Composer self-update as admin

elevate-demo2.php

<?php

/**
 * This demo shows a method for elevating to an Admin on Windows and running
 * a command in cmd.exe, from a PHP script. It demonstrates how Composer can
 * self-update to an Admin location.
 *
 * Note that it creates composer-phar.txt file in the current directory.
 */

$localFilename = ''; // the location where composer.phar is to be installed
$newFilename = '';   // the location of the downloaded (or rollback) composer.phar
$interactive = true; // assume we are interactive

echo "Upgrading to version '3.0.0' (stable channel).", PHP_EOL;

// Assume rename($newFilename, $localFilename) fails

if (!$interactive) {
    return 1;
}

$cygwin = preg_match('/cygwin/i', php_uname());
if (!$cygwin && !defined('PHP_WINDOWS_VERSION_BUILD')) {
    return 1;
}

// See if we are already an admin
exec('cmd.exe /c fltmc.exe filters', $output, $exitCode);
if ($exitCode === 0) {
    return 1;
}

// Set up dummy files
$localFilename = __DIR__.DIRECTORY_SEPARATOR.'composer-phar.txt';
$newFilename = @tempnam(sys_get_temp_dir(), '');
file_put_contents($newFilename, sprintf('composer phar content %s', microtime()));

echo sprintf('Unable to write to the "%s" directory. Access is denied.', dirname($localFilename)), PHP_EOL;
$question = '    Complete this operation with Administrator priviledges [yes]? ';
$answer = readline($question);
$cancelledMsg = 'Operation cancelled. Please run the self-update command as an Administrator.'.PHP_EOL;

if (!preg_match('/^y/i', $answer)) {
    echo $cancelledMsg;
    return 1;
}

$hashFunc = function($filename) {
    return file_exists($filename) ? hash_file('sha3-384', $filename) : '';
};

$newFilenameHash = $hashFunc($newFilename);

$tmpFile = @tempnam(sys_get_temp_dir(), '');
$script = $tmpFile.'.ps1';
rename($tmpFile, $script);


// Format the file names for cmd.exe
if ($cygwin) {
    $cygwinLocalFilename = $localFilename;
    $localFilename = exec(sprintf("cygpath -w '%s'", $localFilename));
    $newFilename = exec(sprintf("cygpath -w '%s'", $newFilename));
} else {
    // cmd.exe move seems to be fussy about backslashes
    $localFilename = str_replace('/', '\\', $localFilename);
    $newFilename = str_replace('/', '\\', $newFilename);
}

$ps1 = <<<EOT
\$exitCode = 0
try {
    # Use an elevated cmd.exe to move new filename to local filename
    Start-Process -FilePath "\$env:comspec" -ArgumentList "/c move /y `"$newFilename`" `"$localFilename`"" -Verb RunAs -WindowStyle Hidden
} catch {
    \$exitCode = 2
}

exit \$exitCode
EOT;

file_put_contents($script, $ps1);

if ($cygwin) {
    $winPath = exec(sprintf("cygpath -w '%s'", $tmpFile));
    $script = $winPath.'.ps1';
}

$output = null;
$command = sprintf('powershell.exe -ExecutionPolicy Bypass -WindowStyle Hidden -File "%s"', $script);
exec($command, $output, $exitCode);
@unlink($script);

if ($exitCode === 0) {
    // see if the file was moved
    usleep(300000);
    $localFilename = $cygwin ? $cygwinLocalFilename : $localFilename;
    $hash = $hashFunc($localFilename);

    if ($hash && $hash === $newFilenameHash) {
        echo 'Operation succeeded.'.PHP_EOL;
        return 0;
    } else {
        echo 'Operation failed (file not written). Please run the self-update command as an Administrator.'.PHP_EOL;
        return 1;
    }
} elseif ($exitCode === 2) {
    echo $cancelledMsg;
    return 1;
} else {
    echo 'Operation failed (unabled to run Powershell script). Please run the self-update command as an Administrator.'.PHP_EOL;

    if ($output) {
        echo 'Error: ', implode(PHP_EOL, $output), PHP_EOL;
    }
    return 1;
}