Variable substitution in image tag

Hi Kurt!

I’ve created a Scala.js sample application using your plugin: https://gitlab.com/bullbytes/scala-js-example When running the app using docker-compose up, I’d like to use an environment variable to define which tag of the image to use (latest, staging, or production). The default tag should be latest.

Thus, I added this to my docker-compose.yml, using Docker’s variable substitution with default values:

image: registry.gitlab.com/bullbytes/scala-js-example:${APP_DOCKER_IMAGE_TAG:-latest}

While this works using docker-compose up, I run into an error when executing dockerComposeUp in SBT:

Error parsing reference: "registry.gitlab.com/bullbytes/scala-js-example:${APP_DOCKER_IMAGE_TAG:-latest}" is not a valid repository/tag: invalid reference format

Here’s my docker-compose.yml.

Thanks!

P.S.: If you have any feedback for my example app (e.g., my build.sbt), I’d be more than glad to hear it. 😊

[kurtkopchik]

@dpfeiffer & @mb720 - I made an update to the plugin that allows it to now handle docker-compose environment variables that are defined using the ${VARIABLE:-default} format introduced in version 2.1.

If you do not define the environment variable value in the settings variablesForSubstitution or variablesForSubstitutionTask then the default value will be used.

This change has been published in 1.0.22-SNAPSHOT

resolvers += "Sonatype Snapshots" at "https://oss.sonatype.org/content/repositories/snapshots/"
addSbtPlugin("com.tapad" % "sbt-docker-compose" % "1.0.22-SNAPSHOT")

Let me know if you find any issues with it before I merge it to master. Apologies for the delay.

[kurtkopchik]

@dpfeiffer - Thank you for verifying! The fix for this issue is now included in an official release:

addSbtPlugin("com.tapad" % "sbt-docker-compose" % "1.0.22")