Contexts

About contexts

Contexts are a way to access information about workflow runs, runner environments, jobs, and steps. Contexts use the expression syntax. For more information, see "Expressions."

${{ <context> }}

Context name	Type	Description
github	object	Information about the workflow run. For more information, see github context.
env	object	Contains environment variables set in a workflow, job, or step. For more information, see env context.
job	object	Information about the currently executing job. For more information, see job context.
steps	object	Information about the steps that have been run in this job. For more information, see steps context.
runner	object	Information about the runner that is running the current job. For more information, see runner context.
secrets	object	Enables access to secrets. For more information about secrets, see "Creating and using encrypted secrets."
strategy	object	Enables access to the configured strategy parameters and information about the current job. Strategy parameters include fail-fast, job-index, job-total, and max-parallel.
matrix	object	Enables access to the matrix parameters you configured for the current job. For example, if you configure a matrix build with the os and node versions, the matrix context object includes the os and node versions of the current job.
needs	object	Enables access to the outputs of all jobs that are defined as a dependency of the current job. For more information, see needs context.
inputs	object	Enables access to the inputs of reusable workflow. For more information, see inputs context.

As part of an expression, you may access context information using one of two syntaxes.

• Index syntax: github['sha']
• Property dereference syntax: github.sha

In order to use property dereference syntax, the property name must:

• start with a-Z or _.
• be followed by a-Z 0-9 - or _.

Determining when to use contexts

GitHub Actionsは、コンテキストと呼ばれる変数の集合と、デフォルトの環境変数と呼ばれる同様の変数の集合を含みます。 これらの変数は、ワークフロー中の様々な場所で利用されることを意図したものです。

• デフォルトの環境変数: これらの変数は、ジョブを実行しているランナー上にのみ存在します。 詳しい情報については、「デフォルトの環境変数」を参照してください。
• コンテキスト: ほとんどのコンテキストはワークフローの任意の場所で利用できます。これは、デフォルトの環境変数が利用できない場所も含みます。 たとえば、式の付いたコンテキストを使って、ジョブが実行のためにランナーにまわされる前に初期の処理を行うことができます。これによって、ステップを実行すべきかを判断するために条件のifキーワード付きのコンテキストが利用できるようになります。 ジョブが実行されると、runner.osといったように、コンテキスト変数をジョブを実行しているランナーから取り出すこともできます。 ワークフロー中で様々なコンテキストが利用できる場所の詳細については「コンテキストが利用できるところ」を参照してください。

以下の例は、様々な種類の環境変数をジョブの中で合わせて利用できることを示しています。

name: CI
on: push
jobs:
  prod-check:
    if: ${{ github.ref == 'refs/heads/main' }}
    runs-on: ubuntu-latest
    steps:
      - run: echo "Deploying to production server on branch $GITHUB_REF"

この例では、if文がgithub.refコンテキストをチェックして現在のブランチ名を判断しています。その名前がrefs/heads/mainであれば、以降のステップが実行されます。 このifチェックがGitHub Actionsで処理されたなら、その結果がtrueの場合にのみジョブがランナーに送信されます。 ジョブがランナーに送信されると、ステップが実行され、環境変数の$GITHUB_REFをランナーから参照します。

github context

The github context contains information about the workflow run and the event that triggered the run. You can read most of the github context data in environment variables. For more information about environment variables, see "Using environment variables."

Property name	Type	Description
github	object	The top-level context available during any job or step in a workflow.
github.action	string	The name of the action currently running. GitHub removes special characters or uses the name __run when the current step runs a script. If you use the same action more than once in the same job, the name will include a suffix with the sequence number with underscore before it. For example, the first script you run will have the name __run, and the second script will be named __run_2. Similarly, the second invocation of actions/checkout will be actionscheckout2.
github.action_path	string	The path where your action is located. You can use this path to easily access files located in the same repository as your action. This attribute is only supported in composite actions.
github.actor	string	The login of the user that initiated the workflow run.
github.base_ref	string	The base_ref or target branch of the pull request in a workflow run. This property is only available when the event that triggers a workflow run is either pull_request or pull_request_target.
github.event	object	The full event webhook payload. For more information, see "Events that trigger workflows." You can access individual properties of the event using this context.
github.event_name	string	The name of the event that triggered the workflow run.
github.event_path	string	The path to the full event webhook payload on the runner.
github.head_ref	string	The head_ref or source branch of the pull request in a workflow run. This property is only available when the event that triggers a workflow run is either pull_request or pull_request_target.
github.job	string	The job_id of the current job.
github.ref	string	The branch or tag ref that triggered the workflow run. For branches this is the format refs/heads/<branch_name>, and for tags it is refs/tags/<tag_name>.
github.ref_name	string	The branch or tag name that triggered the workflow run.
github.ref_protected	string	true if branch protections are configured for the ref that triggered the workflow run.
github.ref_type	string	The type of ref that triggered the workflow run. Valid values are branch or tag.
github.repository	string	The owner and repository name. For example, Codertocat/Hello-World.
github.repository_owner	string	The repository owner's name. For example, Codertocat.
github.run_id	string	リポジトリ内でユニークな各実行に対する番号。 この番号は、ワークフローの実行をやり直しても変化しません、
github.run_number	string	リポジトリ内の特定のワークフローの各実行に対するユニークな番号。 この番号は、ワークフローの最初の実行時に1で始まり、新たな実行ごとにインクリメントされます。 この番号は、ワークフローの実行をやり直しても変化しません、
github.run_attempt	string	A unique number for each attempt of a particular workflow run in a repository. This number begins at 1 for the workflow run's first attempt, and increments with each re-run.
github.server_url	string	Returns the URL of the GitHub server. For example: https://github.com.
github.sha	string	The commit SHA that triggered the workflow run.
github.token	string	A token to authenticate on behalf of the GitHub App installed on your repository. This is functionally equivalent to the GITHUB_TOKEN secret. For more information, see "Authenticating with the GITHUB_TOKEN."
github.workflow	string	The name of the workflow. If the workflow file doesn't specify a name, the value of this property is the full path of the workflow file in the repository.
github.workspace	string	The default working directory for steps and the default location of your repository when using the checkout action.

