Make Docker runs friendlier to the contents of the host filesystem, particularly for Linux users.

.gitignore

@@ -37,6 +37,7 @@ tags
 vagrantconfig_local.yaml
 vagrant/manifests/classes/custom.pp
 node_modules
+.npm/
 commonplace_projects
 media/fireplace
 media/rocketfuel

docker-compose.yml

@@ -1,6 +1,7 @@
 web:
   build: .
   command: python manage.py runserver 0.0.0.0:8000
+  entrypoint: ./scripts/start-docker.sh
   ports:
     - "8000:8000"
   volumes:
@@ -17,6 +18,7 @@ web:
     - REDIS_LOCATION=redis:6379
     - MYSQL_ROOT_PASSWORD='docker'
     - MYSQL_DATABASE='olympia'
+    - PYTHONDONTWRITEBYTECODE=1
 
 memcached:
   image: memcached

scripts/start-docker.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+# The current directory is a mounted volume, and is owned by the
+# user running Docker on the host machine.
+#
+# We don't want to trample all over the contents of this directory
+# with files owned by root. So create a new user with the same UID,
+# and drop privileges before running any commands.
+
+# Get the numeric user ID of the current directory.
+uid=$(ls -nd . | awk '{ print $3 }')
+
+# Create an `olympia` user with that ID, and the current directory
+# as its home directory.
+useradd -Md $(pwd) -u $uid olympia
+
+# Switch to that user and execute our actual command.
+exec su olympia -c 'exec "$@"' sh "$@"