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Unify around alr; Termux CLI first (Ubuntu 26.04, tawcroot lane) - #25

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Meapri merged 36 commits into

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docs/unified-direction

Oct 11, 2026

Merged

Unify around alr; Termux CLI first (Ubuntu 26.04, tawcroot lane)#25
Meapri merged 36 commits into
mainfrom
docs/unified-direction

Commits on Oct 11, 2026
- docs: unify direction around the alr engine (ADR 0004)
  
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- third_party: vendor tawcroot (MIT) as input for ADR 0004 spike S2
  
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- bench: measure the in-process RET_TRAP round trip for ADR 0004 spike S2
  
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- evidence: RET_TRAP round trip is 0.4-0.9 us on device; D6 verdict PROCEED
  
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- Answer termios on TCGETS when glibc 2.42+ asks with TCGETS2
  
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- Default to Ubuntu 26.04 LTS, keep finding an installed 24.04
  
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- Carry the runtime's ALR_* variables across exec when a guest scrubs env
  
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- Support only Ubuntu 26.04; drop the 24.04 fallback
  
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- doctor: treat Android 17 as supported
  
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- docs: ADR 0005 Termux-first goals; T1 evidence on Ubuntu 26.04 and Android 17
  
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- acceptance: assert codex discovery, run rg via hostbin, never skip stale check
  
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- supervisor: pass through SIGSYS that carries a guest filter's RET_DATA
  
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- tawcroot: mark RET_TRAP with data 0x7477; answer PR_GET_AUXV from the guest auxv
  
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- evidence: T5 spike, tawcroot under alr's supervisor works but must not stay traced
  
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- preload: give uutils its name back; relativize symlinks made with a relative link path
  
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- Keep uutils coreutils as Ubuntu ships it; GNU repoint becomes opt-in
  
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- tests: T2 harness comparing CLI workloads with Termux natives
  
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- docs: uutils runs as shipped; T2 measured within budget
  
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- tawcroot: alr-lane build mode (-DTAWCROOT_ALR)
  
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- alr: run static and Go binaries in the tawcroot lane (ADR 0010)
  
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- docs: ADR 0010 tawcroot lane; T5 lane evidence
  
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- tawcroot: bring alr-lane's per-syscall cost within the T2 budget
  
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- tests: lane probe for fast paths and fault handling; frame limit is an error
  
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- docs: T5 lane cost met; ADR 0010 decision 7 (SIGSEGV/SIGBUS ownership)
  
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- tawcroot: trap fork-type clones so the child records its own tgid
  
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- alr: find release components next to the binary; no AppleDouble in tarball
  
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- docs: fork-then-vfork fix and relocatable release (T5 cost follow-up)
  
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- docs: /dev/full matches native Termux; why SigCgt stays visible
  
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- docs: measured alternative to the procfd band (over budget)
  
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- tawcroot: per-fd getdents64 filter keeps /proc/<pid>/fd at its own fd
  
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- docs: procfd number fixed; SigCgt cost of alternatives measured
  
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- docs: exact SigCgt measured at 1.38x; keep direct copies
  
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- docs: svc rewrite feasibility on the lane (code pages writable; risks)
  
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- docs: svc rewrite prototype cost (trampoline 621-644 ns vs trap path 1228 ns)
  
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- docs: ADR 0011 (proposed) lane svc rewrite
  
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- docs: Termux install guide for the current alr
  
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Commits

Commits on Oct 11, 2026