Dependabot Update Script

This repo contains two scripts that demonstrates Dependabot Core. It is intended to give you a feel for how Dependabot Core works so that you can use it in your own project.

If you're looking for a hosted, feature-rich dependency updater then you probably want Dependabot itself.

Setup and usage

rbenv install # (Install Ruby version from ./.ruby-version)
bundle install

Native helpers

Languages that require native helpers to be installed: Terraform, Python, Go (Dep & Modules), Elixir, PHP, JS

To install the native helpers, export an environment variable that points to the directory into which the helpers should be installed and add the relevant bins to your PATH:

export DEPENDABOT_NATIVE_HELPERS_PATH="$(pwd)/native-helpers"
mkdir -p $DEPENDABOT_NATIVE_HELPERS_PATH/{terraform,python,dep,go_modules,hex,composer,npm_and_yarn}
export PATH="$PATH:$DEPENDABOT_NATIVE_HELPERS_PATH/terraform/bin:$DEPENDABOT_NATIVE_HELPERS_PATH/python/bin:$DEPENDABOT_NATIVE_HELPERS_PATH/go_modules/bin:$DEPENDABOT_NATIVE_HELPERS_PATH/dep/bin"
export MIX_HOME="$DEPENDABOT_NATIVE_HELPERS_PATH/hex/mix"

Copy the relevant helpers from the gem source to the new install location

Language	Command
Terraform	cp -r $(bundle show dependabot-terraform)/helpers $DEPENDABOT_NATIVE_HELPERS_PATH/terraform/helpers
Python	cp -r $(bundle show dependabot-python)/helpers $DEPENDABOT_NATIVE_HELPERS_PATH/python/helpers
Go Dep	cp -r $(bundle show dependabot-dep)/helpers $DEPENDABOT_NATIVE_HELPERS_PATH/dep/helpers
Go Modules	cp -r $(bundle show dependabot-go_modules)/helpers $DEPENDABOT_NATIVE_HELPERS_PATH/go_modules/helpers
Elixir	cp -r $(bundle show dependabot-hex)/helpers $DEPENDABOT_NATIVE_HELPERS_PATH/hex/helpers
PHP	cp -r $(bundle show dependabot-composer)/helpers $DEPENDABOT_NATIVE_HELPERS_PATH/composer/helpers
JS	cp -r $(bundle show dependabot-npm_and_yarn)/helpers $DEPENDABOT_NATIVE_HELPERS_PATH/npm_and_yarn/helpers

Build the helpers you want to use (you'll also need the corresponding language installed)

Language	Command
Terraform	$DEPENDABOT_NATIVE_HELPERS_PATH/terraform/helpers/build $DEPENDABOT_NATIVE_HELPERS_PATH/terraform
Python	$DEPENDABOT_NATIVE_HELPERS_PATH/python/helpers/build $DEPENDABOT_NATIVE_HELPERS_PATH/python
Go Dep	$DEPENDABOT_NATIVE_HELPERS_PATH/dep/helpers/build $DEPENDABOT_NATIVE_HELPERS_PATH/dep
Go Modules	$DEPENDABOT_NATIVE_HELPERS_PATH/go_modules/helpers/build $DEPENDABOT_NATIVE_HELPERS_PATH/go_modules
Elixir	$DEPENDABOT_NATIVE_HELPERS_PATH/hex/helpers/build $DEPENDABOT_NATIVE_HELPERS_PATH/hex
PHP	$DEPENDABOT_NATIVE_HELPERS_PATH/composer/helpers/build $DEPENDABOT_NATIVE_HELPERS_PATH/composer
JS	$DEPENDABOT_NATIVE_HELPERS_PATH/npm_and_yarn/helpers/build $DEPENDABOT_NATIVE_HELPERS_PATH/npm_and_yarn

Environment Variables

The update scripts are configured using environment variables. The available variables are listed in the table below. (See ./generic-update-script.rb for more context.)

Variable Name	Default	Notes
DIRECTORY_PATH	/	Directory where the base dependency files are.
PACKAGE_MANAGER	bundler	Valid values: bundler, cargo, composer, dep, docker, elm, go_modules, gradle, hex, maven, npm_and_yarn, nuget, pip (includes pipenv), submodules, terraform
PROJECT_PATH	N/A (Required)	Path to repository. Usually in the format <namespace>/<project>.
BRANCH	N/A (Optional)	Branch to fetch manifest from and open pull requests against.
PULL_REQUESTS_ASSIGNEE	N/A (Optional)	User to assign to the created pull request.

There are other variables that you must pass to your container that will depend on the Git source you use:

Github

Variable	Default
GITHUB_ACCESS_TOKEN	N/A (Required)

Github Enterprise

Variable	Default
GITHUB_ENTERPRISE_ACCESS_TOKEN	N/A (Required)
GITHUB_ENTERPRISE_HOSTNAME	N/A (Required)

Gitlab

Variable	Default
GITLAB_ACCESS_TOKEN	N/A (Required)
GITLAB_AUTO_MERGE	N/A (Optional)
GITLAB_HOSTNAME	gitlab.com
GITLAB_ASSIGNEE_ID	N/A Deprecated. Use PULL_REQUESTS_ASSIGNEE instead.

