data_import: Document Rocket.Chat import tool.

templates/zerver/create_realm.html

@@ -34,8 +34,8 @@
             {% endif %}
             <div class="bottom-text">
                 Or import
-                from <a href="/help/import-from-slack">Slack</a>, <a href="/help/import-from-mattermost">Mattermost</a>
+                from <a href="/help/import-from-slack">Slack</a>, <a href="/help/import-from-mattermost">Mattermost</a>,
-                or <a href="/help/import-from-gitter">Gitter</a>.
+                <a href="/help/import-from-gitter">Gitter</a>, or <a href="/help/import-from-rocketchat">Rocket.Chat</a>.
             </div>
         </div>
     </div>

templates/zerver/features.html

@@ -251,7 +251,7 @@
         <a class="feature-block" href="/help/import-from-slack" target="_blank" rel="noopener noreferrer">
             <h3>DATA IMPORT</h3>
             <p>
-                Import an existing Slack, Mattermost or Gitter workspace into Zulip.
+                Import an existing Slack, Mattermost, Gitter or Rocket.Chat workspace into Zulip.
             </p>
         </a>
         <a class="feature-block" href="/help/add-custom-profile-fields" target="_blank" rel="noopener noreferrer">

templates/zerver/for-research.html

@@ -333,7 +333,7 @@
                             <a href="/for/events/">conferences</a>.
                         </div>
                     </li>
-                    <li><div class="list-content">Getting started or moving from another platform is easy! Import your existing organization from <a href="/help/import-from-slack">Slack</a>, <a href="/help/import-from-mattermost">Mattermost</a>, or <a href="/help/import-from-gitter">Gitter</a>.</div></li>
+                    <li><div class="list-content">Getting started or moving from another platform is easy! Import your existing organization from <a href="/help/import-from-slack">Slack</a>, <a href="/help/import-from-mattermost">Mattermost</a>, <a href="/help/import-from-gitter">Gitter</a>, or <a href="/help/import-from-rocketchat">Rocket.Chat</a>.</div></li>
                     <li><div class="list-content">Fully <a href="/help/stream-notifications">customizable notifications</a> let participants keep an eye on the discussions they care about.</div></li>
                     <li><div class="list-content">If you have any questions, please contact us at <a href="mailto:sales@zulip.com">sales@zulip.com</a>. You can also drop by our <a href="/developer-community/">friendly developer community at chat.zulip.org</a> to ask for help or suggest improvements!</div></li>
                 </ul>

templates/zerver/for/communities.md

@@ -127,8 +127,9 @@ improvements into Zulip.
 
 Many communities that migrated from
 [Slack](/help/import-from-slack),
-[Mattermost](/help/import-from-mattermost), or
+[Mattermost](/help/import-from-mattermost),
-[Gitter](/help/import-from-gitter) to Zulip tell us
+[Gitter](/help/import-from-gitter), or
+[Rocket.Chat](/help/import-from-rocketchat) to Zulip tell us
 that Zulip helped them manage and grow an inclusive, healthy
 community. We hope Zulip can help your community succeed too!
 

templates/zerver/for/open-source.md

@@ -120,11 +120,12 @@ account](/help/configure-authentication-methods), instead of with a
 username and password.
 [github-auth]: https://github.com/zulip/zulip/blob/7e9926233/zproject/prod_settings_template.py#L112
 
-### Import from Slack, Mattermost, or Gitter.
+### Import from Slack, Mattermost, Gitter, or Rocket.Chat.
 
 Import your existing organization from [Slack](/help/import-from-slack),
-[Mattermost](/help/import-from-mattermost), or
+[Mattermost](/help/import-from-mattermost),
-[Gitter](/help/import-from-gitter).
+[Gitter](/help/import-from-gitter), or
+[Rocket.Chat](/help/import-from-rocketchat).
 
