Monorepo for Tangled
localinfra: add script to validate commit messages
Signed-off-by: Spenser Black <me@spenser.black>
Spenser Black
(Jul 12, 2026, 1:45 PM EDT)
f35d05fe
2adda573
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localinfra/scripts/git-hooks/commit-msg.js
+22
localinfra/scripts/git-hooks/commit-msg.js
···
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#!/usr/bin/env node
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const fs = require("node:fs");
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// This hook receives the path to the temporary commit message file as its one and only
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// positional argument.
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const msg = fs.readFileSync(process.argv[2], { encoding: "utf-8" });
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// NOTE While technically possible that the very first line would be a comment, this
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// should be unlikely enough that we can safely test the first line.
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const title = /^([^\n]+)(?:\n|$)/.exec(msg)?.[1] || "";
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if (/^[A-Z]/.test(title) || /:\s[A-Z]/.test(title)) {
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console.error("Commit message titles should be in lowercase");
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process.exitCode = 1;
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}
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if (!/.+:\s[^\n]+/.test(msg)) {
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console.error("First line should be in the format `<service/top-level directory>/<affected package/directory>: <short summary of change>`");
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process.exitCode = 1;
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}
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if (!/\nSigned-off-by:/.test(msg)) {
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console.error("Commits must be signed-off (use `git commit -s` to add the sign-off trailer)");
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process.exitCode = 1;
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}