Parameterize Dockerfiles for Open edX releases

docker/README.md

@@ -37,6 +37,35 @@ make docker.pkg.<service>    # Package <service> for publishing to Dockerhub. Th
 make docker.push.<service>   # Push <service> to Dockerhub as latest.
 ```
 
+
+## Image naming
+
+Images built from master branches are named `edxops/<service>`, for example,
+`edxops/edxapp`.  Images built from Open edX release branches include the
+short release name: `edxops/ficus/edxapp`.  Both images will have a `:latest`
+version.
+
+
+## Build arguments
+
+Dockerfiles make use of these build arguments:
+
+* `OPENEDX_RELEASE` is the release branch to use.  It defaults to "master".
+  To use an Open edX release, provide the full branch name:
+
+  ```
+  --build-arg OPENEDX_RELEASE=open-release/ficus.master
+  ```
+
+* `IMAGE_PREFIX` is the release branch component to add to images.  It defaults
+  to an empty string for master builds.  For Open edX release, use the short
+  name of the release, with a trailing slash:
+
+  ```
+  --build-arg IMAGE_PREFIX=ficus/
+  ```
+
+
 ## Conventions
 
 In order to facilitate development, Dockerfiles should be based on

docker/build/edxapp/Dockerfile

@@ -8,7 +8,8 @@
 # with the currently checked-out configuration repo.
 
 
-FROM edxops/xenial-common:latest
+ARG IMAGE_PREFIX
+FROM edxops/${IMAGE_PREFIX}xenial-common:latest
 MAINTAINER edxops
 USER root
 CMD ["/edx/app/supervisor/venvs/supervisor/bin/supervisord", "-n", "--configuration", "/edx/app/supervisor/supervisord.conf"]
@@ -18,9 +19,12 @@ WORKDIR /edx/app/edx_ansible/edx_ansible/docker/plays
 
 COPY docker/build/edxapp/ansible_overrides.yml /
 
+ARG OPENEDX_RELEASE=master
+ENV OPENEDX_RELEASE=${OPENEDX_RELEASE}
 RUN sudo /edx/app/edx_ansible/venvs/edx_ansible/bin/ansible-playbook edxapp.yml \
     -c local -i '127.0.0.1,' \
     -t 'install,assets,devstack' \
+    --extra-vars=edx_platform_version=${OPENEDX_RELEASE} \
     --extra-vars="@/ansible_overrides.yml"
 
 EXPOSE 18000 18010

docker/build/edxapp/ansible_overrides.yml

@@ -8,7 +8,6 @@ EDXAPP_MONGO_HOSTS:
 devstack: true
 migrate_db: false
 mongo_enable_journal: false
-edx_platform_version: 'master'
 edxapp_npm_production: "no"
 
 EDXAPP_LMS_GUNICORN_EXTRA_CONF: 'reload = True'

docker/build/xenial-common/Dockerfile

@@ -10,7 +10,8 @@ ENV LANG C.UTF-8
 
 ENV ANSIBLE_REPO="https://github.com/edx/ansible"
 ENV CONFIGURATION_REPO="https://github.com/edx/configuration.git"
-ENV CONFIGURATION_VERSION="master"
+ARG OPENEDX_RELEASE=master
+ENV CONFIGURATION_VERSION="${OPENEDX_RELEASE}"
 
 ADD util/install/ansible-bootstrap.sh /tmp/ansible-bootstrap.sh
 RUN chmod +x /tmp/ansible-bootstrap.sh