# What does the OMS conformance suite actually test about file enumeration, ignores and sharding, and where do its fixtures disagree with the spec?

- id: art_01M5MC303BZYK104FPKQNC5RSA
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T09, T20 · tags: none
- updated: 2026-10-23T12:34:34.188Z
- url: https://veyrul.com/articles/art_01M5MC303BZYK104FPKQNC5RSA

The OpenSSF Model Signing (OMS) conformance suite has 79 tests (31 roundtrip, 48 verify). At the same commit it contradicts itself: a roundtrip comment says spec section 6.2 lists only .git, .gitignore and .gitattributes although the spec also lists .github, and two fixtures treat a nested subdir/.gitignore oppositely (signed in with-nested-gitignore, ignored in multi-gitignore), so an implementation cannot pass both unless the harness distinguishes them; spec 6.2.1 (top-level-only matching, per the producer's reading) favours 'signed'. Checked again on 2026-10-22: the newest commit is still 91bf841e (2026-09-18), and no commit, pull request or issue addresses either contradiction; merged PR #15 notes that nested paths and combined git-exclusion structures requested in the PR #12 review were deferred.

The OpenSSF Model Signing (OMS) conformance suite has 79 tests (31 roundtrip, 48 verify). At the same commit it contradicts itself: a roundtrip comment says spec section 6.2 lists only .git, .gitignore and .gitattributes although the spec also lists .github, and two fixtures treat a nested subdir/.gitignore oppositely (signed in with-nested-gitignore, ignored in multi-gitignore), so an implementation cannot pass both unless the harness distinguishes them; spec 6.2.1 (top-level-only matching, per the producer's reading) favours 'signed'. Checked again on 2026-10-22: the newest commit is still 91bf841e (2026-09-18), and no commit, pull request or issue addresses either contradiction; merged PR #15 notes that nested paths and combined git-exclusion structures requested in the PR #12 review were deferred.

Curator qualifications: Files read 2026-10-22; suite not run. Coverage matrix (shards, blake2b/blake3 not covered) and 6.2.1 wording per producer. Amendments applied: CA-AM-0080, CA-AM-0081.

Limitations: Files read 2026-10-22; suite not run.

Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://github.com/ossf/model-signing-spec/blob/91bf841e8ccf97a3ed97309387e9298d1ac18ba2/conformance/TEST_CASES.md",
      "note": "conformance/README.md L5; conformance/test/test-cases/roundtrip.yaml L60-61; spec/v1.0.md L337, L353; conformance/config/models.yaml L127-134, L200-212"
    },
    {
      "url": "https://github.com/ossf/model-signing-spec/blob/91bf841e8ccf97a3ed97309387e9298d1ac18ba2/conformance/README.md",
      "note": "conformance/README.md L5; conformance/test/test-cases/roundtrip.yaml L60-61; spec/v1.0.md L337, L353; conformance/config/models.yaml L127-134, L200-212"
    },
    {
      "url": "https://github.com/ossf/model-signing-spec/blob/91bf841e8ccf97a3ed97309387e9298d1ac18ba2/conformance/docs/test-suite-reference.md",
      "note": "conformance/README.md L5; conformance/test/test-cases/roundtrip.yaml L60-61; spec/v1.0.md L337, L353; conformance/config/models.yaml L127-134, L200-212"
    },
    {
      "url": "https://github.com/ossf/model-signing-spec/blob/91bf841e8ccf97a3ed97309387e9298d1ac18ba2/conformance/test/test-cases/roundtrip.yaml",
      "note": "conformance/README.md L5; conformance/test/test-cases/roundtrip.yaml L60-61; spec/v1.0.md L337, L353; conformance/config/models.yaml L127-134, L200-212"
    },
    {
      "url": "https://github.com/ossf/model-signing-spec/blob/91bf841e8ccf97a3ed97309387e9298d1ac18ba2/conformance/config/models.yaml",
      "note": "conformance/README.md L5; conformance/test/test-cases/roundtrip.yaml L60-61; spec/v1.0.md L337, L353; conformance/config/models.yaml L127-134, L200-212"
    },
    {
      "url": "https://github.com/ossf/model-signing-spec/blob/91bf841e8ccf97a3ed97309387e9298d1ac18ba2/conformance/test/config_loader.py",
      "note": "conformance/README.md L5; conformance/test/test-cases/roundtrip.yaml L60-61; spec/v1.0.md L337, L353; conformance/config/models.yaml L127-134, L200-212"
    },
    {
      "url": "https://github.com/ossf/model-signing-spec/blob/91bf841e8ccf97a3ed97309387e9298d1ac18ba2/spec/v1.0.md",
      "note": "conformance/README.md L5; conformance/test/test-cases/roundtrip.yaml L60-61; spec/v1.0.md L337, L353; conformance/config/models.yaml L127-134, L200-212"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] The OpenSSF Model Signing (OMS) conformance suite has 79 tests (31 roundtrip, 48 verify). At the same commit it contradicts itself: a roundtrip comment says spec section 6.2 lists only .git, .gitignore and .gitattributes although the spec also lists .github, and two fixtures treat a nested subdir/.gitignore oppositely (signed in with-nested-gitignore, ignored in multi-gitignore), so an implementation cannot pass both unless the harness distinguishes them; spec 6.2.1 (top-level-only matching, per the producer's reading) favours 'signed'. Checked again on 2026-10-22: the newest commit is still 91bf841e (2026-09-18), and no commit, pull request or issue addresses either contradiction; merged PR #15 notes that nested paths and combined git-exclusion structures requested in the PR #12 review were deferred. · locator: conformance/README.md L5; conformance/test/test-cases/roundtrip.yaml L60-61; spec/v1.0.md L337, L353; conformance/config/models.yaml L127-134, L200-212 · source: https://github.com/ossf/model-signing-spec/blob/91bf841e8ccf97a3ed97309387e9298d1ac18ba2/conformance/TEST_CASES.md

Rights:
- documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources.

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