ci: upload Codecov coverage from fork and Dependabot PRs - #252
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Coverage upload failed on fork and Dependabot PRs because GitHub withholds
secrets from their pull_request runs, leaving CODECOV_TOKEN empty and the
upload rejected ("Token required because branch is protected").
Switch the trigger to pull_request_target, which runs in the base-repo
context where the token is available. Each checkout fetches the PR head sha
so coverage reflects the PR's code, and the upload passes override_commit
/override_pr to attribute coverage to the PR head. Guard the upload to PR
events or pushes to master, since Dependabot branch pushes lack the token.
This exposes the upload-only token to PR code, which is acceptable here.
Also upload from every matrix version, each under a per-version flag
(python-3.10 ... python-3.14); Codecov merges all uploads for a commit. Add
codecov.yml with after_n_builds so the report is not finalized from a
partial set of uploads.
----
Prompt:
```
Debug #251 - why does the
codecov action fail and what do I have to do to fix it?
```
Follow-up: clarified to provide accurate coverage on any external PR (not
just avoid failing), with CODECOV_TOKEN exposure acceptable; and to upload
from all matrix versions rather than one.
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Coverage upload failed on fork and Dependabot PRs because GitHub withholds secrets from their
pull_requestruns, leavingCODECOV_TOKENempty and the upload rejected ("Token required because branch is protected").pull_request_target(runs in base-repo context, so the token is available). Each checkout fetches the PR head sha and the upload passesoverride_commit/override_prso coverage reflects and is attributed to the PR's code.master; Dependabot branch pushes lack the token.python-3.10…python-3.14); Codecov merges all uploads for a commit. Addcodecov.ymlwithafter_n_buildsso the report isn't finalized from a partial set.This exposes the upload-only token to PR code, which is acceptable here.
Note: the new trigger is evaluated from
master, so it takes effect on the next PR after merge, not on this one.This change is