initial idea

.gitattributes

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+* text=auto
+
+# Set line endings to LF, even on Windows. Otherwise, execution within Docker fails.
+# See https://help.github.com/articles/dealing-with-line-endings/
+*.sh text eol=lf
+*.rb text eol=lf
+
+# Exclude files from exporting
+
+.gitattributes export-ignore
+.gitignore     export-ignore

LICENSE.txt

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+MIT License
+
+Copyright (c) 2020 Nils Andresen
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# dependabot-cake-action
+
+A github action for running dependabot on repositories using cake-build.
+
+## Table of Contents
+
+- [Background](#background)
+- [Install](#install)
+- [Usage](#usage)
+- [Limitations](#limitations)
+- [Idea / Attribution](#idea--attribution)
+- [Full Example](#full-example)
+- [Running Locally](#running-locally)
+- [Maintainers](#maintainers)
+- [Contributing](#contributing)
+- [License](#license)
+
+## Background
+
+This action provides the features, as developed for https://github.com/dependabot/dependabot-core/pull/1848 (a PR for https://github.com/dependabot/dependabot-core/issues/733): **To have dependabot check cake-references**.
+
+Currently dependabot does not support this and sadly merging https://github.com/dependabot/dependabot-core/pull/1848 might take some time. In the meantime it is possibe to use the code provided in the PR to do the checking "manually".
+
+This action provides the means to do so.
+
+## Install
+
+Use the action in your workflow yaml by adding a step with `uses: nils-org/dependabot-cake-action@v1`.
+
+## Usage
+
+```yml
+- name: check/update cake references
+  uses: nils-org/dependabot-cake-action@v1
+  with:
+    # Where to look for cake files to check for dependency upgrades.
+    # The directory is relative to the repository's root.
+    # Multiple paths can be provided by splitting them with a new line.
+    # Example:
+    #   directory: |
+    #     /path/to/first/module
+    #     /path/to/second/module
+    # Default: "/"
+    directory: ""
+
+    # Branch to create pull requests against.
+    # By default your repository's default branch is used.
+    target_branch: ""
+
+    # Auth token used to push the changes back to github and create the pull request with.
+    # [Learn more about creating and using encrypted secrets](https://help.github.com/en/actions/automating-your-workflow-with-github-actions/creating-and-using-encrypted-secrets)
+    # default: ${{ github.token }}
+    token: ""
+```
+
+## Limitations
+
+This not a read dependabot, so there so "commands" to give (like `@dependabot rebase` and such). If you need to rebase the PR, you'll have to do that manually.
+
+TODOs:
+*  Check what happens when a PR is not merged and closed. Will it simply be re-created every run?
+* How to "ignore" dependencies? 
+
+## Idea / Attribution
+
+Most of this was shamelessly copied from https://github.com/patrickjahns/dependabot-terraform-action/
+
+## Full Example
+Save the following content in you're repo under `.github/workflows/dependabot-cake.yml`
+```yml
+name: dependabot-cake
+on:
+  workflow_dispatch:
+  schedule:
+    # run everyday at 6
+    - cron:  '0 6 * * *'
+
+jobs:
+  dependabot-cake:
+    runs-on: ubuntu-latest # linux, because this is a docker-action
+    steps:
+      - name: check/update cake dependencies
+        uses: nils-org/dependabot-cake-action@v1
+```
+
+## Running Locally
+It is also possible to run this action locally:
+
+* Clone this repo
+* build the docker image
+
+  `cd src && docker build -t dependabot-cake:latest .`
+* run the container and give the needed environment-vars
+
+  `docker run -e GITHUB_REPOSITORY=nils-a/Cake.7zip -e INPUT_TARGET_BRANCH=develop -e INPUT_TOKEN=your-github-api-token dependabot-cake`
+
+
+## Maintainers
+
+[Nils Andresen @nils-a](https://github.com/nils-a).
+
+## Contributing
+We accept Pull Requests.
+
+Small note: If editing the Readme, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification. 
+
+### Contributors
+
+* Nils Andresen
+
+## License
+
+[MIT License © Nils Andresen][LICENSE.txt]

action.yml

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+name: 'cake-dependabot'
+description: 'Dependency updater for cake build files'
+author: 'nils-a'
+inputs:
+  directory:
+    description: >
+      Where to look for cake files to check for dependency upgrades.
+      The directory is relative to the repository's root.
+      Multiple paths can be provided by splitting them with a new line.
+      Example:
+        directory: |
+          /path/to/first/module
+          /path/to/second/module
+    default: "/"
+    required: false
+  target_branch:
+    description: >
+      Branch to create pull requests against.
+      By default your repository's default branch is used.
+    required: false
+  token:
+    description: >
+      Auth token used to push the changes back to github and create the pull request with.
+      [Learn more about creating and using encrypted secrets](https://help.github.com/en/actions/automating-your-workflow-with-github-actions/creating-and-using-encrypted-secrets)
+    default: ${{ github.token }}
+    required: false
+
+runs:
+  using: 'docker'
+  image: 'docker://nilsa/dependabot-cake'
+branding:
+  icon: 'package'
+  color: 'orange'

