user host permissions are restricted inside container with django user

{{cookiecutter.repo_name}}/Dockerfile

@@ -25,20 +25,10 @@ RUN \
   npm install -g npm && \
   printf '\n# Node.js\nexport PATH="node_modules/.bin:$PATH"' >> /root/.bashrc
 
-RUN npm install -g grunt grunt-cli
+RUN npm install -g grunt-cli
 
-RUN groupadd -r django && useradd -r -g django django
 ADD . /app
 
-RUN chown -R django /app
-
-ADD ./compose/django/gunicorn.sh /gunicorn.sh
-ADD ./compose/django/entrypoint.sh /entrypoint.sh
-
-RUN chmod +x /entrypoint.sh && chown django /entrypoint.sh
-RUN chmod +x /gunicorn.sh && chown django /gunicorn.sh
-
 WORKDIR /app
-USER django
 
-ENTRYPOINT ["/entrypoint.sh"]
+ENTRYPOINT ["/app/compose/django/entrypoint.sh"]

{{cookiecutter.repo_name}}/compose/django/entrypoint.sh

@@ -16,7 +16,17 @@ export DATABASE_URL=postgres://$POSTGRES_ENV_POSTGRES_USER:$POSTGRES_ENV_POSTGRE
 export CELERY_BROKER_URL=$DJANGO_CACHE_URL
 {% endif %}
 
-npm install
+# create a user, with UID of host user,
-grunt build
+# read more about that trick: http://stackoverflow.com/a/28596874/338581
+TARGET_USER_GID=$(stat -c "%u" /app)
+useradd -m -s /bin/bash -u $TARGET_USER_GID django
 
-exec "$@"
+echo -e "\n------------------------------------------------------------\n"
+su -c "npm install" django
+echo -e "\n------------------------------------------------------------\n"
+su -c "grunt build" django
+echo -e "\n------------------------------------------------------------\n"
+
+# somehow, when $@ is used directly, this doesn't work
+COMMAND=$@
+su -c "$COMMAND" django

{{cookiecutter.repo_name}}/docker-compose.yml

@@ -10,7 +10,7 @@ django:
   links:
     - postgres
     - redis
-  command: /gunicorn.sh
+  command: /app/compose/django/gunicorn.sh
   env_file: .env
 
 nginx: