dependabot-core

dependabot-core

多语言自动化依赖更新库

Dependabot-Core是一个开源的依赖更新库,支持Ruby、JavaScript、Python等多种编程语言。它可自动检查依赖最新版本,生成更新后的配置文件,并创建包含变更日志的拉取请求。该项目提供自托管选项,并配有完整的开发文档和调试工具,方便开发者进行定制和扩展。

Dependabot依赖更新自动化开源项目GitHubGithub
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Welcome to the public home of Dependabot :dependabot:.

Table of Contents


What is Dependabot-Core?

Dependabot-Core is the library at the heart of Dependabot security / version updates.

Use it to generate automated pull requests updating dependencies for projects written in Ruby, JavaScript, Python, PHP, Dart, Elixir, Elm, Go, Rust, Java and .NET. It can also update git submodules, Docker files, and Terraform files. Features include:

  • Check for the latest version of a dependency that's resolvable given a project's other dependencies
  • Generate updated manifest and lockfiles for a new dependency version
  • Generate PR descriptions that include the updated dependency's changelogs, release notes, and commits

How to run Dependabot

Most people are familiar with the Dependabot service that runs on GitHub.com and GitHub Enterprise. Enabling that is as simple as checking a dependabot.yml configuration file in to your repository's .github directory.

However, if you want to run a custom version of Dependabot or run it on another platform, you're not left out in the cold. This repo provides the logic necessary for hosting your own standalone Dependabot. It currently supports opening Pull Requests against repositories hosted on GitHub, Github Enterprise, Azure DevOps, GitLab, BitBucket, and AWS CodeCommit.

Dependabot-Core is a library, so you'll need an entrypoint script of some kind. Here are a few examples to help you get started.

Note: If you're looking to run Dependabot locally for development/debugging purposes, see the Development Guide.

Dependabot-Script

The dependabot-script repo provides a collection of example scripts for configuring the Dependabot-Core library. It is intended as a starting point for advanced users to run a self-hosted version of Dependabot within their own projects.

Note: We recently refactored the monolithic docker image used within the Dependabot Core library into one-image-per-ecosystem. Unfortunately, that broke dependabot-scripts, and we haven't had time to update them yet. We are aware of the problem and hope to provide a solution soon.

Dependabot CLI

The Dependabot CLI is a newer tool that may eventually replace dependabot-script for standalone use cases. While it creates dependency diffs, it's currently missing the logic to turn those diffs into actual PRs. Nevertheless, it may be useful for advanced users looking for examples of how to hack on Dependabot.

Dependabot on CI

In an environment such as GitHub where Dependabot is running in a container, if you want to change your build or installation process depending on whether Dependabot is checking, you can determine it by the existence of DEPENDABOT environment variable.

Contributing to Dependabot

Reporting issues and Feature Requests

👋 Want to give us feedback on Dependabot, or contribute to it? That's great - thank you so much!

Reproducible Example

Most bug reports should be accompanied by a link to a public repository that reproduces the problem. Bug reports that cannot be reproduced on a public repo using the CLI tool or dry-run script may be closed as "cannot reproduce".

No "+1" Comments

Our issue tracker is quite active, and as a result there's a good chance someone already filed the same issue. If so, please upvote that issue, because we use 👍 reactions on issues as one signal to gauge the impact of a feature request or bug.

However, please do not leave comments that contribute nothing new to the discussion. For details, see https://github.com/golang/go/wiki/NoPlusOne. This is open source, if you see something you want fixed, we are happy to coach you through contributing a pull request to fix it.

Don't file issues about Security Alerts or Dependency Graph

The issue-tracker is meant solely for issues related to Dependabot's updating logic. Issues about security alerts or Dependency Graph should instead be filed as a Code Security discussion.

A good rule of thumb is that if you have questions about the diff in a PR, it belongs here.

Disclosing Security Issues

If you believe you have found a security vulnerability in Dependabot, please review our security policy for details about disclosing them to the GitHub Bug Bounty program, so we can work to resolve the issue before it is disclosed publicly.

Submitting Pull Requests

Want to contribute to Dependabot? That's great - thank you so much!

