Composer doesn't find local vcs dependency

问题

I have a project that depends on a local package which in itself depends on another local pakcage.

Project

{
...
  "repositories": [
    {
      "packagist": false
    },
    {
      "type": "vcs",
      "url": "/path/to/local/package1"
    },
  ],  
  "require": {
    "local/package1": "dev-master"
  }
...
}

Package 1

{
...
  "repositories": [
    {
      "packagist": false
    },
    {
      "type": "vcs",
      "url": "/path/to/local/package2"
    },
  ],  
  "require": {
    "local/package2": "dev-master"
  }
...
}

When I do a composer install on package1, everything works as expected, packages2 is found and is installed. But when I do it on project it cannot find package2 with this error:

 Problem 1
    - Installation request for local/package1 dev-master -> satisfiable by local/package1[dev-master].
    - local/package1 dev-master requires local/package2 dev-master -> no matching package found.

回答1:

From Composer manual:

Repositories are only available to the root package and the repositories defined in your dependencies will not be loaded. Read the FAQ entry if you want to learn why.

来源：https://stackoverflow.com/questions/29270219/composer-doesnt-find-local-vcs-dependency