Function makeShim

test/gstack-gbrain-sync.test.ts:565–581

* Build a gbrain shim that responds to specific subcommands with canned * output, then return PATH-prepend value. Lets us run helpers in-process * (which spawn `gbrain` from PATH) without a real gbrain CLI.

(bindir: string, responses: Record<string, { stdout?: string; stderr?: string; exit?: number }>)

 * (which spawn `gbrain` from PATH) without a real gbrain CLI.
 */
function makeShim(bindir: string, responses: Record<string, { stdout?: string; stderr?: string; exit?: number }>): string {
  const shim = join(bindir, "gbrain");
  const cases = Object.entries(responses).map(([key, r]) => {
    const exit = r.exit ?? 0;
    const stdout = (r.stdout || "").replace(/'/g, "'\\''");
    const stderr = (r.stderr || "").replace(/'/g, "'\\''");
    // Patterns with spaces MUST be double-quoted in sh case statements,
    // otherwise the shell parses the second word as the start of the next
    // pattern and errors out.
    return `  "${key}") printf '%s' '${stdout}'; printf '%s' '${stderr}' >&2; exit ${exit} ;;`;
  }).join("\n");
  // Match on the full argument string, joined with literal spaces.
  const script = `#!/bin/sh\nARGS="$*"\ncase "$ARGS" in\n${cases}\n  *) echo "shim: no match for [$ARGS]" >&2; exit 1 ;;\nesac\n`;
  writeFileSync(shim, script);
  chmodSync(shim, 0o755);
  return shim;
}

describe("derivePathOnlyHashLegacyId", () => {
  it("returns the pre-#1468 form (path-only sha1, no hostname)", () => {