Contribution workflow:

  1. Fork the project.
  2. Get the development environment running.
  3. Make your feature addition or bug fix.
  4. Add tests for it. This is important so we don't break it in a future version unintentionally.
  5. Send a pull request. The tests will run on it automatically, so don't worry if you couldn't get them running locally.

Please refer to the CONTRIBUTING guidelines for more information.

New Ecosystems

If you're interested in contributing support for a new ecosystem, please refer to the contributing guidelines for more information.

Development Guide

Getting a Development Environment Running

The first step to debugging a problem or writing a new feature is getting a development environment going. We provide a custom Docker-based developer shell that bakes in all required dependencies. In most cases this is the best way to work with the project.

The developer shell uses volume mounts to incorporate your local changes to Dependabot's source code. This way you can edit locally using your favorite editor and the changes are immediately reflected within the docker container for performing dry-runs or executing tests. Note: See caveat about editing the native package manager helper scripts.

Quickstart

The script to launch the developer shell builds the docker images from scratch if it can't find them locally. This can take a while.

Skip the wait by pulling the pre-built image for the ecosystem you want to work on. The image name uses the YAML ecosystem name to specify the ecosystem. For example, for Go Modules, the YAML name is gomod:

$ docker pull ghcr.io/dependabot/dependabot-updater-gomod

Note: Pre-built images are currently only available for AMD64 / Intel architecture. They will run on ARM, but 2x-3x slower than if you manually build ARM-specific images.

Next, run the developer shell, specifying the desired ecosystem using the top-level directory name of the ecosystem in this project. For example, for Go Modules, the top-level directory is named go_modules:

$ bin/docker-dev-shell go_modules => running docker development shell [dependabot-core-dev] ~ $ cd go_modules && rspec spec # to run tests for a particular package

Building Images from Scratch

Normally the Quickstart is all you need, but occasionally you'll need to rebuild the underlying images.

For example, while we don't yet publish ARM-specific images, if you are working on an ARM-based platform, we recommend manually building the images because the resulting containers run much faster.

The developer shell runs within a Dependabot Development docker image, which is built on top of an ecosystem image.

flowchart LR A["docker-dev-shell script"] --> B("Dependabot Development docker image") B --> C("Dependabot Updater Ecosystem docker image (ecosystem specific)") C --> D("Dependabot Updater Core docker image")

Changes to the docker files for any of these images requires building one or more of the images locally in order to be reflected in the development shell.

The simple but slow way is to delete any existing images and then run bin/docker-dev-shell which automatically builds missing images.

The faster way is to pull all the pre-built images that are dependencies of the image you actually need to build. To (re)build a specific one:

  • The Updater core image:

    $ docker pull ghcr.io/dependabot/dependabot-updater-core # OR $ docker build -f Dockerfile.updater-core . # recommended on ARM
  • The Updater ecosystem image:

    $ docker pull ghcr.io/dependabot/dependabot-updater-gomod # OR $ script/build go_modules # recommended on ARM
  • The development container using the --rebuild flag:

    $ bin/docker-dev-shell go_modules --rebuild

Making Changes to native Package Manager helpers

Several Dependabot packages make use of 'native helpers', small executables in their host language.

Changes to these files are not automatically reflected inside the development container.

Once you have made any edits to the helper files, run the appropriate build script to update the installed version with your changes like so:

$ bin/docker-dev-shell bundler => running docker development shell $ bundler/helpers/v2/build $ bin/dry-run.rb bundler dependabot/demo --dir="/ruby"

To view logs and stdout from the native package manager helpers, see debugging native helpers.

Debugging Problems

The first step to debugging is getting the development environment running.

Within the development environment, you have two options for simulating a dependency update job: You can use the newly-developed CLI tool or the original Dry-run script.

CLI tool

The Dependabot CLI is a newly-developed tool that incorporates the GitHub Credentials Proxy to more realistically simulate what's happening within the Dependabot-at-GitHub service when talking to private registries.

It has a dedicated debugging guide, including support for dropping into the Ruby debugger.

Dry-Run Script

Note: Before running the dry-run script, you'll need to get the development environment running.

