Add before-start-server script execution

[luiscoms]

It should fix #147

In your Dockerfile just add your script

COPY before-start-server.sh /usr/local/bin/

[tianon]

Have you looked at using #142 for what you need?

[luiscoms]

No, in my case, I install cron inside container and I need to start it before start server

[tianon]

I'd really recommend trying to run crond in a separate container (using --volumes-from or similar to share the WordPress volume), but you should be able to accomplish what you're trying to do already via a command which fires up crond in the background before running this image-provided entrypoint script.

[luiscoms]

It could be a good approach, but this MR is useful yet

[yosifkit]

Basically the same response as docker-library/mongo#298 (comment); just swap MongoDB related items to Apache/PHP and WordPress appropriate paths, files, or actions:

This is unnecessary since you can already hook a script to run before the entrypoint by running it before the entrypoint:

COPY my-setup-script.sh /docker-entrypoint-extras.d/my-setup-script.sh
# could also just be CMD if you want to put your mongod args into the file
ENTRYPOINT ["/docker-entrypoint-extras.d/my-setup-script.sh"]
CMD ["docker-entrypoint.sh", "--keyFile", "/path/to/keyfile"]

Contents of my-setup-script.sh:

#!/usr/bin/env bash

# pre-mongod setup 
chmod 400 /path/to/keyfile

# ie: docker-entrypoint.sh --keyFile /path/to/keyfile
exec "$@"

From related issue docker-library/mysql#312 (ie, running cron in same container as X).

Be warned that if cron ever crashes there would be nothing in the container that would restart it. It would be better to use a second container that just runs cron, or the host cron that does a docker exec, or add a process supervisor like supervisord.

Other related issues: docker-library/php#248, docker-library/php#301, docker-library/php#409, docker-library/owncloud#49