Azure DevOps

Variable	Default
AZURE_ACCESS_TOKEN	N/A (Required)
AZURE_HOSTNAME	dev.azure.com

Also note that the PROJECT_PATH variable should be in the format: organization/project/_git/package-name.

Bitbucket

Variable	Default
BITBUCKET_ACCESS_TOKEN	N/A (Required*)
BITBUCKET_APP_USERNAME	N/A (Required*)
BITBUCKET_APP_PASSWORD	N/A (Required*)
BITBUCKET_API_URL	https://api.bitbucket.org/2.0
BITBUCKET_HOSTNAME	bitbucket.org

* Either BITBUCKET_ACCESS_TOKEN must be passed, or BITBUCKET_APP_USERNAME and BITBUCKET_APP_PASSWORD.

Running dependabot

There are a few ways of running the script:

• interactively with ./update-script.rb,
• non-interactively with ./generic-update-script.rb,
• and non-interactively using Docker.

Running update-script.rb (GitHub only)

1. bundle exec irb
2. Edit the variables at the top of the script you're using, or set the corresponding environment variables.
3. Copy and paste the script into the Ruby session to see how Dependabot works.

If you run into any trouble with the above please create an issue!

Running generic-update-script.rb

1. Configure your shell with the correct environment variables.
2. Execute the script with Bundler:

   bundle exec ruby ./generic-update-script.rb

Running script with dependabot-script Dockerfile

If you don't want to setup the machine where the script will be executed, you could run the script within a dependabot/dependabot-script container.

You can build and run the Dockerfile in order to do that. You'll also have to set several environment variables to make the script work with your configuration, as specified above. (You can find how to pass environment variables to your container in Docker run reference.)

Steps:

1. Build the dependabot-script Docker image

git clone https://github.com/dependabot/dependabot-script.git
cd dependabot-script

docker build -t "dependabot/dependabot-script" -f Dockerfile .

2. Run dependabot

docker run --rm \
  --env "PROJECT_PATH=organization/project" \
  --env "PACKAGE_MANAGER=bundler" \
  "dependabot/dependabot-script"

If everything goes well you should be able to see something like:

/home/dependabot/dependabot-script# ./generic-update-script.rb
Fetching gradle dependency files for myorganisation/project
Parsing dependencies information
...

Running scripts with dependabot-core Dockerfile only

The dependabot-core Dockerfile installs dependencies as the dependabot user, so volume mouning won't work unless you build the image by passing in the USER_UID and USER_GID arguments. This creates the dependabot user with the same IDs ensuring it owns the mounted files and can write to them from within the container.

Steps:

1. Build dependabot-core image

git clone https://github.com/dependabot/dependabot-core.git
cd dependabot-core

docker build \
  --build-arg "USER_UID=$(id -u)" \
   --build-arg "USER_GID=$(id -g)" \
  -t "dependabot/dependabot-core" .
cd ..

2. Install dependencies

git clone https://github.com/dependabot/dependabot-script.git
cd dependabot-script

docker run -v "$(pwd):/home/dependabot/dependabot-script" -w /home/dependabot/dependabot-script dependabot/dependabot-core bundle install -j 3 --path vendor

3. Run dependabot

docker run --rm -v "$(pwd):/home/dependabot/dependabot-script" -w /home/dependabot/dependabot-script -e ENV_VARIABLE=value dependabot/dependabot-core bundle exec ruby ./generic-update-script.rb

GitLab CI

The easiest configuration is to have a repository dedicated to the script. Many pipeline schedules can be added on that single repo to manage multiple projects. Thus https://[gitlab.domain/org/dependabot-script-repo]/pipeline_schedules dashboard becomes your own dependabot admin interface.

• Clone or mirror this repository.
• Copy .gitlab-ci.example.yml to .gitlab-ci.yml or set a custom CI config path for direct usage.
• Set the required global variables used in ./generic-update-script.rb.
• Create a pipeline schedule for each managed repository.
• Set in the schedule the required variables:
  • PROJECT_PATH: group/repository
  • PACKAGE_MANAGER_SET: bundler,composer,npm_and_yarn
• If you'd like to specify the directory that contains the manifest file in the repository, you can set the following environment variable:
  • DIRECTORY_PATH: /path/to/point
• If you'd like Merge Requests to be assigned to a user, set the following environment variable:
  • PULL_REQUESTS_ASSIGNEE: Integer ID of the user to assign. This can be found at https://gitlab.com/api/v4/users?username=<your username>

The scripts

• Single dependency update script
• GitLab/GHE update script