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feat: remote debugger support for test runs - #733
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WalkthroughThe change adds environment-gated remote breakpoints and post-mortem debugging for test runs. It adds the ChangesRemote test debugging
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Feature · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant TestRun
participant Conftest
participant RemoteDebugger
participant DebugClient
TestRun->>Conftest: Report test exception after must-gather
Conftest->>RemoteDebugger: Start post-mortem when enabled and local pdb is inactive
RemoteDebugger->>DebugClient: Open remote debugging session
Merge Risk: 🟡 Moderate · up to Remote debugging is opt-in, but a hostname override can still expose an unauthenticated debugger beyond localhost. A dropped post-mortem connection can also end the test run with an internal error instead of a clean exit. Fix both before merging. The documentation fixes are minor. Pre-merge checks |
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 66.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 2 files. (3 skipped: 3… | Write docstrings for the functions missing them to satisfy the coverage threshold. |
| Linked Issues check |  |
Issue #732 requirements are implemented in the reviewable changes: remote_breakpoint() and remote_post_mortem() are environment-gated, loopback-only, port-configurable, xdist-aware, and integrated… |
Review the current uv.lock contents, or provide independent reviewable evidence that it contains the remote-pdb runtime dependency at a compatible version. |
✅ Passed checks (3 passed)
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly and concisely describes the main change: adding remote debugger support for test runs. Out of Scope Changes check The changes stay within issue #732scope. The pytest hook, debugger helpers, runtime dependency, README, and remote-debugging skill documentation support the requested debugging workflows, operational…
Full details: Linked Issues check
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Explanation
Issue
#732requirements are implemented in the reviewable changes:remote_breakpoint()andremote_post_mortem()are environment-gated, loopback-only, port-configurable, xdist-aware, and integrated with pytest. The README documents client attachment,-s, worker, port-forward, security, and frozen-process guidance.remote-pdbis added topyproject.toml. HIGH: Issue#732explicitly requires the runtime dependency in bothpyproject.tomlanduv.lock, butuv.lockis excluded from review. Lockfile compliance cannot be established.
Full details: Docstring Coverage
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Explanation
Docstring coverage is 66.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 2 files. (3 skipped: 3 unsupported.)
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Code Review by Qodo
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @utilities/debug.py:
- Line 85: Update the `debugger.interaction` call to pass the traceback from
`exception` rather than the exception itself, so the post-mortem session works
on Python 3.12.
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⛔ Files ignored due to path filters (1)
uv.lockis excluded by!**/*.lock
📒 Files selected for processing (4)
README.mdconftest.pypyproject.tomlutilities/debug.py
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PR Summary by QodoAdd opt-in remote debugging for test runs
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High-Level Assessment
Files changed (5)
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/qodo The following review comments were reviewed and a decision was made:
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Thanks for the update. The changes described address findings 1, 2, 3, 4, and 5, and they are recorded as resolved in the current review. |
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Code review by qodo was updated up to the latest commit 5c2c80f |
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/qodo The following review comments were reviewed and a decision was made:
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Acknowledged. finding 6 is already dismissed, and the documented design decision establishes that |
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/qodo The following review comments were reviewed and a decision was made:
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/qodo The following review comments were reviewed and a decision was made:
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Acknowledged. |
Confirmed: finding 7, Debugger quits let tests continue, is addressed in commit |
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Code review by qodo was updated up to the latest commit 8c4f8a0 |
8c4f8a0 to
e09f196
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Clean rebase detected — no code changes compared to previous head ( |
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/qodo Please re-evaluate all remaining sticky findings against the current code. |
Re-evaluated the only remaining open finding:
There are no remaining sticky findings to keep; the findings catalog currently contains 0 active findings. |
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/qodo The following review comments were reviewed and a decision was made:
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Acknowledged — finding 3, “Pod attach commands never reach the client,” is addressed in the current diff: |
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/qodo Please re-evaluate all remaining sticky findings against the current code. |
Re-evaluated the remaining sticky finding against the current code:
There are no remaining findings to keep. The finding is already marked dismissed, so no further removal action is needed. |
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/qodo Please re-evaluate all remaining sticky findings against the current code. |
Re-evaluation complete: there are no remaining active sticky findings.
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/qodo The sticky finding 'Pod attach commands never reach the client' (README.md:330, comment 6125837691) keeps appearing as unresolved in the sticky table, but you confirmed twice that it is addressed in commit 1fbb970 (oc port-forward backgrounded with recorded PID, nc connects while tunnel is up, PID killed at session end). The current README block is verified to contain the fixed version. What is needed to clear this sticky finding — is it resolved on your side, or is there remaining action on our part? |
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/qodo Please re-evaluate all remaining sticky findings against the current code. |
Re-evaluation complete: there are no remaining active sticky findings.
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/qodo Please re-evaluate all remaining sticky findings against the current code. |
Re-evaluated the remaining sticky finding against the current code:
There are no remaining active findings to keep. Finding 3 is already marked dismissed in the current findings catalog. |
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/verified |
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New container for ghcr.io/redhatqe/mtv-api-tests:latest published |
Closes #732
What
Adds remote-pdb-based debugging for test runs, gated by the
MTV_REMOTE_PDBenvironment variable — absent means zero behavior change for normal runs.Two triggers, same attach mechanism (
nc 127.0.0.1 4444):remote_breakpoint()fromutilities/debug.pyplaced temporarily at the line of interest; the run blocks there and waits for a debugger connection--pdbneeded; when--pdbIS passed the local terminal debugger takes precedence)Design
127.0.0.1only — a pdb shell is root-equivalent; pod/Job runs attach viaoc port-forward pod/<pod> 4444:4444, never an exposed portgw1→ 4445) so parallel failures don't collide; overridable viaREMOTE_PDB_HOST/REMOTE_PDB_PORTremote-pdbis a runtime dependency so it exists inside the container image-snote (pytest capture hides the listening message), single-worker recommendation, port-forward instructions, frozen-process caveatVerification
Verified locally with a scratch script and a FIFO-piped
ncclient (the AI-agent driving pattern):remote_breakpoint()blocks, accepts connection, evaluates locals (p x), continues oncremote_post_mortem()lands on the failing line with the exception availableMTV_REMOTE_PDB, both helpers return immediately (no-op path)pre-commit run --all-filespasses (mypy, ruff, all custom hooks)Assisted-by: PI (rits/zai-org/glm-5-3)
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