Build docker image including version with bitbucket pipelines

Question

I'm pretty new to Bitbucket Pipelines and I encountered a problem. I'm creating a pipeline to deploy a new version of our Spring Boot application (which runs in a Kubernetes cluster) to our test environment. The problem I encountered is the versioning of our docker build. Our versioning is set up as the following:

alpha_0.1
alpha_0.2
beta_1.0
gamma_1.0
gamma_1.1

So every minor update/bugfix increases the build number by 0.1, and a major update increases the version by 1.0 + every major update gets a new version name.

Currently I have the next setup:

image: java:8

options:
  docker: true

branches:
  master:
    - step:
        caches:
          - gradle
        script:
          - ./gradlew test
          - ./gradlew build
          - docker build -t <application_name>/<version_name>_<version_number>

What is the best way to include the version_name and the version_number in the bitbucket pipeline? Until now we runned ruby script which allowed user input for version numbering, but bitbucket pipelines are not interactive.

Answer 1

Assuming that alpha_0.1 etc. are tags and that the pipeline runs if a commit is tagged, you can get the tag for the current commit like this:

TAG=$(git tag --contains $BITBUCKET_COMMIT)

You can then use your favorite language or command-line tool to create the <version_name> and <version_number> from the tag you got. It may make sense to export the tag as a shell variable to be able to use it in a script.