Release 8.x-2.x

I get the following:
- Installation request for drupal/cmis 1.x-dev -> satisfiable by drupal/cmis[1.x-dev].
- Conclusion: remove guzzlehttp/guzzle 6.3.3
- drupal/cmis 1.x-dev requires dkd/php-cmis ^1.0 -> satisfiable by dkd/php-cmis[1.0.1, 1.0.x-dev, v1.0.0].
- dkd/php-cmis 1.0.1 requires guzzlehttp/guzzle ~5.0 -> satisfiable by guzzlehttp/guzzle[5.0.0, 5.0.1, 5.0.2, 5.0.3, 5.1.0, 5.2.0, 5.3.0, 5.3.1, 5.3.2, 5.3.3, 5.3.x-dev].
- dkd/php-cmis 1.0.x-dev requires guzzlehttp/guzzle ~5.0 -> satisfiable by guzzlehttp/guzzle[5.0.0, 5.0.1, 5.0.2, 5.0.3, 5.1.0, 5.2.0, 5.3.0, 5.3.1, 5.3.2, 5.3.3, 5.3.x-dev].
- dkd/php-cmis v1.0.0 requires guzzlehttp/guzzle ~5.0 -> satisfiable by guzzlehttp/guzzle[5.0.0, 5.0.1, 5.0.2, 5.0.3, 5.1.0, 5.2.0, 5.3.0, 5.3.1, 5.3.2, 5.3.3, 5.3.x-dev].
- Can only install one of: guzzlehttp/guzzle[6.3.3, 5.0.0].
- Can only install one of: guzzlehttp/guzzle[6.3.3, 5.0.1].
- Can only install one of: guzzlehttp/guzzle[6.3.3, 5.0.2].
- Can only install one of: guzzlehttp/guzzle[6.3.3, 5.0.3].
- Can only install one of: guzzlehttp/guzzle[6.3.3, 5.1.0].
- Can only install one of: guzzlehttp/guzzle[6.3.3, 5.2.0].
- Can only install one of: guzzlehttp/guzzle[6.3.3, 5.3.0].
- Can only install one of: guzzlehttp/guzzle[6.3.3, 5.3.1].
- Can only install one of: guzzlehttp/guzzle[6.3.3, 5.3.2].
- Can only install one of: guzzlehttp/guzzle[6.3.3, 5.3.3].
- Can only install one of: guzzlehttp/guzzle[6.3.3, 5.3.x-dev].
- Installation request for guzzlehttp/guzzle (installed at 6.3.3) -> satisfiable by guzzlehttp/guzzle[6.3.3].

Any update on making the 2.x version available?

They must create a new release to get the 2.x-dev version.

Instead you can add a repository to read from git directly:

    "repositories": [
        {
            "type": "composer",
            "url": "https://packages.drupal.org/8"
        },
        {
            "type": "package",
            "package": {
                "name": "drupal/cmis",
                "version": "dev-master",
                "type": "drupal-module",
                "extra": {
                    "installer-name": "cmis"
                },
                "source": {
                    "url": "https://git.drupalcode.org/project/cmis.git",
                    "type": "git",
                    "reference": "6afa16fe54bbd3042f9f56ab1dea6cf55ac47889"
                },
                "require": {
                    "composer/installers": "~1.0"
                }
            }
        }
    ],

And then you can use composer normally:

$ composer require drupal/cmis

Greetings

I found I had to make a slight change to my composer, with drupal 8.8.2 version, note the "cmis" : { with in the repositories segment

    "repositories": {
        "drupal": {
            "type": "composer",
            "url": "https://packages.drupal.org/8"
        },
        "cmis": {
            "type": "package",
            "package": {
                "name": "drupal/cmis",
                "version": "dev-master",
                "type": "drupal-module",
                "extra": {
                    "installer-name": "cmis"
                },
                "source": {
                    "url": "https://git.drupalcode.org/project/cmis.git",
                    "type": "git",
                    "reference": "6afa16fe54bbd3042f9f56ab1dea6cf55ac47889"
                },
                "require": {
                    "composer/installers": "~1.0"
                }
            }
        }
    },

after this change i could run composer require drupal/cmis and i get the correct version. after that cd into the modules/contrib/cmis folder and run composer require dkid/phpcmis to install the php cmis client. after that apply patch from https://www.drupal.org/project/cmis/issues/3059528

and use the the browser binding url https://********/alfresco/api/-default-/public/cmis/versions/1.1/browser in the cmis connection.
this was tested against 6.1.2-ga

Here is a cleaner way to require the 2.x branch (without having to require an exact commit):

  "repositories": [
    {
      "type": "composer",
      "url": "https://packages.drupal.org/8"
    },
    {
      "type": "vcs",
      "url": "https://git.drupalcode.org/project/cmis.git"
    }
  ],

And then:

composer require drupal/cmis dev-8.x-2.x

Hello,

Now that the 8.x-2.x-dev development release exists and is published. Onlycomposer require drupal/cmis:2.x-dev is required.

Regards,