and mirror are allowed
$currentStrategy = self::STRATEGY_SYMLINK;
$allowedStrategies = array(self::STRATEGY_SYMLINK, self::STRATEGY_MIRROR);
$mirrorPathRepos = getenv('COMPOSER_MIRROR_PATH_REPOS');
if ($mirrorPathRepos) {
$currentStrategy = self::STRATEGY_MIRROR;
}
if (true === $transportOptions['symlink']) {
$currentStrategy = self::STRATEGY_SYMLINK;
$allowedStrategies = array(self::STRATEGY_SYMLINK);
} elseif (false === $transportOptions['symlink']) {
$currentStrategy = self::STRATEGY_MIRROR;
$allowedStrategies = array(self::STRATEGY_MIRROR);
}
// Check we can use junctions safely if we are on Windows
if (Platform::isWindows() && self::STRATEGY_SYMLINK === $currentStrategy && !$this->safeJunctions()) {
$currentStrategy = self::STRATEGY_MIRROR;
$allowedStrategies = array(self::STRATEGY_MIRROR);
}
$symfonyFilesystem = new SymfonyFilesystem();
$this->filesystem->removeDirectory($path);
if ($output) {
$this->io->writeError(" - " . InstallOperation::format($package).': ', false);
}
$isFallback = false;
if (self::STRATEGY_SYMLINK == $currentStrategy) {
try {
if (Platform::isWindows()) {
// Implement symlinks as NTFS junctions on Windows
$this->io->writeError(sprintf('Junctioning from %s', $url), false);
$this->filesystem->junction($realUrl, $path);
} else {
$absolutePath = $path;
if (!$this->filesystem->isAbsolutePath($absolutePath)) {
$absolutePath = getcwd() . DIRECTORY_SEPARATOR . $path;
}
$shortestPath = $this->filesystem->findShortestPath($absolutePath, $realUrl);
$path = rtrim($path, "/");
$this->io->writeError(sprintf('Symlinking from %s', $url), false);
if ($transportOptions['relative']) {
$symfonyFilesystem->symlink($shortestPath, $path);
} else {
$symfonyFilesystem->symlink($realUrl, $path);
}
}
} catch (IOException $e) {
if (in_array(self::STRATEGY_MIRROR, $allowedStrategies)) {
$this->io->writeError('');
$this->io->writeError(' <error>Symlink failed, fallback to use mirroring!</error>');
$currentStrategy = self::STRATEGY_MIRROR;
$isFallback = true;
} else {
throw new \RuntimeException(sprintf('Symlink from "%s" to "%s" failed!', $realUrl, $path));
}
}
}
// Fallback if symlink failed or if symlink is not allowed for the package
if (self::STRATEGY_MIRROR == $currentStrategy) {
$realUrl = $this->filesystem->normalizePath($realUrl);
$this->io->writeError(sprintf('%sMirroring from %s', $isFallback ? ' ' : '', $url), false);
$iterator = new ArchivableFilesFinder($realUrl, array());
$symfonyFilesystem->mirror($realUrl, $path, $iterator);
}
if ($output) {
$this->io->writeError('');
}
}
/**
* {@inheritDoc}
*/
public function remove(PackageInterface $package, $path, $output = true)
{
$path = Filesystem::trimTrailingSlash($path);
/**
* realpath() may resolve Windows junctions to the source path, so we'll check for a junction first
* to prevent a false positive when checking if the dist and install paths are the same.
* See https://bugs.php.net/bug.php?id=77639
*
* For junctions don't blindly rely on Filesystem::removeDirectory as it may be overzealous. If a process
* inadvertently locks the file the removal will fail, but it would fall back to recursive delete which
* is disastrous within a junction. So in that case we have no other real choice but to fail hard.
*/
if (Platform::isWindows() && $this->filesystem->isJunction($path)) {
if ($output) {
$this->io->writeError(" - " . UninstallOperation::format($package).", source is still present in $path");
}
if (!$this->filesystem->removeJunction($path)) {
$this->io->writeError(" <warning>Could not remove junction at " . $path . " - is another process locking it?</warning>");
throw new \RuntimeException('Could not reliably remove junction for package ' . $package->getName());
}
} elseif (realpath($path) === realpath($package->getDistUrl())) {
if ($output) {
$this->io->writeError(" - " . UninstallOperation::format($package).", source is still present in $path");
}
} else {
parent::remove($package, $path, $output);
}
}
/**
* {@inheritDoc}
*/
public function getVcsReference(PackageInterface $package, $path)
{
$path = Filesystem::trimTrailingSlash($path);
$parser = new VersionParser;
$guesser = new VersionGuesser($this->config, $this->process, $parser);
$dumper = new ArrayDumper;
$packageConfig = $dumper->dump($package);
if ($packageVersion = $guesser->guessVersion($packageConfig, $path)) {
return $packageVersion['commit'];
}
}
/**
* Returns true if junctions can be created and safely used on Windows
*
* A PHP bug makes junction detection fragile, leading to possible data loss
* when removing a package. See https://bugs.php.net/bug.php?id=77552
*
* For safety we require a minimum version of Windows 7, so we can call the
* system rmdir which will preserve target content if given a junction.
*
* The PHP bug was fixed in 7.2.16 and 7.3.3 (requires at least Windows 7).
*
* @return bool
*/
private function safeJunctions()
{
// We need to call mklink, and rmdir on Windows 7 (version 6.1)
return function_exists('proc_open') &&
(PHP_WINDOWS_VERSION_MAJOR > 6 ||
(PHP_WINDOWS_VERSION_MAJOR === 6 && PHP_WINDOWS_VERSION_MINOR >= 1));
}
}
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