ci: use three-dot diff to isolate PR branch changes in lint check - #14366
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In .kokoro/build.sh, changed_file_list used a two-dot git diff (${BASE_SHA} ${HEAD_SHA}), which compares BASE_SHA directly to HEAD_SHA. When BASE_SHA moves ahead on main after the PR branch diverges, files merged into main on other modules were erroneously included in the diff.
Switch to a three-dot git diff (${BASE_SHA}...${HEAD_SHA}) to diff against the merge base between BASE_SHA and HEAD_SHA, matching .kokoro/common.sh get_modified_files() behavior.
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This pull request updates the .kokoro/build.sh script to use a triple-dot diff syntax between BASE_SHA and HEAD_SHA, ensuring the diff is calculated from their common ancestor. There are no review comments, and I have no feedback to provide.
blakeli0
approved these changes
Sep 14, 2026
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In .kokoro/build.sh, changed_file_list used a two-dot git diff (${BASE_SHA} ${HEAD_SHA}), which compares BASE_SHA directly to HEAD_SHA. When BASE_SHA moves ahead on main after the PR branch diverges, files merged into main on other modules were erroneously included in the diff.
Switch to a three-dot git diff (${BASE_SHA}...${HEAD_SHA}) to diff against the merge base between BASE_SHA and HEAD_SHA, matching .kokoro/common.sh get_modified_files() behavior.
Logs from lint job in #14354 which only touched a spanner file: