action.yml

name: SemVer Tag from PR
description: Easily version your commits using PR labels
branding:
  icon: tag
  color: blue
# Note: whenever an input is added/deleted, the runs.steps.env section needs to be updated as well!
inputs:
  trunk:
    description: trunk of the repository
    required: true
    default: main
  label_major:
    description: label override for major changes
    required: true
    default: merge-major
  label_minor:
    description: label override for minor changes
    required: true
    default: merge-minor
  label_patch:
    description: label override for patch changes
    required: true
    default: merge-patch
  label_none:
    description: label override for none changes
    required: true
    default: merge-none
  repo_token:
    description: gh token with permissions contents.write and pull-requests.read
    required: true
  repo_ssh_key:
    description: ssh-key to use for pushing tags, base64 encoded. Only needed when you want to trigger additional actions after the tag push. For detailed explanation see Readme
    required: true
  repo_storage_path_overwrite:
    description: path where the repository is cloned. Defaults to GITHUB_WORKSPACE
    required: false
  should_set_tag:
    description: whether tag should be added to the cloned repo inside gh actions
    required: true
    default: "true"
  should_push_tag:
    description: whether tag should be pushed to the original repo
    required: true
    default: "true"
outputs:
  old-tag:
    description: the old tag before applying the semVer-bump
  new-tag:
    description: the new tag after applying the semVer-bump
# unfortunately I could not find a good way to ensure that the GIT_REF of the action
# always matches the image (e.g. using @v1.1.0 would automatically use v1.1.0 image and so on)
# Things tried:
# - use ${{ github.action_ref }} directly inside runs.image -> context 'github' is not available in this section
# - templating the version using the release action -> unfortunately action cannot push to protected branch
# - runs.image=Dockerfile -> the image will be rebuilt every time the action is being run, which adds roughly a minute in execution time
#
# => while the current solution is far from perfect and requires a bit more care when developing, it saves roughly
#    one minute over the Dockerfile solution, which I find is worth it
runs:
  using: composite
  steps:
    - name: run semver-tag-on-merge action
      shell: bash
      env:
        VERSION: ${{ github.action_ref }}
        WORKSPACE: ${{ github.workspace }}
        INPUT_TRUNK: ${{ inputs.trunk }}
        INPUT_LABEL_MAJOR: ${{ inputs.label_major }}
        INPUT_LABEL_MINOR: ${{ inputs.label_minor }}
        INPUT_LABEL_PATCH: ${{ inputs.label_patch }}
        INPUT_LABEL_NONE: ${{ inputs.label_none }}
        INPUT_REPO_TOKEN: ${{ inputs.repo_token }}
        INPUT_REPO_SSH_KEY: ${{ inputs.repo_ssh_key }}
        INPUT_REPO_STORAGE_PATH_OVERWRITE: ${{ inputs.repo_storage_path_overwrite }}
        INPUT_SHOULD_SET_TAG: ${{ inputs.should_set_tag }}
        INPUT_SHOULD_PUSH_TAG: ${{ inputs.should_push_tag }}
      # we need to base64 encode the SSH_KEY due to https://github.com/moby/moby/issues/12997
      # TODO (hack): for now I could not find a better way than manually creating the known_hosts entry for github.com
      run: |
        mkdir -p /home/runner/work/_temp/_github_home && \
        ssh-keyscan -t ecdsa github.com > /home/runner/work/_temp/_github_home/known_hosts && \
        export SSH_KNOWN_HOSTS="/github/home/known_hosts" && \
        export INPUT_REPO_SSH_KEY=$(echo "$INPUT_REPO_SSH_KEY" | base64 -w 0) && \
        docker run \
        --workdir /github/workspace \
        -v "${WORKSPACE}":"${WORKSPACE}" \
        -v "/var/run/docker.sock":"/var/run/docker.sock" \
        -v "/home/runner/work/_temp/_github_home":"/github/home" \
        -v "/home/runner/work/_temp/_github_workflow":"/github/workflow" \
        -v "/home/runner/work/_temp/_runner_file_commands":"/github/file_commands" \
        --env-file <(env) \
        ghcr.io/simontheleg/semver-tag-from-pr-action:${VERSION}