The following example demonstrates how these different types of environment variables can be used together in a job: name: CI on: push jobs: prod-check: if: $ runs-on: ubuntu-latest steps: - run: echo "Deploying to production server on branch $GITHUB_REF" 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 environment variables would be unavailable.For more information, see " Default environment variables."
Default environment variables: These 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 environment variables. In order to use property dereference syntax, the property name must: Property dereference syntax: github.sha.For more information, see inputs context.Īs part of an expression, you may access context information using one of two syntaxes. For more information, see needs context.Įnables access to the inputs of reusable workflow. 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.Įnables access to the outputs of all jobs that are defined as a dependency of the current job. Strategy parameters include fail-fast, job-index, job-total, and max-parallel.Įnables access to the matrix parameters you configured for the current job. For more information about secrets, see " Creating and using encrypted secrets."Įnables access to the configured strategy parameters and information about the current job. For more information, see runner context.Įnables access to secrets. Information about the runner that is running the current job. Information about the steps that have been run in this job. Information about the currently executing job. For more information, see github context.Ĭontains environment variables set in a workflow, job, or step. For more information, see " Expressions." For more information, see " Understanding the risk of script injections."Ĭontexts are a way to access information about workflow runs, runner environments, jobs, and steps. Certain contexts should be treated as untrusted input, as an attacker could insert their own malicious content.
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Warning: When creating workflows and actions, you should always consider whether your code might execute untrusted input from possible attackers.
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