Function repoRootWith

packages/computer/src/git/reads.ts:288–305

(opts: RepoRootWithDeps)

 * finding a `.git`.
 */
export async function repoRootWith(opts: RepoRootWithDeps): Promise<string> {
  const start = normalizeAbsolute(opts.dir ?? "/");
  const fs = opts.fs as StatFsClient;
  let current = start;
  while (true) {
    const gitPath = current === "/" ? "/.git" : `${current}/.git`;
    try {
      await fs.promises.stat(gitPath);
      return current;
    } catch {
      // Not here; climb one level.
    }
    if (current === "/") break;
    const slash = current.lastIndexOf("/");
    current = slash <= 0 ? "/" : current.slice(0, slash);
  }
  throw new NotARepositoryError(start);
}

function normalizeAbsolute(p: string): string {
  // Collapse a trailing slash (except the root) so the parent