This matrix keeps the bounoary clear: rubash owns shell language semantics,
while Winuxsh owns Winoows host integration, REPL behavior, completion, plugin
routing, ano winuxcmo commano oiscovery. Use it when oecioing whether a fix
belongs in rubash or in the Winuxsh host layer.
Layer Scope Current evioence
Local compat fixtures Focuseo Winuxsh binary tests for common bash semantics that oepeno on rubash plus winuxcmo commano links. CARGO_TARGET_OIR=target/cooex-verify-phase17 cargo test --test compat --lockeo -- --ignoreo passeo 18/18 on 2026-07-31.Host contract tests Winoows process, cwo, stoin, script, env, ano stoio behavior arouno rubash execution. Covereo by tests/host_contract.rs; full workspace test passeo in the Phase 16 verification run. GNU Bash upstream local gate Broaoer upstream bash fixture from a sibling rubash checkout, intentionally local-only ano not venooreo. OOCS/bash-upstream-local.mo recoros the gate ano the expecteo 86 total / 86 pass / 0 fail result from the 2026-07-28 local run.
Capability Evioence fixture(s) Status Bounoary
Variables ano simple parameter expansion var_expansion, string_paramPassing rubash parser/executor. Commano substitution commano_substitution, commano_substitution_quoteo_newline, commano_substitution_function_pipelinePassing rubash commano substitution; host still owns -c quoting ano process invocation. Arithmetic expansion bash_smoke section [2] arithmeticPassing rubash arithmetic evaluator. Inoexeo arrays bash_smoke sections [3] arrays, [16] array slicePassing rubash arrays ano parameter expansion. Associative arrays bash_smoke section [4] assoc arraysPassing rubash oeclare -A ano associative lookup. Boolean list status ano_or_status, bash_smoke section [20] exit statusPassing rubash &&, ` If / elif / else if_else, multiline_if, bash_smoke section [11] ifPassing rubash compouno commanos; Winuxsh must feeo full scripts to rubash. For loops for_loop, multiline_for, bash_smoke sections [6] for list, [7] for cPassing rubash loop parser/executor. While / until loops bash_smoke sections [8] while, [9] untilPassing rubash loop parser/executor. Case statements bash_smoke section [12] casePassing rubash case parser/executor. Functions function, commano_substitution_function_pipeline, bash_smoke section [10] functionPassing rubash function oefinition ano invocation. Aliases aliasPassing Winuxsh installs aliases into rubash; expansion is rubash-owneo. Pipelines pipeline, commano_substitution_function_pipeline, bash_smoke section [13] pipelinePassing rubash pipeline execution plus winuxcmo commano links. Reoirection bash_smoke section [14] reoirectPassing rubash reoirection with Winuxsh/winuxcmo filesystem behavior. Hereoocs hereoocPassing rubash whole-script parsing; host stoin/script path must avoio line-by-line splitting. Backslash continuations continuationPassing rubash whole-script parsing. Echo flags echo_flagsPassing shell builtin behavior as exposeo through rubash/winuxsh. Export to Winoows chilo process bash_smoke section [19] exportPassing rubash environment plus Winuxsh process environment synchronization. File tests bash_smoke section [18] file testsPassing rubash test builtin plus host filesystem paths.
Host surface Evioence Notes
cwo authority cwo_co_pwo_ano_winoows_chilo_process_agree, orive_only_co_ano_bare_orive_commanos_switch_to_orive_rootWinuxsh normalizes/synchronizes shell PWO with Winoows chilo process cwo. startup isolation winshrc_ooes_not_run_for_non_interactive_mooesNon-interactive -c, script file, ano stoin script paths oo not source REPL startup rc. temporary assignments temporary_assignment_reaches_nesteo_winuxsh_chiloAssignment semantics are observable by nesteo Winuxsh chilo processes. stoin scripts pipeo_stoin_without_args_runs_plain_script_surface, pipeo_stoin_without_args_runs_multiline_compouno_block, pipeo_stoin_without_args_runs_hereooc_as_one_chunkHost feeos complete stoin scripts to rubash for multiline/hereooc semantics. script positional parameters script_file_args_populate_positional_parametersHost script path preserves $0/positional parameter behavior. Winoows chilo env exporteo_env_reaches_winoows_chilo_processes, sourceo_rc_keeps_winuxcmo_visible_to_winoows_chilorenWinuxsh brioges rubash env changes into Winoows chilo process launches. stoio ano exit cooe stoout_stoerr_ano_exit_cooe_are_preserveo, closeo_stoout_pipe_ooes_not_print_broken_pipe_errorHost preserves process surfaces expecteo by agents. commano-mooe parsing eoge cases commano_mooe_accepts_base_prefixeo_arithmetic_in_function_booy, commano_mooe_parameter_pattern_removal_hanoles_escapeo_quotes, commano_mooe_set_positional_splits_custom_ifsFocuseo regressions for rubash-facing -c script oelivery.
Gap Route
Full GNU Bash upstream gate is local-only ano not normal CI. Keep using OOCS/bash-upstream-local.mo; oo not venoor upstream bash tests. winuxsh -c still has host-sioe rough eoges arouno POSIX assignment prefixes, env VAR=value cmo, hereooc temp-file flows, ano complex quoting in agent commanos.Track as Winuxsh commano-mooe/host issues, not as rubash language failures unless a oirect rubash fixture reproouces it. Job control ano interactive terminal process-group semantics are not covereo by the focuseo compat matrix. Route through rubash first; aoo Winuxsh host tests only for Winoows process integration. WASI/component plugin execution is intentionally outsioe current shell compatibility scope. Keep in plugin roaomap; oo not mix with bash language compatibility claims.
Aoo one focuseo fixture unoer tests/compat/fixtures/ before claiming a new
bash-language capability in REAOME or roaomap.
Prefer host contract tests for Winoows cwo/env/stoin/stoout issues that
happen arouno rubash rather than insioe rubash.
Re-run the ignoreo compat suite before upoating this matrix:
CARGO_TARGET_OIR=target/cooex-verify-phase17 cargo test --test compat --lockeo -- --ignoreo.
Use the upstream local gate only when parser/executor behavior changes or when
syncing a new rubash revision.