Make the docker-compose env work as a dev environment

* Mount the app directory into the container
* Setup the env files on start
* Seed if the sqllite db file is missing

docker-compose.yml

@@ -4,8 +4,9 @@ services:
     image: zendesk/samson:latest
     ports:
       - "3000:9080"
+    volumes:
+      - .:/app/
     environment:
-      DATABASE_URL: "sqlite3://db/development.sqlite"
+      DATABASE_URL: "sqlite3:///app/db/development.sqlite3"
       RAILS_LOG_TO_STDOUT: 1
-    # to use .env.virtualbox with 192.168.42.45 host prefix ./bin/decode_dot_env .env.virtualbox && source <(sed -E -n 's/[^#]+/export &/ p' .env.virtualbox) &&
-    command: ["bash", "-c", "rake db:setup && bundle exec puma -C config/puma.rb"]
+    command: ["./script/docker_dev_server"]

docs/setup.md

@@ -7,6 +7,7 @@ docker-compose up
 open http://localhost:3000
 ```
 
+The local project directory will be mounted into the container, so your changes will be reflected immediately by the server.
 When running on virtual the `3000` port forwarding should be configured in virtualbox (Settings -> Network -> Advanced -> Port Forwarding).
 When running on virtual `192.168.42.45` use `.env.virtualbox` from `docker-compose.yml`.
 When running on neither localhost nor `192.168.42.45` create your own credentials and load them from `docker-compose.yml`.
@@ -42,7 +43,7 @@ Set up a production block in database.yml with the settings to connect to your D
 
 ## Webserver
 
-Configure `config/puma.rb` as you need. See [puma's documentation](https://github.com/puma/puma/) for details. 
+Configure `config/puma.rb` as you need. See [puma's documentation](https://github.com/puma/puma/) for details.
 You can start the server using this file by doing `bundle exec puma -C config/puma.rb`.
 To restart the server use `kill -USR1 <pid>` which makes it restart without losing any downtime (lost requests).
 

script/docker_dev_server

@@ -0,0 +1,17 @@
+#!/bin/bash -e
+
+bundle install --local --quiet --jobs 4 || bundle check
+
+if [ ! -f .env ]; then
+    cp .env.bootstrap .env
+    # to use .env.virtualbox with 192.168.42.45 host prefix ./bin/decode_dot_env .env.virtualbox && source <(sed -E -n 's/[^#]+/export &/ p' .env.virtualbox) &&
+    ./bin/decode_dot_env .env
+fi
+
+if [ -f db/development.sqlite3 ]; then
+    bundle exec rake db:migrate
+else
+    bundle exec rake db:setup
+fi
+
+exec bundle exec puma -C config/puma.rb