Sergio 0d32ec87b1
cards: la superficie de shell del producto, MEDIDA — 23 de 33 cards, 8 builtins, y ningún backtick ...
Contesta qué tendría que saber hacer un /bin/sh propio para que el producto
arranque, contado sobre el árbol y no sobre POSIX.
- 33 cards en cuatro poblaciones (recetas, bootstrap, servidor, mudanza); 23
ejecutan shell, 10 son exec directo
- el idioma es uno y se repite 18 veces: test … || { echo >&2; exit 78; }; exec …
- NO aparece nunca: if, funciones, ${…}, posicionales, $?, here-docs, subshells,
segundo plano — ni comillas invertidas, que es lo que tumbó a brush en el sandbox
- 8 builtins y 14 órdenes externas; cruzadas con busybox-applets.tsv, CERO
retiradas por el recorte 401 → 277: es el guardián que el plan pedía, y ahora
corre en un segundo
- las 23 parsean idéntico en busybox, bash y brush (banco diferencial, --files)
Hallazgo que hacía falta para medir bien: en una Card el argv va SIN argv[0] —
arje lo pone desde exec (lo dice la card de hammerd). Sin eso, el idioma de la
mudanza (exec=/bin/sh, argv=[-c, …]) desaparecía de la cuenta.
La detección respeta comillas con un escáner de estados: la primera versión
contaba 11 backticks que eran prosa dentro de mensajes de error.
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Sergio
0d32ec87b1