You can use the bin/dry-run.rb script to simulate a dependency update job, printing the diff that would be generated to the terminal. It takes two positional arguments: the package manager and the GitHub repo name (including the account):

$ bin/docker-dev-shell go_modules => running docker development shell $ bin/dry-run.rb go_modules rsc/quote => fetching dependency files => parsing dependency files => updating 2 dependencies ...

Helpful options to speed up dry-run testing

The Dry-Run script supports many other options, all of which are documented at the top of the script's source code. For example:

  1. LOCAL_GITHUB_ACCESS_TOKEN="fake-GitHub-PAT" allows specifying a GitHub Personal Access Token (PAT) to avoid rate-limiting.
  2. --dir="path/to/subdir/containing/manifest is required if the manifest file is located in a subdirectory.
  3. --dep="dep-name-that-I-want-to-test" allows specifying a single dep to try to update and all others are ignored.
  4. --cache=files allows caching remote dep files locally for faster re-runs when testing local logic changes.
  5. --updater-options=feature_flag_name allows passing in feature flags.

Here's an example of how to string all these together

LOCAL_GITHUB_ACCESS_TOKEN=github_pat_123_fake_string \ bin/dry-run.rb docker jeffwidman/secrets-store-driver \ --dir "/manifest_staging/charts/secrets-store-provider" \ --cache=files \ --dep="secrets-store" \ --updater-options=kubernetes_updates

Adding debug breakpoints

You can add a debugger statement anywhere in the ruby code, for example:

def latest_resolvable_version debugger latest_version_finder.latest_version end

When you execute the job, the Ruby debugger will open. It should look something like this:

[11, 20] in ~/go_modules/lib/dependabot/go_modules/update_checker.rb 11| module GoModules 12| class UpdateChecker < Dependabot::UpdateCheckers::Base 13| require_relative "update_checker/latest_version_finder" 14| 15| def latest_resolvable_version => 16| debugger 17| latest_version_finder.latest_version 18| end 19| 20| # This is currently used to short-circuit latest_resolvable_version, =>#0 Dependabot::GoModules::UpdateChecker#latest_resolvable_version at ~/go_modules/lib/dependabot/go_modules/update_checker.rb:16 #1 Dependabot::GoModules::UpdateChecker#latest_version at ~/go_modules/lib/dependabot/go_modules/update_checker.rb:24 # and 9 frames (use `bt' command for all frames) (rdbg)

At this prompt, you can run debugger commands to navigate around, or enter methods and variables to see what they contain. Try entering dependency to see what dependency Dependabot is currently working on.

Note While in the debugger, changes made to the source code will not be picked up. You will have to end your debugging session and restart it.

Debugging Native Package Manager Helpers

When you're debugging an issue you often need to peek inside these scripts that run in a separate process.

Print all log statements from native helpers using DEBUG_HELPERS=true:

DEBUG_HELPERS=true bin/dry-run.rb bundler dependabot/demo --dir="/ruby"

Pause execution to debug a single native helper function using DEBUG_FUNCTION=<function name>. The function maps to a native helper function name, for example, one of the functions in bundler/helpers/v2/lib/functions.rb.

When this function is being executed a debugger is inserted, pausing execution of the bin/dry-run.rb script, this leaves the current updates tmp directory in place allowing you to cd into the directory and run the native helper function directly:

DEBUG_FUNCTION=parsed_gemfile bin/dry-run.rb bundler dependabot/demo --dir="/ruby" => fetching dependency files => dumping fetched dependency files: ./dry-run/dependabot/demo/ruby => parsing dependency files $ cd /home/dependabot/dependabot-core/tmp/dependabot_TEMP/ruby && echo "{\"function\":\"parsed_gemfile\",\"args\":{\"gemfile_name\":\"Gemfile\",\"lockfile_name\":\"Gemfile.lock\",\"dir\":\"/home/dependabot/dependabot-core/tmp/dependabot_TEMP/ruby\"}}" | BUNDLER_VERSION=1.17.3 BUNDLE_GEMFILE=/opt/bundler/v1/Gemfile GEM_HOME=/opt/bundler/v1/.bundle bundle exec ruby /opt/bundler/v1/run.rb

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