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tools: do not lint commit message if var undefined
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Check that $TRAVIS_COMMIT_RANGE is set before trying to lint commit
messages in Travis CI.

Refs: #23572 (comment)
Refs: #22842 (comment)
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Trott committed Oct 18, 2018
1 parent c1b9be5 commit 83628a4
Showing 1 changed file with 1 addition and 1 deletion.
2 changes: 1 addition & 1 deletion .travis.yml
Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@ matrix:
script:
- make lint
# Lint the first commit in the PR.
- git log $TRAVIS_COMMIT_RANGE --pretty=format:'%h' --no-merges | tail -1 | xargs npx core-validate-commit --no-validate-metadata
- \[ -z "$TRAVIS_COMMIT_RANGE" \] || 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
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