Cancelot

Provides automation for cancelling Google Cloud Builds.

Cancels previously queued builds in the same workflow when new build is submitted.

For example, allows you to cancel builds running for the branch on new commits to this branch.

Aimed to replace cancelot because of issues with it.

Use as a first step to cancel previous builds currently in progress.

Use --same_trigger_only to narrow down to builds triggered by the same trigger id.

Usage (Google Cloud Build)

ℹ️ Tip: Use suitable regional registry to reduce cross-region traffic costs.

For example, eu.gcr.io/google.com/cloudsdktool/google-cloud-cli:alpine for europe-* regions.

Sample trigger config .cloudbuild/pull-request-trigger.yml:

name: pull-request
description: Do some work on each PR
filename: .cloudbuild/pull-request-action.yaml
github:
  name: cancelot
  owner: siberex
  pullRequest:
    branch: ^main$

Sample action config, .cloudbuild/pull-request-action.yaml:

steps:
- id: cancelot
  name: 'gcr.io/google.com/cloudsdktool/google-cloud-cli:alpine'
  entrypoint: bash
  args:
    # To download the latest version (if you trust running random bash scripts from the internets!):
    #- curl -L https://gist.github.com/siberex/bb0540b208019382d08732cc6dd59007/raw -o cancelot.sh && chmod +x cancelot.sh
    - cancelot.sh 
    -  --current_build_id "${BUILD_ID}"
    -  --branch_name "${BRANCH_NAME}"
    -  --same_trigger_only
  env:
    - 'PROJECT_ID=$PROJECT_ID'
    - 'LOCATION=$LOCATION'
- id: do-some-work
  waitFor: ['cancelot']
  name: alpine
  entrypoint: /bin/sh
  args:
    - -c
    - |
      sleep 5s
      echo JOB DONE!

Both CLI ARGS and ENV variables are accepted and are interchangeable:

--current_build_id $BUILD_ID could be replaced with CURRENT_BUILD_ID=$BUILD_ID env.

PROJECT_ID=$PROJECT_ID could be replaced with --project $PROJECT_ID arg.

Arguments took precedence over ENV.

Usage (Other CI)

Script could be used locally or with any CI environment with gcloud installed and authenticated (gcloud auth login).

./cancelot.sh --current_build_id $BUILD_ID --branch_name $BRANCH_NAME [--same_trigger_only] [--project "gcloud-project-id"] [--region "europe-west2"]

You can download the latest version from gist, btw, without cloning the repo (if you trust running random bash scripts from the internets!):

curl -L https://gist.github.com/siberex/bb0540b208019382d08732cc6dd59007/raw -o cancelot.sh && chmod +x cancelot.sh

Run locally with docker and pass gcloud auth config from the host via volume mapping:

docker run -it --rm -e CLOUDSDK_CONFIG=/config/gcloud \
  -v "$HOME/.config/gcloud":/config/gcloud \
  -v "$PWD/cancelot.sh":/cancelot.sh \
  --entrypoint bash \
  gcr.io/google.com/cloudsdktool/google-cloud-cli:alpine \
  cancelot.sh --current_build_id abcdef12-3456-7890-a1b2-c3d4e5f6dead

gcloud SDK official images – gcr.io/google.com/cloudsdktool/google-cloud-cli:alpine

Cloud Builder gcloud image – gcr.io/cloud-builders/gcloud-slim:latest