The three fail-closed cases cleared IMPECCABLE_BIN and pointed
IMPECCABLE_HOME at a temp dir, but locate() prefers an installed
@impeccable/cli-<os>-<arch> before the cache or a download. Those
platform packages ship with every engine release and are a merge
prerequisite, so as soon as one is installed under the repo the cases
would resolve it and go green without fetching anything. Confirmed by
hand: with a platform package staged in node_modules, running the shim
against an unreachable download base still exits 0 from the package.
The shim now runs from a throwaway copy at <tmp>/cli/bin/cli.js beside a
copy of the repo's package.json, with no node_modules on the lookup path
above it, so require.resolve of the platform package fails the way it
does on a machine without the optional dependency. Production code is
unchanged; there is no test-only branch in the shim.
The fixture server also records every request now, and each download case
asserts the asset and sidecar URLs were actually requested, so a future
lookup shortcut fails loudly instead of passing on an untested path. A
sixth case installs a fake platform package next to the staged shim and
asserts the shim prefers it with the server untouched, which pins the
precedence the other cases depend on being absent.
Co-Authored-By: Claude Code <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Vau2X53xGTjjTCXWMVBoNY
The skill launcher and `impeccable install` both fail closed when a
release binary's `.sha256` sidecar cannot be fetched or carries no hash:
they refuse rather than cache an unverified binary. The npm shim did not.
It only compared when a hash was present, so a 404, an empty sidecar, or
a truncated one all wrote the payload straight into
`~/.impeccable/bin/<version>/` and exec'd it.
It now refuses in the same cases, with wording that matches the launcher,
and writes nothing until the hash matches, so a refusal leaves the cache
dir empty. IMPECCABLE_BIN and the optional-dependency lookup are
untouched: neither downloads.
tests/cli-shim.test.mjs runs the real shim against a throwaway HTTP
server and covers missing, empty, and mismatched sidecars, plus the
matching-sidecar and IMPECCABLE_BIN paths. The two refusal cases fail
against the old shim.
Co-Authored-By: Claude Code <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Vau2X53xGTjjTCXWMVBoNY
Paul BakausandClaude Code