env context

The env context contains environment variables that have been set in a workflow, job, or step. For more information about setting environment variables in your workflow, see "Workflow syntax for GitHub Actions."

The env context syntax allows you to use the value of an environment variable in your workflow file. You can use the env context in the value of any key in a step except for the id and uses keys. For more information on the step syntax, see "Workflow syntax for GitHub Actions."

If you want to use the value of an environment variable inside a runner, use the runner operating system's normal method for reading environment variables.

Property name	Type	Description
env	object	This context changes for each step in a job. You can access this context from any step in a job.
env.<env_name>	string	The value of a specific environment variable.

job context

The job context contains information about the currently running job.

Property name	Type	Description
job	object	This context changes for each job in a workflow run. You can access this context from any step in a job.
job.container	object	Information about the job's container. For more information about containers, see "Workflow syntax for GitHub Actions."
job.container.id	string	The id of the container.
job.container.network	string	The id of the container network. The runner creates the network used by all containers in a job.
job.services	object	The service containers created for a job. For more information about service containers, see "Workflow syntax for GitHub Actions."
job.services.<service id>.id	string	The id of the service container.
job.services.<service id>.network	string	The id of the service container network. The runner creates the network used by all containers in a job.
job.services.<service id>.ports	object	The exposed ports of the service container.
job.status	string	The current status of the job. Possible values are success, failure, or cancelled.

steps context

The steps context contains information about the steps in the current job that have already run.

Property name	Type	Description
steps	object	This context changes for each step in a job. You can access this context from any step in a job.
steps.<step id>.outputs	object	The set of outputs defined for the step. For more information, see "Metadata syntax for GitHub Actions."
steps.<step id>.conclusion	string	The result of a completed step after continue-on-error is applied. Possible values are success, failure, cancelled, or skipped. When a continue-on-error step fails, the outcome is failure, but the final conclusion is success.
steps.<step id>.outcome	string	The result of a completed step before continue-on-error is applied. Possible values are success, failure, cancelled, or skipped. When a continue-on-error step fails, the outcome is failure, but the final conclusion is success.
steps.<step id>.outputs.<output name>	string	The value of a specific output.

runner context

The runner context contains information about the runner that is executing the current job.

Property name	Type	Description
runner.name	string	The name of the runner executing the job.
runner.os	string	ジョブを実行しているランナーのオペレーティングシステム。 取り得る値はLinux、Windows、macOSのいずれか。
runner.arch	string	The architecture of the runner executing the job. Possible values are X86, X64, ARM, and ARM64.
runner.temp	string	ランナー上の一時ディレクトリへのパス。 このディレクトリは、各ジョブの開始及び終了時点で空になります。 ランナーのユーザアカウントが削除する権限を持っていない場合、ファイルは削除されないことに注意してください。
runner.tool_cache	string	GitHubホストランナーにプレインストールされているツールを含むディレクトリへのパス。 詳しい情報については、「GitHub ホストランナーの仕様」を参照してください。

needs context

The needs context contains outputs from all jobs that are defined as a dependency of the current job. For more information on defining job dependencies, see "Workflow syntax for GitHub Actions."

Property name	Type	Description
needs.<job id>	object	A single job that the current job depends on.
needs.<job id>.outputs	object	The set of outputs of a job that the current job depends on.
needs.<job id>.outputs.<output name>	string	The value of a specific output for a job that the current job depends on.
needs.<job id>.result	string	The result of a job that the current job depends on. Possible values are success, failure, cancelled, or skipped.

inputs context

The inputs context contains information about the inputs of reusable workflow. The inputs are defined in workflow_call event configuration. These inputs are passed from jobs.<job_id>.with in an external workflow.

For more information, see "Reusing workflows".

Property name	Type	Description
inputs	object	This context is only available when it is a reusable workflow.
inputs.<name>	string or number or boolean	Each input value passed from an external workflow.

Example printing context information to the log file

To inspect the information that is accessible in each context, you can use this workflow file example.

.github/workflows/main.yml

on: push

jobs:
  one:
    runs-on: ubuntu-latest
    steps:
      - name: Dump GitHub context
        env:
          GITHUB_CONTEXT: ${{ toJSON(github) }}
        run: echo "$GITHUB_CONTEXT"
      - name: Dump job context
        env:
          JOB_CONTEXT: ${{ toJSON(job) }}
        run: echo "$JOB_CONTEXT"
      - name: Dump steps context
        env:
          STEPS_CONTEXT: ${{ toJSON(steps) }}
        run: echo "$STEPS_CONTEXT"
      - name: Dump runner context
        env:
          RUNNER_CONTEXT: ${{ toJSON(runner) }}
        run: echo "$RUNNER_CONTEXT"
      - name: Dump strategy context
        env:
          STRATEGY_CONTEXT: ${{ toJSON(strategy) }}
        run: echo "$STRATEGY_CONTEXT"
      - name: Dump matrix context
        env:
          MATRIX_CONTEXT: ${{ toJSON(matrix) }}
        run: echo "$MATRIX_CONTEXT"

Context availability

Different contexts are available throughout a workflow run. For example, the secrets context may only be used at certain places within a job.

In addition, some functions may only be used in certain places. For example, the hashFiles function is not available everywhere.

The following table indicates where each context and special function can be used within a workflow. Unless listed below, a function can be used anywhere.

Path	Context	Special functions
concurrency	github, inputs
env	github, secrets, inputs
jobs.<job_id>.concurrency	github, needs, strategy, matrix, inputs
jobs.<job_id>.container	github, needs, strategy, matrix, inputs
jobs.<job_id>.container.credentials	github, needs, strategy, matrix, env, secrets, inputs
jobs.<job_id>.container.env.<env_id>	github, needs, strategy, matrix, job, runner, env, secrets, inputs
jobs.<job_id>.continue-on-error	github, needs, strategy, matrix, inputs
jobs.<job_id>.defaults.run	github, needs, strategy, matrix, env, inputs
jobs.<job_id>.env	github, needs, strategy, matrix, secrets, inputs
jobs.<job_id>.environment	github, needs, strategy, matrix, inputs
jobs.<job_id>.environment.url	github, needs, strategy, matrix, job, runner, env, steps, inputs
jobs.<job_id>.if	github, needs, inputs	always, cancelled, success, failure
jobs.<job_id>.name	github, needs, strategy, matrix, inputs
jobs.<job_id>.outputs.<output_id>	github, needs, strategy, matrix, job, runner, env, secrets, steps, inputs
jobs.<job_id>.runs-on	github, needs, strategy, matrix, inputs
jobs.<job_id>.secrets.<secrets_id>	github, needs, secrets
jobs.<job_id>.services	github, needs, strategy, matrix, inputs
jobs.<job_id>.services.<service_id>.credentials	github, needs, strategy, matrix, env, secrets, inputs
jobs.<job_id>.services.<service_id>.env.<env_id>	github, needs, strategy, matrix, job, runner, env, secrets, inputs
jobs.<job_id>.steps.continue-on-error	github, needs, strategy, matrix, job, runner, env, secrets, steps	hashFiles
jobs.<job_id>.steps.env	github, needs, strategy, matrix, job, runner, env, secrets, steps, inputs	hashFiles
jobs.<job_id>.steps.if	github, needs, strategy, matrix, job, runner, env, steps, inputs	always, cancelled, success, failure, hashFiles
jobs.<job_id>.steps.name	github, needs, strategy, matrix, job, runner, env, secrets, steps, inputs	hashFiles
jobs.<job_id>.steps.run	github, needs, strategy, matrix, job, runner, env, secrets, steps, inputs	hashFiles
jobs.<job_id>.steps.timeout-minutes	github, needs, strategy, matrix, job, runner, env, secrets, steps	hashFiles
jobs.<job_id>.steps.with	github, needs, strategy, matrix, job, runner, env, secrets, steps, inputs	hashFiles
jobs.<job_id>.steps.working-directory	github, needs, strategy, matrix, job, runner, env, secrets, steps, inputs	hashFiles
jobs.<job_id>.strategy	github, needs, inputs
jobs.<job_id>.timeout-minutes	github, needs, strategy, matrix, inputs
jobs.<job_id>.with.<with_id>	github, needs
on.workflow_call.inputs.<inputs_id>.default	github
on.workflow_call.outputs.<output_id>.value	github, jobs, inputs