@netlify/config/lib/options/repository_root.js

Netlify config module

import { dirname } from 'path';
import { findUp } from 'find-up';
// Find out repository root among (in priority order):
//  - `repositoryRoot` option
//  - find a `.git` directory up from `cwd`
//  - `cwd` (fallback)
export const getRepositoryRoot = async function ({ repositoryRoot, cwd }) {
    if (repositoryRoot !== undefined) {
        return repositoryRoot;
    }
    const repositoryRootA = await findUp('.git', { cwd, type: 'directory' });
    if (repositoryRootA === undefined) {
        return cwd;
    }
    return dirname(repositoryRootA);
};