fix (storage): update documentation/comments and improve failure behavior

[abueno-nvidia]

Summary

Storage validation improvements from ISV testing feedback

• Document the large-directory counts. suites/storage.yaml now states that files_count: 10000 / dirs_count: 500 are dev-sanity values, and that HSS07-02 / N-013a and N-013b require 1,000,000 files and 500,000 subdirectories — which are already the check classes' defaults. Same note added to the check docstrings.
• Report missing local prerequisites up front. BaseValidation gains an optional preflight(config) classmethod; the orchestrator evaluates it for every ready check before handing the phase to pytest. K8sPosixComplianceCheck implements it, so a missing vendored pjdfstest tree is reported at run start instead of ~35 checks later. It is gated on a StorageClass being configured, so no-cluster and demo runs still skip silently. The hook only reports — each check still enforces its own prerequisite in run().
• Verify listed names, not just the count. The large-directory checks now save the listing once and compare it name by name in the pod with a single awk pass, replacing the previous "ls to /dev/null, then find | wc -l" pair. That is one directory scan instead of two, an ls error is still distinguished from a content mismatch, and a mismatch now names the offenders.

Parallelising large-scale file/dir creation is explicitly out of scope for this ticket.

Test plan

• make test — 1670 isvtest/isvctl/isvreporter tests + 124 script tests pass
• make lint, ruff format --check, uvx pre-commit run -a
• make demo-test — all my-isv suites pass end to end
• New unit tests: awk listing verification exercised against real awk (exact match, missing/unexpected/duplicate names, zero-padded names, and 1,000,000 indices to pin down sprintf("%d") vs awk's 1e+06 CONVFMT default); orchestrator prerequisite warning; K8sPosixComplianceCheck.preflight across the StorageClass-configured, satisfied, and unset cases
• Verified end to end with a throwaway config: [WARNING] isvctl.orchestrator.loop: Validation 'K8sPosixComplianceCheck' will fail: Vendored pjdfstest source not found at ...; run 'make vendor-pjdfstest' appears before pytest starts

Summary by CodeRabbit

• New Features

  • Added preflight checks that identify missing local prerequisites before validations run.
  • Added clearer warnings for unavailable filesystem test resources.
  • Improved large-directory validation to detect missing, unexpected, duplicate, and malformed entries.
  • Added support for configurable file and directory name prefixes.

• Bug Fixes

  • Improved filesystem verification accuracy beyond simple item counts.
  • Prevented validation commands from running when required prerequisites are unavailable.

• Documentation

  • Documented that configured large-directory test values should be increased for production validation.

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📝 Walkthrough

Walkthrough

The change adds exact name verification for large-directory filesystem checks. It introduces local prerequisite preflight checks and orchestrator warnings. Storage configuration comments now document production-scale acceptance values.

Changes

Filesystem validation and prerequisite preflight

Layer / File(s)	Summary
Exact listing verification isvtest/src/isvtest/validations/k8s_filesystem.py, isvtest/tests/test_k8s_filesystem.py	Saved directory listings are verified by exact name. Reports include matched, missing, unexpected, duplicate, and parse-error results. Tests cover numeric formats, prefixes, and malformed output.
Large-directory validation integration isvtest/src/isvtest/validations/k8s_filesystem.py, isvtest/tests/test_k8s_filesystem.py, isvctl/configs/suites/storage.yaml	Large-directory checks use configurable f and d prefixes, saved ls output, and detailed mismatch reporting. Tests cover command failures and verification results. Configuration comments identify development values and production acceptance targets.
Prerequisite preflight warnings isvtest/src/isvtest/core/validation.py, isvtest/src/isvtest/validations/k8s_filesystem.py, isvctl/src/isvctl/orchestrator/loop.py, isvctl/tests/test_orchestrator_loop.py, isvtest/tests/test_k8s_filesystem.py	Validations expose local preflight checks. Filesystem validations report missing vendored pjdfstest sources when applicable. The orchestrator logs warnings before pytest execution. Tests cover missing, present, skipped, and unknown prerequisites.

Estimated code review effort: 4 (Complex) | ~45 minutes

Merge Risk: ⚪ Minimal · up to 69505

The change improves storage validation behavior and reporting; the remaining risk is limited to adding docstrings to several helper methods, with no actionable merge-blocking risk remaining.

Sequence Diagram(s)

sequenceDiagram
  participant Orchestrator as isvctl orchestrator
  participant Discovery as discover_all_tests
  participant Validation as BaseValidation.preflight
  participant Filesystem as filesystem validation
  Orchestrator->>Discovery: discover validation classes
  Orchestrator->>Validation: resolve ready validation
  Validation->>Filesystem: check local pjdfstest prerequisite
  Filesystem-->>Validation: prerequisite message or None
  Validation-->>Orchestrator: preflight result
  Orchestrator-->>Orchestrator: log warning before pytest

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Suggested reviewers: abegnoche

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 37.29% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 59 functions across 5 files. (1 skipped: …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the pull request. It identifies the storage scope, documentation updates, and improved failure behavior.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 37.29% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 59 functions across 5 files. (1 skipped: 1 unsupported.)

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Actionable comments posted: 1

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Inline comments:
In `@isvtest/src/isvtest/validations/k8s_filesystem.py`:
- Around line 1189-1190: Add concise PEP 257 docstrings to
K8sLargeDirListingFilesCheck._create_cmd and
K8sLargeDirListingDirsCheck._create_cmd describing command construction; also
document TestVerifyListingAwk._verify, TestLargeDirListingFlow._router, and
TestLargeDirListingFlow._run with brief purpose statements. Apply changes in
isvtest/src/isvtest/validations/k8s_filesystem.py lines 1189-1190 and 1219-1220,
and isvtest/tests/test_k8s_filesystem.py lines 534-544 and 587-603.

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📥 Commits

Reviewing files that changed from the base of the PR and between dfed195 and 6950514.

📒 Files selected for processing (6)

• isvctl/configs/suites/storage.yaml
• isvctl/src/isvctl/orchestrator/loop.py
• isvctl/tests/test_orchestrator_loop.py
• isvtest/src/isvtest/core/validation.py
• isvtest/src/isvtest/validations/k8s_filesystem.py
• isvtest/tests/test_k8s_filesystem.py

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