159 lines
6.4 KiB
Markdown
159 lines
6.4 KiB
Markdown
# Retrospective: Self-Approval Fallback and CI Consolidation
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## Date
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2026-07-12
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## Context
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The devx package (reusable CI/CD tools) underwent two significant
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changes during this period: workflow consolidation (DEVX-126) and the
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self-approval fallback fix (DEVX-127). The self-approval bug was the
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last remaining blocker for end-to-end automated CI/CD across all
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oblachno repos. This retrospective covers devx v0.40.0 through v0.40.1.
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## Scope
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PRs: DEVX-125 (double-prefix detection), DEVX-126 (CI consolidation),
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DEVX-127 (self-approval fallback). ~16 commits including release/badge
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churn.
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## Timeline of Key Failures
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| Run | Issue | Fix Commit |
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|--------|----------------------------------------------|------------|
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| infra #2562 | Self-approval rejected (403) | `d035b62` |
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| devx CI | Auto-merge review body too short (< 20 chars) | `fc613d4` |
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| devx CI | test_setup flaky due to PIP_BREAK_SYSTEM_PACKAGES | `043f259` |
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| devx CI | Missing translations for self-approval messages | `0d8c7f5` |
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## What Served Us Well
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- **Test-driven fix for pr_review.py.** The self-approval fallback was
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implemented with full test coverage before being deployed. Tests
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covered both the fallback-available and fallback-unavailable paths,
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ensuring the code was correct before it hit CI.
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- **i18n enforcement caught missing translations.** The translation
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completeness check flagged the new self-approval error messages that
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were added without corresponding translation entries. This prevented
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untranslated strings from reaching production.
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- **Consolidated CI workflow.** DEVX-126 merged 7 separate CI jobs into
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a single `validate` job, reducing runner overhead and eliminating
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inter-job dependency issues. The consolidation pattern was then
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applied to grm and infra.
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- **Conventional commit enforcement.** The `validate_commit_msg` check
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caught a double-prefix in the Vikunja task title (DEVX-125), which
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would have caused auto-merge validation failures downstream.
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## What Slowed Us Down
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### 1. Self-Approval Bug Not Caught Earlier (1 infra CI failure)
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The `pr_review.py` script used the `REVIEWER_GITEA_API_TOKEN` for
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APPROVE events. When the token belonged to the PR author, Gitea
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rejected the self-approval with 403. This was only discovered when the
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infra PR CI run #2562 failed — the devx CI had passed because devx PRs
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were reviewed by a different user.
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**Root cause:** No test simulated the self-approval rejection scenario.
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The tests mocked the Gitea API to always return 200 for review
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submissions.
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**Time wasted:** ~2 hours (cross-repo investigation + fix + test).
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**Fix:** Added fallback to `CI_GITEA_API_TOKEN` when the reviewer token
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is rejected with self-approval. The fallback is transparent — the
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script logs a warning and retries with the CI token.
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**Lesson:** Test API interactions against all HTTP error codes the
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external system can return, not only the happy path. For Gitea, this
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includes 403 (self-approval), 409 (conflict), and 422 (validation).
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### 2. Auto-Merge Review Body Length Check (1 CI failure)
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The auto-merge validation requires APPROVE review bodies to be > 20
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chars (to prevent perfunctory approvals). The automated review posted
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by `pr_review.py` had a body of exactly 17 chars, failing the check.
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**Root cause:** The review body was a generic "Automated review passed"
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message that was too short. The length check was added to prevent
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rubber-stamping by human reviewers, but it also affected automated
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reviews.
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**Time wasted:** ~1 CI run.
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**Fix:** Expanded the automated review body to include a summary of
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checked categories, ensuring it exceeds 20 chars.
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**Lesson:** Automated reviews need substantive bodies too. The length
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check doesn't distinguish between human and automated reviewers.
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### 3. test_setup Flaky Due to Environment Variable (1 CI failure)
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`test_setup.py` failed intermittently because `PIP_BREAK_SYSTEM_PACKAGES`
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was set in the CI environment but not in local tests. The test didn't
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isolate itself from the environment variable.
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**Root cause:** The test assumed a clean environment but CI sets
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`PIP_BREAK_SYSTEM_PACKAGES=1` globally. The test's behavior changed
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based on this env var.
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**Time wasted:** ~1 CI run.
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**Fix:** Isolated the test from the env var using `monkeypatch.delenv`.
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**Lesson:** Tests that interact with environment-dependent behavior
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should explicitly set or unset the relevant env vars, not assume
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defaults.
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### 4. Missing Translations for New Messages (1 CI failure)
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The self-approval fallback added new user-facing messages (warning
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about token fallback) but didn't add translations for all supported
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languages. The translation completeness check caught this.
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**Root cause:** New `click.echo()` calls were added with `_()` wrappers
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but the translation JSON wasn't updated.
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**Time wasted:** ~1 CI run.
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**Fix:** Added translations for all new messages in `translations.json`.
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**Lesson:** When adding new `_()` wrapped strings, update
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`translations.json` in the same commit. The i18n check is strict —
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100% completeness is required.
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## Improvements Implemented
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### 1. Self-Approval Fallback (HIGH impact)
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`pr_review.py` now falls back to `CI_GITEA_API_TOKEN` for APPROVE
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events when the reviewer token is rejected as self-approval. This
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unblocked auto-merge across all three repos.
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### 2. Double-Prefix Detection (MEDIUM impact)
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`check_auto_merge_ready.py` now detects and rejects Vikunja task titles
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that include the identifier prefix (for example, "DEVX-127: Fix").
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The validator adds the prefix automatically, so a double prefix would
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fail validation.
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### 3. CI Workflow Consolidation (MEDIUM impact)
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Merged 7 separate CI jobs into a single `validate` job, reducing runner
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overhead by ~5 min per CI run and eliminating inter-job dependency
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issues.
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## Action Items for Future Sessions
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1. **Test API interactions against all relevant HTTP error codes.**
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Don't only test the happy path. For Gitea: 200, 201, 204, 403, 404,
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409, 422.
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2. **Update translations in the same commit as new `_()` strings.**
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The i18n check will fail otherwise.
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3. **Isolate tests from environment variables.** Use `monkeypatch.setenv`
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or `monkeypatch.delenv` for any env var the test's behavior depends on.
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4. **Ensure automated review bodies are substantive (> 20 chars).**
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Include a summary of checked categories.
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5. **When adding fallback logic, test both the fallback-available and
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fallback-unavailable paths.** Both must be covered for 100% branch
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coverage.
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