ci: pin GitHub Actions to commit SHAs + add Dependabot#1
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Pin actions to immutable commit SHAs (with # vX comments) to defend against mutable-tag supply-chain attacks; add/extend a github-actions Dependabot config so the pins still receive reviewed update PRs.
allenfbyrd
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Jun 29, 2026
…lution + fold-in #6 stderr surfacing at the gate seam Fold-in #1 (Resolve-PythonExe): Hard `& python3` breaks Windows hosts — the Windows Python installer provides `python` not `python3`. Resolve-PythonExe probes python3 first (Linux/macOS), then python (Windows/cross-platform); throws fail-closed naming both if neither resolves. Defined in Invoke-Voidseal.ps1 (before Resolve-DeployProfile); BuilderVM.ps1 reuses it via the dot-source chain rather than duplicating it. Changed in Invoke-Voidseal.ps1 seam-#2 gate (line ~548): - was: `& python $readScript ...` + now: `$pyExe = Resolve-PythonExe; $pyOut = & $pyExe $readScript ...` Fold-in #6 (stderr surfacing): The original `2>&1 | Out-Null` swallowed read_outbox.py diagnostics. stderr is now captured and appended to the throw message on non-zero exit so the operator sees the actual OutboxError / parse-failure rather than a bare exit-code. Example (now visible in the InvokeVoidseal test WARNING line): "...releasing nothing. stderr: read_outbox: FAIL-CLOSED: OutboxError: sha256 mismatch for '...' (tamper)" Cross-reference comments added at the seam listing the outbox container constants (MAGIC=VSOUTBX1, 24-byte header, 104-byte record) pointing to guest/outbox.py as the single source of truth (consistent with the existing reference in host/read_outbox.py). Test floor: 564/566 Pester green (0 new failures, 2 pre-existing skips); 20/20 pytest.
allenfbyrd
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Jun 29, 2026
…image-hash match; fail-closed on mismatch/absence; deps.vhdx stays builder-owned)
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What
Pin all GitHub Actions in this repo to immutable commit SHAs (with
# vXcomments) and add/extend agithub-actionsDependabot config.Why
Tag refs like
@v4are mutable: a compromised or re-pointed tag silently changes what runs in CI (the top GitHub Actions supply-chain vector). Pinning to an immutable commit SHA removes that risk; Dependabot keeps the pins current via reviewed update PRs. Part of an org-wide move toward enablingsha_pinning_required.