25 lines
1.6 KiB
Markdown
25 lines
1.6 KiB
Markdown
# Package activation
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Before changing package pointers, Launcher Next writes an activation snapshot containing exact previous `current.json` and `previous.json` contents and their SHA-256 values. Files are copied to a unique staging directory and rehashed. Only then is staging moved to `packages/<package>/versions/<version>` and the package-local pointer updated atomically.
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Rollback restores the exact pointers, deletes the pilot version and startup script, and removes incomplete staging. Autodesk assemblies, PDBs, executables, test assemblies and legacy files are rejected from the pilot package.
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## Last-known-good resolution
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Each activated version retains its validated package manifest alongside its payload.
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`PackageResolutionUseCase` receives an explicit roster requirement: package ID,
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product/year/architecture, channel, exact version, roster identity and offline
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policy. On an online acquisition it stages locally, binds that requirement to the
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activated version, then revalidates through `LocalPackageStore.ResolveAsync`.
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The resolver checks manifest, binding, identity/product compatibility, entry and
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all payload lengths/SHA-256 before returning a local version. It returns current
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first. Only when current is invalid and the requirement explicitly permits offline
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fallback can it return previous. A cache entry with another roster, channel or
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version is rejected. It never reads or executes a package from DFS, and a failed
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or corrupted update never becomes last-known-good.
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Resolution emits stable evidence codes: `ONLINE_PACKAGE_SELECTED`,
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`VALID_CURRENT_CACHE_SELECTED`, `PREVIOUS_LKG_SELECTED`,
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`OFFLINE_FALLBACK_DISABLED`, and `NO_SAFE_PACKAGE_AVAILABLE`.
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