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vendor/symfony/flex/src/Update/DiffHelper.php

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+<?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\Flex\Update;
+
+class DiffHelper
+{
+    public static function removeFilesFromPatch(string $patch, array $files, array &$removedPatches): string
+    {
+        foreach ($files as $filename) {
+            $start = strpos($patch, sprintf('diff --git a/%s b/%s', $filename, $filename));
+            if (false === $start) {
+                throw new \LogicException(sprintf('Could not find file "%s" in the patch.', $filename));
+            }
+
+            $end = strpos($patch, 'diff --git a/', $start + 1);
+            $contentBefore = substr($patch, 0, $start);
+            if (false === $end) {
+                // last patch in the file
+                $removedPatches[$filename] = rtrim(substr($patch, $start), "\n");
+                $patch = rtrim($contentBefore, "\n");
+
+                continue;
+            }
+
+            $removedPatches[$filename] = rtrim(substr($patch, $start, $end - $start), "\n");
+            $patch = $contentBefore.substr($patch, $end);
+        }
+
+        // valid patches end with a blank line
+        if ($patch && "\n" !== substr($patch, \strlen($patch) - 1, 1)) {
+            $patch = $patch."\n";
+        }
+
+        return $patch;
+    }
+}

vendor/symfony/flex/src/Update/RecipePatch.php

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+<?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\Flex\Update;
+
+class RecipePatch
+{
+    private $patch;
+    private $blobs;
+    private $removedPatches;
+
+    public function __construct(string $patch, array $blobs, array $removedPatches = [])
+    {
+        $this->patch = $patch;
+        $this->blobs = $blobs;
+        $this->removedPatches = $removedPatches;
+    }
+
+    public function getPatch(): string
+    {
+        return $this->patch;
+    }
+
+    public function getBlobs(): array
+    {
+        return $this->blobs;
+    }
+
+    /**
+     * Patches for modified files that were removed because the file
+     * has been deleted in the user's project.
+     */
+    public function getRemovedPatches(): array
+    {
+        return $this->removedPatches;
+    }
+}

