Certain contexts should be treated as untrusted input, as an attacker could insert their own malicious content. Warning: When creating workflows and actions, you should always consider whether your code might execute untrusted input from possible attackers. For more information about environment variables, see " Variables." You can also read most of the github context data in environment variables. The github context contains information about the workflow run and the event that triggered the run. The following example demonstrates how these different types of variables can be used together in a job: name: CI on: push jobs: prod-check: if: $ run: echo "$MATRIX_CONTEXT" github context For details of where you can use various contexts within a workflow, see " Context availability." Once the job is running, you can also retrieve context variables from the runner that is executing the job, such as runner.os. For example, you can use contexts with expressions to perform initial processing before the job is routed to a runner for execution this allows you to use a context with the conditional if keyword to determine whether a step should run. Contexts: You can use most contexts at any point in your workflow, including when default variables would be unavailable.Default environment variables: These environment variables exist only on the runner that is executing your job.These variables are intended for use at different points in the workflow: GitHub Actions includes a collection of variables called contexts and a similar collection of variables called default variables. If you attempt to dereference a non-existent property, it will evaluate to an empty string. In order to use property dereference syntax, the property name must start with a letter or _ and contain only alphanumeric characters, -, or _. Property dereference syntax: github.sha.For more information, see inputs context.Īs part of an expression, you can access context information using one of two syntaxes. For more information, see needs context.Ĭontains the inputs of a reusable or manually triggered workflow. For more information, see matrix context.Ĭontains the outputs of all jobs that are defined as a dependency of the current job. For more information, see strategy context.Ĭontains the matrix properties defined in the workflow that apply to the current job. Information about the matrix execution strategy for the current job. For more information, see secrets context. For more information, see runner context.Ĭontains the names and values of secrets that are available to a workflow run. Information about the runner that is running the current job. Information about the steps that have been run in the current job. For more information, see job context.įor reusable workflows only, contains outputs of jobs from the reusable workflow. Information about the currently running job. For more information, see env context.Ĭontains variables set at the repository, organization, or environment levels. For more information, see github context.Ĭontains variables set in a workflow, job, or step. ![]() For more information, see " Security hardening for GitHub Actions." Context name Int -> -> .Warning: When creating workflows and actions, you should always consider whether your code might execute untrusted input from possible attackers. ![]() We rather expect the function to accept code values with various patterns of contexts and to have multiple types that differ only in contexts: e.g., have proposed contextual modal type theory, which has modal types with fine-grained information on free variables: modal types are explicitly indexed by contexts-the types of all free variables in code values. In modal type systems, modality corresponds to a type constructor for code types and controls free variables and their types in code values. Modal types-types that are derived from proof systems of modal logic-have been studied as theoretical foundations of metaprogramming, where program code is manipulated as first-class values.
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