Core

Why are you modifying PackageStates.php manually??

Ok, then tell me how to manage them otherwise.

Discussed that in person some minutes ago. Will post a guideline for composer dependencies once the workflow becomes clear. For now it means composer still unsupported.

I am very interested in this topic. Is 6.2 supposed to allow the installation of external/packagist composer packages?
I am the creator of cundd_composer. The extensions aim is to provide the possibility to use non-TYPO3 composer packages.
Unfortunately the current TYPO3 6.2 version not only seems to not fully support composer - it even makes installations using cundd_composer crash. My extension relies on the composer.json in the extensions root, which is now read by the package manager. If it detects an external dependency an exception is thrown. In 6.1 and below you could simply navigate to the composer backend module and install the dependencies - now there is no way to install the extension which relies on the external composer package.

Hey Daniel,

I can provide some informations which I found out and made my extension with external dependencies working.

TYPO3 doesn't support Composer at the moment - that means external dependencies won't be resolved. To make a composer project with ext deps working you need to create a new folder called Packages at the same level like typo3conf and fileadmin and copy the vendor folder into this folder. Rename "vendor" to "Libraries", delete the PackageStates.php and restart the installation.

.
 Packages
└── Libraries
    ├── autoload.php
    ├── composer
    └── doctrine
├── fileadmin
├── index.php -> typo3_src/index.php
├── php.php
├── typo3 -> typo3_src/typo3
├── typo3_src -> /Volumes/HDD/Users/sok/Development/TYPO3/CMS/core/master
├── typo3conf
├── typo3temp
└── uploads

Hy Stefano!

Thank you for that information!
This could help, but I'm not sure if I really want to try to write into the root :-S
I think I will change my extension to look for cundd_composer.json instead for composer.json files inside the extensions.

I am disappointed how the next TYPO3 version will handle this. I don't really understand why the composer support is implemented incompletely. Isn't the great thing about composer it's ability to install all kinds of libraries from different sources and soften the borders between PHP projects?

Hy

If someone is interested: I updated my composer extension to work with 6.2 (currently only on Github, not in TER).
As a notice I wrote the following:

Upgrade to TYPO3 6.2

TYPO3 6.2 will parse the extensions composer.json files and retrieve different information from it. TYPO3's new Package Manager also allows the definition of dependencies. Unfortunately these dependencies are limited to real TYPO3 extension. If you want to install an extension, which requires a non-TYPO3 package in composer.json, the Package Manager tries to resolve this dependency in vain and the installation fails.

To work around this issue cundd_composer will look for the file cundd_composer.json instead of composer.json. For legacy reasons cundd_composer will still use composer.json TYPO3 versions below 6.2.

CunddComposer on Github

While you might get some mileage by using the Packages/Libraries structure, it is currently not possible to include PSR-4 namespaced packages - so I've created a bug report for this #57604

Is there something left over?

Will there be a fix for 6.2? This is an annoying bug, which prevents us from installing extensions with composer.json files, which also requires non Typo3-package.

For example:

One extension has this composer.json file:

{
    "name": "acme/foobar",
    "type": "typo3-cms-extension",
    "require": {
        "doctrine/cache": "~1.4",

        "composer/installers": "~1.0" 
    }
}

The composer/installers enables me to require the extension in my project roots composer.json and it gets installed into typo3conf/ext/foobar correctly. But I can't enable it, because the EM is complaining about doctrine/cache. But the extension needs this require, so the project roots composer.json gets not clutterd with. So this would be enough in the project root:

{
    "name": "acme/project",
    "require": {
        "acme/foobar": "~1.0" 
    }
}

This is a serious blocker to require extensions in the project via composer.

Fully agree with Patrik.

Why are the TYPO3 6.2 Release Notes claiming something like "Introducing the concept of Package Management brings interoperability with the whole world of Composer based PHP libraries." and "It is now possible to natively load Composer based libraries." if is just not true and hardly restricted?

Unfortunately Tilo is right. In my opinion TYPO3 has no composer support. Or even worse: it would be better to have no composer integration than the current one.
Does anybody know how things are with version 7?

Anyway I love many parts of TYPO3!

If typo3 doesn't support composer it would be no problem, because we use it out of scope of the EM and only activate the composer installed extensions in the EM. The problem is how the EM wanna handle the composer.json of the extensions as addition to the depends contraint in the ext_emconf.php. There it got stuck if your extension relies on non typo3 stuff... :(

Sorry, to reopen this but I needed at least a patch for this in order to get it into my TYPO3 installation. If you need this too, you can add the patch via your composer.json:

{
    "name": "vendor/project",
    "description" : "My TYPO3 project",
    "config": {
        "vendor-dir": "Packages/Libraries" 
    },
    "require": {
        "typo3/cms": "6.2.12",
        "vendor/typo3-cms-patches": "*" 
    },
    "repositories": [
        { "type": "composer", "url": "http://composer.typo3.org/" }
        {
            "type": "package",
            "package": {
                "name": "vendor/typo3-cms-patches",
                "version": "0.0.1",
                "type": "patches",
                "require": {
                    "netresearch/composer-patches-plugin": "~1.0" 
                },
                "extra": {
                    "patches": {
                        "typo3/cms": {
                            "6.2.12": {
                                "9fe856ac96e6a53fef8277f36a4a80bace6f0ae9": {
                                    "title": "[BUGFIX] Ignore dependencies on non typo3-cms-extension",
                                    "url": "https://git.typo3.org/Packages/TYPO3.CMS.git/patch/9fe856ac96e6a53fef8277f36a4a80bace6f0ae9" 
                                }
                            }
                        }
                    }
                }
            }
        }
    ]
}

If you want, you can close the issue again.