Problems installing Drupal Console 1.9.4 on a fresh Drupal 8.8.5 site

Your requirements could not be resolved to an installable set of packages. ;-(
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Your requirements could not be resolved to an installable set of packages. ;-(
Electric Larry
11.April 2020

Installing Drupal Console 1.9.4 on a fresh Drupal 8.8.5 site


I just installed a fresh Drupal 8.8.5 site using Drupals "new" recommended-project Composer template:


composer create-project drupal/recommended-project ./


Download and setup are working flawlessly, but when I try to require Drupal Console (currently at v1.9.4) I end up with a bunch of Composer errors:


$ composer require drupal/console:~1.10 ~prefer-dist --optimize-autoloader

./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

Problem 1
    - drupal/console 1.9.4 requires drupal/console-core 1.9.4 -> satisfiable by drupal/console-core[1.9.4].
    - Conclusion: don't install drupal/console-core 1.9.4
    - Conclusion: remove symfony/filesystem v4.4.7
    - Installation request for drupal/console ^1.9 -> satisfiable by drupal/console[1.9.1, 1.9.2, 1.9.3, 1.9.4, v1.9.0]
    - drupal/console-core v1.9.0 requires symfony/filesystem ~2.8|~3.0 -> satisfiable by symfony/filesystem[ .... ]
    - Can only install one of: symfony/filesystem[v3.3.9, v4.4.7].
    - Installation request for symfony/filesystem (locked at v4.4.7) -> satisfiable by symfony/filesystem[v4.4.7].


And there's a lot more lines like those above. Obviously Composer complains that drupal/console does not like symfony/filesystem v4.x, it requires some 3.x version. If you only downgrade symfony/filesystem to the latest 3.x version you'll run into another error:


    - Installation request for symfony/dependency-injection (locked at v3.4.35) -> satisfiable by symfony/dependency-injection[v3.4.35].
    - Conclusion: don't install drupal/console-core 1.0.1|remove symfony/finder v4.4.7|install symfony/finder 2.8.x-dev|install symfony/finder 2.8.x-dev|install symfony/finder 3.0.x-dev|install symfony/finder 3.1.x-dev .... |install symfony/finder v3.2.8|install symfony/finder v3.2.9
    - Installation request for symfony/finder (locked at v4.4.7) -> satisfiable by symfony/finder[v4.4.7].


Well, symfony/finder version seems to be a problem too. Let's check the installed symfony packages:


$ composer show symfony/*
symfony/class-loader            v3.4.35 Symfony ClassLoader Component
symfony/console                 v3.4.35 Symfony Console Component
symfony/debug                   v3.4.35 Symfony Debug Component
symfony/dependency-injection    v3.4.35 Symfony DependencyInjection Component
symfony/event-dispatcher        v3.4.35 Symfony EventDispatcher Component
symfony/filesystem              v3.4.39 Symfony Filesystem Component
symfony/finder                  v4.4.7  Symfony Finder Component
symfony/http-foundation         v3.4.35 Symfony HttpFoundation Component
symfony/http-kernel             v3.4.35 Symfony HttpKernel Component
symfony/polyfill-ctype          v1.12.0 Symfony polyfill for ctype functions
symfony/polyfill-iconv          v1.12.0 Symfony polyfill for the Iconv extension
symfony/polyfill-mbstring       v1.12.0 Symfony polyfill for the Mbstring extension
symfony/polyfill-php56          v1.12.0 Symfony polyfill backporting some PHP 5.6+ features to lower PHP versions
symfony/polyfill-php70          v1.12.0 Symfony polyfill backporting some PHP 7.0+ features to lower PHP versions
symfony/polyfill-php72          v1.15.0 Symfony polyfill backporting some PHP 7.2+ features to lower PHP versions
symfony/polyfill-util           v1.12.0 Symfony utilities for portability of PHP codes
symfony/process                 v3.4.35 Symfony Process Component
symfony/psr-http-message-bridge v1.1.2  PSR HTTP message bridge
symfony/routing                 v3.4.35 Symfony Routing Component
symfony/serializer              v3.4.35 Symfony Serializer Component
symfony/translation             v3.4.35 Symfony Translation Component
symfony/validator               v3.4.35 Symfony Validator Component
symfony/var-dumper              v4.4.7  Symfony mechanism for exploring and dumping PHP variables
symfony/yaml                    v3.4.35 Symfony Yaml Component


All Symfony components except symfony/finder are down to v3.x. Symfony/finder still is on v4.4.7. So we'll have to downgrade this package too, before being able to install Drupal Console. So let's do that:


composer require symfony/filesystem:"~3.0"

composer require symfony/finder:"~3.0"

composer require drupal/console:~1.10 ~prefer-dist --optimize-autoloader

$ drupal --version
Drupal Console version 1.9.4


And there you go with a brand new Drupal Console added to your site.

 I've been running Drupal 8.8.x on the 3.x versions of those Symfony packages for quite a while now and didn't run into any problems so far. Before pushing this site to production you'd really want to remove Drupal Console and upgrade to the 4.x versions again.


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