[ci skip] update upgrade documentation for 0.3.18

docs/upgrading.md

@@ -1,73 +1,62 @@
 # Upgrading
 
-Dokku is in active development. You can update the deployment step and the build step separately.
+This document covers upgrades for the 0.3.0 series and up. If upgrading from previous versions, we recommend [a fresh install](http://progrium.viewdocs.io/dokku/installation) on a new server.
 
-**Note**: If you are upgrading from a revision prior to [27d4bc8c3c](https://github.com/progrium/dokku/commit/27d4bc8c3c19fe580ef3e65f2f85b85101cd83e4), follow the instructions in [this wiki entry](https://github.com/progrium/dokku/wiki/Migrating-to-Dokku-0.2.0).
+> As of 0.3.18, dokku is installed by default via a debian package. Source-based installations are still available, though not recommended.
 
-To update the deploy step (this is updated less frequently):
+## Dokku
+
+If dokku was installed via a debian package, you can upgrade dokku via the following command:
+
+```shell
+sudo apt-get install dokku
+```
+
+For unattended upgrades, you may run the following command:
+
+```shell
+sudo apt-get install -qq -y dokku
+```
+
+If you have installed dokku from source, you may run the following commands to upgrade:
 
 ```shell
 cd ~/dokku
 git pull --tags origin master
+
+# continue to install from source
+sudo DOKKU_BRANCH=master make install
+
+# upgrade to debian package-based installation
 sudo make install
 ```
 
-Nothing needs to be restarted. Changes will take effect on the next push / deployment.
-
-To update the build step:
+All changes will take effect upon next application deployment. To trigger a rebuild of every application, simply run the following command:
 
 ```shell
+dokku ps:rebuildall
+```
+
+## Buildstep image
+
+If dokku was installed via a debian package, you can upgrade buildstep via the following command:
+
+```shell
+sudo apt-get install buildstep
+```
+
+For unattended upgrades, you may run the following command:
+
+```shell
+sudo apt-get install -qq -y buildstep
+```
+
+In some cases, it may be desirable to run a specific version of buildstep. To install/upgrade buildstep from source, run the following commands:
+
+```shell
+cd /tmp
 git clone https://github.com/progrium/buildstep.git
 cd buildstep
 git pull origin master
 sudo make build
 ```
-
-This will build a fresh Ubuntu Quantal image, install a number of packages, and
-eventually replace the Docker image for buildstep.
-
-## Migrating from 0.1.0 to 0.2.0
-
-This should be summary of breaking changes between 0.1 and 0.2 version with instructions to upgrade.
-
-### software-properties-common
-
-software-properties-common is now a dependency for plugins. Before running dokku install script, make sure it is installed.
-
-```shell
-> sudo apt-get install software-properties-common
-```
-
-### Gitreceive removed
-
-PR [#270](https://github.com/progrium/dokku/pull/270).
-
-Starting with Dokku 0.2.0, [Gitrecieve](https://github.com/progrium/gitreceive) is replaced by a `git` plugin.
-
-Dokku no longer uses the `git` user. Everything is done with the `dokku` user account.
-
-This causes the remote url to change. Instead of pushing to `git@hostname:app`, you should now push to `dokku@hostname:app`.
-The url must be modified using the `git remote set-url` command :
-
-    git remote set-url deploy dokku@hostname:app
-
-Where `deploy` is the name of the remote.
-
-Additionally, the repositiories on the server must be migrated to work with dokku 0.2.0
-
-There is an upgrade [script](https://gist.github.com/plietar/7201430), which is meant to automate this migration. To use it:
-
-1. run the script as root
-2. `git pull` to get the latest version of dokku
-3. make install
-4. `dokku ps:restartall`
-
-TDB.
-
-### Cache directory
-
-Commit [#6350f373](https://github.com/progrium/dokku/commit/6350f373be2cef4f3bb90912099e1be6196522d1)
-
-Buildstep have to be re-installed in order to support cache directory.
-
-TDB.