vendor/symfony/flex/src/Update/RecipePatcher.php

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+<?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\Flex\Update;
+
+use Composer\IO\IOInterface;
+use Composer\Util\ProcessExecutor;
+use Symfony\Component\Filesystem\Exception\IOException;
+use Symfony\Component\Filesystem\Filesystem;
+
+class RecipePatcher
+{
+    private $rootDir;
+    private $filesystem;
+    private $io;
+    private $processExecutor;
+
+    public function __construct(string $rootDir, IOInterface $io)
+    {
+        $this->rootDir = $rootDir;
+        $this->filesystem = new Filesystem();
+        $this->io = $io;
+        $this->processExecutor = new ProcessExecutor($io);
+    }
+
+    /**
+     * Applies the patch. If it fails unexpectedly, an exception will be thrown.
+     *
+     * @return bool returns true if fully successful, false if conflicts were encountered
+     */
+    public function applyPatch(RecipePatch $patch): bool
+    {
+        if (!$patch->getPatch()) {
+            // nothing to do!
+            return true;
+        }
+
+        $addedBlobs = $this->addMissingBlobs($patch->getBlobs());
+
+        $patchPath = $this->rootDir.'/_flex_recipe_update.patch';
+        file_put_contents($patchPath, $patch->getPatch());
+
+        try {
+            $this->execute('git update-index --refresh', $this->rootDir);
+
+            $output = '';
+            $statusCode = $this->processExecutor->execute('git apply "_flex_recipe_update.patch" -3', $output, $this->rootDir);
+
+            if (0 === $statusCode) {
+                // successful with no conflicts
+                return true;
+            }
+
+            if (false !== strpos($this->processExecutor->getErrorOutput(), 'with conflicts')) {
+                // successful with conflicts
+                return false;
+            }
+
+            throw new \LogicException('Error applying the patch: '.$this->processExecutor->getErrorOutput());
+        } finally {
+            unlink($patchPath);
+            // clean up any temporary blobs
+            foreach ($addedBlobs as $filename) {
+                unlink($filename);
+            }
+        }
+    }
+
+    public function generatePatch(array $originalFiles, array $newFiles): RecipePatch
+    {
+        // null implies "file does not exist"
+        $originalFiles = array_filter($originalFiles, function ($file) {
+            return null !== $file;
+        });
+        $newFiles = array_filter($newFiles, function ($file) {
+            return null !== $file;
+        });
+
+        // find removed files and add them so they will be deleted
+        foreach ($originalFiles as $file => $contents) {
+            if (!isset($newFiles[$file])) {
+                $newFiles[$file] = null;
+            }
+        }
+
+        // If a file is being modified, but does not exist in the current project,
+        // it cannot be patched. We generate the diff for these, but then remove
+        // it from the patch (and optionally report this diff to the user).
+        $modifiedFiles = array_intersect_key(array_keys($originalFiles), array_keys($newFiles));
+        $deletedModifiedFiles = [];
+        foreach ($modifiedFiles as $modifiedFile) {
+            if (!file_exists($this->rootDir.'/'.$modifiedFile) && $originalFiles[$modifiedFile] !== $newFiles[$modifiedFile]) {
+                $deletedModifiedFiles[] = $modifiedFile;
+            }
+        }
+
+        $tmpPath = sys_get_temp_dir().'/_flex_recipe_update'.uniqid(mt_rand(), true);
+        $this->filesystem->mkdir($tmpPath);
+
+        try {
+            $this->execute('git init', $tmpPath);
+            $this->execute('git config commit.gpgsign false', $tmpPath);
+            $this->execute('git config user.name "Flex Updater"', $tmpPath);
+            $this->execute('git config user.email ""', $tmpPath);
+
+            $blobs = [];
+            if (\count($originalFiles) > 0) {
+                $this->writeFiles($originalFiles, $tmpPath);
+                $this->execute('git add -A', $tmpPath);
+                $this->execute('git commit -m "original files"', $tmpPath);
+
+                $blobs = $this->generateBlobs($originalFiles, $tmpPath);
+            }
+
+            $this->writeFiles($newFiles, $tmpPath);
+            $this->execute('git add -A', $tmpPath);
+
+            $patchString = $this->execute('git diff --cached', $tmpPath);
+            $removedPatches = [];
+            $patchString = DiffHelper::removeFilesFromPatch($patchString, $deletedModifiedFiles, $removedPatches);
+
+            return new RecipePatch(
+                $patchString,
+                $blobs,
+                $removedPatches
+            );
+        } finally {
+            try {
+                $this->filesystem->remove($tmpPath);
+            } catch (IOException $e) {
+                // this can sometimes fail due to git file permissions
+                // if that happens, just leave it: we're in the temp directory anyways
+            }
+        }
+    }
+
+    private function writeFiles(array $files, string $directory): void
+    {
+        foreach ($files as $filename => $contents) {
+            $path = $directory.'/'.$filename;
+            if (null === $contents) {
+                if (file_exists($path)) {
+                    unlink($path);
+                }
+
+                continue;
+            }
+
+            if (!file_exists(\dirname($path))) {
+                $this->filesystem->mkdir(\dirname($path));
+            }
+            file_put_contents($path, $contents);
+        }
+    }
+
+    private function execute(string $command, string $cwd): string
+    {
+        $output = '';
+        $statusCode = $this->processExecutor->execute($command, $output, $cwd);
+
+        if (0 !== $statusCode) {
+            throw new \LogicException(sprintf('Command "%s" failed: "%s". Output: "%s".', $command, $this->processExecutor->getErrorOutput(), $output));
+        }
+
+        return $output;
+    }
+
+    /**
+     * Adds git blobs for each original file.
+     *
+     * For patching to work, each original file & contents needs to be
+     * available to git as a blob. This is because the patch contains
+     * the ref to the original blob, and git uses that to find the
+     * original file (which is needed for the 3-way merge).
+     */
+    private function addMissingBlobs(array $blobs): array
+    {
+        $addedBlobs = [];
+        foreach ($blobs as $hash => $contents) {
+            $blobPath = $this->rootDir.'/'.$this->getBlobPath($hash);
+            if (file_exists($blobPath)) {
+                continue;
+            }
+
+            $addedBlobs[] = $blobPath;
+            if (!file_exists(\dirname($blobPath))) {
+                $this->filesystem->mkdir(\dirname($blobPath));
+            }
+            file_put_contents($blobPath, $contents);
+        }
+
+        return $addedBlobs;
+    }
+
+    private function generateBlobs(array $originalFiles, string $originalFilesRoot): array
+    {
+        $addedBlobs = [];
+        foreach ($originalFiles as $filename => $contents) {
+            // if the file didn't originally exist, no blob needed
+            if (!file_exists($originalFilesRoot.'/'.$filename)) {
+                continue;
+            }
+
+            $hash = trim($this->execute('git hash-object '.ProcessExecutor::escape($filename), $originalFilesRoot));
+            $addedBlobs[$hash] = file_get_contents($originalFilesRoot.'/'.$this->getBlobPath($hash));
+        }
+
+        return $addedBlobs;
+    }
+
+    private function getBlobPath(string $hash): string
+    {
+        $hashStart = substr($hash, 0, 2);
+        $hashEnd = substr($hash, 2);
+
+        return '.git/objects/'.$hashStart.'/'.$hashEnd;
+    }
+}

