Elamur Groupantswasi-cli-effects
The groupant beside wasi-host/src/main.rs in the Mova repository: what the code computes, what it never does, how to go back from its outputs, its invariants, cost and checks.
Facts
Implementation material. A Mova code model describes this code at one source revision: partial models, finite checks and their stated scope. It is not a reviewed general exposition, and its labels are shown as written, never raised.
Components
| component | label | where |
|---|---|---|
| approximant | partial | approximant |
| ast | partial | ../syntax.json |
| cost | symbolic source derived | invariant |
| descriptant | present | descriptant |
| invariant | partial | invariant |
| tests | executed bounded checks | tests |
Obernants
The typed relations around the forward model: the behaviour complement (what the code never does), the reverse reconstruction (every input compatible with an output) and specialised views.
| id | type | label | where |
|---|---|---|---|
behavior_complement | behavior_complement | partial source derived model | behavior_complement |
reverse_reconstruction | reverse_reconstruction | partial source derived model | reverse_reconstruction |
import_failure | import_failure | partial source derived model | import_failure |
basename_argv | basename_argv | partial source derived model | basename_argv |
export_order | export_order | partial source derived model | export_order |
status_clamp | status_clamp | partial source derived model | status_clamp |
Model text
descriptant
wasi-cli-effects
Construct limited Vfs, sequentially import each real->virtual pair, derive basename argv and append suffix, apply seed/mem/echo, run; exports gated on code0+no trap. Journal/stat occur after export loop.
Epoch 2026-10-31
Prospective review recorded before edits. Source review found late output FAULT effects and weaker-than-capability rights metadata; these are modeled as current behavior rather than silently repaired. Only bounded new test blocks were added; production code remains unchanged. Actual finite results and exact restoration receipts live under $MOVA_DATA/runs/octopus-wave31-wasi-2026-10-31. No full mlab guest, frozen suite, GPU or corpus run. This node retains its scoped observations for future refinement.
approximant
Forward relation
Construct limited Vfs, sequentially import each real->virtual pair, derive basename argv and append suffix, apply seed/mem/echo, run; exports gated on code0+no trap. Journal/stat occur after export loop.
Scope: wasi-cli-effects. State and transitions follow the authoritative source, including partial effects before errors. No executable approximate replacement is attached: categorical errno/effects and module execution lack a useful validated percentage metric; future numerical profiles may only use1/2/5/10% caps after domain/reference evidence.
invariant
Invariant and cost
Construct limited Vfs, sequentially import each real->virtual pair, derive basename argv and append suffix, apply seed/mem/echo, run; exports gated on code0+no trap. Journal/stat occur after export loop.
The invariant is conditional on the admitted transition: Once import fails, guest execution and exports are absent; once export fails, later exports/journal/stats are absent. Earlier exports need not be undone.
Cost: O(import+export traversal bytes)+Host run; journal serializes all records; stats scans distinct calls.
No wall-time gain, universal resource bound or atomic rollback is inferred. External Vfs/wasmi/native-mlab work remains separately charged.
models
Typed model catalog
behavior_complement
Subject: wasi-host/src/main.rs at SHA-256 2200229297d1dde6d9f8477a577a7320c854d0db4fb3ea450b457a9858107122, scope wasi-cli-effects. Domain: the source transition and bounded fixtures described in approximant.md; readable valid host resources where required. Observation: returned values, byte coordinates, state/effect order, not total-system semantics. Operator/relation: Once import fails, guest execution and exports are absent; once export fails, later exports/journal/stats are absent. Earlier exports need not be undone.
Status: partial source-derived relation; complement is a scoped exclusion hypothesis, reverse preserves all compatible antecedents described rather than a chosen inverse. Assumptions: production branch order, declared coordinate/resource premises; no completeness claim for untested inputs. Evidence: tests.md distinguishes actual execution from source review; finite observations can falsify but not prove the relation.
reverse_reconstruction
Subject: wasi-host/src/main.rs at SHA-256 2200229297d1dde6d9f8477a577a7320c854d0db4fb3ea450b457a9858107122, scope wasi-cli-effects. Domain: the source transition and bounded fixtures described in approximant.md; readable valid host resources where required. Observation: returned values, byte coordinates, state/effect order, not total-system semantics. Operator/relation: Successful exit with journal absent admits no request or failed journal write. Export tree loses guest descriptor/call history.
