Refactor Bitbucket import docs

doc/README.md

@@ -8,7 +8,7 @@
 - [GitLab as OAuth2 authentication service provider](integration/oauth_provider.md). It allows you to login to other applications from GitLab.
 - [Container Registry](user/project/container_registry.md) Learn how to use GitLab Container Registry.
 - [GitLab basics](gitlab-basics/README.md) Find step by step how to start working on your commandline and on GitLab.
-- [Importing to GitLab](workflow/importing/README.md).
+- [Importing to GitLab](workflow/importing/README.md) Import your projects from GitHub, Bitbucket, GitLab.com, FogBugz and SVN into GitLab.
 - [Importing and exporting projects between instances](user/project/settings/import_export.md).
 - [Markdown](user/markdown.md) GitLab's advanced formatting system.
 - [Migrating from SVN](workflow/importing/migrating_from_svn.md) Convert a SVN repository to Git and GitLab.

doc/integration/bitbucket.md

@@ -18,8 +18,10 @@ Bitbucket.org.
 ## Bitbucket OmniAuth provider
 
 > **Note:**
-Make sure to first follow the [Initial OmniAuth configuration][init-oauth]
-before proceeding with setting up the Bitbucket integration.
+GitLab 8.15 significantly simplified the way to integrate Bitbucket.org with
+GitLab. You are encouraged to upgrade your GitLab instance if you haven't done
+already. If you're using GitLab 8.14 and below, [use the previous integration
+docs][bb-old].
 
 To enable the Bitbucket OmniAuth provider you must register your application
 with Bitbucket.org. Bitbucket will generate an application ID and secret key for
@@ -111,16 +113,12 @@ well, the user will be returned to GitLab and will be signed in.
 
 ## Bitbucket project import
 
-You should be able to see the "Import projects from Bitbucket" option on the New Project page
-enabled.
-
-## Acknowledgements
-
-Special thanks to the writer behind the following article:
-
-- http://stratus3d.com/blog/2015/09/06/migrating-from-bitbucket-to-local-gitlab-server/
+Once the above configuration is set up, you can use Bitbucket to sign into
+GitLab and [start importing your projects][bb-import].
 
 [init-oauth]: omniauth.md#initial-omniauth-configuration
+[bb-import]: ../workflow/importing/import_projects_from_bitbucket.md
+[bb-old]: https://gitlab.com/gitlab-org/gitlab-ce/blob/8-14-stable/doc/integration/bitbucket.md
 [bitbucket-docs]: https://confluence.atlassian.com/bitbucket/use-the-ssh-protocol-with-bitbucket-cloud-221449711.html#UsetheSSHprotocolwithBitbucketCloud-KnownhostorBitbucket%27spublickeyfingerprints
 [reconfigure]: ../administration/restart_gitlab.md#omnibus-gitlab-reconfigure
 [restart GitLab]: ../administration/restart_gitlab.md#installations-from-source

doc/workflow/importing/import_projects_from_bitbucket.md

@@ -1,27 +1,63 @@
 # Import your project from Bitbucket to GitLab
 
-It takes just a few steps to import your existing Bitbucket projects to GitLab. But keep in mind that it is possible only if Bitbucket support is enabled on your GitLab instance. You can read more about Bitbucket support [here](../../integration/bitbucket.md).
+Import your projects from Bitbucket to GitLab with minimal effort.
 
-* Sign in to GitLab.com and go to your dashboard
+## Overview
 
-* Click on "New project"
+>**Note:**
+The [Bitbucket integration][bb-import] must be first enabled in order to be
+able to import your projects from Bitbucket. Ask your GitLab administrator
+to enable this if not already.
 
-![New project in GitLab](bitbucket_importer/bitbucket_import_new_project.png)
+- At its current state, the Bitbucket importer can import:
+  - the repository description (GitLab 7.7+)
+  - the Git repository data (GitLab 7.7+)
+  - the issues (GitLab 7.7+)
+  - the pull requests (GitLab 8.4+)
+  - the wiki pages (GitLab 8.4+)
+  - the milestones (GitLab 8.7+)
+  - the labels (GitLab 8.7+)
+  - the release note descriptions (GitLab 8.12+)
+- References to pull requests and issues are preserved (GitLab 8.7+)
+- Repository public access is retained. If a repository is private in Bitbucket
+  it will be created as private in GitLab as well.
 
-* Click on the "Bitbucket" button
-
-![Bitbucket](bitbucket_importer/bitbucket_import_select_bitbucket.png)
-
-* Grant GitLab access to your Bitbucket account
-
-![Grant access](bitbucket_importer/bitbucket_import_grant_access.png)
-
-* Click on the projects that you'd like to import or "Import all projects"
-
-![Import projects](bitbucket_importer/bitbucket_import_select_project.png)
-
-A new GitLab project will be created with your imported data. Keep in mind that if you want to Bitbucket users
-to be linked to GitLab user you have to have all of them in GitLab in advance. They will be matched by their BitBucket username.
-
-### Note
 Milestones and wiki pages are not imported from Bitbucket.
+
+## How it works
+
+When issues/pull requests are being imported, the Bitbucket importer tries to find
+the Bitbucket author/assignee in GitLab's database using the Bitbucket ID. For this
+to work, the Bitbucket author/assignee should have signed in beforehand in GitLab
+and [**associated their Bitbucket account**][social sign-in]. If the user is not
+found in GitLab's database, the project creator (most of the times the current
+user that started the import process) is set as the author, but a reference on
+the issue about the original Bitbucket author is kept.
+
+The importer will create any new namespaces (groups) if they don't exist or in
+the case the namespace is taken, the repository will be imported under the user's
+namespace that started the import process.
+
+## Importing your Bitbucket repositories
+
+1. Sign in to GitLab and go to your dashboard.
+1. Click on **New project**.
+
+    ![New project in GitLab](img/bitbucket_import_new_project.png)
+
+1. Click on the "Bitbucket" button
+
+    ![Bitbucket](img/import_projects_from_github_new_project_page.png)
+
+1. Grant GitLab access to your Bitbucket account
+
+    ![Grant access](img/bitbucket_import_grant_access.png)
+
+1. Click on the projects that you'd like to import or **Import all projects**.
+   You can also select the namespace under which each project will be
+   imported.
+
+    ![Import projects](img/bitbucket_import_select_project.png)
+
+[bb-import]: ../../integration/bitbucket.md
+[social sign-in]: ../../user/profile/account/social_sign_in.md