Run One Stressor Memory Stress-ng (New)

[mreed8855]

Description

Add single memory stressor launcher and fix stressor listing

Introduce the capability to run individual memory stressors via a new
`--stressor` flag in `stress_ng_test.py`.

To support this in the test framework:
- Add `memory_stress_ng_stressors` resource job and a single-stressor
  template job (`stress/memory_stressor_{stressor}`).

- Add `--list-stressors` flag to expose available stressors

- Move the `--list-stressors` dispatch prior to root and `stress-ng`
  binary checks so unprivileged resource discovery jobs do not fail.

- Add `memory-single-stressor` test plan and `test-memory-stressor`
  launcher to allow picking specific stressors from the selection menu.

This also allow the running of a subset of memory stressors

Resolved issues

In some instances it can take days or a week or two to run memory stress-ng for systems with a lot of RAM. This helps with debugging single stressors that fail.

Documentation

Tests

Install canonical-certification-server
Run the launcher test-memory-stressor
Select 1 or several stressors
Run

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.35%. Comparing base (9efa86b) to head (5bb87dc).
⚠️ Report is 22 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2866      +/-   ##
==========================================
+ Coverage   61.31%   61.35%   +0.04%     
==========================================
  Files         499      499              
  Lines       50326    50390      +64     
  Branches     8835     8852      +17     
==========================================
+ Hits        30855    30917      +62     
- Misses      18628    18633       +5     
+ Partials      843      840       -3     

Flag	Coverage Δ
provider-certification-server	57.14% <ø> (ø)

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[Copilot]

🟡 Changes recommended

Critical workflow and swap-protection issues, along with moderate test and cleanup issues, remain unresolved.

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Pull request overview

Adds selectable single-memory-stressor execution for stress-ng, including CLI support, test plans, jobs, and a launcher.

Changes:

• Adds --stressor and --list-stressors.
• Adds resource/template jobs and a single-stressor test plan.
• Adds the certification launcher and unit tests.

File summaries

File	Change	Review findings
providers/certification-server/launcher/test-memory-stressor	Adds the user-facing launcher.	Nit (1 vote): document the launcher in the certification-server man page.
providers/base/units/stress/test-plan.pxu	Adds the single-stressor test plan.	Critical (1 vote): include watchdog lifecycle jobs and ordering metadata. Nit (2 votes): correct the misleading exactly-one selection description.
providers/base/units/stress/stress-ng.yaml	Defines resource and templated stressor jobs.	Critical (3 votes): provide and align the minimum-swap environment variable so configured swap protection is applied.
providers/base/tests/test_stress_ng_test.py	Tests stressor discovery and execution.	Moderate (3 votes): reorder patched mock arguments. Moderate (1 vote): add coverage for vm, stack, timeouts, and thread counts.
providers/base/bin/stress_ng_test.py	Implements stressor listing and single-stressor execution.	Moderate (2 votes): clean up temporary swap when an unknown stressor is supplied.

Review details

Suppressed comments (2)

providers/base/tests/test_stress_ng_test.py:243

• This test exercises only the matrix constant-runtime branch and checks only the return code. The newly added vm and stack paths choose different timeouts and thread counts, so a regression in those settings would still pass; add assertions/cases for the variable-runtime and low-thread-count stressors.

        ["stress_ng_test.py", "memory", "--stressor", "matrix"],
    )
    def test_main_stress_memory_single_stressor(
        self,
        shutil_which_mock,

providers/certification-server/launcher/test-memory-stressor:1

• This adds a user-facing installed launcher, but providers/certification-server/debian/canonical-certification-server.rst still omits test-memory-stressor from the documented subset commands; it lists test-memory and test-stress instead. Add the new entry point to the man page so the feature is discoverable.

#!/usr/bin/env checkbox-cli

• Files reviewed: 4/5 changed files
• Comments generated: 4
• Review effort level: Lite

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