Status: partial source-derived relation; complement is a scoped exclusion hypothesis, reverse preserves all compatible antecedents described rather than a chosen inverse. Assumptions: production branch order, declared coordinate/resource premises; no completeness claim for untested inputs. Evidence: tests.md distinguishes actual execution from source review; finite observations can falsify but not prove the relation.
import_failure
Subject: wasi-host/src/main.rs at SHA-256 2200229297d1dde6d9f8477a577a7320c854d0db4fb3ea450b457a9858107122, scope wasi-cli-effects. Domain: the source transition and bounded fixtures described in approximant.md; readable valid host resources where required. Observation: returned values, byte coordinates, state/effect order, not total-system semantics. Operator/relation: First import failure returns2 before guest, preserving any earlier host reads but no exports.
Status: partial source-derived relation; complement is a scoped exclusion hypothesis, reverse preserves all compatible antecedents described rather than a chosen inverse. Assumptions: production branch order, declared coordinate/resource premises; no completeness claim for untested inputs. Evidence: tests.md distinguishes actual execution from source review; finite observations can falsify but not prove the relation.
basename_argv
Subject: wasi-host/src/main.rs at SHA-256 2200229297d1dde6d9f8477a577a7320c854d0db4fb3ea450b457a9858107122, scope wasi-cli-effects. Domain: the source transition and bounded fixtures described in approximant.md; readable valid host resources where required. Observation: returned values, byte coordinates, state/effect order, not total-system semantics. Operator/relation: argv0 is module basename or fallback module; directory path erased from guest argv0.
Status: partial source-derived relation; complement is a scoped exclusion hypothesis, reverse preserves all compatible antecedents described rather than a chosen inverse. Assumptions: production branch order, declared coordinate/resource premises; no completeness claim for untested inputs. Evidence: tests.md distinguishes actual execution from source review; finite observations can falsify but not prove the relation.
export_order
Subject: wasi-host/src/main.rs at SHA-256 2200229297d1dde6d9f8477a577a7320c854d0db4fb3ea450b457a9858107122, scope wasi-cli-effects. Domain: the source transition and bounded fixtures described in approximant.md; readable valid host resources where required. Observation: returned values, byte coordinates, state/effect order, not total-system semantics. Operator/relation: Exports are sequential and no rollback; first write failure returns2, later exports and journal skipped.
Status: partial source-derived relation; complement is a scoped exclusion hypothesis, reverse preserves all compatible antecedents described rather than a chosen inverse. Assumptions: production branch order, declared coordinate/resource premises; no completeness claim for untested inputs. Evidence: tests.md distinguishes actual execution from source review; finite observations can falsify but not prove the relation.
status_clamp
Subject: wasi-host/src/main.rs at SHA-256 2200229297d1dde6d9f8477a577a7320c854d0db4fb3ea450b457a9858107122, scope wasi-cli-effects. Domain: the source transition and bounded fixtures described in approximant.md; readable valid host resources where required. Observation: returned values, byte coordinates, state/effect order, not total-system semantics. Operator/relation: Returned code is clamp(out.exit_code,0,255); trap normally134 but printed trap alone is not return code logic.
Status: partial source-derived relation; complement is a scoped exclusion hypothesis, reverse preserves all compatible antecedents described rather than a chosen inverse. Assumptions: production branch order, declared coordinate/resource premises; no completeness claim for untested inputs. Evidence: tests.md distinguishes actual execution from source review; finite observations can falsify but not prove the relation.
tests
Checks and limits
Named actual-source tests run twice per debug/release; exact commands and numeric statuses retained externally. Test success is finite evidence only.
Exact names: wave31_cli_tiny_guest_isolated_effects.
wave31_cli_tiny_guest_isolated_effects invokes actual wasi-run with one tiny empty guest and one unreachable guest, root-local import/export/journal and two usage failures.
Five compiled production/helper-source controls: append offset, virtual clock advance, trap status, CLI export gate and newest-mtime max. Each compiles, fails its selected assertion, restores exact original bytes and passes again. These controls cover their target relations, not every node. No assertion-only mutants. See external source-test-map.json, native-commands.json, verify.rs and numeric/raw receipts in $MOVA_DATA/runs/octopus-wave31-wasi-2026-10-31. The example main and frozen mlab paths are never executed.
This page in Markdown → https://md.groupants.elamur.ai/free/en/mova/wasi-host/src/main.rs.groupant/wasi-cli-effects.groupant/