How to load environment variables from a dotenv file in Flyway? - flyway

Question

Flyway supports environment variables in config files.
Is there a way to make Flyway load these variables from a file, similarly to what Docker and Node.js with dotenv do?
The content of the .env file is for example:
DB_URL=jdbc:postgresql://localhost:5432/db_name
And flyway.conf:
flyway.url=${DB_URL}

Answer 1

If you are using flyway-maven-plugin, you have 3 ways currently:
Defining flyway properties in POM.xml
eg.
<properties>
<flyway.url>jdbc:h2:mem:public;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE;MODE=MySQL;INIT=CREATE SCHEMA IF NOT EXISTS "public";</flyway.url>
<flyway.user>root</flyway.user>
<flyway.password></flyway.password>
</properties>
Defining your flyway properties in some .env or a .conf file.
mvn -Dflyway.configFiles=src/main/resources/some-env-file.env flyway:migrate
Contents of some-env-file.env:
flyway.url=jdbc:h2:mem:public;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE;MODE=MySQL;INIT=CREATE SCHEMA IF NOT EXISTS "public";
flyway.user=root
flyway.password=
Injecting the environment variables directly during maven goal execution:
mvn -Dflyway.url="jdbc:h2:mem:public;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE;MODE=MySQL;INIT=CREATE SCHEMA IF NOT EXISTS public;" -Dflyway.user=root -Dflyway.password=root flyway:migrate
But if you want to load properties from some file using properties-maven-plugin and make them available as enviroment variables, to be used by your flyway-maven-plugin , then unfortunately that is not working.
Here is the github issue tracking this.