src/Dockerfile

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+FROM ruby:2.6.6-slim
+
+LABEL "maintainer"="Nils Andresen <[email protected]>" \
+      "repository"="https://github.com/nils-org/dependabot-cake-action" \
+      "homepage"="https://github.com/nils-org/dependabot-cake-action" \
+      "com.github.actions.name"="dependabot-cake-action" \
+      "com.github.actions.description"="Run dependabot for cake as github action" \
+      "com.github.actions.icon"="check-circle" \
+      "com.github.actions.color"="package"
+
+WORKDIR /usr/src/app
+#ENV DEPENDABOT_NATIVE_HELPERS_PATH="/usr/src/app/native-helpers"
+
+COPY ./app /usr/src/app
+COPY ./run-action.sh /usr/local/bin/run-action.sh
+
+# install needed tools
+RUN apt-get update && \
+    apt-get install -y build-essential git wget
+
+# install rb dependencies
+RUN bundle install
+
+# remove runtime-unnedded tools & cleanup
+RUN apt-get remove -y build-essential && \
+    apt-get autoremove -y && \
+    apt-get clean && \
+    rm -rf /tmp/*
+
+CMD ["run-action.sh"]

src/app/Gemfile

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+# frozen_string_literal: true
+
+ruby "2.6.6"
+source "https://rubygems.org"
+
+gem "dependabot-omnibus", "~> 0.123.0"
+gem 'dependabot-cake', git: 'https://github.com/pharos/dependabot-core', branch: "add-support-for-cake"

src/app/dependabot.rb

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+#!/usr/bin/env ruby
+
+require "dependabot/file_fetchers"
+require "dependabot/file_parsers"
+require "dependabot/update_checkers"
+require "dependabot/file_updaters"
+require "dependabot/pull_request_creator"
+require "dependabot/omnibus"
+
+
+# Utilize the github env variable per default
+repo_name = ENV["GITHUB_REPOSITORY"]
+if !repo_name || repo_name.empty?
+  print "GITHUB_REPOSITORY needs to be set"
+  exit(1)
+end
+
+# Directory where the base dependency files are.
+directory = ENV["INPUT_DIRECTORY"] || "/"
+directory = directory.gsub(/\\n/, "\n")
+if directory&.empty?
+  print "The directory needs to be set"
+  exit(1)
+end
+
+# Define the target branch
+target_branch = ENV["INPUT_TARGET_BRANCH"]
+if target_branch && target_branch.empty?
+  target_branch=nil
+end
+
+# Token to be used for fetching repository files / creating pull requests
+repo_token = ENV["INPUT_TOKEN"]
+if !repo_token || repo_token.empty?
+  print "A github token needs to be provided"
+  exit(1)
+end
+
+credentials_repository = [
+  {
+    "type" => "git_source",
+    "host" => "github.com",
+    "username" => "x-access-token",
+    "password" => repo_token
+  }
+]
+
+def update(source, credentials_repository)
+
+  # Hardcode the package manager to cake
+  package_manager = "cake"
+
+  ##############################
+  # Fetch the dependency files #
+  ##############################
+  fetcher = Dependabot::FileFetchers.for_package_manager(package_manager).new(
+    source: source,
+    credentials: credentials_repository,
+  )
+
+  files = fetcher.files
+  commit = fetcher.commit
+
+  ##############################
+  # Parse the dependency files #
+  ##############################
+  puts "  - Parsing dependencies information"
+  parser = Dependabot::FileParsers.for_package_manager(package_manager).new(
+    dependency_files: files,
+    source: source,
+    credentials: credentials_repository,
+  )
+
+  dependencies = parser.parse
+
+  dependencies.select(&:top_level?).each do |dep|
+    #########################################
+    # Get update details for the dependency #
+    #########################################
+    checker = Dependabot::UpdateCheckers.for_package_manager(package_manager).new(
+      dependency: dep,
+      dependency_files: files,
+      credentials: credentials_repository,
+    )
+
+    next if checker.up_to_date?
+
+    requirements_to_unlock =
+      if !checker.requirements_unlocked_or_can_be?
+        if checker.can_update?(requirements_to_unlock: :none) then :none
+        else :update_not_possible
+        end
+      elsif checker.can_update?(requirements_to_unlock: :own) then :own
+      elsif checker.can_update?(requirements_to_unlock: :all) then :all
+      else :update_not_possible
+      end
+
+    next if requirements_to_unlock == :update_not_possible
+
+    updated_deps = checker.updated_dependencies(
+      requirements_to_unlock: requirements_to_unlock
+    )
+
+    #####################################
+    # Generate updated dependency files #
+    #####################################
+    print "  - Updating #{dep.name} (from #{dep.version})…"
+    updater = Dependabot::FileUpdaters.for_package_manager(package_manager).new(
+      dependencies: updated_deps,
+      dependency_files: files,
+      credentials: credentials_repository,
+    )
+
+    updated_files = updater.updated_dependency_files
+
+    ########################################
+    # Create a pull request for the update #
+    ########################################
+    pr_creator = Dependabot::PullRequestCreator.new(
+      source: source,
+      base_commit: commit,
+      dependencies: updated_deps,
+      files: updated_files,
+      credentials: credentials_repository,
+      label_language: false,
+    )
+    pull_request = pr_creator.create
+    puts "  - submitted"
+
+    next unless pull_request
+
+  end
+end
+
+puts "  - Fetching dependency files for #{repo_name}"
+directory.split("\n").each do |dir|
+  puts "  - Checking #{dir} ..."
+
+  source = Dependabot::Source.new(
+    provider: "github",
+    repo: repo_name,
+    directory: dir.strip,
+    branch: target_branch,
+  )
+  update source, credentials_repository
+end
+
+puts "  - Done"

src/run-action.sh

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+#!/usr/bin/env bash
+set -e
+pushd /usr/src/app > /dev/null
+bundle exec ./dependabot.rb
+popd