 ### Collaborate on code and formulas
 

templates/zerver/help/import-from-rocketchat.md

@@ -0,0 +1,101 @@
+# Import from Rocket.Chat
+
+Starting with Zulip 5.0, Zulip supports importing data from Rocket.Chat,
+including users, teams, channels, discussions, messages, and more.
+
+**Note:** You can only import a Rocket.Chat workspace as a new Zulip
+organization. In particular, you cannot use this tool to import data
+into an existing Zulip organization.
+
+## Import from Rocket.Chat
+
+First, you need to export your data from Rocket.Chat. Rocket.Chat does
+not provide an official data export feature, so the Zulip import tool
+works by importing data from a Rocket.Chat database dump.
+
+If you're self-hosting your Rocket.Chat instance, you can create a
+database dump using the `mongodump` utility.
+
+If your organization is hosted on Rocket.Chat Cloud or another hosting
+provider that doesn't provide you with database access, you will need
+to request a database dump by contacting their support.
+
+In either case, you should end up with a directory containing many
+`.bson` files.
+
+### Import into Zulip Cloud
+
+Email support@zulip.com with your database dump and your desired
+Zulip subdomain. Your imported organization will be hosted at
+`<subdomain>.zulipchat.com`.
+
+If you've already created a test organization at
+`<subdomain>.zulipchat.com`, let us know, and we can rename the old
+organization first.
+
+### Import into a self-hosted Zulip server
+
+First [install a new Zulip
+server](https://zulip.readthedocs.io/en/stable/production/install.html)
+with Zulip 5.0 or newer, skipping "Step 3: Create a Zulip
+organization, and log in" (you'll create your Zulip organization via
+the data import tool instead).
+
+Now, get the directory containing all the `bson` files in your database
+dump and save it inside `/home/zulip/rocketchat` on your Zulip server and rename it
+to `rocketchat` (the directory at `/home/zulip/rocketchat` should contain
+all the `bson` files).
+
+Log in to a shell on your Zulip server as the `zulip` user. To import with
+the most common configuration, run the following commands:
+
+```
+cd /home/zulip/deployments/current
+./scripts/stop-server
+./manage.py convert_rocketchat_data /home/zulip/rocketchat --output /home/zulip/converted_rocketchat_data
+./manage.py import "" /home/zulip/converted_rocketchat_data
+./scripts/start-server
+```
+
+This could take a few seconds to several minutes to run, depending on how
+much data you're importing. The server stop/restart is only necessary
+when importing on a server with minimal RAM, where an OOM kill might
+otherwise occur.
+
+**Import options**
+
+The commands above create an imported organization on the root domain
+(`EXTERNAL_HOST`) of the Zulip installation. You can also import into a
+custom subdomain, e.g. if you already have an existing organization on the
+root domain. Replace the last line above with the following, after replacing
+`<subdomain>` with the desired subdomain.
+
+```
+./manage.py import <subdomain> /home/zulip/converted_rocketchat_data
+```
+
+{!import-login.md!}
+
+[upgrade-zulip-from-git]: https://zulip.readthedocs.io/en/latest/production/upgrade-or-modify.html#upgrading-from-a-git-repository
+
+## Caveats
+
+This import tool is currently beta and does not support importing
+the following data:
+
+-   Custom emoji
+-   User avatars
+-   Uploaded files
+-   Default channels for new users
+-   Wildcard mentions such as `@all` and `@here` are not converted.
+-   Starred messages
+-   Threads as separate topics
+-   Messages longer than Zulip's limit of 10,000 characters.
+
+Additionally, because Rocket.Chat does not provide a stable data
+export API, the import tool may require small changes from time to
+time to account for changes in the Rocket.Chat database format.
+Please [contact us](/help/contact-support) if you counter any problems
+using this tool.
+
+[upgrade-zulip-from-git]: https://zulip.readthedocs.io/en/latest/production/upgrade-or-modify.html#upgrading-from-a-git-repository

templates/zerver/help/include/sidebar_index.md

@@ -116,6 +116,7 @@
 * [Import from Mattermost](/help/import-from-mattermost)
 * [Import from Slack](/help/import-from-slack)
 * [Import from Gitter](/help/import-from-gitter)
+* [Import from Rocket.Chat](/help/import-from-rocketchat)
 * [Roles and permissions](/help/roles-and-permissions)
 * [Set the default language for new users](/help/change-the-default-language-for-your-organization)
 * [Export your organization](/help/export-your-organization)

tools/linter_lib/custom_check.py

@@ -880,6 +880,7 @@ help_markdown_rules = RuleList(
             "pattern": "[a-z][.][A-Z]",
             "description": "Likely missing space after end of sentence",
             "include_only": {"templates/zerver/help/"},
+            "exclude_pattern": "Rocket.Chat",
         },
         {
             "pattern": r"\b[rR]ealm[s]?\b",