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68 lines
2.0 KiB
YAML
68 lines
2.0 KiB
YAML
name: _runner-pick
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# Tiny reusable workflow that classifies the trigger as either a "fork PR
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# from an untrusted contributor" or a "trusted commit" so downstream jobs
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# can trust-gate (skip secret-dependent jobs on forks) without each one
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# duplicating the gate expression.
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#
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# Caller pattern:
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#
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# jobs:
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# pick:
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# uses: ./.github/workflows/_runner-pick.yml
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#
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# real-work:
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# needs: pick
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# if: needs.pick.outputs.is_fork != 'true'
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# steps: [...]
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#
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# Outputs:
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# is_fork: "true" when the trigger is a pull_request from a fork or an
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# untrusted author_association, "false" otherwise.
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on:
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workflow_call:
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outputs:
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is_fork:
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description: '"true" if the trigger is an untrusted fork PR.'
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value: ${{ jobs.pick.outputs.is_fork }}
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permissions:
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contents: read
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jobs:
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pick:
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runs-on: ubuntu-latest
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timeout-minutes: 1
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outputs:
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is_fork: ${{ steps.decide.outputs.is_fork }}
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steps:
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- name: Harden the runner (Audit all outbound calls)
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uses: step-security/harden-runner@ab7a9404c0f3da075243ca237b5fac12c98deaa5 # v2.19.3
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with:
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egress-policy: audit
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- name: Classify the trigger
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id: decide
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env:
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PR_NUMBER: ${{ github.event.pull_request.number }}
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HEAD_REPO_FORK: ${{ github.event.pull_request.head.repo.fork }}
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AUTHOR_ASSOC: ${{ github.event.pull_request.author_association }}
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run: |
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set -eu
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if [ -z "${PR_NUMBER:-}" ]; then
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# Not a pull_request event at all (push, schedule, workflow_dispatch,
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# workflow_call from a non-PR trigger) -> trusted by default.
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is_fork=false
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elif [ "${HEAD_REPO_FORK}" = "true" ]; then
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is_fork=true
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else
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case "${AUTHOR_ASSOC}" in
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OWNER|MEMBER|COLLABORATOR) is_fork=false ;;
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*) is_fork=true ;;
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esac
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fi
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echo "is_fork=${is_fork}" >> "$GITHUB_OUTPUT"
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