Getting an error "proc_open() expects parameter 1 to be string, array given"

[SadeeshKumarMN]

Problem Statement: While execute the script composer db-docker -vvv --db-file=<<name of the db file>> getting an error:

[ErrorException]
  proc_open() expects parameter 1 to be string, array given

Other Details:

• Composer Version:2.0.11
• Drupal Version: 8.9.6

ExceptionTrace:

 () at phar:///usr/local/bin/composer/vendor/symfony/process/Process.php:285
 Composer\Util\ErrorHandler::handle() at n/a:n/a
 proc_open() at phar:///usr/local/bin/composer/vendor/symfony/process/Process.php:285
 Symfony\Component\Process\Process->start() at phar:///usr/local/bin/composer/vendor/symfony/process/Process.php:196
 Symfony\Component\Process\Process->run() at /Users/sadeeshkumarmn/Desktop/code/cypress-drupal-ci/cypress-drupal-gitlab/vendor/axelerant/db-docker/src/DbDockerCommand.php:280
 Axelerant\DbDocker\DbDockerCommand->execCmd() at /Users/sadeeshkumarmn/Desktop/code/cypress-drupal-ci/cypress-drupal-gitlab/vendor/axelerant/db-docker/src/DbDockerCommand.php:256
 Axelerant\DbDocker\DbDockerCommand->buildImage() at /Users/sadeeshkumarmn/Desktop/code/cypress-drupal-ci/cypress-drupal-gitlab/vendor/axelerant/db-docker/src/DbDockerCommand.php:86
 Axelerant\DbDocker\DbDockerCommand->execute() at phar:///usr/local/bin/composer/vendor/symfony/console/Command/Command.php:245
 Symfony\Component\Console\Command\Command->run() at phar:///usr/local/bin/composer/vendor/symfony/console/Application.php:835
 Symfony\Component\Console\Application->doRunCommand() at phar:///usr/local/bin/composer/vendor/symfony/console/Application.php:185
 Symfony\Component\Console\Application->doRun() at phar:///usr/local/bin/composer/src/Composer/Console/Application.php:310
 Composer\Console\Application->doRun() at phar:///usr/local/bin/composer/vendor/symfony/console/Application.php:117
 Symfony\Component\Console\Application->run() at phar:///usr/local/bin/composer/src/Composer/Console/Application.php:122
 Composer\Console\Application->run() at phar:///usr/local/bin/composer/bin/composer:63
 require() at /usr/local/bin/composer:24

db-docker [-t|--docker-tag [DOCKER-TAG]] [-r|--git-remote [GIT-REMOTE]] [-s|--db-source [DB-SOURCE]] [-f|--db-file [DB-FILE]] [--no-push]

Project Repo:
https://gitorious.xyz/sadeesh.kumar/cypress-drupal-gitlab

[hussainweb]

After analysis, I am seeing this happens because db-docker uses the symfony/process component which is embedded inside the composer phar file. This is built with version 2.8.52 of symfony/process (see its composer.lock).

This version of symfony/process does not support arrays at all (the support was added in version 3.3). What's strange is how is this working at all (because it is working in other cases). I am currently investigating this.

As for the fix, I am thinking of adding support for the ProcessBuilder class (which was deprecated in 3.4.0 and removed in 4.0. Naturally, the support should be conditional should composer decide to update the version at any time.

[hussainweb]

I see why it works in my tests. As of PHP 7.4, proc_open now supports array for the command-line parameter and handles the escaping by itself. @SadeeshKumarMN, I suppose you are on an older PHP version, right?

In any case, we intend to support PHP 7.3 at least, for now. So, we still need to implement a workaround.

[SadeeshKumarMN]

@hussainweb Still observe a different error after upgrade to PHP 7.4. Raised an issue for tracking. Please look into this