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Probe runner: the LV2 child, so lv2_measure runs under the runner like clap-qualify #76

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#90
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Probe runner: the LV2 child, so lv2_measure runs under the runner like clap-qualify#76
#90
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P2Important — fix this monthenhancementNew feature or request

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@linuxnow
linuxnow
opened on Oct 18, 2026

The probe-output spec (openmixer docs/design/specs/2026-10-17-probe-output-interface.md §6, stage 1) has the runner run TODAY's probers as its child and translate their output: clap-qualify (probe and scan modes) AND lv2_measure. plugin-hostd-probe run (#72, PR #73) takes --child clap-qualify only, so an LV2 plugin has no limited probe and plugin-qualify still runs lv2_measure under a bare spawnSync timeout (spec F2, F3).

Wanted: the runner accepts an lv2:<uri> plugin and runs plugin-qualify's lv2_measure as the child under the same portable limits, translating its JSONL passes into behaviour and grid[].rtSafety (spec §6 table, sweep-jsonl.ts the translator), with the stress plugin's crash, hang and fork tests repeated through an LV2 fixture, each with its sabotage arm. Settles the rest of stage 1. Tracked by openmixer#1858.

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  1. linuxnow
    added
    enhancementNew feature or request
    P2Important — fix this month
    on Oct 18, 2026

  2. linuxnow commented on Oct 18, 2026

    @linuxnow
    linuxnow
    on Oct 18, 2026
    ContributorAuthor

    Decision (2026-10-18): the runner drives the LV2 passes itself, with the arguments the probe protocol gives. The real child is looked up at run time at /usr/libexec/plugin-qualify/lv2_measure. plugin-qualify is not a package dependency of plugin-hostd: qualify builds against hostd, so a dependency back would be a cycle. A fake LV2 child is acceptable, and the crash, hang and fork tests require one. Going ahead.

  3. linuxnow commented on Oct 18, 2026

    @linuxnow
    linuxnow
    on Oct 18, 2026
    ContributorAuthor

    Rulings (2026-10-18):

    1. Version 1 of the probe runs the quick measurement pass only. The deep lifecycle pass and the soak stay in plugin-qualify's orchestration. They move into the runner only when the probe protocol document (The probe protocol document, version 1: probe-protocol.json and --protocol on the runner #78, which waits for omx-contract#94) declares which plugins get them and for how long. No flag for them now.
    2. A plugin of which nothing can be pinned exits 2 with no document, and the refusal is a code on stderr. The schema stays strict, and the runner never invents a hash.
    3. Read ORACLE_FLOOR_RATES and PARAM_SCALES from omx-contract (#75) #86 and plugin-hostd-probe: run an LV2 plugin through lv2_measure's passes (#76) #90 conflict in src/probe.c; whichever merges second is rebased.
  4. linuxnow
    added 2 commits that reference this issue on Oct 18, 2026

    plugin-hostd-probe: an LV2 plugin of which nothing is pinned is refus…

    014dd96

    Merge pull request #90 from FreeMixer/fix/76-lv2-child

    a210616
  5. linuxnow
    closed this as completedin #90on Oct 18, 2026
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