Beagle SCM

GET-003: be get be://localhost?/beagle (project-selector clone, empty path) dies WIRECLFL

The keeper wire protocol selects the project with a ?/project query selector — WIREServePath (keeper/WIRECLI.c:143-151) appends it to the served path, and both the local-exec and ssh keeper branches rely on it (:204-209, :242-249, "convey an explicit ?/proj so the server serves THAT shard"). But wcli_spawn rejects an empty path with WIRECLFL at :165 (and again at :237, after stripping the leading /) — before the scheme is even classified (is_be/is_keeper at :170-172) and before the query selector is used. So be get be://localhost?/beagle — the natural keeper clone form (project in the query, default store, no repo path) — dies WIRECLFL. This blocked the Issues fix-and-land loop (couldn't clone beagle over be://). It is not get-specific: be head be://localhost?/beagle and be patch fetch fail the same way (shared wire client). See GET, URI, blog/uris.mkd, CLAUDE.

Issues

The empty-path guard is scheme-blind and fires before the keeper branch's query-selector path.

• keeper/WIRECLI.c:164-165: a_dup(path, u.path); if (u8csEmpty(path)) return WIRECLFL; runs for every scheme, before is_be/is_keeper classification; a pathless be://host?/proj never reaches WIREServePath.
• Second guard :237 (after the leading-/ strip in the ssh branch) repeats the rejection.
• Keeper is designed to serve ?/<project> with no repo path; an empty path denotes the peer's default $HOME/.be store, the ?/<project> selecting the shard within it. The guard makes that unexpressible.
• Repro (read-only, isolates the wire client): be head be://localhost?/beagle → WIRECLFL / BEDOGEXIT. Same for be get/be patch fetch.
• Contrast: the git branch (ssh:/https:) genuinely needs a path (git-upload-pack <path>), so empty-path → WIRECLFL is correct there — the fix must stay scheme-specific.
• Confirm the WIRECLFL origin with ABC_TRACE first (trace-before-theorizing) — the empty-path guard is the prime suspect, but rule out a URI-parse miss on be://host?/proj (authority + query, no path) at URIutf8Drain (:159).

Blockers

None. Localized to wcli_spawn in keeper/WIRECLI.c; the WIREServePath selector machinery already exists.

Planned

Allow an empty path in the keeper branch when the query carries a ?/project selector; keep the git branch strict.

• Repro first (CLAUDE §17): a hermetic localhost keeper peer; assert be head be://localhost?/beagle resolves project beagle (exit 0) and be get be://localhost?/beagle clones a worktree — both FAIL WIRECLFL pre-fix.
• Client: move the empty-path rejection after scheme classification — for is_keeper||is_be with a non-empty ?/<proj> query, skip the :165/:237 guards and serve WIREServePath("", u.query) → ?/proj.
• Server: keeper upload-pack, given a ?/-only (empty) path, must resolve to the peer's default $HOME/.be store + the named project (verify whether the existing local-exec/row-0 default already does this, else add it).
• Keep ssh:/https:/git: (git-transport) empty-path → WIRECLFL; verify file:// local clone and pathful be://host/path are unaffected.
• Regression test under test/get (and a head case); update keeper/INDEX.md if behavior notes change.