tools: make Travis commit linting more robust

Trott · rvagg · commit 2a8a28c43660 · 2018-11-28T11:26:48.000+11:00
Use $TRAVIS_COMMIT_RANGE in .travis.yml to avoid merge commits in some situations. Refs: #23307 (comment) PR-URL: #23397 Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
diff --git a/.travis.yml b/.travis.yml
@@ -13,7 +13,7 @@ matrix:
       script:
         - make lint
         # Lint the first commit in the PR.
-        - git log HEAD ^$TRAVIS_BRANCH --pretty=format:'%h' --no-merges | tail -1 | xargs npx core-validate-commit --no-validate-metadata
+        - git log $TRAVIS_COMMIT_RANGE --pretty=format:'%h' --no-merges | tail -1 | xargs npx core-validate-commit --no-validate-metadata
     - name: "Test Suite"
       install:
         - ./configure
