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[release/v7.6.3] Verify Apple codesign immediately after ESRP signing by SeeminglyScience · Pull Request #27542 · PowerShell/PowerShell

Copilot

Backport of #27486 to release/v7.6.3

Triggered by @SeeminglyScience on behalf of @andyleejordan

Original CL Label: CL-BuildPackaging

/cc @PowerShell/powershell-maintainers

Impact

REQUIRED: Choose either Tooling Impact or Customer Impact (or both). At least one checkbox must be selected.

Tooling Impact

  • Required tooling change
  • Optional tooling change (include reasoning)

Adds codesign --verify --deep --strict verification immediately after ESRP signing in Sign_macOS_* pipeline jobs. This ensures silent ESRP no-ops are caught in the signing job itself rather than discovered later in packaging, preventing publication of bad signed artifacts.

Customer Impact

  • Customer reported
  • Found internally

Regression

REQUIRED: Check exactly one box.

  • Yes
  • No

This is not a regression.

Testing

Verified by next pipeline run. This is a pipeline YAML-only change adding a defensive verification step — no unit tests apply. The original change was validated during a release build where ESRP silently no-op'd; this check would have caught it at the sign stage.

Risk

REQUIRED: Check exactly one box.

  • High
  • Medium
  • Low

Pipeline YAML only — no runtime code changes. The added step is read-only verification (codesign --verify) that fails fast rather than publishing a bad artifact. No customer-facing behavior is affected.