ci: switch to Coveralls' first-party GitHub Action

Dropped `coveralls` dev-requirement in favor of using the `coverage`
package directly, and upgraded it to the latest release series (7.x).

The `line_bits` table in .coverage (SQLite DB of results, generated by
`coverage`) isn't populated. coverallsapp/coverage-reporter tries an SQL
query against the database based on this empty table, and fails because
there aren't any coverage results to upload.

We work around this by having `coverage xml` generate a file format that
the reporter can understand.

In `.coveragerc`, switched from setting the `source` option to using the
`include` option instead; this fixes incorrect relative paths being
reported to Coveralls (which breaks both source-fetching and the tree).

.coveragerc

@@ -1,6 +1,7 @@
 # Sample conf file from http://nedbatchelder.com/code/coverage/config.html
 [run]
-source = sopel
+include =
+ sopel/*
 branch = True
 omit =
  sopel/web.py

.github/workflows/ci.yml

@@ -41,12 +41,16 @@ jobs:
  run: make lint
  - name: Run pytest
  run: make test_norecord
+ - name: Generate XML coverage report
+ # Coveralls reporter doesn't understand branch coverage in .coverage DB
+ # and conversion to LCOV doesn't work right either
+ run: coverage xml
  - name: Upload coverage data to coveralls.io
- run: coveralls --service=github
- env:
- GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
- COVERALLS_FLAG_NAME: ${{ matrix.python-version }}
- COVERALLS_PARALLEL: true
+ uses: coverallsapp/github-action@v2
+ with:
+ flag-name: ${{ matrix.python-version }}
+ parallel: true
+ file: coverage.xml
 
  coveralls:
  if: ${{ github.repository_owner == 'sopel-irc' }}
@@ -55,11 +59,9 @@ jobs:
  name: Finalize job on coveralls.io
  needs: tests
  runs-on: ubuntu-latest
- container: python:3-slim
  steps:
  - name: Notify coveralls.io
- run: |
- pip install --upgrade coveralls
- coveralls --finish
- env:
- GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+ uses: coverallsapp/github-action@v2
+ with:
+ parallel-finished: true
+ carryforward: all

dev-requirements.txt

@@ -1,5 +1,5 @@
 # These are requirements to develop Sopel itself.
-coveralls>=2.0
+coverage~=7.0
 flake8>=5
 flake8-coding
 flake8-future-import