checkTarContentsMd5.function.php

<?php

/**
 * @param string $dir The dir to be removed
 */
function deleteTempDir($dir)
{
    return `rm -fr $dir`;
}


/**
 * @author Luiz “Felds” Liscia (felds@seepix.comm.br)
 * @version 1.0.0 (2013-07-23)
 *
 * @param string $tar The tar file
 * @param array $expected How does the Tar should be?
 * @return boolean
 */
function checkTarContentsMd5($tar, array $expected)
{
    // check args
    if (!is_file($tar)) {
        throw new RuntimeException("Tar $tar not found.");
    }
    if (!is_readable($tar)) {
        throw new RuntimeException("Tar $tar is unreadable.");
    }

    $tarBin = trim(`which tar`);
    if (!$tarBin) {
        throw new RuntimeException("tar binary not found.");
    }



    // extract tar contents
    $baseDir = realpath(dirname($tar));     // dir in which the tar is located
    $tarName = basename($tar);              // the name of the tar file without the path
    $tempDir = $baseDir . '/tmp/';          // the directory that will hold the files
    $tempTar = $tempDir . $tarName;         // the temporary tar to be extracted

    @mkdir($tempDir, 0777, true);
    @copy($tar, $tempTar);
    register_shutdown_function('deleteTempDir', $tempDir); // mark the temp dir for death

    $cmd = sprintf(
        'cd %s; tar xvf %s 2>&1 | grep -v /\\$ | cut -d" " -f2',
        escapeshellarg($tempDir),
        escapeshellarg($tarName)
    );
    exec($cmd, $output, $returnVar);

    if ($returnVar !== 0) {
        throw new RuntimeException("Command failed.");
    }



    // prepare the array
    $md5Sums = array();
    foreach ($output as $file) {
        $md5Sums[$file] = md5_file($tempDir . $file);
    }



    // compare!
    if (count($md5Sums) !== count($expected)) {
        $expectedCount = count($expected);
        $actualCount = count($md5Sums);
        throw new LengthException("The number of expected files ($expectedCount) doesn't match the number of files in the Tar archive ($actualCount).");
    }

    foreach ($md5Sums as $file => $hash) {
        if (!array_key_exists($file, $expected)) {
            throw new RuntimeException("The file $file wasn't expected.");
        }

        if ($hash !== $expected[$file]) {
            throw new RuntimeException("The file $file has the wrong hash. (it is: $hash; it should be: {$expected[$file]})");
        }
    }


    return true;
}

if (class_exists('PHPUnit_Framework_TestCase')) {
    class CheckTarContentsMd5FunctionTest extends PHPUnit_Framework_TestCase
    {
        public function setUp()
        {
            $this->tarFile = 'test.tgz';
            $this->expected = array(
                'file1.txt' => 'f737a087bca81f69a6048ec744c73e41',
                'file2.txt' => '02063b9bf9d6e15ad61226fa4584aae0',
                'file3.txt' => '5f20730ddc7a1fedbf265358f0ce4f26',
                'folder/file-inside-the-folder.txt' => 'bc8ff7c3fe2a8d0fb07061c6d7ae8e8a',
            );
        }

        public function testSuccess()
        {
            $success = checkTarContentsMd5($this->tarFile, $this->expected);

            $this->assertTrue($success);
        }

        /**
         * @expectedException LengthException
         **/
        public function testFailByLength()
        {
            $failArray = $this->expected;
            array_pop($failArray);

            checkTarContentsMd5($this->tarFile, $failArray);
        }

        /**
         * @expectedException RuntimeException
         **/
        public function testFailByHash()
        {
            $failArray = $this->expected;
            $failArray['file3.txt'] = '23456787654345678998765456';

            checkTarContentsMd5($this->tarFile, $failArray);
        }
    }
}

test.tgz