Add a Hermes-owned upgrade-preservation contract to the install E2E
harness: a tagged upgrade must not delete or modify anything under the
active home's plugins/** or any profile's plugins/<name>/plugins tree.
- tests/install/e2e-assets/verify-plugin-preservation.py: standalone
stdlib-only READ-ONLY verifier. snapshot records every entry (kind,
size + sha256, link target, recursive fingerprint of symlinked
external targets so the externally-owned sidecar witness is covered)
including empty dirs and the roots themselves (lstat, so dangling
root links are still scanned); verify fails on deletion or
modification, treats unreadable paths as hard errors, and refuses an
empty snapshot as inconclusive. Runs under python3/python on all
three driver platforms.
- tests/install/e2e-assets/preserve-plugins.sh: POSIX/macOS hooks.
After install: seed controlled non-dependency directory fixtures
(mnemosyne-wrapper marker + payload + symlinked runtime, second
profile plugin tree, external witness outside the home; no pyproject
in the scanned root, nothing downloaded) and snapshot. After update:
verify; violation fails the leg. Seeding never clobbers a populated
wrapper without the expected marker.
- installer-script-e2e.sh / macos-desktop-e2e.sh / windows-e2e.ps1:
wire before/after hooks into the update leg, and add --update-ref
(-UpdateRef on Windows) so a leg can target an actual stable tag
instead of HEAD; HEAD-upgrade legs keep the HEAD label. Matrix and
workflows unchanged.
- tests/scripts/test_verify_plugin_preservation.py: 17 unit tests on a
real temp filesystem covering clean survival, file/marker deletion
and modification, whole-root deletion, empty-dir deletion, symlink
repoint, external witness tamper, read-only guarantee, empty-snapshot
refusal, unreadable-path hard error (POSIX), and the exact CLI
round-trip the drivers use.
- tests/install/README.md: document the contract, the hooks, and the
stable-to-stable rule.
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