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@@ -0,0 +1,74 @@
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+<?php
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+
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+/*
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+ * This file is part of Composer.
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+ *
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+ * (c) Nils Adermann <naderman@naderman.de>
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+ * Jordi Boggiano <j.boggiano@seld.be>
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+ *
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+ * For the full copyright and license information, please view the LICENSE
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+ * file that was distributed with this source code.
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+ */
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+
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+namespace Composer\Downloader;
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+
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+use Composer\Package\PackageInterface;
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+
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+/**
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+ * @author Per Bernhardt <plb@webfactory.de>
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+ */
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+class HgDownloader implements DownloaderInterface
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+{
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+ /**
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+ * {@inheritDoc}
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+ */
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+ public function getInstallationSource()
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+ {
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+ return 'source';
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+ }
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+
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+ /**
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+ * {@inheritDoc}
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+ */
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+ public function download(PackageInterface $package, $path)
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+ {
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+ if (!$package->getSourceReference()) {
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+ throw new \InvalidArgumentException('The given package is missing reference information');
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+ }
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+
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+ $url = escapeshellarg($package->getSourceUrl());
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+ $ref = escapeshellarg($package->getSourceReference());
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+ system(sprintf('hg clone %s %s && cd %2$s && hg up %s', $url, $path, $ref));
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+ }
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+
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+ /**
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+ * {@inheritDoc}
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+ */
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+ public function update(PackageInterface $initial, PackageInterface $target, $path)
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+ {
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+ if (!$target->getSourceReference()) {
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+ throw new \InvalidArgumentException('The given package is missing reference information');
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+ }
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+
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+ $this->enforceCleanDirectory($path);
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+ system(sprintf('cd %s && hg pull && hg up %s', $path, $target->getSourceReference()));
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+ }
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+
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+ /**
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+ * {@inheritDoc}
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+ */
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+ public function remove(PackageInterface $package, $path)
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+ {
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+ $this->enforceCleanDirectory($path);
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+ $fs = new Util\Filesystem();
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+ $fs->remove($path);
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+ }
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+
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+ private function enforceCleanDirectory($path)
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+ {
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+ exec(sprintf('cd %s && hg st', $path), $output);
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+ if (implode('', $output)) {
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+ throw new \RuntimeException('Source directory has uncommitted changes');
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+ }
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+ }
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+}
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