A working Drupal 7 composer.json build file

gistfile1.txt

{
  "name": "mynamespace/myproject",
  "description": "Composer file example",
  "repositories": [
    {
      "type": "composer",
      "url": "https://packages.drupal.org/7/"
    },
    {
      "type": "package",
      "package": {
        "name": "mynamespace/patches",
        "version": "1.0.0",
        "type": "patches",
        "require": {
          "netresearch/composer-patches-plugin": "~1.0"
        },
        "extra": {
          "patches": {
            "drupal/entityreference": {
              "7.1.x-dev": {
                "dc4196b4e97e11ff24e762d94864132e12daf7be": {
                  "title": "Allow skipping entity access check when rendering field",
                  "url": "https://www.drupal.org/files/issues/entityreference-skip-access-check-1967180-16.patch"
                }
              }
            },
            "drupal/features": {
              "7.2.2":[
                {
                  "title": "Remove mtime from .info export (added by Drupal 7.33)",
                  "url": "https://www.drupal.org/files/issues/2381739-features-mtime.patch"
                }
              ]
            },
            "drupal/panels_bootstrap_styles": {
              "7.1.0-alpha1":[
                {
                  "title": "Bootstrap Panel Title uses div insteaad of h3 element - semantic issue",
                  "url": "https://www.drupal.org/files/issues/2228445-comment3-h3-panel-title.patch"
                }
              ]
            }
          }
        }
      }
    },
    {
      "type": "package",
      "package": {
        "name": "library/backbone",
        "version": "1.0.0",
        "type": "drupal-library",
        "dist": {
          "url": "https://github.com/jashkenas/backbone/archive/1.0.0.zip",
          "type": "zip"
        }
      }
    },
    {
      "type": "package",
      "package": {
        "name": "library/underscore",
        "version": "1.5.2",
        "type": "drupal-library",
        "dist": {
          "url": "https://github.com/jashkenas/underscore/archive/1.5.2.zip",
          "type": "zip"
        }
      }
    },
    {
      "type": "package",
      "package": {
        "name": "drupal/clean_markup",
        "version": "7.2.7",
        "type": "drupal-module",
        "dist": {
          "url": "http://ftp.drupal.org/files/projects/clean_markup-7.x-2.7.tar.gz",
          "type": "tar"
        }
      }
    },
    {
      "type": "package",
      "package": {
        "name": "drupal/services",
        "version": "7.3.10",
        "type": "drupal-module",
        "dist": {
          "url": "http://ftp.drupal.org/files/projects/services-7.x-3.10.tar.gz",
          "type": "tar"
        }
      }
    },
    {
      "type": "package",
      "package": {
        "name": "drupal/views_datasource",
        "version": "7.1.0-alpha1-dev",
        "type": "drupal-module",
        "source": {
          "url": "http://git.drupal.org/project/views_datasource.git",
          "type": "git",
          "reference": "c15e455cebe36c1a2ef1082da4b0ea7d93db2ed5"
        }
      }
    }
  ],
  "require": {
    "davidbarratt/custom-installer": "dev-master",
    "drupal-composer/preserve-paths": "0.1.*",
    "mynamespace/patches": "*",
    "library/backbone": "1.0.0",
    "library/underscore": "1.5.2",
    "drupal/drupal": "7.34",
    "drupal/addressfield": "1.0-rc1",
    "drupal/admin_menu": "3.0.0-rc4",
    "drupal/auto_entitylabel": "1.2",
    "drupal/autologout": "4.3",
    "drupal/calendar": "3.5",
    "drupal/clean_markup": "2.7",
    "drupal/ckeditor": "1.16",
    "drupal/content_access": "1.2-beta2",
    "drupal/ctools": "1.5",
    "drupal/date": "2.8",
    "drupal/delete_all": "1.1",
    "drupal/devel": "1.5",
    "drupal/diff": "3.2",
    "drupal/draggableviews": "2.0",
    "drupal/ds": "2.7",
    "drupal/email": "1.3",
    "drupal/features": "2.2",
    "drupal/field_group": "1.4",
    "drupal/field_permissions": "1.0-beta2",
    "drupal/file_entity": "2.0-beta1",
    "drupal/flag": "3.5",
    "drupal/hide_formats": "1.1",
    "drupal/image_url_formatter": "1.4",
    "drupal/job_scheduler": "2.0-alpha3",
    "drupal/jquery_update": "2.4",
    "drupal/libraries": "2.2",
    "drupal/link": "1.3",
    "drupal/linkit": "3.3",
    "drupal/markup": "1.1-beta1",
    "drupal/media": "2.0-alpha4",
    "drupal/message": "1.9",
    "drupal/migrate": "2.5",
    "drupal/module_filter": "2.0-alpha2",
    "drupal/panelizer": "3.1",
    "drupal/panels": "3.4",
    "drupal/pathauto": "1.2",
    "drupal/phone": "1.0-beta1",
    "drupal/publish_button": "1.0",
    "drupal/redirect": "1.0-rc1",
    "drupal/rules": "2.7",
    "drupal/search_autocomplete": "4.0.0",
    "drupal/select_or_other": "2.20",
    "drupal/session_limit": "2.0.0",
    "drupal/services": "3.10",
    "drupal/strongarm": "2.0.0",
    "drupal/table_element": "1.0-beta1",
    "drupal/telephone": "1.0-alpha1",
    "drupal/token": "1.5",
    "drupal/transliteration": "3.2",
    "drupal/view_unpublished": "1.1",
    "drupal/views": "3.8",
    "drupal/views_bulk_operations": "3.2",
    "drush/drush": "^7"
  },
  "require-dev": {
    "drupal/conditional_fields": "3.x-dev#78ecb040828f8b9b38ca6e1c37a69782da8d9f86",
    "drupal/entityreference": "1.x-dev#dc4196b4e97e11ff24e762d94864132e12daf7be",
    "drupal/password_policy": "1.x-dev#1276fb37c81a1d76911e0fe1b597438030021676",
    "drupal/views_datasource": "1.0-alpha1"
  },
  "config": {
    "vendor-dir": "vendor"
  },
  "extra": {
    "custom-installer": {
      "drupal-module": "docroot/sites/all/modules/contrib/{$name}/",
      "drupal-theme": "docroot/sites/all/themes/contrib/{$name}/",
      "drupal-library": "docroot/sites/all/libraries/{$name}/",
      "drupal-drush": "docroot/sites/all/drush/{$name}/",
      "drupal-profile": "docroot/profiles/{$name}/",
      "drupal-core": "docroot/"
    },
    "preserve-paths": [
      "docroot/sites/all/modules/contrib",
      "docroot/sites/all/modules/custom",
      "docroot/sites/all/modules/features",
      "docroot/sites/all/themes/contrib",
      "docroot/sites/all/themes/custom",
      "docroot/sites/all/libraries",
      "docroot/sites/all/drush",
      "docroot/sites/default/settings.php",
      "docroot/sites/default/files"
    ]
  }
}