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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\ProcessExecutor;
use Composer\Util\Filesystem as ComposerFilesystem;
use Symfony\Component\Filesystem\Exception\IOException;
use Symfony\Component\Filesystem\Filesystem;
/**
* 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, $output = true)
{
$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, $package->getName()
));
}
if (strpos(realpath($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
));
}
// Get the transport options with default values
$transportOptions = $package->getTransportOptions() + array('symlink' => null);
// 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);
}
$fileSystem = new Filesystem();
$this->filesystem->removeDirectory($path);
if ($output) {
$this->io->writeError(sprintf(
' - Installing <info>%s</info> (<comment>%s</comment>): ',
$package->getName(),
$package->getFullPrettyVersion()
), 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);
$fileSystem->symlink($shortestPath, $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) {
$fs = new ComposerFilesystem();
$realUrl = $fs->normalizePath($realUrl);
$this->io->writeError(sprintf('%sMirroring from %s', $isFallback ? ' ' : '', $url), false);
$iterator = new ArchivableFilesFinder($realUrl, array());
$fileSystem->mirror($realUrl, $path, $iterator);
}
$this->io->writeError('');
}
/**
* {@inheritDoc}
*/
public function remove(PackageInterface $package, $path, $output = true)
{
/**
* 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(" - Removing junction for <info>" . $package->getName() . "</info> (<comment>" . $package->getFullPrettyVersion() . "</comment>)");
}
if (!$this->filesystem->removeJunction($path)) {
$this->io->writeError(" <warn>Could not remove junction at " . $path . " - is another process locking it?</warn>");
throw new \RuntimeException('Could not reliably remove junction for package ' . $package->getName());
}
} else {
parent::remove($package, $path, $output);
}
}
/**
* {@inheritDoc}
*/
public function getVcsReference(PackageInterface $package, $path)
{
$parser = new VersionParser;
$guesser = new VersionGuesser($this->config, new ProcessExecutor($this->io), $parser);
$dumper = new ArrayDumper;
$packageConfig = $dumper->dump($package);
if ($packageVersion = $guesser->guessVersion($packageConfig, $path)) {
return $packageVersion['commit'];
}
}
}
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