Dynamic configuration is a difficult endavour with rocket. You can either hard-code all your values in your Rocket.toml or override certain values with ROCKET_{PARAM} (see guide). However both of these options can be quite cumbersome. What this script allows you is to define variables in your Rocket.toml which are replaced when the application is started.
The variables are replaced by prefix: This script basically takes all your environment variables that start with ROCKET_REPLACE and tries to replace them in your rocket file. If after this operation any ROCKET_REPLACE variables are left in your Rocket.toml, the script exits with an error.
Rocket.toml:
[global.databases]
my-db-db = "ROCKET_REPLACE_DB_PW"Launch app:
$ ROCKET_REPLACE_DB_PW="my-secret-pw" ./launch-rocket.sh --app my-rocket-appThis sript is made for use in Docker. Add these lines to your Dockerfile:
RUN curl -o /launch-rocket.sh https://raw.githubusercontent.com/rethab/rocket-launcher/master/launch-rocket.sh
CMD /launch-rocket.sh --app my-rocket-app--no-replacestart app without replacing any variables--insecureprints database (and other) credentials during startup
This script transparently works with heroku by taking the $PORT variable (which is set by heroku) and setting its value to $ROCKET_PORT (which is the one used by rocket). When deploying to heroku, don't forget to also define $ROCKET_ENV, because otherwise rocket binds to localhost which won't work.
Contributions are very welcome. When making a pull request, please make sure the script passes all checks from shellcheck.