vendor/symfony/flex/src/Update/RecipeUpdate.php

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+<?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\Flex\Update;
+
+use Symfony\Flex\Lock;
+use Symfony\Flex\Recipe;
+
+class RecipeUpdate
+{
+    private $originalRecipe;
+    private $newRecipe;
+    private $lock;
+    private $rootDir;
+
+    /** @var string[] */
+    private $originalRecipeFiles = [];
+    /** @var string[] */
+    private $newRecipeFiles = [];
+    private $copyFromPackagePaths = [];
+
+    public function __construct(Recipe $originalRecipe, Recipe $newRecipe, Lock $lock, string $rootDir)
+    {
+        $this->originalRecipe = $originalRecipe;
+        $this->newRecipe = $newRecipe;
+        $this->lock = $lock;
+        $this->rootDir = $rootDir;
+    }
+
+    public function getOriginalRecipe(): Recipe
+    {
+        return $this->originalRecipe;
+    }
+
+    public function getNewRecipe(): Recipe
+    {
+        return $this->newRecipe;
+    }
+
+    public function getLock(): Lock
+    {
+        return $this->lock;
+    }
+
+    public function getRootDir(): string
+    {
+        return $this->rootDir;
+    }
+
+    public function getPackageName(): string
+    {
+        return $this->originalRecipe->getName();
+    }
+
+    public function setOriginalFile(string $filename, ?string $contents): void
+    {
+        $this->originalRecipeFiles[$filename] = $contents;
+    }
+
+    public function setNewFile(string $filename, ?string $contents): void
+    {
+        $this->newRecipeFiles[$filename] = $contents;
+    }
+
+    public function addOriginalFiles(array $files)
+    {
+        foreach ($files as $file => $contents) {
+            if (null === $contents) {
+                continue;
+            }
+
+            $this->setOriginalFile($file, $contents);
+        }
+    }
+
+    public function addNewFiles(array $files)
+    {
+        foreach ($files as $file => $contents) {
+            if (null === $contents) {
+                continue;
+            }
+
+            $this->setNewFile($file, $contents);
+        }
+    }
+
+    public function getOriginalFiles(): array
+    {
+        return $this->originalRecipeFiles;
+    }
+
+    public function getNewFiles(): array
+    {
+        return $this->newRecipeFiles;
+    }
+
+    public function getCopyFromPackagePaths(): array
+    {
+        return $this->copyFromPackagePaths;
+    }
+
+    public function addCopyFromPackagePath(string $source, string $target)
+    {
+        $this->copyFromPackagePaths[$source] = $target;
+    }
+}